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 *****************************************************************************/
36 #include <vlc_common.h>
37 #include <vlc_plugin.h>
39 #include <vlc_codec.h>
40 #include <vlc_block.h>
42 #include <vlc_block_helper.h>
44 #include "../codec/cc.h"
45 #include "packetizer_helper.h"
47 /*****************************************************************************
49 *****************************************************************************/
50 static int Open ( vlc_object_t * );
51 static void Close( vlc_object_t * );
54 set_category( CAT_SOUT )
55 set_subcategory( SUBCAT_SOUT_PACKETIZER )
56 set_description( N_("H.264 video packetizer") )
57 set_capability( "packetizer", 50 )
58 set_callbacks( Open, Close )
62 /****************************************************************************
64 ****************************************************************************/
71 int i_pic_parameter_set_id;
75 int i_bottom_field_flag;
79 int i_pic_order_cnt_lsb;
80 int i_delta_pic_order_cnt_bottom;
82 int i_delta_pic_order_cnt0;
83 int i_delta_pic_order_cnt1;
91 packetizer_t packetizer;
100 block_t *pp_sps[SPS_MAX];
101 block_t *pp_pps[PPS_MAX];
104 int i_avcC_length_size;
106 /* Useful values of the Sequence Parameter Set */
107 int i_log2_max_frame_num;
108 int b_frame_mbs_only;
109 int i_pic_order_cnt_type;
110 int i_delta_pic_order_always_zero_flag;
111 int i_log2_max_pic_order_cnt_lsb;
113 /* Value from Picture Parameter Set */
114 int i_pic_order_present_flag;
116 /* Useful values of the Slice Header */
139 NAL_SLICE_IDR = 5, /* ref_idc != 0 */
140 NAL_SEI = 6, /* ref_idc == 0 */
144 /* ref_idc == 0 for 6,9,10,11,12 */
149 NAL_PRIORITY_DISPOSABLE = 0,
150 NAL_PRIORITY_LOW = 1,
151 NAL_PRIORITY_HIGH = 2,
152 NAL_PRIORITY_HIGHEST = 3,
155 #define BLOCK_FLAG_PRIVATE_AUD (1 << BLOCK_FLAG_PRIVATE_SHIFT)
157 static block_t *Packetize( decoder_t *, block_t ** );
158 static block_t *PacketizeAVC1( decoder_t *, block_t ** );
159 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] );
161 static void PacketizeReset( void *p_private, bool b_broken );
162 static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t * );
163 static int PacketizeValidate( void *p_private, block_t * );
165 static block_t *ParseNALBlock( decoder_t *, bool *pb_used_ts, block_t * );
166 static block_t *CreateAnnexbNAL( decoder_t *, const uint8_t *p, int );
168 static block_t *OutputPicture( decoder_t *p_dec );
169 static void PutSPS( decoder_t *p_dec, block_t *p_frag );
170 static void PutPPS( decoder_t *p_dec, block_t *p_frag );
171 static void ParseSlice( decoder_t *p_dec, bool *pb_new_picture, slice_t *p_slice,
172 int i_nal_ref_idc, int i_nal_type, const block_t *p_frag );
173 static void ParseSei( decoder_t *, block_t * );
176 static const uint8_t p_h264_startcode[3] = { 0x00, 0x00, 0x01 };
178 /*****************************************************************************
179 * Open: probe the packetizer and return score
180 * When opening after demux, the packetizer is only loaded AFTER the decoder
181 * That means that what you set in fmt_out is ignored by the decoder in this special case
182 *****************************************************************************/
183 static int Open( vlc_object_t *p_this )
185 decoder_t *p_dec = (decoder_t*)p_this;
186 decoder_sys_t *p_sys;
189 if( p_dec->fmt_in.i_codec != VLC_CODEC_H264 )
191 if( p_dec->fmt_in.i_original_fourcc == VLC_FOURCC( 'a', 'v', 'c', '1') &&
192 p_dec->fmt_in.i_extra < 7 )
195 /* Allocate the memory needed to store the decoder's structure */
196 if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
201 packetizer_Init( &p_sys->packetizer,
202 p_h264_startcode, sizeof(p_h264_startcode),
204 PacketizeReset, PacketizeParse, PacketizeValidate, p_dec );
206 p_sys->b_slice = false;
207 p_sys->p_frame = NULL;
208 p_sys->b_header= false;
209 p_sys->b_sps = false;
210 p_sys->b_pps = false;
211 for( i = 0; i < SPS_MAX; i++ )
212 p_sys->pp_sps[i] = NULL;
213 for( i = 0; i < PPS_MAX; i++ )
214 p_sys->pp_pps[i] = NULL;
216 p_sys->slice.i_nal_type = -1;
217 p_sys->slice.i_nal_ref_idc = -1;
218 p_sys->slice.i_idr_pic_id = -1;
219 p_sys->slice.i_frame_num = -1;
220 p_sys->slice.i_frame_type = 0;
221 p_sys->slice.i_pic_parameter_set_id = -1;
222 p_sys->slice.i_field_pic_flag = 0;
223 p_sys->slice.i_bottom_field_flag = -1;
224 p_sys->slice.i_pic_order_cnt_lsb = -1;
225 p_sys->slice.i_delta_pic_order_cnt_bottom = -1;
227 p_sys->i_frame_dts = VLC_TS_INVALID;
228 p_sys->i_frame_pts = VLC_TS_INVALID;
230 /* Setup properties */
231 es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
232 p_dec->fmt_out.i_codec = VLC_CODEC_H264;
234 if( p_dec->fmt_in.i_original_fourcc == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
236 /* This type of stream is produced by mp4 and matroska
237 * when we want to store it in another streamformat, you need to convert
238 * The fmt_in.p_extra should ALWAYS contain the avcC
239 * The fmt_out.p_extra should contain all the SPS and PPS with 4 byte startcodes */
240 uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
246 p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
250 for( i = 0; i < i_sps; i++ )
252 uint16_t i_length = GetWBE( p ); p += 2;
254 (uint8_t*)p_dec->fmt_in.p_extra + p_dec->fmt_in.i_extra - p )
258 block_t *p_sps = CreateAnnexbNAL( p_dec, p, i_length );
261 ParseNALBlock( p_dec, &b_dummy, p_sps );
266 for( i = 0; i < i_pps; i++ )
268 uint16_t i_length = GetWBE( p ); p += 2;
270 (uint8_t*)p_dec->fmt_in.p_extra + p_dec->fmt_in.i_extra - p )
274 block_t *p_pps = CreateAnnexbNAL( p_dec, p, i_length );
277 ParseNALBlock( p_dec, &b_dummy, p_pps );
280 msg_Dbg( p_dec, "avcC length size=%d, sps=%d, pps=%d",
281 p_sys->i_avcC_length_size, i_sps, i_pps );
283 if( !p_sys->b_sps || !p_sys->b_pps )
286 /* FIXME: FFMPEG isn't happy at all if you leave this */
287 if( p_dec->fmt_out.i_extra > 0 )
288 free( p_dec->fmt_out.p_extra );
289 p_dec->fmt_out.i_extra = 0;
290 p_dec->fmt_out.p_extra = NULL;
292 /* Set the new extradata */
293 for( i = 0; i < SPS_MAX; i++ )
295 if( p_sys->pp_sps[i] )
296 p_dec->fmt_out.i_extra += p_sys->pp_sps[i]->i_buffer;
298 for( i = 0; i < PPS_MAX; i++ )
300 if( p_sys->pp_pps[i] )
301 p_dec->fmt_out.i_extra += p_sys->pp_pps[i]->i_buffer;
303 p_dec->fmt_out.p_extra = malloc( p_dec->fmt_out.i_extra );
304 if( p_dec->fmt_out.p_extra )
306 uint8_t *p_dst = p_dec->fmt_out.p_extra;
308 for( i = 0; i < SPS_MAX; i++ )
310 if( p_sys->pp_sps[i] )
312 memcpy( p_dst, p_sys->pp_sps[i]->p_buffer, p_sys->pp_sps[i]->i_buffer );
313 p_dst += p_sys->pp_sps[i]->i_buffer;
316 for( i = 0; i < PPS_MAX; i++ )
318 if( p_sys->pp_pps[i] )
320 memcpy( p_dst, p_sys->pp_pps[i]->p_buffer, p_sys->pp_pps[i]->i_buffer );
321 p_dst += p_sys->pp_pps[i]->i_buffer;
324 p_sys->b_header = true;
328 p_dec->fmt_out.i_extra = 0;
332 p_dec->pf_packetize = PacketizeAVC1;
337 /* This type of stream contains data with 3 of 4 byte startcodes
338 * The fmt_in.p_extra MAY contain SPS/PPS with 4 byte startcodes
339 * The fmt_out.p_extra should be the same */
342 p_dec->pf_packetize = Packetize;
343 p_dec->pf_get_cc = GetCc;
346 p_sys->i_cc_pts = VLC_TS_INVALID;
347 p_sys->i_cc_dts = VLC_TS_INVALID;
348 p_sys->i_cc_flags = 0;
349 cc_Init( &p_sys->cc );
350 cc_Init( &p_sys->cc_next );
353 if( p_dec->fmt_in.i_extra > 0 )
354 packetizer_Header( &p_sys->packetizer,
355 p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra );
361 /*****************************************************************************
362 * Close: clean up the packetizer
363 *****************************************************************************/
364 static void Close( vlc_object_t *p_this )
366 decoder_t *p_dec = (decoder_t*)p_this;
367 decoder_sys_t *p_sys = p_dec->p_sys;
371 block_ChainRelease( p_sys->p_frame );
372 for( i = 0; i < SPS_MAX; i++ )
374 if( p_sys->pp_sps[i] )
375 block_Release( p_sys->pp_sps[i] );
377 for( i = 0; i < PPS_MAX; i++ )
379 if( p_sys->pp_pps[i] )
380 block_Release( p_sys->pp_pps[i] );
382 packetizer_Clean( &p_sys->packetizer );
384 if( p_dec->pf_get_cc )
386 cc_Exit( &p_sys->cc_next );
387 cc_Exit( &p_sys->cc );
393 /****************************************************************************
394 * Packetize: the whole thing
395 * Search for the startcodes 3 or more bytes
396 * Feed ParseNALBlock ALWAYS with 4 byte startcode prepended NALs
397 ****************************************************************************/
398 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
400 decoder_sys_t *p_sys = p_dec->p_sys;
402 return packetizer_Packetize( &p_sys->packetizer, pp_block );
405 /****************************************************************************
406 * PacketizeAVC1: Takes VCL blocks of data and creates annexe B type NAL stream
407 * Will always use 4 byte 0 0 0 1 startcodes
408 * Will prepend a SPS and PPS before each keyframe
409 ****************************************************************************/
410 static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
412 decoder_sys_t *p_sys = p_dec->p_sys;
414 block_t *p_ret = NULL;
417 if( !pp_block || !*pp_block )
419 if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
421 block_Release( *pp_block );
428 for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
435 for( i = 0; i < p_sys->i_avcC_length_size; i++ )
437 i_size = (i_size << 8) | (*p++);
441 i_size > ( p_block->p_buffer + p_block->i_buffer - p ) )
443 msg_Err( p_dec, "Broken frame : size %d is too big", i_size );
447 block_t *p_part = CreateAnnexbNAL( p_dec, p, i_size );
451 p_part->i_dts = p_block->i_dts;
452 p_part->i_pts = p_block->i_pts;
455 if( ( p_pic = ParseNALBlock( p_dec, &b_dummy, p_part ) ) )
457 block_ChainAppend( &p_ret, p_pic );
461 block_Release( p_block );
466 /*****************************************************************************
468 *****************************************************************************/
469 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] )
471 decoder_sys_t *p_sys = p_dec->p_sys;
474 for( int i = 0; i < 4; i++ )
475 pb_present[i] = p_sys->cc.pb_present[i];
477 if( p_sys->cc.i_data <= 0 )
480 p_cc = block_New( p_dec, p_sys->cc.i_data);
483 memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
485 p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
486 p_cc->i_flags = ( p_sys->cc.b_reorder ? p_sys->i_cc_flags : BLOCK_FLAG_TYPE_P ) & BLOCK_FLAG_TYPE_MASK;
488 cc_Flush( &p_sys->cc );
492 /****************************************************************************
494 ****************************************************************************/
495 static void PacketizeReset( void *p_private, bool b_broken )
497 decoder_t *p_dec = p_private;
498 decoder_sys_t *p_sys = p_dec->p_sys;
503 block_ChainRelease( p_sys->p_frame );
504 p_sys->p_frame = NULL;
505 p_sys->slice.i_frame_type = 0;
506 p_sys->b_slice = false;
508 p_sys->i_frame_pts = VLC_TS_INVALID;
509 p_sys->i_frame_dts = VLC_TS_INVALID;
511 static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t *p_block )
513 decoder_t *p_dec = p_private;
515 /* Remove trailing 0 bytes */
516 while( p_block->i_buffer && p_block->p_buffer[p_block->i_buffer-1] == 0x00 )
519 return ParseNALBlock( p_dec, pb_ts_used, p_block );
521 static int PacketizeValidate( void *p_private, block_t *p_au )
523 VLC_UNUSED(p_private);
528 static block_t *CreateAnnexbNAL( decoder_t *p_dec, const uint8_t *p, int i_size )
532 p_nal = block_New( p_dec, 4 + i_size );
533 if( !p_nal ) return NULL;
536 p_nal->p_buffer[0] = 0x00;
537 p_nal->p_buffer[1] = 0x00;
538 p_nal->p_buffer[2] = 0x00;
539 p_nal->p_buffer[3] = 0x01;
542 memcpy( &p_nal->p_buffer[4], p, i_size );
548 static void CreateDecodedNAL( uint8_t **pp_ret, int *pi_ret,
549 const uint8_t *src, int i_src )
551 const uint8_t *end = &src[i_src];
552 uint8_t *dst = malloc( i_src );
560 if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
572 *pi_ret = dst - *pp_ret;
575 static inline int bs_read_ue( bs_t *s )
579 while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
583 return( ( 1 << i) - 1 + bs_read( s, i ) );
586 static inline int bs_read_se( bs_t *s )
588 int val = bs_read_ue( s );
590 return val&0x01 ? (val+1)/2 : -(val/2);
593 /*****************************************************************************
594 * ParseNALBlock: parses annexB type NALs
595 * All p_frag blocks are required to start with 0 0 0 1 4-byte startcode
596 *****************************************************************************/
597 static block_t *ParseNALBlock( decoder_t *p_dec, bool *pb_used_ts, block_t *p_frag )
599 decoder_sys_t *p_sys = p_dec->p_sys;
600 block_t *p_pic = NULL;
602 const int i_nal_ref_idc = (p_frag->p_buffer[4] >> 5)&0x03;
603 const int i_nal_type = p_frag->p_buffer[4]&0x1f;
604 const mtime_t i_frag_dts = p_frag->i_dts;
605 const mtime_t i_frag_pts = p_frag->i_pts;
607 if( p_sys->b_slice && ( !p_sys->b_sps || !p_sys->b_pps ) )
609 block_ChainRelease( p_sys->p_frame );
610 msg_Warn( p_dec, "waiting for SPS/PPS" );
613 p_sys->slice.i_frame_type = 0;
614 p_sys->p_frame = NULL;
615 p_sys->b_slice = false;
616 cc_Flush( &p_sys->cc_next );
619 if( ( !p_sys->b_sps || !p_sys->b_pps ) &&
620 i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
622 p_sys->b_slice = true;
623 /* Fragment will be discarded later on */
625 else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
630 ParseSlice( p_dec, &b_new_picture, &slice, i_nal_ref_idc, i_nal_type, p_frag );
633 if( b_new_picture && p_sys->b_slice )
634 p_pic = OutputPicture( p_dec );
637 p_sys->slice = slice;
638 p_sys->b_slice = true;
640 else if( i_nal_type == NAL_SPS )
643 p_pic = OutputPicture( p_dec );
645 PutSPS( p_dec, p_frag );
647 /* Do not append the SPS because we will insert it on keyframes */
650 else if( i_nal_type == NAL_PPS )
653 p_pic = OutputPicture( p_dec );
655 PutPPS( p_dec, p_frag );
657 /* Do not append the PPS because we will insert it on keyframes */
660 else if( i_nal_type == NAL_AU_DELIMITER ||
661 i_nal_type == NAL_SEI ||
662 ( i_nal_type >= 13 && i_nal_type <= 18 ) )
665 p_pic = OutputPicture( p_dec );
667 /* Parse SEI for CC support */
668 if( i_nal_type == NAL_SEI )
670 ParseSei( p_dec, p_frag );
672 else if( i_nal_type == NAL_AU_DELIMITER )
674 if( p_sys->p_frame && (p_sys->p_frame->i_flags & BLOCK_FLAG_PRIVATE_AUD) )
676 block_Release( p_frag );
681 p_frag->i_flags |= BLOCK_FLAG_PRIVATE_AUD;
686 /* Append the block */
688 block_ChainAppend( &p_sys->p_frame, p_frag );
691 if( p_sys->i_frame_dts <= VLC_TS_INVALID &&
692 p_sys->i_frame_pts <= VLC_TS_INVALID )
694 p_sys->i_frame_dts = i_frag_dts;
695 p_sys->i_frame_pts = i_frag_pts;
701 static block_t *OutputPicture( decoder_t *p_dec )
703 decoder_sys_t *p_sys = p_dec->p_sys;
706 if( !p_sys->b_header && p_sys->slice.i_frame_type != BLOCK_FLAG_TYPE_I)
709 if( p_sys->slice.i_frame_type == BLOCK_FLAG_TYPE_I && p_sys->b_sps && p_sys->b_pps )
711 block_t *p_head = NULL;
712 if( p_sys->p_frame->i_flags & BLOCK_FLAG_PRIVATE_AUD )
714 p_head = p_sys->p_frame;
715 p_sys->p_frame = p_sys->p_frame->p_next;
718 block_t *p_list = NULL;
719 for( int i = 0; i < SPS_MAX; i++ )
721 if( p_sys->pp_sps[i] )
722 block_ChainAppend( &p_list, block_Duplicate( p_sys->pp_sps[i] ) );
724 for( int i = 0; i < PPS_MAX; i++ )
726 if( p_sys->pp_pps[i] )
727 block_ChainAppend( &p_list, block_Duplicate( p_sys->pp_pps[i] ) );
730 p_sys->b_header = true;
733 p_head->p_next = p_list;
736 block_ChainAppend( &p_head, p_sys->p_frame );
738 p_pic = block_ChainGather( p_head );
742 p_pic = block_ChainGather( p_sys->p_frame );
744 p_pic->i_dts = p_sys->i_frame_dts;
745 p_pic->i_pts = p_sys->i_frame_pts;
746 p_pic->i_length = 0; /* FIXME */
747 p_pic->i_flags |= p_sys->slice.i_frame_type;
748 p_pic->i_flags &= ~BLOCK_FLAG_PRIVATE_AUD;
750 p_sys->slice.i_frame_type = 0;
751 p_sys->p_frame = NULL;
752 p_sys->i_frame_dts = VLC_TS_INVALID;
753 p_sys->i_frame_pts = VLC_TS_INVALID;
754 p_sys->b_slice = false;
757 p_sys->i_cc_pts = p_pic->i_pts;
758 p_sys->i_cc_dts = p_pic->i_dts;
759 p_sys->i_cc_flags = p_pic->i_flags;
762 cc_data_t cc_tmp = p_sys->cc;
763 p_sys->cc = p_sys->cc_next;
764 p_sys->cc_next = cc_tmp;
766 cc_Flush( &p_sys->cc_next );
771 static void PutSPS( decoder_t *p_dec, block_t *p_frag )
773 decoder_sys_t *p_sys = p_dec->p_sys;
775 uint8_t *pb_dec = NULL;
781 CreateDecodedNAL( &pb_dec, &i_dec, &p_frag->p_buffer[5],
782 p_frag->i_buffer - 5 );
784 bs_init( &s, pb_dec, i_dec );
785 int i_profile_idc = bs_read( &s, 8 );
786 p_dec->fmt_out.i_profile = i_profile_idc;
787 /* Skip constraint_set0123, reserved(4) */
788 bs_skip( &s, 1+1+1+1 + 4 );
789 p_dec->fmt_out.i_level = bs_read( &s, 8 );
791 i_sps_id = bs_read_ue( &s );
792 if( i_sps_id >= SPS_MAX )
794 msg_Warn( p_dec, "invalid SPS (sps_id=%d)", i_sps_id );
796 block_Release( p_frag );
800 if( i_profile_idc == 100 || i_profile_idc == 110 ||
801 i_profile_idc == 122 || i_profile_idc == 244 ||
802 i_profile_idc == 44 || i_profile_idc == 83 ||
803 i_profile_idc == 86 )
805 /* chroma_format_idc */
806 const int i_chroma_format_idc = bs_read_ue( &s );
807 if( i_chroma_format_idc == 3 )
808 bs_skip( &s, 1 ); /* seperate_colour_plane_flag */
809 /* bit_depth_luma_minus8 */
811 /* bit_depth_chroma_minus8 */
813 /* qpprime_y_zero_transform_bypass_flag */
815 /* seq_scaling_matrix_present_flag */
816 i_tmp = bs_read( &s, 1 );
819 for( int i = 0; i < ((3 != i_chroma_format_idc) ? 8 : 12); i++ )
821 /* seq_scaling_list_present_flag[i] */
822 i_tmp = bs_read( &s, 1 );
825 const int i_size_of_scaling_list = (i < 6 ) ? 16 : 64;
826 /* scaling_list (...) */
829 for( int j = 0; j < i_size_of_scaling_list; j++ )
831 if( i_nextscale != 0 )
834 i_tmp = bs_read( &s, 1 );
835 i_nextscale = ( i_lastscale + i_tmp + 256 ) % 256;
836 /* useDefaultScalingMatrixFlag = ... */
839 i_lastscale = ( i_nextscale == 0 ) ? i_lastscale : i_nextscale;
845 /* Skip i_log2_max_frame_num */
846 p_sys->i_log2_max_frame_num = bs_read_ue( &s );
847 if( p_sys->i_log2_max_frame_num > 12)
848 p_sys->i_log2_max_frame_num = 12;
850 p_sys->i_pic_order_cnt_type = bs_read_ue( &s );
851 if( p_sys->i_pic_order_cnt_type == 0 )
853 /* skip i_log2_max_poc_lsb */
854 p_sys->i_log2_max_pic_order_cnt_lsb = bs_read_ue( &s );
855 if( p_sys->i_log2_max_pic_order_cnt_lsb > 12 )
856 p_sys->i_log2_max_pic_order_cnt_lsb = 12;
858 else if( p_sys->i_pic_order_cnt_type == 1 )
861 /* skip b_delta_pic_order_always_zero */
862 p_sys->i_delta_pic_order_always_zero_flag = bs_read( &s, 1 );
863 /* skip i_offset_for_non_ref_pic */
865 /* skip i_offset_for_top_to_bottom_field */
867 /* read i_num_ref_frames_in_poc_cycle */
868 i_cycle = bs_read_ue( &s );
869 if( i_cycle > 256 ) i_cycle = 256;
872 /* skip i_offset_for_ref_frame */
877 /* i_num_ref_frames */
879 /* b_gaps_in_frame_num_value_allowed */
883 p_dec->fmt_out.video.i_width = 16 * ( bs_read_ue( &s ) + 1 );
884 p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );
886 /* b_frame_mbs_only */
887 p_sys->b_frame_mbs_only = bs_read( &s, 1 );
888 if( p_sys->b_frame_mbs_only == 0 )
892 /* b_direct8x8_inference */
896 i_tmp = bs_read( &s, 1 );
910 i_tmp = bs_read( &s, 1 );
913 /* read the aspect ratio part if any */
914 i_tmp = bs_read( &s, 1 );
917 static const struct { int w, h; } sar[17] =
919 { 0, 0 }, { 1, 1 }, { 12, 11 }, { 10, 11 },
920 { 16, 11 }, { 40, 33 }, { 24, 11 }, { 20, 11 },
921 { 32, 11 }, { 80, 33 }, { 18, 11 }, { 15, 11 },
922 { 64, 33 }, { 160,99 }, { 4, 3 }, { 3, 2 },
925 int i_sar = bs_read( &s, 8 );
933 else if( i_sar == 255 )
935 w = bs_read( &s, 16 );
936 h = bs_read( &s, 16 );
944 if( w != 0 && h != 0 )
946 p_dec->fmt_out.video.i_sar_num = w;
947 p_dec->fmt_out.video.i_sar_den = h;
951 p_dec->fmt_out.video.i_sar_num = 1;
952 p_dec->fmt_out.video.i_sar_den = 1;
959 /* We have a new SPS */
961 msg_Dbg( p_dec, "found NAL_SPS (sps_id=%d)", i_sps_id );
964 if( p_sys->pp_sps[i_sps_id] )
965 block_Release( p_sys->pp_sps[i_sps_id] );
966 p_sys->pp_sps[i_sps_id] = p_frag;
969 static void PutPPS( decoder_t *p_dec, block_t *p_frag )
971 decoder_sys_t *p_sys = p_dec->p_sys;
976 bs_init( &s, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
977 i_pps_id = bs_read_ue( &s ); // pps id
978 i_sps_id = bs_read_ue( &s ); // sps id
979 if( i_pps_id >= PPS_MAX || i_sps_id >= SPS_MAX )
981 msg_Warn( p_dec, "invalid PPS (pps_id=%d sps_id=%d)", i_pps_id, i_sps_id );
982 block_Release( p_frag );
985 bs_skip( &s, 1 ); // entropy coding mode flag
986 p_sys->i_pic_order_present_flag = bs_read( &s, 1 );
989 /* We have a new PPS */
991 msg_Dbg( p_dec, "found NAL_PPS (pps_id=%d sps_id=%d)", i_pps_id, i_sps_id );
994 if( p_sys->pp_pps[i_pps_id] )
995 block_Release( p_sys->pp_pps[i_pps_id] );
996 p_sys->pp_pps[i_pps_id] = p_frag;
999 static void ParseSlice( decoder_t *p_dec, bool *pb_new_picture, slice_t *p_slice,
1000 int i_nal_ref_idc, int i_nal_type, const block_t *p_frag )
1002 decoder_sys_t *p_sys = p_dec->p_sys;
1005 int i_first_mb, i_slice_type;
1009 /* do not convert the whole frame */
1010 CreateDecodedNAL( &pb_dec, &i_dec, &p_frag->p_buffer[5],
1011 __MIN( p_frag->i_buffer - 5, 60 ) );
1012 bs_init( &s, pb_dec, i_dec );
1014 /* first_mb_in_slice */
1015 i_first_mb = bs_read_ue( &s );
1018 switch( (i_slice_type = bs_read_ue( &s )) )
1021 slice.i_frame_type = BLOCK_FLAG_TYPE_P;
1024 slice.i_frame_type = BLOCK_FLAG_TYPE_B;
1027 slice.i_frame_type = BLOCK_FLAG_TYPE_I;
1029 case 3: case 8: /* SP */
1030 slice.i_frame_type = BLOCK_FLAG_TYPE_P;
1033 slice.i_frame_type = BLOCK_FLAG_TYPE_I;
1036 slice.i_frame_type = 0;
1041 slice.i_nal_type = i_nal_type;
1042 slice.i_nal_ref_idc = i_nal_ref_idc;
1044 slice.i_pic_parameter_set_id = bs_read_ue( &s );
1045 slice.i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );
1047 slice.i_field_pic_flag = 0;
1048 slice.i_bottom_field_flag = -1;
1049 if( !p_sys->b_frame_mbs_only )
1051 /* field_pic_flag */
1052 slice.i_field_pic_flag = bs_read( &s, 1 );
1053 if( slice.i_field_pic_flag )
1054 slice.i_bottom_field_flag = bs_read( &s, 1 );
1057 slice.i_idr_pic_id = p_sys->slice.i_idr_pic_id;
1058 if( slice.i_nal_type == NAL_SLICE_IDR )
1059 slice.i_idr_pic_id = bs_read_ue( &s );
1061 slice.i_pic_order_cnt_lsb = -1;
1062 slice.i_delta_pic_order_cnt_bottom = -1;
1063 slice.i_delta_pic_order_cnt0 = 0;
1064 slice.i_delta_pic_order_cnt1 = 0;
1065 if( p_sys->i_pic_order_cnt_type == 0 )
1067 slice.i_pic_order_cnt_lsb = bs_read( &s, p_sys->i_log2_max_pic_order_cnt_lsb + 4 );
1068 if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
1069 slice.i_delta_pic_order_cnt_bottom = bs_read_se( &s );
1071 else if( (p_sys->i_pic_order_cnt_type == 1) &&
1072 (!p_sys->i_delta_pic_order_always_zero_flag) )
1074 slice.i_delta_pic_order_cnt0 = bs_read_se( &s );
1075 if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
1076 slice.i_delta_pic_order_cnt1 = bs_read_se( &s );
1080 /* Detection of the first VCL NAL unit of a primary coded picture
1081 * (cf. 7.4.1.2.4) */
1083 if( slice.i_frame_num != p_sys->slice.i_frame_num ||
1084 slice.i_pic_parameter_set_id != p_sys->slice.i_pic_parameter_set_id ||
1085 slice.i_field_pic_flag != p_sys->slice.i_field_pic_flag ||
1086 slice.i_nal_ref_idc != p_sys->slice.i_nal_ref_idc )
1088 if( (slice.i_bottom_field_flag != -1) &&
1089 (p_sys->slice.i_bottom_field_flag != -1) &&
1090 (slice.i_bottom_field_flag != p_sys->slice.i_bottom_field_flag) )
1092 if( p_sys->i_pic_order_cnt_type == 0 &&
1093 ( slice.i_pic_order_cnt_lsb != p_sys->slice.i_pic_order_cnt_lsb ||
1094 slice.i_delta_pic_order_cnt_bottom != p_sys->slice.i_delta_pic_order_cnt_bottom ) )
1096 else if( p_sys->i_pic_order_cnt_type == 1 &&
1097 ( slice.i_delta_pic_order_cnt0 != p_sys->slice.i_delta_pic_order_cnt0 ||
1098 slice.i_delta_pic_order_cnt1 != p_sys->slice.i_delta_pic_order_cnt1 ) )
1100 if( ( slice.i_nal_type == NAL_SLICE_IDR || p_sys->slice.i_nal_type == NAL_SLICE_IDR ) &&
1101 ( slice.i_nal_type != p_sys->slice.i_nal_type || slice.i_idr_pic_id != p_sys->slice.i_idr_pic_id ) )
1105 *pb_new_picture = b_pic;
1109 static void ParseSei( decoder_t *p_dec, block_t *p_frag )
1111 decoder_sys_t *p_sys = p_dec->p_sys;
1116 CreateDecodedNAL( &pb_dec, &i_dec, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
1120 /* The +1 is for rbsp trailing bits */
1121 for( int i_used = 0; i_used+1 < i_dec; )
1125 while( i_used+1 < i_dec )
1127 const int i_byte = pb_dec[i_used++];
1129 if( i_byte != 0xff )
1134 while( i_used+1 < i_dec )
1136 const int i_byte = pb_dec[i_used++];
1138 if( i_byte != 0xff )
1142 if( i_used + i_size + 1 > i_dec )
1145 /* Look for user_data_registered_itu_t_t35 */
1148 static const uint8_t p_dvb1_data_start_code[] = {
1151 0x47, 0x41, 0x39, 0x34
1153 const int i_t35 = i_size;
1154 const uint8_t *p_t35 = &pb_dec[i_used];
1156 /* Check for we have DVB1_data() */
1158 !memcmp( p_t35, p_dvb1_data_start_code, sizeof(p_dvb1_data_start_code) ) )
1160 cc_Extract( &p_sys->cc_next, true, &p_t35[3], i_t35 - 3 );