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 *****************************************************************************/
35 #include <vlc_common.h>
36 #include <vlc_plugin.h>
38 #include <vlc_codec.h>
39 #include <vlc_block.h>
41 #include "vlc_block_helper.h"
43 #include "../codec/cc.h"
44 #include "packetizer_helper.h"
46 /*****************************************************************************
48 *****************************************************************************/
49 static int Open ( vlc_object_t * );
50 static void Close( vlc_object_t * );
53 set_category( CAT_SOUT )
54 set_subcategory( SUBCAT_SOUT_PACKETIZER )
55 set_description( N_("H.264 video packetizer") )
56 set_capability( "packetizer", 50 )
57 set_callbacks( Open, Close )
61 /****************************************************************************
63 ****************************************************************************/
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;
90 packetizer_t packetizer;
99 block_t *pp_sps[SPS_MAX];
100 block_t *pp_pps[PPS_MAX];
103 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 */
138 NAL_SLICE_IDR = 5, /* ref_idc != 0 */
139 NAL_SEI = 6, /* ref_idc == 0 */
143 /* ref_idc == 0 for 6,9,10,11,12 */
148 NAL_PRIORITY_DISPOSABLE = 0,
149 NAL_PRIORITY_LOW = 1,
150 NAL_PRIORITY_HIGH = 2,
151 NAL_PRIORITY_HIGHEST = 3,
154 static block_t *Packetize( decoder_t *, block_t ** );
155 static block_t *PacketizeAVC1( decoder_t *, block_t ** );
156 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] );
158 static void PacketizeReset( void *p_private, bool b_broken );
159 static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t * );
160 static int PacketizeValidate( void *p_private, block_t * );
162 static block_t *ParseNALBlock( decoder_t *, bool *pb_used_ts, block_t * );
163 static block_t *CreateAnnexbNAL( decoder_t *, const uint8_t *p, int );
165 static block_t *OutputPicture( decoder_t *p_dec );
166 static void PutSPS( decoder_t *p_dec, block_t *p_frag );
167 static void PutPPS( decoder_t *p_dec, block_t *p_frag );
168 static void ParseSlice( decoder_t *p_dec, bool *pb_new_picture, slice_t *p_slice,
169 int i_nal_ref_idc, int i_nal_type, const block_t *p_frag );
170 static void ParseSei( decoder_t *, block_t * );
173 static const uint8_t p_h264_startcode[3] = { 0x00, 0x00, 0x01 };
175 /*****************************************************************************
176 * Open: probe the packetizer and return score
177 * When opening after demux, the packetizer is only loaded AFTER the decoder
178 * That means that what you set in fmt_out is ignored by the decoder in this special case
179 *****************************************************************************/
180 static int Open( vlc_object_t *p_this )
182 decoder_t *p_dec = (decoder_t*)p_this;
183 decoder_sys_t *p_sys;
186 if( p_dec->fmt_in.i_codec != VLC_CODEC_H264 &&
187 p_dec->fmt_in.i_codec != VLC_FOURCC( 'H', '2', '6', '4') &&
188 p_dec->fmt_in.i_codec != VLC_FOURCC( 'V', 'S', 'S', 'H') &&
189 p_dec->fmt_in.i_codec != VLC_FOURCC( 'v', 's', 's', 'h') &&
190 p_dec->fmt_in.i_codec != VLC_FOURCC( 'D', 'A', 'V', 'C') &&
191 p_dec->fmt_in.i_codec != VLC_FOURCC( 'x', '2', '6', '4') &&
192 p_dec->fmt_in.i_codec != VLC_FOURCC( 'X', '2', '6', '4') &&
193 ( p_dec->fmt_in.i_codec != VLC_FOURCC( 'a', 'v', 'c', '1') ||
194 p_dec->fmt_in.i_extra < 7 ) )
199 /* Allocate the memory needed to store the decoder's structure */
200 if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
205 packetizer_Init( &p_sys->packetizer,
206 p_h264_startcode, sizeof(p_h264_startcode),
208 PacketizeReset, PacketizeParse, PacketizeValidate, p_dec );
210 p_sys->b_slice = false;
211 p_sys->p_frame = NULL;
212 p_sys->b_header= false;
213 p_sys->b_sps = false;
214 p_sys->b_pps = false;
215 for( i = 0; i < SPS_MAX; i++ )
216 p_sys->pp_sps[i] = NULL;
217 for( i = 0; i < PPS_MAX; i++ )
218 p_sys->pp_pps[i] = NULL;
220 p_sys->slice.i_nal_type = -1;
221 p_sys->slice.i_nal_ref_idc = -1;
222 p_sys->slice.i_idr_pic_id = -1;
223 p_sys->slice.i_frame_num = -1;
224 p_sys->slice.i_frame_type = 0;
225 p_sys->slice.i_pic_parameter_set_id = -1;
226 p_sys->slice.i_field_pic_flag = 0;
227 p_sys->slice.i_bottom_field_flag = -1;
228 p_sys->slice.i_pic_order_cnt_lsb = -1;
229 p_sys->slice.i_delta_pic_order_cnt_bottom = -1;
231 p_sys->i_frame_dts = -1;
232 p_sys->i_frame_pts = -1;
234 /* Setup properties */
235 es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
236 p_dec->fmt_out.i_codec = VLC_CODEC_H264;
238 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
240 /* This type of stream is produced by mp4 and matroska
241 * when we want to store it in another streamformat, you need to convert
242 * The fmt_in.p_extra should ALWAYS contain the avcC
243 * The fmt_out.p_extra should contain all the SPS and PPS with 4 byte startcodes */
244 uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
250 p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
254 for( i = 0; i < i_sps; i++ )
256 uint16_t i_length = GetWBE( p ); p += 2;
258 (uint8_t*)p_dec->fmt_in.p_extra + p_dec->fmt_in.i_extra - p )
262 block_t *p_sps = CreateAnnexbNAL( p_dec, p, i_length );
265 ParseNALBlock( p_dec, &b_dummy, p_sps );
270 for( i = 0; i < i_pps; i++ )
272 uint16_t i_length = GetWBE( p ); p += 2;
274 (uint8_t*)p_dec->fmt_in.p_extra + p_dec->fmt_in.i_extra - p )
278 block_t *p_pps = CreateAnnexbNAL( p_dec, p, i_length );
281 ParseNALBlock( p_dec, &b_dummy, p_pps );
284 msg_Dbg( p_dec, "avcC length size=%d, sps=%d, pps=%d",
285 p_sys->i_avcC_length_size, i_sps, i_pps );
287 if( !p_sys->b_sps || !p_sys->b_pps )
290 /* FIXME: FFMPEG isn't happy at all if you leave this */
291 if( p_dec->fmt_out.i_extra > 0 )
292 free( p_dec->fmt_out.p_extra );
293 p_dec->fmt_out.i_extra = 0;
294 p_dec->fmt_out.p_extra = NULL;
296 /* Set the new extradata */
297 for( i = 0; i < SPS_MAX; i++ )
299 if( p_sys->pp_sps[i] )
300 p_dec->fmt_out.i_extra += p_sys->pp_sps[i]->i_buffer;
302 for( i = 0; i < PPS_MAX; i++ )
304 if( p_sys->pp_pps[i] )
305 p_dec->fmt_out.i_extra += p_sys->pp_pps[i]->i_buffer;
307 p_dec->fmt_out.p_extra = malloc( p_dec->fmt_out.i_extra );
308 if( p_dec->fmt_out.p_extra )
310 uint8_t *p_dst = p_dec->fmt_out.p_extra;
312 for( i = 0; i < SPS_MAX; i++ )
314 if( p_sys->pp_sps[i] )
316 memcpy( p_dst, p_sys->pp_sps[i]->p_buffer, p_sys->pp_sps[i]->i_buffer );
317 p_dst += p_sys->pp_sps[i]->i_buffer;
320 for( i = 0; i < PPS_MAX; i++ )
322 if( p_sys->pp_pps[i] )
324 memcpy( p_dst, p_sys->pp_pps[i]->p_buffer, p_sys->pp_pps[i]->i_buffer );
325 p_dst += p_sys->pp_pps[i]->i_buffer;
328 p_sys->b_header = true;
332 p_dec->fmt_out.i_extra = 0;
336 p_dec->pf_packetize = PacketizeAVC1;
341 /* This type of stream contains data with 3 of 4 byte startcodes
342 * The fmt_in.p_extra MAY contain SPS/PPS with 4 byte startcodes
343 * The fmt_out.p_extra should be the same */
346 p_dec->pf_packetize = Packetize;
347 p_dec->pf_get_cc = GetCc;
352 p_sys->i_cc_flags = 0;
353 cc_Init( &p_sys->cc );
354 cc_Init( &p_sys->cc_next );
357 if( p_dec->fmt_in.i_extra > 0 )
358 packetizer_Header( &p_sys->packetizer,
359 p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra );
365 /*****************************************************************************
366 * Close: clean up the packetizer
367 *****************************************************************************/
368 static void Close( vlc_object_t *p_this )
370 decoder_t *p_dec = (decoder_t*)p_this;
371 decoder_sys_t *p_sys = p_dec->p_sys;
375 block_ChainRelease( p_sys->p_frame );
376 for( i = 0; i < SPS_MAX; i++ )
378 if( p_sys->pp_sps[i] )
379 block_Release( p_sys->pp_sps[i] );
381 for( i = 0; i < PPS_MAX; i++ )
383 if( p_sys->pp_pps[i] )
384 block_Release( p_sys->pp_pps[i] );
386 packetizer_Clean( &p_sys->packetizer );
388 if( p_dec->pf_get_cc )
390 cc_Exit( &p_sys->cc_next );
391 cc_Exit( &p_sys->cc );
397 /****************************************************************************
398 * Packetize: the whole thing
399 * Search for the startcodes 3 or more bytes
400 * Feed ParseNALBlock ALWAYS with 4 byte startcode prepended NALs
401 ****************************************************************************/
402 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
404 decoder_sys_t *p_sys = p_dec->p_sys;
406 return packetizer_Packetize( &p_sys->packetizer, pp_block );
409 /****************************************************************************
410 * PacketizeAVC1: Takes VCL blocks of data and creates annexe B type NAL stream
411 * Will always use 4 byte 0 0 0 1 startcodes
412 * Will prepend a SPS and PPS before each keyframe
413 ****************************************************************************/
414 static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
416 decoder_sys_t *p_sys = p_dec->p_sys;
418 block_t *p_ret = NULL;
421 if( !pp_block || !*pp_block )
423 if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
425 block_Release( *pp_block );
432 for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
439 for( i = 0; i < p_sys->i_avcC_length_size; i++ )
441 i_size = (i_size << 8) | (*p++);
445 i_size > ( p_block->p_buffer + p_block->i_buffer - p ) )
447 msg_Err( p_dec, "Broken frame : size %d is too big", i_size );
451 block_t *p_part = CreateAnnexbNAL( p_dec, p, i_size );
455 p_part->i_dts = p_block->i_dts;
456 p_part->i_pts = p_block->i_pts;
459 if( ( p_pic = ParseNALBlock( p_dec, &b_dummy, p_part ) ) )
461 block_ChainAppend( &p_ret, p_pic );
465 block_Release( p_block );
470 /*****************************************************************************
472 *****************************************************************************/
473 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] )
475 decoder_sys_t *p_sys = p_dec->p_sys;
478 for( int i = 0; i < 4; i++ )
479 pb_present[i] = p_sys->cc.pb_present[i];
481 if( p_sys->cc.i_data <= 0 )
484 p_cc = block_New( p_dec, p_sys->cc.i_data);
487 memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
489 p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
490 p_cc->i_flags = ( p_sys->cc.b_reorder ? p_sys->i_cc_flags : BLOCK_FLAG_TYPE_P ) & BLOCK_FLAG_TYPE_MASK;
492 cc_Flush( &p_sys->cc );
496 /****************************************************************************
498 ****************************************************************************/
499 static void PacketizeReset( void *p_private, bool b_broken )
501 decoder_t *p_dec = p_private;
502 decoder_sys_t *p_sys = p_dec->p_sys;
507 block_ChainRelease( p_sys->p_frame );
508 p_sys->p_frame = NULL;
509 p_sys->slice.i_frame_type = 0;
510 p_sys->b_slice = false;
512 p_sys->i_frame_pts = -1;
513 p_sys->i_frame_dts = -1;
515 static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t *p_block )
517 decoder_t *p_dec = p_private;
519 /* Remove trailing 0 bytes */
520 while( p_block->i_buffer && p_block->p_buffer[p_block->i_buffer-1] == 0x00 )
523 return ParseNALBlock( p_dec, pb_ts_used, p_block );
525 static int PacketizeValidate( void *p_private, block_t *p_au )
527 VLC_UNUSED(p_private);
532 static block_t *CreateAnnexbNAL( decoder_t *p_dec, const uint8_t *p, int i_size )
536 p_nal = block_New( p_dec, 4 + i_size );
537 if( !p_nal ) return NULL;
540 p_nal->p_buffer[0] = 0x00;
541 p_nal->p_buffer[1] = 0x00;
542 p_nal->p_buffer[2] = 0x00;
543 p_nal->p_buffer[3] = 0x01;
546 memcpy( &p_nal->p_buffer[4], p, i_size );
552 static void CreateDecodedNAL( uint8_t **pp_ret, int *pi_ret,
553 const uint8_t *src, int i_src )
555 const uint8_t *end = &src[i_src];
556 uint8_t *dst = malloc( i_src );
564 if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
576 *pi_ret = dst - *pp_ret;
579 static inline int bs_read_ue( bs_t *s )
583 while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
587 return( ( 1 << i) - 1 + bs_read( s, i ) );
590 static inline int bs_read_se( bs_t *s )
592 int val = bs_read_ue( s );
594 return val&0x01 ? (val+1)/2 : -(val/2);
597 /*****************************************************************************
598 * ParseNALBlock: parses annexB type NALs
599 * All p_frag blocks are required to start with 0 0 0 1 4-byte startcode
600 *****************************************************************************/
601 static block_t *ParseNALBlock( decoder_t *p_dec, bool *pb_used_ts, block_t *p_frag )
603 decoder_sys_t *p_sys = p_dec->p_sys;
604 block_t *p_pic = NULL;
606 const int i_nal_ref_idc = (p_frag->p_buffer[4] >> 5)&0x03;
607 const int i_nal_type = p_frag->p_buffer[4]&0x1f;
608 const mtime_t i_frag_dts = p_frag->i_dts;
609 const mtime_t i_frag_pts = p_frag->i_pts;
611 if( p_sys->b_slice && ( !p_sys->b_sps || !p_sys->b_pps ) )
613 block_ChainRelease( p_sys->p_frame );
614 msg_Warn( p_dec, "waiting for SPS/PPS" );
617 p_sys->slice.i_frame_type = 0;
618 p_sys->p_frame = NULL;
619 p_sys->b_slice = false;
620 cc_Flush( &p_sys->cc_next );
623 if( ( !p_sys->b_sps || !p_sys->b_pps ) &&
624 i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
626 p_sys->b_slice = true;
627 /* Fragment will be discarded later on */
629 else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
634 ParseSlice( p_dec, &b_new_picture, &slice, i_nal_ref_idc, i_nal_type, p_frag );
637 if( b_new_picture && p_sys->b_slice )
638 p_pic = OutputPicture( p_dec );
641 p_sys->slice = slice;
642 p_sys->b_slice = true;
644 else if( i_nal_type == NAL_SPS )
647 p_pic = OutputPicture( p_dec );
649 PutSPS( p_dec, p_frag );
651 /* Do not append the SPS because we will insert it on keyframes */
654 else if( i_nal_type == NAL_PPS )
657 p_pic = OutputPicture( p_dec );
659 PutPPS( p_dec, p_frag );
661 /* Do not append the PPS because we will insert it on keyframes */
664 else if( i_nal_type == NAL_AU_DELIMITER ||
665 i_nal_type == NAL_SEI ||
666 ( i_nal_type >= 13 && i_nal_type <= 18 ) )
669 p_pic = OutputPicture( p_dec );
671 /* Parse SEI for CC support */
672 if( i_nal_type == NAL_SEI )
673 ParseSei( p_dec, p_frag );
676 /* Append the block */
678 block_ChainAppend( &p_sys->p_frame, p_frag );
681 if( p_sys->i_frame_dts < 0 && p_sys->i_frame_pts < 0 )
683 p_sys->i_frame_dts = i_frag_dts;
684 p_sys->i_frame_pts = i_frag_pts;
690 static block_t *OutputPicture( decoder_t *p_dec )
692 decoder_sys_t *p_sys = p_dec->p_sys;
695 if( !p_sys->b_header && p_sys->slice.i_frame_type != BLOCK_FLAG_TYPE_I)
698 if( p_sys->slice.i_frame_type == BLOCK_FLAG_TYPE_I && p_sys->b_sps && p_sys->b_pps )
700 block_t *p_list = NULL;
703 for( i = 0; i < SPS_MAX; i++ )
705 if( p_sys->pp_sps[i] )
706 block_ChainAppend( &p_list, block_Duplicate( p_sys->pp_sps[i] ) );
708 for( i = 0; i < PPS_MAX; i++ )
710 if( p_sys->pp_pps[i] )
711 block_ChainAppend( &p_list, block_Duplicate( p_sys->pp_pps[i] ) );
714 p_sys->b_header = true;
716 block_ChainAppend( &p_list, p_sys->p_frame );
717 p_pic = block_ChainGather( p_list );
721 p_pic = block_ChainGather( p_sys->p_frame );
723 p_pic->i_dts = p_sys->i_frame_dts;
724 p_pic->i_pts = p_sys->i_frame_pts;
725 p_pic->i_length = 0; /* FIXME */
726 p_pic->i_flags |= p_sys->slice.i_frame_type;
728 p_sys->slice.i_frame_type = 0;
729 p_sys->p_frame = NULL;
730 p_sys->i_frame_dts = -1;
731 p_sys->i_frame_pts = -1;
732 p_sys->b_slice = false;
735 p_sys->i_cc_pts = p_pic->i_pts;
736 p_sys->i_cc_dts = p_pic->i_dts;
737 p_sys->i_cc_flags = p_pic->i_flags;
740 cc_data_t cc_tmp = p_sys->cc;
741 p_sys->cc = p_sys->cc_next;
742 p_sys->cc_next = cc_tmp;
744 cc_Flush( &p_sys->cc_next );
749 static void PutSPS( decoder_t *p_dec, block_t *p_frag )
751 decoder_sys_t *p_sys = p_dec->p_sys;
753 uint8_t *pb_dec = NULL;
759 CreateDecodedNAL( &pb_dec, &i_dec, &p_frag->p_buffer[5],
760 p_frag->i_buffer - 5 );
762 bs_init( &s, pb_dec, i_dec );
763 int i_profile_idc = bs_read( &s, 8 );
764 /* Skip constraint_set0123, reserved(4), level(8) */
765 bs_skip( &s, 1+1+1+1 + 4 + 8 );
767 i_sps_id = bs_read_ue( &s );
768 if( i_sps_id >= SPS_MAX )
770 msg_Warn( p_dec, "invalid SPS (sps_id=%d)", i_sps_id );
772 block_Release( p_frag );
776 if( i_profile_idc == 100 || i_profile_idc == 110 ||
777 i_profile_idc == 122 || i_profile_idc == 244 ||
778 i_profile_idc == 44 || i_profile_idc == 83 ||
779 i_profile_idc == 86 )
781 /* chroma_format_idc */
782 const int i_chroma_format_idc = bs_read_ue( &s );
783 if( i_chroma_format_idc == 3 )
784 bs_skip( &s, 1 ); /* seperate_colour_plane_flag */
785 /* bit_depth_luma_minus8 */
787 /* bit_depth_chroma_minus8 */
789 /* qpprime_y_zero_transform_bypass_flag */
791 /* seq_scaling_matrix_present_flag */
792 i_tmp = bs_read( &s, 1 );
795 for( int i = 0; i < ((3 != i_chroma_format_idc) ? 8 : 12); i++ )
797 /* seq_scaling_list_present_flag[i] */
798 i_tmp = bs_read( &s, 1 );
801 const int i_size_of_scaling_list = (i < 6 ) ? 16 : 64;
802 /* scaling_list (...) */
805 for( int j = 0; j < i_size_of_scaling_list; j++ )
807 if( i_nextscale != 0 )
810 i_tmp = bs_read( &s, 1 );
811 i_nextscale = ( i_lastscale + i_tmp + 256 ) % 256;
812 /* useDefaultScalingMatrixFlag = ... */
815 i_lastscale = ( i_nextscale == 0 ) ? i_lastscale : i_nextscale;
821 /* Skip i_log2_max_frame_num */
822 p_sys->i_log2_max_frame_num = bs_read_ue( &s );
823 if( p_sys->i_log2_max_frame_num > 12)
824 p_sys->i_log2_max_frame_num = 12;
826 p_sys->i_pic_order_cnt_type = bs_read_ue( &s );
827 if( p_sys->i_pic_order_cnt_type == 0 )
829 /* skip i_log2_max_poc_lsb */
830 p_sys->i_log2_max_pic_order_cnt_lsb = bs_read_ue( &s );
831 if( p_sys->i_log2_max_pic_order_cnt_lsb > 12 )
832 p_sys->i_log2_max_pic_order_cnt_lsb = 12;
834 else if( p_sys->i_pic_order_cnt_type == 1 )
837 /* skip b_delta_pic_order_always_zero */
838 p_sys->i_delta_pic_order_always_zero_flag = bs_read( &s, 1 );
839 /* skip i_offset_for_non_ref_pic */
841 /* skip i_offset_for_top_to_bottom_field */
843 /* read i_num_ref_frames_in_poc_cycle */
844 i_cycle = bs_read_ue( &s );
845 if( i_cycle > 256 ) i_cycle = 256;
848 /* skip i_offset_for_ref_frame */
853 /* i_num_ref_frames */
855 /* b_gaps_in_frame_num_value_allowed */
859 p_dec->fmt_out.video.i_width = 16 * ( bs_read_ue( &s ) + 1 );
860 p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );
862 /* b_frame_mbs_only */
863 p_sys->b_frame_mbs_only = bs_read( &s, 1 );
864 if( p_sys->b_frame_mbs_only == 0 )
868 /* b_direct8x8_inference */
872 i_tmp = bs_read( &s, 1 );
886 i_tmp = bs_read( &s, 1 );
889 /* read the aspect ratio part if any */
890 i_tmp = bs_read( &s, 1 );
893 static const struct { int w, h; } sar[17] =
895 { 0, 0 }, { 1, 1 }, { 12, 11 }, { 10, 11 },
896 { 16, 11 }, { 40, 33 }, { 24, 11 }, { 20, 11 },
897 { 32, 11 }, { 80, 33 }, { 18, 11 }, { 15, 11 },
898 { 64, 33 }, { 160,99 }, { 4, 3 }, { 3, 2 },
901 int i_sar = bs_read( &s, 8 );
909 else if( i_sar == 255 )
911 w = bs_read( &s, 16 );
912 h = bs_read( &s, 16 );
921 p_dec->fmt_out.video.i_aspect = (int64_t)VOUT_ASPECT_FACTOR *
922 ( w * p_dec->fmt_out.video.i_width ) /
923 ( h * p_dec->fmt_out.video.i_height);
925 p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR;
931 /* We have a new SPS */
933 msg_Dbg( p_dec, "found NAL_SPS (sps_id=%d)", i_sps_id );
936 if( p_sys->pp_sps[i_sps_id] )
937 block_Release( p_sys->pp_sps[i_sps_id] );
938 p_sys->pp_sps[i_sps_id] = p_frag;
941 static void PutPPS( decoder_t *p_dec, block_t *p_frag )
943 decoder_sys_t *p_sys = p_dec->p_sys;
948 bs_init( &s, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
949 i_pps_id = bs_read_ue( &s ); // pps id
950 i_sps_id = bs_read_ue( &s ); // sps id
951 if( i_pps_id >= PPS_MAX || i_sps_id >= SPS_MAX )
953 msg_Warn( p_dec, "invalid PPS (pps_id=%d sps_id=%d)", i_pps_id, i_sps_id );
954 block_Release( p_frag );
957 bs_skip( &s, 1 ); // entropy coding mode flag
958 p_sys->i_pic_order_present_flag = bs_read( &s, 1 );
961 /* We have a new PPS */
963 msg_Dbg( p_dec, "found NAL_PPS (pps_id=%d sps_id=%d)", i_pps_id, i_sps_id );
966 if( p_sys->pp_pps[i_pps_id] )
967 block_Release( p_sys->pp_pps[i_pps_id] );
968 p_sys->pp_pps[i_pps_id] = p_frag;
971 static void ParseSlice( decoder_t *p_dec, bool *pb_new_picture, slice_t *p_slice,
972 int i_nal_ref_idc, int i_nal_type, const block_t *p_frag )
974 decoder_sys_t *p_sys = p_dec->p_sys;
977 int i_first_mb, i_slice_type;
981 /* do not convert the whole frame */
982 CreateDecodedNAL( &pb_dec, &i_dec, &p_frag->p_buffer[5],
983 __MIN( p_frag->i_buffer - 5, 60 ) );
984 bs_init( &s, pb_dec, i_dec );
986 /* first_mb_in_slice */
987 i_first_mb = bs_read_ue( &s );
990 switch( (i_slice_type = bs_read_ue( &s )) )
993 slice.i_frame_type = BLOCK_FLAG_TYPE_P;
996 slice.i_frame_type = BLOCK_FLAG_TYPE_B;
999 slice.i_frame_type = BLOCK_FLAG_TYPE_I;
1001 case 3: case 8: /* SP */
1002 slice.i_frame_type = BLOCK_FLAG_TYPE_P;
1005 slice.i_frame_type = BLOCK_FLAG_TYPE_I;
1008 slice.i_frame_type = 0;
1013 slice.i_nal_type = i_nal_type;
1014 slice.i_nal_ref_idc = i_nal_ref_idc;
1016 slice.i_pic_parameter_set_id = bs_read_ue( &s );
1017 slice.i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );
1019 slice.i_field_pic_flag = 0;
1020 slice.i_bottom_field_flag = -1;
1021 if( !p_sys->b_frame_mbs_only )
1023 /* field_pic_flag */
1024 slice.i_field_pic_flag = bs_read( &s, 1 );
1025 if( slice.i_field_pic_flag )
1026 slice.i_bottom_field_flag = bs_read( &s, 1 );
1029 slice.i_idr_pic_id = p_sys->slice.i_idr_pic_id;
1030 if( slice.i_nal_type == NAL_SLICE_IDR )
1031 slice.i_idr_pic_id = bs_read_ue( &s );
1033 slice.i_pic_order_cnt_lsb = -1;
1034 slice.i_delta_pic_order_cnt_bottom = -1;
1035 slice.i_delta_pic_order_cnt0 = 0;
1036 slice.i_delta_pic_order_cnt1 = 0;
1037 if( p_sys->i_pic_order_cnt_type == 0 )
1039 slice.i_pic_order_cnt_lsb = bs_read( &s, p_sys->i_log2_max_pic_order_cnt_lsb + 4 );
1040 if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
1041 slice.i_delta_pic_order_cnt_bottom = bs_read_se( &s );
1043 else if( (p_sys->i_pic_order_cnt_type == 1) &&
1044 (!p_sys->i_delta_pic_order_always_zero_flag) )
1046 slice.i_delta_pic_order_cnt0 = bs_read_se( &s );
1047 if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
1048 slice.i_delta_pic_order_cnt1 = bs_read_se( &s );
1052 /* Detection of the first VCL NAL unit of a primary coded picture
1053 * (cf. 7.4.1.2.4) */
1055 if( slice.i_frame_num != p_sys->slice.i_frame_num ||
1056 slice.i_pic_parameter_set_id != p_sys->slice.i_pic_parameter_set_id ||
1057 slice.i_field_pic_flag != p_sys->slice.i_field_pic_flag ||
1058 slice.i_nal_ref_idc != p_sys->slice.i_nal_ref_idc )
1060 if( (slice.i_bottom_field_flag != -1) &&
1061 (p_sys->slice.i_bottom_field_flag != -1) &&
1062 (slice.i_bottom_field_flag != p_sys->slice.i_bottom_field_flag) )
1064 if( p_sys->i_pic_order_cnt_type == 0 &&
1065 ( slice.i_pic_order_cnt_lsb != p_sys->slice.i_pic_order_cnt_lsb ||
1066 slice.i_delta_pic_order_cnt_bottom != p_sys->slice.i_delta_pic_order_cnt_bottom ) )
1068 else if( p_sys->i_pic_order_cnt_type == 1 &&
1069 ( slice.i_delta_pic_order_cnt0 != p_sys->slice.i_delta_pic_order_cnt0 ||
1070 slice.i_delta_pic_order_cnt1 != p_sys->slice.i_delta_pic_order_cnt1 ) )
1072 if( ( slice.i_nal_type == NAL_SLICE_IDR || p_sys->slice.i_nal_type == NAL_SLICE_IDR ) &&
1073 ( slice.i_nal_type != p_sys->slice.i_nal_type || slice.i_idr_pic_id != p_sys->slice.i_idr_pic_id ) )
1077 *pb_new_picture = b_pic;
1081 static void ParseSei( decoder_t *p_dec, block_t *p_frag )
1083 decoder_sys_t *p_sys = p_dec->p_sys;
1088 CreateDecodedNAL( &pb_dec, &i_dec, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
1092 /* The +1 is for rbsp trailing bits */
1093 for( int i_used = 0; i_used+1 < i_dec; )
1097 while( i_used+1 < i_dec )
1099 const int i_byte = pb_dec[i_used++];
1101 if( i_byte != 0xff )
1106 while( i_used+1 < i_dec )
1108 const int i_byte = pb_dec[i_used++];
1110 if( i_byte != 0xff )
1114 if( i_used + i_size + 1 > i_dec )
1117 /* Look for user_data_registered_itu_t_t35 */
1120 static const uint8_t p_dvb1_data_start_code[] = {
1123 0x47, 0x41, 0x39, 0x34
1125 const int i_t35 = i_size;
1126 const uint8_t *p_t35 = &pb_dec[i_used];
1128 /* Check for we have DVB1_data() */
1130 !memcmp( p_t35, p_dvb1_data_start_code, sizeof(p_dvb1_data_start_code) ) )
1132 cc_Extract( &p_sys->cc_next, &p_t35[3], i_t35 - 3 );