1 /* GStreamer
2 * Copyright (C) <2006> Wim Taymans <wim.taymans@gmail.com>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20 #ifdef HAVE_CONFIG_H
21 # include "config.h"
22 #endif
23
24 #include <stdio.h>
25 #include <string.h>
26
27 #include <gst/base/gstbitreader.h>
28 #include <gst/rtp/gstrtpbuffer.h>
29 #include <gst/pbutils/pbutils.h>
30 #include <gst/video/video.h>
31 #include "gstrtph264depay.h"
32 #include "gstrtputils.h"
33
34 GST_DEBUG_CATEGORY_STATIC (rtph264depay_debug);
35 #define GST_CAT_DEFAULT (rtph264depay_debug)
36
37 /* This is what we'll default to when downstream hasn't
38 * expressed a restriction or preference via caps */
39 #define DEFAULT_BYTE_STREAM TRUE
40 #define DEFAULT_ACCESS_UNIT FALSE
41
42 /* 3 zero bytes syncword */
43 static const guint8 sync_bytes[] = { 0, 0, 0, 1 };
44
45 static GstStaticPadTemplate gst_rtp_h264_depay_src_template =
46 GST_STATIC_PAD_TEMPLATE ("src",
47 GST_PAD_SRC,
48 GST_PAD_ALWAYS,
49 GST_STATIC_CAPS ("video/x-h264, "
50 "stream-format = (string) avc, alignment = (string) au; "
51 "video/x-h264, "
52 "stream-format = (string) byte-stream, alignment = (string) { nal, au }")
53 );
54
55 static GstStaticPadTemplate gst_rtp_h264_depay_sink_template =
56 GST_STATIC_PAD_TEMPLATE ("sink",
57 GST_PAD_SINK,
58 GST_PAD_ALWAYS,
59 GST_STATIC_CAPS ("application/x-rtp, "
60 "media = (string) \"video\", "
61 "clock-rate = (int) 90000, " "encoding-name = (string) \"H264\"")
62 /** optional parameters **/
63 /* "profile-level-id = (string) ANY, " */
64 /* "max-mbps = (string) ANY, " */
65 /* "max-fs = (string) ANY, " */
66 /* "max-cpb = (string) ANY, " */
67 /* "max-dpb = (string) ANY, " */
68 /* "max-br = (string) ANY, " */
69 /* "redundant-pic-cap = (string) { \"0\", \"1\" }, " */
70 /* "sprop-parameter-sets = (string) ANY, " */
71 /* "parameter-add = (string) { \"0\", \"1\" }, " */
72 /* "packetization-mode = (string) { \"0\", \"1\", \"2\" }, " */
73 /* "sprop-interleaving-depth = (string) ANY, " */
74 /* "sprop-deint-buf-req = (string) ANY, " */
75 /* "deint-buf-cap = (string) ANY, " */
76 /* "sprop-init-buf-time = (string) ANY, " */
77 /* "sprop-max-don-diff = (string) ANY, " */
78 /* "max-rcmd-nalu-size = (string) ANY " */
79 );
80
81 #define gst_rtp_h264_depay_parent_class parent_class
82 G_DEFINE_TYPE (GstRtpH264Depay, gst_rtp_h264_depay,
83 GST_TYPE_RTP_BASE_DEPAYLOAD);
84
85 static void gst_rtp_h264_depay_finalize (GObject * object);
86
87 static GstStateChangeReturn gst_rtp_h264_depay_change_state (GstElement *
88 element, GstStateChange transition);
89
90 static GstBuffer *gst_rtp_h264_depay_process (GstRTPBaseDepayload * depayload,
91 GstRTPBuffer * rtp);
92 static gboolean gst_rtp_h264_depay_setcaps (GstRTPBaseDepayload * filter,
93 GstCaps * caps);
94 static gboolean gst_rtp_h264_depay_handle_event (GstRTPBaseDepayload * depay,
95 GstEvent * event);
96 static GstBuffer *gst_rtp_h264_complete_au (GstRtpH264Depay * rtph264depay,
97 GstClockTime * out_timestamp, gboolean * out_keyframe);
98 static void gst_rtp_h264_depay_push (GstRtpH264Depay * rtph264depay,
99 GstBuffer * outbuf, gboolean keyframe, GstClockTime timestamp,
100 gboolean marker);
101
102 static void
gst_rtp_h264_depay_class_init(GstRtpH264DepayClass * klass)103 gst_rtp_h264_depay_class_init (GstRtpH264DepayClass * klass)
104 {
105 GObjectClass *gobject_class;
106 GstElementClass *gstelement_class;
107 GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
108
109 gobject_class = (GObjectClass *) klass;
110 gstelement_class = (GstElementClass *) klass;
111 gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
112
113 gobject_class->finalize = gst_rtp_h264_depay_finalize;
114
115 gst_element_class_add_static_pad_template (gstelement_class,
116 &gst_rtp_h264_depay_src_template);
117 gst_element_class_add_static_pad_template (gstelement_class,
118 &gst_rtp_h264_depay_sink_template);
119
120 gst_element_class_set_static_metadata (gstelement_class,
121 "RTP H264 depayloader", "Codec/Depayloader/Network/RTP",
122 "Extracts H264 video from RTP packets (RFC 3984)",
123 "Wim Taymans <wim.taymans@gmail.com>");
124 gstelement_class->change_state = gst_rtp_h264_depay_change_state;
125
126 gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_h264_depay_process;
127 gstrtpbasedepayload_class->set_caps = gst_rtp_h264_depay_setcaps;
128 gstrtpbasedepayload_class->handle_event = gst_rtp_h264_depay_handle_event;
129 }
130
131 static void
gst_rtp_h264_depay_init(GstRtpH264Depay * rtph264depay)132 gst_rtp_h264_depay_init (GstRtpH264Depay * rtph264depay)
133 {
134 rtph264depay->adapter = gst_adapter_new ();
135 rtph264depay->picture_adapter = gst_adapter_new ();
136 rtph264depay->byte_stream = DEFAULT_BYTE_STREAM;
137 rtph264depay->merge = DEFAULT_ACCESS_UNIT;
138 rtph264depay->sps = g_ptr_array_new_with_free_func (
139 (GDestroyNotify) gst_buffer_unref);
140 rtph264depay->pps = g_ptr_array_new_with_free_func (
141 (GDestroyNotify) gst_buffer_unref);
142 }
143
144 static void
gst_rtp_h264_depay_reset(GstRtpH264Depay * rtph264depay,gboolean hard)145 gst_rtp_h264_depay_reset (GstRtpH264Depay * rtph264depay, gboolean hard)
146 {
147 gst_adapter_clear (rtph264depay->adapter);
148 rtph264depay->wait_start = TRUE;
149 gst_adapter_clear (rtph264depay->picture_adapter);
150 rtph264depay->picture_start = FALSE;
151 rtph264depay->last_keyframe = FALSE;
152 rtph264depay->last_ts = 0;
153 rtph264depay->current_fu_type = 0;
154 rtph264depay->new_codec_data = FALSE;
155 g_ptr_array_set_size (rtph264depay->sps, 0);
156 g_ptr_array_set_size (rtph264depay->pps, 0);
157
158 if (hard) {
159 if (rtph264depay->allocator != NULL) {
160 gst_object_unref (rtph264depay->allocator);
161 rtph264depay->allocator = NULL;
162 }
163 gst_allocation_params_init (&rtph264depay->params);
164 }
165 }
166
167 static void
gst_rtp_h264_depay_drain(GstRtpH264Depay * rtph264depay)168 gst_rtp_h264_depay_drain (GstRtpH264Depay * rtph264depay)
169 {
170 GstClockTime timestamp;
171 gboolean keyframe;
172 GstBuffer *outbuf;
173
174 if (!rtph264depay->picture_start)
175 return;
176
177 outbuf = gst_rtp_h264_complete_au (rtph264depay, ×tamp, &keyframe);
178 if (outbuf)
179 gst_rtp_h264_depay_push (rtph264depay, outbuf, keyframe, timestamp, FALSE);
180 }
181
182 static void
gst_rtp_h264_depay_finalize(GObject * object)183 gst_rtp_h264_depay_finalize (GObject * object)
184 {
185 GstRtpH264Depay *rtph264depay;
186
187 rtph264depay = GST_RTP_H264_DEPAY (object);
188
189 if (rtph264depay->codec_data)
190 gst_buffer_unref (rtph264depay->codec_data);
191
192 g_object_unref (rtph264depay->adapter);
193 g_object_unref (rtph264depay->picture_adapter);
194
195 g_ptr_array_free (rtph264depay->sps, TRUE);
196 g_ptr_array_free (rtph264depay->pps, TRUE);
197
198 G_OBJECT_CLASS (parent_class)->finalize (object);
199 }
200
201 static void
gst_rtp_h264_depay_negotiate(GstRtpH264Depay * rtph264depay)202 gst_rtp_h264_depay_negotiate (GstRtpH264Depay * rtph264depay)
203 {
204 GstCaps *caps;
205 gint byte_stream = -1;
206 gint merge = -1;
207
208 caps =
209 gst_pad_get_allowed_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay));
210
211 GST_DEBUG_OBJECT (rtph264depay, "allowed caps: %" GST_PTR_FORMAT, caps);
212
213 if (caps) {
214 if (gst_caps_get_size (caps) > 0) {
215 GstStructure *s = gst_caps_get_structure (caps, 0);
216 const gchar *str = NULL;
217
218 if ((str = gst_structure_get_string (s, "stream-format"))) {
219 if (strcmp (str, "avc") == 0) {
220 byte_stream = FALSE;
221 } else if (strcmp (str, "byte-stream") == 0) {
222 byte_stream = TRUE;
223 } else {
224 GST_DEBUG_OBJECT (rtph264depay, "unknown stream-format: %s", str);
225 }
226 }
227
228 if ((str = gst_structure_get_string (s, "alignment"))) {
229 if (strcmp (str, "au") == 0) {
230 merge = TRUE;
231 } else if (strcmp (str, "nal") == 0) {
232 merge = FALSE;
233 } else {
234 GST_DEBUG_OBJECT (rtph264depay, "unknown alignment: %s", str);
235 }
236 }
237 }
238 gst_caps_unref (caps);
239 }
240
241 if (byte_stream != -1) {
242 GST_DEBUG_OBJECT (rtph264depay, "downstream requires byte-stream %d",
243 byte_stream);
244 rtph264depay->byte_stream = byte_stream;
245 } else {
246 GST_DEBUG_OBJECT (rtph264depay, "defaulting to byte-stream %d",
247 DEFAULT_BYTE_STREAM);
248 rtph264depay->byte_stream = DEFAULT_BYTE_STREAM;
249 }
250 if (merge != -1) {
251 GST_DEBUG_OBJECT (rtph264depay, "downstream requires merge %d", merge);
252 rtph264depay->merge = merge;
253 } else {
254 GST_DEBUG_OBJECT (rtph264depay, "defaulting to merge %d",
255 DEFAULT_ACCESS_UNIT);
256 rtph264depay->merge = DEFAULT_ACCESS_UNIT;
257 }
258 }
259
260 static gboolean
parse_sps(GstMapInfo * map,guint32 * sps_id)261 parse_sps (GstMapInfo * map, guint32 * sps_id)
262 {
263 GstBitReader br = GST_BIT_READER_INIT (map->data + 4,
264 map->size - 4);
265
266 if (map->size < 5)
267 return FALSE;
268
269 if (!gst_rtp_read_golomb (&br, sps_id))
270 return FALSE;
271
272 return TRUE;
273 }
274
275 static gboolean
parse_pps(GstMapInfo * map,guint32 * sps_id,guint32 * pps_id)276 parse_pps (GstMapInfo * map, guint32 * sps_id, guint32 * pps_id)
277 {
278 GstBitReader br = GST_BIT_READER_INIT (map->data + 1,
279 map->size - 1);
280
281 if (map->size < 2)
282 return FALSE;
283
284 if (!gst_rtp_read_golomb (&br, pps_id))
285 return FALSE;
286 if (!gst_rtp_read_golomb (&br, sps_id))
287 return FALSE;
288
289 return TRUE;
290 }
291
292 static gboolean
gst_rtp_h264_depay_set_output_caps(GstRtpH264Depay * rtph264depay,GstCaps * caps)293 gst_rtp_h264_depay_set_output_caps (GstRtpH264Depay * rtph264depay,
294 GstCaps * caps)
295 {
296 GstAllocationParams params;
297 GstAllocator *allocator = NULL;
298 GstPad *srcpad;
299 gboolean res;
300
301 gst_allocation_params_init (¶ms);
302
303 srcpad = GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay);
304 res = gst_pad_set_caps (srcpad, caps);
305 if (res) {
306 GstQuery *query;
307
308 query = gst_query_new_allocation (caps, TRUE);
309 if (!gst_pad_peer_query (srcpad, query)) {
310 GST_DEBUG_OBJECT (rtph264depay, "downstream ALLOCATION query failed");
311 }
312
313 if (gst_query_get_n_allocation_params (query) > 0) {
314 gst_query_parse_nth_allocation_param (query, 0, &allocator, ¶ms);
315 }
316
317 gst_query_unref (query);
318 }
319
320 if (rtph264depay->allocator)
321 gst_object_unref (rtph264depay->allocator);
322
323 rtph264depay->allocator = allocator;
324 rtph264depay->params = params;
325
326 return res;
327 }
328
329 static gboolean
gst_rtp_h264_set_src_caps(GstRtpH264Depay * rtph264depay)330 gst_rtp_h264_set_src_caps (GstRtpH264Depay * rtph264depay)
331 {
332 gboolean res = TRUE;
333 GstCaps *srccaps;
334 GstCaps *old_caps;
335 GstPad *srcpad;
336
337 if (!rtph264depay->byte_stream &&
338 (!rtph264depay->new_codec_data ||
339 rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0))
340 return TRUE;
341
342 srccaps = gst_caps_new_simple ("video/x-h264",
343 "stream-format", G_TYPE_STRING,
344 rtph264depay->byte_stream ? "byte-stream" : "avc",
345 "alignment", G_TYPE_STRING, rtph264depay->merge ? "au" : "nal", NULL);
346
347 if (!rtph264depay->byte_stream) {
348 GstBuffer *codec_data;
349 GstMapInfo map;
350 GstMapInfo nalmap;
351 guint8 *data;
352 guint len;
353 guint new_size;
354 guint i;
355 guchar level = 0;
356 guchar profile_compat = G_MAXUINT8;
357
358 /* start with 7 bytes header */
359 len = 7;
360 /* count sps & pps */
361 for (i = 0; i < rtph264depay->sps->len; i++)
362 len += 2 + gst_buffer_get_size (g_ptr_array_index (rtph264depay->sps, i));
363 for (i = 0; i < rtph264depay->pps->len; i++)
364 len += 2 + gst_buffer_get_size (g_ptr_array_index (rtph264depay->pps, i));
365
366 codec_data = gst_buffer_new_and_alloc (len);
367 gst_buffer_map (codec_data, &map, GST_MAP_READWRITE);
368 data = map.data;
369
370 /* 8 bits version == 1 */
371 *data++ = 1;
372
373 /* According to: ISO/IEC 14496-15:2004(E) section 5.2.4.1
374 * The level is the max level of all SPSes
375 * A profile compat bit can only be set if all SPSes include that bit
376 */
377 for (i = 0; i < rtph264depay->sps->len; i++) {
378 gst_buffer_map (g_ptr_array_index (rtph264depay->sps, i), &nalmap,
379 GST_MAP_READ);
380 profile_compat &= nalmap.data[2];
381 level = MAX (level, nalmap.data[3]);
382 gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, i), &nalmap);
383 }
384
385 /* Assume all SPSes use the same profile, so extract from the first SPS */
386 gst_buffer_map (g_ptr_array_index (rtph264depay->sps, 0), &nalmap,
387 GST_MAP_READ);
388 *data++ = nalmap.data[1];
389 gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, 0), &nalmap);
390 *data++ = profile_compat;
391 *data++ = level;
392
393 /* 6 bits reserved | 2 bits lengthSizeMinusOn */
394 *data++ = 0xff;
395 /* 3 bits reserved | 5 bits numOfSequenceParameterSets */
396 *data++ = 0xe0 | (rtph264depay->sps->len & 0x1f);
397
398 /* copy all SPS */
399 for (i = 0; i < rtph264depay->sps->len; i++) {
400 gst_buffer_map (g_ptr_array_index (rtph264depay->sps, i), &nalmap,
401 GST_MAP_READ);
402
403 GST_DEBUG_OBJECT (rtph264depay, "copy SPS %d of length %u", i,
404 (guint) nalmap.size);
405 GST_WRITE_UINT16_BE (data, nalmap.size);
406 data += 2;
407 memcpy (data, nalmap.data, nalmap.size);
408 data += nalmap.size;
409 gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, i), &nalmap);
410 }
411
412 /* 8 bits numOfPictureParameterSets */
413 *data++ = rtph264depay->pps->len;
414 /* copy all PPS */
415 for (i = 0; i < rtph264depay->pps->len; i++) {
416 gst_buffer_map (g_ptr_array_index (rtph264depay->pps, i), &nalmap,
417 GST_MAP_READ);
418
419 GST_DEBUG_OBJECT (rtph264depay, "copy PPS %d of length %u", i,
420 (guint) nalmap.size);
421 GST_WRITE_UINT16_BE (data, nalmap.size);
422 data += 2;
423 memcpy (data, nalmap.data, nalmap.size);
424 data += nalmap.size;
425 gst_buffer_unmap (g_ptr_array_index (rtph264depay->pps, i), &nalmap);
426 }
427
428 new_size = data - map.data;
429 gst_buffer_unmap (codec_data, &map);
430 gst_buffer_set_size (codec_data, new_size);
431
432 gst_caps_set_simple (srccaps,
433 "codec_data", GST_TYPE_BUFFER, codec_data, NULL);
434 gst_buffer_unref (codec_data);
435 }
436
437 /* Set profile a level from SPS */
438 {
439 gint i;
440 GstBuffer *max_level_sps = NULL;
441 gint level = 0;
442 GstMapInfo nalmap;
443
444 /* Get the SPS with the highest level. We assume
445 * all SPS have the same profile */
446 for (i = 0; i < rtph264depay->sps->len; i++) {
447 gst_buffer_map (g_ptr_array_index (rtph264depay->sps, i), &nalmap,
448 GST_MAP_READ);
449 if (level == 0 || level < nalmap.data[3]) {
450 max_level_sps = g_ptr_array_index (rtph264depay->sps, i);
451 level = nalmap.data[3];
452 }
453 gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, i), &nalmap);
454 }
455
456 if (max_level_sps) {
457 gst_buffer_map (max_level_sps, &nalmap, GST_MAP_READ);
458 gst_codec_utils_h264_caps_set_level_and_profile (srccaps, nalmap.data + 1,
459 nalmap.size - 1);
460 gst_buffer_unmap (max_level_sps, &nalmap);
461 }
462 }
463
464 srcpad = GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay);
465
466 old_caps = gst_pad_get_current_caps (srcpad);
467
468 if (old_caps == NULL || !gst_caps_is_equal (srccaps, old_caps)) {
469 res = gst_rtp_h264_depay_set_output_caps (rtph264depay, srccaps);
470 }
471
472 gst_clear_caps (&old_caps);
473 gst_caps_unref (srccaps);
474
475 /* Insert SPS and PPS into the stream on next opportunity (if bytestream) */
476 if (rtph264depay->byte_stream
477 && (rtph264depay->sps->len > 0 || rtph264depay->pps->len > 0)) {
478 gint i;
479 GstBuffer *codec_data;
480 GstMapInfo map;
481 guint8 *data;
482 guint len = 0;
483
484 for (i = 0; i < rtph264depay->sps->len; i++) {
485 len += 4 + gst_buffer_get_size (g_ptr_array_index (rtph264depay->sps, i));
486 }
487
488 for (i = 0; i < rtph264depay->pps->len; i++) {
489 len += 4 + gst_buffer_get_size (g_ptr_array_index (rtph264depay->pps, i));
490 }
491
492 codec_data = gst_buffer_new_and_alloc (len);
493 gst_buffer_map (codec_data, &map, GST_MAP_WRITE);
494 data = map.data;
495
496 for (i = 0; i < rtph264depay->sps->len; i++) {
497 GstBuffer *sps_buf = g_ptr_array_index (rtph264depay->sps, i);
498 guint sps_size = gst_buffer_get_size (sps_buf);
499
500 if (rtph264depay->byte_stream)
501 memcpy (data, sync_bytes, sizeof (sync_bytes));
502 else
503 GST_WRITE_UINT32_BE (data, sps_size);
504 gst_buffer_extract (sps_buf, 0, data + 4, -1);
505 data += 4 + sps_size;
506 }
507
508 for (i = 0; i < rtph264depay->pps->len; i++) {
509 GstBuffer *pps_buf = g_ptr_array_index (rtph264depay->pps, i);
510 guint pps_size = gst_buffer_get_size (pps_buf);
511
512 if (rtph264depay->byte_stream)
513 memcpy (data, sync_bytes, sizeof (sync_bytes));
514 else
515 GST_WRITE_UINT32_BE (data, pps_size);
516 gst_buffer_extract (pps_buf, 0, data + 4, -1);
517 data += 4 + pps_size;
518 }
519
520 gst_buffer_unmap (codec_data, &map);
521 if (rtph264depay->codec_data)
522 gst_buffer_unref (rtph264depay->codec_data);
523 rtph264depay->codec_data = codec_data;
524 }
525
526 if (res)
527 rtph264depay->new_codec_data = FALSE;
528
529 return res;
530 }
531
532 gboolean
gst_rtp_h264_add_sps_pps(GstElement * rtph264,GPtrArray * sps_array,GPtrArray * pps_array,GstBuffer * nal)533 gst_rtp_h264_add_sps_pps (GstElement * rtph264, GPtrArray * sps_array,
534 GPtrArray * pps_array, GstBuffer * nal)
535 {
536 GstMapInfo map;
537 guchar type;
538 guint i;
539
540 gst_buffer_map (nal, &map, GST_MAP_READ);
541
542 type = map.data[0] & 0x1f;
543
544 if (type == 7) {
545 guint32 sps_id;
546
547 if (!parse_sps (&map, &sps_id)) {
548 GST_WARNING_OBJECT (rtph264, "Invalid SPS,"
549 " can't parse seq_parameter_set_id");
550 goto drop;
551 }
552
553 for (i = 0; i < sps_array->len; i++) {
554 GstBuffer *sps = g_ptr_array_index (sps_array, i);
555 GstMapInfo spsmap;
556 guint32 tmp_sps_id;
557
558 gst_buffer_map (sps, &spsmap, GST_MAP_READ);
559 parse_sps (&spsmap, &tmp_sps_id);
560
561 if (sps_id == tmp_sps_id) {
562 if (map.size == spsmap.size &&
563 memcmp (map.data, spsmap.data, spsmap.size) == 0) {
564 GST_LOG_OBJECT (rtph264, "Unchanged SPS %u, not updating", sps_id);
565 gst_buffer_unmap (sps, &spsmap);
566 goto drop;
567 } else {
568 gst_buffer_unmap (sps, &spsmap);
569 g_ptr_array_remove_index_fast (sps_array, i);
570 g_ptr_array_add (sps_array, nal);
571 GST_LOG_OBJECT (rtph264, "Modified SPS %u, replacing", sps_id);
572 goto done;
573 }
574 }
575 gst_buffer_unmap (sps, &spsmap);
576 }
577 GST_LOG_OBJECT (rtph264, "Adding new SPS %u", sps_id);
578 g_ptr_array_add (sps_array, nal);
579 } else if (type == 8) {
580 guint32 sps_id;
581 guint32 pps_id;
582
583 if (!parse_pps (&map, &sps_id, &pps_id)) {
584 GST_WARNING_OBJECT (rtph264, "Invalid PPS,"
585 " can't parse seq_parameter_set_id or pic_parameter_set_id");
586 goto drop;
587 }
588
589 for (i = 0; i < pps_array->len; i++) {
590 GstBuffer *pps = g_ptr_array_index (pps_array, i);
591 GstMapInfo ppsmap;
592 guint32 tmp_sps_id;
593 guint32 tmp_pps_id;
594
595
596 gst_buffer_map (pps, &ppsmap, GST_MAP_READ);
597 parse_pps (&ppsmap, &tmp_sps_id, &tmp_pps_id);
598
599 if (pps_id == tmp_pps_id) {
600 if (map.size == ppsmap.size &&
601 memcmp (map.data, ppsmap.data, ppsmap.size) == 0) {
602 GST_LOG_OBJECT (rtph264, "Unchanged PPS %u:%u, not updating", sps_id,
603 pps_id);
604 gst_buffer_unmap (pps, &ppsmap);
605 goto drop;
606 } else {
607 gst_buffer_unmap (pps, &ppsmap);
608 g_ptr_array_remove_index_fast (pps_array, i);
609 g_ptr_array_add (pps_array, nal);
610 GST_LOG_OBJECT (rtph264, "Modified PPS %u:%u, replacing",
611 sps_id, pps_id);
612 goto done;
613 }
614 }
615 gst_buffer_unmap (pps, &ppsmap);
616 }
617 GST_LOG_OBJECT (rtph264, "Adding new PPS %u:%i", sps_id, pps_id);
618 g_ptr_array_add (pps_array, nal);
619 } else {
620 goto drop;
621 }
622
623 done:
624 gst_buffer_unmap (nal, &map);
625
626 return TRUE;
627
628 drop:
629 gst_buffer_unmap (nal, &map);
630 gst_buffer_unref (nal);
631
632 return FALSE;
633 }
634
635
636 static void
gst_rtp_h264_depay_add_sps_pps(GstRtpH264Depay * rtph264depay,GstBuffer * nal)637 gst_rtp_h264_depay_add_sps_pps (GstRtpH264Depay * rtph264depay, GstBuffer * nal)
638 {
639 if (gst_rtp_h264_add_sps_pps (GST_ELEMENT (rtph264depay),
640 rtph264depay->sps, rtph264depay->pps, nal))
641 rtph264depay->new_codec_data = TRUE;
642 }
643
644 static gboolean
gst_rtp_h264_depay_setcaps(GstRTPBaseDepayload * depayload,GstCaps * caps)645 gst_rtp_h264_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
646 {
647 gint clock_rate;
648 GstStructure *structure = gst_caps_get_structure (caps, 0);
649 GstRtpH264Depay *rtph264depay;
650 const gchar *ps;
651 GstBuffer *codec_data;
652 GstMapInfo map;
653 guint8 *ptr;
654
655 rtph264depay = GST_RTP_H264_DEPAY (depayload);
656
657 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
658 clock_rate = 90000;
659 depayload->clock_rate = clock_rate;
660
661 /* Base64 encoded, comma separated config NALs */
662 ps = gst_structure_get_string (structure, "sprop-parameter-sets");
663
664 /* negotiate with downstream w.r.t. output format and alignment */
665 gst_rtp_h264_depay_negotiate (rtph264depay);
666
667 if (rtph264depay->byte_stream && ps != NULL) {
668 /* for bytestream we only need the parameter sets but we don't error out
669 * when they are not there, we assume they are in the stream. */
670 gchar **params;
671 guint len, total;
672 gint i;
673
674 params = g_strsplit (ps, ",", 0);
675
676 /* count total number of bytes in base64. Also include the sync bytes in
677 * front of the params. */
678 len = 0;
679 for (i = 0; params[i]; i++) {
680 len += strlen (params[i]);
681 len += sizeof (sync_bytes);
682 }
683 /* we seriously overshoot the length, but it's fine. */
684 codec_data = gst_buffer_new_and_alloc (len);
685
686 gst_buffer_map (codec_data, &map, GST_MAP_WRITE);
687 ptr = map.data;
688 total = 0;
689 for (i = 0; params[i]; i++) {
690 guint save = 0;
691 gint state = 0;
692
693 GST_DEBUG_OBJECT (depayload, "decoding param %d (%s)", i, params[i]);
694 memcpy (ptr, sync_bytes, sizeof (sync_bytes));
695 ptr += sizeof (sync_bytes);
696 len =
697 g_base64_decode_step (params[i], strlen (params[i]), ptr, &state,
698 &save);
699 GST_DEBUG_OBJECT (depayload, "decoded %d bytes", len);
700 total += len + sizeof (sync_bytes);
701 ptr += len;
702 }
703 gst_buffer_unmap (codec_data, &map);
704 gst_buffer_resize (codec_data, 0, total);
705 g_strfreev (params);
706
707 /* keep the codec_data, we need to send it as the first buffer. We cannot
708 * push it in the adapter because the adapter might be flushed on discont.
709 */
710 if (rtph264depay->codec_data)
711 gst_buffer_unref (rtph264depay->codec_data);
712 rtph264depay->codec_data = codec_data;
713 } else if (!rtph264depay->byte_stream) {
714 gchar **params;
715 gint i;
716
717 if (ps == NULL)
718 goto incomplete_caps;
719
720 params = g_strsplit (ps, ",", 0);
721
722 GST_DEBUG_OBJECT (depayload, "we have %d params", g_strv_length (params));
723
724 /* start with 7 bytes header */
725 for (i = 0; params[i]; i++) {
726 GstBuffer *nal;
727 GstMapInfo nalmap;
728 gsize nal_len;
729 guint save = 0;
730 gint state = 0;
731
732 nal_len = strlen (params[i]);
733 if (nal_len == 0) {
734 GST_WARNING_OBJECT (depayload, "empty param '%s' (#%d)", params[i], i);
735 continue;
736 }
737 nal = gst_buffer_new_and_alloc (nal_len);
738 gst_buffer_map (nal, &nalmap, GST_MAP_READWRITE);
739
740 nal_len =
741 g_base64_decode_step (params[i], nal_len, nalmap.data, &state, &save);
742
743 GST_DEBUG_OBJECT (depayload, "adding param %d as %s", i,
744 ((nalmap.data[0] & 0x1f) == 7) ? "SPS" : "PPS");
745
746 gst_buffer_unmap (nal, &nalmap);
747 gst_buffer_set_size (nal, nal_len);
748
749 gst_rtp_h264_depay_add_sps_pps (rtph264depay, nal);
750 }
751 g_strfreev (params);
752
753 if (rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0)
754 goto incomplete_caps;
755 }
756
757 return gst_rtp_h264_set_src_caps (rtph264depay);
758
759 /* ERRORS */
760 incomplete_caps:
761 {
762 GST_DEBUG_OBJECT (depayload, "we have incomplete caps,"
763 " doing setcaps later");
764 return TRUE;
765 }
766 }
767
768 static GstBuffer *
gst_rtp_h264_depay_allocate_output_buffer(GstRtpH264Depay * depay,gsize size)769 gst_rtp_h264_depay_allocate_output_buffer (GstRtpH264Depay * depay, gsize size)
770 {
771 GstBuffer *buffer = NULL;
772
773 g_return_val_if_fail (size > 0, NULL);
774
775 GST_LOG_OBJECT (depay, "want output buffer of %u bytes", (guint) size);
776
777 buffer = gst_buffer_new_allocate (depay->allocator, size, &depay->params);
778 if (buffer == NULL) {
779 GST_INFO_OBJECT (depay, "couldn't allocate output buffer");
780 buffer = gst_buffer_new_allocate (NULL, size, NULL);
781 }
782
783 return buffer;
784 }
785
786 static GstBuffer *
gst_rtp_h264_complete_au(GstRtpH264Depay * rtph264depay,GstClockTime * out_timestamp,gboolean * out_keyframe)787 gst_rtp_h264_complete_au (GstRtpH264Depay * rtph264depay,
788 GstClockTime * out_timestamp, gboolean * out_keyframe)
789 {
790 GstBufferList *list;
791 GstMapInfo outmap;
792 GstBuffer *outbuf;
793 guint outsize, offset = 0;
794 gint b, n_bufs, m, n_mem;
795
796 /* we had a picture in the adapter and we completed it */
797 GST_DEBUG_OBJECT (rtph264depay, "taking completed AU");
798 outsize = gst_adapter_available (rtph264depay->picture_adapter);
799
800 outbuf = gst_rtp_h264_depay_allocate_output_buffer (rtph264depay, outsize);
801
802 if (outbuf == NULL)
803 return NULL;
804
805 if (!gst_buffer_map (outbuf, &outmap, GST_MAP_WRITE))
806 return NULL;
807
808 list = gst_adapter_take_buffer_list (rtph264depay->picture_adapter, outsize);
809
810 n_bufs = gst_buffer_list_length (list);
811 for (b = 0; b < n_bufs; ++b) {
812 GstBuffer *buf = gst_buffer_list_get (list, b);
813
814 n_mem = gst_buffer_n_memory (buf);
815 for (m = 0; m < n_mem; ++m) {
816 GstMemory *mem = gst_buffer_peek_memory (buf, m);
817 gsize mem_size = gst_memory_get_sizes (mem, NULL, NULL);
818 GstMapInfo mem_map;
819
820 if (gst_memory_map (mem, &mem_map, GST_MAP_READ)) {
821 memcpy (outmap.data + offset, mem_map.data, mem_size);
822 gst_memory_unmap (mem, &mem_map);
823 } else {
824 memset (outmap.data + offset, 0, mem_size);
825 }
826 offset += mem_size;
827 }
828
829 gst_rtp_copy_video_meta (rtph264depay, outbuf, buf);
830 }
831 gst_buffer_list_unref (list);
832 gst_buffer_unmap (outbuf, &outmap);
833
834 *out_timestamp = rtph264depay->last_ts;
835 *out_keyframe = rtph264depay->last_keyframe;
836
837 rtph264depay->last_keyframe = FALSE;
838 rtph264depay->picture_start = FALSE;
839
840 return outbuf;
841 }
842
843 static void
gst_rtp_h264_depay_push(GstRtpH264Depay * rtph264depay,GstBuffer * outbuf,gboolean keyframe,GstClockTime timestamp,gboolean marker)844 gst_rtp_h264_depay_push (GstRtpH264Depay * rtph264depay, GstBuffer * outbuf,
845 gboolean keyframe, GstClockTime timestamp, gboolean marker)
846 {
847 /* prepend codec_data */
848 if (rtph264depay->codec_data) {
849 GST_DEBUG_OBJECT (rtph264depay, "prepending codec_data");
850 gst_rtp_copy_video_meta (rtph264depay, rtph264depay->codec_data, outbuf);
851 outbuf = gst_buffer_append (rtph264depay->codec_data, outbuf);
852 rtph264depay->codec_data = NULL;
853 keyframe = TRUE;
854 }
855 outbuf = gst_buffer_make_writable (outbuf);
856
857 gst_rtp_drop_non_video_meta (rtph264depay, outbuf);
858
859 GST_BUFFER_PTS (outbuf) = timestamp;
860
861 if (keyframe)
862 GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
863 else
864 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
865
866 if (marker)
867 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_MARKER);
868
869 gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtph264depay), outbuf);
870 }
871
872 /* SPS/PPS/IDR considered key, all others DELTA;
873 * so downstream waiting for keyframe can pick up at SPS/PPS/IDR */
874 #define NAL_TYPE_IS_KEY(nt) (((nt) == 5) || ((nt) == 7) || ((nt) == 8))
875
876 static void
gst_rtp_h264_depay_handle_nal(GstRtpH264Depay * rtph264depay,GstBuffer * nal,GstClockTime in_timestamp,gboolean marker)877 gst_rtp_h264_depay_handle_nal (GstRtpH264Depay * rtph264depay, GstBuffer * nal,
878 GstClockTime in_timestamp, gboolean marker)
879 {
880 GstRTPBaseDepayload *depayload = GST_RTP_BASE_DEPAYLOAD (rtph264depay);
881 gint nal_type;
882 GstMapInfo map;
883 GstBuffer *outbuf = NULL;
884 GstClockTime out_timestamp;
885 gboolean keyframe, out_keyframe;
886
887 gst_buffer_map (nal, &map, GST_MAP_READ);
888 if (G_UNLIKELY (map.size < 5))
889 goto short_nal;
890
891 nal_type = map.data[4] & 0x1f;
892 GST_DEBUG_OBJECT (rtph264depay, "handle NAL type %d", nal_type);
893
894 keyframe = NAL_TYPE_IS_KEY (nal_type);
895
896 out_keyframe = keyframe;
897 out_timestamp = in_timestamp;
898
899 if (!rtph264depay->byte_stream) {
900 if (nal_type == 7 || nal_type == 8) {
901 gst_rtp_h264_depay_add_sps_pps (rtph264depay,
902 gst_buffer_copy_region (nal, GST_BUFFER_COPY_ALL,
903 4, gst_buffer_get_size (nal) - 4));
904 gst_buffer_unmap (nal, &map);
905 gst_buffer_unref (nal);
906 return;
907 } else if (rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0) {
908 /* Down push down any buffer in non-bytestream mode if the SPS/PPS haven't
909 * go through yet
910 */
911 gst_pad_push_event (GST_RTP_BASE_DEPAYLOAD_SINKPAD (depayload),
912 gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM,
913 gst_structure_new ("GstForceKeyUnit",
914 "all-headers", G_TYPE_BOOLEAN, TRUE, NULL)));
915 gst_buffer_unmap (nal, &map);
916 gst_buffer_unref (nal);
917 return;
918 }
919
920 if (rtph264depay->new_codec_data &&
921 rtph264depay->sps->len > 0 && rtph264depay->pps->len > 0)
922 gst_rtp_h264_set_src_caps (rtph264depay);
923 }
924
925
926 if (rtph264depay->merge) {
927 gboolean start = FALSE, complete = FALSE;
928
929 /* marker bit isn't mandatory so in the following code we try to guess
930 * an AU boundary by detecting a new picture start */
931 if (!marker) {
932 /* consider a coded slices (IDR or not) to start a picture,
933 * (so ending the previous one) if first_mb_in_slice == 0
934 * (non-0 is part of previous one) */
935 /* NOTE this is not entirely according to Access Unit specs in 7.4.1.2.4,
936 * but in practice it works in sane cases, needs not much parsing,
937 * and also works with broken frame_num in NAL (where spec-wise would fail) */
938 /* FIXME: this code isn't correct for interlaced content as AUs should be
939 * constructed with pairs of fields and the guess here will just push out
940 * AUs with a single field in it */
941 if (nal_type == 1 || nal_type == 2 || nal_type == 5) {
942 /* we have a picture start */
943 start = TRUE;
944 if (map.data[5] & 0x80) {
945 /* first_mb_in_slice == 0 completes a picture */
946 complete = TRUE;
947 }
948 } else if (nal_type >= 6 && nal_type <= 9) {
949 /* SEI, SPS, PPS, AU terminate picture */
950 complete = TRUE;
951 }
952 GST_DEBUG_OBJECT (depayload, "start %d, complete %d", start, complete);
953
954 if (complete && rtph264depay->picture_start)
955 outbuf = gst_rtp_h264_complete_au (rtph264depay, &out_timestamp,
956 &out_keyframe);
957 }
958 /* add to adapter */
959 gst_buffer_unmap (nal, &map);
960
961 GST_DEBUG_OBJECT (depayload, "adding NAL to picture adapter");
962 gst_adapter_push (rtph264depay->picture_adapter, nal);
963 rtph264depay->last_ts = in_timestamp;
964 rtph264depay->last_keyframe |= keyframe;
965 rtph264depay->picture_start |= start;
966
967 if (marker)
968 outbuf = gst_rtp_h264_complete_au (rtph264depay, &out_timestamp,
969 &out_keyframe);
970 } else {
971 /* no merge, output is input nal */
972 GST_DEBUG_OBJECT (depayload, "using NAL as output");
973 outbuf = nal;
974 gst_buffer_unmap (nal, &map);
975 }
976
977 if (outbuf) {
978 gst_rtp_h264_depay_push (rtph264depay, outbuf, out_keyframe, out_timestamp,
979 marker);
980 }
981
982 return;
983
984 /* ERRORS */
985 short_nal:
986 {
987 GST_WARNING_OBJECT (depayload, "dropping short NAL");
988 gst_buffer_unmap (nal, &map);
989 gst_buffer_unref (nal);
990 return;
991 }
992 }
993
994 static void
gst_rtp_h264_finish_fragmentation_unit(GstRtpH264Depay * rtph264depay)995 gst_rtp_h264_finish_fragmentation_unit (GstRtpH264Depay * rtph264depay)
996 {
997 guint outsize;
998 GstMapInfo map;
999 GstBuffer *outbuf;
1000
1001 outsize = gst_adapter_available (rtph264depay->adapter);
1002 outbuf = gst_adapter_take_buffer (rtph264depay->adapter, outsize);
1003
1004 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
1005 GST_DEBUG_OBJECT (rtph264depay, "output %d bytes", outsize);
1006
1007 if (rtph264depay->byte_stream) {
1008 memcpy (map.data, sync_bytes, sizeof (sync_bytes));
1009 } else {
1010 outsize -= 4;
1011 map.data[0] = (outsize >> 24);
1012 map.data[1] = (outsize >> 16);
1013 map.data[2] = (outsize >> 8);
1014 map.data[3] = (outsize);
1015 }
1016 gst_buffer_unmap (outbuf, &map);
1017
1018 rtph264depay->current_fu_type = 0;
1019
1020 gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf,
1021 rtph264depay->fu_timestamp, rtph264depay->fu_marker);
1022 }
1023
1024 static GstBuffer *
gst_rtp_h264_depay_process(GstRTPBaseDepayload * depayload,GstRTPBuffer * rtp)1025 gst_rtp_h264_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
1026 {
1027 GstRtpH264Depay *rtph264depay;
1028 GstBuffer *outbuf = NULL;
1029 guint8 nal_unit_type;
1030
1031 rtph264depay = GST_RTP_H264_DEPAY (depayload);
1032
1033 /* flush remaining data on discont */
1034 if (GST_BUFFER_IS_DISCONT (rtp->buffer)) {
1035 gst_adapter_clear (rtph264depay->adapter);
1036 rtph264depay->wait_start = TRUE;
1037 rtph264depay->current_fu_type = 0;
1038 }
1039
1040 {
1041 gint payload_len;
1042 guint8 *payload;
1043 guint header_len;
1044 guint8 nal_ref_idc;
1045 GstMapInfo map;
1046 guint outsize, nalu_size;
1047 GstClockTime timestamp;
1048 gboolean marker;
1049
1050 timestamp = GST_BUFFER_PTS (rtp->buffer);
1051
1052 payload_len = gst_rtp_buffer_get_payload_len (rtp);
1053 payload = gst_rtp_buffer_get_payload (rtp);
1054 marker = gst_rtp_buffer_get_marker (rtp);
1055
1056 GST_DEBUG_OBJECT (rtph264depay, "receiving %d bytes", payload_len);
1057
1058 if (payload_len == 0)
1059 goto empty_packet;
1060
1061 /* +---------------+
1062 * |0|1|2|3|4|5|6|7|
1063 * +-+-+-+-+-+-+-+-+
1064 * |F|NRI| Type |
1065 * +---------------+
1066 *
1067 * F must be 0.
1068 */
1069 nal_ref_idc = (payload[0] & 0x60) >> 5;
1070 nal_unit_type = payload[0] & 0x1f;
1071
1072 /* at least one byte header with type */
1073 header_len = 1;
1074
1075 GST_DEBUG_OBJECT (rtph264depay, "NRI %d, Type %d %s", nal_ref_idc,
1076 nal_unit_type, marker ? "marker" : "");
1077
1078 /* If FU unit was being processed, but the current nal is of a different
1079 * type. Assume that the remote payloader is buggy (didn't set the end bit
1080 * when the FU ended) and send out what we gathered thusfar */
1081 if (G_UNLIKELY (rtph264depay->current_fu_type != 0 &&
1082 nal_unit_type != rtph264depay->current_fu_type))
1083 gst_rtp_h264_finish_fragmentation_unit (rtph264depay);
1084
1085 switch (nal_unit_type) {
1086 case 0:
1087 case 30:
1088 case 31:
1089 /* undefined */
1090 goto undefined_type;
1091 case 25:
1092 /* STAP-B Single-time aggregation packet 5.7.1 */
1093 /* 2 byte extra header for DON */
1094 header_len += 2;
1095 /* fallthrough */
1096 case 24:
1097 {
1098 /* strip headers */
1099 payload += header_len;
1100 payload_len -= header_len;
1101
1102 rtph264depay->wait_start = FALSE;
1103
1104
1105 /* STAP-A Single-time aggregation packet 5.7.1 */
1106 while (payload_len > 2) {
1107 gboolean last = FALSE;
1108
1109 /* 1
1110 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1111 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1112 * | NALU Size |
1113 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1114 */
1115 nalu_size = (payload[0] << 8) | payload[1];
1116
1117 /* dont include nalu_size */
1118 if (nalu_size > (payload_len - 2))
1119 nalu_size = payload_len - 2;
1120
1121 outsize = nalu_size + sizeof (sync_bytes);
1122 outbuf = gst_buffer_new_and_alloc (outsize);
1123
1124 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
1125 if (rtph264depay->byte_stream) {
1126 memcpy (map.data, sync_bytes, sizeof (sync_bytes));
1127 } else {
1128 map.data[0] = map.data[1] = 0;
1129 map.data[2] = payload[0];
1130 map.data[3] = payload[1];
1131 }
1132
1133 /* strip NALU size */
1134 payload += 2;
1135 payload_len -= 2;
1136
1137 memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
1138 gst_buffer_unmap (outbuf, &map);
1139
1140 gst_rtp_copy_video_meta (rtph264depay, outbuf, rtp->buffer);
1141
1142 if (payload_len - nalu_size <= 2)
1143 last = TRUE;
1144
1145 gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
1146 marker && last);
1147
1148 payload += nalu_size;
1149 payload_len -= nalu_size;
1150 }
1151 break;
1152 }
1153 case 26:
1154 /* MTAP16 Multi-time aggregation packet 5.7.2 */
1155 // header_len = 5;
1156 /* fallthrough, not implemented */
1157 case 27:
1158 /* MTAP24 Multi-time aggregation packet 5.7.2 */
1159 // header_len = 6;
1160 goto not_implemented;
1161 break;
1162 case 28:
1163 case 29:
1164 {
1165 /* FU-A Fragmentation unit 5.8 */
1166 /* FU-B Fragmentation unit 5.8 */
1167 gboolean S, E;
1168
1169 /* +---------------+
1170 * |0|1|2|3|4|5|6|7|
1171 * +-+-+-+-+-+-+-+-+
1172 * |S|E|R| Type |
1173 * +---------------+
1174 *
1175 * R is reserved and always 0
1176 */
1177 S = (payload[1] & 0x80) == 0x80;
1178 E = (payload[1] & 0x40) == 0x40;
1179
1180 GST_DEBUG_OBJECT (rtph264depay, "S %d, E %d", S, E);
1181
1182 if (rtph264depay->wait_start && !S)
1183 goto waiting_start;
1184
1185 if (S) {
1186 /* NAL unit starts here */
1187 guint8 nal_header;
1188
1189 /* If a new FU unit started, while still processing an older one.
1190 * Assume that the remote payloader is buggy (doesn't set the end
1191 * bit) and send out what we've gathered thusfar */
1192 if (G_UNLIKELY (rtph264depay->current_fu_type != 0))
1193 gst_rtp_h264_finish_fragmentation_unit (rtph264depay);
1194
1195 rtph264depay->current_fu_type = nal_unit_type;
1196 rtph264depay->fu_timestamp = timestamp;
1197
1198 rtph264depay->wait_start = FALSE;
1199
1200 /* reconstruct NAL header */
1201 nal_header = (payload[0] & 0xe0) | (payload[1] & 0x1f);
1202
1203 /* strip type header, keep FU header, we'll reuse it to reconstruct
1204 * the NAL header. */
1205 payload += 1;
1206 payload_len -= 1;
1207
1208 nalu_size = payload_len;
1209 outsize = nalu_size + sizeof (sync_bytes);
1210 outbuf = gst_buffer_new_and_alloc (outsize);
1211
1212 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
1213 memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
1214 map.data[sizeof (sync_bytes)] = nal_header;
1215 gst_buffer_unmap (outbuf, &map);
1216
1217 gst_rtp_copy_video_meta (rtph264depay, outbuf, rtp->buffer);
1218
1219 GST_DEBUG_OBJECT (rtph264depay, "queueing %d bytes", outsize);
1220
1221 /* and assemble in the adapter */
1222 gst_adapter_push (rtph264depay->adapter, outbuf);
1223 } else {
1224 /* strip off FU indicator and FU header bytes */
1225 payload += 2;
1226 payload_len -= 2;
1227
1228 outsize = payload_len;
1229 outbuf = gst_buffer_new_and_alloc (outsize);
1230 gst_buffer_fill (outbuf, 0, payload, outsize);
1231
1232 gst_rtp_copy_video_meta (rtph264depay, outbuf, rtp->buffer);
1233
1234 GST_DEBUG_OBJECT (rtph264depay, "queueing %d bytes", outsize);
1235
1236 /* and assemble in the adapter */
1237 gst_adapter_push (rtph264depay->adapter, outbuf);
1238 }
1239
1240 outbuf = NULL;
1241 rtph264depay->fu_marker = marker;
1242
1243 /* if NAL unit ends, flush the adapter */
1244 if (E)
1245 gst_rtp_h264_finish_fragmentation_unit (rtph264depay);
1246 break;
1247 }
1248 default:
1249 {
1250 rtph264depay->wait_start = FALSE;
1251
1252 /* 1-23 NAL unit Single NAL unit packet per H.264 5.6 */
1253 /* the entire payload is the output buffer */
1254 nalu_size = payload_len;
1255 outsize = nalu_size + sizeof (sync_bytes);
1256 outbuf = gst_buffer_new_and_alloc (outsize);
1257
1258 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
1259 if (rtph264depay->byte_stream) {
1260 memcpy (map.data, sync_bytes, sizeof (sync_bytes));
1261 } else {
1262 map.data[0] = map.data[1] = 0;
1263 map.data[2] = nalu_size >> 8;
1264 map.data[3] = nalu_size & 0xff;
1265 }
1266 memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
1267 gst_buffer_unmap (outbuf, &map);
1268
1269 gst_rtp_copy_video_meta (rtph264depay, outbuf, rtp->buffer);
1270
1271 gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp, marker);
1272 break;
1273 }
1274 }
1275 }
1276
1277 return NULL;
1278
1279 /* ERRORS */
1280 empty_packet:
1281 {
1282 GST_DEBUG_OBJECT (rtph264depay, "empty packet");
1283 return NULL;
1284 }
1285 undefined_type:
1286 {
1287 GST_ELEMENT_WARNING (rtph264depay, STREAM, DECODE,
1288 (NULL), ("Undefined packet type"));
1289 return NULL;
1290 }
1291 waiting_start:
1292 {
1293 GST_DEBUG_OBJECT (rtph264depay, "waiting for start");
1294 return NULL;
1295 }
1296 not_implemented:
1297 {
1298 GST_ELEMENT_ERROR (rtph264depay, STREAM, FORMAT,
1299 (NULL), ("NAL unit type %d not supported yet", nal_unit_type));
1300 return NULL;
1301 }
1302 }
1303
1304 static gboolean
gst_rtp_h264_depay_handle_event(GstRTPBaseDepayload * depay,GstEvent * event)1305 gst_rtp_h264_depay_handle_event (GstRTPBaseDepayload * depay, GstEvent * event)
1306 {
1307 GstRtpH264Depay *rtph264depay;
1308
1309 rtph264depay = GST_RTP_H264_DEPAY (depay);
1310
1311 switch (GST_EVENT_TYPE (event)) {
1312 case GST_EVENT_FLUSH_STOP:
1313 gst_rtp_h264_depay_reset (rtph264depay, FALSE);
1314 break;
1315 case GST_EVENT_EOS:
1316 gst_rtp_h264_depay_drain (rtph264depay);
1317 break;
1318 default:
1319 break;
1320 }
1321
1322 return
1323 GST_RTP_BASE_DEPAYLOAD_CLASS (parent_class)->handle_event (depay, event);
1324 }
1325
1326 static GstStateChangeReturn
gst_rtp_h264_depay_change_state(GstElement * element,GstStateChange transition)1327 gst_rtp_h264_depay_change_state (GstElement * element,
1328 GstStateChange transition)
1329 {
1330 GstRtpH264Depay *rtph264depay;
1331 GstStateChangeReturn ret;
1332
1333 rtph264depay = GST_RTP_H264_DEPAY (element);
1334
1335 switch (transition) {
1336 case GST_STATE_CHANGE_NULL_TO_READY:
1337 break;
1338 case GST_STATE_CHANGE_READY_TO_PAUSED:
1339 gst_rtp_h264_depay_reset (rtph264depay, TRUE);
1340 break;
1341 default:
1342 break;
1343 }
1344
1345 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1346
1347 switch (transition) {
1348 case GST_STATE_CHANGE_PAUSED_TO_READY:
1349 gst_rtp_h264_depay_reset (rtph264depay, TRUE);
1350 break;
1351 case GST_STATE_CHANGE_READY_TO_NULL:
1352 break;
1353 default:
1354 break;
1355 }
1356 return ret;
1357 }
1358
1359 gboolean
gst_rtp_h264_depay_plugin_init(GstPlugin * plugin)1360 gst_rtp_h264_depay_plugin_init (GstPlugin * plugin)
1361 {
1362 GST_DEBUG_CATEGORY_INIT (rtph264depay_debug, "rtph264depay", 0,
1363 "H264 Video RTP Depayloader");
1364
1365 return gst_element_register (plugin, "rtph264depay",
1366 GST_RANK_SECONDARY, GST_TYPE_RTP_H264_DEPAY);
1367 }
1368