1 /*****************************************************************************
2 * gstdecode.c: Decoder module making use of gstreamer
3 *****************************************************************************
4 * Copyright (C) 2014-2016 VLC authors and VideoLAN
5 * $Id:
6 *
7 * Author: Vikram Fugro <vikram.fugro@gmail.com>
8 *
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Library General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Library General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 *****************************************************************************/
23
24 /*****************************************************************************
25 * Preamble
26 *****************************************************************************/
27 #ifdef HAVE_CONFIG_H
28 # include "config.h"
29 #endif
30
31 #include <vlc_common.h>
32 #include <vlc_plugin.h>
33 #include <vlc_codec.h>
34
35 #include <gst/gst.h>
36 #include <gst/video/video.h>
37 #include <gst/video/gstvideometa.h>
38
39 #include <gst/app/gstappsrc.h>
40 #include <gst/gstatomicqueue.h>
41
42 #include "gstvlcpictureplaneallocator.h"
43 #include "gstvlcvideosink.h"
44
45 struct decoder_sys_t
46 {
47 GstElement *p_decoder;
48 GstElement *p_decode_src;
49 GstElement *p_decode_in;
50 GstElement *p_decode_out;
51
52 GstVlcPicturePlaneAllocator *p_allocator;
53
54 GstBus *p_bus;
55
56 GstVideoInfo vinfo;
57 GstAtomicQueue *p_que;
58 bool b_prerolled;
59 bool b_running;
60 };
61
62 typedef struct
63 {
64 GstCaps *p_sinkcaps;
65 GstCaps *p_srccaps;
66 } sink_src_caps_t;
67
68 /*****************************************************************************
69 * Local prototypes
70 *****************************************************************************/
71 static int OpenDecoder( vlc_object_t* );
72 static void CloseDecoder( vlc_object_t* );
73 static int DecodeBlock( decoder_t*, block_t* );
74 static void Flush( decoder_t * );
75
76 #define MODULE_DESCRIPTION N_( "Uses GStreamer framework's plugins " \
77 "to decode the media codecs" )
78
79 #define USEDECODEBIN_TEXT N_( "Use DecodeBin" )
80 #define USEDECODEBIN_LONGTEXT N_( \
81 "DecodeBin is a container element, that can add and " \
82 "manage multiple elements. Apart from adding the decoders, " \
83 "decodebin also adds elementary stream parsers which can provide " \
84 "more info such as codec profile, level and other attributes, " \
85 "in the form of GstCaps (Stream Capabilities) to decoder." )
86
87 vlc_module_begin( )
88 set_shortname( "GstDecode" )
89 add_shortcut( "gstdecode" )
set_category(CAT_INPUT)90 set_category( CAT_INPUT )
91 set_subcategory( SUBCAT_INPUT_VCODEC )
92 /* decoder main module */
93 set_description( N_( "GStreamer Based Decoder" ) )
94 set_help( MODULE_DESCRIPTION )
95 set_capability( "video decoder", 50 )
96 set_section( N_( "Decoding" ) , NULL )
97 set_callbacks( OpenDecoder, CloseDecoder )
98 add_bool( "use-decodebin", true, USEDECODEBIN_TEXT,
99 USEDECODEBIN_LONGTEXT, false )
100 vlc_module_end( )
101
102 void gst_vlc_dec_ensure_empty_queue( decoder_t *p_dec )
103 {
104 decoder_sys_t *p_sys = p_dec->p_sys;
105 int i_count = 0;
106
107 msg_Dbg( p_dec, "Ensuring the decoder queue is empty");
108
109 /* Busy wait with sleep; As this is rare case and the
110 * wait might at max go for 3-4 iterations, preferred to not
111 * to throw in a cond/lock here. */
112 while( p_sys->b_running && i_count < 60 &&
113 gst_atomic_queue_length( p_sys->p_que ))
114 {
115 msleep ( 15000 );
116 i_count++;
117 }
118
119 if( p_sys->b_running )
120 {
121 if( !gst_atomic_queue_length( p_sys->p_que ))
122 msg_Dbg( p_dec, "Ensured the decoder queue is empty" );
123 else
124 msg_Warn( p_dec, "Timed out when ensuring an empty queue" );
125 }
126 else
127 msg_Dbg( p_dec, "Ensuring empty decoder queue not required; decoder \
128 not running" );
129 }
130
131 /* Emitted by appsrc when serving a seek request.
132 * Seek over here is only used for flushing the buffers.
133 * Returns TRUE always, as the 'real' seek will be
134 * done by VLC framework */
seek_data_cb(GstAppSrc * p_src,guint64 l_offset,gpointer p_data)135 static gboolean seek_data_cb( GstAppSrc *p_src, guint64 l_offset,
136 gpointer p_data )
137 {
138 VLC_UNUSED( p_src );
139 decoder_t *p_dec = p_data;
140 msg_Dbg( p_dec, "appsrc seeking to %"G_GUINT64_FORMAT, l_offset );
141 return TRUE;
142 }
143
144 /* Emitted by decodebin and links decodebin to vlcvideosink.
145 * Since only one elementary codec stream is fed to decodebin,
146 * this signal cannot be emitted more than once. */
pad_added_cb(GstElement * p_ele,GstPad * p_pad,gpointer p_data)147 static void pad_added_cb( GstElement *p_ele, GstPad *p_pad, gpointer p_data )
148 {
149 VLC_UNUSED( p_ele );
150 decoder_t *p_dec = p_data;
151 decoder_sys_t *p_sys = p_dec->p_sys;
152
153 if( likely( gst_pad_has_current_caps( p_pad ) ) )
154 {
155 GstPadLinkReturn ret;
156 GstPad *p_sinkpad;
157
158 msg_Dbg( p_dec, "linking the decoder with the vsink");
159
160 p_sinkpad = gst_element_get_static_pad(
161 p_sys->p_decode_out, "sink" );
162 ret = gst_pad_link( p_pad, p_sinkpad );
163 if( ret != GST_PAD_LINK_OK )
164 msg_Err( p_dec, "failed to link decoder with vsink");
165
166 gst_object_unref( p_sinkpad );
167 }
168 else
169 {
170 msg_Err( p_dec, "decodebin src pad has no caps" );
171 GST_ELEMENT_ERROR( p_sys->p_decoder, STREAM, FAILED,
172 ( "vlc stream error" ), NULL );
173 }
174 }
175
caps_handoff_cb(GstElement * p_ele,GstCaps * p_caps,gpointer p_data)176 static gboolean caps_handoff_cb( GstElement* p_ele, GstCaps *p_caps,
177 gpointer p_data )
178 {
179 VLC_UNUSED( p_ele );
180 decoder_t *p_dec = p_data;
181 decoder_sys_t *p_sys = p_dec->p_sys;
182 GstVideoAlignment align;
183
184 msg_Info( p_dec, "got new caps %s", gst_caps_to_string( p_caps ));
185
186 if( !gst_video_info_from_caps( &p_sys->vinfo, p_caps ))
187 {
188 msg_Err( p_dec, "failed to negotiate" );
189 return FALSE;
190 }
191
192 gst_vlc_dec_ensure_empty_queue( p_dec );
193 gst_video_alignment_reset( &align );
194
195 return gst_vlc_set_vout_fmt( &p_sys->vinfo, &align, p_caps, p_dec );
196 }
197
198 /* Emitted by vlcvideosink for every buffer,
199 * Adds the buffer to the queue */
frame_handoff_cb(GstElement * p_ele,GstBuffer * p_buf,gpointer p_data)200 static void frame_handoff_cb( GstElement *p_ele, GstBuffer *p_buf,
201 gpointer p_data )
202 {
203 VLC_UNUSED( p_ele );
204 decoder_t *p_dec = p_data;
205 decoder_sys_t *p_sys = p_dec->p_sys;
206
207 /* Push the buffer to the queue */
208 gst_atomic_queue_push( p_sys->p_que, gst_buffer_ref( p_buf ) );
209 }
210
211 /* Copy the frame data from the GstBuffer (from decoder)
212 * to the picture obtained from downstream in VLC.
213 * This function should be avoided as much
214 * as possible, since it involves a complete frame copy. */
gst_CopyPicture(picture_t * p_pic,GstVideoFrame * p_frame)215 static void gst_CopyPicture( picture_t *p_pic, GstVideoFrame *p_frame )
216 {
217 int i_plane, i_planes, i_line, i_dst_stride, i_src_stride;
218 uint8_t *p_dst, *p_src;
219 int i_w, i_h;
220
221 i_planes = p_pic->i_planes;
222 for( i_plane = 0; i_plane < i_planes; i_plane++ )
223 {
224 p_dst = p_pic->p[i_plane].p_pixels;
225 p_src = GST_VIDEO_FRAME_PLANE_DATA( p_frame, i_plane );
226 i_dst_stride = p_pic->p[i_plane].i_pitch;
227 i_src_stride = GST_VIDEO_FRAME_PLANE_STRIDE( p_frame, i_plane );
228
229 i_w = GST_VIDEO_FRAME_COMP_WIDTH( p_frame,
230 i_plane ) * GST_VIDEO_FRAME_COMP_PSTRIDE( p_frame, i_plane );
231 i_h = GST_VIDEO_FRAME_COMP_HEIGHT( p_frame, i_plane );
232
233 for( i_line = 0;
234 i_line < __MIN( p_pic->p[i_plane].i_lines, i_h );
235 i_line++ )
236 {
237 memcpy( p_dst, p_src, i_w );
238 p_src += i_src_stride;
239 p_dst += i_dst_stride;
240 }
241 }
242 }
243
244 /* Check if the element can use this caps */
find_decoder_func(gconstpointer p_p1,gconstpointer p_p2)245 static gint find_decoder_func( gconstpointer p_p1, gconstpointer p_p2 )
246 {
247 GstElementFactory *p_factory;
248 sink_src_caps_t *p_caps;
249
250 p_factory = ( GstElementFactory* )p_p1;
251 p_caps = ( sink_src_caps_t* )p_p2;
252
253 return !( gst_element_factory_can_sink_any_caps( p_factory,
254 p_caps->p_sinkcaps ) &&
255 gst_element_factory_can_src_any_caps( p_factory,
256 p_caps->p_srccaps ));
257 }
258
default_msg_handler(decoder_t * p_dec,GstMessage * p_msg)259 static bool default_msg_handler( decoder_t *p_dec, GstMessage *p_msg )
260 {
261 bool err = false;
262
263 switch( GST_MESSAGE_TYPE( p_msg ) ){
264 case GST_MESSAGE_ERROR:
265 {
266 gchar *psz_debug;
267 GError *p_error;
268
269 gst_message_parse_error( p_msg, &p_error, &psz_debug );
270 g_free( psz_debug );
271
272 msg_Err( p_dec, "Error from %s: %s",
273 GST_ELEMENT_NAME( GST_MESSAGE_SRC( p_msg ) ),
274 p_error->message );
275 g_error_free( p_error );
276 err = true;
277 }
278 break;
279 case GST_MESSAGE_WARNING:
280 {
281 gchar *psz_debug;
282 GError *p_error;
283
284 gst_message_parse_warning( p_msg, &p_error, &psz_debug );
285 g_free( psz_debug );
286
287 msg_Warn( p_dec, "Warning from %s: %s",
288 GST_ELEMENT_NAME( GST_MESSAGE_SRC( p_msg ) ),
289 p_error->message );
290 g_error_free( p_error );
291 }
292 break;
293 case GST_MESSAGE_INFO:
294 {
295 gchar *psz_debug;
296 GError *p_error;
297
298 gst_message_parse_info( p_msg, &p_error, &psz_debug );
299 g_free( psz_debug );
300
301 msg_Info( p_dec, "Info from %s: %s",
302 GST_ELEMENT_NAME( GST_MESSAGE_SRC( p_msg ) ),
303 p_error->message );
304 g_error_free( p_error );
305 }
306 break;
307 default:
308 break;
309 }
310
311 return err;
312 }
313
vlc_gst_plugin_init(GstPlugin * p_plugin)314 static gboolean vlc_gst_plugin_init( GstPlugin *p_plugin )
315 {
316 if( !gst_element_register( p_plugin, "vlcvideosink", GST_RANK_NONE,
317 GST_TYPE_VLC_VIDEO_SINK ))
318 return FALSE;
319
320 return TRUE;
321 }
322
323 /* gst_init( ) is not thread-safe, hence a thread-safe wrapper */
vlc_gst_init(void)324 static bool vlc_gst_init( void )
325 {
326 static vlc_mutex_t init_lock = VLC_STATIC_MUTEX;
327 static bool b_registered = false;
328 bool b_ret = true;
329
330 vlc_mutex_lock( &init_lock );
331 gst_init( NULL, NULL );
332 if ( !b_registered )
333 {
334 b_ret = gst_plugin_register_static( 1, 0, "videolan",
335 "VLC Gstreamer plugins", vlc_gst_plugin_init,
336 "1.0.0", "LGPL", "NA", "vlc", "NA" );
337 b_registered = b_ret;
338 }
339 vlc_mutex_unlock( &init_lock );
340
341 return b_ret;
342 }
343
vlc_to_gst_fmt(const es_format_t * p_fmt)344 static GstStructure* vlc_to_gst_fmt( const es_format_t *p_fmt )
345 {
346 const video_format_t *p_vfmt = &p_fmt->video;
347 GstStructure *p_str = NULL;
348
349 switch( p_fmt->i_codec ){
350 case VLC_CODEC_H264:
351 p_str = gst_structure_new_empty( "video/x-h264" );
352 gst_structure_set( p_str, "alignment", G_TYPE_STRING, "au", NULL );
353 if( p_fmt->i_extra )
354 gst_structure_set( p_str, "stream-format", G_TYPE_STRING, "avc",
355 NULL );
356 else
357 gst_structure_set( p_str, "stream-format", G_TYPE_STRING,
358 "byte-stream", NULL );
359 break;
360 case VLC_CODEC_MP4V:
361 p_str = gst_structure_new_empty( "video/mpeg" );
362 gst_structure_set( p_str, "mpegversion", G_TYPE_INT, 4,
363 "systemstream", G_TYPE_BOOLEAN, FALSE, NULL );
364 break;
365 case VLC_CODEC_VP8:
366 p_str = gst_structure_new_empty( "video/x-vp8" );
367 break;
368 case VLC_CODEC_MPGV:
369 p_str = gst_structure_new_empty( "video/mpeg" );
370 gst_structure_set( p_str, "mpegversion", G_TYPE_INT, 2,
371 "systemstream", G_TYPE_BOOLEAN, FALSE, NULL );
372 break;
373 case VLC_CODEC_FLV1:
374 p_str = gst_structure_new_empty( "video/x-flash-video" );
375 gst_structure_set( p_str, "flvversion", G_TYPE_INT, 1, NULL );
376 break;
377 case VLC_CODEC_WMV1:
378 p_str = gst_structure_new_empty( "video/x-wmv" );
379 gst_structure_set( p_str, "wmvversion", G_TYPE_INT, 1,
380 "format", G_TYPE_STRING, "WMV1", NULL );
381 break;
382 case VLC_CODEC_WMV2:
383 p_str = gst_structure_new_empty( "video/x-wmv" );
384 gst_structure_set( p_str, "wmvversion", G_TYPE_INT, 2,
385 "format", G_TYPE_STRING, "WMV2", NULL );
386 break;
387 case VLC_CODEC_WMV3:
388 p_str = gst_structure_new_empty( "video/x-wmv" );
389 gst_structure_set( p_str, "wmvversion", G_TYPE_INT, 3,
390 "format", G_TYPE_STRING, "WMV3", NULL );
391 break;
392 case VLC_CODEC_VC1:
393 p_str = gst_structure_new_empty( "video/x-wmv" );
394 gst_structure_set( p_str, "wmvversion", G_TYPE_INT, 3,
395 "format", G_TYPE_STRING, "WVC1", NULL );
396 break;
397 default:
398 /* unsupported codec */
399 return NULL;
400 }
401
402 if( p_vfmt->i_width && p_vfmt->i_height )
403 gst_structure_set( p_str,
404 "width", G_TYPE_INT, p_vfmt->i_width,
405 "height", G_TYPE_INT, p_vfmt->i_height, NULL );
406
407 if( p_vfmt->i_frame_rate && p_vfmt->i_frame_rate_base )
408 gst_structure_set( p_str, "framerate", GST_TYPE_FRACTION,
409 p_vfmt->i_frame_rate,
410 p_vfmt->i_frame_rate_base, NULL );
411
412 if( p_vfmt->i_sar_num && p_vfmt->i_sar_den )
413 gst_structure_set( p_str, "pixel-aspect-ratio", GST_TYPE_FRACTION,
414 p_vfmt->i_sar_num,
415 p_vfmt->i_sar_den, NULL );
416
417 if( p_fmt->i_extra )
418 {
419 GstBuffer *p_buf;
420
421 p_buf = gst_buffer_new_wrapped_full( GST_MEMORY_FLAG_READONLY,
422 p_fmt->p_extra, p_fmt->i_extra, 0,
423 p_fmt->i_extra, NULL, NULL );
424 if( p_buf == NULL )
425 {
426 gst_structure_free( p_str );
427 return NULL;
428 }
429
430 gst_structure_set( p_str, "codec_data", GST_TYPE_BUFFER, p_buf, NULL );
431 gst_buffer_unref( p_buf );
432 }
433
434 return p_str;
435 }
436
437 /*****************************************************************************
438 * OpenDecoder: probe the decoder and return score
439 *****************************************************************************/
OpenDecoder(vlc_object_t * p_this)440 static int OpenDecoder( vlc_object_t *p_this )
441 {
442 decoder_t *p_dec = ( decoder_t* )p_this;
443 decoder_sys_t *p_sys;
444 GstStateChangeReturn i_ret;
445 gboolean b_ret;
446 sink_src_caps_t caps = { NULL, NULL };
447 GstStructure *p_str;
448 GstAppSrcCallbacks cb;
449 int i_rval = VLC_SUCCESS;
450 GList *p_list;
451 bool dbin;
452
453 #define VLC_GST_CHECK( r, v, s, t ) \
454 { if( r == v ){ msg_Err( p_dec, s ); i_rval = t; goto fail; } }
455
456 if( !vlc_gst_init( ))
457 {
458 msg_Err( p_dec, "failed to register vlcvideosink" );
459 return VLC_EGENERIC;
460 }
461
462 p_str = vlc_to_gst_fmt( &p_dec->fmt_in );
463 if( !p_str )
464 return VLC_EGENERIC;
465
466 /* Allocate the memory needed to store the decoder's structure */
467 p_sys = p_dec->p_sys = calloc( 1, sizeof( *p_sys ) );
468 if( p_sys == NULL )
469 {
470 gst_structure_free( p_str );
471 return VLC_ENOMEM;
472 }
473
474 dbin = var_CreateGetBool( p_dec, "use-decodebin" );
475 msg_Dbg( p_dec, "Using decodebin? %s", dbin ? "yes ":"no" );
476
477 caps.p_sinkcaps = gst_caps_new_empty( );
478 gst_caps_append_structure( caps.p_sinkcaps, p_str );
479 /* Currently supports only system memory raw output format */
480 caps.p_srccaps = gst_caps_new_empty_simple( "video/x-raw" );
481
482 /* Get the list of all the available gstreamer decoders */
483 p_list = gst_element_factory_list_get_elements(
484 GST_ELEMENT_FACTORY_TYPE_DECODER, GST_RANK_MARGINAL );
485 VLC_GST_CHECK( p_list, NULL, "no decoder list found", VLC_ENOMOD );
486 if( !dbin )
487 {
488 GList *p_l;
489 /* Sort them as per ranks */
490 p_list = g_list_sort( p_list, gst_plugin_feature_rank_compare_func );
491 VLC_GST_CHECK( p_list, NULL, "failed to sort decoders list",
492 VLC_ENOMOD );
493 p_l = g_list_find_custom( p_list, &caps, find_decoder_func );
494 VLC_GST_CHECK( p_l, NULL, "no suitable decoder found",
495 VLC_ENOMOD );
496 /* create the decoder with highest rank */
497 p_sys->p_decode_in = gst_element_factory_create(
498 ( GstElementFactory* )p_l->data, NULL );
499 VLC_GST_CHECK( p_sys->p_decode_in, NULL,
500 "failed to create decoder", VLC_ENOMOD );
501 }
502 else
503 {
504 GList *p_l;
505 /* Just check if any suitable decoder exists, rest will be
506 * handled by decodebin */
507 p_l = g_list_find_custom( p_list, &caps, find_decoder_func );
508 VLC_GST_CHECK( p_l, NULL, "no suitable decoder found",
509 VLC_ENOMOD );
510 }
511 gst_plugin_feature_list_free( p_list );
512 p_list = NULL;
513 gst_caps_unref( caps.p_srccaps );
514 caps.p_srccaps = NULL;
515
516 p_sys->b_prerolled = false;
517 p_sys->b_running = false;
518
519 /* Queue: GStreamer thread will dump buffers into this queue,
520 * DecodeBlock() will pop out the buffers from the queue */
521 p_sys->p_que = gst_atomic_queue_new( 0 );
522 VLC_GST_CHECK( p_sys->p_que, NULL, "failed to create queue",
523 VLC_ENOMEM );
524
525 p_sys->p_decode_src = gst_element_factory_make( "appsrc", NULL );
526 VLC_GST_CHECK( p_sys->p_decode_src, NULL, "appsrc not found",
527 VLC_ENOMOD );
528 g_object_set( G_OBJECT( p_sys->p_decode_src ), "caps", caps.p_sinkcaps,
529 "emit-signals", TRUE, "format", GST_FORMAT_BYTES,
530 "stream-type", GST_APP_STREAM_TYPE_SEEKABLE,
531 /* Making DecodeBlock() to block on appsrc with max queue size of 1 byte.
532 * This will make the push_buffer() tightly coupled with the buffer
533 * flow from appsrc -> decoder. push_buffer() will only return when
534 * the same buffer it just fed to appsrc has also been fed to the
535 * decoder element as well */
536 "block", TRUE, "max-bytes", ( guint64 )1, NULL );
537 gst_caps_unref( caps.p_sinkcaps );
538 caps.p_sinkcaps = NULL;
539 cb.enough_data = NULL;
540 cb.need_data = NULL;
541 cb.seek_data = seek_data_cb;
542 gst_app_src_set_callbacks( GST_APP_SRC( p_sys->p_decode_src ),
543 &cb, p_dec, NULL );
544
545 if( dbin )
546 {
547 p_sys->p_decode_in = gst_element_factory_make( "decodebin", NULL );
548 VLC_GST_CHECK( p_sys->p_decode_in, NULL, "decodebin not found",
549 VLC_ENOMOD );
550 //g_object_set( G_OBJECT( p_sys->p_decode_in ),
551 //"max-size-buffers", 2, NULL );
552 //g_signal_connect( G_OBJECT( p_sys->p_decode_in ), "no-more-pads",
553 //G_CALLBACK( no_more_pads_cb ), p_dec );
554 g_signal_connect( G_OBJECT( p_sys->p_decode_in ), "pad-added",
555 G_CALLBACK( pad_added_cb ), p_dec );
556
557 }
558
559 /* videosink: will emit signal for every available buffer */
560 p_sys->p_decode_out = gst_element_factory_make( "vlcvideosink", NULL );
561 VLC_GST_CHECK( p_sys->p_decode_out, NULL, "vlcvideosink not found",
562 VLC_ENOMOD );
563 p_sys->p_allocator = gst_vlc_picture_plane_allocator_new(
564 (gpointer) p_dec );
565 g_object_set( G_OBJECT( p_sys->p_decode_out ), "sync", FALSE, "allocator",
566 p_sys->p_allocator, "id", (gpointer) p_dec, NULL );
567 g_signal_connect( G_OBJECT( p_sys->p_decode_out ), "new-buffer",
568 G_CALLBACK( frame_handoff_cb ), p_dec );
569
570 //FIXME: caps_signal
571 #if 0
572 g_signal_connect( G_OBJECT( p_sys->p_decode_out ), "new-caps",
573 G_CALLBACK( caps_handoff_cb ), p_dec );
574 #else
575 GST_VLC_VIDEO_SINK( p_sys->p_decode_out )->new_caps = caps_handoff_cb;
576 #endif
577
578 p_sys->p_decoder = GST_ELEMENT( gst_bin_new( "decoder" ) );
579 VLC_GST_CHECK( p_sys->p_decoder, NULL, "bin not found", VLC_ENOMOD );
580 p_sys->p_bus = gst_bus_new( );
581 VLC_GST_CHECK( p_sys->p_bus, NULL, "failed to create bus",
582 VLC_ENOMOD );
583 gst_element_set_bus( p_sys->p_decoder, p_sys->p_bus );
584
585 gst_bin_add_many( GST_BIN( p_sys->p_decoder ),
586 p_sys->p_decode_src, p_sys->p_decode_in,
587 p_sys->p_decode_out, NULL );
588 gst_object_ref( p_sys->p_decode_src );
589 gst_object_ref( p_sys->p_decode_in );
590 gst_object_ref( p_sys->p_decode_out );
591
592 b_ret = gst_element_link( p_sys->p_decode_src, p_sys->p_decode_in );
593 VLC_GST_CHECK( b_ret, FALSE, "failed to link src <-> in",
594 VLC_EGENERIC );
595
596 if( !dbin )
597 {
598 b_ret = gst_element_link( p_sys->p_decode_in, p_sys->p_decode_out );
599 VLC_GST_CHECK( b_ret, FALSE, "failed to link in <-> out",
600 VLC_EGENERIC );
601 }
602
603 /* set the pipeline to playing */
604 i_ret = gst_element_set_state( p_sys->p_decoder, GST_STATE_PLAYING );
605 VLC_GST_CHECK( i_ret, GST_STATE_CHANGE_FAILURE,
606 "set state failure", VLC_EGENERIC );
607 p_sys->b_running = true;
608
609 /* Set callbacks */
610 p_dec->pf_decode = DecodeBlock;
611 p_dec->pf_flush = Flush;
612
613 return VLC_SUCCESS;
614
615 fail:
616 if( caps.p_sinkcaps )
617 gst_caps_unref( caps.p_sinkcaps );
618 if( caps.p_srccaps )
619 gst_caps_unref( caps.p_srccaps );
620 if( p_list )
621 gst_plugin_feature_list_free( p_list );
622 CloseDecoder( ( vlc_object_t* )p_dec );
623 return i_rval;
624 }
625
626 /* Flush */
Flush(decoder_t * p_dec)627 static void Flush( decoder_t *p_dec )
628 {
629 decoder_sys_t *p_sys = p_dec->p_sys;
630 GstBuffer *p_buffer;
631 gboolean b_ret;
632
633 /* Send a new segment event. Seeking position is
634 * irrelevant in this case, as the main motive for a
635 * seek here, is to tell the elements to start flushing
636 * and start accepting buffers from a new time segment */
637 b_ret = gst_element_seek_simple( p_sys->p_decoder,
638 GST_FORMAT_BYTES, GST_SEEK_FLAG_FLUSH, 0 );
639 msg_Dbg( p_dec, "new segment event : %d", b_ret );
640
641 /* flush the output buffers from the queue */
642 while( ( p_buffer = gst_atomic_queue_pop( p_sys->p_que ) ) )
643 gst_buffer_unref( p_buffer );
644
645 p_sys->b_prerolled = false;
646 }
647
648 /* Decode */
DecodeBlock(decoder_t * p_dec,block_t * p_block)649 static int DecodeBlock( decoder_t *p_dec, block_t *p_block )
650 {
651 picture_t *p_pic = NULL;
652 decoder_sys_t *p_sys = p_dec->p_sys;
653 GstMessage *p_msg;
654 GstBuffer *p_buf;
655
656 if( !p_block ) /* No Drain */
657 return VLCDEC_SUCCESS;
658
659 if( unlikely( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY |
660 BLOCK_FLAG_CORRUPTED ) ) )
661 {
662 if( p_block->i_flags & BLOCK_FLAG_DISCONTINUITY )
663 Flush( p_dec );
664
665 if( p_block->i_flags & BLOCK_FLAG_CORRUPTED )
666 {
667 block_Release( p_block );
668 goto done;
669 }
670 }
671
672 if( likely( p_block->i_buffer ) )
673 {
674 p_buf = gst_buffer_new_wrapped_full( GST_MEMORY_FLAG_READONLY,
675 p_block->p_start, p_block->i_size,
676 p_block->p_buffer - p_block->p_start, p_block->i_buffer,
677 p_block, ( GDestroyNotify )block_Release );
678 if( unlikely( p_buf == NULL ) )
679 {
680 msg_Err( p_dec, "failed to create input gstbuffer" );
681 block_Release( p_block );
682 return VLCDEC_ECRITICAL;
683 }
684
685 if( p_block->i_dts > VLC_TS_INVALID )
686 GST_BUFFER_DTS( p_buf ) = gst_util_uint64_scale( p_block->i_dts,
687 GST_SECOND, GST_MSECOND );
688
689 if( p_block->i_pts <= VLC_TS_INVALID )
690 GST_BUFFER_PTS( p_buf ) = GST_BUFFER_DTS( p_buf );
691 else
692 GST_BUFFER_PTS( p_buf ) = gst_util_uint64_scale( p_block->i_pts,
693 GST_SECOND, GST_MSECOND );
694
695 if( p_block->i_length > VLC_TS_INVALID )
696 GST_BUFFER_DURATION( p_buf ) = gst_util_uint64_scale(
697 p_block->i_length, GST_SECOND, GST_MSECOND );
698
699 if( p_dec->fmt_in.video.i_frame_rate &&
700 p_dec->fmt_in.video.i_frame_rate_base )
701 GST_BUFFER_DURATION( p_buf ) = gst_util_uint64_scale( GST_SECOND,
702 p_dec->fmt_in.video.i_frame_rate_base,
703 p_dec->fmt_in.video.i_frame_rate );
704
705 /* Give the input buffer to GStreamer Bin.
706 *
707 * libvlc libvlc
708 * \ (i/p) (o/p) ^
709 * \ /
710 * ___v____GSTREAMER BIN_____/____
711 * | |
712 * | appsrc-->decode-->vlcsink |
713 * |_______________________________|
714 *
715 * * * * * * * * * * * * * * * * * * * * */
716 if( unlikely( gst_app_src_push_buffer(
717 GST_APP_SRC_CAST( p_sys->p_decode_src ), p_buf )
718 != GST_FLOW_OK ) )
719 {
720 /* block will be released internally,
721 * when gst_buffer_unref() is called */
722 msg_Err( p_dec, "failed to push buffer" );
723 return VLCDEC_ECRITICAL;
724 }
725 }
726 else
727 block_Release( p_block );
728
729 /* Poll for any messages, errors */
730 p_msg = gst_bus_pop_filtered( p_sys->p_bus,
731 GST_MESSAGE_ASYNC_DONE | GST_MESSAGE_ERROR |
732 GST_MESSAGE_EOS | GST_MESSAGE_WARNING |
733 GST_MESSAGE_INFO );
734 if( p_msg )
735 {
736 switch( GST_MESSAGE_TYPE( p_msg ) ){
737 case GST_MESSAGE_EOS:
738 /* for debugging purpose */
739 msg_Warn( p_dec, "got unexpected eos" );
740 break;
741 /* First buffer received */
742 case GST_MESSAGE_ASYNC_DONE:
743 /* for debugging purpose */
744 p_sys->b_prerolled = true;
745 msg_Dbg( p_dec, "Pipeline is prerolled" );
746 break;
747 default:
748 if( default_msg_handler( p_dec, p_msg ) )
749 {
750 gst_message_unref( p_msg );
751 return VLCDEC_ECRITICAL;
752 }
753 break;
754 }
755 gst_message_unref( p_msg );
756 }
757
758 /* Look for any output buffers in the queue */
759 if( gst_atomic_queue_peek( p_sys->p_que ) )
760 {
761 GstBuffer *p_buf = GST_BUFFER_CAST(
762 gst_atomic_queue_pop( p_sys->p_que ));
763 GstMemory *p_mem;
764
765 if(( p_mem = gst_buffer_peek_memory( p_buf, 0 )) &&
766 GST_IS_VLC_PICTURE_PLANE_ALLOCATOR( p_mem->allocator ))
767 {
768 p_pic = picture_Hold(( (GstVlcPicturePlane*) p_mem )->p_pic );
769 }
770 else
771 {
772 GstVideoFrame frame;
773
774 /* Get a new picture */
775 if( decoder_UpdateVideoFormat( p_dec ) )
776 goto done;
777 p_pic = decoder_NewPicture( p_dec );
778 if( !p_pic )
779 goto done;
780
781 if( unlikely( !gst_video_frame_map( &frame,
782 &p_sys->vinfo, p_buf, GST_MAP_READ ) ) )
783 {
784 msg_Err( p_dec, "failed to map gst video frame" );
785 gst_buffer_unref( p_buf );
786 return VLCDEC_ECRITICAL;
787 }
788
789 gst_CopyPicture( p_pic, &frame );
790 gst_video_frame_unmap( &frame );
791 }
792
793 if( likely( GST_BUFFER_PTS_IS_VALID( p_buf ) ) )
794 p_pic->date = gst_util_uint64_scale(
795 GST_BUFFER_PTS( p_buf ), GST_MSECOND, GST_SECOND );
796 else
797 msg_Warn( p_dec, "Gst Buffer has no timestamp" );
798
799 gst_buffer_unref( p_buf );
800 }
801
802 done:
803 if( p_pic != NULL )
804 decoder_QueueVideo( p_dec, p_pic );
805 return VLCDEC_SUCCESS;
806 }
807
808 /* Close the decoder instance */
CloseDecoder(vlc_object_t * p_this)809 static void CloseDecoder( vlc_object_t *p_this )
810 {
811 decoder_t *p_dec = ( decoder_t* )p_this;
812 decoder_sys_t *p_sys = p_dec->p_sys;
813 gboolean b_running = p_sys->b_running;
814
815 if( b_running )
816 {
817 GstMessage *p_msg;
818 GstFlowReturn i_ret;
819
820 p_sys->b_running = false;
821
822 /* Send EOS to the pipeline */
823 i_ret = gst_app_src_end_of_stream(
824 GST_APP_SRC_CAST( p_sys->p_decode_src ));
825 msg_Dbg( p_dec, "app src eos: %s", gst_flow_get_name( i_ret ) );
826
827 /* and catch it on the bus with a timeout */
828 p_msg = gst_bus_timed_pop_filtered( p_sys->p_bus,
829 2000000000ULL, GST_MESSAGE_EOS | GST_MESSAGE_ERROR );
830
831 if( p_msg )
832 {
833 switch( GST_MESSAGE_TYPE( p_msg ) ){
834 case GST_MESSAGE_EOS:
835 msg_Dbg( p_dec, "got eos" );
836 break;
837 default:
838 if( default_msg_handler( p_dec, p_msg ) )
839 {
840 msg_Err( p_dec, "pipeline may not close gracefully" );
841 return;
842 }
843 break;
844 }
845
846 gst_message_unref( p_msg );
847 }
848 else
849 msg_Warn( p_dec,
850 "no message, pipeline may not close gracefully" );
851 }
852
853 /* Remove any left-over buffers from the queue */
854 if( p_sys->p_que )
855 {
856 GstBuffer *p_buf;
857 while( ( p_buf = gst_atomic_queue_pop( p_sys->p_que ) ) )
858 gst_buffer_unref( p_buf );
859 gst_atomic_queue_unref( p_sys->p_que );
860 }
861
862 if( b_running && gst_element_set_state( p_sys->p_decoder, GST_STATE_NULL )
863 != GST_STATE_CHANGE_SUCCESS )
864 msg_Err( p_dec,
865 "failed to change the state to NULL," \
866 "pipeline may not close gracefully" );
867
868 if( p_sys->p_allocator )
869 gst_object_unref( p_sys->p_allocator );
870 if( p_sys->p_bus )
871 gst_object_unref( p_sys->p_bus );
872 if( p_sys->p_decode_src )
873 gst_object_unref( p_sys->p_decode_src );
874 if( p_sys->p_decode_in )
875 gst_object_unref( p_sys->p_decode_in );
876 if( p_sys->p_decode_out )
877 gst_object_unref( p_sys->p_decode_out );
878 if( p_sys->p_decoder )
879 gst_object_unref( p_sys->p_decoder );
880
881 free( p_sys );
882 }
883