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 *****************************************************************************/
33 #include <vlc_codec.h>
34 #include <vlc_block.h>
36 #include "vlc_block_helper.h"
39 /*****************************************************************************
41 *****************************************************************************/
42 static int Open ( vlc_object_t * );
43 static void Close( vlc_object_t * );
46 set_category( CAT_SOUT );
47 set_subcategory( SUBCAT_SOUT_PACKETIZER );
48 set_description( _("H.264 video packetizer") );
49 set_capability( "packetizer", 50 );
50 set_callbacks( Open, Close );
54 /****************************************************************************
56 ****************************************************************************/
57 static block_t *Packetize( decoder_t *, block_t ** );
58 static block_t *PacketizeAVC1( decoder_t *, block_t ** );
66 int i_pic_parameter_set_id;
70 int i_bottom_field_flag;
74 int i_pic_order_cnt_lsb;
75 int i_delta_pic_order_cnt_bottom;
77 int i_delta_pic_order_cnt0;
78 int i_delta_pic_order_cnt1;
83 block_bytestream_t bytestream;
97 int i_avcC_length_size;
101 /* Useful values of the Sequence Parameter Set */
102 int i_log2_max_frame_num;
103 int b_frame_mbs_only;
104 int i_pic_order_cnt_type;
105 int i_delta_pic_order_always_zero_flag;
106 int i_log2_max_pic_order_cnt_lsb;
108 /* Value from Picture Parameter Set */
109 int i_pic_order_present_flag;
111 /* Useful values of the Slice Header */
128 NAL_SLICE_IDR = 5, /* ref_idc != 0 */
129 NAL_SEI = 6, /* ref_idc == 0 */
133 /* ref_idc == 0 for 6,9,10,11,12 */
138 NAL_PRIORITY_DISPOSABLE = 0,
139 NAL_PRIORITY_LOW = 1,
140 NAL_PRIORITY_HIGH = 2,
141 NAL_PRIORITY_HIGHEST = 3,
144 static block_t *ParseNALBlock( decoder_t *, block_t * );
146 static block_t *nal_get_annexeb( decoder_t *, uint8_t *p, int );
148 /*****************************************************************************
149 * Open: probe the packetizer and return score
150 * When opening after demux, the packetizer is only loaded AFTER the decoder
151 * That means that what you set in fmt_out is ignored by the decoder in this special case
152 *****************************************************************************/
153 static int Open( vlc_object_t *p_this )
155 decoder_t *p_dec = (decoder_t*)p_this;
156 decoder_sys_t *p_sys;
158 if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'h', '2', '6', '4') &&
159 p_dec->fmt_in.i_codec != VLC_FOURCC( 'H', '2', '6', '4') &&
160 p_dec->fmt_in.i_codec != VLC_FOURCC( 'V', 'S', 'S', 'H') &&
161 p_dec->fmt_in.i_codec != VLC_FOURCC( 'v', 's', 's', 'h') &&
162 p_dec->fmt_in.i_codec != VLC_FOURCC( 'D', 'A', 'V', 'C') &&
163 ( p_dec->fmt_in.i_codec != VLC_FOURCC( 'a', 'v', 'c', '1') ||
164 p_dec->fmt_in.i_extra < 7 ) )
169 /* Allocate the memory needed to store the decoder's structure */
170 if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
172 msg_Err( p_dec, "out of memory" );
175 p_sys->i_state = STATE_NOSYNC;
177 p_sys->startcode[0] = 0;
178 p_sys->startcode[1] = 0;
179 p_sys->startcode[2] = 0;
180 p_sys->startcode[3] = 1;
181 p_sys->bytestream = block_BytestreamInit( p_dec );
182 p_sys->b_slice = VLC_FALSE;
183 p_sys->p_frame = NULL;
184 p_sys->b_sps = VLC_FALSE;
185 p_sys->b_pps = VLC_FALSE;
188 p_sys->b_header= VLC_FALSE;
190 p_sys->slice.i_nal_type = -1;
191 p_sys->slice.i_nal_ref_idc = -1;
192 p_sys->slice.i_idr_pic_id = -1;
193 p_sys->slice.i_frame_num = -1;
194 p_sys->slice.i_frame_type = 0;
195 p_sys->slice.i_pic_parameter_set_id = -1;
196 p_sys->slice.i_field_pic_flag = 0;
197 p_sys->slice.i_bottom_field_flag = -1;
198 p_sys->slice.i_pic_order_cnt_lsb = -1;
199 p_sys->slice.i_delta_pic_order_cnt_bottom = -1;
201 /* Setup properties */
202 es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
203 p_dec->fmt_out.i_codec = VLC_FOURCC( 'h', '2', '6', '4' );
205 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
207 /* This type of stream is produced by mp4 and matroska
208 * when we want to store it in another streamformat, you need to convert
209 * The fmt_in.p_extra should ALWAYS contain the avcC
210 * The fmt_out.p_extra should contain all the SPS and PPS with 4 byte startcodes */
211 uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
216 p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
220 for( i = 0; i < i_sps; i++ )
222 int i_length = GetWBE( p );
223 block_t *p_sps = nal_get_annexeb( p_dec, p + 2, i_length );
225 p_sys->p_sps = block_Duplicate( p_sps );
226 p_sps->i_pts = p_sps->i_dts = mdate();
227 ParseNALBlock( p_dec, p_sps );
232 for( i = 0; i < i_pps; i++ )
234 int i_length = GetWBE( p );
235 block_t *p_pps = nal_get_annexeb( p_dec, p + 2, i_length );
237 p_sys->p_pps = block_Duplicate( p_pps );
238 p_pps->i_pts = p_pps->i_dts = mdate();
239 ParseNALBlock( p_dec, p_pps );
242 msg_Dbg( p_dec, "avcC length size=%d, sps=%d, pps=%d",
243 p_sys->i_avcC_length_size, i_sps, i_pps );
245 /* FIXME: FFMPEG isn't happy at all if you leave this */
246 if( p_dec->fmt_out.i_extra ) free( p_dec->fmt_out.p_extra );
247 p_dec->fmt_out.i_extra = 0; p_dec->fmt_out.p_extra = NULL;
249 /* Set the new extradata */
250 p_dec->fmt_out.i_extra = p_sys->p_pps->i_buffer + p_sys->p_sps->i_buffer;
251 p_dec->fmt_out.p_extra = (uint8_t*)malloc( p_dec->fmt_out.i_extra );
252 memcpy( (uint8_t*)p_dec->fmt_out.p_extra, p_sys->p_sps->p_buffer, p_sys->p_sps->i_buffer);
253 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);
254 p_sys->b_header = VLC_TRUE;
257 p_dec->pf_packetize = PacketizeAVC1;
261 /* This type of stream contains data with 3 of 4 byte startcodes
262 * The fmt_in.p_extra MAY contain SPS/PPS with 4 byte startcodes
263 * The fmt_out.p_extra should be the same */
266 p_dec->pf_packetize = Packetize;
269 if( p_dec->fmt_in.i_extra > 0 )
271 block_t *p_init = block_New( p_dec, p_dec->fmt_in.i_extra );
274 memcpy( p_init->p_buffer, p_dec->fmt_in.p_extra,
275 p_dec->fmt_in.i_extra );
277 while( ( p_pic = Packetize( p_dec, &p_init ) ) )
279 /* Should not occur because we should only receive SPS/PPS */
280 block_Release( p_pic );
288 /*****************************************************************************
289 * Close: clean up the packetizer
290 *****************************************************************************/
291 static void Close( vlc_object_t *p_this )
293 decoder_t *p_dec = (decoder_t*)p_this;
294 decoder_sys_t *p_sys = p_dec->p_sys;
296 if( p_sys->p_frame ) block_ChainRelease( p_sys->p_frame );
297 if( p_sys->p_sps ) block_Release( p_sys->p_sps );
298 if( p_sys->p_pps ) block_Release( p_sys->p_pps );
299 block_BytestreamRelease( &p_sys->bytestream );
303 /****************************************************************************
304 * Packetize: the whole thing
305 * Search for the startcodes 3 or more bytes
306 * Feed ParseNALBlock ALWAYS with 4 byte startcode prepended NALs
307 ****************************************************************************/
308 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
310 decoder_sys_t *p_sys = p_dec->p_sys;
313 if( !pp_block || !*pp_block )
316 if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
318 if( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED )
320 p_sys->i_state = STATE_NOSYNC;
321 block_BytestreamFlush( &p_sys->bytestream );
324 block_ChainRelease( p_sys->p_frame );
325 p_sys->p_frame = NULL;
326 p_sys->slice.i_frame_type = 0;
327 p_sys->b_slice = VLC_FALSE;
329 block_Release( *pp_block );
333 block_BytestreamPush( &p_sys->bytestream, *pp_block );
337 switch( p_sys->i_state )
340 /* Skip until 3 byte startcode 0 0 1 */
341 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
342 &p_sys->i_offset, p_sys->startcode+1, 3 ) == VLC_SUCCESS)
344 p_sys->i_state = STATE_NEXT_SYNC;
347 if( p_sys->i_offset )
350 block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
352 block_BytestreamFlush( &p_sys->bytestream );
355 if( p_sys->i_state != STATE_NEXT_SYNC )
361 p_sys->i_offset = 1; /* To find next startcode */
363 case STATE_NEXT_SYNC:
364 /* Find the next 3 byte startcode 0 0 1*/
365 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
366 &p_sys->i_offset, p_sys->startcode+1, 3 ) != VLC_SUCCESS)
372 /* Get the new fragment and set the pts/dts */
373 p_pic = block_New( p_dec, p_sys->i_offset +1 );
374 p_pic->i_pts = p_sys->bytestream.p_block->i_pts;
375 p_pic->i_dts = p_sys->bytestream.p_block->i_dts;
376 /* Force 4 byte startcode 0 0 0 1 */
377 p_pic->p_buffer[0] = 0;
379 block_GetBytes( &p_sys->bytestream, &p_pic->p_buffer[1],
382 /* Remove trailing 0 bytes */
383 while( p_pic->i_buffer && (!p_pic->p_buffer[p_pic->i_buffer-1] ) )
388 if( !( p_pic = ParseNALBlock( p_dec, p_pic ) ) )
390 p_sys->i_state = STATE_NOSYNC;
394 msg_Dbg( p_dec, "pts="I64Fd" dts="I64Fd,
395 p_pic->i_pts, p_pic->i_dts );
398 /* So p_block doesn't get re-added several times */
399 *pp_block = block_BytestreamPop( &p_sys->bytestream );
401 p_sys->i_state = STATE_NOSYNC;
408 /****************************************************************************
409 * PacketizeAVC1: Takes VCL blocks of data and creates annexe B type NAL stream
410 * Will always use 4 byte 0 0 0 1 startcodes
411 * Will prepend a SPS and PPS before each keyframe
412 ****************************************************************************/
413 static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
415 decoder_sys_t *p_sys = p_dec->p_sys;
417 block_t *p_ret = NULL;
420 if( !pp_block || !*pp_block )
422 if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
424 block_Release( *pp_block );
431 for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
437 for( i = 0; i < p_sys->i_avcC_length_size; i++ )
439 i_size = (i_size << 8) | (*p++);
444 block_t *p_part = nal_get_annexeb( p_dec, p, i_size );
446 p_part->i_dts = p_block->i_dts;
447 p_part->i_pts = p_block->i_pts;
450 if( ( p_pic = ParseNALBlock( p_dec, p_part ) ) )
452 block_ChainAppend( &p_ret, p_pic );
457 block_Release( p_block );
462 static block_t *nal_get_annexeb( decoder_t *p_dec, uint8_t *p, int i_size )
466 p_nal = block_New( p_dec, 4 + i_size );
469 p_nal->p_buffer[0] = 0x00;
470 p_nal->p_buffer[1] = 0x00;
471 p_nal->p_buffer[2] = 0x00;
472 p_nal->p_buffer[3] = 0x01;
475 memcpy( &p_nal->p_buffer[4], p, i_size );
480 static void nal_get_decoded( uint8_t **pp_ret, int *pi_ret,
481 uint8_t *src, int i_src )
483 uint8_t *end = &src[i_src];
484 uint8_t *dst = malloc( i_src );
490 if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
502 *pi_ret = dst - *pp_ret;
505 static inline int bs_read_ue( bs_t *s )
509 while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
513 return( ( 1 << i) - 1 + bs_read( s, i ) );
516 static inline int bs_read_se( bs_t *s )
518 int val = bs_read_ue( s );
520 return val&0x01 ? (val+1)/2 : -(val/2);
524 /*****************************************************************************
525 * ParseNALBlock: parses annexB type NALs
526 * All p_frag blocks are required to start with 0 0 0 1 4-byte startcode
527 *****************************************************************************/
528 static block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
530 decoder_sys_t *p_sys = p_dec->p_sys;
531 block_t *p_pic = NULL;
533 const int i_nal_ref_idc = (p_frag->p_buffer[4] >> 5)&0x03;
534 const int i_nal_type = p_frag->p_buffer[4]&0x1f;
538 if( !p_sys->b_header && p_sys->slice.i_frame_type != BLOCK_FLAG_TYPE_I) \
541 if( p_sys->slice.i_frame_type == BLOCK_FLAG_TYPE_I && p_sys->p_sps && p_sys->p_pps && !p_sys->b_header ) \
543 block_t *p_sps = block_Duplicate( p_sys->p_sps ); \
544 block_t *p_pps = block_Duplicate( p_sys->p_pps ); \
545 p_sps->i_dts = p_sys->p_frame->i_dts; \
546 p_sps->i_pts = p_sys->p_frame->i_pts; \
547 block_ChainAppend( &p_sps, p_pps ); \
548 block_ChainAppend( &p_sps, p_sys->p_frame ); \
549 p_sys->b_header = VLC_TRUE; \
550 p_pic = block_ChainGather( p_sps ); \
552 p_pic = block_ChainGather( p_sys->p_frame ); \
554 p_pic->i_length = 0; /* FIXME */ \
555 p_pic->i_flags |= p_sys->slice.i_frame_type; \
557 p_sys->slice.i_frame_type = 0; \
558 p_sys->p_frame = NULL; \
559 p_sys->b_slice = VLC_FALSE; \
562 if( p_sys->b_slice && ( !p_sys->b_sps || !p_sys->b_pps ) )
564 block_ChainRelease( p_sys->p_frame );
565 msg_Warn( p_dec, "waiting for SPS/PPS" );
568 p_sys->slice.i_frame_type = 0;
569 p_sys->p_frame = NULL;
570 p_sys->b_slice = VLC_FALSE;
573 if( ( !p_sys->b_sps || !p_sys->b_pps ) &&
574 i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
576 p_sys->b_slice = VLC_TRUE;
577 /* Fragment will be discarded later on */
579 else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
582 int i_dec, i_first_mb, i_slice_type;
587 /* do not convert the whole frame */
588 nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
589 __MIN( p_frag->i_buffer - 5, 60 ) );
590 bs_init( &s, dec, i_dec );
592 /* first_mb_in_slice */
593 i_first_mb = bs_read_ue( &s );
596 switch( (i_slice_type = bs_read_ue( &s )) )
599 slice.i_frame_type = BLOCK_FLAG_TYPE_P;
602 slice.i_frame_type = BLOCK_FLAG_TYPE_B;
605 slice.i_frame_type = BLOCK_FLAG_TYPE_I;
607 case 3: case 8: /* SP */
608 slice.i_frame_type = BLOCK_FLAG_TYPE_P;
611 slice.i_frame_type = BLOCK_FLAG_TYPE_I;
614 slice.i_frame_type = 0;
619 slice.i_nal_type = i_nal_type;
620 slice.i_nal_ref_idc = i_nal_ref_idc;
622 slice.i_pic_parameter_set_id = bs_read_ue( &s );
623 slice.i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );
625 slice.i_field_pic_flag = 0;
626 slice.i_bottom_field_flag = -1;
627 if( !p_sys->b_frame_mbs_only )
630 slice.i_field_pic_flag = bs_read( &s, 1 );
631 if( slice.i_field_pic_flag )
632 slice.i_bottom_field_flag = bs_read( &s, 1 );
635 slice.i_idr_pic_id = p_sys->slice.i_idr_pic_id;
636 if( slice.i_nal_type == NAL_SLICE_IDR )
637 slice.i_idr_pic_id = bs_read_ue( &s );
639 slice.i_pic_order_cnt_lsb = -1;
640 slice.i_delta_pic_order_cnt_bottom = -1;
641 slice.i_delta_pic_order_cnt0 = 0;
642 slice.i_delta_pic_order_cnt1 = 0;
643 if( p_sys->i_pic_order_cnt_type == 0 )
645 slice.i_pic_order_cnt_lsb = bs_read( &s, p_sys->i_log2_max_pic_order_cnt_lsb + 4 );
646 if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
647 slice.i_delta_pic_order_cnt_bottom = bs_read_se( &s );
649 else if( p_sys->i_pic_order_cnt_type == 1 && !p_sys->i_delta_pic_order_always_zero_flag )
651 slice.i_delta_pic_order_cnt0 = bs_read_se( &s );
652 if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
653 slice.i_delta_pic_order_cnt1 = bs_read_se( &s );
656 /* Detection of the first VCL NAL unit of a primary coded picture
659 if( slice.i_frame_num != p_sys->slice.i_frame_num ||
660 slice.i_pic_parameter_set_id != p_sys->slice.i_pic_parameter_set_id ||
661 slice.i_field_pic_flag != p_sys->slice.i_field_pic_flag ||
662 slice.i_nal_ref_idc != p_sys->slice.i_nal_ref_idc )
664 if( slice.i_bottom_field_flag != -1 && p_sys->slice.i_bottom_field_flag != -1 && slice.i_bottom_field_flag != p_sys->slice.i_bottom_field_flag )
666 if( p_sys->i_pic_order_cnt_type == 0 &&
667 ( slice.i_pic_order_cnt_lsb != p_sys->slice.i_pic_order_cnt_lsb ||
668 slice.i_delta_pic_order_cnt_bottom != p_sys->slice.i_delta_pic_order_cnt_bottom ) )
670 else if( p_sys->i_pic_order_cnt_type == 1 &&
671 ( slice.i_delta_pic_order_cnt0 != p_sys->slice.i_delta_pic_order_cnt0 ||
672 slice.i_delta_pic_order_cnt1 != p_sys->slice.i_delta_pic_order_cnt1 ) )
674 if( ( slice.i_nal_type == NAL_SLICE_IDR || p_sys->slice.i_nal_type == NAL_SLICE_IDR ) &&
675 ( slice.i_nal_type != p_sys->slice.i_nal_type || slice.i_idr_pic_id != p_sys->slice.i_idr_pic_id ) )
679 p_sys->slice = slice;
681 if( b_pic && p_sys->b_slice )
684 p_sys->b_slice = VLC_TRUE;
688 else if( i_nal_type == NAL_SPS )
695 if( !p_sys->b_sps ) msg_Dbg( p_dec, "found NAL_SPS" );
697 p_sys->b_sps = VLC_TRUE;
699 nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
700 p_frag->i_buffer - 5 );
702 bs_init( &s, dec, i_dec );
703 /* Skip profile(8), constraint_set012, reserver(5), level(8) */
704 bs_skip( &s, 8 + 1+1+1 + 5 + 8 );
707 /* Skip i_log2_max_frame_num */
708 p_sys->i_log2_max_frame_num = bs_read_ue( &s );
709 if( p_sys->i_log2_max_frame_num > 12)
710 p_sys->i_log2_max_frame_num = 12;
712 p_sys->i_pic_order_cnt_type = bs_read_ue( &s );
713 if( p_sys->i_pic_order_cnt_type == 0 )
715 /* skip i_log2_max_poc_lsb */
716 p_sys->i_log2_max_pic_order_cnt_lsb = bs_read_ue( &s );
717 if( p_sys->i_log2_max_pic_order_cnt_lsb > 12 )
718 p_sys->i_log2_max_pic_order_cnt_lsb = 12;
720 else if( p_sys->i_pic_order_cnt_type == 1 )
723 /* skip b_delta_pic_order_always_zero */
724 p_sys->i_delta_pic_order_always_zero_flag = bs_read( &s, 1 );
725 /* skip i_offset_for_non_ref_pic */
727 /* skip i_offset_for_top_to_bottom_field */
729 /* read i_num_ref_frames_in_poc_cycle */
730 i_cycle = bs_read_ue( &s );
731 if( i_cycle > 256 ) i_cycle = 256;
734 /* skip i_offset_for_ref_frame */
738 /* i_num_ref_frames */
740 /* b_gaps_in_frame_num_value_allowed */
744 p_dec->fmt_out.video.i_width = 16 * ( bs_read_ue( &s ) + 1 );
745 p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );
747 /* b_frame_mbs_only */
748 p_sys->b_frame_mbs_only = bs_read( &s, 1 );
749 if( p_sys->b_frame_mbs_only == 0 )
753 /* b_direct8x8_inference */
757 i_tmp = bs_read( &s, 1 );
771 i_tmp = bs_read( &s, 1 );
774 /* read the aspect ratio part if any FIXME check it */
775 i_tmp = bs_read( &s, 1 );
778 static const struct { int w, h; } sar[14] =
780 { 0, 0 }, { 1, 1 }, { 12, 11 }, { 10, 11 },
781 { 16, 11 }, { 40, 33 }, { 24, 11 }, { 20, 11 },
782 { 32, 11 }, { 80, 33 }, { 18, 11 }, { 15, 11 },
783 { 64, 33 }, { 160,99 },
785 int i_sar = bs_read( &s, 8 );
795 w = bs_read( &s, 16 );
796 h = bs_read( &s, 16 );
799 p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR * w /
800 h * p_dec->fmt_out.video.i_width /
801 p_dec->fmt_out.video.i_height;
803 p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR;
809 if( p_sys->b_slice ) OUTPUT;
811 /* We have a new SPS */
812 if( p_sys->p_sps ) block_Release( p_sys->p_sps );
813 p_sys->p_sps = p_frag;
815 /* Do not append the SPS because we will insert it on keyframes */
818 else if( i_nal_type == NAL_PPS )
822 bs_init( &s, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
823 bs_read_ue( &s ); // pps id
824 bs_read_ue( &s ); // sps id
825 bs_skip( &s, 1 ); // entropy coding mode flag
826 p_sys->i_pic_order_present_flag = bs_read( &s, 1 );
828 if( !p_sys->b_pps ) msg_Dbg( p_dec, "found NAL_PPS" );
829 p_sys->b_pps = VLC_TRUE;
833 if( p_sys->b_slice ) OUTPUT;
835 /* We have a new PPS */
836 if( p_sys->p_pps ) block_Release( p_sys->p_pps );
837 p_sys->p_pps = p_frag;
839 /* Do not append the PPS because we will insert it on keyframes */
842 else if( i_nal_type == NAL_AU_DELIMITER ||
843 i_nal_type == NAL_SEI ||
844 ( i_nal_type >= 13 && i_nal_type <= 18 ) )
846 if( p_sys->b_slice ) OUTPUT;
851 /* Append the block */
852 block_ChainAppend( &p_sys->p_frame, p_frag );