cc233ce79c58bec5e4df1202862fe918c12fa5f5
[vlc.git] / modules / packetizer / h264.c
1 /*****************************************************************************
2  * h264.c: h264/avc video packetizer
3  *****************************************************************************
4  * Copyright (C) 2001, 2002, 2006 the VideoLAN team
5  * $Id$
6  *
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>
11  *
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.
16  *
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.
21  *
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  *****************************************************************************/
26
27 /*****************************************************************************
28  * Preamble
29  *****************************************************************************/
30
31 #ifdef HAVE_CONFIG_H
32 # include "config.h"
33 #endif
34
35 #include <vlc/vlc.h>
36 #include <vlc_plugin.h>
37 #include <vlc_sout.h>
38 #include <vlc_codec.h>
39 #include <vlc_block.h>
40
41 #include "vlc_block_helper.h"
42 #include "vlc_bits.h"
43
44 /*****************************************************************************
45  * Module descriptor
46  *****************************************************************************/
47 static int  Open ( vlc_object_t * );
48 static void Close( vlc_object_t * );
49
50 vlc_module_begin();
51     set_category( CAT_SOUT );
52     set_subcategory( SUBCAT_SOUT_PACKETIZER );
53     set_description( _("H.264 video packetizer") );
54     set_capability( "packetizer", 50 );
55     set_callbacks( Open, Close );
56 vlc_module_end();
57
58
59 /****************************************************************************
60  * Local prototypes
61  ****************************************************************************/
62 static block_t *Packetize( decoder_t *, block_t ** );
63 static block_t *PacketizeAVC1( decoder_t *, block_t ** );
64
65 typedef struct
66 {
67     int i_nal_type;
68     int i_nal_ref_idc;
69
70     int i_frame_type;
71     int i_pic_parameter_set_id;
72     int i_frame_num;
73
74     int i_field_pic_flag;
75     int i_bottom_field_flag;
76
77     int i_idr_pic_id;
78
79     int i_pic_order_cnt_lsb;
80     int i_delta_pic_order_cnt_bottom;
81
82     int i_delta_pic_order_cnt0;
83     int i_delta_pic_order_cnt1;
84 } slice_t;
85
86 struct decoder_sys_t
87 {
88     block_bytestream_t bytestream;
89
90     int     i_state;
91     size_t  i_offset;
92     uint8_t startcode[4];
93
94     bool b_slice;
95     block_t    *p_frame;
96
97     bool   b_sps;
98     bool   b_pps;
99     bool   b_header;
100
101     /* avcC data */
102     int i_avcC_length_size;
103     block_t *p_sps;
104     block_t *p_pps;
105
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;
112
113     /* Value from Picture Parameter Set */
114     int i_pic_order_present_flag;
115
116     /* Useful values of the Slice Header */
117     slice_t slice;
118 };
119
120 enum
121 {
122     STATE_NOSYNC,
123     STATE_NEXT_SYNC,
124 };
125
126 enum nal_unit_type_e
127 {
128     NAL_UNKNOWN = 0,
129     NAL_SLICE   = 1,
130     NAL_SLICE_DPA   = 2,
131     NAL_SLICE_DPB   = 3,
132     NAL_SLICE_DPC   = 4,
133     NAL_SLICE_IDR   = 5,    /* ref_idc != 0 */
134     NAL_SEI         = 6,    /* ref_idc == 0 */
135     NAL_SPS         = 7,
136     NAL_PPS         = 8,
137     NAL_AU_DELIMITER= 9
138     /* ref_idc == 0 for 6,9,10,11,12 */
139 };
140
141 enum nal_priority_e
142 {
143     NAL_PRIORITY_DISPOSABLE = 0,
144     NAL_PRIORITY_LOW        = 1,
145     NAL_PRIORITY_HIGH       = 2,
146     NAL_PRIORITY_HIGHEST    = 3,
147 };
148
149 static block_t *ParseNALBlock( decoder_t *, block_t * );
150
151 static block_t *nal_get_annexeb( decoder_t *, uint8_t *p, int );
152
153 /*****************************************************************************
154  * Open: probe the packetizer and return score
155  * When opening after demux, the packetizer is only loaded AFTER the decoder
156  * That means that what you set in fmt_out is ignored by the decoder in this special case
157  *****************************************************************************/
158 static int Open( vlc_object_t *p_this )
159 {
160     decoder_t     *p_dec = (decoder_t*)p_this;
161     decoder_sys_t *p_sys;
162
163     if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'h', '2', '6', '4') &&
164         p_dec->fmt_in.i_codec != VLC_FOURCC( 'H', '2', '6', '4') &&
165         p_dec->fmt_in.i_codec != VLC_FOURCC( 'V', 'S', 'S', 'H') &&
166         p_dec->fmt_in.i_codec != VLC_FOURCC( 'v', 's', 's', 'h') &&
167         p_dec->fmt_in.i_codec != VLC_FOURCC( 'D', 'A', 'V', 'C') &&
168         ( p_dec->fmt_in.i_codec != VLC_FOURCC( 'a', 'v', 'c', '1') ||
169           p_dec->fmt_in.i_extra < 7 ) )
170     {
171         return VLC_EGENERIC;
172     }
173
174     /* Allocate the memory needed to store the decoder's structure */
175     if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
176     {
177         msg_Err( p_dec, "out of memory" );
178         return VLC_EGENERIC;
179     }
180     p_sys->i_state = STATE_NOSYNC;
181     p_sys->i_offset = 0;
182     p_sys->startcode[0] = 0;
183     p_sys->startcode[1] = 0;
184     p_sys->startcode[2] = 0;
185     p_sys->startcode[3] = 1;
186     p_sys->bytestream = block_BytestreamInit();
187     p_sys->b_slice = false;
188     p_sys->p_frame = NULL;
189     p_sys->b_sps   = false;
190     p_sys->b_pps   = false;
191     p_sys->p_sps   = 0;
192     p_sys->p_pps   = 0;
193     p_sys->b_header= false;
194
195     p_sys->slice.i_nal_type = -1;
196     p_sys->slice.i_nal_ref_idc = -1;
197     p_sys->slice.i_idr_pic_id = -1;
198     p_sys->slice.i_frame_num = -1;
199     p_sys->slice.i_frame_type = 0;
200     p_sys->slice.i_pic_parameter_set_id = -1;
201     p_sys->slice.i_field_pic_flag = 0;
202     p_sys->slice.i_bottom_field_flag = -1;
203     p_sys->slice.i_pic_order_cnt_lsb = -1;
204     p_sys->slice.i_delta_pic_order_cnt_bottom = -1;
205
206     /* Setup properties */
207     es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
208     p_dec->fmt_out.i_codec = VLC_FOURCC( 'h', '2', '6', '4' );
209
210     if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
211     {
212         /* This type of stream is produced by mp4 and matroska
213          * when we want to store it in another streamformat, you need to convert
214          * The fmt_in.p_extra should ALWAYS contain the avcC
215          * The fmt_out.p_extra should contain all the SPS and PPS with 4 byte startcodes */
216         uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
217         int i_sps, i_pps;
218         int i;
219
220         /* Parse avcC */
221         p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
222
223         /* Read SPS */
224         i_sps = (*p++)&0x1f;
225         for( i = 0; i < i_sps; i++ )
226         {
227             uint16_t i_length = GetWBE( p ); p += 2;
228             if( i_length >
229                 (uint8_t*)p_dec->fmt_in.p_extra + p_dec->fmt_in.i_extra - p )
230             {
231                 return VLC_EGENERIC;
232             }
233             block_t *p_sps = nal_get_annexeb( p_dec, p, i_length );
234             if( !p_sps )
235                 return VLC_EGENERIC;
236             p_sys->p_sps = block_Duplicate( p_sps );
237             p_sps->i_pts = p_sps->i_dts = mdate();
238             ParseNALBlock( p_dec, p_sps );
239             p += i_length;
240         }
241         /* Read PPS */
242         i_pps = *p++;
243         for( i = 0; i < i_pps; i++ )
244         {
245             uint16_t i_length = GetWBE( p ); p += 2;
246             if( i_length >
247                 (uint8_t*)p_dec->fmt_in.p_extra + p_dec->fmt_in.i_extra - p )
248             {
249                 return VLC_EGENERIC;
250             }
251             block_t *p_pps = nal_get_annexeb( p_dec, p, i_length );
252             if( !p_pps )
253                 return VLC_EGENERIC;
254             p_sys->p_pps = block_Duplicate( p_pps );
255             p_pps->i_pts = p_pps->i_dts = mdate();
256             ParseNALBlock( p_dec, p_pps );
257             p += i_length;
258         }
259         msg_Dbg( p_dec, "avcC length size=%d, sps=%d, pps=%d",
260                  p_sys->i_avcC_length_size, i_sps, i_pps );
261
262         /* FIXME: FFMPEG isn't happy at all if you leave this */
263         if( p_dec->fmt_out.i_extra ) free( p_dec->fmt_out.p_extra );
264         p_dec->fmt_out.i_extra = 0; p_dec->fmt_out.p_extra = NULL;
265
266         /* Set the new extradata */
267         p_dec->fmt_out.i_extra = p_sys->p_pps->i_buffer + p_sys->p_sps->i_buffer;
268         p_dec->fmt_out.p_extra = (uint8_t*)malloc( p_dec->fmt_out.i_extra );
269         if( p_dec->fmt_out.p_extra )
270         {
271             memcpy( (uint8_t*)p_dec->fmt_out.p_extra, p_sys->p_sps->p_buffer, p_sys->p_sps->i_buffer);
272             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);
273             p_sys->b_header = true;
274         }
275         else p_dec->fmt_out.i_extra = 0;
276
277         /* Set callback */
278         p_dec->pf_packetize = PacketizeAVC1;
279     }
280     else
281     {
282         /* This type of stream contains data with 3 of 4 byte startcodes
283          * The fmt_in.p_extra MAY contain SPS/PPS with 4 byte startcodes
284          * The fmt_out.p_extra should be the same */
285  
286         /* Set callback */
287         p_dec->pf_packetize = Packetize;
288
289         /* */
290         if( p_dec->fmt_in.i_extra > 0 )
291         {
292             block_t *p_init = block_New( p_dec, p_dec->fmt_in.i_extra );
293             block_t *p_pic;
294
295             memcpy( p_init->p_buffer, p_dec->fmt_in.p_extra,
296                     p_dec->fmt_in.i_extra );
297
298             while( ( p_pic = Packetize( p_dec, &p_init ) ) )
299             {
300                 /* Should not occur because we should only receive SPS/PPS */
301                 block_Release( p_pic );
302             }
303         }
304     }
305
306     return VLC_SUCCESS;
307 }
308
309 /*****************************************************************************
310  * Close: clean up the packetizer
311  *****************************************************************************/
312 static void Close( vlc_object_t *p_this )
313 {
314     decoder_t *p_dec = (decoder_t*)p_this;
315     decoder_sys_t *p_sys = p_dec->p_sys;
316
317     if( p_sys->p_frame ) block_ChainRelease( p_sys->p_frame );
318     if( p_sys->p_sps ) block_Release( p_sys->p_sps );
319     if( p_sys->p_pps ) block_Release( p_sys->p_pps );
320     block_BytestreamRelease( &p_sys->bytestream );
321     free( p_sys );
322 }
323
324 /****************************************************************************
325  * Packetize: the whole thing
326  * Search for the startcodes 3 or more bytes
327  * Feed ParseNALBlock ALWAYS with 4 byte startcode prepended NALs
328  ****************************************************************************/
329 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
330 {
331     decoder_sys_t *p_sys = p_dec->p_sys;
332     block_t       *p_pic;
333
334     if( !pp_block || !*pp_block )
335         return NULL;
336
337     if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
338     {
339         if( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED )
340         {
341             p_sys->i_state = STATE_NOSYNC;
342             block_BytestreamFlush( &p_sys->bytestream );
343
344             if( p_sys->p_frame )
345                 block_ChainRelease( p_sys->p_frame );
346             p_sys->p_frame = NULL;
347             p_sys->slice.i_frame_type = 0;
348             p_sys->b_slice = false;
349         }
350         block_Release( *pp_block );
351         return NULL;
352     }
353
354     block_BytestreamPush( &p_sys->bytestream, *pp_block );
355
356     for( ;; )
357     {
358         switch( p_sys->i_state )
359         {
360             case STATE_NOSYNC:
361                 /* Skip until 3 byte startcode 0 0 1 */
362                 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
363                       &p_sys->i_offset, p_sys->startcode+1, 3 ) == VLC_SUCCESS)
364                 {
365                     p_sys->i_state = STATE_NEXT_SYNC;
366                 }
367
368                 if( p_sys->i_offset )
369                 {
370                     /* skip the data */
371                     block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
372                     p_sys->i_offset = 0;
373                     block_BytestreamFlush( &p_sys->bytestream );
374                 }
375
376                 if( p_sys->i_state != STATE_NEXT_SYNC )
377                 {
378                     /* Need more data */
379                     return NULL;
380                 }
381
382                 p_sys->i_offset = 1; /* To find next startcode */
383
384             case STATE_NEXT_SYNC:
385                 /* Find the next 3 byte startcode 0 0 1*/
386                 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
387                       &p_sys->i_offset, p_sys->startcode+1, 3 ) != VLC_SUCCESS)
388                 {
389                     /* Need more data */
390                     return NULL;
391                 }
392
393                 /* Get the new fragment and set the pts/dts */
394                 p_pic = block_New( p_dec, p_sys->i_offset +1 );
395                 p_pic->i_pts = p_sys->bytestream.p_block->i_pts;
396                 p_pic->i_dts = p_sys->bytestream.p_block->i_dts;
397                 /* Force 4 byte startcode 0 0 0 1 */
398                 p_pic->p_buffer[0] = 0;
399
400                 block_GetBytes( &p_sys->bytestream, &p_pic->p_buffer[1],
401                                 p_pic->i_buffer-1 );
402
403                 /* Remove trailing 0 bytes */
404                 while( p_pic->i_buffer && (!p_pic->p_buffer[p_pic->i_buffer-1] ) )
405                     p_pic->i_buffer--;
406                 p_sys->i_offset = 0;
407
408                 /* Parse the NAL */
409                 if( !( p_pic = ParseNALBlock( p_dec, p_pic ) ) )
410                 {
411                     p_sys->i_state = STATE_NOSYNC;
412                     break;
413                 }
414 #if 0
415                 msg_Dbg( p_dec, "pts=%"PRId64" dts=%"PRId64,
416                          p_pic->i_pts, p_pic->i_dts );
417 #endif
418
419                 /* So p_block doesn't get re-added several times */
420                 *pp_block = block_BytestreamPop( &p_sys->bytestream );
421
422                 p_sys->i_state = STATE_NOSYNC;
423
424                 return p_pic;
425         }
426     }
427 }
428
429 /****************************************************************************
430  * PacketizeAVC1: Takes VCL blocks of data and creates annexe B type NAL stream
431  * Will always use 4 byte 0 0 0 1 startcodes
432  * Will prepend a SPS and PPS before each keyframe
433  ****************************************************************************/
434 static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
435 {
436     decoder_sys_t *p_sys = p_dec->p_sys;
437     block_t       *p_block;
438     block_t       *p_ret = NULL;
439     uint8_t       *p;
440
441     if( !pp_block || !*pp_block )
442         return NULL;
443     if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
444     {
445         block_Release( *pp_block );
446         return NULL;
447     }
448
449     p_block = *pp_block;
450     *pp_block = NULL;
451
452     for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
453     {
454         block_t *p_pic;
455         int i_size = 0;
456         int i;
457
458         for( i = 0; i < p_sys->i_avcC_length_size; i++ )
459         {
460             i_size = (i_size << 8) | (*p++);
461         }
462
463         if( i_size <= 0 ||
464             i_size > ( p_block->p_buffer + p_block->i_buffer - p ) )
465         {
466             msg_Err( p_dec, "Broken frame : size %d is too big", i_size );
467             break;
468         }
469
470         block_t *p_part = nal_get_annexeb( p_dec, p, i_size );
471         if( !p_part )
472             break;
473         p_part->i_dts = p_block->i_dts;
474         p_part->i_pts = p_block->i_pts;
475
476         /* Parse the NAL */
477         if( ( p_pic = ParseNALBlock( p_dec, p_part ) ) )
478         {
479             block_ChainAppend( &p_ret, p_pic );
480         }
481         p += i_size;
482     }
483     block_Release( p_block );
484
485     return p_ret;
486 }
487
488 static block_t *nal_get_annexeb( decoder_t *p_dec, uint8_t *p, int i_size )
489 {
490     block_t *p_nal;
491
492     p_nal = block_New( p_dec, 4 + i_size );
493     if( !p_nal ) return NULL;
494
495     /* Add start code */
496     p_nal->p_buffer[0] = 0x00;
497     p_nal->p_buffer[1] = 0x00;
498     p_nal->p_buffer[2] = 0x00;
499     p_nal->p_buffer[3] = 0x01;
500
501     /* Copy nalu */
502     memcpy( &p_nal->p_buffer[4], p, i_size );
503
504     return p_nal;
505 }
506
507 static void nal_get_decoded( uint8_t **pp_ret, int *pi_ret,
508                              uint8_t *src, int i_src )
509 {
510     uint8_t *end = &src[i_src];
511     uint8_t *dst = malloc( i_src );
512
513     *pp_ret = dst;
514
515     if( dst )
516     {
517         while( src < end )
518         {
519             if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
520                 src[2] == 0x03 )
521             {
522                 *dst++ = 0x00;
523                 *dst++ = 0x00;
524
525                 src += 3;
526                 continue;
527             }
528             *dst++ = *src++;
529         }
530     }
531     *pi_ret = dst - *pp_ret;
532 }
533
534 static inline int bs_read_ue( bs_t *s )
535 {
536     int i = 0;
537
538     while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
539     {
540         i++;
541     }
542     return( ( 1 << i) - 1 + bs_read( s, i ) );
543 }
544
545 static inline int bs_read_se( bs_t *s )
546 {
547     int val = bs_read_ue( s );
548
549     return val&0x01 ? (val+1)/2 : -(val/2);
550 }
551
552 /*****************************************************************************
553  * ParseNALBlock: parses annexB type NALs
554  * All p_frag blocks are required to start with 0 0 0 1 4-byte startcode
555  *****************************************************************************/
556 static block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
557 {
558     decoder_sys_t *p_sys = p_dec->p_sys;
559     block_t *p_pic = NULL;
560
561     const int i_nal_ref_idc = (p_frag->p_buffer[4] >> 5)&0x03;
562     const int i_nal_type = p_frag->p_buffer[4]&0x1f;
563
564 #define OUTPUT \
565     do {                                                      \
566         if( !p_sys->b_header && p_sys->slice.i_frame_type != BLOCK_FLAG_TYPE_I) \
567             break;                                            \
568                                                               \
569         if( p_sys->slice.i_frame_type == BLOCK_FLAG_TYPE_I && p_sys->p_sps && p_sys->p_pps ) \
570         { \
571             block_t *p_sps = block_Duplicate( p_sys->p_sps ); \
572             block_t *p_pps = block_Duplicate( p_sys->p_pps ); \
573             p_sps->i_dts = p_sys->p_frame->i_dts;           \
574             p_sps->i_pts = p_sys->p_frame->i_pts;           \
575             block_ChainAppend( &p_sps, p_pps );               \
576             block_ChainAppend( &p_sps, p_sys->p_frame );      \
577             p_sys->b_header = true;                       \
578             p_pic = block_ChainGather( p_sps );               \
579         } else { \
580             p_pic = block_ChainGather( p_sys->p_frame ); \
581         } \
582         p_pic->i_length = 0;    /* FIXME */                   \
583         p_pic->i_flags |= p_sys->slice.i_frame_type;          \
584             \
585         p_sys->slice.i_frame_type = 0;                        \
586         p_sys->p_frame = NULL;                                \
587         p_sys->b_slice = false;                           \
588     } while(0)
589
590     if( p_sys->b_slice && ( !p_sys->b_sps || !p_sys->b_pps ) )
591     {
592         block_ChainRelease( p_sys->p_frame );
593         msg_Warn( p_dec, "waiting for SPS/PPS" );
594
595         /* Reset context */
596         p_sys->slice.i_frame_type = 0;
597         p_sys->p_frame = NULL;
598         p_sys->b_slice = false;
599     }
600
601     if( ( !p_sys->b_sps || !p_sys->b_pps ) &&
602         i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
603     {
604         p_sys->b_slice = true;
605         /* Fragment will be discarded later on */
606     }
607     else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
608     {
609         uint8_t *dec = NULL;
610         int i_dec = 0, i_first_mb, i_slice_type;
611         slice_t slice;
612         bool b_pic;
613         bs_t s;
614
615         /* do not convert the whole frame */
616         nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
617                          __MIN( p_frag->i_buffer - 5, 60 ) );
618         bs_init( &s, dec, i_dec );
619
620         /* first_mb_in_slice */
621         i_first_mb = bs_read_ue( &s );
622
623         /* slice_type */
624         switch( (i_slice_type = bs_read_ue( &s )) )
625         {
626         case 0: case 5:
627             slice.i_frame_type = BLOCK_FLAG_TYPE_P;
628             break;
629         case 1: case 6:
630             slice.i_frame_type = BLOCK_FLAG_TYPE_B;
631             break;
632         case 2: case 7:
633             slice.i_frame_type = BLOCK_FLAG_TYPE_I;
634             break;
635         case 3: case 8: /* SP */
636             slice.i_frame_type = BLOCK_FLAG_TYPE_P;
637             break;
638         case 4: case 9:
639             slice.i_frame_type = BLOCK_FLAG_TYPE_I;
640             break;
641         default:
642             slice.i_frame_type = 0;
643             break;
644         }
645
646         /* */
647         slice.i_nal_type = i_nal_type;
648         slice.i_nal_ref_idc = i_nal_ref_idc;
649
650         slice.i_pic_parameter_set_id = bs_read_ue( &s );
651         slice.i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );
652
653         slice.i_field_pic_flag = 0;
654         slice.i_bottom_field_flag = -1;
655         if( !p_sys->b_frame_mbs_only )
656         {
657             /* field_pic_flag */
658             slice.i_field_pic_flag = bs_read( &s, 1 );
659             if( slice.i_field_pic_flag )
660                 slice.i_bottom_field_flag = bs_read( &s, 1 );
661         }
662
663         slice.i_idr_pic_id = p_sys->slice.i_idr_pic_id;
664         if( slice.i_nal_type == NAL_SLICE_IDR )
665             slice.i_idr_pic_id = bs_read_ue( &s );
666
667         slice.i_pic_order_cnt_lsb = -1;
668         slice.i_delta_pic_order_cnt_bottom = -1;
669         slice.i_delta_pic_order_cnt0 = 0;
670         slice.i_delta_pic_order_cnt1 = 0;
671         if( p_sys->i_pic_order_cnt_type == 0 )
672         {
673             slice.i_pic_order_cnt_lsb = bs_read( &s, p_sys->i_log2_max_pic_order_cnt_lsb + 4 );
674             if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
675                 slice.i_delta_pic_order_cnt_bottom = bs_read_se( &s );
676         }
677         else if( (p_sys->i_pic_order_cnt_type == 1) &&
678                  (!p_sys->i_delta_pic_order_always_zero_flag) )
679         {
680             slice.i_delta_pic_order_cnt0 = bs_read_se( &s );
681             if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
682                 slice.i_delta_pic_order_cnt1 = bs_read_se( &s );
683         }
684
685         /* Detection of the first VCL NAL unit of a primary coded picture
686          * (cf. 7.4.1.2.4) */
687         b_pic = false;
688         if( slice.i_frame_num != p_sys->slice.i_frame_num ||
689             slice.i_pic_parameter_set_id != p_sys->slice.i_pic_parameter_set_id ||
690             slice.i_field_pic_flag != p_sys->slice.i_field_pic_flag ||
691             slice.i_nal_ref_idc != p_sys->slice.i_nal_ref_idc )
692             b_pic = true;
693         if( (slice.i_bottom_field_flag != -1) &&
694             (p_sys->slice.i_bottom_field_flag != -1) &&
695             (slice.i_bottom_field_flag != p_sys->slice.i_bottom_field_flag) )
696             b_pic = true;
697         if( p_sys->i_pic_order_cnt_type == 0 &&
698             ( slice.i_pic_order_cnt_lsb != p_sys->slice.i_pic_order_cnt_lsb ||
699               slice.i_delta_pic_order_cnt_bottom != p_sys->slice.i_delta_pic_order_cnt_bottom ) )
700             b_pic = true;
701         else if( p_sys->i_pic_order_cnt_type == 1 &&
702                  ( slice.i_delta_pic_order_cnt0 != p_sys->slice.i_delta_pic_order_cnt0 ||
703                    slice.i_delta_pic_order_cnt1 != p_sys->slice.i_delta_pic_order_cnt1 ) )
704             b_pic = true;
705         if( ( slice.i_nal_type == NAL_SLICE_IDR || p_sys->slice.i_nal_type == NAL_SLICE_IDR ) &&
706             ( slice.i_nal_type != p_sys->slice.i_nal_type || slice.i_idr_pic_id != p_sys->slice.i_idr_pic_id ) )
707                 b_pic = true;
708
709         /* */
710         p_sys->slice = slice;
711
712         if( b_pic && p_sys->b_slice )
713             OUTPUT;
714
715         p_sys->b_slice = true;
716
717         free( dec );
718     }
719     else if( i_nal_type == NAL_SPS )
720     {
721         uint8_t *dec = NULL;
722         int     i_dec = 0;
723         bs_t s;
724         int i_tmp;
725
726         if( !p_sys->b_sps ) msg_Dbg( p_dec, "found NAL_SPS" );
727
728         p_sys->b_sps = true;
729
730         nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
731                          p_frag->i_buffer - 5 );
732
733         bs_init( &s, dec, i_dec );
734         /* Skip profile(8), constraint_set012, reserver(5), level(8) */
735         bs_skip( &s, 8 + 1+1+1 + 5 + 8 );
736         /* sps id */
737         bs_read_ue( &s );
738         /* Skip i_log2_max_frame_num */
739         p_sys->i_log2_max_frame_num = bs_read_ue( &s );
740         if( p_sys->i_log2_max_frame_num > 12)
741             p_sys->i_log2_max_frame_num = 12;
742         /* Read poc_type */
743         p_sys->i_pic_order_cnt_type = bs_read_ue( &s );
744         if( p_sys->i_pic_order_cnt_type == 0 )
745         {
746             /* skip i_log2_max_poc_lsb */
747             p_sys->i_log2_max_pic_order_cnt_lsb = bs_read_ue( &s );
748             if( p_sys->i_log2_max_pic_order_cnt_lsb > 12 )
749                 p_sys->i_log2_max_pic_order_cnt_lsb = 12;
750         }
751         else if( p_sys->i_pic_order_cnt_type == 1 )
752         {
753             int i_cycle;
754             /* skip b_delta_pic_order_always_zero */
755             p_sys->i_delta_pic_order_always_zero_flag = bs_read( &s, 1 );
756             /* skip i_offset_for_non_ref_pic */
757             bs_read_se( &s );
758             /* skip i_offset_for_top_to_bottom_field */
759             bs_read_se( &s );
760             /* read i_num_ref_frames_in_poc_cycle */
761             i_cycle = bs_read_ue( &s );
762             if( i_cycle > 256 ) i_cycle = 256;
763             while( i_cycle > 0 )
764             {
765                 /* skip i_offset_for_ref_frame */
766                 bs_read_se(&s );
767             }
768         }
769         /* i_num_ref_frames */
770         bs_read_ue( &s );
771         /* b_gaps_in_frame_num_value_allowed */
772         bs_skip( &s, 1 );
773
774         /* Read size */
775         p_dec->fmt_out.video.i_width  = 16 * ( bs_read_ue( &s ) + 1 );
776         p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );
777
778         /* b_frame_mbs_only */
779         p_sys->b_frame_mbs_only = bs_read( &s, 1 );
780         if( p_sys->b_frame_mbs_only == 0 )
781         {
782             bs_skip( &s, 1 );
783         }
784         /* b_direct8x8_inference */
785         bs_skip( &s, 1 );
786
787         /* crop */
788         i_tmp = bs_read( &s, 1 );
789         if( i_tmp )
790         {
791             /* left */
792             bs_read_ue( &s );
793             /* right */
794             bs_read_ue( &s );
795             /* top */
796             bs_read_ue( &s );
797             /* bottom */
798             bs_read_ue( &s );
799         }
800
801         /* vui */
802         i_tmp = bs_read( &s, 1 );
803         if( i_tmp )
804         {
805             /* read the aspect ratio part if any FIXME check it */
806             i_tmp = bs_read( &s, 1 );
807             if( i_tmp )
808             {
809                 static const struct { int w, h; } sar[14] =
810                 {
811                     { 0,   0 }, { 1,   1 }, { 12, 11 }, { 10, 11 },
812                     { 16, 11 }, { 40, 33 }, { 24, 11 }, { 20, 11 },
813                     { 32, 11 }, { 80, 33 }, { 18, 11 }, { 15, 11 },
814                     { 64, 33 }, { 160,99 },
815                 };
816                 int i_sar = bs_read( &s, 8 );
817                 int w, h;
818
819                 if( i_sar < 14 )
820                 {
821                     w = sar[i_sar].w;
822                     h = sar[i_sar].h;
823                 }
824                 else
825                 {
826                     w = bs_read( &s, 16 );
827                     h = bs_read( &s, 16 );
828                 }
829                 if( h != 0 )
830                     p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR * w /
831                         h * p_dec->fmt_out.video.i_width /
832                         p_dec->fmt_out.video.i_height;
833                 else
834                     p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR;
835             }
836         }
837
838         free( dec );
839
840         if( p_sys->b_slice ) OUTPUT;
841
842         /* We have a new SPS */
843         if( p_sys->p_sps ) block_Release( p_sys->p_sps );
844         p_sys->p_sps = p_frag;
845
846         /* Do not append the SPS because we will insert it on keyframes */
847         return p_pic;
848     }
849     else if( i_nal_type == NAL_PPS )
850     {
851         bs_t s;
852
853         bs_init( &s, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
854         bs_read_ue( &s ); // pps id
855         bs_read_ue( &s ); // sps id
856         bs_skip( &s, 1 ); // entropy coding mode flag
857         p_sys->i_pic_order_present_flag = bs_read( &s, 1 );
858
859         if( !p_sys->b_pps ) msg_Dbg( p_dec, "found NAL_PPS" );
860         p_sys->b_pps = true;
861
862         /* TODO */
863
864         if( p_sys->b_slice ) OUTPUT;
865
866         /* We have a new PPS */
867         if( p_sys->p_pps ) block_Release( p_sys->p_pps );
868         p_sys->p_pps = p_frag;
869
870         /* Do not append the PPS because we will insert it on keyframes */
871         return p_pic;
872     }
873     else if( i_nal_type == NAL_AU_DELIMITER ||
874              i_nal_type == NAL_SEI ||
875              ( i_nal_type >= 13 && i_nal_type <= 18 ) )
876     {
877         if( p_sys->b_slice ) OUTPUT;
878     }
879
880 #undef OUTPUT
881
882     /* Append the block */
883     block_ChainAppend( &p_sys->p_frame, p_frag );
884
885     return p_pic;
886 }