1 /*****************************************************************************
2 * h264.c: h264/avc video packetizer
3 *****************************************************************************
4 * Copyright (C) 2001, 2002, 2006 the VideoLAN team
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8 * Eric Petit <titer@videolan.org>
9 * Gildas Bazin <gbazin@videolan.org>
10 * Derk-Jan Hartman <hartman at videolan dot org>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
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 General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
37 #include <vlc_codec.h>
38 #include <vlc_block.h>
40 #include "vlc_block_helper.h"
43 /*****************************************************************************
45 *****************************************************************************/
46 static int Open ( vlc_object_t * );
47 static void Close( vlc_object_t * );
50 set_category( CAT_SOUT );
51 set_subcategory( SUBCAT_SOUT_PACKETIZER );
52 set_description( _("H.264 video packetizer") );
53 set_capability( "packetizer", 50 );
54 set_callbacks( Open, Close );
58 /****************************************************************************
60 ****************************************************************************/
61 static block_t *Packetize( decoder_t *, block_t ** );
62 static block_t *PacketizeAVC1( decoder_t *, block_t ** );
70 int i_pic_parameter_set_id;
74 int i_bottom_field_flag;
78 int i_pic_order_cnt_lsb;
79 int i_delta_pic_order_cnt_bottom;
81 int i_delta_pic_order_cnt0;
82 int i_delta_pic_order_cnt1;
87 block_bytestream_t bytestream;
101 int i_avcC_length_size;
105 /* Useful values of the Sequence Parameter Set */
106 int i_log2_max_frame_num;
107 int b_frame_mbs_only;
108 int i_pic_order_cnt_type;
109 int i_delta_pic_order_always_zero_flag;
110 int i_log2_max_pic_order_cnt_lsb;
112 /* Value from Picture Parameter Set */
113 int i_pic_order_present_flag;
115 /* Useful values of the Slice Header */
132 NAL_SLICE_IDR = 5, /* ref_idc != 0 */
133 NAL_SEI = 6, /* ref_idc == 0 */
137 /* ref_idc == 0 for 6,9,10,11,12 */
142 NAL_PRIORITY_DISPOSABLE = 0,
143 NAL_PRIORITY_LOW = 1,
144 NAL_PRIORITY_HIGH = 2,
145 NAL_PRIORITY_HIGHEST = 3,
148 static block_t *ParseNALBlock( decoder_t *, block_t * );
150 static block_t *nal_get_annexeb( decoder_t *, uint8_t *p, int );
152 /*****************************************************************************
153 * Open: probe the packetizer and return score
154 * When opening after demux, the packetizer is only loaded AFTER the decoder
155 * That means that what you set in fmt_out is ignored by the decoder in this special case
156 *****************************************************************************/
157 static int Open( vlc_object_t *p_this )
159 decoder_t *p_dec = (decoder_t*)p_this;
160 decoder_sys_t *p_sys;
162 if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'h', '2', '6', '4') &&
163 p_dec->fmt_in.i_codec != VLC_FOURCC( 'H', '2', '6', '4') &&
164 p_dec->fmt_in.i_codec != VLC_FOURCC( 'V', 'S', 'S', 'H') &&
165 p_dec->fmt_in.i_codec != VLC_FOURCC( 'v', 's', 's', 'h') &&
166 p_dec->fmt_in.i_codec != VLC_FOURCC( 'D', 'A', 'V', 'C') &&
167 ( p_dec->fmt_in.i_codec != VLC_FOURCC( 'a', 'v', 'c', '1') ||
168 p_dec->fmt_in.i_extra < 7 ) )
173 /* Allocate the memory needed to store the decoder's structure */
174 if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
176 msg_Err( p_dec, "out of memory" );
179 p_sys->i_state = STATE_NOSYNC;
181 p_sys->startcode[0] = 0;
182 p_sys->startcode[1] = 0;
183 p_sys->startcode[2] = 0;
184 p_sys->startcode[3] = 1;
185 p_sys->bytestream = block_BytestreamInit();
186 p_sys->b_slice = VLC_FALSE;
187 p_sys->p_frame = NULL;
188 p_sys->b_sps = VLC_FALSE;
189 p_sys->b_pps = VLC_FALSE;
192 p_sys->b_header= VLC_FALSE;
194 p_sys->slice.i_nal_type = -1;
195 p_sys->slice.i_nal_ref_idc = -1;
196 p_sys->slice.i_idr_pic_id = -1;
197 p_sys->slice.i_frame_num = -1;
198 p_sys->slice.i_frame_type = 0;
199 p_sys->slice.i_pic_parameter_set_id = -1;
200 p_sys->slice.i_field_pic_flag = 0;
201 p_sys->slice.i_bottom_field_flag = -1;
202 p_sys->slice.i_pic_order_cnt_lsb = -1;
203 p_sys->slice.i_delta_pic_order_cnt_bottom = -1;
205 /* Setup properties */
206 es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
207 p_dec->fmt_out.i_codec = VLC_FOURCC( 'h', '2', '6', '4' );
209 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
211 /* This type of stream is produced by mp4 and matroska
212 * when we want to store it in another streamformat, you need to convert
213 * The fmt_in.p_extra should ALWAYS contain the avcC
214 * The fmt_out.p_extra should contain all the SPS and PPS with 4 byte startcodes */
215 uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
220 p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
224 for( i = 0; i < i_sps; i++ )
226 int i_length = GetWBE( p );
227 block_t *p_sps = nal_get_annexeb( p_dec, p + 2, i_length );
229 p_sys->p_sps = block_Duplicate( p_sps );
230 p_sps->i_pts = p_sps->i_dts = mdate();
231 ParseNALBlock( p_dec, p_sps );
236 for( i = 0; i < i_pps; i++ )
238 int i_length = GetWBE( p );
239 block_t *p_pps = nal_get_annexeb( p_dec, p + 2, i_length );
241 p_sys->p_pps = block_Duplicate( p_pps );
242 p_pps->i_pts = p_pps->i_dts = mdate();
243 ParseNALBlock( p_dec, p_pps );
246 msg_Dbg( p_dec, "avcC length size=%d, sps=%d, pps=%d",
247 p_sys->i_avcC_length_size, i_sps, i_pps );
249 /* FIXME: FFMPEG isn't happy at all if you leave this */
250 if( p_dec->fmt_out.i_extra ) free( p_dec->fmt_out.p_extra );
251 p_dec->fmt_out.i_extra = 0; p_dec->fmt_out.p_extra = NULL;
253 /* Set the new extradata */
254 p_dec->fmt_out.i_extra = p_sys->p_pps->i_buffer + p_sys->p_sps->i_buffer;
255 p_dec->fmt_out.p_extra = (uint8_t*)malloc( p_dec->fmt_out.i_extra );
256 if( p_dec->fmt_out.p_extra )
258 memcpy( (uint8_t*)p_dec->fmt_out.p_extra, p_sys->p_sps->p_buffer, p_sys->p_sps->i_buffer);
259 memcpy( (uint8_t*)p_dec->fmt_out.p_extra+p_sys->p_sps->i_buffer, p_sys->p_pps->p_buffer, p_sys->p_pps->i_buffer);
260 p_sys->b_header = VLC_TRUE;
262 else p_dec->fmt_out.i_extra = 0;
265 p_dec->pf_packetize = PacketizeAVC1;
269 /* This type of stream contains data with 3 of 4 byte startcodes
270 * The fmt_in.p_extra MAY contain SPS/PPS with 4 byte startcodes
271 * The fmt_out.p_extra should be the same */
274 p_dec->pf_packetize = Packetize;
277 if( p_dec->fmt_in.i_extra > 0 )
279 block_t *p_init = block_New( p_dec, p_dec->fmt_in.i_extra );
282 memcpy( p_init->p_buffer, p_dec->fmt_in.p_extra,
283 p_dec->fmt_in.i_extra );
285 while( ( p_pic = Packetize( p_dec, &p_init ) ) )
287 /* Should not occur because we should only receive SPS/PPS */
288 block_Release( p_pic );
296 /*****************************************************************************
297 * Close: clean up the packetizer
298 *****************************************************************************/
299 static void Close( vlc_object_t *p_this )
301 decoder_t *p_dec = (decoder_t*)p_this;
302 decoder_sys_t *p_sys = p_dec->p_sys;
304 if( p_sys->p_frame ) block_ChainRelease( p_sys->p_frame );
305 if( p_sys->p_sps ) block_Release( p_sys->p_sps );
306 if( p_sys->p_pps ) block_Release( p_sys->p_pps );
307 block_BytestreamRelease( &p_sys->bytestream );
311 /****************************************************************************
312 * Packetize: the whole thing
313 * Search for the startcodes 3 or more bytes
314 * Feed ParseNALBlock ALWAYS with 4 byte startcode prepended NALs
315 ****************************************************************************/
316 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
318 decoder_sys_t *p_sys = p_dec->p_sys;
321 if( !pp_block || !*pp_block )
324 if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
326 if( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED )
328 p_sys->i_state = STATE_NOSYNC;
329 block_BytestreamFlush( &p_sys->bytestream );
332 block_ChainRelease( p_sys->p_frame );
333 p_sys->p_frame = NULL;
334 p_sys->slice.i_frame_type = 0;
335 p_sys->b_slice = VLC_FALSE;
337 block_Release( *pp_block );
341 block_BytestreamPush( &p_sys->bytestream, *pp_block );
345 switch( p_sys->i_state )
348 /* Skip until 3 byte startcode 0 0 1 */
349 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
350 &p_sys->i_offset, p_sys->startcode+1, 3 ) == VLC_SUCCESS)
352 p_sys->i_state = STATE_NEXT_SYNC;
355 if( p_sys->i_offset )
358 block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
360 block_BytestreamFlush( &p_sys->bytestream );
363 if( p_sys->i_state != STATE_NEXT_SYNC )
369 p_sys->i_offset = 1; /* To find next startcode */
371 case STATE_NEXT_SYNC:
372 /* Find the next 3 byte startcode 0 0 1*/
373 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
374 &p_sys->i_offset, p_sys->startcode+1, 3 ) != VLC_SUCCESS)
380 /* Get the new fragment and set the pts/dts */
381 p_pic = block_New( p_dec, p_sys->i_offset +1 );
382 p_pic->i_pts = p_sys->bytestream.p_block->i_pts;
383 p_pic->i_dts = p_sys->bytestream.p_block->i_dts;
384 /* Force 4 byte startcode 0 0 0 1 */
385 p_pic->p_buffer[0] = 0;
387 block_GetBytes( &p_sys->bytestream, &p_pic->p_buffer[1],
390 /* Remove trailing 0 bytes */
391 while( p_pic->i_buffer && (!p_pic->p_buffer[p_pic->i_buffer-1] ) )
396 if( !( p_pic = ParseNALBlock( p_dec, p_pic ) ) )
398 p_sys->i_state = STATE_NOSYNC;
402 msg_Dbg( p_dec, "pts="I64Fd" dts="I64Fd,
403 p_pic->i_pts, p_pic->i_dts );
406 /* So p_block doesn't get re-added several times */
407 *pp_block = block_BytestreamPop( &p_sys->bytestream );
409 p_sys->i_state = STATE_NOSYNC;
416 /****************************************************************************
417 * PacketizeAVC1: Takes VCL blocks of data and creates annexe B type NAL stream
418 * Will always use 4 byte 0 0 0 1 startcodes
419 * Will prepend a SPS and PPS before each keyframe
420 ****************************************************************************/
421 static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
423 decoder_sys_t *p_sys = p_dec->p_sys;
425 block_t *p_ret = NULL;
428 if( !pp_block || !*pp_block )
430 if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
432 block_Release( *pp_block );
439 for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
445 for( i = 0; i < p_sys->i_avcC_length_size; i++ )
447 i_size = (i_size << 8) | (*p++);
451 i_size > ( p_block->p_buffer + p_block->i_buffer - p ) )
453 msg_Err( p_dec, "Broken frame : size %d is too big", i_size );
457 block_t *p_part = nal_get_annexeb( p_dec, p, i_size );
460 p_part->i_dts = p_block->i_dts;
461 p_part->i_pts = p_block->i_pts;
464 if( ( p_pic = ParseNALBlock( p_dec, p_part ) ) )
466 block_ChainAppend( &p_ret, p_pic );
470 block_Release( p_block );
475 static block_t *nal_get_annexeb( decoder_t *p_dec, uint8_t *p, int i_size )
479 p_nal = block_New( p_dec, 4 + i_size );
480 if( !p_nal ) return NULL;
483 p_nal->p_buffer[0] = 0x00;
484 p_nal->p_buffer[1] = 0x00;
485 p_nal->p_buffer[2] = 0x00;
486 p_nal->p_buffer[3] = 0x01;
489 memcpy( &p_nal->p_buffer[4], p, i_size );
494 static void nal_get_decoded( uint8_t **pp_ret, int *pi_ret,
495 uint8_t *src, int i_src )
497 uint8_t *end = &src[i_src];
498 uint8_t *dst = malloc( i_src );
506 if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
518 *pi_ret = dst - *pp_ret;
521 static inline int bs_read_ue( bs_t *s )
525 while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
529 return( ( 1 << i) - 1 + bs_read( s, i ) );
532 static inline int bs_read_se( bs_t *s )
534 int val = bs_read_ue( s );
536 return val&0x01 ? (val+1)/2 : -(val/2);
539 /*****************************************************************************
540 * ParseNALBlock: parses annexB type NALs
541 * All p_frag blocks are required to start with 0 0 0 1 4-byte startcode
542 *****************************************************************************/
543 static block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
545 decoder_sys_t *p_sys = p_dec->p_sys;
546 block_t *p_pic = NULL;
548 const int i_nal_ref_idc = (p_frag->p_buffer[4] >> 5)&0x03;
549 const int i_nal_type = p_frag->p_buffer[4]&0x1f;
553 if( !p_sys->b_header && p_sys->slice.i_frame_type != BLOCK_FLAG_TYPE_I) \
556 if( p_sys->slice.i_frame_type == BLOCK_FLAG_TYPE_I && p_sys->p_sps && p_sys->p_pps ) \
558 block_t *p_sps = block_Duplicate( p_sys->p_sps ); \
559 block_t *p_pps = block_Duplicate( p_sys->p_pps ); \
560 p_sps->i_dts = p_sys->p_frame->i_dts; \
561 p_sps->i_pts = p_sys->p_frame->i_pts; \
562 block_ChainAppend( &p_sps, p_pps ); \
563 block_ChainAppend( &p_sps, p_sys->p_frame ); \
564 p_sys->b_header = VLC_TRUE; \
565 p_pic = block_ChainGather( p_sps ); \
567 p_pic = block_ChainGather( p_sys->p_frame ); \
569 p_pic->i_length = 0; /* FIXME */ \
570 p_pic->i_flags |= p_sys->slice.i_frame_type; \
572 p_sys->slice.i_frame_type = 0; \
573 p_sys->p_frame = NULL; \
574 p_sys->b_slice = VLC_FALSE; \
577 if( p_sys->b_slice && ( !p_sys->b_sps || !p_sys->b_pps ) )
579 block_ChainRelease( p_sys->p_frame );
580 msg_Warn( p_dec, "waiting for SPS/PPS" );
583 p_sys->slice.i_frame_type = 0;
584 p_sys->p_frame = NULL;
585 p_sys->b_slice = VLC_FALSE;
588 if( ( !p_sys->b_sps || !p_sys->b_pps ) &&
589 i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
591 p_sys->b_slice = VLC_TRUE;
592 /* Fragment will be discarded later on */
594 else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
597 int i_dec = 0, i_first_mb, i_slice_type;
602 /* do not convert the whole frame */
603 nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
604 __MIN( p_frag->i_buffer - 5, 60 ) );
605 bs_init( &s, dec, i_dec );
607 /* first_mb_in_slice */
608 i_first_mb = bs_read_ue( &s );
611 switch( (i_slice_type = bs_read_ue( &s )) )
614 slice.i_frame_type = BLOCK_FLAG_TYPE_P;
617 slice.i_frame_type = BLOCK_FLAG_TYPE_B;
620 slice.i_frame_type = BLOCK_FLAG_TYPE_I;
622 case 3: case 8: /* SP */
623 slice.i_frame_type = BLOCK_FLAG_TYPE_P;
626 slice.i_frame_type = BLOCK_FLAG_TYPE_I;
629 slice.i_frame_type = 0;
634 slice.i_nal_type = i_nal_type;
635 slice.i_nal_ref_idc = i_nal_ref_idc;
637 slice.i_pic_parameter_set_id = bs_read_ue( &s );
638 slice.i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );
640 slice.i_field_pic_flag = 0;
641 slice.i_bottom_field_flag = -1;
642 if( !p_sys->b_frame_mbs_only )
645 slice.i_field_pic_flag = bs_read( &s, 1 );
646 if( slice.i_field_pic_flag )
647 slice.i_bottom_field_flag = bs_read( &s, 1 );
650 slice.i_idr_pic_id = p_sys->slice.i_idr_pic_id;
651 if( slice.i_nal_type == NAL_SLICE_IDR )
652 slice.i_idr_pic_id = bs_read_ue( &s );
654 slice.i_pic_order_cnt_lsb = -1;
655 slice.i_delta_pic_order_cnt_bottom = -1;
656 slice.i_delta_pic_order_cnt0 = 0;
657 slice.i_delta_pic_order_cnt1 = 0;
658 if( p_sys->i_pic_order_cnt_type == 0 )
660 slice.i_pic_order_cnt_lsb = bs_read( &s, p_sys->i_log2_max_pic_order_cnt_lsb + 4 );
661 if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
662 slice.i_delta_pic_order_cnt_bottom = bs_read_se( &s );
664 else if( (p_sys->i_pic_order_cnt_type == 1) &&
665 (!p_sys->i_delta_pic_order_always_zero_flag) )
667 slice.i_delta_pic_order_cnt0 = bs_read_se( &s );
668 if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
669 slice.i_delta_pic_order_cnt1 = bs_read_se( &s );
672 /* Detection of the first VCL NAL unit of a primary coded picture
675 if( slice.i_frame_num != p_sys->slice.i_frame_num ||
676 slice.i_pic_parameter_set_id != p_sys->slice.i_pic_parameter_set_id ||
677 slice.i_field_pic_flag != p_sys->slice.i_field_pic_flag ||
678 slice.i_nal_ref_idc != p_sys->slice.i_nal_ref_idc )
680 if( (slice.i_bottom_field_flag != -1) &&
681 (p_sys->slice.i_bottom_field_flag != -1) &&
682 (slice.i_bottom_field_flag != p_sys->slice.i_bottom_field_flag) )
684 if( p_sys->i_pic_order_cnt_type == 0 &&
685 ( slice.i_pic_order_cnt_lsb != p_sys->slice.i_pic_order_cnt_lsb ||
686 slice.i_delta_pic_order_cnt_bottom != p_sys->slice.i_delta_pic_order_cnt_bottom ) )
688 else if( p_sys->i_pic_order_cnt_type == 1 &&
689 ( slice.i_delta_pic_order_cnt0 != p_sys->slice.i_delta_pic_order_cnt0 ||
690 slice.i_delta_pic_order_cnt1 != p_sys->slice.i_delta_pic_order_cnt1 ) )
692 if( ( slice.i_nal_type == NAL_SLICE_IDR || p_sys->slice.i_nal_type == NAL_SLICE_IDR ) &&
693 ( slice.i_nal_type != p_sys->slice.i_nal_type || slice.i_idr_pic_id != p_sys->slice.i_idr_pic_id ) )
697 p_sys->slice = slice;
699 if( b_pic && p_sys->b_slice )
702 p_sys->b_slice = VLC_TRUE;
706 else if( i_nal_type == NAL_SPS )
713 if( !p_sys->b_sps ) msg_Dbg( p_dec, "found NAL_SPS" );
715 p_sys->b_sps = VLC_TRUE;
717 nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
718 p_frag->i_buffer - 5 );
720 bs_init( &s, dec, i_dec );
721 /* Skip profile(8), constraint_set012, reserver(5), level(8) */
722 bs_skip( &s, 8 + 1+1+1 + 5 + 8 );
725 /* Skip i_log2_max_frame_num */
726 p_sys->i_log2_max_frame_num = bs_read_ue( &s );
727 if( p_sys->i_log2_max_frame_num > 12)
728 p_sys->i_log2_max_frame_num = 12;
730 p_sys->i_pic_order_cnt_type = bs_read_ue( &s );
731 if( p_sys->i_pic_order_cnt_type == 0 )
733 /* skip i_log2_max_poc_lsb */
734 p_sys->i_log2_max_pic_order_cnt_lsb = bs_read_ue( &s );
735 if( p_sys->i_log2_max_pic_order_cnt_lsb > 12 )
736 p_sys->i_log2_max_pic_order_cnt_lsb = 12;
738 else if( p_sys->i_pic_order_cnt_type == 1 )
741 /* skip b_delta_pic_order_always_zero */
742 p_sys->i_delta_pic_order_always_zero_flag = bs_read( &s, 1 );
743 /* skip i_offset_for_non_ref_pic */
745 /* skip i_offset_for_top_to_bottom_field */
747 /* read i_num_ref_frames_in_poc_cycle */
748 i_cycle = bs_read_ue( &s );
749 if( i_cycle > 256 ) i_cycle = 256;
752 /* skip i_offset_for_ref_frame */
756 /* i_num_ref_frames */
758 /* b_gaps_in_frame_num_value_allowed */
762 p_dec->fmt_out.video.i_width = 16 * ( bs_read_ue( &s ) + 1 );
763 p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );
765 /* b_frame_mbs_only */
766 p_sys->b_frame_mbs_only = bs_read( &s, 1 );
767 if( p_sys->b_frame_mbs_only == 0 )
771 /* b_direct8x8_inference */
775 i_tmp = bs_read( &s, 1 );
789 i_tmp = bs_read( &s, 1 );
792 /* read the aspect ratio part if any FIXME check it */
793 i_tmp = bs_read( &s, 1 );
796 static const struct { int w, h; } sar[14] =
798 { 0, 0 }, { 1, 1 }, { 12, 11 }, { 10, 11 },
799 { 16, 11 }, { 40, 33 }, { 24, 11 }, { 20, 11 },
800 { 32, 11 }, { 80, 33 }, { 18, 11 }, { 15, 11 },
801 { 64, 33 }, { 160,99 },
803 int i_sar = bs_read( &s, 8 );
813 w = bs_read( &s, 16 );
814 h = bs_read( &s, 16 );
817 p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR * w /
818 h * p_dec->fmt_out.video.i_width /
819 p_dec->fmt_out.video.i_height;
821 p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR;
827 if( p_sys->b_slice ) OUTPUT;
829 /* We have a new SPS */
830 if( p_sys->p_sps ) block_Release( p_sys->p_sps );
831 p_sys->p_sps = p_frag;
833 /* Do not append the SPS because we will insert it on keyframes */
836 else if( i_nal_type == NAL_PPS )
840 bs_init( &s, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
841 bs_read_ue( &s ); // pps id
842 bs_read_ue( &s ); // sps id
843 bs_skip( &s, 1 ); // entropy coding mode flag
844 p_sys->i_pic_order_present_flag = bs_read( &s, 1 );
846 if( !p_sys->b_pps ) msg_Dbg( p_dec, "found NAL_PPS" );
847 p_sys->b_pps = VLC_TRUE;
851 if( p_sys->b_slice ) OUTPUT;
853 /* We have a new PPS */
854 if( p_sys->p_pps ) block_Release( p_sys->p_pps );
855 p_sys->p_pps = p_frag;
857 /* Do not append the PPS because we will insert it on keyframes */
860 else if( i_nal_type == NAL_AU_DELIMITER ||
861 i_nal_type == NAL_SEI ||
862 ( i_nal_type >= 13 && i_nal_type <= 18 ) )
864 if( p_sys->b_slice ) OUTPUT;
869 /* Append the block */
870 block_ChainAppend( &p_sys->p_frame, p_frag );