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"
44 /*****************************************************************************
46 *****************************************************************************/
47 static int Open ( vlc_object_t * );
48 static void Close( vlc_object_t * );
51 set_category( CAT_SOUT )
52 set_subcategory( SUBCAT_SOUT_PACKETIZER )
53 set_description( N_("H.264 video packetizer") )
54 set_capability( "packetizer", 50 )
55 set_callbacks( Open, Close )
59 /****************************************************************************
61 ****************************************************************************/
62 static block_t *Packetize( decoder_t *, block_t ** );
63 static block_t *PacketizeAVC1( decoder_t *, block_t ** );
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;
90 block_bytestream_t bytestream;
102 block_t *pp_sps[SPS_MAX];
103 block_t *pp_pps[PPS_MAX];
106 int i_avcC_length_size;
108 /* Useful values of the Sequence Parameter Set */
109 int i_log2_max_frame_num;
110 int b_frame_mbs_only;
111 int i_pic_order_cnt_type;
112 int i_delta_pic_order_always_zero_flag;
113 int i_log2_max_pic_order_cnt_lsb;
115 /* Value from Picture Parameter Set */
116 int i_pic_order_present_flag;
118 /* 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 static block_t *ParseNALBlock( decoder_t *, bool *pb_used_ts, block_t * );
157 static block_t *CreateAnnexbNAL( decoder_t *, const uint8_t *p, int );
159 static block_t *OutputPicture( decoder_t *p_dec );
160 static void PutSPS( decoder_t *p_dec, block_t *p_frag );
161 static void PutPPS( decoder_t *p_dec, block_t *p_frag );
162 static void ParseSlice( decoder_t *p_dec, bool *pb_new_picture, slice_t *p_slice,
163 int i_nal_ref_idc, int i_nal_type, const block_t *p_frag );
166 /*****************************************************************************
167 * Open: probe the packetizer and return score
168 * When opening after demux, the packetizer is only loaded AFTER the decoder
169 * That means that what you set in fmt_out is ignored by the decoder in this special case
170 *****************************************************************************/
171 static int Open( vlc_object_t *p_this )
173 decoder_t *p_dec = (decoder_t*)p_this;
174 decoder_sys_t *p_sys;
177 if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'h', '2', '6', '4') &&
178 p_dec->fmt_in.i_codec != VLC_FOURCC( 'H', '2', '6', '4') &&
179 p_dec->fmt_in.i_codec != VLC_FOURCC( 'V', 'S', 'S', 'H') &&
180 p_dec->fmt_in.i_codec != VLC_FOURCC( 'v', 's', 's', 'h') &&
181 p_dec->fmt_in.i_codec != VLC_FOURCC( 'D', 'A', 'V', 'C') &&
182 p_dec->fmt_in.i_codec != VLC_FOURCC( 'x', '2', '6', '4') &&
183 p_dec->fmt_in.i_codec != VLC_FOURCC( 'X', '2', '6', '4') &&
184 ( p_dec->fmt_in.i_codec != VLC_FOURCC( 'a', 'v', 'c', '1') ||
185 p_dec->fmt_in.i_extra < 7 ) )
190 /* Allocate the memory needed to store the decoder's structure */
191 if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
195 p_sys->i_state = STATE_NOSYNC;
197 p_sys->startcode[0] = 0;
198 p_sys->startcode[1] = 0;
199 p_sys->startcode[2] = 0;
200 p_sys->startcode[3] = 1;
201 p_sys->bytestream = block_BytestreamInit();
202 p_sys->b_slice = false;
203 p_sys->p_frame = NULL;
204 p_sys->b_header= false;
205 p_sys->b_sps = false;
206 p_sys->b_pps = false;
207 for( i = 0; i < SPS_MAX; i++ )
208 p_sys->pp_sps[i] = NULL;
209 for( i = 0; i < PPS_MAX; i++ )
210 p_sys->pp_pps[i] = NULL;
212 p_sys->slice.i_nal_type = -1;
213 p_sys->slice.i_nal_ref_idc = -1;
214 p_sys->slice.i_idr_pic_id = -1;
215 p_sys->slice.i_frame_num = -1;
216 p_sys->slice.i_frame_type = 0;
217 p_sys->slice.i_pic_parameter_set_id = -1;
218 p_sys->slice.i_field_pic_flag = 0;
219 p_sys->slice.i_bottom_field_flag = -1;
220 p_sys->slice.i_pic_order_cnt_lsb = -1;
221 p_sys->slice.i_delta_pic_order_cnt_bottom = -1;
223 p_sys->i_frame_dts = -1;
224 p_sys->i_frame_pts = -1;
226 /* Setup properties */
227 es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
228 p_dec->fmt_out.i_codec = VLC_FOURCC( 'h', '2', '6', '4' );
230 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
232 /* This type of stream is produced by mp4 and matroska
233 * when we want to store it in another streamformat, you need to convert
234 * The fmt_in.p_extra should ALWAYS contain the avcC
235 * The fmt_out.p_extra should contain all the SPS and PPS with 4 byte startcodes */
236 uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
242 p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
246 for( i = 0; i < i_sps; i++ )
248 uint16_t i_length = GetWBE( p ); p += 2;
250 (uint8_t*)p_dec->fmt_in.p_extra + p_dec->fmt_in.i_extra - p )
254 block_t *p_sps = CreateAnnexbNAL( p_dec, p, i_length );
257 ParseNALBlock( p_dec, &b_dummy, p_sps );
262 for( i = 0; i < i_pps; i++ )
264 uint16_t i_length = GetWBE( p ); p += 2;
266 (uint8_t*)p_dec->fmt_in.p_extra + p_dec->fmt_in.i_extra - p )
270 block_t *p_pps = CreateAnnexbNAL( p_dec, p, i_length );
273 ParseNALBlock( p_dec, &b_dummy, p_pps );
276 msg_Dbg( p_dec, "avcC length size=%d, sps=%d, pps=%d",
277 p_sys->i_avcC_length_size, i_sps, i_pps );
279 if( !p_sys->b_sps || !p_sys->b_pps )
282 /* FIXME: FFMPEG isn't happy at all if you leave this */
283 if( p_dec->fmt_out.i_extra > 0 )
284 free( p_dec->fmt_out.p_extra );
285 p_dec->fmt_out.i_extra = 0;
286 p_dec->fmt_out.p_extra = NULL;
288 /* Set the new extradata */
289 for( i = 0; i < SPS_MAX; i++ )
291 if( p_sys->pp_sps[i] )
292 p_dec->fmt_out.i_extra += p_sys->pp_sps[i]->i_buffer;
294 for( i = 0; i < PPS_MAX; i++ )
296 if( p_sys->pp_pps[i] )
297 p_dec->fmt_out.i_extra += p_sys->pp_pps[i]->i_buffer;
299 p_dec->fmt_out.p_extra = malloc( p_dec->fmt_out.i_extra );
300 if( p_dec->fmt_out.p_extra )
302 uint8_t *p_dst = p_dec->fmt_out.p_extra;
304 for( i = 0; i < SPS_MAX; i++ )
306 if( p_sys->pp_sps[i] )
308 memcpy( p_dst, p_sys->pp_sps[i]->p_buffer, p_sys->pp_sps[i]->i_buffer );
309 p_dst += p_sys->pp_sps[i]->i_buffer;
312 for( i = 0; i < PPS_MAX; i++ )
314 if( p_sys->pp_pps[i] )
316 memcpy( p_dst, p_sys->pp_pps[i]->p_buffer, p_sys->pp_pps[i]->i_buffer );
317 p_dst += p_sys->pp_pps[i]->i_buffer;
320 p_sys->b_header = true;
324 p_dec->fmt_out.i_extra = 0;
328 p_dec->pf_packetize = PacketizeAVC1;
332 /* This type of stream contains data with 3 of 4 byte startcodes
333 * The fmt_in.p_extra MAY contain SPS/PPS with 4 byte startcodes
334 * The fmt_out.p_extra should be the same */
337 p_dec->pf_packetize = Packetize;
340 if( p_dec->fmt_in.i_extra > 0 )
342 block_t *p_init = block_New( p_dec, p_dec->fmt_in.i_extra );
345 memcpy( p_init->p_buffer, p_dec->fmt_in.p_extra,
346 p_dec->fmt_in.i_extra );
348 while( ( p_pic = Packetize( p_dec, &p_init ) ) )
350 /* Should not occur because we should only receive SPS/PPS */
351 block_Release( p_pic );
359 /*****************************************************************************
360 * Close: clean up the packetizer
361 *****************************************************************************/
362 static void Close( vlc_object_t *p_this )
364 decoder_t *p_dec = (decoder_t*)p_this;
365 decoder_sys_t *p_sys = p_dec->p_sys;
368 if( p_sys->p_frame ) block_ChainRelease( p_sys->p_frame );
369 for( i = 0; i < SPS_MAX; i++ )
371 if( p_sys->pp_sps[i] )
372 block_Release( p_sys->pp_sps[i] );
374 for( i = 0; i < PPS_MAX; i++ )
376 if( p_sys->pp_pps[i] )
377 block_Release( p_sys->pp_pps[i] );
379 block_BytestreamRelease( &p_sys->bytestream );
383 /****************************************************************************
384 * Packetize: the whole thing
385 * Search for the startcodes 3 or more bytes
386 * Feed ParseNALBlock ALWAYS with 4 byte startcode prepended NALs
387 ****************************************************************************/
388 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
390 decoder_sys_t *p_sys = p_dec->p_sys;
393 if( !pp_block || !*pp_block )
396 if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
398 if( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED )
400 p_sys->i_state = STATE_NOSYNC;
401 block_BytestreamFlush( &p_sys->bytestream );
404 block_ChainRelease( p_sys->p_frame );
405 p_sys->p_frame = NULL;
406 p_sys->slice.i_frame_type = 0;
407 p_sys->b_slice = false;
409 block_Release( *pp_block );
413 block_BytestreamPush( &p_sys->bytestream, *pp_block );
419 switch( p_sys->i_state )
422 /* Skip until 3 byte startcode 0 0 1 */
423 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
424 &p_sys->i_offset, p_sys->startcode+1, 3 ) == VLC_SUCCESS)
426 p_sys->i_state = STATE_NEXT_SYNC;
429 if( p_sys->i_offset )
432 block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
434 block_BytestreamFlush( &p_sys->bytestream );
437 if( p_sys->i_state != STATE_NEXT_SYNC )
443 p_sys->i_offset = 1; /* To find next startcode */
445 case STATE_NEXT_SYNC:
446 /* Find the next 3 byte startcode 0 0 1*/
447 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
448 &p_sys->i_offset, p_sys->startcode+1, 3 ) != VLC_SUCCESS)
453 block_BytestreamFlush( &p_sys->bytestream );
455 /* Get the new fragment and set the pts/dts */
456 block_t *p_block_bytestream = p_sys->bytestream.p_block;
458 p_pic = block_New( p_dec, p_sys->i_offset +1 );
459 p_pic->i_pts = p_block_bytestream->i_pts;
460 p_pic->i_dts = p_block_bytestream->i_dts;
462 /* Force 4 byte startcode 0 0 0 1 */
463 p_pic->p_buffer[0] = 0;
465 block_GetBytes( &p_sys->bytestream, &p_pic->p_buffer[1],
468 /* Remove trailing 0 bytes */
469 while( p_pic->i_buffer && (!p_pic->p_buffer[p_pic->i_buffer-1] ) )
474 p_pic = ParseNALBlock( p_dec, &b_used_ts, p_pic );
477 p_block_bytestream->i_dts = -1;
478 p_block_bytestream->i_pts = -1;
483 p_sys->i_state = STATE_NOSYNC;
487 msg_Dbg( p_dec, "pts=%"PRId64" dts=%"PRId64,
488 p_pic->i_pts, p_pic->i_dts );
491 /* So p_block doesn't get re-added several times */
492 *pp_block = block_BytestreamPop( &p_sys->bytestream );
494 p_sys->i_state = STATE_NOSYNC;
501 /****************************************************************************
502 * PacketizeAVC1: Takes VCL blocks of data and creates annexe B type NAL stream
503 * Will always use 4 byte 0 0 0 1 startcodes
504 * Will prepend a SPS and PPS before each keyframe
505 ****************************************************************************/
506 static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
508 decoder_sys_t *p_sys = p_dec->p_sys;
510 block_t *p_ret = NULL;
513 if( !pp_block || !*pp_block )
515 if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
517 block_Release( *pp_block );
524 for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
531 for( i = 0; i < p_sys->i_avcC_length_size; i++ )
533 i_size = (i_size << 8) | (*p++);
537 i_size > ( p_block->p_buffer + p_block->i_buffer - p ) )
539 msg_Err( p_dec, "Broken frame : size %d is too big", i_size );
543 block_t *p_part = CreateAnnexbNAL( p_dec, p, i_size );
547 p_part->i_dts = p_block->i_dts;
548 p_part->i_pts = p_block->i_pts;
551 if( ( p_pic = ParseNALBlock( p_dec, &b_dummy, p_part ) ) )
553 block_ChainAppend( &p_ret, p_pic );
557 block_Release( p_block );
562 /****************************************************************************
564 ****************************************************************************/
565 static block_t *CreateAnnexbNAL( decoder_t *p_dec, const uint8_t *p, int i_size )
569 p_nal = block_New( p_dec, 4 + i_size );
570 if( !p_nal ) return NULL;
573 p_nal->p_buffer[0] = 0x00;
574 p_nal->p_buffer[1] = 0x00;
575 p_nal->p_buffer[2] = 0x00;
576 p_nal->p_buffer[3] = 0x01;
579 memcpy( &p_nal->p_buffer[4], p, i_size );
585 static void CreateDecodedNAL( uint8_t **pp_ret, int *pi_ret,
586 const uint8_t *src, int i_src )
588 const uint8_t *end = &src[i_src];
589 uint8_t *dst = malloc( i_src );
597 if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
609 *pi_ret = dst - *pp_ret;
612 static inline int bs_read_ue( bs_t *s )
616 while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
620 return( ( 1 << i) - 1 + bs_read( s, i ) );
623 static inline int bs_read_se( bs_t *s )
625 int val = bs_read_ue( s );
627 return val&0x01 ? (val+1)/2 : -(val/2);
630 /*****************************************************************************
631 * ParseNALBlock: parses annexB type NALs
632 * All p_frag blocks are required to start with 0 0 0 1 4-byte startcode
633 *****************************************************************************/
634 static block_t *ParseNALBlock( decoder_t *p_dec, bool *pb_used_ts, block_t *p_frag )
636 decoder_sys_t *p_sys = p_dec->p_sys;
637 block_t *p_pic = NULL;
639 const int i_nal_ref_idc = (p_frag->p_buffer[4] >> 5)&0x03;
640 const int i_nal_type = p_frag->p_buffer[4]&0x1f;
641 const mtime_t i_frag_dts = p_frag->i_dts;
642 const mtime_t i_frag_pts = p_frag->i_pts;
644 if( p_sys->b_slice && ( !p_sys->b_sps || !p_sys->b_pps ) )
646 block_ChainRelease( p_sys->p_frame );
647 msg_Warn( p_dec, "waiting for SPS/PPS" );
650 p_sys->slice.i_frame_type = 0;
651 p_sys->p_frame = NULL;
652 p_sys->b_slice = false;
655 if( ( !p_sys->b_sps || !p_sys->b_pps ) &&
656 i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
658 p_sys->b_slice = true;
659 /* Fragment will be discarded later on */
661 else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
666 ParseSlice( p_dec, &b_new_picture, &slice, i_nal_ref_idc, i_nal_type, p_frag );
669 if( b_new_picture && p_sys->b_slice )
670 p_pic = OutputPicture( p_dec );
673 p_sys->slice = slice;
674 p_sys->b_slice = true;
676 else if( i_nal_type == NAL_SPS )
679 p_pic = OutputPicture( p_dec );
681 PutSPS( p_dec, p_frag );
683 /* Do not append the SPS because we will insert it on keyframes */
686 else if( i_nal_type == NAL_PPS )
689 p_pic = OutputPicture( p_dec );
691 PutPPS( p_dec, p_frag );
693 /* Do not append the PPS because we will insert it on keyframes */
696 else if( i_nal_type == NAL_AU_DELIMITER ||
697 i_nal_type == NAL_SEI ||
698 ( i_nal_type >= 13 && i_nal_type <= 18 ) )
701 p_pic = OutputPicture( p_dec );
703 /* TODO parse SEI for CC support */
706 /* Append the block */
708 block_ChainAppend( &p_sys->p_frame, p_frag );
711 if( p_sys->i_frame_dts < 0 && p_sys->i_frame_pts < 0 )
713 p_sys->i_frame_dts = i_frag_dts;
714 p_sys->i_frame_pts = i_frag_pts;
720 static block_t *OutputPicture( decoder_t *p_dec )
722 decoder_sys_t *p_sys = p_dec->p_sys;
725 if( !p_sys->b_header && p_sys->slice.i_frame_type != BLOCK_FLAG_TYPE_I)
728 if( p_sys->slice.i_frame_type == BLOCK_FLAG_TYPE_I && p_sys->b_sps && p_sys->b_pps )
730 block_t *p_list = NULL;
733 for( i = 0; i < SPS_MAX; i++ )
735 if( p_sys->pp_sps[i] )
736 block_ChainAppend( &p_list, block_Duplicate( p_sys->pp_sps[i] ) );
738 for( i = 0; i < PPS_MAX; i++ )
740 if( p_sys->pp_pps[i] )
741 block_ChainAppend( &p_list, block_Duplicate( p_sys->pp_pps[i] ) );
744 p_sys->b_header = true;
746 block_ChainAppend( &p_list, p_sys->p_frame );
747 p_pic = block_ChainGather( p_list );
751 p_pic = block_ChainGather( p_sys->p_frame );
753 p_pic->i_dts = p_sys->i_frame_dts;
754 p_pic->i_pts = p_sys->i_frame_pts;
755 p_pic->i_length = 0; /* FIXME */
756 p_pic->i_flags |= p_sys->slice.i_frame_type;
758 p_sys->slice.i_frame_type = 0;
759 p_sys->p_frame = NULL;
760 p_sys->i_frame_dts = -1;
761 p_sys->i_frame_pts = -1;
762 p_sys->b_slice = false;
767 static void PutSPS( decoder_t *p_dec, block_t *p_frag )
769 decoder_sys_t *p_sys = p_dec->p_sys;
771 uint8_t *pb_dec = NULL;
777 CreateDecodedNAL( &pb_dec, &i_dec, &p_frag->p_buffer[5],
778 p_frag->i_buffer - 5 );
780 bs_init( &s, pb_dec, i_dec );
781 int i_profile_idc = bs_read( &s, 8 );
782 /* Skip constraint_set0123, reserved(4), level(8) */
783 bs_skip( &s, 1+1+1+1 + 4 + 8 );
785 i_sps_id = bs_read_ue( &s );
786 if( i_sps_id >= SPS_MAX )
788 msg_Warn( p_dec, "invalid SPS (sps_id=%d)", i_sps_id );
790 block_Release( p_frag );
794 if( i_profile_idc == 100 || i_profile_idc == 110 ||
795 i_profile_idc == 122 || i_profile_idc == 244 ||
796 i_profile_idc == 44 || i_profile_idc == 83 ||
797 i_profile_idc == 86 )
799 /* chroma_format_idc */
800 const int i_chroma_format_idc = bs_read_ue( &s );
801 if( i_chroma_format_idc == 3 )
802 bs_skip( &s, 1 ); /* seperate_colour_plane_flag */
803 /* bit_depth_luma_minus8 */
805 /* bit_depth_chroma_minus8 */
807 /* qpprime_y_zero_transform_bypass_flag */
809 /* seq_scaling_matrix_present_flag */
810 i_tmp = bs_read( &s, 1 );
813 for( int i = 0; i < ((3 != i_chroma_format_idc) ? 8 : 12); i++ )
815 /* seq_scaling_list_present_flag[i] */
816 i_tmp = bs_read( &s, 1 );
819 const int i_size_of_scaling_list = (i < 6 ) ? 16 : 64;
820 /* scaling_list (...) */
823 for( int j = 0; j < i_size_of_scaling_list; j++ )
825 if( i_nextscale != 0 )
828 i_tmp = bs_read( &s, 1 );
829 i_nextscale = ( i_lastscale + i_tmp + 256 ) % 256;
830 /* useDefaultScalingMatrixFlag = ... */
833 i_lastscale = ( i_nextscale == 0 ) ? i_lastscale : i_nextscale;
839 /* Skip i_log2_max_frame_num */
840 p_sys->i_log2_max_frame_num = bs_read_ue( &s );
841 if( p_sys->i_log2_max_frame_num > 12)
842 p_sys->i_log2_max_frame_num = 12;
844 p_sys->i_pic_order_cnt_type = bs_read_ue( &s );
845 if( p_sys->i_pic_order_cnt_type == 0 )
847 /* skip i_log2_max_poc_lsb */
848 p_sys->i_log2_max_pic_order_cnt_lsb = bs_read_ue( &s );
849 if( p_sys->i_log2_max_pic_order_cnt_lsb > 12 )
850 p_sys->i_log2_max_pic_order_cnt_lsb = 12;
852 else if( p_sys->i_pic_order_cnt_type == 1 )
855 /* skip b_delta_pic_order_always_zero */
856 p_sys->i_delta_pic_order_always_zero_flag = bs_read( &s, 1 );
857 /* skip i_offset_for_non_ref_pic */
859 /* skip i_offset_for_top_to_bottom_field */
861 /* read i_num_ref_frames_in_poc_cycle */
862 i_cycle = bs_read_ue( &s );
863 if( i_cycle > 256 ) i_cycle = 256;
866 /* skip i_offset_for_ref_frame */
871 /* i_num_ref_frames */
873 /* b_gaps_in_frame_num_value_allowed */
877 p_dec->fmt_out.video.i_width = 16 * ( bs_read_ue( &s ) + 1 );
878 p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );
880 /* b_frame_mbs_only */
881 p_sys->b_frame_mbs_only = bs_read( &s, 1 );
882 if( p_sys->b_frame_mbs_only == 0 )
886 /* b_direct8x8_inference */
890 i_tmp = bs_read( &s, 1 );
904 i_tmp = bs_read( &s, 1 );
907 /* read the aspect ratio part if any */
908 i_tmp = bs_read( &s, 1 );
911 static const struct { int w, h; } sar[17] =
913 { 0, 0 }, { 1, 1 }, { 12, 11 }, { 10, 11 },
914 { 16, 11 }, { 40, 33 }, { 24, 11 }, { 20, 11 },
915 { 32, 11 }, { 80, 33 }, { 18, 11 }, { 15, 11 },
916 { 64, 33 }, { 160,99 }, { 4, 3 }, { 3, 2 },
919 int i_sar = bs_read( &s, 8 );
927 else if( i_sar == 255 )
929 w = bs_read( &s, 16 );
930 h = bs_read( &s, 16 );
939 p_dec->fmt_out.video.i_aspect = (int64_t)VOUT_ASPECT_FACTOR *
940 ( w * p_dec->fmt_out.video.i_width ) /
941 ( h * p_dec->fmt_out.video.i_height);
943 p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR;
949 /* We have a new SPS */
951 msg_Dbg( p_dec, "found NAL_SPS (sps_id=%d)", i_sps_id );
954 if( p_sys->pp_sps[i_sps_id] )
955 block_Release( p_sys->pp_sps[i_sps_id] );
956 p_sys->pp_sps[i_sps_id] = p_frag;
959 static void PutPPS( decoder_t *p_dec, block_t *p_frag )
961 decoder_sys_t *p_sys = p_dec->p_sys;
966 bs_init( &s, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
967 i_pps_id = bs_read_ue( &s ); // pps id
968 i_sps_id = bs_read_ue( &s ); // sps id
969 if( i_pps_id >= PPS_MAX || i_sps_id >= SPS_MAX )
971 msg_Warn( p_dec, "invalid PPS (pps_id=%d sps_id=%d)", i_pps_id, i_sps_id );
972 block_Release( p_frag );
975 bs_skip( &s, 1 ); // entropy coding mode flag
976 p_sys->i_pic_order_present_flag = bs_read( &s, 1 );
979 /* We have a new PPS */
981 msg_Dbg( p_dec, "found NAL_PPS (pps_id=%d sps_id=%d)", i_pps_id, i_sps_id );
984 if( p_sys->pp_pps[i_pps_id] )
985 block_Release( p_sys->pp_pps[i_pps_id] );
986 p_sys->pp_pps[i_pps_id] = p_frag;
989 static void ParseSlice( decoder_t *p_dec, bool *pb_new_picture, slice_t *p_slice,
990 int i_nal_ref_idc, int i_nal_type, const block_t *p_frag )
992 decoder_sys_t *p_sys = p_dec->p_sys;
995 int i_first_mb, i_slice_type;
999 /* do not convert the whole frame */
1000 CreateDecodedNAL( &pb_dec, &i_dec, &p_frag->p_buffer[5],
1001 __MIN( p_frag->i_buffer - 5, 60 ) );
1002 bs_init( &s, pb_dec, i_dec );
1004 /* first_mb_in_slice */
1005 i_first_mb = bs_read_ue( &s );
1008 switch( (i_slice_type = bs_read_ue( &s )) )
1011 slice.i_frame_type = BLOCK_FLAG_TYPE_P;
1014 slice.i_frame_type = BLOCK_FLAG_TYPE_B;
1017 slice.i_frame_type = BLOCK_FLAG_TYPE_I;
1019 case 3: case 8: /* SP */
1020 slice.i_frame_type = BLOCK_FLAG_TYPE_P;
1023 slice.i_frame_type = BLOCK_FLAG_TYPE_I;
1026 slice.i_frame_type = 0;
1031 slice.i_nal_type = i_nal_type;
1032 slice.i_nal_ref_idc = i_nal_ref_idc;
1034 slice.i_pic_parameter_set_id = bs_read_ue( &s );
1035 slice.i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );
1037 slice.i_field_pic_flag = 0;
1038 slice.i_bottom_field_flag = -1;
1039 if( !p_sys->b_frame_mbs_only )
1041 /* field_pic_flag */
1042 slice.i_field_pic_flag = bs_read( &s, 1 );
1043 if( slice.i_field_pic_flag )
1044 slice.i_bottom_field_flag = bs_read( &s, 1 );
1047 slice.i_idr_pic_id = p_sys->slice.i_idr_pic_id;
1048 if( slice.i_nal_type == NAL_SLICE_IDR )
1049 slice.i_idr_pic_id = bs_read_ue( &s );
1051 slice.i_pic_order_cnt_lsb = -1;
1052 slice.i_delta_pic_order_cnt_bottom = -1;
1053 slice.i_delta_pic_order_cnt0 = 0;
1054 slice.i_delta_pic_order_cnt1 = 0;
1055 if( p_sys->i_pic_order_cnt_type == 0 )
1057 slice.i_pic_order_cnt_lsb = bs_read( &s, p_sys->i_log2_max_pic_order_cnt_lsb + 4 );
1058 if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
1059 slice.i_delta_pic_order_cnt_bottom = bs_read_se( &s );
1061 else if( (p_sys->i_pic_order_cnt_type == 1) &&
1062 (!p_sys->i_delta_pic_order_always_zero_flag) )
1064 slice.i_delta_pic_order_cnt0 = bs_read_se( &s );
1065 if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
1066 slice.i_delta_pic_order_cnt1 = bs_read_se( &s );
1070 /* Detection of the first VCL NAL unit of a primary coded picture
1071 * (cf. 7.4.1.2.4) */
1073 if( slice.i_frame_num != p_sys->slice.i_frame_num ||
1074 slice.i_pic_parameter_set_id != p_sys->slice.i_pic_parameter_set_id ||
1075 slice.i_field_pic_flag != p_sys->slice.i_field_pic_flag ||
1076 slice.i_nal_ref_idc != p_sys->slice.i_nal_ref_idc )
1078 if( (slice.i_bottom_field_flag != -1) &&
1079 (p_sys->slice.i_bottom_field_flag != -1) &&
1080 (slice.i_bottom_field_flag != p_sys->slice.i_bottom_field_flag) )
1082 if( p_sys->i_pic_order_cnt_type == 0 &&
1083 ( slice.i_pic_order_cnt_lsb != p_sys->slice.i_pic_order_cnt_lsb ||
1084 slice.i_delta_pic_order_cnt_bottom != p_sys->slice.i_delta_pic_order_cnt_bottom ) )
1086 else if( p_sys->i_pic_order_cnt_type == 1 &&
1087 ( slice.i_delta_pic_order_cnt0 != p_sys->slice.i_delta_pic_order_cnt0 ||
1088 slice.i_delta_pic_order_cnt1 != p_sys->slice.i_delta_pic_order_cnt1 ) )
1090 if( ( slice.i_nal_type == NAL_SLICE_IDR || p_sys->slice.i_nal_type == NAL_SLICE_IDR ) &&
1091 ( slice.i_nal_type != p_sys->slice.i_nal_type || slice.i_idr_pic_id != p_sys->slice.i_idr_pic_id ) )
1095 *pb_new_picture = b_pic;