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codec/esout: add support for CEA708
[vlc.git] / modules / packetizer / mpegvideo.c
blob703b1d78e1cd036c3e2d28213036bfa93fe82398
1 /*****************************************************************************
2 * mpegvideo.c: parse and packetize an MPEG1/2 video stream
3 *****************************************************************************
4 * Copyright (C) 2001-2006 VLC authors and VideoLAN
5 * $Id$
6 *
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8 * Eric Petit <titer@videolan.org>
9 * Gildas Bazin <gbazin@videolan.org>
10 * Jean-Paul Saman <jpsaman #_at_# m2x dot nl>
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU Lesser General Public License as published by
14 * the Free Software Foundation; either version 2.1 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Lesser General Public License for more details.
21 *
22 * You should have received a copy of the GNU Lesser General Public License
23 * along with this program; if not, write to the Free Software Foundation,
24 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25 *****************************************************************************/
26
27 /*****************************************************************************
28 * Problem with this implementation:
29 *
30 * Although we should time-stamp each picture with a PTS, this isn't possible
31 * with the current implementation.
32 * The problem comes from the fact that for non-low-delay streams we can't
33 * calculate the PTS of pictures used as backward reference. Even the temporal
34 * reference number doesn't help here because all the pictures don't
35 * necessarily have the same duration (eg. 3:2 pulldown).
36 *
37 * However this doesn't really matter as far as the MPEG muxers are concerned
38 * because they allow having empty PTS fields. --gibalou
39 *****************************************************************************/
40
41 /*****************************************************************************
42 * Preamble
43 *****************************************************************************/
44
45 #ifdef HAVE_CONFIG_H
46 # include "config.h"
47 #endif
48
49 #include <vlc_common.h>
50 #include <vlc_plugin.h>
51 #include <vlc_block.h>
52 #include <vlc_codec.h>
53 #include <vlc_block_helper.h>
54 #include "../codec/cc.h"
55 #include "packetizer_helper.h"
56 #include "startcode_helper.h"
57
58 #include <limits.h>
59
60 #define SYNC_INTRAFRAME_TEXT N_("Sync on Intra Frame")
61 #define SYNC_INTRAFRAME_LONGTEXT N_("Normally the packetizer would " \
62 "sync on the next full frame. This flags instructs the packetizer " \
63 "to sync on the first Intra Frame found.")
64
65 /*****************************************************************************
66 * Module descriptor
67 *****************************************************************************/
68 static int Open ( vlc_object_t * );
69 static void Close( vlc_object_t * );
70
71 vlc_module_begin ()
72 set_category( CAT_SOUT )
73 set_subcategory( SUBCAT_SOUT_PACKETIZER )
74 set_description( N_("MPEG-I/II video packetizer") )
75 set_shortname( N_("MPEG Video") )
76 set_capability( "packetizer", 50 )
77 set_callbacks( Open, Close )
78
79 add_bool( "packetizer-mpegvideo-sync-iframe", false, SYNC_INTRAFRAME_TEXT,
80 SYNC_INTRAFRAME_LONGTEXT, true )
81 vlc_module_end ()
82
83 enum mpeg_startcode_e
84 {
85 PICTURE_STARTCODE = 0x00,
86 SLICE_STARTCODE_FIRST = 0x01,
87 SLICE_STARTCODE_LAST = 0xAF,
88 USER_DATA_STARTCODE = 0xB2,
89 SEQUENCE_HEADER_STARTCODE = 0xB3,
90 SEQUENCE_ERROR_STARTCODE = 0xB4,
91 EXTENSION_STARTCODE = 0xB5,
92 SEQUENCE_END_STARTCODE = 0xB7,
93 GROUP_STARTCODE = 0xB8,
94 SYSTEM_STARTCODE_FIRST = 0xB9,
95 SYSTEM_STARTCODE_LAST = 0xFF,
96 };
97
98 enum extension_start_code_identifier_e
99 {
100 SEQUENCE_EXTENSION_ID = 0x01,
101 SEQUENCE_DISPLAY_EXTENSION_ID = 0x02,
102 QUANT_MATRIX_EXTENSION_ID = 0x03,
103 COPYRIGHT_EXTENSION_ID = 0x04,
104 SEQUENCE_SCALABLE_EXTENSION_ID = 0x05,
105 PICTURE_DISPLAY_EXTENSION_ID = 0x07,
106 PICTURE_CODING_EXTENSION_ID = 0x08,
107 PICTURE_SPATIAL_SCALABLE_EXTENSION_ID = 0x09,
108 PICTURE_TEMPORAL_SCALABLE_EXTENSION_ID = 0x0A,
109 CAMERA_PARAMETERS_EXTENSION_ID = 0x0B,
110 ITU_T_EXTENSION_ID = 0x0C,
111 };
112
113 /*****************************************************************************
114 * Local prototypes
115 *****************************************************************************/
116 struct decoder_sys_t
117 {
118 /*
119 * Input properties
120 */
121 packetizer_t packetizer;
122
123 /* Sequence header and extension */
124 block_t *p_seq;
125 block_t *p_ext;
126
127 /* Current frame being built */
128 block_t *p_frame;
129 block_t **pp_last;
130
131 bool b_frame_slice;
132 mtime_t i_pts;
133 mtime_t i_dts;
134
135 date_t dts;
136 date_t prev_iframe_dts;
137
138 /* Sequence properties */
139 unsigned i_frame_rate;
140 unsigned i_frame_rate_base;
141 bool b_seq_progressive;
142 bool b_low_delay;
143 int i_aspect_ratio_info;
144 bool b_inited;
145
146 /* Picture properties */
147 int i_temporal_ref;
148 int i_prev_temporal_ref;
149 int i_picture_type;
150 int i_picture_structure;
151 int i_top_field_first;
152 int i_repeat_first_field;
153 int i_progressive_frame;
154
155 mtime_t i_last_ref_pts;
156
157 mtime_t i_last_frame_pts;
158 uint16_t i_last_frame_refid;
159
160 bool b_second_field;
161
162 /* Number of pictures since last sequence header */
163 unsigned i_seq_old;
164
165 /* Sync behaviour */
166 bool b_sync_on_intra_frame;
167 bool b_waiting_iframe;
168 int i_next_block_flags;
169
170 /* */
171 bool b_cc_reset;
172 uint32_t i_cc_flags;
173 mtime_t i_cc_pts;
174 mtime_t i_cc_dts;
175 cc_data_t cc;
176 };
177
178 static block_t *Packetize( decoder_t *, block_t ** );
179 static void PacketizeFlush( decoder_t * );
180 static block_t *GetCc( decoder_t *p_dec, decoder_cc_desc_t * );
181
182 static void PacketizeReset( void *p_private, bool b_broken );
183 static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t * );
184 static int PacketizeValidate( void *p_private, block_t * );
185
186 static block_t *ParseMPEGBlock( decoder_t *, block_t * );
187
188 static const uint8_t p_mp2v_startcode[3] = { 0x00, 0x00, 0x01 };
189
190 /*****************************************************************************
191 * Open:
192 *****************************************************************************/
193 static int Open( vlc_object_t *p_this )
194 {
195 decoder_t *p_dec = (decoder_t*)p_this;
196 decoder_sys_t *p_sys;
197
198 if( p_dec->fmt_in.i_codec != VLC_CODEC_MPGV )
199 return VLC_EGENERIC;
200
201 p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
202 if( !p_dec->p_sys )
203 return VLC_ENOMEM;
204 memset( p_dec->p_sys, 0, sizeof( decoder_sys_t ) );
205
206 p_dec->fmt_out.i_codec = VLC_CODEC_MPGV;
207 p_dec->fmt_out.i_original_fourcc = p_dec->fmt_in.i_original_fourcc;
208
209 /* Misc init */
210 packetizer_Init( &p_sys->packetizer,
211 p_mp2v_startcode, sizeof(p_mp2v_startcode), startcode_FindAnnexB,
212 NULL, 0, 4,
213 PacketizeReset, PacketizeParse, PacketizeValidate, p_dec );
214
215 p_sys->p_seq = NULL;
216 p_sys->p_ext = NULL;
217 p_sys->p_frame = NULL;
218 p_sys->pp_last = &p_sys->p_frame;
219 p_sys->b_frame_slice = false;
220
221 p_sys->i_dts =
222 p_sys->i_pts = VLC_TS_INVALID;
223 date_Init( &p_sys->dts, 30000, 1001 );
224 date_Set( &p_sys->dts, VLC_TS_INVALID );
225 date_Init( &p_sys->prev_iframe_dts, 30000, 1001 );
226 date_Set( &p_sys->prev_iframe_dts, VLC_TS_INVALID );
227
228 p_sys->i_frame_rate = 2 * 30000;
229 p_sys->i_frame_rate_base = 1001;
230 p_sys->b_seq_progressive = true;
231 p_sys->b_low_delay = true;
232 p_sys->i_seq_old = 0;
233
234 p_sys->i_temporal_ref = 0;
235 p_sys->i_prev_temporal_ref = 2048;
236 p_sys->i_picture_type = 0;
237 p_sys->i_picture_structure = 0x03; /* frame */
238 p_sys->i_top_field_first = 0;
239 p_sys->i_repeat_first_field = 0;
240 p_sys->i_progressive_frame = 0;
241 p_sys->b_inited = 0;
242
243 p_sys->i_last_ref_pts = VLC_TS_INVALID;
244 p_sys->b_second_field = 0;
245
246 p_sys->i_next_block_flags = 0;
247
248 p_sys->i_last_frame_refid = 0;
249
250 p_sys->b_waiting_iframe =
251 p_sys->b_sync_on_intra_frame = var_CreateGetBool( p_dec, "packetizer-mpegvideo-sync-iframe" );
252 if( p_sys->b_sync_on_intra_frame )
253 msg_Dbg( p_dec, "syncing on intra frame now" );
254
255 p_sys->b_cc_reset = false;
256 p_sys->i_cc_pts = 0;
257 p_sys->i_cc_dts = 0;
258 p_sys->i_cc_flags = 0;
259 cc_Init( &p_sys->cc );
260
261 p_dec->pf_packetize = Packetize;
262 p_dec->pf_flush = PacketizeFlush;
263 p_dec->pf_get_cc = GetCc;
264
265 return VLC_SUCCESS;
266 }
267
268 /*****************************************************************************
269 * Close:
270 *****************************************************************************/
271 static void Close( vlc_object_t *p_this )
272 {
273 decoder_t *p_dec = (decoder_t*)p_this;
274 decoder_sys_t *p_sys = p_dec->p_sys;
275
276 if( p_sys->p_seq )
277 {
278 block_Release( p_sys->p_seq );
279 }
280 if( p_sys->p_ext )
281 {
282 block_Release( p_sys->p_ext );
283 }
284 if( p_sys->p_frame )
285 {
286 block_ChainRelease( p_sys->p_frame );
287 }
288 packetizer_Clean( &p_sys->packetizer );
289
290 var_Destroy( p_dec, "packetizer-mpegvideo-sync-iframe" );
291
292 free( p_sys );
293 }
294
295 /*****************************************************************************
296 * Packetize:
297 *****************************************************************************/
298 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
299 {
300 decoder_sys_t *p_sys = p_dec->p_sys;
301
302 return packetizer_Packetize( &p_sys->packetizer, pp_block );
303 }
304
305 static void PacketizeFlush( decoder_t *p_dec )
306 {
307 decoder_sys_t *p_sys = p_dec->p_sys;
308
309 packetizer_Flush( &p_sys->packetizer );
310 }
311
312 /*****************************************************************************
313 * GetCc:
314 *****************************************************************************/
315 static block_t *GetCc( decoder_t *p_dec, decoder_cc_desc_t *p_desc )
316 {
317 decoder_sys_t *p_sys = p_dec->p_sys;
318 block_t *p_cc;
319
320 if( !p_sys->cc.b_reorder && p_sys->cc.i_data <= 0 )
321 return NULL;
322
323 p_cc = block_Alloc( p_sys->cc.i_data );
324 if( p_cc )
325 {
326 memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
327 p_cc->i_dts =
328 p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
329 p_cc->i_flags = p_sys->i_cc_flags & BLOCK_FLAG_TYPE_MASK;
330
331 p_desc->i_608_channels = p_sys->cc.i_608channels;
332 p_desc->i_708_channels = p_sys->cc.i_708channels;
333 p_desc->i_reorder_depth = p_sys->cc.b_reorder ? 0 : -1;
334 }
335 cc_Flush( &p_sys->cc );
336 return p_cc;
337 }
338
339 /*****************************************************************************
340 * Helpers:
341 *****************************************************************************/
342 static void PacketizeReset( void *p_private, bool b_broken )
343 {
344 VLC_UNUSED(b_broken);
345 decoder_t *p_dec = p_private;
346 decoder_sys_t *p_sys = p_dec->p_sys;
347
348 p_sys->i_next_block_flags = BLOCK_FLAG_DISCONTINUITY;
349 if( p_sys->p_frame )
350 {
351 block_ChainRelease( p_sys->p_frame );
352 p_sys->p_frame = NULL;
353 p_sys->pp_last = &p_sys->p_frame;
354 p_sys->b_frame_slice = false;
355 }
356 date_Set( &p_sys->dts, VLC_TS_INVALID );
357 date_Set( &p_sys->prev_iframe_dts, VLC_TS_INVALID );
358 p_sys->i_dts =
359 p_sys->i_pts =
360 p_sys->i_last_ref_pts = VLC_TS_INVALID;
361 p_sys->b_waiting_iframe = p_sys->b_sync_on_intra_frame;
362 p_sys->i_prev_temporal_ref = 2048;
363 }
364
365 static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t *p_block )
366 {
367 decoder_t *p_dec = p_private;
368 decoder_sys_t *p_sys = p_dec->p_sys;
369
370 /* Check if we have a picture start code */
371 *pb_ts_used = p_block->p_buffer[3] == PICTURE_STARTCODE;
372
373 p_block = ParseMPEGBlock( p_dec, p_block );
374 if( p_block )
375 {
376 p_block->i_flags |= p_sys->i_next_block_flags;
377 p_sys->i_next_block_flags = 0;
378 }
379 return p_block;
380 }
381
382
383 static int PacketizeValidate( void *p_private, block_t *p_au )
384 {
385 decoder_t *p_dec = p_private;
386 decoder_sys_t *p_sys = p_dec->p_sys;
387
388 if( unlikely( p_sys->b_waiting_iframe ) )
389 {
390 if( (p_au->i_flags & BLOCK_FLAG_TYPE_I) == 0 )
391 {
392 msg_Dbg( p_dec, "waiting on intra frame" );
393 return VLC_EGENERIC;
394 }
395 msg_Dbg( p_dec, "synced on intra frame" );
396 p_sys->b_waiting_iframe = false;
397 }
398
399 /* We've just started the stream, wait for the first PTS.
400 * We discard here so we can still get the sequence header. */
401 if( unlikely( p_sys->i_dts <= VLC_TS_INVALID && p_sys->i_pts <= VLC_TS_INVALID &&
402 date_Get( &p_sys->dts ) <= VLC_TS_INVALID ))
403 {
404 msg_Dbg( p_dec, "need a starting pts/dts" );
405 return VLC_EGENERIC;
406 }
407
408 /* When starting the stream we can have the first frame with
409 * an invalid DTS (i_interpolated_pts is initialized to VLC_TS_INVALID) */
410 if( unlikely( p_au->i_dts <= VLC_TS_INVALID ) )
411 p_au->i_dts = p_au->i_pts;
412
413 return VLC_SUCCESS;
414 }
415 /*****************************************************************************
416 * ParseMPEGBlock: Re-assemble fragments into a block containing a picture
417 *****************************************************************************/
418 static block_t *ParseMPEGBlock( decoder_t *p_dec, block_t *p_frag )
419 {
420 decoder_sys_t *p_sys = p_dec->p_sys;
421 block_t *p_pic = NULL;
422
423 const enum mpeg_startcode_e startcode = p_frag->p_buffer[3];
424 /*
425 * Check if previous picture is finished
426 */
427 if( ( p_sys->b_frame_slice &&
428 (startcode == PICTURE_STARTCODE || startcode > SLICE_STARTCODE_LAST ) ) &&
429 p_sys->p_seq == NULL )
430 {
431 /* We have a picture but without a sequence header we can't
432 * do anything */
433 msg_Dbg( p_dec, "waiting for sequence start" );
434 if( p_sys->p_frame ) block_ChainRelease( p_sys->p_frame );
435 p_sys->p_frame = NULL;
436 p_sys->pp_last = &p_sys->p_frame;
437 p_sys->b_frame_slice = false;
438
439 }
440 else if( p_sys->b_frame_slice &&
441 (startcode == PICTURE_STARTCODE ||
442 (startcode > SLICE_STARTCODE_LAST && startcode != EXTENSION_STARTCODE )) )
443 {
444 const bool b_eos = startcode == SEQUENCE_END_STARTCODE;
445
446 if( b_eos )
447 {
448 block_ChainLastAppend( &p_sys->pp_last, p_frag );
449 p_frag = NULL;
450 }
451
452 p_pic = block_ChainGather( p_sys->p_frame );
453 if( p_pic == NULL )
454 return p_pic;
455
456 if( b_eos )
457 p_pic->i_flags |= BLOCK_FLAG_END_OF_SEQUENCE;
458
459 unsigned i_num_fields;
460
461 if( !p_sys->b_seq_progressive && p_sys->i_picture_structure != 0x03 /* Field Picture */ )
462 i_num_fields = 1;
463 else
464 i_num_fields = 2;
465
466 if( p_sys->b_seq_progressive )
467 {
468 if( p_sys->i_top_field_first == 0 &&
469 p_sys->i_repeat_first_field == 1 )
470 {
471 i_num_fields *= 2;
472 }
473 else if( p_sys->i_top_field_first == 1 &&
474 p_sys->i_repeat_first_field == 1 )
475 {
476 i_num_fields *= 3;
477 }
478 }
479 else
480 {
481 if( p_sys->i_picture_structure == 0x03 /* Frame Picture */ )
482 {
483 if( p_sys->i_progressive_frame && p_sys->i_repeat_first_field )
484 {
485 i_num_fields += 1;
486 }
487 }
488 }
489
490 switch ( p_sys->i_picture_type )
491 {
492 case 0x01:
493 p_pic->i_flags |= BLOCK_FLAG_TYPE_I;
494 break;
495 case 0x02:
496 p_pic->i_flags |= BLOCK_FLAG_TYPE_P;
497 break;
498 case 0x03:
499 p_pic->i_flags |= BLOCK_FLAG_TYPE_B;
500 break;
501 }
502
503 if( !p_sys->b_seq_progressive )
504 {
505 if( p_sys->i_picture_structure < 0x03 )
506 {
507 p_pic->i_flags |= BLOCK_FLAG_SINGLE_FIELD;
508 p_pic->i_flags |= (p_sys->i_picture_structure == 0x01) ? BLOCK_FLAG_TOP_FIELD_FIRST
509 : BLOCK_FLAG_BOTTOM_FIELD_FIRST;
510 }
511 else /* if( p_sys->i_picture_structure == 0x03 ) */
512 {
513 p_pic->i_flags |= (p_sys->i_top_field_first) ? BLOCK_FLAG_TOP_FIELD_FIRST
514 : BLOCK_FLAG_BOTTOM_FIELD_FIRST;
515 }
516 }
517
518 /* Special case for DVR-MS where we need to fully build pts from scratch
519 * and only use first dts as it does not monotonically increase
520 * This will NOT work with frame repeats and such, as we would need to fully
521 * fill the DPB to get accurate pts timings. */
522 if( unlikely( p_dec->fmt_in.i_original_fourcc == VLC_FOURCC( 'D','V','R',' ') ) )
523 {
524 const bool b_first_xmited = (p_sys->i_prev_temporal_ref != p_sys->i_temporal_ref );
525
526 if( ( p_pic->i_flags & BLOCK_FLAG_TYPE_I ) && b_first_xmited )
527 {
528 if( date_Get( &p_sys->prev_iframe_dts ) == VLC_TS_INVALID )
529 {
530 if( p_sys->i_dts != VLC_TS_INVALID )
531 {
532 date_Set( &p_sys->dts, p_sys->i_dts );
533 }
534 else
535 {
536 if( date_Get( &p_sys->dts ) == VLC_TS_INVALID )
537 {
538 date_Set( &p_sys->dts, VLC_TS_0 );
539 }
540 }
541 }
542 p_sys->prev_iframe_dts = p_sys->dts;
543 }
544
545 p_pic->i_dts = date_Get( &p_sys->dts );
546
547 /* Compute pts from poc */
548 date_t datepts = p_sys->prev_iframe_dts;
549 date_Increment( &datepts, (1 + p_sys->i_temporal_ref) * 2 );
550
551 /* Field picture second field case */
552 if( p_sys->i_picture_structure != 0x03 )
553 {
554 /* first sent is not the first in display order */
555 if( (p_sys->i_picture_structure >> 1) != !p_sys->i_top_field_first &&
556 b_first_xmited )
557 {
558 date_Increment( &datepts, 2 );
559 }
560 }
561
562 p_pic->i_pts = date_Get( &datepts );
563
564 if( date_Get( &p_sys->dts ) != VLC_TS_INVALID )
565 {
566 date_Increment( &p_sys->dts, i_num_fields );
567
568 p_pic->i_length = date_Get( &p_sys->dts ) - p_pic->i_dts;
569 }
570 p_sys->i_prev_temporal_ref = p_sys->i_temporal_ref;
571 }
572 else /* General case, use demuxer's dts/pts when set or interpolate */
573 {
574 if( p_sys->b_low_delay || p_sys->i_picture_type == 0x03 )
575 {
576 /* Trivial case (DTS == PTS) */
577 /* Correct interpolated dts when we receive a new pts/dts */
578 if( p_sys->i_pts > VLC_TS_INVALID )
579 date_Set( &p_sys->dts, p_sys->i_pts );
580 if( p_sys->i_dts > VLC_TS_INVALID )
581 date_Set( &p_sys->dts, p_sys->i_dts );
582 }
583 else
584 {
585 /* Correct interpolated dts when we receive a new pts/dts */
586 if(p_sys->i_last_ref_pts > VLC_TS_INVALID && !p_sys->b_second_field)
587 date_Set( &p_sys->dts, p_sys->i_last_ref_pts );
588 if( p_sys->i_dts > VLC_TS_INVALID )
589 date_Set( &p_sys->dts, p_sys->i_dts );
590
591 if( !p_sys->b_second_field )
592 p_sys->i_last_ref_pts = p_sys->i_pts;
593 }
594
595 p_pic->i_dts = date_Get( &p_sys->dts );
596
597 /* Set PTS only if we have a B frame or if it comes from the stream */
598 if( p_sys->i_pts > VLC_TS_INVALID )
599 {
600 p_pic->i_pts = p_sys->i_pts;
601 }
602 else if( p_sys->i_picture_type == 0x03 )
603 {
604 p_pic->i_pts = p_pic->i_dts;
605 }
606 else
607 {
608 p_pic->i_pts = VLC_TS_INVALID;
609 }
610
611 if( date_Get( &p_sys->dts ) != VLC_TS_INVALID )
612 {
613 date_Increment( &p_sys->dts, i_num_fields );
614
615 p_pic->i_length = date_Get( &p_sys->dts ) - p_pic->i_dts;
616 }
617 }
618
619 #if 0
620 msg_Dbg( p_dec, "pic: type=%d ref=%d nf=%d tff=%d dts=%"PRId64" ptsdiff=%"PRId64" len=%"PRId64,
621 p_sys->i_picture_structure, p_sys->i_temporal_ref, i_num_fields,
622 p_sys->i_top_field_first,
623 p_pic->i_dts , (p_pic->i_pts > VLC_TS_INVALID) ? p_pic->i_pts - p_pic->i_dts : 0, p_pic->i_length );
624 #endif
625
626
627 /* Reset context */
628 p_sys->p_frame = NULL;
629 p_sys->pp_last = &p_sys->p_frame;
630 p_sys->b_frame_slice = false;
631
632 if( p_sys->i_picture_structure != 0x03 )
633 {
634 p_sys->b_second_field = !p_sys->b_second_field;
635 }
636 else
637 {
638 p_sys->b_second_field = 0;
639 }
640
641 /* CC */
642 p_sys->b_cc_reset = true;
643 p_sys->i_cc_pts = p_pic->i_pts;
644 p_sys->i_cc_dts = p_pic->i_dts;
645 p_sys->i_cc_flags = p_pic->i_flags & BLOCK_FLAG_TYPE_MASK;
646 }
647
648 if( !p_pic && p_sys->b_cc_reset )
649 {
650 p_sys->b_cc_reset = false;
651 cc_Flush( &p_sys->cc );
652 }
653
654 if( !p_frag )
655 return p_pic;
656 /*
657 * Check info of current fragment
658 */
659 if( startcode == GROUP_STARTCODE )
660 {
661 /* Group start code */
662 if( p_sys->p_seq &&
663 p_sys->i_seq_old > p_sys->i_frame_rate/p_sys->i_frame_rate_base )
664 {
665 /* Useful for mpeg1: repeat sequence header every second */
666 block_ChainLastAppend( &p_sys->pp_last, block_Duplicate( p_sys->p_seq ) );
667 if( p_sys->p_ext )
668 {
669 block_ChainLastAppend( &p_sys->pp_last, block_Duplicate( p_sys->p_ext ) );
670 }
671
672 p_sys->i_seq_old = 0;
673 }
674 }
675 else if( startcode == SEQUENCE_HEADER_STARTCODE && p_frag->i_buffer >= 8 )
676 {
677 /* Sequence header code */
678 static const int code_to_frame_rate[16][2] =
679 {
680 { 1, 1 }, /* invalid */
681 { 24000, 1001 }, { 24, 1 }, { 25, 1 }, { 30000, 1001 },
682 { 30, 1 }, { 50, 1 }, { 60000, 1001 }, { 60, 1 },
683 /* Unofficial 15fps from Xing*/
684 { 15, 1001 },
685 /* Unofficial economy rates from libmpeg3 */
686 { 5000, 1001 }, { 1000, 1001 }, { 12000, 1001 }, { 15000, 1001 },
687 { 1, 1 }, { 1, 1 } /* invalid */
688 };
689
690 if( p_sys->p_seq ) block_Release( p_sys->p_seq );
691 if( p_sys->p_ext ) block_Release( p_sys->p_ext );
692
693 p_sys->p_seq = block_Duplicate( p_frag );
694 p_sys->i_seq_old = 0;
695 p_sys->p_ext = NULL;
696
697 p_dec->fmt_out.video.i_visible_width =
698 ( p_frag->p_buffer[4] << 4)|(p_frag->p_buffer[5] >> 4 );
699 p_dec->fmt_out.video.i_width = (p_dec->fmt_out.video.i_visible_width + 0x0F) & ~0x0F;
700 p_dec->fmt_out.video.i_visible_height =
701 ( (p_frag->p_buffer[5]&0x0f) << 8 )|p_frag->p_buffer[6];
702 if( p_sys->b_seq_progressive )
703 p_dec->fmt_out.video.i_height = (p_dec->fmt_out.video.i_visible_height + 0x0F) & ~0x0F;
704 else
705 p_dec->fmt_out.video.i_height = (p_dec->fmt_out.video.i_visible_height + 0x1F) & ~0x1F;
706 p_sys->i_aspect_ratio_info = p_frag->p_buffer[7] >> 4;
707
708 /* TODO: MPEG1 aspect ratio */
709
710 p_sys->i_frame_rate = code_to_frame_rate[p_frag->p_buffer[7]&0x0f][0];
711 p_sys->i_frame_rate_base =
712 code_to_frame_rate[p_frag->p_buffer[7]&0x0f][1];
713
714 if( ( p_sys->i_frame_rate != p_dec->fmt_out.video.i_frame_rate ||
715 p_dec->fmt_out.video.i_frame_rate_base != p_sys->i_frame_rate_base ) &&
716 p_sys->i_frame_rate && p_sys->i_frame_rate_base && p_sys->i_frame_rate <= UINT_MAX/2 )
717 {
718 date_Change( &p_sys->dts, 2 * p_sys->i_frame_rate, p_sys->i_frame_rate_base );
719 date_Change( &p_sys->prev_iframe_dts, 2 * p_sys->i_frame_rate, p_sys->i_frame_rate_base );
720 }
721 p_dec->fmt_out.video.i_frame_rate = p_sys->i_frame_rate;
722 p_dec->fmt_out.video.i_frame_rate_base = p_sys->i_frame_rate_base;
723
724 p_sys->b_seq_progressive = true;
725 p_sys->b_low_delay = true;
726
727
728 if ( !p_sys->b_inited )
729 {
730 msg_Dbg( p_dec, "size %dx%d/%dx%d fps=%.3f",
731 p_dec->fmt_out.video.i_visible_width, p_dec->fmt_out.video.i_visible_height,
732 p_dec->fmt_out.video.i_width, p_dec->fmt_out.video.i_height,
733 p_sys->i_frame_rate / (float)(p_sys->i_frame_rate_base ? p_sys->i_frame_rate_base : 1) );
734 p_sys->b_inited = 1;
735 }
736 }
737 else if( startcode == EXTENSION_STARTCODE && p_frag->i_buffer > 4 )
738 {
739 /* extension_start_code_identifier */
740 const enum extension_start_code_identifier_e extid = p_frag->p_buffer[4] >> 4;
741
742 /* Extension start code */
743 if( extid == SEQUENCE_EXTENSION_ID )
744 {
745 #if 0
746 static const int mpeg2_aspect[16][2] =
747 {
748 {0,1}, {1,1}, {4,3}, {16,9}, {221,100},
749 {0,1}, {0,1}, {0,1}, {0,1}, {0,1}, {0,1}, {0,1}, {0,1}, {0,1},
750 {0,1}, {0,1}
751 };
752 #endif
753
754 /* sequence extension */
755 if( p_sys->p_ext) block_Release( p_sys->p_ext );
756 p_sys->p_ext = block_Duplicate( p_frag );
757
758 if( p_frag->i_buffer >= 10 )
759 {
760 p_sys->b_seq_progressive =
761 p_frag->p_buffer[5]&0x08 ? true : false;
762 p_sys->b_low_delay =
763 p_frag->p_buffer[9]&0x80 ? true : false;
764 }
765
766 /* Do not set aspect ratio : in case we're transcoding,
767 * transcode will take our fmt_out as a fmt_in to libmpeg2.
768 * libmpeg2.c will then believe that the user has requested
769 * a specific aspect ratio, which she hasn't. Thus in case
770 * of aspect ratio change, we're screwed. --Meuuh
771 */
772 #if 0
773 p_dec->fmt_out.video.i_sar_num =
774 mpeg2_aspect[p_sys->i_aspect_ratio_info][0] *
775 p_dec->fmt_out.video.i_height;
776 p_dec->fmt_out.video.i_sar_den =
777 mpeg2_aspect[p_sys->i_aspect_ratio_info][1] *
778 p_dec->fmt_out.video.i_width;
779 #endif
780
781 }
782 else if( extid == PICTURE_CODING_EXTENSION_ID && p_frag->i_buffer > 8 )
783 {
784 /* picture extension */
785 p_sys->i_picture_structure = p_frag->p_buffer[6]&0x03;
786 p_sys->i_top_field_first = p_frag->p_buffer[7] >> 7;
787 p_sys->i_repeat_first_field= (p_frag->p_buffer[7]>>1)&0x01;
788 p_sys->i_progressive_frame = p_frag->p_buffer[8] >> 7;
789 }
790 else if( extid == SEQUENCE_DISPLAY_EXTENSION_ID && p_frag->i_buffer > 8 )
791 {
792 /* Sequence display extension */
793 bool contains_color_description = (p_frag->p_buffer[4] & 0x01);
794 //uint8_t video_format = (p_frag->p_buffer[4] & 0x0f) >> 1;
795
796 if( contains_color_description && p_frag->i_buffer > 11 )
797 {
798 uint8_t color_primaries = p_frag->p_buffer[5];
799 uint8_t color_transfer = p_frag->p_buffer[6];
800 uint8_t color_matrix = p_frag->p_buffer[7];
801 switch( color_primaries )
802 {
803 case 1:
804 p_dec->fmt_out.video.primaries = COLOR_PRIMARIES_BT709;
805 break;
806 case 4: /* BT.470M */
807 case 5: /* BT.470BG */
808 p_dec->fmt_out.video.primaries = COLOR_PRIMARIES_BT601_625;
809 break;
810 case 6: /* SMPTE 170M */
811 case 7: /* SMPTE 240M */
812 p_dec->fmt_out.video.primaries = COLOR_PRIMARIES_BT601_525;
813 break;
814 default:
815 break;
816 }
817 switch( color_transfer )
818 {
819 case 1:
820 p_dec->fmt_out.video.transfer = TRANSFER_FUNC_BT709;
821 break;
822 case 4: /* BT.470M assumed gamma 2.2 */
823 p_dec->fmt_out.video.transfer = TRANSFER_FUNC_SRGB;
824 break;
825 case 5: /* BT.470BG */
826 case 6: /* SMPTE 170M */
827 p_dec->fmt_out.video.transfer = TRANSFER_FUNC_BT2020;
828 break;
829 case 8: /* Linear */
830 p_dec->fmt_out.video.transfer = TRANSFER_FUNC_LINEAR;
831 break;
832 default:
833 break;
834 }
835 switch( color_matrix )
836 {
837 case 1:
838 p_dec->fmt_out.video.space = COLOR_SPACE_BT709;
839 break;
840 case 5: /* BT.470BG */
841 case 6: /* SMPTE 170 M */
842 case 7: /* SMPTE 240 M */
843 p_dec->fmt_out.video.space = COLOR_SPACE_BT601;
844 break;
845 default:
846 break;
847 }
848 }
849
850 }
851 }
852 else if( startcode == USER_DATA_STARTCODE && p_frag->i_buffer > 8 )
853 {
854 /* Frame Packing extension identifier as H262 2012 Amd4 Annex L */
855 if( !memcmp( &p_frag->p_buffer[4], "JP3D", 4 ) &&
856 p_frag->i_buffer > 11 && p_frag->p_buffer[8] == 0x03 &&
857 p_dec->fmt_in.video.multiview_mode == MULTIVIEW_2D )
858 {
859 video_multiview_mode_t mode;
860 switch( p_frag->p_buffer[9] & 0x7F )
861 {
862 case 0x03:
863 mode = MULTIVIEW_STEREO_SBS; break;
864 case 0x04:
865 mode = MULTIVIEW_STEREO_TB; break;
866 case 0x08:
867 default:
868 mode = MULTIVIEW_2D; break;
869 }
870 p_dec->fmt_out.video.multiview_mode = mode;
871 }
872 else
873 cc_ProbeAndExtract( &p_sys->cc, p_sys->i_top_field_first,
874 &p_frag->p_buffer[4], p_frag->i_buffer - 4 );
875 }
876 else if( startcode == PICTURE_STARTCODE )
877 {
878 /* Picture start code */
879 p_sys->i_seq_old++;
880
881 if( p_frag->i_buffer >= 6 )
882 {
883 p_sys->i_temporal_ref =
884 ( p_frag->p_buffer[4] << 2 )|(p_frag->p_buffer[5] >> 6);
885 p_sys->i_picture_type = ( p_frag->p_buffer[5] >> 3 ) & 0x03;
886 }
887
888 p_sys->i_dts = p_frag->i_dts;
889 p_sys->i_pts = p_frag->i_pts;
890 }
891 else if( startcode >= SLICE_STARTCODE_FIRST &&
892 startcode <= SLICE_STARTCODE_LAST )
893 {
894 /* Slice start code */
895 p_sys->b_frame_slice = true;
896 }
897
898 /* Append the block */
899 block_ChainLastAppend( &p_sys->pp_last, p_frag );
900
901 return p_pic;
902 }
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