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 if( p_dec->fmt_out.p_extra )
254 memcpy( (uint8_t*)p_dec->fmt_out.p_extra, p_sys->p_sps->p_buffer, p_sys->p_sps->i_buffer);
255 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);
256 p_sys->b_header = VLC_TRUE;
258 else p_dec->fmt_out.i_extra = 0;
261 p_dec->pf_packetize = PacketizeAVC1;
265 /* This type of stream contains data with 3 of 4 byte startcodes
266 * The fmt_in.p_extra MAY contain SPS/PPS with 4 byte startcodes
267 * The fmt_out.p_extra should be the same */
270 p_dec->pf_packetize = Packetize;
273 if( p_dec->fmt_in.i_extra > 0 )
275 block_t *p_init = block_New( p_dec, p_dec->fmt_in.i_extra );
278 memcpy( p_init->p_buffer, p_dec->fmt_in.p_extra,
279 p_dec->fmt_in.i_extra );
281 while( ( p_pic = Packetize( p_dec, &p_init ) ) )
283 /* Should not occur because we should only receive SPS/PPS */
284 block_Release( p_pic );
292 /*****************************************************************************
293 * Close: clean up the packetizer
294 *****************************************************************************/
295 static void Close( vlc_object_t *p_this )
297 decoder_t *p_dec = (decoder_t*)p_this;
298 decoder_sys_t *p_sys = p_dec->p_sys;
300 if( p_sys->p_frame ) block_ChainRelease( p_sys->p_frame );
301 if( p_sys->p_sps ) block_Release( p_sys->p_sps );
302 if( p_sys->p_pps ) block_Release( p_sys->p_pps );
303 block_BytestreamRelease( &p_sys->bytestream );
307 /****************************************************************************
308 * Packetize: the whole thing
309 * Search for the startcodes 3 or more bytes
310 * Feed ParseNALBlock ALWAYS with 4 byte startcode prepended NALs
311 ****************************************************************************/
312 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
314 decoder_sys_t *p_sys = p_dec->p_sys;
317 if( !pp_block || !*pp_block )
320 if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
322 if( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED )
324 p_sys->i_state = STATE_NOSYNC;
325 block_BytestreamFlush( &p_sys->bytestream );
328 block_ChainRelease( p_sys->p_frame );
329 p_sys->p_frame = NULL;
330 p_sys->slice.i_frame_type = 0;
331 p_sys->b_slice = VLC_FALSE;
333 block_Release( *pp_block );
337 block_BytestreamPush( &p_sys->bytestream, *pp_block );
341 switch( p_sys->i_state )
344 /* Skip until 3 byte startcode 0 0 1 */
345 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
346 &p_sys->i_offset, p_sys->startcode+1, 3 ) == VLC_SUCCESS)
348 p_sys->i_state = STATE_NEXT_SYNC;
351 if( p_sys->i_offset )
354 block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
356 block_BytestreamFlush( &p_sys->bytestream );
359 if( p_sys->i_state != STATE_NEXT_SYNC )
365 p_sys->i_offset = 1; /* To find next startcode */
367 case STATE_NEXT_SYNC:
368 /* Find the next 3 byte startcode 0 0 1*/
369 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
370 &p_sys->i_offset, p_sys->startcode+1, 3 ) != VLC_SUCCESS)
376 /* Get the new fragment and set the pts/dts */
377 p_pic = block_New( p_dec, p_sys->i_offset +1 );
378 p_pic->i_pts = p_sys->bytestream.p_block->i_pts;
379 p_pic->i_dts = p_sys->bytestream.p_block->i_dts;
380 /* Force 4 byte startcode 0 0 0 1 */
381 p_pic->p_buffer[0] = 0;
383 block_GetBytes( &p_sys->bytestream, &p_pic->p_buffer[1],
386 /* Remove trailing 0 bytes */
387 while( p_pic->i_buffer && (!p_pic->p_buffer[p_pic->i_buffer-1] ) )
392 if( !( p_pic = ParseNALBlock( p_dec, p_pic ) ) )
394 p_sys->i_state = STATE_NOSYNC;
398 msg_Dbg( p_dec, "pts="I64Fd" dts="I64Fd,
399 p_pic->i_pts, p_pic->i_dts );
402 /* So p_block doesn't get re-added several times */
403 *pp_block = block_BytestreamPop( &p_sys->bytestream );
405 p_sys->i_state = STATE_NOSYNC;
412 /****************************************************************************
413 * PacketizeAVC1: Takes VCL blocks of data and creates annexe B type NAL stream
414 * Will always use 4 byte 0 0 0 1 startcodes
415 * Will prepend a SPS and PPS before each keyframe
416 ****************************************************************************/
417 static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
419 decoder_sys_t *p_sys = p_dec->p_sys;
421 block_t *p_ret = NULL;
424 if( !pp_block || !*pp_block )
426 if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
428 block_Release( *pp_block );
435 for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
441 for( i = 0; i < p_sys->i_avcC_length_size; i++ )
443 i_size = (i_size << 8) | (*p++);
448 block_t *p_part = nal_get_annexeb( p_dec, p, i_size );
450 p_part->i_dts = p_block->i_dts;
451 p_part->i_pts = p_block->i_pts;
454 if( ( p_pic = ParseNALBlock( p_dec, p_part ) ) )
456 block_ChainAppend( &p_ret, p_pic );
461 block_Release( p_block );
466 static block_t *nal_get_annexeb( decoder_t *p_dec, uint8_t *p, int i_size )
470 p_nal = block_New( p_dec, 4 + i_size );
473 p_nal->p_buffer[0] = 0x00;
474 p_nal->p_buffer[1] = 0x00;
475 p_nal->p_buffer[2] = 0x00;
476 p_nal->p_buffer[3] = 0x01;
479 memcpy( &p_nal->p_buffer[4], p, i_size );
484 static void nal_get_decoded( uint8_t **pp_ret, int *pi_ret,
485 uint8_t *src, int i_src )
487 uint8_t *end = &src[i_src];
488 uint8_t *dst = malloc( i_src );
496 if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
508 *pi_ret = dst - *pp_ret;
511 static inline int bs_read_ue( bs_t *s )
515 while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
519 return( ( 1 << i) - 1 + bs_read( s, i ) );
522 static inline int bs_read_se( bs_t *s )
524 int val = bs_read_ue( s );
526 return val&0x01 ? (val+1)/2 : -(val/2);
529 /*****************************************************************************
530 * ParseNALBlock: parses annexB type NALs
531 * All p_frag blocks are required to start with 0 0 0 1 4-byte startcode
532 *****************************************************************************/
533 static block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
535 decoder_sys_t *p_sys = p_dec->p_sys;
536 block_t *p_pic = NULL;
538 const int i_nal_ref_idc = (p_frag->p_buffer[4] >> 5)&0x03;
539 const int i_nal_type = p_frag->p_buffer[4]&0x1f;
543 if( !p_sys->b_header && p_sys->slice.i_frame_type != BLOCK_FLAG_TYPE_I) \
546 if( p_sys->slice.i_frame_type == BLOCK_FLAG_TYPE_I && p_sys->p_sps && p_sys->p_pps ) \
548 block_t *p_sps = block_Duplicate( p_sys->p_sps ); \
549 block_t *p_pps = block_Duplicate( p_sys->p_pps ); \
550 p_sps->i_dts = p_sys->p_frame->i_dts; \
551 p_sps->i_pts = p_sys->p_frame->i_pts; \
552 block_ChainAppend( &p_sps, p_pps ); \
553 block_ChainAppend( &p_sps, p_sys->p_frame ); \
554 p_sys->b_header = VLC_TRUE; \
555 p_pic = block_ChainGather( p_sps ); \
557 p_pic = block_ChainGather( p_sys->p_frame ); \
559 p_pic->i_length = 0; /* FIXME */ \
560 p_pic->i_flags |= p_sys->slice.i_frame_type; \
562 p_sys->slice.i_frame_type = 0; \
563 p_sys->p_frame = NULL; \
564 p_sys->b_slice = VLC_FALSE; \
567 if( p_sys->b_slice && ( !p_sys->b_sps || !p_sys->b_pps ) )
569 block_ChainRelease( p_sys->p_frame );
570 msg_Warn( p_dec, "waiting for SPS/PPS" );
573 p_sys->slice.i_frame_type = 0;
574 p_sys->p_frame = NULL;
575 p_sys->b_slice = VLC_FALSE;
578 if( ( !p_sys->b_sps || !p_sys->b_pps ) &&
579 i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
581 p_sys->b_slice = VLC_TRUE;
582 /* Fragment will be discarded later on */
584 else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
587 int i_dec = 0, i_first_mb, i_slice_type;
592 /* do not convert the whole frame */
593 nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
594 __MIN( p_frag->i_buffer - 5, 60 ) );
595 bs_init( &s, dec, i_dec );
597 /* first_mb_in_slice */
598 i_first_mb = bs_read_ue( &s );
601 switch( (i_slice_type = bs_read_ue( &s )) )
604 slice.i_frame_type = BLOCK_FLAG_TYPE_P;
607 slice.i_frame_type = BLOCK_FLAG_TYPE_B;
610 slice.i_frame_type = BLOCK_FLAG_TYPE_I;
612 case 3: case 8: /* SP */
613 slice.i_frame_type = BLOCK_FLAG_TYPE_P;
616 slice.i_frame_type = BLOCK_FLAG_TYPE_I;
619 slice.i_frame_type = 0;
624 slice.i_nal_type = i_nal_type;
625 slice.i_nal_ref_idc = i_nal_ref_idc;
627 slice.i_pic_parameter_set_id = bs_read_ue( &s );
628 slice.i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );
630 slice.i_field_pic_flag = 0;
631 slice.i_bottom_field_flag = -1;
632 if( !p_sys->b_frame_mbs_only )
635 slice.i_field_pic_flag = bs_read( &s, 1 );
636 if( slice.i_field_pic_flag )
637 slice.i_bottom_field_flag = bs_read( &s, 1 );
640 slice.i_idr_pic_id = p_sys->slice.i_idr_pic_id;
641 if( slice.i_nal_type == NAL_SLICE_IDR )
642 slice.i_idr_pic_id = bs_read_ue( &s );
644 slice.i_pic_order_cnt_lsb = -1;
645 slice.i_delta_pic_order_cnt_bottom = -1;
646 slice.i_delta_pic_order_cnt0 = 0;
647 slice.i_delta_pic_order_cnt1 = 0;
648 if( p_sys->i_pic_order_cnt_type == 0 )
650 slice.i_pic_order_cnt_lsb = bs_read( &s, p_sys->i_log2_max_pic_order_cnt_lsb + 4 );
651 if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
652 slice.i_delta_pic_order_cnt_bottom = bs_read_se( &s );
654 else if( (p_sys->i_pic_order_cnt_type == 1) &&
655 (!p_sys->i_delta_pic_order_always_zero_flag) )
657 slice.i_delta_pic_order_cnt0 = bs_read_se( &s );
658 if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
659 slice.i_delta_pic_order_cnt1 = bs_read_se( &s );
662 /* Detection of the first VCL NAL unit of a primary coded picture
665 if( slice.i_frame_num != p_sys->slice.i_frame_num ||
666 slice.i_pic_parameter_set_id != p_sys->slice.i_pic_parameter_set_id ||
667 slice.i_field_pic_flag != p_sys->slice.i_field_pic_flag ||
668 slice.i_nal_ref_idc != p_sys->slice.i_nal_ref_idc )
670 if( (slice.i_bottom_field_flag != -1) &&
671 (p_sys->slice.i_bottom_field_flag != -1) &&
672 (slice.i_bottom_field_flag != p_sys->slice.i_bottom_field_flag) )
674 if( p_sys->i_pic_order_cnt_type == 0 &&
675 ( slice.i_pic_order_cnt_lsb != p_sys->slice.i_pic_order_cnt_lsb ||
676 slice.i_delta_pic_order_cnt_bottom != p_sys->slice.i_delta_pic_order_cnt_bottom ) )
678 else if( p_sys->i_pic_order_cnt_type == 1 &&
679 ( slice.i_delta_pic_order_cnt0 != p_sys->slice.i_delta_pic_order_cnt0 ||
680 slice.i_delta_pic_order_cnt1 != p_sys->slice.i_delta_pic_order_cnt1 ) )
682 if( ( slice.i_nal_type == NAL_SLICE_IDR || p_sys->slice.i_nal_type == NAL_SLICE_IDR ) &&
683 ( slice.i_nal_type != p_sys->slice.i_nal_type || slice.i_idr_pic_id != p_sys->slice.i_idr_pic_id ) )
687 p_sys->slice = slice;
689 if( b_pic && p_sys->b_slice )
692 p_sys->b_slice = VLC_TRUE;
696 else if( i_nal_type == NAL_SPS )
703 if( !p_sys->b_sps ) msg_Dbg( p_dec, "found NAL_SPS" );
705 p_sys->b_sps = VLC_TRUE;
707 nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
708 p_frag->i_buffer - 5 );
710 bs_init( &s, dec, i_dec );
711 /* Skip profile(8), constraint_set012, reserver(5), level(8) */
712 bs_skip( &s, 8 + 1+1+1 + 5 + 8 );
715 /* Skip i_log2_max_frame_num */
716 p_sys->i_log2_max_frame_num = bs_read_ue( &s );
717 if( p_sys->i_log2_max_frame_num > 12)
718 p_sys->i_log2_max_frame_num = 12;
720 p_sys->i_pic_order_cnt_type = bs_read_ue( &s );
721 if( p_sys->i_pic_order_cnt_type == 0 )
723 /* skip i_log2_max_poc_lsb */
724 p_sys->i_log2_max_pic_order_cnt_lsb = bs_read_ue( &s );
725 if( p_sys->i_log2_max_pic_order_cnt_lsb > 12 )
726 p_sys->i_log2_max_pic_order_cnt_lsb = 12;
728 else if( p_sys->i_pic_order_cnt_type == 1 )
731 /* skip b_delta_pic_order_always_zero */
732 p_sys->i_delta_pic_order_always_zero_flag = bs_read( &s, 1 );
733 /* skip i_offset_for_non_ref_pic */
735 /* skip i_offset_for_top_to_bottom_field */
737 /* read i_num_ref_frames_in_poc_cycle */
738 i_cycle = bs_read_ue( &s );
739 if( i_cycle > 256 ) i_cycle = 256;
742 /* skip i_offset_for_ref_frame */
746 /* i_num_ref_frames */
748 /* b_gaps_in_frame_num_value_allowed */
752 p_dec->fmt_out.video.i_width = 16 * ( bs_read_ue( &s ) + 1 );
753 p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );
755 /* b_frame_mbs_only */
756 p_sys->b_frame_mbs_only = bs_read( &s, 1 );
757 if( p_sys->b_frame_mbs_only == 0 )
761 /* b_direct8x8_inference */
765 i_tmp = bs_read( &s, 1 );
779 i_tmp = bs_read( &s, 1 );
782 /* read the aspect ratio part if any FIXME check it */
783 i_tmp = bs_read( &s, 1 );
786 static const struct { int w, h; } sar[14] =
788 { 0, 0 }, { 1, 1 }, { 12, 11 }, { 10, 11 },
789 { 16, 11 }, { 40, 33 }, { 24, 11 }, { 20, 11 },
790 { 32, 11 }, { 80, 33 }, { 18, 11 }, { 15, 11 },
791 { 64, 33 }, { 160,99 },
793 int i_sar = bs_read( &s, 8 );
803 w = bs_read( &s, 16 );
804 h = bs_read( &s, 16 );
807 p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR * w /
808 h * p_dec->fmt_out.video.i_width /
809 p_dec->fmt_out.video.i_height;
811 p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR;
817 if( p_sys->b_slice ) OUTPUT;
819 /* We have a new SPS */
820 if( p_sys->p_sps ) block_Release( p_sys->p_sps );
821 p_sys->p_sps = p_frag;
823 /* Do not append the SPS because we will insert it on keyframes */
826 else if( i_nal_type == NAL_PPS )
830 bs_init( &s, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
831 bs_read_ue( &s ); // pps id
832 bs_read_ue( &s ); // sps id
833 bs_skip( &s, 1 ); // entropy coding mode flag
834 p_sys->i_pic_order_present_flag = bs_read( &s, 1 );
836 if( !p_sys->b_pps ) msg_Dbg( p_dec, "found NAL_PPS" );
837 p_sys->b_pps = VLC_TRUE;
841 if( p_sys->b_slice ) OUTPUT;
843 /* We have a new PPS */
844 if( p_sys->p_pps ) block_Release( p_sys->p_pps );
845 p_sys->p_pps = p_frag;
847 /* Do not append the PPS because we will insert it on keyframes */
850 else if( i_nal_type == NAL_AU_DELIMITER ||
851 i_nal_type == NAL_SEI ||
852 ( i_nal_type >= 13 && i_nal_type <= 18 ) )
854 if( p_sys->b_slice ) OUTPUT;
859 /* Append the block */
860 block_ChainAppend( &p_sys->p_frame, p_frag );