1 /* GStreamer
2 * Copyright (C) 2008 Nokia Corporation. All rights reserved.
3 * Contact: Stefan Kost <stefan.kost@nokia.com>
4 * Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
5 * Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
6 * Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
22 */
23
24 /**
25 * SECTION:gstbaseparse
26 * @title: GstBaseParse
27 * @short_description: Base class for stream parsers
28 * @see_also: #GstBaseTransform
29 *
30 * This base class is for parser elements that process data and splits it
31 * into separate audio/video/whatever frames.
32 *
33 * It provides for:
34 *
35 * * provides one sink pad and one source pad
36 * * handles state changes
37 * * can operate in pull mode or push mode
38 * * handles seeking in both modes
39 * * handles events (SEGMENT/EOS/FLUSH)
40 * * handles queries (POSITION/DURATION/SEEKING/FORMAT/CONVERT)
41 * * handles flushing
42 *
43 * The purpose of this base class is to provide the basic functionality of
44 * a parser and share a lot of rather complex code.
45 *
46 * # Description of the parsing mechanism:
47 *
48 * ## Set-up phase
49 *
50 * * #GstBaseParse calls #GstBaseParseClass.start() to inform subclass
51 * that data processing is about to start now.
52 *
53 * * #GstBaseParse class calls #GstBaseParseClass.set_sink_caps() to
54 * inform the subclass about incoming sinkpad caps. Subclass could
55 * already set the srcpad caps accordingly, but this might be delayed
56 * until calling gst_base_parse_finish_frame() with a non-queued frame.
57 *
58 * * At least at this point subclass needs to tell the #GstBaseParse class
59 * how big data chunks it wants to receive (minimum frame size ). It can
60 * do this with gst_base_parse_set_min_frame_size().
61 *
62 * * #GstBaseParse class sets up appropriate data passing mode (pull/push)
63 * and starts to process the data.
64 *
65 * ## Parsing phase
66 *
67 * * #GstBaseParse gathers at least min_frame_size bytes of data either
68 * by pulling it from upstream or collecting buffers in an internal
69 * #GstAdapter.
70 *
71 * * A buffer of (at least) min_frame_size bytes is passed to subclass
72 * with #GstBaseParseClass.handle_frame(). Subclass checks the contents
73 * and can optionally return #GST_FLOW_OK along with an amount of data
74 * to be skipped to find a valid frame (which will result in a
75 * subsequent DISCONT). If, otherwise, the buffer does not hold a
76 * complete frame, #GstBaseParseClass.handle_frame() can merely return
77 * and will be called again when additional data is available. In push
78 * mode this amounts to an additional input buffer (thus minimal
79 * additional latency), in pull mode this amounts to some arbitrary
80 * reasonable buffer size increase.
81 *
82 * Of course, gst_base_parse_set_min_frame_size() could also be used if
83 * a very specific known amount of additional data is required. If,
84 * however, the buffer holds a complete valid frame, it can pass the
85 * size of this frame to gst_base_parse_finish_frame().
86 *
87 * If acting as a converter, it can also merely indicate consumed input
88 * data while simultaneously providing custom output data. Note that
89 * baseclass performs some processing (such as tracking overall consumed
90 * data rate versus duration) for each finished frame, but other state
91 * is only updated upon each call to #GstBaseParseClass.handle_frame()
92 * (such as tracking upstream input timestamp).
93 *
94 * Subclass is also responsible for setting the buffer metadata
95 * (e.g. buffer timestamp and duration, or keyframe if applicable).
96 * (although the latter can also be done by #GstBaseParse if it is
97 * appropriately configured, see below). Frame is provided with
98 * timestamp derived from upstream (as much as generally possible),
99 * duration obtained from configuration (see below), and offset
100 * if meaningful (in pull mode).
101 *
102 * Note that #GstBaseParseClass.handle_frame() might receive any small
103 * amount of input data when leftover data is being drained (e.g. at
104 * EOS).
105 *
106 * * As part of finish frame processing, just prior to actually pushing
107 * the buffer in question, it is passed to
108 * #GstBaseParseClass.pre_push_frame() which gives subclass yet one last
109 * chance to examine buffer metadata, or to send some custom (tag)
110 * events, or to perform custom (segment) filtering.
111 *
112 * * During the parsing process #GstBaseParseClass will handle both srcpad
113 * and sinkpad events. They will be passed to subclass if
114 * #GstBaseParseClass.event() or #GstBaseParseClass.src_event()
115 * implementations have been provided.
116 *
117 * ## Shutdown phase
118 *
119 * * #GstBaseParse class calls #GstBaseParseClass.stop() to inform the
120 * subclass that data parsing will be stopped.
121 *
122 * Subclass is responsible for providing pad template caps for source and
123 * sink pads. The pads need to be named "sink" and "src". It also needs to
124 * set the fixed caps on srcpad, when the format is ensured (e.g. when
125 * base class calls subclass' #GstBaseParseClass.set_sink_caps() function).
126 *
127 * This base class uses %GST_FORMAT_DEFAULT as a meaning of frames. So,
128 * subclass conversion routine needs to know that conversion from
129 * %GST_FORMAT_TIME to %GST_FORMAT_DEFAULT must return the
130 * frame number that can be found from the given byte position.
131 *
132 * #GstBaseParse uses subclasses conversion methods also for seeking (or
133 * otherwise uses its own default one, see also below).
134 *
135 * Subclass @start and @stop functions will be called to inform the beginning
136 * and end of data processing.
137 *
138 * Things that subclass need to take care of:
139 *
140 * * Provide pad templates
141 * * Fixate the source pad caps when appropriate
142 * * Inform base class how big data chunks should be retrieved. This is
143 * done with gst_base_parse_set_min_frame_size() function.
144 * * Examine data chunks passed to subclass with
145 * #GstBaseParseClass.handle_frame() and pass proper frame(s) to
146 * gst_base_parse_finish_frame(), and setting src pad caps and timestamps
147 * on frame.
148 * * Provide conversion functions
149 * * Update the duration information with gst_base_parse_set_duration()
150 * * Optionally passthrough using gst_base_parse_set_passthrough()
151 * * Configure various baseparse parameters using
152 * gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
153 * and gst_base_parse_set_frame_rate().
154 *
155 * * In particular, if subclass is unable to determine a duration, but
156 * parsing (or specs) yields a frames per seconds rate, then this can be
157 * provided to #GstBaseParse to enable it to cater for buffer time
158 * metadata (which will be taken from upstream as much as
159 * possible). Internally keeping track of frame durations and respective
160 * sizes that have been pushed provides #GstBaseParse with an estimated
161 * bitrate. A default #GstBaseParseClass.convert() (used if not
162 * overridden) will then use these rates to perform obvious conversions.
163 * These rates are also used to update (estimated) duration at regular
164 * frame intervals.
165 *
166 */
167
168 /* TODO:
169 * - In push mode provide a queue of adapter-"queued" buffers for upstream
170 * buffer metadata
171 * - Queue buffers/events until caps are set
172 */
173
174 #ifdef HAVE_CONFIG_H
175 # include "config.h"
176 #endif
177
178 #include <stdlib.h>
179 #include <string.h>
180
181 #include <gst/base/gstadapter.h>
182
183 #include "gstbaseparse.h"
184
185 /* FIXME: get rid of old GstIndex code */
186 #include "gstindex.h"
187 #include "gstindex.c"
188 #include "gstmemindex.c"
189
190 #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
191
192 #define MIN_FRAMES_TO_POST_BITRATE 10
193 #define TARGET_DIFFERENCE (20 * GST_SECOND)
194 #define MAX_INDEX_ENTRIES 4096
195 #define UPDATE_THRESHOLD 2
196
197 #define ABSDIFF(a,b) (((a) > (b)) ? ((a) - (b)) : ((b) - (a)))
198
199 GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
200 #define GST_CAT_DEFAULT gst_base_parse_debug
201
202 /* Supported formats */
203 static const GstFormat fmtlist[] = {
204 GST_FORMAT_DEFAULT,
205 GST_FORMAT_BYTES,
206 GST_FORMAT_TIME,
207 GST_FORMAT_UNDEFINED
208 };
209
210 struct _GstBaseParsePrivate
211 {
212 GstPadMode pad_mode;
213
214 GstAdapter *adapter;
215
216 gint64 duration;
217 GstFormat duration_fmt;
218 gint64 estimated_duration;
219 gint64 estimated_drift;
220
221 guint min_frame_size;
222 gboolean disable_passthrough;
223 gboolean passthrough;
224 gboolean pts_interpolate;
225 gboolean infer_ts;
226 gboolean syncable;
227 gboolean has_timing_info;
228 guint fps_num, fps_den;
229 gint update_interval;
230 guint bitrate;
231 guint lead_in, lead_out;
232 GstClockTime lead_in_ts, lead_out_ts;
233 GstClockTime min_latency, max_latency;
234
235 gboolean discont;
236 gboolean flushing;
237 gboolean drain;
238 gboolean saw_gaps;
239
240 gint64 offset;
241 gint64 sync_offset;
242 GstClockTime next_pts;
243 GstClockTime next_dts;
244 GstClockTime prev_pts;
245 GstClockTime prev_dts;
246 gboolean prev_dts_from_pts;
247 GstClockTime frame_duration;
248 gboolean seen_keyframe;
249 gboolean is_video;
250 gint flushed;
251
252 guint64 framecount;
253 guint64 bytecount;
254 guint64 data_bytecount;
255 guint64 acc_duration;
256 GstClockTime first_frame_pts;
257 GstClockTime first_frame_dts;
258 gint64 first_frame_offset;
259
260 gboolean post_min_bitrate;
261 gboolean post_avg_bitrate;
262 gboolean post_max_bitrate;
263
264 guint min_bitrate;
265 guint avg_bitrate;
266 guint max_bitrate;
267 guint posted_avg_bitrate;
268
269 /* frames/buffers that are queued and ready to go on OK */
270 GQueue queued_frames;
271
272 GstBuffer *cache;
273
274 /* index entry storage, either ours or provided */
275 GstIndex *index;
276 gint index_id;
277 gboolean own_index;
278 GMutex index_lock;
279
280 /* seek table entries only maintained if upstream is BYTE seekable */
281 gboolean upstream_seekable;
282 gboolean upstream_has_duration;
283 gint64 upstream_size;
284 GstFormat upstream_format;
285 /* minimum distance between two index entries */
286 GstClockTimeDiff idx_interval;
287 guint64 idx_byte_interval;
288 /* ts and offset of last entry added */
289 GstClockTime index_last_ts;
290 gint64 index_last_offset;
291 gboolean index_last_valid;
292
293 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
294 gboolean exact_position;
295 /* seek events are temporarily kept to match them with newsegments */
296 GSList *pending_seeks;
297
298 /* reverse playback */
299 GSList *buffers_pending;
300 GSList *buffers_head;
301 GSList *buffers_queued;
302 GSList *buffers_send;
303 GstClockTime last_pts;
304 GstClockTime last_dts;
305 gint64 last_offset;
306
307 /* Pending serialized events */
308 GList *pending_events;
309
310 /* If baseparse has checked the caps to identify if it is
311 * handling video or audio */
312 gboolean checked_media;
313
314 /* offset of last parsed frame/data */
315 gint64 prev_offset;
316 /* force a new frame, regardless of offset */
317 gboolean new_frame;
318 /* whether we are merely scanning for a frame */
319 gboolean scanning;
320 /* ... and resulting frame, if any */
321 GstBaseParseFrame *scanned_frame;
322
323 /* TRUE if we're still detecting the format, i.e.
324 * if ::detect() is still called for future buffers */
325 gboolean detecting;
326 GList *detect_buffers;
327 guint detect_buffers_size;
328
329 /* True when no buffers have been received yet */
330 gboolean first_buffer;
331
332 /* if TRUE, a STREAM_START event needs to be pushed */
333 gboolean push_stream_start;
334
335 /* When we need to skip more data than we have currently */
336 guint skip;
337
338 /* Tag handling (stream tags only, global tags are passed through as-is) */
339 GstTagList *upstream_tags;
340 GstTagList *parser_tags;
341 GstTagMergeMode parser_tags_merge_mode;
342 gboolean tags_changed;
343
344 /* Current segment seqnum */
345 guint32 segment_seqnum;
346 };
347
348 typedef struct _GstBaseParseSeek
349 {
350 GstSegment segment;
351 gboolean accurate;
352 gint64 offset;
353 GstClockTime start_ts;
354 } GstBaseParseSeek;
355
356 #define DEFAULT_DISABLE_PASSTHROUGH FALSE
357
358 enum
359 {
360 PROP_0,
361 PROP_DISABLE_PASSTHROUGH,
362 PROP_LAST
363 };
364
365 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
366 g_mutex_lock (&parse->priv->index_lock);
367 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
368 g_mutex_unlock (&parse->priv->index_lock);
369
370 static GstElementClass *parent_class = NULL;
371 static gint base_parse_private_offset = 0;
372
373 static void gst_base_parse_class_init (GstBaseParseClass * klass);
374 static void gst_base_parse_init (GstBaseParse * parse,
375 GstBaseParseClass * klass);
376
377 GType
gst_base_parse_get_type(void)378 gst_base_parse_get_type (void)
379 {
380 static volatile gsize base_parse_type = 0;
381
382 if (g_once_init_enter (&base_parse_type)) {
383 static const GTypeInfo base_parse_info = {
384 sizeof (GstBaseParseClass),
385 (GBaseInitFunc) NULL,
386 (GBaseFinalizeFunc) NULL,
387 (GClassInitFunc) gst_base_parse_class_init,
388 NULL,
389 NULL,
390 sizeof (GstBaseParse),
391 0,
392 (GInstanceInitFunc) gst_base_parse_init,
393 };
394 GType _type;
395
396 _type = g_type_register_static (GST_TYPE_ELEMENT,
397 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
398
399 base_parse_private_offset =
400 g_type_add_instance_private (_type, sizeof (GstBaseParsePrivate));
401
402 g_once_init_leave (&base_parse_type, _type);
403 }
404 return (GType) base_parse_type;
405 }
406
407 static inline GstBaseParsePrivate *
gst_base_parse_get_instance_private(GstBaseParse * self)408 gst_base_parse_get_instance_private (GstBaseParse * self)
409 {
410 return (G_STRUCT_MEMBER_P (self, base_parse_private_offset));
411 }
412
413 static void gst_base_parse_finalize (GObject * object);
414
415 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
416 GstStateChange transition);
417 static void gst_base_parse_reset (GstBaseParse * parse);
418
419 #if 0
420 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
421 static GstIndex *gst_base_parse_get_index (GstElement * element);
422 #endif
423
424 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
425 GstObject * parent);
426 static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
427 GstObject * parent, GstPadMode mode, gboolean active);
428 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
429 GstEvent * event);
430 static void gst_base_parse_set_upstream_tags (GstBaseParse * parse,
431 GstTagList * taglist);
432
433 static void gst_base_parse_set_property (GObject * object, guint prop_id,
434 const GValue * value, GParamSpec * pspec);
435 static void gst_base_parse_get_property (GObject * object, guint prop_id,
436 GValue * value, GParamSpec * pspec);
437
438 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
439 GstEvent * event);
440 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
441 GstQuery * query);
442
443 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
444 GstEvent * event);
445 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
446 GstQuery * query);
447
448 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
449 GstBuffer * buffer);
450 static void gst_base_parse_loop (GstPad * pad);
451
452 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
453 GstBaseParseFrame * frame);
454
455 static gboolean gst_base_parse_sink_event_default (GstBaseParse * parse,
456 GstEvent * event);
457
458 static gboolean gst_base_parse_src_event_default (GstBaseParse * parse,
459 GstEvent * event);
460
461 static gboolean gst_base_parse_sink_query_default (GstBaseParse * parse,
462 GstQuery * query);
463 static gboolean gst_base_parse_src_query_default (GstBaseParse * parse,
464 GstQuery * query);
465
466 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
467 GstClockTime time, gboolean before, GstClockTime * _ts);
468 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
469 GstClockTime * _time, gint64 * _offset);
470
471 static GstFlowReturn gst_base_parse_start_fragment (GstBaseParse * parse);
472 static GstFlowReturn gst_base_parse_finish_fragment (GstBaseParse * parse,
473 gboolean prev_head);
474 static GstFlowReturn gst_base_parse_send_buffers (GstBaseParse * parse);
475
476 static inline GstFlowReturn gst_base_parse_check_sync (GstBaseParse * parse);
477
478 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
479
480 static void gst_base_parse_push_pending_events (GstBaseParse * parse);
481
482 static void
gst_base_parse_clear_queues(GstBaseParse * parse)483 gst_base_parse_clear_queues (GstBaseParse * parse)
484 {
485 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
486 g_slist_free (parse->priv->buffers_queued);
487 parse->priv->buffers_queued = NULL;
488 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
489 NULL);
490 g_slist_free (parse->priv->buffers_pending);
491 parse->priv->buffers_pending = NULL;
492 g_slist_foreach (parse->priv->buffers_head, (GFunc) gst_buffer_unref, NULL);
493 g_slist_free (parse->priv->buffers_head);
494 parse->priv->buffers_head = NULL;
495 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
496 g_slist_free (parse->priv->buffers_send);
497 parse->priv->buffers_send = NULL;
498
499 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
500 g_list_free (parse->priv->detect_buffers);
501 parse->priv->detect_buffers = NULL;
502 parse->priv->detect_buffers_size = 0;
503
504 g_queue_foreach (&parse->priv->queued_frames,
505 (GFunc) gst_base_parse_frame_free, NULL);
506 g_queue_clear (&parse->priv->queued_frames);
507
508 gst_buffer_replace (&parse->priv->cache, NULL);
509
510 g_list_foreach (parse->priv->pending_events, (GFunc) gst_event_unref, NULL);
511 g_list_free (parse->priv->pending_events);
512 parse->priv->pending_events = NULL;
513
514 parse->priv->checked_media = FALSE;
515 }
516
517 static void
gst_base_parse_finalize(GObject * object)518 gst_base_parse_finalize (GObject * object)
519 {
520 GstBaseParse *parse = GST_BASE_PARSE (object);
521
522 g_object_unref (parse->priv->adapter);
523
524 if (parse->priv->index) {
525 gst_object_unref (parse->priv->index);
526 parse->priv->index = NULL;
527 }
528 g_mutex_clear (&parse->priv->index_lock);
529
530 gst_base_parse_clear_queues (parse);
531
532 G_OBJECT_CLASS (parent_class)->finalize (object);
533 }
534
535 static void
gst_base_parse_class_init(GstBaseParseClass * klass)536 gst_base_parse_class_init (GstBaseParseClass * klass)
537 {
538 GObjectClass *gobject_class;
539 GstElementClass *gstelement_class;
540
541 gobject_class = G_OBJECT_CLASS (klass);
542
543 if (base_parse_private_offset != 0)
544 g_type_class_adjust_private_offset (klass, &base_parse_private_offset);
545
546 parent_class = g_type_class_peek_parent (klass);
547
548 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
549 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_base_parse_set_property);
550 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_base_parse_get_property);
551
552 /**
553 * GstBaseParse:disable-passthrough:
554 *
555 * If set to %TRUE, baseparse will unconditionally force parsing of the
556 * incoming data. This can be required in the rare cases where the incoming
557 * side-data (caps, pts, dts, ...) is not trusted by the user and wants to
558 * force validation and parsing of the incoming data.
559 * If set to %FALSE, decision of whether to parse the data or not is up to
560 * the implementation (standard behaviour).
561 */
562 g_object_class_install_property (gobject_class, PROP_DISABLE_PASSTHROUGH,
563 g_param_spec_boolean ("disable-passthrough", "Disable passthrough",
564 "Force processing (disables passthrough)",
565 DEFAULT_DISABLE_PASSTHROUGH,
566 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
567
568 gstelement_class = (GstElementClass *) klass;
569 gstelement_class->change_state =
570 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
571
572 #if 0
573 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
574 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
575 #endif
576
577 /* Default handlers */
578 klass->sink_event = gst_base_parse_sink_event_default;
579 klass->src_event = gst_base_parse_src_event_default;
580 klass->sink_query = gst_base_parse_sink_query_default;
581 klass->src_query = gst_base_parse_src_query_default;
582 klass->convert = gst_base_parse_convert_default;
583
584 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
585 "baseparse element");
586 }
587
588 static void
gst_base_parse_init(GstBaseParse * parse,GstBaseParseClass * bclass)589 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
590 {
591 GstPadTemplate *pad_template;
592
593 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
594
595 parse->priv = gst_base_parse_get_instance_private (parse);
596
597 pad_template =
598 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
599 g_return_if_fail (pad_template != NULL);
600 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
601 gst_pad_set_event_function (parse->sinkpad,
602 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
603 gst_pad_set_query_function (parse->sinkpad,
604 GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
605 gst_pad_set_chain_function (parse->sinkpad,
606 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
607 gst_pad_set_activate_function (parse->sinkpad,
608 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
609 gst_pad_set_activatemode_function (parse->sinkpad,
610 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
611 GST_PAD_SET_PROXY_ALLOCATION (parse->sinkpad);
612 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
613
614 GST_DEBUG_OBJECT (parse, "sinkpad created");
615
616 pad_template =
617 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
618 g_return_if_fail (pad_template != NULL);
619 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
620 gst_pad_set_event_function (parse->srcpad,
621 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
622 gst_pad_set_query_function (parse->srcpad,
623 GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
624 gst_pad_use_fixed_caps (parse->srcpad);
625 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
626 GST_DEBUG_OBJECT (parse, "src created");
627
628 g_queue_init (&parse->priv->queued_frames);
629
630 parse->priv->adapter = gst_adapter_new ();
631
632 parse->priv->pad_mode = GST_PAD_MODE_NONE;
633
634 g_mutex_init (&parse->priv->index_lock);
635
636 /* init state */
637 gst_base_parse_reset (parse);
638 GST_DEBUG_OBJECT (parse, "init ok");
639
640 GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE);
641
642 parse->priv->upstream_tags = NULL;
643 parse->priv->parser_tags = NULL;
644 parse->priv->parser_tags_merge_mode = GST_TAG_MERGE_APPEND;
645 parse->priv->disable_passthrough = DEFAULT_DISABLE_PASSTHROUGH;
646 }
647
648 static void
gst_base_parse_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)649 gst_base_parse_set_property (GObject * object, guint prop_id,
650 const GValue * value, GParamSpec * pspec)
651 {
652 GstBaseParse *parse = GST_BASE_PARSE (object);
653
654 switch (prop_id) {
655 case PROP_DISABLE_PASSTHROUGH:
656 parse->priv->disable_passthrough = g_value_get_boolean (value);
657 break;
658 default:
659 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
660 break;
661 }
662 }
663
664 static void
gst_base_parse_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)665 gst_base_parse_get_property (GObject * object, guint prop_id, GValue * value,
666 GParamSpec * pspec)
667 {
668 GstBaseParse *parse = GST_BASE_PARSE (object);
669
670 switch (prop_id) {
671 case PROP_DISABLE_PASSTHROUGH:
672 g_value_set_boolean (value, parse->priv->disable_passthrough);
673 break;
674 default:
675 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
676 break;
677 }
678 }
679
680 /**
681 * gst_base_parse_frame_copy:
682 * @frame: a #GstBaseParseFrame
683 *
684 * Copies a #GstBaseParseFrame.
685 *
686 * Returns: A copy of @frame
687 */
688
689 GstBaseParseFrame *
gst_base_parse_frame_copy(GstBaseParseFrame * frame)690 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
691 {
692 GstBaseParseFrame *copy;
693
694 copy = g_slice_dup (GstBaseParseFrame, frame);
695 copy->buffer = gst_buffer_ref (frame->buffer);
696 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
697
698 GST_TRACE ("copied frame %p -> %p", frame, copy);
699
700 return copy;
701 }
702
703 /**
704 * gst_base_parse_frame_free:
705 * @frame: A #GstBaseParseFrame
706 *
707 * Frees the provided @frame.
708 */
709 void
gst_base_parse_frame_free(GstBaseParseFrame * frame)710 gst_base_parse_frame_free (GstBaseParseFrame * frame)
711 {
712 GST_TRACE ("freeing frame %p", frame);
713
714 if (frame->buffer) {
715 gst_buffer_unref (frame->buffer);
716 frame->buffer = NULL;
717 }
718
719 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
720 g_slice_free (GstBaseParseFrame, frame);
721 } else {
722 memset (frame, 0, sizeof (*frame));
723 }
724 }
725
726 G_DEFINE_BOXED_TYPE (GstBaseParseFrame, gst_base_parse_frame,
727 (GBoxedCopyFunc) gst_base_parse_frame_copy,
728 (GBoxedFreeFunc) gst_base_parse_frame_free);
729
730 /**
731 * gst_base_parse_frame_init:
732 * @frame: #GstBaseParseFrame.
733 *
734 * Sets a #GstBaseParseFrame to initial state. Currently this means
735 * all public fields are zero-ed and a private flag is set to make
736 * sure gst_base_parse_frame_free() only frees the contents but not
737 * the actual frame. Use this function to initialise a #GstBaseParseFrame
738 * allocated on the stack.
739 */
740 void
gst_base_parse_frame_init(GstBaseParseFrame * frame)741 gst_base_parse_frame_init (GstBaseParseFrame * frame)
742 {
743 memset (frame, 0, sizeof (GstBaseParseFrame));
744 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
745 GST_TRACE ("inited frame %p", frame);
746 }
747
748 /**
749 * gst_base_parse_frame_new:
750 * @buffer: (transfer none): a #GstBuffer
751 * @flags: the flags
752 * @overhead: number of bytes in this frame which should be counted as
753 * metadata overhead, ie. not used to calculate the average bitrate.
754 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
755 *
756 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
757 * elements written in C should usually allocate the frame on the stack and
758 * then use gst_base_parse_frame_init() to initialise it.
759 *
760 * Returns: a newly-allocated #GstBaseParseFrame. Free with
761 * gst_base_parse_frame_free() when no longer needed.
762 */
763 GstBaseParseFrame *
gst_base_parse_frame_new(GstBuffer * buffer,GstBaseParseFrameFlags flags,gint overhead)764 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
765 gint overhead)
766 {
767 GstBaseParseFrame *frame;
768
769 frame = g_slice_new0 (GstBaseParseFrame);
770 frame->buffer = gst_buffer_ref (buffer);
771
772 GST_TRACE ("created frame %p", frame);
773 return frame;
774 }
775
776 static inline void
gst_base_parse_update_flags(GstBaseParse * parse)777 gst_base_parse_update_flags (GstBaseParse * parse)
778 {
779 parse->flags = 0;
780
781 /* set flags one by one for clarity */
782 if (G_UNLIKELY (parse->priv->drain))
783 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
784
785 /* losing sync is pretty much a discont (and vice versa), no ? */
786 if (G_UNLIKELY (parse->priv->discont))
787 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
788 }
789
790 static inline void
gst_base_parse_update_frame(GstBaseParse * parse,GstBaseParseFrame * frame)791 gst_base_parse_update_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
792 {
793 if (G_UNLIKELY (parse->priv->discont)) {
794 GST_DEBUG_OBJECT (parse, "marking DISCONT");
795 GST_BUFFER_FLAG_SET (frame->buffer, GST_BUFFER_FLAG_DISCONT);
796 } else {
797 GST_BUFFER_FLAG_UNSET (frame->buffer, GST_BUFFER_FLAG_DISCONT);
798 }
799
800 if (parse->priv->prev_offset != parse->priv->offset || parse->priv->new_frame) {
801 GST_LOG_OBJECT (parse, "marking as new frame");
802 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME;
803 }
804
805 frame->offset = parse->priv->prev_offset = parse->priv->offset;
806 }
807
808 static void
gst_base_parse_reset(GstBaseParse * parse)809 gst_base_parse_reset (GstBaseParse * parse)
810 {
811 GST_OBJECT_LOCK (parse);
812 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
813 parse->priv->duration = -1;
814 parse->priv->min_frame_size = 1;
815 parse->priv->discont = TRUE;
816 parse->priv->flushing = FALSE;
817 parse->priv->saw_gaps = FALSE;
818 parse->priv->offset = 0;
819 parse->priv->sync_offset = 0;
820 parse->priv->update_interval = -1;
821 parse->priv->fps_num = parse->priv->fps_den = 0;
822 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
823 parse->priv->lead_in = parse->priv->lead_out = 0;
824 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
825 parse->priv->bitrate = 0;
826 parse->priv->framecount = 0;
827 parse->priv->bytecount = 0;
828 parse->priv->acc_duration = 0;
829 parse->priv->first_frame_pts = GST_CLOCK_TIME_NONE;
830 parse->priv->first_frame_dts = GST_CLOCK_TIME_NONE;
831 parse->priv->first_frame_offset = -1;
832 parse->priv->estimated_duration = -1;
833 parse->priv->estimated_drift = 0;
834 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
835 parse->priv->next_dts = 0;
836 parse->priv->syncable = TRUE;
837 parse->priv->passthrough = FALSE;
838 parse->priv->pts_interpolate = TRUE;
839 parse->priv->infer_ts = TRUE;
840 parse->priv->has_timing_info = FALSE;
841 parse->priv->min_bitrate = G_MAXUINT;
842 parse->priv->max_bitrate = 0;
843 parse->priv->avg_bitrate = 0;
844 parse->priv->posted_avg_bitrate = 0;
845
846 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
847 parse->priv->index_last_offset = -1;
848 parse->priv->index_last_valid = TRUE;
849 parse->priv->upstream_seekable = FALSE;
850 parse->priv->upstream_size = 0;
851 parse->priv->upstream_has_duration = FALSE;
852 parse->priv->upstream_format = GST_FORMAT_UNDEFINED;
853 parse->priv->idx_interval = 0;
854 parse->priv->idx_byte_interval = 0;
855 parse->priv->exact_position = TRUE;
856 parse->priv->seen_keyframe = FALSE;
857 parse->priv->checked_media = FALSE;
858
859 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
860 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
861 parse->priv->last_offset = 0;
862
863 parse->priv->skip = 0;
864
865 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
866 NULL);
867 g_list_free (parse->priv->pending_events);
868 parse->priv->pending_events = NULL;
869
870 if (parse->priv->cache) {
871 gst_buffer_unref (parse->priv->cache);
872 parse->priv->cache = NULL;
873 }
874
875 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
876 g_slist_free (parse->priv->pending_seeks);
877 parse->priv->pending_seeks = NULL;
878
879 if (parse->priv->adapter)
880 gst_adapter_clear (parse->priv->adapter);
881
882 gst_base_parse_set_upstream_tags (parse, NULL);
883
884 if (parse->priv->parser_tags) {
885 gst_tag_list_unref (parse->priv->parser_tags);
886 parse->priv->parser_tags = NULL;
887 }
888 parse->priv->parser_tags_merge_mode = GST_TAG_MERGE_APPEND;
889
890 parse->priv->new_frame = TRUE;
891
892 parse->priv->first_buffer = TRUE;
893
894 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
895 g_list_free (parse->priv->detect_buffers);
896 parse->priv->detect_buffers = NULL;
897 parse->priv->detect_buffers_size = 0;
898
899 parse->priv->segment_seqnum = GST_SEQNUM_INVALID;
900 GST_OBJECT_UNLOCK (parse);
901 }
902
903 static gboolean
gst_base_parse_check_bitrate_tag(GstBaseParse * parse,const gchar * tag)904 gst_base_parse_check_bitrate_tag (GstBaseParse * parse, const gchar * tag)
905 {
906 gboolean got_tag = FALSE;
907 guint n = 0;
908
909 if (parse->priv->upstream_tags != NULL)
910 got_tag = gst_tag_list_get_uint (parse->priv->upstream_tags, tag, &n);
911
912 if (!got_tag && parse->priv->parser_tags != NULL)
913 got_tag = gst_tag_list_get_uint (parse->priv->parser_tags, tag, &n);
914
915 return got_tag;
916 }
917
918 /* check if upstream or subclass tags contain bitrates already */
919 static void
gst_base_parse_check_bitrate_tags(GstBaseParse * parse)920 gst_base_parse_check_bitrate_tags (GstBaseParse * parse)
921 {
922 parse->priv->post_min_bitrate =
923 !gst_base_parse_check_bitrate_tag (parse, GST_TAG_MINIMUM_BITRATE);
924 parse->priv->post_avg_bitrate =
925 !gst_base_parse_check_bitrate_tag (parse, GST_TAG_BITRATE);
926 parse->priv->post_max_bitrate =
927 !gst_base_parse_check_bitrate_tag (parse, GST_TAG_MAXIMUM_BITRATE);
928 }
929
930 /* Queues new tag event with the current combined state of the stream tags
931 * (i.e. upstream tags merged with subclass tags and current baseparse tags) */
932 static void
gst_base_parse_queue_tag_event_update(GstBaseParse * parse)933 gst_base_parse_queue_tag_event_update (GstBaseParse * parse)
934 {
935 GstTagList *merged_tags;
936
937 GST_LOG_OBJECT (parse, "upstream : %" GST_PTR_FORMAT,
938 parse->priv->upstream_tags);
939 GST_LOG_OBJECT (parse, "parser : %" GST_PTR_FORMAT,
940 parse->priv->parser_tags);
941 GST_LOG_OBJECT (parse, "mode : %d", parse->priv->parser_tags_merge_mode);
942
943 merged_tags =
944 gst_tag_list_merge (parse->priv->upstream_tags, parse->priv->parser_tags,
945 parse->priv->parser_tags_merge_mode);
946
947 GST_DEBUG_OBJECT (parse, "merged : %" GST_PTR_FORMAT, merged_tags);
948
949 if (merged_tags == NULL)
950 return;
951
952 if (gst_tag_list_is_empty (merged_tags)) {
953 gst_tag_list_unref (merged_tags);
954 return;
955 }
956
957 if (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE) {
958 /* only add bitrate tags to non-empty taglists for now, and only if neither
959 * upstream tags nor the subclass sets the bitrate tag in question already */
960 if (parse->priv->min_bitrate != G_MAXUINT && parse->priv->post_min_bitrate) {
961 GST_LOG_OBJECT (parse, "adding min bitrate %u", parse->priv->min_bitrate);
962 gst_tag_list_add (merged_tags, GST_TAG_MERGE_KEEP,
963 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
964 }
965 if (parse->priv->max_bitrate != 0 && parse->priv->post_max_bitrate) {
966 GST_LOG_OBJECT (parse, "adding max bitrate %u", parse->priv->max_bitrate);
967 gst_tag_list_add (merged_tags, GST_TAG_MERGE_KEEP,
968 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
969 }
970 if (parse->priv->avg_bitrate != 0 && parse->priv->post_avg_bitrate) {
971 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
972 GST_LOG_OBJECT (parse, "adding avg bitrate %u", parse->priv->avg_bitrate);
973 gst_tag_list_add (merged_tags, GST_TAG_MERGE_KEEP,
974 GST_TAG_BITRATE, parse->priv->avg_bitrate, NULL);
975 }
976 }
977
978 parse->priv->pending_events =
979 g_list_prepend (parse->priv->pending_events,
980 gst_event_new_tag (merged_tags));
981 }
982
983 /* gst_base_parse_parse_frame:
984 * @parse: #GstBaseParse.
985 * @buffer: #GstBuffer.
986 *
987 * Default callback for parse_frame.
988 */
989 static GstFlowReturn
gst_base_parse_parse_frame(GstBaseParse * parse,GstBaseParseFrame * frame)990 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
991 {
992 GstBuffer *buffer = frame->buffer;
993
994 if (!GST_BUFFER_PTS_IS_VALID (buffer) &&
995 GST_CLOCK_TIME_IS_VALID (parse->priv->next_pts)) {
996 GST_BUFFER_PTS (buffer) = parse->priv->next_pts;
997 }
998 if (!GST_BUFFER_DTS_IS_VALID (buffer) &&
999 GST_CLOCK_TIME_IS_VALID (parse->priv->next_dts)) {
1000 GST_BUFFER_DTS (buffer) = parse->priv->next_dts;
1001 }
1002 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
1003 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
1004 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
1005 }
1006 return GST_FLOW_OK;
1007 }
1008
1009 /* gst_base_parse_convert:
1010 * @parse: #GstBaseParse.
1011 * @src_format: #GstFormat describing the source format.
1012 * @src_value: Source value to be converted.
1013 * @dest_format: #GstFormat defining the converted format.
1014 * @dest_value: Pointer where the conversion result will be put.
1015 *
1016 * Converts using configured "convert" vmethod in #GstBaseParse class.
1017 *
1018 * Returns: %TRUE if conversion was successful.
1019 */
1020 static gboolean
gst_base_parse_convert(GstBaseParse * parse,GstFormat src_format,gint64 src_value,GstFormat dest_format,gint64 * dest_value)1021 gst_base_parse_convert (GstBaseParse * parse,
1022 GstFormat src_format,
1023 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1024 {
1025 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1026 gboolean ret;
1027
1028 g_return_val_if_fail (dest_value != NULL, FALSE);
1029
1030 if (!klass->convert)
1031 return FALSE;
1032
1033 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
1034
1035 #ifndef GST_DISABLE_GST_DEBUG
1036 {
1037 if (ret) {
1038 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
1039 GST_LOG_OBJECT (parse,
1040 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
1041 GST_TIME_ARGS (src_value), *dest_value);
1042 } else if (dest_format == GST_FORMAT_TIME &&
1043 src_format == GST_FORMAT_BYTES) {
1044 GST_LOG_OBJECT (parse,
1045 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
1046 src_value, GST_TIME_ARGS (*dest_value));
1047 } else {
1048 GST_LOG_OBJECT (parse,
1049 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
1050 GST_STR_NULL (gst_format_get_name (src_format)),
1051 GST_STR_NULL (gst_format_get_name (dest_format)),
1052 src_value, *dest_value);
1053 }
1054 } else {
1055 GST_DEBUG_OBJECT (parse, "conversion failed");
1056 }
1057 }
1058 #endif
1059
1060 return ret;
1061 }
1062
1063 static gboolean
update_upstream_provided(GQuark field_id,const GValue * value,gpointer user_data)1064 update_upstream_provided (GQuark field_id, const GValue * value,
1065 gpointer user_data)
1066 {
1067 GstCaps *default_caps = user_data;
1068 gint i;
1069 gint caps_size;
1070
1071 caps_size = gst_caps_get_size (default_caps);
1072 for (i = 0; i < caps_size; i++) {
1073 GstStructure *structure = gst_caps_get_structure (default_caps, i);
1074 if (gst_structure_id_has_field (structure, field_id))
1075 gst_structure_id_set_value (structure, field_id, value);
1076 }
1077
1078 return TRUE;
1079 }
1080
1081 static GstCaps *
gst_base_parse_negotiate_default_caps(GstBaseParse * parse)1082 gst_base_parse_negotiate_default_caps (GstBaseParse * parse)
1083 {
1084 GstCaps *caps, *templcaps;
1085 GstCaps *sinkcaps = NULL;
1086 GstCaps *default_caps = NULL;
1087 GstStructure *structure;
1088
1089 templcaps = gst_pad_get_pad_template_caps (GST_BASE_PARSE_SRC_PAD (parse));
1090 caps = gst_pad_peer_query_caps (GST_BASE_PARSE_SRC_PAD (parse), templcaps);
1091 if (caps)
1092 gst_caps_unref (templcaps);
1093 else
1094 caps = templcaps;
1095 templcaps = NULL;
1096
1097 if (!caps || gst_caps_is_empty (caps) || gst_caps_is_any (caps)) {
1098 goto caps_error;
1099 }
1100
1101 GST_LOG_OBJECT (parse, "peer caps %" GST_PTR_FORMAT, caps);
1102
1103 /* before fixating, try to use whatever upstream provided */
1104 default_caps = gst_caps_copy (caps);
1105 sinkcaps = gst_pad_get_current_caps (GST_BASE_PARSE_SINK_PAD (parse));
1106
1107 GST_LOG_OBJECT (parse, "current caps %" GST_PTR_FORMAT " for sinkpad",
1108 sinkcaps);
1109
1110 if (sinkcaps) {
1111 structure = gst_caps_get_structure (sinkcaps, 0);
1112 gst_structure_foreach (structure, update_upstream_provided, default_caps);
1113 }
1114
1115 default_caps = gst_caps_fixate (default_caps);
1116
1117 if (!default_caps) {
1118 GST_WARNING_OBJECT (parse, "Failed to create default caps !");
1119 goto caps_error;
1120 }
1121
1122 GST_INFO_OBJECT (parse,
1123 "Chose default caps %" GST_PTR_FORMAT " for initial gap", default_caps);
1124
1125 if (sinkcaps)
1126 gst_caps_unref (sinkcaps);
1127 gst_caps_unref (caps);
1128
1129 return default_caps;
1130
1131 caps_error:
1132 {
1133 if (caps)
1134 gst_caps_unref (caps);
1135 if (sinkcaps)
1136 gst_caps_unref (sinkcaps);
1137 return NULL;
1138 }
1139 }
1140
1141 /* gst_base_parse_sink_event:
1142 * @pad: #GstPad that received the event.
1143 * @event: #GstEvent to be handled.
1144 *
1145 * Handler for sink pad events.
1146 *
1147 * Returns: %TRUE if the event was handled.
1148 */
1149 static gboolean
gst_base_parse_sink_event(GstPad * pad,GstObject * parent,GstEvent * event)1150 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
1151 {
1152 GstBaseParse *parse = GST_BASE_PARSE (parent);
1153 GstBaseParseClass *bclass = GST_BASE_PARSE_GET_CLASS (parse);
1154 gboolean ret;
1155
1156 ret = bclass->sink_event (parse, event);
1157
1158 return ret;
1159 }
1160
1161 /* gst_base_parse_sink_event_default:
1162 * @parse: #GstBaseParse.
1163 * @event: #GstEvent to be handled.
1164 *
1165 * Element-level event handler function.
1166 *
1167 * The event will be unreffed only if it has been handled and this
1168 * function returns %TRUE
1169 *
1170 * Returns: %TRUE if the event was handled and not need forwarding.
1171 */
1172 static gboolean
gst_base_parse_sink_event_default(GstBaseParse * parse,GstEvent * event)1173 gst_base_parse_sink_event_default (GstBaseParse * parse, GstEvent * event)
1174 {
1175 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1176 gboolean ret = FALSE;
1177 gboolean forward_immediate = FALSE;
1178
1179 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
1180 GST_EVENT_TYPE_NAME (event));
1181
1182 switch (GST_EVENT_TYPE (event)) {
1183 case GST_EVENT_CAPS:
1184 {
1185 GstCaps *caps;
1186
1187 gst_event_parse_caps (event, &caps);
1188 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
1189
1190 if (klass->set_sink_caps)
1191 ret = klass->set_sink_caps (parse, caps);
1192 else
1193 ret = TRUE;
1194
1195 /* will send our own caps downstream */
1196 gst_event_unref (event);
1197 event = NULL;
1198 break;
1199 }
1200 case GST_EVENT_SEGMENT:
1201 {
1202 const GstSegment *in_segment;
1203 GstSegment out_segment;
1204 gint64 offset = 0, next_dts;
1205
1206 parse->priv->segment_seqnum = gst_event_get_seqnum (event);
1207 gst_event_parse_segment (event, &in_segment);
1208 gst_segment_init (&out_segment, GST_FORMAT_TIME);
1209 out_segment.rate = in_segment->rate;
1210 out_segment.applied_rate = in_segment->applied_rate;
1211
1212 GST_DEBUG_OBJECT (parse, "New segment %" GST_SEGMENT_FORMAT, in_segment);
1213 GST_DEBUG_OBJECT (parse, "Current segment %" GST_SEGMENT_FORMAT,
1214 &parse->segment);
1215
1216 parse->priv->upstream_format = in_segment->format;
1217 if (in_segment->format == GST_FORMAT_BYTES) {
1218 GstBaseParseSeek *seek = NULL;
1219 GSList *node;
1220
1221 /* stop time is allowed to be open-ended, but not start & pos */
1222 offset = in_segment->time;
1223
1224 GST_OBJECT_LOCK (parse);
1225 for (node = parse->priv->pending_seeks; node; node = node->next) {
1226 GstBaseParseSeek *tmp = node->data;
1227
1228 if (tmp->offset == offset) {
1229 seek = tmp;
1230 break;
1231 }
1232 }
1233 parse->priv->pending_seeks =
1234 g_slist_remove (parse->priv->pending_seeks, seek);
1235 GST_OBJECT_UNLOCK (parse);
1236
1237 if (seek) {
1238 GST_DEBUG_OBJECT (parse,
1239 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
1240 seek->accurate ? " accurate" : "", &seek->segment);
1241
1242 out_segment.start = seek->segment.start;
1243 out_segment.stop = seek->segment.stop;
1244 out_segment.time = seek->segment.start;
1245
1246 next_dts = seek->start_ts;
1247 parse->priv->exact_position = seek->accurate;
1248 g_free (seek);
1249 } else {
1250 /* best attempt convert */
1251 /* as these are only estimates, stop is kept open-ended to avoid
1252 * premature cutting */
1253 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
1254 GST_FORMAT_TIME, (gint64 *) & next_dts);
1255
1256 out_segment.start = next_dts;
1257 out_segment.stop = GST_CLOCK_TIME_NONE;
1258 out_segment.time = next_dts;
1259
1260 parse->priv->exact_position = (in_segment->start == 0);
1261 }
1262
1263 gst_event_unref (event);
1264
1265 event = gst_event_new_segment (&out_segment);
1266 gst_event_set_seqnum (event, parse->priv->segment_seqnum);
1267
1268 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1269 GST_SEGMENT_FORMAT, in_segment);
1270
1271 } else if (in_segment->format != GST_FORMAT_TIME) {
1272 /* Unknown incoming segment format. Output a default open-ended
1273 * TIME segment */
1274 gst_event_unref (event);
1275
1276 out_segment.start = 0;
1277 out_segment.stop = GST_CLOCK_TIME_NONE;
1278 out_segment.time = 0;
1279
1280 event = gst_event_new_segment (&out_segment);
1281 gst_event_set_seqnum (event, parse->priv->segment_seqnum);
1282
1283 next_dts = 0;
1284 } else {
1285 /* not considered BYTE seekable if it is talking to us in TIME,
1286 * whatever else it might claim */
1287 parse->priv->upstream_seekable = FALSE;
1288 next_dts = in_segment->start;
1289 gst_event_copy_segment (event, &out_segment);
1290 }
1291
1292 GST_DEBUG_OBJECT (parse, "OUT segment %" GST_SEGMENT_FORMAT,
1293 &out_segment);
1294 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1295
1296 /*
1297 gst_segment_set_newsegment (&parse->segment, update, rate,
1298 applied_rate, format, start, stop, start);
1299 */
1300
1301 ret = TRUE;
1302
1303 /* save the segment for later, right before we push a new buffer so that
1304 * the caps are fixed and the next linked element can receive
1305 * the segment but finish the current segment */
1306 GST_DEBUG_OBJECT (parse, "draining current segment");
1307 if (in_segment->rate > 0.0)
1308 gst_base_parse_drain (parse);
1309 else
1310 gst_base_parse_finish_fragment (parse, FALSE);
1311 gst_adapter_clear (parse->priv->adapter);
1312
1313 parse->priv->offset = offset;
1314 parse->priv->sync_offset = offset;
1315 parse->priv->next_dts = next_dts;
1316 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
1317 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
1318 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
1319 parse->priv->prev_pts = GST_CLOCK_TIME_NONE;
1320 parse->priv->prev_dts = GST_CLOCK_TIME_NONE;
1321 parse->priv->prev_dts_from_pts = FALSE;
1322 parse->priv->discont = TRUE;
1323 parse->priv->seen_keyframe = FALSE;
1324 parse->priv->skip = 0;
1325 break;
1326 }
1327
1328 case GST_EVENT_SEGMENT_DONE:
1329 /* need to drain now, rather than upon a new segment,
1330 * since that would have SEGMENT_DONE come before potential
1331 * delayed last part of the current segment */
1332 GST_DEBUG_OBJECT (parse, "draining current segment");
1333 if (parse->segment.rate > 0.0)
1334 gst_base_parse_drain (parse);
1335 else
1336 gst_base_parse_finish_fragment (parse, FALSE);
1337 /* Also forward event immediately, there might be no new data
1338 * coming afterwards that would allow us to forward it later */
1339 forward_immediate = TRUE;
1340 break;
1341
1342 case GST_EVENT_FLUSH_START:
1343 GST_OBJECT_LOCK (parse);
1344 parse->priv->flushing = TRUE;
1345 GST_OBJECT_UNLOCK (parse);
1346 break;
1347
1348 case GST_EVENT_FLUSH_STOP:
1349 gst_adapter_clear (parse->priv->adapter);
1350 gst_base_parse_clear_queues (parse);
1351 parse->priv->flushing = FALSE;
1352 parse->priv->discont = TRUE;
1353 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
1354 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
1355 parse->priv->new_frame = TRUE;
1356 parse->priv->skip = 0;
1357
1358 forward_immediate = TRUE;
1359 break;
1360
1361 case GST_EVENT_EOS:
1362 if (parse->segment.rate > 0.0)
1363 gst_base_parse_drain (parse);
1364 else
1365 gst_base_parse_finish_fragment (parse, TRUE);
1366
1367 /* If we STILL have zero frames processed, fire an error */
1368 if (parse->priv->framecount == 0 && !parse->priv->saw_gaps &&
1369 !parse->priv->first_buffer) {
1370 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1371 ("No valid frames found before end of stream"), (NULL));
1372 }
1373
1374 if (!parse->priv->saw_gaps
1375 && parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1376 /* We've not posted bitrate tags yet - do so now */
1377 gst_base_parse_queue_tag_event_update (parse);
1378 }
1379
1380 /* newsegment and other serialized events before eos */
1381 gst_base_parse_push_pending_events (parse);
1382
1383 forward_immediate = TRUE;
1384 break;
1385 case GST_EVENT_CUSTOM_DOWNSTREAM:{
1386 /* FIXME: Code duplicated from libgstvideo because core can't depend on -base */
1387 #ifndef GST_VIDEO_EVENT_STILL_STATE_NAME
1388 #define GST_VIDEO_EVENT_STILL_STATE_NAME "GstEventStillFrame"
1389 #endif
1390
1391 const GstStructure *s;
1392 gboolean ev_still_state;
1393
1394 s = gst_event_get_structure (event);
1395 if (s != NULL &&
1396 gst_structure_has_name (s, GST_VIDEO_EVENT_STILL_STATE_NAME) &&
1397 gst_structure_get_boolean (s, "still-state", &ev_still_state)) {
1398 if (ev_still_state) {
1399 GST_DEBUG_OBJECT (parse, "draining current data for still-frame");
1400 if (parse->segment.rate > 0.0)
1401 gst_base_parse_drain (parse);
1402 else
1403 gst_base_parse_finish_fragment (parse, TRUE);
1404 }
1405 forward_immediate = TRUE;
1406 }
1407 break;
1408 }
1409 case GST_EVENT_GAP:
1410 {
1411 GST_DEBUG_OBJECT (parse, "draining current data due to gap event");
1412
1413 /* Ensure we have caps before forwarding the event */
1414 if (!gst_pad_has_current_caps (GST_BASE_PARSE_SRC_PAD (parse))) {
1415 GstCaps *default_caps = NULL;
1416 if ((default_caps = gst_base_parse_negotiate_default_caps (parse))) {
1417 GList *l;
1418 GstEvent *caps_event = gst_event_new_caps (default_caps);
1419
1420 GST_DEBUG_OBJECT (parse,
1421 "Store caps event to pending list for initial pre-rolling");
1422
1423 /* Events are in decreasing order. Go down the list until we
1424 * find the first pre-CAPS event and insert our CAPS event there.
1425 *
1426 * There should be a SEGMENT event already, which is > CAPS */
1427 for (l = parse->priv->pending_events; l; l = l->next) {
1428 GstEvent *e = l->data;
1429
1430 if (GST_EVENT_TYPE (e) < GST_EVENT_CAPS) {
1431 parse->priv->pending_events =
1432 g_list_insert_before (parse->priv->pending_events, l,
1433 caps_event);
1434 break;
1435 }
1436 }
1437 /* No pending event that is < CAPS, so we have to add it at the very
1438 * end of the list */
1439 if (!l) {
1440 parse->priv->pending_events =
1441 g_list_append (parse->priv->pending_events, caps_event);
1442 }
1443 gst_caps_unref (default_caps);
1444 } else {
1445 gst_event_unref (event);
1446 event = NULL;
1447 ret = FALSE;
1448 GST_ELEMENT_ERROR (parse, STREAM, FORMAT, (NULL),
1449 ("Parser output not negotiated before GAP event."));
1450 break;
1451 }
1452 }
1453
1454 gst_base_parse_push_pending_events (parse);
1455
1456 if (parse->segment.rate > 0.0)
1457 gst_base_parse_drain (parse);
1458 else
1459 gst_base_parse_finish_fragment (parse, TRUE);
1460 forward_immediate = TRUE;
1461 parse->priv->saw_gaps = TRUE;
1462 break;
1463 }
1464 case GST_EVENT_TAG:
1465 {
1466 GstTagList *tags = NULL;
1467
1468 gst_event_parse_tag (event, &tags);
1469
1470 /* We only care about stream tags here, global tags we just forward */
1471 if (gst_tag_list_get_scope (tags) != GST_TAG_SCOPE_STREAM)
1472 break;
1473
1474 gst_base_parse_set_upstream_tags (parse, tags);
1475 gst_base_parse_queue_tag_event_update (parse);
1476 parse->priv->tags_changed = FALSE;
1477 gst_event_unref (event);
1478 event = NULL;
1479 ret = TRUE;
1480 break;
1481 }
1482 case GST_EVENT_STREAM_START:
1483 {
1484 if (parse->priv->pad_mode != GST_PAD_MODE_PULL)
1485 forward_immediate = TRUE;
1486
1487 gst_base_parse_set_upstream_tags (parse, NULL);
1488 parse->priv->tags_changed = TRUE;
1489 break;
1490 }
1491 default:
1492 break;
1493 }
1494
1495 /* Forward non-serialized events and EOS/FLUSH_STOP immediately.
1496 * For EOS this is required because no buffer or serialized event
1497 * will come after EOS and nothing could trigger another
1498 * _finish_frame() call. *
1499 * If the subclass handles sending of EOS manually it can return
1500 * _DROPPED from ::finish() and all other subclasses should have
1501 * decoded/flushed all remaining data before this
1502 *
1503 * For FLUSH_STOP this is required because it is expected
1504 * to be forwarded immediately and no buffers are queued anyway.
1505 */
1506 if (event) {
1507 if (!GST_EVENT_IS_SERIALIZED (event) || forward_immediate) {
1508 ret = gst_pad_push_event (parse->srcpad, event);
1509 } else {
1510 parse->priv->pending_events =
1511 g_list_prepend (parse->priv->pending_events, event);
1512 ret = TRUE;
1513 }
1514 }
1515
1516 GST_DEBUG_OBJECT (parse, "event handled");
1517
1518 return ret;
1519 }
1520
1521 static gboolean
gst_base_parse_sink_query_default(GstBaseParse * parse,GstQuery * query)1522 gst_base_parse_sink_query_default (GstBaseParse * parse, GstQuery * query)
1523 {
1524 GstPad *pad;
1525 gboolean res;
1526
1527 pad = GST_BASE_PARSE_SINK_PAD (parse);
1528
1529 switch (GST_QUERY_TYPE (query)) {
1530 case GST_QUERY_CAPS:
1531 {
1532 GstBaseParseClass *bclass;
1533
1534 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1535
1536 if (bclass->get_sink_caps) {
1537 GstCaps *caps, *filter;
1538
1539 gst_query_parse_caps (query, &filter);
1540 caps = bclass->get_sink_caps (parse, filter);
1541 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1542 caps);
1543 gst_query_set_caps_result (query, caps);
1544 gst_caps_unref (caps);
1545
1546 res = TRUE;
1547 } else {
1548 GstCaps *caps, *template_caps, *filter;
1549
1550 gst_query_parse_caps (query, &filter);
1551 template_caps = gst_pad_get_pad_template_caps (pad);
1552 if (filter != NULL) {
1553 caps =
1554 gst_caps_intersect_full (filter, template_caps,
1555 GST_CAPS_INTERSECT_FIRST);
1556 gst_caps_unref (template_caps);
1557 } else {
1558 caps = template_caps;
1559 }
1560 gst_query_set_caps_result (query, caps);
1561 gst_caps_unref (caps);
1562
1563 res = TRUE;
1564 }
1565 break;
1566 }
1567 default:
1568 {
1569 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
1570 break;
1571 }
1572 }
1573
1574 return res;
1575 }
1576
1577 static gboolean
gst_base_parse_sink_query(GstPad * pad,GstObject * parent,GstQuery * query)1578 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1579 {
1580 GstBaseParseClass *bclass;
1581 GstBaseParse *parse;
1582 gboolean ret;
1583
1584 parse = GST_BASE_PARSE (parent);
1585 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1586
1587 GST_DEBUG_OBJECT (parse, "%s query", GST_QUERY_TYPE_NAME (query));
1588
1589 if (bclass->sink_query)
1590 ret = bclass->sink_query (parse, query);
1591 else
1592 ret = FALSE;
1593
1594 GST_LOG_OBJECT (parse, "%s query result: %d %" GST_PTR_FORMAT,
1595 GST_QUERY_TYPE_NAME (query), ret, query);
1596
1597 return ret;
1598 }
1599
1600 static gboolean
gst_base_parse_src_query(GstPad * pad,GstObject * parent,GstQuery * query)1601 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
1602 {
1603 GstBaseParseClass *bclass;
1604 GstBaseParse *parse;
1605 gboolean ret;
1606
1607 parse = GST_BASE_PARSE (parent);
1608 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1609
1610 GST_DEBUG_OBJECT (parse, "%s query: %" GST_PTR_FORMAT,
1611 GST_QUERY_TYPE_NAME (query), query);
1612
1613 if (bclass->src_query)
1614 ret = bclass->src_query (parse, query);
1615 else
1616 ret = FALSE;
1617
1618 GST_LOG_OBJECT (parse, "%s query result: %d %" GST_PTR_FORMAT,
1619 GST_QUERY_TYPE_NAME (query), ret, query);
1620
1621 return ret;
1622 }
1623
1624 /* gst_base_parse_src_event:
1625 * @pad: #GstPad that received the event.
1626 * @event: #GstEvent that was received.
1627 *
1628 * Handler for source pad events.
1629 *
1630 * Returns: %TRUE if the event was handled.
1631 */
1632 static gboolean
gst_base_parse_src_event(GstPad * pad,GstObject * parent,GstEvent * event)1633 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1634 {
1635 GstBaseParse *parse;
1636 GstBaseParseClass *bclass;
1637 gboolean ret = TRUE;
1638
1639 parse = GST_BASE_PARSE (parent);
1640 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1641
1642 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1643 GST_EVENT_TYPE_NAME (event));
1644
1645 if (bclass->src_event)
1646 ret = bclass->src_event (parse, event);
1647 else
1648 gst_event_unref (event);
1649
1650 return ret;
1651 }
1652
1653 static gboolean
gst_base_parse_is_seekable(GstBaseParse * parse)1654 gst_base_parse_is_seekable (GstBaseParse * parse)
1655 {
1656 /* FIXME: could do more here, e.g. check index or just send data from 0
1657 * in pull mode and let decoder/sink clip */
1658 return parse->priv->syncable;
1659 }
1660
1661 /* gst_base_parse_src_event_default:
1662 * @parse: #GstBaseParse.
1663 * @event: #GstEvent that was received.
1664 *
1665 * Default srcpad event handler.
1666 *
1667 * Returns: %TRUE if the event was handled and can be dropped.
1668 */
1669 static gboolean
gst_base_parse_src_event_default(GstBaseParse * parse,GstEvent * event)1670 gst_base_parse_src_event_default (GstBaseParse * parse, GstEvent * event)
1671 {
1672 gboolean res = FALSE;
1673
1674 switch (GST_EVENT_TYPE (event)) {
1675 case GST_EVENT_SEEK:
1676 if (gst_base_parse_is_seekable (parse))
1677 res = gst_base_parse_handle_seek (parse, event);
1678 break;
1679 default:
1680 res = gst_pad_event_default (parse->srcpad, GST_OBJECT_CAST (parse),
1681 event);
1682 break;
1683 }
1684 return res;
1685 }
1686
1687
1688 /**
1689 * gst_base_parse_convert_default:
1690 * @parse: #GstBaseParse.
1691 * @src_format: #GstFormat describing the source format.
1692 * @src_value: Source value to be converted.
1693 * @dest_format: #GstFormat defining the converted format.
1694 * @dest_value: (out): Pointer where the conversion result will be put.
1695 *
1696 * Default implementation of #GstBaseParseClass.convert().
1697 *
1698 * Returns: %TRUE if conversion was successful.
1699 */
1700 gboolean
gst_base_parse_convert_default(GstBaseParse * parse,GstFormat src_format,gint64 src_value,GstFormat dest_format,gint64 * dest_value)1701 gst_base_parse_convert_default (GstBaseParse * parse,
1702 GstFormat src_format,
1703 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1704 {
1705 gboolean ret = FALSE;
1706 guint64 bytes, duration;
1707
1708 if (G_UNLIKELY (src_format == dest_format)) {
1709 *dest_value = src_value;
1710 return TRUE;
1711 }
1712
1713 if (G_UNLIKELY (src_value == -1)) {
1714 *dest_value = -1;
1715 return TRUE;
1716 }
1717
1718 if (G_UNLIKELY (src_value == 0)) {
1719 *dest_value = 0;
1720 return TRUE;
1721 }
1722
1723 if (parse->priv->upstream_format != GST_FORMAT_BYTES) {
1724 /* don't do byte format conversions if we're not really parsing
1725 * a raw elementary stream, since we don't really have BYTES
1726 * position / duration info */
1727 if (src_format == GST_FORMAT_BYTES || dest_format == GST_FORMAT_BYTES)
1728 goto no_slaved_conversions;
1729 }
1730
1731 /* need at least some frames */
1732 if (!parse->priv->framecount)
1733 goto no_framecount;
1734
1735 duration = parse->priv->acc_duration / GST_MSECOND;
1736 bytes = parse->priv->bytecount;
1737
1738 if (G_UNLIKELY (!duration || !bytes))
1739 goto no_duration_bytes;
1740
1741 if (src_format == GST_FORMAT_BYTES) {
1742 if (dest_format == GST_FORMAT_TIME) {
1743 /* BYTES -> TIME conversion */
1744 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1745 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1746 *dest_value *= GST_MSECOND;
1747 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1748 *dest_value / GST_MSECOND);
1749 ret = TRUE;
1750 } else {
1751 GST_DEBUG_OBJECT (parse, "converting bytes -> other not implemented");
1752 }
1753 } else if (src_format == GST_FORMAT_TIME) {
1754 if (dest_format == GST_FORMAT_BYTES) {
1755 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1756 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1757 duration);
1758 GST_DEBUG_OBJECT (parse,
1759 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1760 src_value / GST_MSECOND, *dest_value);
1761 ret = TRUE;
1762 } else {
1763 GST_DEBUG_OBJECT (parse, "converting time -> other not implemented");
1764 }
1765 } else if (src_format == GST_FORMAT_DEFAULT) {
1766 /* DEFAULT == frame-based */
1767 if (dest_format == GST_FORMAT_TIME) {
1768 GST_DEBUG_OBJECT (parse, "converting default -> time");
1769 if (parse->priv->fps_den) {
1770 *dest_value = gst_util_uint64_scale (src_value,
1771 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1772 ret = TRUE;
1773 }
1774 } else {
1775 GST_DEBUG_OBJECT (parse, "converting default -> other not implemented");
1776 }
1777 } else {
1778 GST_DEBUG_OBJECT (parse, "conversion not implemented");
1779 }
1780 return ret;
1781
1782 /* ERRORS */
1783 no_framecount:
1784 {
1785 GST_DEBUG_OBJECT (parse, "no framecount");
1786 return FALSE;
1787 }
1788 no_duration_bytes:
1789 {
1790 GST_DEBUG_OBJECT (parse, "no duration %" G_GUINT64_FORMAT ", bytes %"
1791 G_GUINT64_FORMAT, duration, bytes);
1792 return FALSE;
1793 }
1794 no_slaved_conversions:
1795 {
1796 GST_DEBUG_OBJECT (parse,
1797 "Can't do format conversions when upstream format is not BYTES");
1798 return FALSE;
1799 }
1800 }
1801
1802 static void
gst_base_parse_update_duration(GstBaseParse * parse)1803 gst_base_parse_update_duration (GstBaseParse * parse)
1804 {
1805 gint64 ptot, dest_value;
1806
1807 if (!gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &ptot))
1808 return;
1809
1810 if (!gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1811 GST_FORMAT_TIME, &dest_value))
1812 return;
1813
1814 /* inform if duration changed, but try to avoid spamming */
1815 parse->priv->estimated_drift += dest_value - parse->priv->estimated_duration;
1816
1817 parse->priv->estimated_duration = dest_value;
1818 GST_LOG_OBJECT (parse,
1819 "updated estimated duration to %" GST_TIME_FORMAT,
1820 GST_TIME_ARGS (dest_value));
1821
1822 if (parse->priv->estimated_drift > GST_SECOND ||
1823 parse->priv->estimated_drift < -GST_SECOND) {
1824 gst_element_post_message (GST_ELEMENT (parse),
1825 gst_message_new_duration_changed (GST_OBJECT (parse)));
1826 parse->priv->estimated_drift = 0;
1827 }
1828 }
1829
1830 /* gst_base_parse_update_bitrates:
1831 * @parse: #GstBaseParse.
1832 * @buffer: Current frame as a #GstBuffer
1833 *
1834 * Keeps track of the minimum and maximum bitrates, and also maintains a
1835 * running average bitrate of the stream so far.
1836 */
1837 static void
gst_base_parse_update_bitrates(GstBaseParse * parse,GstBaseParseFrame * frame)1838 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1839 {
1840 guint64 data_len, frame_dur;
1841 gint overhead;
1842 guint frame_bitrate;
1843 guint64 frame_bitrate64;
1844 GstBuffer *buffer = frame->buffer;
1845
1846 overhead = frame->overhead;
1847 if (overhead == -1)
1848 return;
1849
1850 data_len = gst_buffer_get_size (buffer) - overhead;
1851 parse->priv->data_bytecount += data_len;
1852
1853 /* duration should be valid by now,
1854 * either set by subclass or maybe based on fps settings */
1855 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1856 guint64 avg_bitrate;
1857
1858 /* Calculate duration of a frame from buffer properties */
1859 frame_dur = GST_BUFFER_DURATION (buffer);
1860 avg_bitrate = gst_util_uint64_scale (GST_SECOND,
1861 8 * parse->priv->data_bytecount, parse->priv->acc_duration);
1862
1863 if (avg_bitrate > G_MAXUINT)
1864 return;
1865
1866 parse->priv->avg_bitrate = (guint) avg_bitrate;
1867 } else {
1868 /* No way to figure out frame duration (is this even possible?) */
1869 return;
1870 }
1871
1872 /* override if subclass provided bitrate, e.g. metadata based */
1873 if (parse->priv->bitrate) {
1874 parse->priv->avg_bitrate = parse->priv->bitrate;
1875 /* spread this (confirmed) info ASAP */
1876 if (parse->priv->post_avg_bitrate &&
1877 parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1878 parse->priv->tags_changed = TRUE;
1879 }
1880
1881 if (!frame_dur)
1882 return;
1883
1884 frame_bitrate64 = gst_util_uint64_scale (GST_SECOND, 8 * data_len, frame_dur);
1885
1886 if (frame_bitrate64 > G_MAXUINT)
1887 return;
1888
1889 frame_bitrate = (guint) frame_bitrate64;
1890
1891 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1892 parse->priv->avg_bitrate);
1893
1894 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
1895 return;
1896
1897 if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE &&
1898 (parse->priv->post_min_bitrate || parse->priv->post_avg_bitrate
1899 || parse->priv->post_max_bitrate))
1900 parse->priv->tags_changed = TRUE;
1901
1902 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1903 if (frame_bitrate < parse->priv->min_bitrate) {
1904 parse->priv->min_bitrate = frame_bitrate;
1905 if (parse->priv->post_min_bitrate)
1906 parse->priv->tags_changed = TRUE;
1907 }
1908
1909 if (frame_bitrate > parse->priv->max_bitrate) {
1910 parse->priv->max_bitrate = frame_bitrate;
1911 if (parse->priv->post_max_bitrate)
1912 parse->priv->tags_changed = TRUE;
1913 }
1914
1915 /* Only update the tag on a 2% change */
1916 if (parse->priv->post_avg_bitrate && parse->priv->avg_bitrate) {
1917 guint64 diffprev = gst_util_uint64_scale (100,
1918 ABSDIFF (parse->priv->avg_bitrate, parse->priv->posted_avg_bitrate),
1919 parse->priv->avg_bitrate);
1920 if (diffprev >= UPDATE_THRESHOLD)
1921 parse->priv->tags_changed = TRUE;
1922 }
1923 }
1924 }
1925
1926 /**
1927 * gst_base_parse_add_index_entry:
1928 * @parse: #GstBaseParse.
1929 * @offset: offset of entry
1930 * @ts: timestamp associated with offset
1931 * @key: whether entry refers to keyframe
1932 * @force: add entry disregarding sanity checks
1933 *
1934 * Adds an entry to the index associating @offset to @ts. It is recommended
1935 * to only add keyframe entries. @force allows to bypass checks, such as
1936 * whether the stream is (upstream) seekable, another entry is already "close"
1937 * to the new entry, etc.
1938 *
1939 * Returns: #gboolean indicating whether entry was added
1940 */
1941 gboolean
gst_base_parse_add_index_entry(GstBaseParse * parse,guint64 offset,GstClockTime ts,gboolean key,gboolean force)1942 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1943 GstClockTime ts, gboolean key, gboolean force)
1944 {
1945 gboolean ret = FALSE;
1946 GstIndexAssociation associations[2];
1947
1948 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1949 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1950
1951 if (G_LIKELY (!force)) {
1952
1953 if (!parse->priv->upstream_seekable) {
1954 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1955 goto exit;
1956 }
1957
1958 /* FIXME need better helper data structure that handles these issues
1959 * related to ongoing collecting of index entries */
1960 if (parse->priv->index_last_offset + parse->priv->idx_byte_interval >=
1961 (gint64) offset) {
1962 GST_LOG_OBJECT (parse,
1963 "already have entries up to offset 0x%08" G_GINT64_MODIFIER "x",
1964 parse->priv->index_last_offset + parse->priv->idx_byte_interval);
1965 goto exit;
1966 }
1967
1968 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1969 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1970 parse->priv->idx_interval) {
1971 GST_LOG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1972 GST_TIME_ARGS (parse->priv->index_last_ts));
1973 goto exit;
1974 }
1975
1976 /* if last is not really the last one */
1977 if (!parse->priv->index_last_valid) {
1978 GstClockTime prev_ts;
1979
1980 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1981 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1982 GST_LOG_OBJECT (parse,
1983 "entry too close to existing entry %" GST_TIME_FORMAT,
1984 GST_TIME_ARGS (prev_ts));
1985 parse->priv->index_last_offset = offset;
1986 parse->priv->index_last_ts = ts;
1987 goto exit;
1988 }
1989 }
1990 }
1991
1992 associations[0].format = GST_FORMAT_TIME;
1993 associations[0].value = ts;
1994 associations[1].format = GST_FORMAT_BYTES;
1995 associations[1].value = offset;
1996
1997 /* index might change on-the-fly, although that would be nutty app ... */
1998 GST_BASE_PARSE_INDEX_LOCK (parse);
1999 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
2000 (key) ? GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT :
2001 GST_INDEX_ASSOCIATION_FLAG_DELTA_UNIT, 2,
2002 (const GstIndexAssociation *) &associations);
2003 GST_BASE_PARSE_INDEX_UNLOCK (parse);
2004
2005 if (key) {
2006 parse->priv->index_last_offset = offset;
2007 parse->priv->index_last_ts = ts;
2008 }
2009
2010 ret = TRUE;
2011
2012 exit:
2013 return ret;
2014 }
2015
2016 /* check for seekable upstream, above and beyond a mere query */
2017 static void
gst_base_parse_check_seekability(GstBaseParse * parse)2018 gst_base_parse_check_seekability (GstBaseParse * parse)
2019 {
2020 GstQuery *query;
2021 gboolean seekable = FALSE;
2022 gint64 start = -1, stop = -1;
2023 guint idx_interval = 0;
2024 guint64 idx_byte_interval = 0;
2025
2026 query = gst_query_new_seeking (GST_FORMAT_BYTES);
2027 if (!gst_pad_peer_query (parse->sinkpad, query)) {
2028 GST_DEBUG_OBJECT (parse, "seeking query failed");
2029 goto done;
2030 }
2031
2032 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
2033
2034 /* try harder to query upstream size if we didn't get it the first time */
2035 if (seekable && stop == -1) {
2036 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
2037 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
2038 }
2039
2040 /* if upstream doesn't know the size, it's likely that it's not seekable in
2041 * practice even if it technically may be seekable */
2042 if (seekable && (start != 0 || stop <= start)) {
2043 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
2044 seekable = FALSE;
2045 }
2046
2047 /* let's not put every single frame into our index */
2048 if (seekable) {
2049 if (stop < 10 * 1024 * 1024)
2050 idx_interval = 100;
2051 else if (stop < 100 * 1024 * 1024)
2052 idx_interval = 500;
2053 else
2054 idx_interval = 1000;
2055
2056 /* ensure that even for large files (e.g. very long audio files), the index
2057 * stays reasonably-size, with some arbitrary limit to the total number of
2058 * index entries */
2059 idx_byte_interval = (stop - start) / MAX_INDEX_ENTRIES;
2060 GST_DEBUG_OBJECT (parse,
2061 "Limiting index entries to %d, indexing byte interval %"
2062 G_GUINT64_FORMAT " bytes", MAX_INDEX_ENTRIES, idx_byte_interval);
2063 }
2064
2065 done:
2066 gst_query_unref (query);
2067
2068 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
2069 G_GUINT64_FORMAT ")", seekable, start, stop);
2070 parse->priv->upstream_seekable = seekable;
2071 parse->priv->upstream_size = seekable ? stop : 0;
2072
2073 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
2074 parse->priv->idx_interval = idx_interval * GST_MSECOND;
2075 parse->priv->idx_byte_interval = idx_byte_interval;
2076 }
2077
2078 /* some misc checks on upstream */
2079 static void
gst_base_parse_check_upstream(GstBaseParse * parse)2080 gst_base_parse_check_upstream (GstBaseParse * parse)
2081 {
2082 gint64 stop;
2083
2084 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
2085 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
2086 /* upstream has one, accept it also, and no further updates */
2087 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
2088 parse->priv->upstream_has_duration = TRUE;
2089 }
2090
2091 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
2092 parse->priv->upstream_has_duration);
2093 }
2094
2095 /* checks src caps to determine if dealing with audio or video */
2096 /* TODO maybe forego automagic stuff and let subclass configure it ? */
2097 static void
gst_base_parse_check_media(GstBaseParse * parse)2098 gst_base_parse_check_media (GstBaseParse * parse)
2099 {
2100 GstCaps *caps;
2101 GstStructure *s;
2102
2103 caps = gst_pad_get_current_caps (parse->srcpad);
2104 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
2105 parse->priv->is_video =
2106 g_str_has_prefix (gst_structure_get_name (s), "video");
2107 } else {
2108 /* historical default */
2109 parse->priv->is_video = FALSE;
2110 }
2111 if (caps)
2112 gst_caps_unref (caps);
2113
2114 parse->priv->checked_media = TRUE;
2115 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
2116 }
2117
2118 /* takes ownership of frame */
2119 static void
gst_base_parse_queue_frame(GstBaseParse * parse,GstBaseParseFrame * frame)2120 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
2121 {
2122 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
2123 /* frame allocated on the heap, we can just take ownership */
2124 g_queue_push_tail (&parse->priv->queued_frames, frame);
2125 GST_TRACE ("queued frame %p", frame);
2126 } else {
2127 GstBaseParseFrame *copy;
2128
2129 /* probably allocated on the stack, must make a proper copy */
2130 copy = gst_base_parse_frame_copy (frame);
2131 g_queue_push_tail (&parse->priv->queued_frames, copy);
2132 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
2133 gst_base_parse_frame_free (frame);
2134 }
2135 }
2136
2137 /* makes sure that @buf is properly prepared and decorated for passing
2138 * to baseclass, and an equally setup frame is returned setup with @buf.
2139 * Takes ownership of @buf. */
2140 static GstBaseParseFrame *
gst_base_parse_prepare_frame(GstBaseParse * parse,GstBuffer * buffer)2141 gst_base_parse_prepare_frame (GstBaseParse * parse, GstBuffer * buffer)
2142 {
2143 GstBaseParseFrame *frame = NULL;
2144
2145 buffer = gst_buffer_make_writable (buffer);
2146
2147 GST_LOG_OBJECT (parse,
2148 "preparing frame at offset %" G_GUINT64_FORMAT
2149 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
2150 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
2151 gst_buffer_get_size (buffer));
2152
2153 GST_BUFFER_OFFSET (buffer) = parse->priv->offset;
2154
2155 gst_base_parse_update_flags (parse);
2156
2157 frame = gst_base_parse_frame_new (buffer, 0, 0);
2158 gst_buffer_unref (buffer);
2159 gst_base_parse_update_frame (parse, frame);
2160
2161 /* clear flags for next frame */
2162 parse->priv->discont = FALSE;
2163 parse->priv->new_frame = FALSE;
2164
2165 /* use default handler to provide initial (upstream) metadata */
2166 gst_base_parse_parse_frame (parse, frame);
2167
2168 return frame;
2169 }
2170
2171 /* Wraps buffer in a frame and dispatches to subclass.
2172 * Also manages data skipping and offset handling (including adapter flushing).
2173 * Takes ownership of @buffer */
2174 static GstFlowReturn
gst_base_parse_handle_buffer(GstBaseParse * parse,GstBuffer * buffer,gint * skip,gint * flushed)2175 gst_base_parse_handle_buffer (GstBaseParse * parse, GstBuffer * buffer,
2176 gint * skip, gint * flushed)
2177 {
2178 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
2179 GstBaseParseFrame *frame;
2180 GstFlowReturn ret;
2181
2182 g_return_val_if_fail (skip != NULL || flushed != NULL, GST_FLOW_ERROR);
2183
2184 GST_LOG_OBJECT (parse,
2185 "handling buffer of size %" G_GSIZE_FORMAT " with dts %" GST_TIME_FORMAT
2186 ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
2187 gst_buffer_get_size (buffer), GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
2188 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
2189 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
2190
2191 /* track what is being flushed during this single round of frame processing */
2192 parse->priv->flushed = 0;
2193 *skip = 0;
2194
2195 /* make it easy for _finish_frame to pick up input data */
2196 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
2197 gst_buffer_ref (buffer);
2198 gst_adapter_push (parse->priv->adapter, buffer);
2199 }
2200
2201 frame = gst_base_parse_prepare_frame (parse, buffer);
2202 ret = klass->handle_frame (parse, frame, skip);
2203
2204 *flushed = parse->priv->flushed;
2205
2206 GST_LOG_OBJECT (parse, "handle_frame skipped %d, flushed %d",
2207 *skip, *flushed);
2208
2209 /* subclass can only do one of these, or semantics are too unclear */
2210 g_assert (*skip == 0 || *flushed == 0);
2211
2212 /* track skipping */
2213 if (*skip > 0) {
2214 GstClockTime pts, dts;
2215 GstBuffer *outbuf;
2216
2217 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", *skip);
2218 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2219 /* reverse playback, and no frames found yet, so we are skipping
2220 * the leading part of a fragment, which may form the tail of
2221 * fragment coming later, hopefully subclass skips efficiently ... */
2222 pts = gst_adapter_prev_pts (parse->priv->adapter, NULL);
2223 dts = gst_adapter_prev_dts (parse->priv->adapter, NULL);
2224 outbuf = gst_adapter_take_buffer (parse->priv->adapter, *skip);
2225 outbuf = gst_buffer_make_writable (outbuf);
2226 GST_BUFFER_PTS (outbuf) = pts;
2227 GST_BUFFER_DTS (outbuf) = dts;
2228 parse->priv->buffers_head =
2229 g_slist_prepend (parse->priv->buffers_head, outbuf);
2230 outbuf = NULL;
2231 } else {
2232 /* If we're asked to skip more than is available in the adapter,
2233 we need to remember what we need to skip for next iteration */
2234 gsize av = gst_adapter_available (parse->priv->adapter);
2235 GST_DEBUG ("Asked to skip %u (%" G_GSIZE_FORMAT " available)", *skip, av);
2236 if (av >= *skip) {
2237 gst_adapter_flush (parse->priv->adapter, *skip);
2238 } else {
2239 GST_DEBUG
2240 ("This is more than available, flushing %" G_GSIZE_FORMAT
2241 ", storing %u to skip", av, (guint) (*skip - av));
2242 parse->priv->skip = *skip - av;
2243 gst_adapter_flush (parse->priv->adapter, av);
2244 *skip = av;
2245 }
2246 }
2247 if (!parse->priv->discont)
2248 parse->priv->sync_offset = parse->priv->offset;
2249 parse->priv->offset += *skip;
2250 parse->priv->discont = TRUE;
2251 /* check for indefinite skipping */
2252 if (ret == GST_FLOW_OK)
2253 ret = gst_base_parse_check_sync (parse);
2254 }
2255
2256 parse->priv->offset += *flushed;
2257
2258 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
2259 gst_adapter_clear (parse->priv->adapter);
2260 }
2261
2262 if (*skip == 0 && *flushed == 0) {
2263 /* Carry over discont if we need more data */
2264 if (GST_BUFFER_IS_DISCONT (frame->buffer))
2265 parse->priv->discont = TRUE;
2266 }
2267
2268 gst_base_parse_frame_free (frame);
2269
2270 return ret;
2271 }
2272
2273 /* gst_base_parse_push_pending_events:
2274 * @parse: #GstBaseParse
2275 *
2276 * Pushes the pending events
2277 */
2278 static void
gst_base_parse_push_pending_events(GstBaseParse * parse)2279 gst_base_parse_push_pending_events (GstBaseParse * parse)
2280 {
2281 if (G_UNLIKELY (parse->priv->pending_events)) {
2282 GList *r = g_list_reverse (parse->priv->pending_events);
2283 GList *l;
2284
2285 parse->priv->pending_events = NULL;
2286 for (l = r; l != NULL; l = l->next) {
2287 gst_pad_push_event (parse->srcpad, GST_EVENT_CAST (l->data));
2288 }
2289 g_list_free (r);
2290 }
2291 }
2292
2293 /* gst_base_parse_handle_and_push_frame:
2294 * @parse: #GstBaseParse.
2295 * @klass: #GstBaseParseClass.
2296 * @frame: (transfer full): a #GstBaseParseFrame
2297 *
2298 * Parses the frame from given buffer and pushes it forward. Also performs
2299 * timestamp handling and checks the segment limits.
2300 *
2301 * This is called with srcpad STREAM_LOCK held.
2302 *
2303 * Returns: #GstFlowReturn
2304 */
2305 static GstFlowReturn
gst_base_parse_handle_and_push_frame(GstBaseParse * parse,GstBaseParseFrame * frame)2306 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
2307 GstBaseParseFrame * frame)
2308 {
2309 gint64 offset;
2310 GstBuffer *buffer;
2311
2312 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2313
2314 buffer = frame->buffer;
2315 offset = frame->offset;
2316
2317 /* check if subclass/format can provide ts.
2318 * If so, that allows and enables extra seek and duration determining options */
2319 if (G_UNLIKELY (parse->priv->first_frame_offset < 0)) {
2320 if (GST_BUFFER_PTS_IS_VALID (buffer) && parse->priv->has_timing_info
2321 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
2322 parse->priv->first_frame_offset = offset;
2323 parse->priv->first_frame_pts = GST_BUFFER_PTS (buffer);
2324 parse->priv->first_frame_dts = GST_BUFFER_DTS (buffer);
2325 GST_DEBUG_OBJECT (parse, "subclass provided dts %" GST_TIME_FORMAT
2326 ", pts %" GST_TIME_FORMAT " for first frame at offset %"
2327 G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->first_frame_dts),
2328 GST_TIME_ARGS (parse->priv->first_frame_pts),
2329 parse->priv->first_frame_offset);
2330 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
2331 gint64 off;
2332 GstClockTime last_ts = G_MAXINT64;
2333
2334 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
2335 gst_base_parse_locate_time (parse, &last_ts, &off);
2336 if (GST_CLOCK_TIME_IS_VALID (last_ts))
2337 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
2338 }
2339 } else {
2340 /* disable further checks */
2341 parse->priv->first_frame_offset = 0;
2342 }
2343 }
2344
2345 /* track upstream time if provided, not subclass' internal notion of it */
2346 if (parse->priv->upstream_format == GST_FORMAT_TIME) {
2347 GST_BUFFER_PTS (frame->buffer) = GST_CLOCK_TIME_NONE;
2348 GST_BUFFER_DTS (frame->buffer) = GST_CLOCK_TIME_NONE;
2349 }
2350
2351 /* interpolating and no valid pts yet,
2352 * start with dts and carry on from there */
2353 if (parse->priv->infer_ts && parse->priv->pts_interpolate
2354 && !GST_CLOCK_TIME_IS_VALID (parse->priv->next_pts))
2355 parse->priv->next_pts = parse->priv->next_dts;
2356
2357 /* again use default handler to add missing metadata;
2358 * we may have new information on frame properties */
2359 gst_base_parse_parse_frame (parse, frame);
2360
2361 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
2362 if (GST_BUFFER_DTS_IS_VALID (buffer) && GST_BUFFER_DURATION_IS_VALID (buffer)) {
2363 parse->priv->next_dts =
2364 GST_BUFFER_DTS (buffer) + GST_BUFFER_DURATION (buffer);
2365 if (parse->priv->pts_interpolate && GST_BUFFER_PTS_IS_VALID (buffer)) {
2366 GstClockTime next_pts =
2367 GST_BUFFER_PTS (buffer) + GST_BUFFER_DURATION (buffer);
2368 if (next_pts >= parse->priv->next_dts)
2369 parse->priv->next_pts = next_pts;
2370 }
2371 } else {
2372 /* we lost track, do not produce bogus time next time around
2373 * (probably means parser subclass has given up on parsing as well) */
2374 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
2375 parse->priv->next_dts = GST_CLOCK_TIME_NONE;
2376 }
2377
2378 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
2379 GST_BUFFER_PTS_IS_VALID (buffer))
2380 gst_base_parse_add_index_entry (parse, offset,
2381 GST_BUFFER_PTS (buffer),
2382 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
2383
2384 /* All OK, push queued frames if there are any */
2385 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
2386 GstBaseParseFrame *queued_frame;
2387
2388 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
2389 gst_base_parse_push_frame (parse, queued_frame);
2390 gst_base_parse_frame_free (queued_frame);
2391 }
2392 }
2393
2394 return gst_base_parse_push_frame (parse, frame);
2395 }
2396
2397 /**
2398 * gst_base_parse_push_frame:
2399 * @parse: #GstBaseParse.
2400 * @frame: (transfer none): a #GstBaseParseFrame
2401 *
2402 * Pushes the frame's buffer downstream, sends any pending events and
2403 * does some timestamp and segment handling. Takes ownership of
2404 * frame's buffer, though caller retains ownership of @frame.
2405 *
2406 * This must be called with sinkpad STREAM_LOCK held.
2407 *
2408 * Returns: #GstFlowReturn
2409 */
2410 GstFlowReturn
gst_base_parse_push_frame(GstBaseParse * parse,GstBaseParseFrame * frame)2411 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
2412 {
2413 GstFlowReturn ret = GST_FLOW_OK;
2414 GstClockTime last_start = GST_CLOCK_TIME_NONE;
2415 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
2416 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
2417 GstBuffer *buffer;
2418 gsize size;
2419
2420 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2421 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
2422
2423 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
2424
2425 buffer = frame->buffer;
2426
2427 GST_LOG_OBJECT (parse,
2428 "processing buffer of size %" G_GSIZE_FORMAT " with dts %" GST_TIME_FORMAT
2429 ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
2430 gst_buffer_get_size (buffer),
2431 GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
2432 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
2433 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
2434
2435 /* update stats */
2436 parse->priv->bytecount += frame->size;
2437 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
2438 parse->priv->framecount++;
2439 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
2440 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
2441 }
2442 }
2443 /* 0 means disabled */
2444 if (parse->priv->update_interval < 0)
2445 parse->priv->update_interval = 50;
2446 else if (parse->priv->update_interval > 0 &&
2447 (parse->priv->framecount % parse->priv->update_interval) == 0)
2448 gst_base_parse_update_duration (parse);
2449
2450 if (GST_BUFFER_PTS_IS_VALID (buffer))
2451 last_start = last_stop = GST_BUFFER_PTS (buffer);
2452 if (last_start != GST_CLOCK_TIME_NONE
2453 && GST_BUFFER_DURATION_IS_VALID (buffer))
2454 last_stop = last_start + GST_BUFFER_DURATION (buffer);
2455
2456 /* should have caps by now */
2457 if (!gst_pad_has_current_caps (parse->srcpad))
2458 goto no_caps;
2459
2460 if (G_UNLIKELY (!parse->priv->checked_media)) {
2461 /* have caps; check identity */
2462 gst_base_parse_check_media (parse);
2463 }
2464
2465 if (parse->priv->tags_changed) {
2466 gst_base_parse_queue_tag_event_update (parse);
2467 parse->priv->tags_changed = FALSE;
2468 }
2469
2470 /* Push pending events, including SEGMENT events */
2471 gst_base_parse_push_pending_events (parse);
2472
2473 /* segment adjustment magic; only if we are running the whole show */
2474 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
2475 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
2476 parse->priv->upstream_seekable)) {
2477 /* handle gaps */
2478 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
2479 GST_CLOCK_TIME_IS_VALID (last_start)) {
2480 GstClockTimeDiff diff;
2481
2482 /* only send newsegments with increasing start times,
2483 * otherwise if these go back and forth downstream (sinks) increase
2484 * accumulated time and running_time */
2485 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
2486 if (G_UNLIKELY (diff > 2 * GST_SECOND
2487 && last_start > parse->segment.start
2488 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
2489 || last_start < parse->segment.stop))) {
2490 GstEvent *topush;
2491
2492 GST_DEBUG_OBJECT (parse,
2493 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
2494 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
2495 "Sending updated SEGMENT events", diff,
2496 GST_TIME_ARGS (parse->segment.position),
2497 GST_TIME_ARGS (last_start));
2498
2499 /* skip gap FIXME */
2500 topush = gst_event_new_segment (&parse->segment);
2501 if (parse->priv->segment_seqnum != GST_SEQNUM_INVALID)
2502 gst_event_set_seqnum (topush, parse->priv->segment_seqnum);
2503 gst_pad_push_event (parse->srcpad, topush);
2504
2505 parse->segment.position = last_start;
2506 }
2507 }
2508 }
2509
2510 /* update bitrates and optionally post corresponding tags
2511 * (following newsegment) */
2512 gst_base_parse_update_bitrates (parse, frame);
2513
2514 if (klass->pre_push_frame) {
2515 ret = klass->pre_push_frame (parse, frame);
2516 } else {
2517 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
2518 }
2519
2520 /* Push pending events, if there are any new ones
2521 * like tags added by pre_push_frame */
2522 if (parse->priv->tags_changed) {
2523 gst_base_parse_queue_tag_event_update (parse);
2524 parse->priv->tags_changed = FALSE;
2525 }
2526 gst_base_parse_push_pending_events (parse);
2527
2528 /* take final ownership of frame buffer */
2529 if (frame->out_buffer) {
2530 buffer = frame->out_buffer;
2531 frame->out_buffer = NULL;
2532 gst_buffer_replace (&frame->buffer, NULL);
2533 } else {
2534 buffer = frame->buffer;
2535 frame->buffer = NULL;
2536 }
2537
2538 /* subclass must play nice */
2539 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2540
2541 size = gst_buffer_get_size (buffer);
2542
2543 parse->priv->seen_keyframe |= parse->priv->is_video &&
2544 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
2545
2546 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
2547 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2548 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
2549 GST_BUFFER_TIMESTAMP (buffer) >
2550 parse->segment.stop + parse->priv->lead_out_ts) {
2551 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
2552 ret = GST_FLOW_EOS;
2553 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2554 GST_BUFFER_DURATION_IS_VALID (buffer) &&
2555 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
2556 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
2557 parse->priv->lead_in_ts < parse->segment.start) {
2558 if (parse->priv->seen_keyframe) {
2559 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
2560 ret = GST_FLOW_OK;
2561 } else {
2562 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
2563 ret = GST_BASE_PARSE_FLOW_DROPPED;
2564 }
2565 } else {
2566 ret = GST_FLOW_OK;
2567 }
2568 }
2569
2570 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2571 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2572 if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))
2573 parse->priv->discont = TRUE;
2574 gst_buffer_unref (buffer);
2575 ret = GST_FLOW_OK;
2576 } else if (ret == GST_FLOW_OK) {
2577 if (parse->segment.rate > 0.0) {
2578 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2579 size);
2580 ret = gst_pad_push (parse->srcpad, buffer);
2581 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2582 } else if (!parse->priv->disable_passthrough && parse->priv->passthrough) {
2583
2584 /* in backwards playback mode, if on passthrough we need to push buffers
2585 * directly without accumulating them into the buffers_queued as baseparse
2586 * will never check for a DISCONT while on passthrough and those buffers
2587 * will never be pushed.
2588 *
2589 * also, as we are on reverse playback, it might be possible that
2590 * passthrough might have just been enabled, so make sure to drain the
2591 * buffers_queued list */
2592 if (G_UNLIKELY (parse->priv->buffers_queued != NULL)) {
2593 gst_base_parse_finish_fragment (parse, TRUE);
2594 ret = gst_base_parse_send_buffers (parse);
2595 }
2596
2597 if (ret == GST_FLOW_OK) {
2598 GST_LOG_OBJECT (parse,
2599 "pushing frame (%" G_GSIZE_FORMAT " bytes) now..", size);
2600 ret = gst_pad_push (parse->srcpad, buffer);
2601 GST_LOG_OBJECT (parse, "frame pushed, flow %s",
2602 gst_flow_get_name (ret));
2603 } else {
2604 GST_LOG_OBJECT (parse,
2605 "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s", size,
2606 gst_flow_get_name (ret));
2607 gst_buffer_unref (buffer);
2608 }
2609
2610 } else {
2611 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2612 size);
2613 parse->priv->buffers_queued =
2614 g_slist_prepend (parse->priv->buffers_queued, buffer);
2615 ret = GST_FLOW_OK;
2616 }
2617 } else {
2618 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2619 size, gst_flow_get_name (ret));
2620 gst_buffer_unref (buffer);
2621 /* if we are not sufficiently in control, let upstream decide on EOS */
2622 if (ret == GST_FLOW_EOS && !parse->priv->disable_passthrough &&
2623 (parse->priv->passthrough ||
2624 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2625 !parse->priv->upstream_seekable)))
2626 ret = GST_FLOW_OK;
2627 }
2628
2629 /* Update current running segment position */
2630 if ((ret == GST_FLOW_OK || ret == GST_FLOW_NOT_LINKED)
2631 && last_stop != GST_CLOCK_TIME_NONE
2632 && parse->segment.position < last_stop)
2633 parse->segment.position = last_stop;
2634
2635 return ret;
2636
2637 /* ERRORS */
2638 no_caps:
2639 {
2640 if (GST_PAD_IS_FLUSHING (parse->srcpad))
2641 return GST_FLOW_FLUSHING;
2642
2643 GST_ELEMENT_ERROR (parse, STREAM, DECODE, ("No caps set"), (NULL));
2644 return GST_FLOW_ERROR;
2645 }
2646 }
2647
2648 /**
2649 * gst_base_parse_finish_frame:
2650 * @parse: a #GstBaseParse
2651 * @frame: a #GstBaseParseFrame
2652 * @size: consumed input data represented by frame
2653 *
2654 * Collects parsed data and pushes this downstream.
2655 * Source pad caps must be set when this is called.
2656 *
2657 * If @frame's out_buffer is set, that will be used as subsequent frame data.
2658 * Otherwise, @size samples will be taken from the input and used for output,
2659 * and the output's metadata (timestamps etc) will be taken as (optionally)
2660 * set by the subclass on @frame's (input) buffer (which is otherwise
2661 * ignored for any but the above purpose/information).
2662 *
2663 * Note that the latter buffer is invalidated by this call, whereas the
2664 * caller retains ownership of @frame.
2665 *
2666 * Returns: a #GstFlowReturn that should be escalated to caller (of caller)
2667 */
2668 GstFlowReturn
gst_base_parse_finish_frame(GstBaseParse * parse,GstBaseParseFrame * frame,gint size)2669 gst_base_parse_finish_frame (GstBaseParse * parse, GstBaseParseFrame * frame,
2670 gint size)
2671 {
2672 GstFlowReturn ret = GST_FLOW_OK;
2673
2674 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2675 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
2676 g_return_val_if_fail (size > 0 || frame->out_buffer, GST_FLOW_ERROR);
2677 g_return_val_if_fail (gst_adapter_available (parse->priv->adapter) >= size,
2678 GST_FLOW_ERROR);
2679
2680 GST_LOG_OBJECT (parse, "finished frame at offset %" G_GUINT64_FORMAT ", "
2681 "flushing size %d", frame->offset, size);
2682
2683 /* some one-time start-up */
2684 if (G_UNLIKELY (parse->priv->framecount == 0)) {
2685 gst_base_parse_check_seekability (parse);
2686 gst_base_parse_check_upstream (parse);
2687 }
2688
2689 parse->priv->flushed += size;
2690
2691 if (parse->priv->scanning && frame->buffer) {
2692 if (!parse->priv->scanned_frame) {
2693 parse->priv->scanned_frame = gst_base_parse_frame_copy (frame);
2694 }
2695 goto exit;
2696 }
2697
2698 /* either PUSH or PULL mode arranges for adapter data */
2699 /* ensure output buffer */
2700 if (!frame->out_buffer) {
2701 GstBuffer *src, *dest;
2702
2703 frame->out_buffer = gst_adapter_take_buffer (parse->priv->adapter, size);
2704 dest = frame->out_buffer;
2705 src = frame->buffer;
2706 GST_BUFFER_PTS (dest) = GST_BUFFER_PTS (src);
2707 GST_BUFFER_DTS (dest) = GST_BUFFER_DTS (src);
2708 GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src);
2709 GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src);
2710 GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src);
2711 GST_MINI_OBJECT_FLAGS (dest) = GST_MINI_OBJECT_FLAGS (src);
2712 } else {
2713 gst_adapter_flush (parse->priv->adapter, size);
2714 }
2715
2716 /* use as input for subsequent processing */
2717 gst_buffer_replace (&frame->buffer, frame->out_buffer);
2718 gst_buffer_unref (frame->out_buffer);
2719 frame->out_buffer = NULL;
2720
2721 /* mark input size consumed */
2722 frame->size = size;
2723
2724 /* subclass might queue frames/data internally if it needs more
2725 * frames to decide on the format, or might request us to queue here. */
2726 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_DROP) {
2727 gst_buffer_replace (&frame->buffer, NULL);
2728 goto exit;
2729 } else if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_QUEUE) {
2730 GstBaseParseFrame *copy;
2731
2732 copy = gst_base_parse_frame_copy (frame);
2733 copy->flags &= ~GST_BASE_PARSE_FRAME_FLAG_QUEUE;
2734 gst_base_parse_queue_frame (parse, copy);
2735 goto exit;
2736 }
2737
2738 ret = gst_base_parse_handle_and_push_frame (parse, frame);
2739
2740 exit:
2741 return ret;
2742 }
2743
2744 /**
2745 * gst_base_parse_drain:
2746 * @parse: a #GstBaseParse
2747 *
2748 * Drains the adapter until it is empty. It decreases the min_frame_size to
2749 * match the current adapter size and calls chain method until the adapter
2750 * is emptied or chain returns with error.
2751 *
2752 * Since: 1.12
2753 */
2754 void
gst_base_parse_drain(GstBaseParse * parse)2755 gst_base_parse_drain (GstBaseParse * parse)
2756 {
2757 guint avail;
2758
2759 GST_DEBUG_OBJECT (parse, "draining");
2760 parse->priv->drain = TRUE;
2761
2762 for (;;) {
2763 avail = gst_adapter_available (parse->priv->adapter);
2764 if (!avail)
2765 break;
2766
2767 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2768 NULL) != GST_FLOW_OK) {
2769 break;
2770 }
2771
2772 /* nothing changed, maybe due to truncated frame; break infinite loop */
2773 if (avail == gst_adapter_available (parse->priv->adapter)) {
2774 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2775 gst_adapter_clear (parse->priv->adapter);
2776 }
2777 }
2778
2779 parse->priv->drain = FALSE;
2780 }
2781
2782 /* gst_base_parse_send_buffers
2783 *
2784 * Sends buffers collected in send_buffers downstream, and ensures that list
2785 * is empty at the end (errors or not).
2786 */
2787 static GstFlowReturn
gst_base_parse_send_buffers(GstBaseParse * parse)2788 gst_base_parse_send_buffers (GstBaseParse * parse)
2789 {
2790 GSList *send = NULL;
2791 GstBuffer *buf;
2792 GstFlowReturn ret = GST_FLOW_OK;
2793 gboolean first = TRUE;
2794
2795 send = parse->priv->buffers_send;
2796
2797 /* send buffers */
2798 while (send) {
2799 buf = GST_BUFFER_CAST (send->data);
2800 GST_LOG_OBJECT (parse, "pushing buffer %p, dts %"
2801 GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2802 ", offset %" G_GINT64_FORMAT, buf,
2803 GST_TIME_ARGS (GST_BUFFER_DTS (buf)),
2804 GST_TIME_ARGS (GST_BUFFER_PTS (buf)),
2805 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2806
2807 /* Make sure the first buffer is always DISCONT. If we split
2808 * GOPs inside the parser this is otherwise not guaranteed */
2809 if (first) {
2810 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
2811 first = FALSE;
2812 } else {
2813 /* likewise, subsequent buffers should never have DISCONT
2814 * according to the "reverse fragment protocol", or such would
2815 * confuse a downstream decoder
2816 * (could be DISCONT due to aggregating upstream fragments by parsing) */
2817 GST_BUFFER_FLAG_UNSET (buf, GST_BUFFER_FLAG_DISCONT);
2818 }
2819
2820 /* iterate output queue an push downstream */
2821 ret = gst_pad_push (parse->srcpad, buf);
2822 send = g_slist_delete_link (send, send);
2823
2824 /* clear any leftover if error */
2825 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2826 while (send) {
2827 buf = GST_BUFFER_CAST (send->data);
2828 gst_buffer_unref (buf);
2829 send = g_slist_delete_link (send, send);
2830 }
2831 }
2832 }
2833
2834 parse->priv->buffers_send = send;
2835
2836 return ret;
2837 }
2838
2839 /* gst_base_parse_start_fragment:
2840 *
2841 * Prepares for processing a reverse playback (forward) fragment
2842 * by (re)setting proper state variables.
2843 */
2844 static GstFlowReturn
gst_base_parse_start_fragment(GstBaseParse * parse)2845 gst_base_parse_start_fragment (GstBaseParse * parse)
2846 {
2847 GST_LOG_OBJECT (parse, "starting fragment");
2848
2849 /* invalidate so no fall-back timestamping is performed;
2850 * ok if taken from subclass or upstream */
2851 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
2852 parse->priv->prev_pts = GST_CLOCK_TIME_NONE;
2853 parse->priv->next_dts = GST_CLOCK_TIME_NONE;
2854 parse->priv->prev_dts = GST_CLOCK_TIME_NONE;
2855 parse->priv->prev_dts_from_pts = FALSE;
2856 /* prevent it hanging around stop all the time */
2857 parse->segment.position = GST_CLOCK_TIME_NONE;
2858 /* mark next run */
2859 parse->priv->discont = TRUE;
2860
2861 /* head of previous fragment is now pending tail of current fragment */
2862 parse->priv->buffers_pending = parse->priv->buffers_head;
2863 parse->priv->buffers_head = NULL;
2864
2865 return GST_FLOW_OK;
2866 }
2867
2868
2869 /* gst_base_parse_finish_fragment:
2870 *
2871 * Processes a reverse playback (forward) fragment:
2872 * - append head of last fragment that was skipped to current fragment data
2873 * - drain the resulting current fragment data (i.e. repeated chain)
2874 * - add time/duration (if needed) to frames queued by chain
2875 * - push queued data
2876 */
2877 static GstFlowReturn
gst_base_parse_finish_fragment(GstBaseParse * parse,gboolean prev_head)2878 gst_base_parse_finish_fragment (GstBaseParse * parse, gboolean prev_head)
2879 {
2880 GstBuffer *buf;
2881 GstFlowReturn ret = GST_FLOW_OK;
2882 gboolean seen_key = FALSE, seen_delta = FALSE;
2883
2884 GST_LOG_OBJECT (parse, "finishing fragment");
2885
2886 /* restore order */
2887 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2888 while (parse->priv->buffers_pending) {
2889 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2890 if (prev_head) {
2891 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2892 gst_buffer_get_size (buf));
2893 gst_adapter_push (parse->priv->adapter, buf);
2894 } else {
2895 GST_LOG_OBJECT (parse, "discarding head buffer");
2896 gst_buffer_unref (buf);
2897 }
2898 parse->priv->buffers_pending =
2899 g_slist_delete_link (parse->priv->buffers_pending,
2900 parse->priv->buffers_pending);
2901 }
2902
2903 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2904 /* initial skipped data is added to buffers_pending */
2905 gst_base_parse_drain (parse);
2906
2907 if (parse->priv->buffers_send) {
2908 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2909 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2910 }
2911
2912 /* add metadata (if needed to queued buffers */
2913 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2914 GST_TIME_ARGS (parse->priv->last_pts));
2915 while (parse->priv->buffers_queued) {
2916 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2917
2918 /* no touching if upstream or parsing provided time */
2919 if (GST_BUFFER_PTS_IS_VALID (buf)) {
2920 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2921 GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
2922 } else if (GST_BUFFER_DURATION_IS_VALID (buf)) {
2923 if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_pts)) {
2924 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_pts))
2925 parse->priv->last_pts -= GST_BUFFER_DURATION (buf);
2926 else
2927 parse->priv->last_pts = 0;
2928 GST_BUFFER_PTS (buf) = parse->priv->last_pts;
2929 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2930 GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
2931 }
2932 if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_dts)) {
2933 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_dts))
2934 parse->priv->last_dts -= GST_BUFFER_DURATION (buf);
2935 else
2936 parse->priv->last_dts = 0;
2937 GST_BUFFER_DTS (buf) = parse->priv->last_dts;
2938 GST_LOG_OBJECT (parse, "applied dts %" GST_TIME_FORMAT,
2939 GST_TIME_ARGS (GST_BUFFER_DTS (buf)));
2940 }
2941 } else {
2942 /* no idea, very bad */
2943 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2944 }
2945
2946 parse->priv->last_pts = GST_BUFFER_PTS (buf);
2947 parse->priv->last_dts = GST_BUFFER_DTS (buf);
2948
2949 /* reverse order for ascending sending */
2950 /* send downstream at keyframe not preceded by a keyframe
2951 * (e.g. that should identify start of collection of IDR nals) */
2952 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2953 if (seen_key) {
2954 ret = gst_base_parse_send_buffers (parse);
2955 /* if a problem, throw all to sending */
2956 if (ret != GST_FLOW_OK) {
2957 parse->priv->buffers_send =
2958 g_slist_reverse (parse->priv->buffers_queued);
2959 parse->priv->buffers_queued = NULL;
2960 break;
2961 }
2962 seen_key = FALSE;
2963 }
2964 seen_delta = TRUE;
2965 } else {
2966 seen_key = TRUE;
2967 }
2968
2969 parse->priv->buffers_send =
2970 g_slist_prepend (parse->priv->buffers_send, buf);
2971 parse->priv->buffers_queued =
2972 g_slist_delete_link (parse->priv->buffers_queued,
2973 parse->priv->buffers_queued);
2974 }
2975
2976 /* audio may have all marked as keyframe, so arrange to send here. Also
2977 * we might have ended the loop above on a keyframe, in which case we
2978 * should */
2979 if (!seen_delta || seen_key)
2980 ret = gst_base_parse_send_buffers (parse);
2981
2982 /* any trailing unused no longer usable (ideally none) */
2983 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2984 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2985 gst_adapter_available (parse->priv->adapter));
2986 gst_adapter_clear (parse->priv->adapter);
2987 }
2988
2989 return ret;
2990 }
2991
2992 /* small helper that checks whether we have been trying to resync too long */
2993 static inline GstFlowReturn
gst_base_parse_check_sync(GstBaseParse * parse)2994 gst_base_parse_check_sync (GstBaseParse * parse)
2995 {
2996 if (G_UNLIKELY (parse->priv->discont &&
2997 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2998 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2999 ("Failed to parse stream"), (NULL));
3000 return GST_FLOW_ERROR;
3001 }
3002
3003 return GST_FLOW_OK;
3004 }
3005
3006 static GstFlowReturn
gst_base_parse_process_streamheader(GstBaseParse * parse)3007 gst_base_parse_process_streamheader (GstBaseParse * parse)
3008 {
3009 GstCaps *caps;
3010 GstStructure *str;
3011 const GValue *value;
3012 GstFlowReturn ret = GST_FLOW_OK;
3013
3014 caps = gst_pad_get_current_caps (GST_BASE_PARSE_SINK_PAD (parse));
3015 if (caps == NULL)
3016 goto notfound;
3017
3018 str = gst_caps_get_structure (caps, 0);
3019 value = gst_structure_get_value (str, "streamheader");
3020 if (value == NULL)
3021 goto notfound;
3022
3023 GST_DEBUG_OBJECT (parse, "Found streamheader field on input caps");
3024
3025 if (GST_VALUE_HOLDS_ARRAY (value)) {
3026 gint i;
3027 gsize len = gst_value_array_get_size (value);
3028
3029 for (i = 0; i < len; i++) {
3030 GstBuffer *buffer =
3031 gst_value_get_buffer (gst_value_array_get_value (value, i));
3032 ret =
3033 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
3034 GST_OBJECT_CAST (parse), gst_buffer_ref (buffer));
3035 }
3036
3037 } else if (GST_VALUE_HOLDS_BUFFER (value)) {
3038 GstBuffer *buffer = gst_value_get_buffer (value);
3039 ret =
3040 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
3041 GST_OBJECT_CAST (parse), gst_buffer_ref (buffer));
3042 }
3043
3044 gst_caps_unref (caps);
3045
3046 return ret;
3047
3048 notfound:
3049 {
3050 if (caps) {
3051 gst_caps_unref (caps);
3052 }
3053
3054 GST_DEBUG_OBJECT (parse, "No streamheader on caps");
3055 return GST_FLOW_OK;
3056 }
3057 }
3058
3059 static GstFlowReturn
gst_base_parse_chain(GstPad * pad,GstObject * parent,GstBuffer * buffer)3060 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
3061 {
3062 GstBaseParseClass *bclass;
3063 GstBaseParse *parse;
3064 GstFlowReturn ret = GST_FLOW_OK;
3065 GstFlowReturn old_ret = GST_FLOW_OK;
3066 GstBuffer *tmpbuf = NULL;
3067 guint fsize = 1;
3068 gint skip = -1;
3069 guint min_size, av;
3070 GstClockTime pts, dts;
3071
3072 parse = GST_BASE_PARSE (parent);
3073 bclass = GST_BASE_PARSE_GET_CLASS (parse);
3074 GST_DEBUG_OBJECT (parent, "chain");
3075
3076 /* early out for speed, if we need to skip */
3077 if (buffer && GST_BUFFER_IS_DISCONT (buffer))
3078 parse->priv->skip = 0;
3079 if (parse->priv->skip > 0) {
3080 gsize bsize = gst_buffer_get_size (buffer);
3081 GST_DEBUG ("Got %" G_GSIZE_FORMAT " buffer, need to skip %u", bsize,
3082 parse->priv->skip);
3083 if (parse->priv->skip >= bsize) {
3084 parse->priv->skip -= bsize;
3085 GST_DEBUG ("All the buffer is skipped");
3086 parse->priv->offset += bsize;
3087 parse->priv->sync_offset = parse->priv->offset;
3088 return GST_FLOW_OK;
3089 }
3090 buffer = gst_buffer_make_writable (buffer);
3091 gst_buffer_resize (buffer, parse->priv->skip, bsize - parse->priv->skip);
3092 parse->priv->offset += parse->priv->skip;
3093 GST_DEBUG ("Done skipping, we have %u left on this buffer",
3094 (unsigned) (bsize - parse->priv->skip));
3095 parse->priv->skip = 0;
3096 parse->priv->discont = TRUE;
3097 }
3098
3099 if (G_UNLIKELY (parse->priv->first_buffer)) {
3100 parse->priv->first_buffer = FALSE;
3101 if (!GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_HEADER)) {
3102 /* this stream has no header buffers, check if we just prepend the
3103 * streamheader from caps to the stream */
3104 GST_DEBUG_OBJECT (parse, "Looking for streamheader field on caps to "
3105 "prepend to the stream");
3106 gst_base_parse_process_streamheader (parse);
3107 } else {
3108 GST_DEBUG_OBJECT (parse, "Stream has header buffers, not prepending "
3109 "streamheader from caps");
3110 }
3111 }
3112
3113 if (parse->priv->detecting) {
3114 GstBuffer *detect_buf;
3115
3116 if (parse->priv->detect_buffers_size == 0) {
3117 detect_buf = gst_buffer_ref (buffer);
3118 } else {
3119 GList *l;
3120 guint offset = 0;
3121
3122 detect_buf = gst_buffer_new ();
3123
3124 for (l = parse->priv->detect_buffers; l; l = l->next) {
3125 gsize tmpsize = gst_buffer_get_size (l->data);
3126
3127 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
3128 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
3129 offset += tmpsize;
3130 }
3131 if (buffer)
3132 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
3133 offset, gst_buffer_get_size (buffer));
3134 }
3135
3136 ret = bclass->detect (parse, detect_buf);
3137 gst_buffer_unref (detect_buf);
3138
3139 if (ret == GST_FLOW_OK) {
3140 GList *l;
3141
3142 /* Detected something */
3143 parse->priv->detecting = FALSE;
3144
3145 for (l = parse->priv->detect_buffers; l; l = l->next) {
3146 if (ret == GST_FLOW_OK && !parse->priv->flushing)
3147 ret =
3148 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
3149 parent, GST_BUFFER_CAST (l->data));
3150 else
3151 gst_buffer_unref (GST_BUFFER_CAST (l->data));
3152 }
3153 g_list_free (parse->priv->detect_buffers);
3154 parse->priv->detect_buffers = NULL;
3155 parse->priv->detect_buffers_size = 0;
3156
3157 if (ret != GST_FLOW_OK) {
3158 return ret;
3159 }
3160
3161 /* Handle the current buffer */
3162 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
3163 /* Still detecting, append buffer or error out if draining */
3164
3165 if (parse->priv->drain) {
3166 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
3167 return GST_FLOW_ERROR;
3168 } else if (parse->priv->flushing) {
3169 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
3170 NULL);
3171 g_list_free (parse->priv->detect_buffers);
3172 parse->priv->detect_buffers = NULL;
3173 parse->priv->detect_buffers_size = 0;
3174 } else {
3175 parse->priv->detect_buffers =
3176 g_list_append (parse->priv->detect_buffers, buffer);
3177 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
3178 return GST_FLOW_OK;
3179 }
3180 } else {
3181 /* Something went wrong, subclass responsible for error reporting */
3182 return ret;
3183 }
3184
3185 /* And now handle the current buffer if detection worked */
3186 }
3187
3188 if (G_LIKELY (buffer)) {
3189 GST_LOG_OBJECT (parse,
3190 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT
3191 ", dts %" GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT,
3192 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer),
3193 GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
3194 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)));
3195
3196 if (G_UNLIKELY (!parse->priv->disable_passthrough
3197 && parse->priv->passthrough)) {
3198 GstBaseParseFrame frame;
3199
3200 gst_base_parse_frame_init (&frame);
3201 frame.buffer = gst_buffer_make_writable (buffer);
3202 ret = gst_base_parse_push_frame (parse, &frame);
3203 gst_base_parse_frame_free (&frame);
3204 return ret;
3205 }
3206 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
3207 /* upstream feeding us in reverse playback;
3208 * finish previous fragment and start new upon DISCONT */
3209 if (parse->segment.rate < 0.0) {
3210 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
3211 ret = gst_base_parse_finish_fragment (parse, TRUE);
3212 gst_base_parse_start_fragment (parse);
3213 } else {
3214 /* discont in the stream, drain and mark discont for next output */
3215 gst_base_parse_drain (parse);
3216 parse->priv->discont = TRUE;
3217 }
3218 }
3219 gst_adapter_push (parse->priv->adapter, buffer);
3220 }
3221
3222 /* Parse and push as many frames as possible */
3223 /* Stop either when adapter is empty or we are flushing */
3224 while (!parse->priv->flushing) {
3225 gint flush = 0;
3226 gboolean updated_prev_pts = FALSE;
3227
3228 /* note: if subclass indicates MAX fsize,
3229 * this will not likely be available anyway ... */
3230 min_size = MAX (parse->priv->min_frame_size, fsize);
3231 av = gst_adapter_available (parse->priv->adapter);
3232
3233 if (G_UNLIKELY (parse->priv->drain)) {
3234 min_size = av;
3235 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
3236 if (G_UNLIKELY (!min_size)) {
3237 goto done;
3238 }
3239 }
3240
3241 /* Collect at least min_frame_size bytes */
3242 if (av < min_size) {
3243 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)", av);
3244 goto done;
3245 }
3246
3247 /* move along with upstream timestamp (if any),
3248 * but interpolate in between */
3249 pts = gst_adapter_prev_pts (parse->priv->adapter, NULL);
3250 dts = gst_adapter_prev_dts (parse->priv->adapter, NULL);
3251 if (GST_CLOCK_TIME_IS_VALID (pts) && (parse->priv->prev_pts != pts)) {
3252 parse->priv->prev_pts = parse->priv->next_pts = pts;
3253 updated_prev_pts = TRUE;
3254 }
3255
3256 if (GST_CLOCK_TIME_IS_VALID (dts) && (parse->priv->prev_dts != dts)) {
3257 parse->priv->prev_dts = parse->priv->next_dts = dts;
3258 parse->priv->prev_dts_from_pts = FALSE;
3259 }
3260
3261 /* we can mess with, erm interpolate, timestamps,
3262 * and incoming stuff has PTS but no DTS seen so far,
3263 * then pick up DTS from PTS and hope for the best ... */
3264 if (parse->priv->infer_ts &&
3265 parse->priv->pts_interpolate &&
3266 !GST_CLOCK_TIME_IS_VALID (dts) &&
3267 (!GST_CLOCK_TIME_IS_VALID (parse->priv->prev_dts)
3268 || (parse->priv->prev_dts_from_pts && updated_prev_pts))
3269 && GST_CLOCK_TIME_IS_VALID (pts)) {
3270 parse->priv->prev_dts = parse->priv->next_dts = pts;
3271 parse->priv->prev_dts_from_pts = TRUE;
3272 }
3273
3274 /* always pass all available data */
3275 tmpbuf = gst_adapter_get_buffer (parse->priv->adapter, av);
3276
3277 /* already inform subclass what timestamps we have planned,
3278 * at least if provided by time-based upstream */
3279 if (parse->priv->upstream_format == GST_FORMAT_TIME) {
3280 tmpbuf = gst_buffer_make_writable (tmpbuf);
3281 GST_BUFFER_PTS (tmpbuf) = parse->priv->next_pts;
3282 GST_BUFFER_DTS (tmpbuf) = parse->priv->next_dts;
3283 GST_BUFFER_DURATION (tmpbuf) = GST_CLOCK_TIME_NONE;
3284 }
3285
3286 /* keep the adapter mapped, so keep track of what has to be flushed */
3287 ret = gst_base_parse_handle_buffer (parse, tmpbuf, &skip, &flush);
3288 tmpbuf = NULL;
3289
3290 if (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED) {
3291 goto done;
3292 }
3293 if (skip == 0 && flush == 0) {
3294 GST_LOG_OBJECT (parse, "nothing skipped and no frames finished, "
3295 "breaking to get more data");
3296 /* ignore this return as it produced no data */
3297 ret = old_ret;
3298 goto done;
3299 }
3300 if (old_ret == GST_FLOW_OK)
3301 old_ret = ret;
3302 }
3303
3304 done:
3305 GST_LOG_OBJECT (parse, "chain leaving");
3306 return ret;
3307 }
3308
3309 /* pull @size bytes at current offset,
3310 * i.e. at least try to and possibly return a shorter buffer if near the end */
3311 static GstFlowReturn
gst_base_parse_pull_range(GstBaseParse * parse,guint size,GstBuffer ** buffer)3312 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
3313 GstBuffer ** buffer)
3314 {
3315 GstFlowReturn ret = GST_FLOW_OK;
3316
3317 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
3318
3319 /* Caching here actually makes much less difference than one would expect.
3320 * We do it mainly to avoid pulling buffers of 1 byte all the time */
3321 if (parse->priv->cache) {
3322 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
3323 gint cache_size = gst_buffer_get_size (parse->priv->cache);
3324
3325 if (cache_offset <= parse->priv->offset &&
3326 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
3327 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
3328 parse->priv->offset - cache_offset, size);
3329 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
3330 return GST_FLOW_OK;
3331 }
3332 /* not enough data in the cache, free cache and get a new one */
3333 gst_buffer_unref (parse->priv->cache);
3334 parse->priv->cache = NULL;
3335 }
3336
3337 /* refill the cache */
3338 ret =
3339 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
3340 64 * 1024), &parse->priv->cache);
3341 if (ret != GST_FLOW_OK) {
3342 parse->priv->cache = NULL;
3343 return ret;
3344 }
3345
3346 if (gst_buffer_get_size (parse->priv->cache) < size) {
3347 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
3348 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
3349 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
3350
3351 *buffer = parse->priv->cache;
3352 parse->priv->cache = NULL;
3353
3354 return GST_FLOW_OK;
3355 }
3356
3357 *buffer =
3358 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
3359 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
3360
3361 return GST_FLOW_OK;
3362 }
3363
3364 static GstFlowReturn
gst_base_parse_handle_previous_fragment(GstBaseParse * parse)3365 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
3366 {
3367 gint64 offset = 0;
3368 GstClockTime ts = 0;
3369 GstBuffer *buffer;
3370 GstFlowReturn ret;
3371
3372 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
3373 ", last_offset = %" G_GINT64_FORMAT,
3374 GST_TIME_ARGS (parse->priv->last_pts), parse->priv->last_offset);
3375
3376 if (!parse->priv->last_offset
3377 || parse->priv->last_pts <= parse->segment.start) {
3378 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
3379 GST_TIME_ARGS (parse->segment.start));
3380 ret = GST_FLOW_EOS;
3381 goto exit;
3382 }
3383
3384 /* last fragment started at last_offset / last_ts;
3385 * seek back 10s capped at 1MB */
3386 if (parse->priv->last_pts >= 10 * GST_SECOND)
3387 ts = parse->priv->last_pts - 10 * GST_SECOND;
3388 /* if we are exact now, we will be more so going backwards */
3389 if (parse->priv->exact_position) {
3390 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
3391 } else {
3392 if (!gst_base_parse_convert (parse, GST_FORMAT_TIME, ts,
3393 GST_FORMAT_BYTES, &offset)) {
3394 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
3395 }
3396 }
3397 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
3398 parse->priv->last_offset - 1024);
3399 offset = MAX (0, offset);
3400
3401 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
3402 offset);
3403 parse->priv->offset = offset;
3404
3405 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
3406 &buffer);
3407 if (ret != GST_FLOW_OK)
3408 goto exit;
3409
3410 /* offset will increase again as fragment is processed/parsed */
3411 parse->priv->last_offset = offset;
3412
3413 gst_base_parse_start_fragment (parse);
3414 gst_adapter_push (parse->priv->adapter, buffer);
3415 ret = gst_base_parse_finish_fragment (parse, TRUE);
3416 if (ret != GST_FLOW_OK)
3417 goto exit;
3418
3419 /* force previous fragment */
3420 parse->priv->offset = -1;
3421
3422 exit:
3423 return ret;
3424 }
3425
3426 /* PULL mode:
3427 * pull and scan for next frame starting from current offset
3428 * ajusts sync, drain and offset going along */
3429 static GstFlowReturn
gst_base_parse_scan_frame(GstBaseParse * parse,GstBaseParseClass * klass)3430 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass)
3431 {
3432 GstBuffer *buffer;
3433 GstFlowReturn ret = GST_FLOW_OK;
3434 guint fsize, min_size;
3435 gint flushed = 0;
3436 gint skip = 0;
3437
3438 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
3439 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
3440
3441 /* let's make this efficient for all subclass once and for all;
3442 * maybe it does not need this much, but in the latter case, we know we are
3443 * in pull mode here and might as well try to read and supply more anyway
3444 * (so does the buffer caching mechanism) */
3445 fsize = 64 * 1024;
3446
3447 while (TRUE) {
3448 min_size = MAX (parse->priv->min_frame_size, fsize);
3449
3450 GST_LOG_OBJECT (parse, "reading buffer size %u", min_size);
3451
3452 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
3453 if (ret != GST_FLOW_OK)
3454 goto done;
3455
3456 /* if we got a short read, inform subclass we are draining leftover
3457 * and no more is to be expected */
3458 if (gst_buffer_get_size (buffer) < min_size) {
3459 GST_LOG_OBJECT (parse, "... but did not get that; marked draining");
3460 parse->priv->drain = TRUE;
3461 }
3462
3463 if (parse->priv->detecting) {
3464 ret = klass->detect (parse, buffer);
3465 if (ret == GST_FLOW_NOT_NEGOTIATED) {
3466 /* If draining we error out, otherwise request a buffer
3467 * with 64kb more */
3468 if (parse->priv->drain) {
3469 gst_buffer_unref (buffer);
3470 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
3471 return GST_FLOW_ERROR;
3472 } else {
3473 fsize += 64 * 1024;
3474 gst_buffer_unref (buffer);
3475 continue;
3476 }
3477 } else if (ret != GST_FLOW_OK) {
3478 gst_buffer_unref (buffer);
3479 GST_ERROR_OBJECT (parse, "detect() returned %s",
3480 gst_flow_get_name (ret));
3481 return ret;
3482 }
3483
3484 /* Else handle this buffer normally */
3485 }
3486
3487 ret = gst_base_parse_handle_buffer (parse, buffer, &skip, &flushed);
3488 if (ret != GST_FLOW_OK)
3489 break;
3490
3491 /* If a large amount of data was requested to be skipped, _handle_buffer
3492 might have set the priv->skip flag to an extra amount on top of skip.
3493 In pull mode, we can just pull from the new offset directly. */
3494 parse->priv->offset += parse->priv->skip;
3495 parse->priv->skip = 0;
3496
3497 /* something flushed means something happened,
3498 * and we should bail out of this loop so as not to occupy
3499 * the task thread indefinitely */
3500 if (flushed) {
3501 GST_LOG_OBJECT (parse, "frame finished, breaking loop");
3502 break;
3503 }
3504 /* nothing flushed, no skip and draining, so nothing left to do */
3505 if (!skip && parse->priv->drain) {
3506 GST_LOG_OBJECT (parse, "no activity or result when draining; "
3507 "breaking loop and marking EOS");
3508 ret = GST_FLOW_EOS;
3509 break;
3510 }
3511 /* otherwise, get some more data
3512 * note that is checked this does not happen indefinitely */
3513 if (!skip) {
3514 GST_LOG_OBJECT (parse, "getting some more data");
3515 fsize += 64 * 1024;
3516 }
3517 parse->priv->drain = FALSE;
3518 }
3519
3520 done:
3521 return ret;
3522 }
3523
3524 /* Loop that is used in pull mode to retrieve data from upstream */
3525 static void
gst_base_parse_loop(GstPad * pad)3526 gst_base_parse_loop (GstPad * pad)
3527 {
3528 GstBaseParse *parse;
3529 GstBaseParseClass *klass;
3530 GstFlowReturn ret = GST_FLOW_OK;
3531
3532 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
3533 klass = GST_BASE_PARSE_GET_CLASS (parse);
3534
3535 GST_LOG_OBJECT (parse, "Entering parse loop");
3536
3537 if (G_UNLIKELY (parse->priv->push_stream_start)) {
3538 gchar *stream_id;
3539 GstEvent *event;
3540
3541 stream_id =
3542 gst_pad_create_stream_id (parse->srcpad, GST_ELEMENT_CAST (parse),
3543 NULL);
3544
3545 event = gst_event_new_stream_start (stream_id);
3546 gst_event_set_group_id (event, gst_util_group_id_next ());
3547
3548 GST_DEBUG_OBJECT (parse, "Pushing STREAM_START");
3549 gst_pad_push_event (parse->srcpad, event);
3550 parse->priv->push_stream_start = FALSE;
3551 g_free (stream_id);
3552 }
3553
3554 /* reverse playback:
3555 * first fragment (closest to stop time) is handled normally below,
3556 * then we pull in fragments going backwards */
3557 if (parse->segment.rate < 0.0) {
3558 /* check if we jumped back to a previous fragment,
3559 * which is a post-first fragment */
3560 if (parse->priv->offset < 0) {
3561 ret = gst_base_parse_handle_previous_fragment (parse);
3562 goto done;
3563 }
3564 }
3565
3566 ret = gst_base_parse_scan_frame (parse, klass);
3567
3568 /* eat expected eos signalling past segment in reverse playback */
3569 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
3570 parse->segment.position >= parse->segment.stop) {
3571 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
3572 /* push what was accumulated during loop run */
3573 gst_base_parse_finish_fragment (parse, FALSE);
3574 /* force previous fragment */
3575 parse->priv->offset = -1;
3576 goto eos;
3577 }
3578
3579 if (ret != GST_FLOW_OK)
3580 goto done;
3581
3582 done:
3583 if (ret == GST_FLOW_EOS)
3584 goto eos;
3585 else if (ret != GST_FLOW_OK)
3586 goto pause;
3587
3588 gst_object_unref (parse);
3589 return;
3590
3591 /* ERRORS */
3592 eos:
3593 {
3594 ret = GST_FLOW_EOS;
3595 GST_DEBUG_OBJECT (parse, "eos");
3596 /* fall-through */
3597 }
3598 pause:
3599 {
3600 gboolean push_eos = FALSE;
3601
3602 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
3603 gst_flow_get_name (ret));
3604 gst_pad_pause_task (parse->sinkpad);
3605
3606 if (ret == GST_FLOW_EOS) {
3607 /* handle end-of-stream/segment */
3608 if (parse->segment.flags & GST_SEGMENT_FLAG_SEGMENT) {
3609 gint64 stop;
3610
3611 if ((stop = parse->segment.stop) == -1)
3612 stop = parse->segment.duration;
3613
3614 GST_DEBUG_OBJECT (parse, "sending segment_done");
3615
3616 gst_element_post_message
3617 (GST_ELEMENT_CAST (parse),
3618 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
3619 GST_FORMAT_TIME, stop));
3620 gst_pad_push_event (parse->srcpad,
3621 gst_event_new_segment_done (GST_FORMAT_TIME, stop));
3622 } else {
3623 /* If we STILL have zero frames processed, fire an error */
3624 if (parse->priv->framecount == 0) {
3625 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
3626 ("No valid frames found before end of stream"), (NULL));
3627 }
3628 push_eos = TRUE;
3629 }
3630 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
3631 /* for fatal errors we post an error message, wrong-state is
3632 * not fatal because it happens due to flushes and only means
3633 * that we should stop now. */
3634 GST_ELEMENT_FLOW_ERROR (parse, ret);
3635 push_eos = TRUE;
3636 }
3637 if (push_eos) {
3638 GstEvent *topush;
3639 if (parse->priv->estimated_duration <= 0) {
3640 gst_base_parse_update_duration (parse);
3641 }
3642 /* Push pending events, including SEGMENT events */
3643 gst_base_parse_push_pending_events (parse);
3644
3645 topush = gst_event_new_eos ();
3646 GST_DEBUG_OBJECT (parse, "segment_seqnum:%" G_GUINT32_FORMAT,
3647 parse->priv->segment_seqnum);
3648 if (parse->priv->segment_seqnum != GST_SEQNUM_INVALID)
3649 gst_event_set_seqnum (topush, parse->priv->segment_seqnum);
3650 gst_pad_push_event (parse->srcpad, topush);
3651 }
3652 gst_object_unref (parse);
3653 }
3654 }
3655
3656 static gboolean
gst_base_parse_sink_activate(GstPad * sinkpad,GstObject * parent)3657 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
3658 {
3659 GstSchedulingFlags sched_flags;
3660 GstBaseParse *parse;
3661 GstQuery *query;
3662 gboolean pull_mode;
3663
3664 parse = GST_BASE_PARSE (parent);
3665
3666 GST_DEBUG_OBJECT (parse, "sink activate");
3667
3668 query = gst_query_new_scheduling ();
3669 if (!gst_pad_peer_query (sinkpad, query)) {
3670 gst_query_unref (query);
3671 goto baseparse_push;
3672 }
3673
3674 gst_query_parse_scheduling (query, &sched_flags, NULL, NULL, NULL);
3675
3676 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL)
3677 && ((sched_flags & GST_SCHEDULING_FLAG_SEEKABLE) != 0);
3678
3679 gst_query_unref (query);
3680
3681 if (!pull_mode)
3682 goto baseparse_push;
3683
3684 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
3685 if (!gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE))
3686 goto baseparse_push;
3687
3688 parse->priv->push_stream_start = TRUE;
3689 /* In pull mode, upstream is BYTES */
3690 parse->priv->upstream_format = GST_FORMAT_BYTES;
3691
3692 return gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop,
3693 sinkpad, NULL);
3694 /* fallback */
3695 baseparse_push:
3696 {
3697 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
3698 return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
3699 }
3700 }
3701
3702 static gboolean
gst_base_parse_activate(GstBaseParse * parse,gboolean active)3703 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
3704 {
3705 GstBaseParseClass *klass;
3706 gboolean result = TRUE;
3707
3708 GST_DEBUG_OBJECT (parse, "activate %d", active);
3709
3710 klass = GST_BASE_PARSE_GET_CLASS (parse);
3711
3712 if (active) {
3713 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
3714 result = klass->start (parse);
3715
3716 /* If the subclass implements ::detect we want to
3717 * call it for the first buffers now */
3718 parse->priv->detecting = (klass->detect != NULL);
3719 } else {
3720 /* We must make sure streaming has finished before resetting things
3721 * and calling the ::stop vfunc */
3722 GST_PAD_STREAM_LOCK (parse->sinkpad);
3723 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3724
3725 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
3726 result = klass->stop (parse);
3727
3728 parse->priv->pad_mode = GST_PAD_MODE_NONE;
3729 parse->priv->upstream_format = GST_FORMAT_UNDEFINED;
3730 }
3731 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
3732 return result;
3733 }
3734
3735 static gboolean
gst_base_parse_sink_activate_mode(GstPad * pad,GstObject * parent,GstPadMode mode,gboolean active)3736 gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
3737 GstPadMode mode, gboolean active)
3738 {
3739 gboolean result;
3740 GstBaseParse *parse;
3741
3742 parse = GST_BASE_PARSE (parent);
3743
3744 GST_DEBUG_OBJECT (parse, "sink %sactivate in %s mode",
3745 (active) ? "" : "de", gst_pad_mode_get_name (mode));
3746
3747 if (!gst_base_parse_activate (parse, active))
3748 goto activate_failed;
3749
3750 switch (mode) {
3751 case GST_PAD_MODE_PULL:
3752 if (active) {
3753 GstEvent *ev = gst_event_new_segment (&parse->segment);
3754 parse->priv->segment_seqnum = gst_event_get_seqnum (ev);
3755 parse->priv->pending_events =
3756 g_list_prepend (parse->priv->pending_events, ev);
3757 result = TRUE;
3758 } else {
3759 result = gst_pad_stop_task (pad);
3760 }
3761 break;
3762 default:
3763 result = TRUE;
3764 break;
3765 }
3766 if (result)
3767 parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
3768
3769 GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
3770
3771 return result;
3772
3773 /* ERRORS */
3774 activate_failed:
3775 {
3776 GST_DEBUG_OBJECT (parse, "activate failed");
3777 return FALSE;
3778 }
3779 }
3780
3781 /**
3782 * gst_base_parse_set_duration:
3783 * @parse: #GstBaseParse.
3784 * @fmt: #GstFormat.
3785 * @duration: duration value.
3786 * @interval: how often to update the duration estimate based on bitrate, or 0.
3787 *
3788 * Sets the duration of the currently playing media. Subclass can use this
3789 * when it is able to determine duration and/or notices a change in the media
3790 * duration. Alternatively, if @interval is non-zero (default), then stream
3791 * duration is determined based on estimated bitrate, and updated every @interval
3792 * frames.
3793 */
3794 void
gst_base_parse_set_duration(GstBaseParse * parse,GstFormat fmt,gint64 duration,gint interval)3795 gst_base_parse_set_duration (GstBaseParse * parse,
3796 GstFormat fmt, gint64 duration, gint interval)
3797 {
3798 g_return_if_fail (parse != NULL);
3799
3800 if (parse->priv->upstream_has_duration) {
3801 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3802 goto exit;
3803 }
3804
3805 if (duration != parse->priv->duration) {
3806 GstMessage *m;
3807
3808 m = gst_message_new_duration_changed (GST_OBJECT (parse));
3809 gst_element_post_message (GST_ELEMENT (parse), m);
3810
3811 /* TODO: what about duration tag? */
3812 }
3813 parse->priv->duration = duration;
3814 parse->priv->duration_fmt = fmt;
3815 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3816 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3817 if (interval != 0) {
3818 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3819 interval = 0;
3820 }
3821 }
3822 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3823 parse->priv->update_interval = interval;
3824 exit:
3825 return;
3826 }
3827
3828 /**
3829 * gst_base_parse_set_average_bitrate:
3830 * @parse: #GstBaseParse.
3831 * @bitrate: average bitrate in bits/second
3832 *
3833 * Optionally sets the average bitrate detected in media (if non-zero),
3834 * e.g. based on metadata, as it will be posted to the application.
3835 *
3836 * By default, announced average bitrate is estimated. The average bitrate
3837 * is used to estimate the total duration of the stream and to estimate
3838 * a seek position, if there's no index and the format is syncable
3839 * (see gst_base_parse_set_syncable()).
3840 */
3841 void
gst_base_parse_set_average_bitrate(GstBaseParse * parse,guint bitrate)3842 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3843 {
3844 parse->priv->bitrate = bitrate;
3845 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3846 }
3847
3848 /**
3849 * gst_base_parse_set_min_frame_size:
3850 * @parse: #GstBaseParse.
3851 * @min_size: Minimum size in bytes of the data that this base class should
3852 * give to subclass.
3853 *
3854 * Subclass can use this function to tell the base class that it needs to
3855 * be given buffers of at least @min_size bytes.
3856 */
3857 void
gst_base_parse_set_min_frame_size(GstBaseParse * parse,guint min_size)3858 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3859 {
3860 g_return_if_fail (parse != NULL);
3861
3862 parse->priv->min_frame_size = min_size;
3863 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3864 }
3865
3866 /**
3867 * gst_base_parse_set_frame_rate:
3868 * @parse: the #GstBaseParse to set
3869 * @fps_num: frames per second (numerator).
3870 * @fps_den: frames per second (denominator).
3871 * @lead_in: frames needed before a segment for subsequent decode
3872 * @lead_out: frames needed after a segment
3873 *
3874 * If frames per second is configured, parser can take care of buffer duration
3875 * and timestamping. When performing segment clipping, or seeking to a specific
3876 * location, a corresponding decoder might need an initial @lead_in and a
3877 * following @lead_out number of frames to ensure the desired segment is
3878 * entirely filled upon decoding.
3879 */
3880 void
gst_base_parse_set_frame_rate(GstBaseParse * parse,guint fps_num,guint fps_den,guint lead_in,guint lead_out)3881 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3882 guint fps_den, guint lead_in, guint lead_out)
3883 {
3884 g_return_if_fail (parse != NULL);
3885
3886 parse->priv->fps_num = fps_num;
3887 parse->priv->fps_den = fps_den;
3888 if (!fps_num || !fps_den) {
3889 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3890 fps_num, fps_den);
3891 fps_num = fps_den = 0;
3892 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3893 parse->priv->lead_in = parse->priv->lead_out = 0;
3894 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3895 } else {
3896 parse->priv->frame_duration =
3897 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3898 parse->priv->lead_in = lead_in;
3899 parse->priv->lead_out = lead_out;
3900 parse->priv->lead_in_ts =
3901 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3902 parse->priv->lead_out_ts =
3903 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3904 /* aim for about 1.5s to estimate duration */
3905 if (parse->priv->update_interval < 0) {
3906 guint64 interval = gst_util_uint64_scale (fps_num, 3,
3907 G_GUINT64_CONSTANT (2) * fps_den);
3908
3909 parse->priv->update_interval = MIN (interval, G_MAXINT);
3910
3911 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3912 parse->priv->update_interval);
3913 }
3914 }
3915 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3916 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3917 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3918 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3919 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3920 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3921 }
3922
3923 /**
3924 * gst_base_parse_set_has_timing_info:
3925 * @parse: a #GstBaseParse
3926 * @has_timing: whether frames carry timing information
3927 *
3928 * Set if frames carry timing information which the subclass can (generally)
3929 * parse and provide. In particular, intrinsic (rather than estimated) time
3930 * can be obtained following a seek.
3931 */
3932 void
gst_base_parse_set_has_timing_info(GstBaseParse * parse,gboolean has_timing)3933 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3934 {
3935 parse->priv->has_timing_info = has_timing;
3936 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3937 }
3938
3939 /**
3940 * gst_base_parse_set_syncable:
3941 * @parse: a #GstBaseParse
3942 * @syncable: set if frame starts can be identified
3943 *
3944 * Set if frame starts can be identified. This is set by default and
3945 * determines whether seeking based on bitrate averages
3946 * is possible for a format/stream.
3947 */
3948 void
gst_base_parse_set_syncable(GstBaseParse * parse,gboolean syncable)3949 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3950 {
3951 parse->priv->syncable = syncable;
3952 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3953 }
3954
3955 /**
3956 * gst_base_parse_set_passthrough:
3957 * @parse: a #GstBaseParse
3958 * @passthrough: %TRUE if parser should run in passthrough mode
3959 *
3960 * Set if the nature of the format or configuration does not allow (much)
3961 * parsing, and the parser should operate in passthrough mode (which only
3962 * applies when operating in push mode). That is, incoming buffers are
3963 * pushed through unmodified, i.e. no #GstBaseParseClass.handle_frame()
3964 * will be invoked, but #GstBaseParseClass.pre_push_frame() will still be
3965 * invoked, so subclass can perform as much or as little is appropriate for
3966 * passthrough semantics in #GstBaseParseClass.pre_push_frame().
3967 */
3968 void
gst_base_parse_set_passthrough(GstBaseParse * parse,gboolean passthrough)3969 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3970 {
3971 parse->priv->passthrough = passthrough;
3972 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3973 }
3974
3975 /**
3976 * gst_base_parse_set_pts_interpolation:
3977 * @parse: a #GstBaseParse
3978 * @pts_interpolate: %TRUE if parser should interpolate PTS timestamps
3979 *
3980 * By default, the base class will guess PTS timestamps using a simple
3981 * interpolation (previous timestamp + duration), which is incorrect for
3982 * data streams with reordering, where PTS can go backward. Sub-classes
3983 * implementing such formats should disable PTS interpolation.
3984 */
3985 void
gst_base_parse_set_pts_interpolation(GstBaseParse * parse,gboolean pts_interpolate)3986 gst_base_parse_set_pts_interpolation (GstBaseParse * parse,
3987 gboolean pts_interpolate)
3988 {
3989 parse->priv->pts_interpolate = pts_interpolate;
3990 GST_INFO_OBJECT (parse, "PTS interpolation: %s",
3991 (pts_interpolate) ? "yes" : "no");
3992 }
3993
3994 /**
3995 * gst_base_parse_set_infer_ts:
3996 * @parse: a #GstBaseParse
3997 * @infer_ts: %TRUE if parser should infer DTS/PTS from each other
3998 *
3999 * By default, the base class might try to infer PTS from DTS and vice
4000 * versa. While this is generally correct for audio data, it may not
4001 * be otherwise. Sub-classes implementing such formats should disable
4002 * timestamp inferring.
4003 */
4004 void
gst_base_parse_set_infer_ts(GstBaseParse * parse,gboolean infer_ts)4005 gst_base_parse_set_infer_ts (GstBaseParse * parse, gboolean infer_ts)
4006 {
4007 parse->priv->infer_ts = infer_ts;
4008 GST_INFO_OBJECT (parse, "TS inferring: %s", (infer_ts) ? "yes" : "no");
4009 }
4010
4011 /**
4012 * gst_base_parse_set_latency:
4013 * @parse: a #GstBaseParse
4014 * @min_latency: minimum parse latency
4015 * @max_latency: maximum parse latency
4016 *
4017 * Sets the minimum and maximum (which may likely be equal) latency introduced
4018 * by the parsing process. If there is such a latency, which depends on the
4019 * particular parsing of the format, it typically corresponds to 1 frame duration.
4020 */
4021 void
gst_base_parse_set_latency(GstBaseParse * parse,GstClockTime min_latency,GstClockTime max_latency)4022 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
4023 GstClockTime max_latency)
4024 {
4025 g_return_if_fail (min_latency != GST_CLOCK_TIME_NONE);
4026 g_return_if_fail (min_latency <= max_latency);
4027
4028 GST_OBJECT_LOCK (parse);
4029 parse->priv->min_latency = min_latency;
4030 parse->priv->max_latency = max_latency;
4031 GST_OBJECT_UNLOCK (parse);
4032 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
4033 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
4034 GST_TIME_ARGS (max_latency));
4035 }
4036
4037 static gboolean
gst_base_parse_get_duration(GstBaseParse * parse,GstFormat format,GstClockTime * duration)4038 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
4039 GstClockTime * duration)
4040 {
4041 gboolean res = FALSE;
4042
4043 g_return_val_if_fail (duration != NULL, FALSE);
4044
4045 *duration = GST_CLOCK_TIME_NONE;
4046 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
4047 GST_LOG_OBJECT (parse, "using provided duration");
4048 *duration = parse->priv->duration;
4049 res = TRUE;
4050 } else if (parse->priv->duration != -1) {
4051 GST_LOG_OBJECT (parse, "converting provided duration");
4052 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
4053 parse->priv->duration, format, (gint64 *) duration);
4054 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
4055 GST_LOG_OBJECT (parse, "using estimated duration");
4056 *duration = parse->priv->estimated_duration;
4057 res = TRUE;
4058 } else {
4059 GST_LOG_OBJECT (parse, "cannot estimate duration");
4060 }
4061
4062 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
4063 GST_TIME_ARGS (*duration));
4064 return res;
4065 }
4066
4067 static gboolean
gst_base_parse_src_query_default(GstBaseParse * parse,GstQuery * query)4068 gst_base_parse_src_query_default (GstBaseParse * parse, GstQuery * query)
4069 {
4070 gboolean res = FALSE;
4071 GstPad *pad;
4072
4073 pad = GST_BASE_PARSE_SRC_PAD (parse);
4074
4075 switch (GST_QUERY_TYPE (query)) {
4076 case GST_QUERY_POSITION:
4077 {
4078 gint64 dest_value;
4079 GstFormat format;
4080
4081 GST_DEBUG_OBJECT (parse, "position query");
4082 gst_query_parse_position (query, &format, NULL);
4083
4084 /* try upstream first */
4085 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
4086 if (!res) {
4087 /* Fall back on interpreting segment */
4088 GST_OBJECT_LOCK (parse);
4089 /* Only reply BYTES if upstream is in BYTES already, otherwise
4090 * we're not in charge */
4091 if (format == GST_FORMAT_BYTES
4092 && parse->priv->upstream_format == GST_FORMAT_BYTES) {
4093 dest_value = parse->priv->offset;
4094 res = TRUE;
4095 } else if (format == parse->segment.format &&
4096 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
4097 dest_value = gst_segment_to_stream_time (&parse->segment,
4098 parse->segment.format, parse->segment.position);
4099 res = TRUE;
4100 }
4101 GST_OBJECT_UNLOCK (parse);
4102 if (!res && parse->priv->upstream_format == GST_FORMAT_BYTES) {
4103 /* no precise result, upstream no idea either, then best estimate */
4104 /* priv->offset is updated in both PUSH/PULL modes, *iff* we're
4105 * in charge of things */
4106 res = gst_base_parse_convert (parse,
4107 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
4108 }
4109 if (res)
4110 gst_query_set_position (query, format, dest_value);
4111 }
4112 break;
4113 }
4114 case GST_QUERY_DURATION:
4115 {
4116 GstFormat format;
4117 GstClockTime duration;
4118
4119 GST_DEBUG_OBJECT (parse, "duration query");
4120 gst_query_parse_duration (query, &format, NULL);
4121
4122 /* consult upstream */
4123 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
4124
4125 /* otherwise best estimate from us */
4126 if (!res) {
4127 res = gst_base_parse_get_duration (parse, format, &duration);
4128 if (res)
4129 gst_query_set_duration (query, format, duration);
4130 }
4131 break;
4132 }
4133 case GST_QUERY_SEEKING:
4134 {
4135 GstFormat fmt;
4136 GstClockTime duration = GST_CLOCK_TIME_NONE;
4137 gboolean seekable = FALSE;
4138
4139 GST_DEBUG_OBJECT (parse, "seeking query");
4140 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
4141
4142 /* consult upstream */
4143 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
4144
4145 /* we may be able to help if in TIME */
4146 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
4147 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
4148 /* already OK if upstream takes care */
4149 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
4150 res, seekable);
4151 if (!(res && seekable)) {
4152 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
4153 || duration == -1) {
4154 /* seekable if we still have a chance to get duration later on */
4155 seekable = parse->priv->upstream_seekable &&
4156 (parse->priv->update_interval > 0);
4157 } else {
4158 seekable = parse->priv->upstream_seekable;
4159 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
4160 seekable);
4161 }
4162 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
4163 res = TRUE;
4164 }
4165 }
4166 break;
4167 }
4168 case GST_QUERY_FORMATS:
4169 gst_query_set_formatsv (query, 3, fmtlist);
4170 res = TRUE;
4171 break;
4172 case GST_QUERY_CONVERT:
4173 {
4174 GstFormat src_format, dest_format;
4175 gint64 src_value, dest_value;
4176
4177 gst_query_parse_convert (query, &src_format, &src_value,
4178 &dest_format, &dest_value);
4179
4180 res = gst_base_parse_convert (parse, src_format, src_value,
4181 dest_format, &dest_value);
4182 if (res) {
4183 gst_query_set_convert (query, src_format, src_value,
4184 dest_format, dest_value);
4185 }
4186 break;
4187 }
4188 case GST_QUERY_LATENCY:
4189 {
4190 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
4191 gboolean live;
4192 GstClockTime min_latency, max_latency;
4193
4194 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
4195 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
4196 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
4197 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
4198
4199 GST_OBJECT_LOCK (parse);
4200 /* add our latency */
4201 min_latency += parse->priv->min_latency;
4202 if (max_latency == -1 || parse->priv->max_latency == -1)
4203 max_latency = -1;
4204 else
4205 max_latency += parse->priv->max_latency;
4206 GST_OBJECT_UNLOCK (parse);
4207
4208 gst_query_set_latency (query, live, min_latency, max_latency);
4209 }
4210 break;
4211 }
4212 case GST_QUERY_SEGMENT:
4213 {
4214 GstFormat format;
4215 gint64 start, stop;
4216
4217 format = parse->segment.format;
4218
4219 start =
4220 gst_segment_to_stream_time (&parse->segment, format,
4221 parse->segment.start);
4222 if ((stop = parse->segment.stop) == -1)
4223 stop = parse->segment.duration;
4224 else
4225 stop = gst_segment_to_stream_time (&parse->segment, format, stop);
4226
4227 gst_query_set_segment (query, parse->segment.rate, format, start, stop);
4228 res = TRUE;
4229 break;
4230 }
4231 default:
4232 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
4233 break;
4234 }
4235 return res;
4236 }
4237
4238 /* scans for a cluster start from @pos,
4239 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
4240 static GstFlowReturn
gst_base_parse_find_frame(GstBaseParse * parse,gint64 * pos,GstClockTime * time,GstClockTime * duration)4241 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
4242 GstClockTime * time, GstClockTime * duration)
4243 {
4244 GstBaseParseClass *klass;
4245 gint64 orig_offset;
4246 gboolean orig_drain, orig_discont;
4247 GstFlowReturn ret = GST_FLOW_OK;
4248 GstBuffer *buf = NULL;
4249 GstBaseParseFrame *sframe = NULL;
4250
4251 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
4252 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
4253 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
4254
4255 klass = GST_BASE_PARSE_GET_CLASS (parse);
4256
4257 *time = GST_CLOCK_TIME_NONE;
4258 *duration = GST_CLOCK_TIME_NONE;
4259
4260 /* save state */
4261 orig_offset = parse->priv->offset;
4262 orig_discont = parse->priv->discont;
4263 orig_drain = parse->priv->drain;
4264
4265 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
4266 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
4267
4268 /* jump elsewhere and locate next frame */
4269 parse->priv->offset = *pos;
4270 /* mark as scanning so frames don't get processed all the way */
4271 parse->priv->scanning = TRUE;
4272 ret = gst_base_parse_scan_frame (parse, klass);
4273 parse->priv->scanning = FALSE;
4274 /* retrieve frame found during scan */
4275 sframe = parse->priv->scanned_frame;
4276 parse->priv->scanned_frame = NULL;
4277
4278 if (ret != GST_FLOW_OK || !sframe)
4279 goto done;
4280
4281 /* get offset first, subclass parsing might dump other stuff in there */
4282 *pos = sframe->offset;
4283 buf = sframe->buffer;
4284 g_assert (buf);
4285
4286 /* but it should provide proper time */
4287 *time = GST_BUFFER_TIMESTAMP (buf);
4288 *duration = GST_BUFFER_DURATION (buf);
4289
4290 GST_LOG_OBJECT (parse,
4291 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
4292 GST_TIME_ARGS (*time), *pos);
4293
4294 done:
4295 if (sframe)
4296 gst_base_parse_frame_free (sframe);
4297
4298 /* restore state */
4299 parse->priv->offset = orig_offset;
4300 parse->priv->discont = orig_discont;
4301 parse->priv->drain = orig_drain;
4302
4303 return ret;
4304 }
4305
4306 /* bisect and scan through file for frame starting before @time,
4307 * returns OK and @time/@offset if found, NONE and/or error otherwise
4308 * If @time == G_MAXINT64, scan for duration ( == last frame) */
4309 static GstFlowReturn
gst_base_parse_locate_time(GstBaseParse * parse,GstClockTime * _time,gint64 * _offset)4310 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
4311 gint64 * _offset)
4312 {
4313 GstFlowReturn ret = GST_FLOW_OK;
4314 gint64 lpos, hpos, newpos;
4315 GstClockTime time, ltime, htime, newtime, dur;
4316 gboolean cont = TRUE;
4317 const GstClockTime tolerance = TARGET_DIFFERENCE;
4318 const guint chunk = 4 * 1024;
4319
4320 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
4321 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
4322
4323 GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
4324 GST_TIME_ARGS (*_time));
4325
4326 /* TODO also make keyframe aware if useful some day */
4327
4328 time = *_time;
4329
4330 /* basic cases */
4331 if (time == 0) {
4332 *_offset = 0;
4333 return GST_FLOW_OK;
4334 }
4335
4336 if (time == -1) {
4337 *_offset = -1;
4338 return GST_FLOW_OK;
4339 }
4340
4341 /* do not know at first */
4342 *_offset = -1;
4343 *_time = GST_CLOCK_TIME_NONE;
4344
4345 /* need initial positions; start and end */
4346 lpos = parse->priv->first_frame_offset;
4347 ltime = parse->priv->first_frame_pts;
4348 /* try other one if no luck */
4349 if (!GST_CLOCK_TIME_IS_VALID (ltime))
4350 ltime = parse->priv->first_frame_dts;
4351 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
4352 GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
4353 return GST_FLOW_ERROR;
4354 }
4355 hpos = parse->priv->upstream_size;
4356
4357 GST_DEBUG_OBJECT (parse,
4358 "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
4359 ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, hpos,
4360 GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
4361
4362 /* check preconditions are satisfied;
4363 * start and end are needed, except for special case where we scan for
4364 * last frame to determine duration */
4365 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
4366 !GST_CLOCK_TIME_IS_VALID (ltime) ||
4367 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
4368 return GST_FLOW_OK;
4369 }
4370
4371 /* shortcut cases */
4372 if (time < ltime) {
4373 goto exit;
4374 } else if (time < ltime + tolerance) {
4375 *_offset = lpos;
4376 *_time = ltime;
4377 goto exit;
4378 } else if (time >= htime) {
4379 *_offset = hpos;
4380 *_time = htime;
4381 goto exit;
4382 }
4383
4384 while (htime > ltime && cont) {
4385 GST_LOG_OBJECT (parse,
4386 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
4387 GST_TIME_ARGS (ltime));
4388 GST_LOG_OBJECT (parse,
4389 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
4390 GST_TIME_ARGS (htime));
4391 if (G_UNLIKELY (time == G_MAXINT64)) {
4392 newpos = hpos;
4393 } else if (G_LIKELY (hpos > lpos)) {
4394 newpos =
4395 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
4396 lpos - chunk;
4397 } else {
4398 /* should mean lpos == hpos, since lpos <= hpos is invariant */
4399 newpos = lpos;
4400 /* we check this case once, but not forever, so break loop */
4401 cont = FALSE;
4402 }
4403
4404 /* ensure */
4405 newpos = CLAMP (newpos, lpos, hpos);
4406 GST_LOG_OBJECT (parse,
4407 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
4408 GST_TIME_ARGS (time), newpos);
4409
4410 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
4411 if (ret == GST_FLOW_EOS) {
4412 /* heuristic HACK */
4413 hpos = MAX (lpos, hpos - chunk);
4414 continue;
4415 } else if (ret != GST_FLOW_OK) {
4416 goto exit;
4417 }
4418
4419 if (newtime == -1 || newpos == -1) {
4420 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
4421 break;
4422 }
4423
4424 if (G_UNLIKELY (time == G_MAXINT64)) {
4425 *_offset = newpos;
4426 *_time = newtime;
4427 if (GST_CLOCK_TIME_IS_VALID (dur))
4428 *_time += dur;
4429 break;
4430 } else if (newtime > time) {
4431 /* overshoot */
4432 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
4433 htime = newtime;
4434 } else if (newtime + tolerance > time) {
4435 /* close enough undershoot */
4436 *_offset = newpos;
4437 *_time = newtime;
4438 break;
4439 } else if (newtime < ltime) {
4440 /* so a position beyond lpos resulted in earlier time than ltime ... */
4441 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
4442 break;
4443 } else {
4444 /* undershoot too far */
4445 newpos += newpos == lpos ? chunk : 0;
4446 lpos = CLAMP (newpos, lpos, hpos);
4447 ltime = newtime;
4448 }
4449 }
4450
4451 exit:
4452 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
4453 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
4454 return ret;
4455 }
4456
4457 static gint64
gst_base_parse_find_offset(GstBaseParse * parse,GstClockTime time,gboolean before,GstClockTime * _ts)4458 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
4459 gboolean before, GstClockTime * _ts)
4460 {
4461 gint64 bytes = 0, ts = 0;
4462 GstIndexEntry *entry = NULL;
4463
4464 if (time == GST_CLOCK_TIME_NONE) {
4465 ts = time;
4466 bytes = -1;
4467 goto exit;
4468 }
4469
4470 GST_BASE_PARSE_INDEX_LOCK (parse);
4471 if (parse->priv->index) {
4472 /* Let's check if we have an index entry for that time */
4473 entry = gst_index_get_assoc_entry (parse->priv->index,
4474 parse->priv->index_id,
4475 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
4476 GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
4477 }
4478
4479 if (entry) {
4480 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
4481 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
4482
4483 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
4484 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
4485 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
4486 } else {
4487 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
4488 GST_TIME_ARGS (time));
4489 if (!before) {
4490 bytes = -1;
4491 ts = GST_CLOCK_TIME_NONE;
4492 }
4493 }
4494 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4495
4496 exit:
4497 if (_ts)
4498 *_ts = ts;
4499
4500 return bytes;
4501 }
4502
4503 /* returns TRUE if seek succeeded */
4504 static gboolean
gst_base_parse_handle_seek(GstBaseParse * parse,GstEvent * event)4505 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
4506 {
4507 gdouble rate;
4508 GstFormat format;
4509 GstSeekFlags flags;
4510 GstSeekType start_type = GST_SEEK_TYPE_NONE, stop_type;
4511 gboolean flush, update, res = TRUE, accurate;
4512 gint64 start, stop, seekpos, seekstop;
4513 GstSegment seeksegment = { 0, };
4514 GstClockTime start_ts;
4515 guint32 seqnum;
4516 GstEvent *segment_event;
4517
4518 /* try upstream first, unless we're driving the streaming thread ourselves */
4519 if (parse->priv->pad_mode != GST_PAD_MODE_PULL) {
4520 res = gst_pad_push_event (parse->sinkpad, gst_event_ref (event));
4521 if (res)
4522 goto done;
4523 }
4524
4525 gst_event_parse_seek (event, &rate, &format, &flags,
4526 &start_type, &start, &stop_type, &stop);
4527 seqnum = gst_event_get_seqnum (event);
4528
4529 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
4530 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
4531 GST_TIME_FORMAT, gst_format_get_name (format), rate,
4532 start_type, GST_TIME_ARGS (start), stop_type, GST_TIME_ARGS (stop));
4533
4534 /* we can only handle TIME, so check if subclass can convert
4535 * to TIME format if it's some other format (such as DEFAULT) */
4536 if (format != GST_FORMAT_TIME) {
4537 if (!gst_base_parse_convert (parse, format, start, GST_FORMAT_TIME, &start)
4538 || !gst_base_parse_convert (parse, format, stop, GST_FORMAT_TIME,
4539 &stop))
4540 goto no_convert_to_time;
4541
4542 GST_INFO_OBJECT (parse, "converted %s format to start time "
4543 "%" GST_TIME_FORMAT " and stop time %" GST_TIME_FORMAT,
4544 gst_format_get_name (format), GST_TIME_ARGS (start),
4545 GST_TIME_ARGS (stop));
4546
4547 format = GST_FORMAT_TIME;
4548 }
4549
4550 /* no negative rates in push mode (unless upstream takes care of that, but
4551 * we've already tried upstream and it didn't handle the seek request) */
4552 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
4553 goto negative_rate;
4554
4555 if (start_type != GST_SEEK_TYPE_SET ||
4556 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
4557 goto wrong_type;
4558
4559 /* get flush flag */
4560 flush = flags & GST_SEEK_FLAG_FLUSH;
4561
4562 /* copy segment, we need this because we still need the old
4563 * segment when we close the current segment. */
4564 gst_segment_copy_into (&parse->segment, &seeksegment);
4565
4566 GST_DEBUG_OBJECT (parse, "configuring seek");
4567 gst_segment_do_seek (&seeksegment, rate, format, flags,
4568 start_type, start, stop_type, stop, &update);
4569
4570 /* accurate seeking implies seek tables are used to obtain position,
4571 * and the requested segment is maintained exactly, not adjusted any way */
4572 accurate = flags & GST_SEEK_FLAG_ACCURATE;
4573
4574 /* maybe we can be accurate for (almost) free */
4575 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
4576 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
4577 GST_DEBUG_OBJECT (parse, "accurate seek possible");
4578 accurate = TRUE;
4579 }
4580
4581 if (accurate) {
4582 GstClockTime startpos;
4583 if (rate >= 0)
4584 startpos = seeksegment.position;
4585 else
4586 startpos = start;
4587
4588 /* accurate requested, so ... seek a bit before target */
4589 if (startpos < parse->priv->lead_in_ts)
4590 startpos = 0;
4591 else
4592 startpos -= parse->priv->lead_in_ts;
4593
4594 if (seeksegment.stop == -1 && seeksegment.duration != -1)
4595 seeksegment.stop = seeksegment.start + seeksegment.duration;
4596
4597 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
4598 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
4599 NULL);
4600 } else {
4601 if (rate >= 0)
4602 start_ts = seeksegment.position;
4603 else
4604 start_ts = start;
4605
4606 if (seeksegment.stop == -1 && seeksegment.duration != -1)
4607 seeksegment.stop = seeksegment.start + seeksegment.duration;
4608
4609 if (!gst_base_parse_convert (parse, format, start_ts,
4610 GST_FORMAT_BYTES, &seekpos))
4611 goto convert_failed;
4612 if (!gst_base_parse_convert (parse, format, seeksegment.stop,
4613 GST_FORMAT_BYTES, &seekstop))
4614 goto convert_failed;
4615 }
4616
4617 GST_DEBUG_OBJECT (parse,
4618 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
4619 start_ts, seekpos);
4620 GST_DEBUG_OBJECT (parse,
4621 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
4622 seeksegment.stop, seekstop);
4623
4624 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
4625 gint64 last_stop;
4626
4627 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
4628
4629 if (flush) {
4630 if (parse->srcpad) {
4631 GstEvent *fevent = gst_event_new_flush_start ();
4632 GST_DEBUG_OBJECT (parse, "sending flush start");
4633
4634 gst_event_set_seqnum (fevent, seqnum);
4635
4636 gst_pad_push_event (parse->srcpad, gst_event_ref (fevent));
4637 /* unlock upstream pull_range */
4638 gst_pad_push_event (parse->sinkpad, fevent);
4639 }
4640 } else {
4641 gst_pad_pause_task (parse->sinkpad);
4642 }
4643
4644 /* we should now be able to grab the streaming thread because we stopped it
4645 * with the above flush/pause code */
4646 GST_PAD_STREAM_LOCK (parse->sinkpad);
4647
4648 /* save current position */
4649 last_stop = parse->segment.position;
4650 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
4651 last_stop);
4652
4653 /* now commit to new position */
4654
4655 /* prepare for streaming again */
4656 if (flush) {
4657 GstEvent *fevent = gst_event_new_flush_stop (TRUE);
4658 GST_DEBUG_OBJECT (parse, "sending flush stop");
4659 gst_event_set_seqnum (fevent, seqnum);
4660 gst_pad_push_event (parse->srcpad, gst_event_ref (fevent));
4661 gst_pad_push_event (parse->sinkpad, fevent);
4662 gst_base_parse_clear_queues (parse);
4663 }
4664
4665 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
4666
4667 /* store the newsegment event so it can be sent from the streaming thread. */
4668 /* This will be sent later in _loop() */
4669 segment_event = gst_event_new_segment (&parse->segment);
4670 gst_event_set_seqnum (segment_event, seqnum);
4671 parse->priv->pending_events =
4672 g_list_prepend (parse->priv->pending_events, segment_event);
4673
4674 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
4675 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
4676 ", time = %" GST_TIME_FORMAT, format,
4677 GST_TIME_ARGS (parse->segment.start),
4678 GST_TIME_ARGS (parse->segment.stop),
4679 GST_TIME_ARGS (parse->segment.time));
4680
4681 /* one last chance in pull mode to stay accurate;
4682 * maybe scan and subclass can find where to go */
4683 if (!accurate) {
4684 gint64 scanpos;
4685 GstClockTime ts = seeksegment.position;
4686
4687 gst_base_parse_locate_time (parse, &ts, &scanpos);
4688 if (scanpos >= 0) {
4689 accurate = TRUE;
4690 seekpos = scanpos;
4691 /* running collected index now consists of several intervals,
4692 * so optimized check no longer possible */
4693 parse->priv->index_last_valid = FALSE;
4694 parse->priv->index_last_offset = 0;
4695 parse->priv->index_last_ts = 0;
4696 }
4697 }
4698
4699 /* mark discont if we are going to stream from another position. */
4700 if (seekpos != parse->priv->offset) {
4701 GST_DEBUG_OBJECT (parse,
4702 "mark DISCONT, we did a seek to another position");
4703 parse->priv->offset = seekpos;
4704 parse->priv->last_offset = seekpos;
4705 parse->priv->seen_keyframe = FALSE;
4706 parse->priv->discont = TRUE;
4707 parse->priv->next_dts = start_ts;
4708 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
4709 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
4710 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
4711 parse->priv->sync_offset = seekpos;
4712 parse->priv->exact_position = accurate;
4713 }
4714
4715 /* Start streaming thread if paused */
4716 gst_pad_start_task (parse->sinkpad,
4717 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad, NULL);
4718
4719 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
4720
4721 /* handled seek */
4722 res = TRUE;
4723 } else {
4724 GstEvent *new_event;
4725 GstBaseParseSeek *seek;
4726 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
4727
4728 /* The only thing we need to do in PUSH-mode is to send the
4729 seek event (in bytes) to upstream. Segment / flush handling happens
4730 in corresponding src event handlers */
4731 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
4732 if (seekstop >= 0 && seekstop <= seekpos)
4733 seekstop = seekpos;
4734 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
4735 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
4736 gst_event_set_seqnum (new_event, seqnum);
4737
4738 /* store segment info so its precise details can be reconstructed when
4739 * receiving newsegment;
4740 * this matters for all details when accurate seeking,
4741 * is most useful to preserve NONE stop time otherwise */
4742 seek = g_new0 (GstBaseParseSeek, 1);
4743 seek->segment = seeksegment;
4744 seek->accurate = accurate;
4745 seek->offset = seekpos;
4746 seek->start_ts = start_ts;
4747 GST_OBJECT_LOCK (parse);
4748 /* less optimal, but preserves order */
4749 parse->priv->pending_seeks =
4750 g_slist_append (parse->priv->pending_seeks, seek);
4751 GST_OBJECT_UNLOCK (parse);
4752
4753 res = gst_pad_push_event (parse->sinkpad, new_event);
4754
4755 if (!res) {
4756 GST_OBJECT_LOCK (parse);
4757 parse->priv->pending_seeks =
4758 g_slist_remove (parse->priv->pending_seeks, seek);
4759 GST_OBJECT_UNLOCK (parse);
4760 g_free (seek);
4761 }
4762 }
4763
4764 done:
4765 gst_event_unref (event);
4766 return res;
4767
4768 /* ERRORS */
4769 negative_rate:
4770 {
4771 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
4772 res = FALSE;
4773 goto done;
4774 }
4775 wrong_type:
4776 {
4777 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
4778 res = FALSE;
4779 goto done;
4780 }
4781 no_convert_to_time:
4782 {
4783 GST_DEBUG_OBJECT (parse, "seek in %s format was requested, but subclass "
4784 "couldn't convert that into TIME format", gst_format_get_name (format));
4785 res = FALSE;
4786 goto done;
4787 }
4788 convert_failed:
4789 {
4790 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
4791 res = FALSE;
4792 goto done;
4793 }
4794 }
4795
4796 static void
gst_base_parse_set_upstream_tags(GstBaseParse * parse,GstTagList * taglist)4797 gst_base_parse_set_upstream_tags (GstBaseParse * parse, GstTagList * taglist)
4798 {
4799 if (taglist == parse->priv->upstream_tags)
4800 return;
4801
4802 if (parse->priv->upstream_tags) {
4803 gst_tag_list_unref (parse->priv->upstream_tags);
4804 parse->priv->upstream_tags = NULL;
4805 }
4806
4807 GST_INFO_OBJECT (parse, "upstream tags: %" GST_PTR_FORMAT, taglist);
4808
4809 if (taglist != NULL)
4810 parse->priv->upstream_tags = gst_tag_list_ref (taglist);
4811
4812 gst_base_parse_check_bitrate_tags (parse);
4813 }
4814
4815 #if 0
4816 static void
4817 gst_base_parse_set_index (GstElement * element, GstIndex * index)
4818 {
4819 GstBaseParse *parse = GST_BASE_PARSE (element);
4820
4821 GST_BASE_PARSE_INDEX_LOCK (parse);
4822 if (parse->priv->index)
4823 gst_object_unref (parse->priv->index);
4824 if (index) {
4825 parse->priv->index = gst_object_ref (index);
4826 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4827 &parse->priv->index_id);
4828 parse->priv->own_index = FALSE;
4829 } else {
4830 parse->priv->index = NULL;
4831 }
4832 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4833 }
4834
4835 static GstIndex *
4836 gst_base_parse_get_index (GstElement * element)
4837 {
4838 GstBaseParse *parse = GST_BASE_PARSE (element);
4839 GstIndex *result = NULL;
4840
4841 GST_BASE_PARSE_INDEX_LOCK (parse);
4842 if (parse->priv->index)
4843 result = gst_object_ref (parse->priv->index);
4844 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4845
4846 return result;
4847 }
4848 #endif
4849
4850 static GstStateChangeReturn
gst_base_parse_change_state(GstElement * element,GstStateChange transition)4851 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4852 {
4853 GstBaseParse *parse;
4854 GstStateChangeReturn result;
4855
4856 parse = GST_BASE_PARSE (element);
4857
4858 switch (transition) {
4859 case GST_STATE_CHANGE_READY_TO_PAUSED:
4860 /* If this is our own index destroy it as the
4861 * old entries might be wrong for the new stream */
4862 GST_BASE_PARSE_INDEX_LOCK (parse);
4863 if (parse->priv->own_index) {
4864 gst_object_unref (parse->priv->index);
4865 parse->priv->index = NULL;
4866 parse->priv->own_index = FALSE;
4867 }
4868
4869 /* If no index was created, generate one */
4870 if (G_UNLIKELY (!parse->priv->index)) {
4871 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4872
4873 parse->priv->index = g_object_new (gst_mem_index_get_type (), NULL);
4874 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4875 &parse->priv->index_id);
4876 parse->priv->own_index = TRUE;
4877 }
4878 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4879 break;
4880 default:
4881 break;
4882 }
4883
4884 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4885
4886 switch (transition) {
4887 case GST_STATE_CHANGE_PAUSED_TO_READY:
4888 gst_base_parse_reset (parse);
4889 break;
4890 default:
4891 break;
4892 }
4893
4894 return result;
4895 }
4896
4897 /**
4898 * gst_base_parse_set_ts_at_offset:
4899 * @parse: a #GstBaseParse
4900 * @offset: offset into current buffer
4901 *
4902 * This function should only be called from a @handle_frame implementation.
4903 *
4904 * #GstBaseParse creates initial timestamps for frames by using the last
4905 * timestamp seen in the stream before the frame starts. In certain
4906 * cases, the correct timestamps will occur in the stream after the
4907 * start of the frame, but before the start of the actual picture data.
4908 * This function can be used to set the timestamps based on the offset
4909 * into the frame data that the picture starts.
4910 *
4911 * Since: 1.2
4912 */
4913 void
gst_base_parse_set_ts_at_offset(GstBaseParse * parse,gsize offset)4914 gst_base_parse_set_ts_at_offset (GstBaseParse * parse, gsize offset)
4915 {
4916 GstClockTime pts, dts;
4917
4918 g_return_if_fail (GST_IS_BASE_PARSE (parse));
4919
4920 pts = gst_adapter_prev_pts_at_offset (parse->priv->adapter, offset, NULL);
4921 dts = gst_adapter_prev_dts_at_offset (parse->priv->adapter, offset, NULL);
4922
4923 if (!GST_CLOCK_TIME_IS_VALID (pts) || !GST_CLOCK_TIME_IS_VALID (dts)) {
4924 GST_DEBUG_OBJECT (parse,
4925 "offset adapter timestamps dts=%" GST_TIME_FORMAT " pts=%"
4926 GST_TIME_FORMAT, GST_TIME_ARGS (dts), GST_TIME_ARGS (pts));
4927 }
4928 if (GST_CLOCK_TIME_IS_VALID (pts) && (parse->priv->prev_pts != pts))
4929 parse->priv->prev_pts = parse->priv->next_pts = pts;
4930
4931 if (GST_CLOCK_TIME_IS_VALID (dts) && (parse->priv->prev_dts != dts)) {
4932 parse->priv->prev_dts = parse->priv->next_dts = dts;
4933 parse->priv->prev_dts_from_pts = FALSE;
4934 }
4935 }
4936
4937 /**
4938 * gst_base_parse_merge_tags:
4939 * @parse: a #GstBaseParse
4940 * @tags: (allow-none): a #GstTagList to merge, or NULL to unset
4941 * previously-set tags
4942 * @mode: the #GstTagMergeMode to use, usually #GST_TAG_MERGE_REPLACE
4943 *
4944 * Sets the parser subclass's tags and how they should be merged with any
4945 * upstream stream tags. This will override any tags previously-set
4946 * with gst_base_parse_merge_tags().
4947 *
4948 * Note that this is provided for convenience, and the subclass is
4949 * not required to use this and can still do tag handling on its own.
4950 *
4951 * Since: 1.6
4952 */
4953 void
gst_base_parse_merge_tags(GstBaseParse * parse,GstTagList * tags,GstTagMergeMode mode)4954 gst_base_parse_merge_tags (GstBaseParse * parse, GstTagList * tags,
4955 GstTagMergeMode mode)
4956 {
4957 g_return_if_fail (GST_IS_BASE_PARSE (parse));
4958 g_return_if_fail (tags == NULL || GST_IS_TAG_LIST (tags));
4959 g_return_if_fail (tags == NULL || mode != GST_TAG_MERGE_UNDEFINED);
4960
4961 GST_OBJECT_LOCK (parse);
4962
4963 if (tags != parse->priv->parser_tags) {
4964 if (parse->priv->parser_tags) {
4965 gst_tag_list_unref (parse->priv->parser_tags);
4966 parse->priv->parser_tags = NULL;
4967 parse->priv->parser_tags_merge_mode = GST_TAG_MERGE_APPEND;
4968 }
4969 if (tags) {
4970 parse->priv->parser_tags = gst_tag_list_ref (tags);
4971 parse->priv->parser_tags_merge_mode = mode;
4972 }
4973
4974 GST_DEBUG_OBJECT (parse, "setting parser tags to %" GST_PTR_FORMAT
4975 " (mode %d)", tags, parse->priv->parser_tags_merge_mode);
4976
4977 gst_base_parse_check_bitrate_tags (parse);
4978 parse->priv->tags_changed = TRUE;
4979 }
4980
4981 GST_OBJECT_UNLOCK (parse);
4982 }
4983