Remove "out of memory" message
[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         return VLC_ENOMEM;
178     }
179     p_sys->i_state = STATE_NOSYNC;
180     p_sys->i_offset = 0;
181     p_sys->startcode[0] = 0;
182     p_sys->startcode[1] = 0;
183     p_sys->startcode[2] = 0;
184     p_sys->startcode[3] = 1;
185     p_sys->bytestream = block_BytestreamInit();
186     p_sys->b_slice = false;
187     p_sys->p_frame = NULL;
188     p_sys->b_sps   = false;
189     p_sys->b_pps   = false;
190     p_sys->p_sps   = 0;
191     p_sys->p_pps   = 0;
192     p_sys->b_header= false;
193
194     p_sys->slice.i_nal_type = -1;
195     p_sys->slice.i_nal_ref_idc = -1;
196     p_sys->slice.i_idr_pic_id = -1;
197     p_sys->slice.i_frame_num = -1;
198     p_sys->slice.i_frame_type = 0;
199     p_sys->slice.i_pic_parameter_set_id = -1;
200     p_sys->slice.i_field_pic_flag = 0;
201     p_sys->slice.i_bottom_field_flag = -1;
202     p_sys->slice.i_pic_order_cnt_lsb = -1;
203     p_sys->slice.i_delta_pic_order_cnt_bottom = -1;
204
205     /* Setup properties */
206     es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
207     p_dec->fmt_out.i_codec = VLC_FOURCC( 'h', '2', '6', '4' );
208
209     if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
210     {
211         /* This type of stream is produced by mp4 and matroska
212          * when we want to store it in another streamformat, you need to convert
213          * The fmt_in.p_extra should ALWAYS contain the avcC
214          * The fmt_out.p_extra should contain all the SPS and PPS with 4 byte startcodes */
215         uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
216         int i_sps, i_pps;
217         int i;
218
219         /* Parse avcC */
220         p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
221
222         /* Read SPS */
223         i_sps = (*p++)&0x1f;
224         for( i = 0; i < i_sps; i++ )
225         {
226             uint16_t i_length = GetWBE( p ); p += 2;
227             if( i_length >
228                 (uint8_t*)p_dec->fmt_in.p_extra + p_dec->fmt_in.i_extra - p )
229             {
230                 return VLC_EGENERIC;
231             }
232             block_t *p_sps = nal_get_annexeb( p_dec, p, i_length );
233             if( !p_sps )
234                 return VLC_EGENERIC;
235             p_sys->p_sps = block_Duplicate( p_sps );
236             p_sps->i_pts = p_sps->i_dts = mdate();
237             ParseNALBlock( p_dec, p_sps );
238             p += i_length;
239         }
240         /* Read PPS */
241         i_pps = *p++;
242         for( i = 0; i < i_pps; i++ )
243         {
244             uint16_t i_length = GetWBE( p ); p += 2;
245             if( i_length >
246                 (uint8_t*)p_dec->fmt_in.p_extra + p_dec->fmt_in.i_extra - p )
247             {
248                 return VLC_EGENERIC;
249             }
250             block_t *p_pps = nal_get_annexeb( p_dec, p, i_length );
251             if( !p_pps )
252                 return VLC_EGENERIC;
253             p_sys->p_pps = block_Duplicate( p_pps );
254             p_pps->i_pts = p_pps->i_dts = mdate();
255             ParseNALBlock( p_dec, p_pps );
256             p += i_length;
257         }
258         msg_Dbg( p_dec, "avcC length size=%d, sps=%d, pps=%d",
259                  p_sys->i_avcC_length_size, i_sps, i_pps );
260
261         /* FIXME: FFMPEG isn't happy at all if you leave this */
262         if( p_dec->fmt_out.i_extra > 0 ) free( p_dec->fmt_out.p_extra );
263         p_dec->fmt_out.i_extra = 0;
264         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 = 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,
272                     p_sys->p_sps->p_buffer, p_sys->p_sps->i_buffer);
273             memcpy( (uint8_t*)p_dec->fmt_out.p_extra+p_sys->p_sps->i_buffer,
274                     p_sys->p_pps->p_buffer, p_sys->p_pps->i_buffer);
275             p_sys->b_header = true;
276         }
277         else p_dec->fmt_out.i_extra = 0;
278
279         /* Set callback */
280         p_dec->pf_packetize = PacketizeAVC1;
281     }
282     else
283     {
284         /* This type of stream contains data with 3 of 4 byte startcodes
285          * The fmt_in.p_extra MAY contain SPS/PPS with 4 byte startcodes
286          * The fmt_out.p_extra should be the same */
287  
288         /* Set callback */
289         p_dec->pf_packetize = Packetize;
290
291         /* */
292         if( p_dec->fmt_in.i_extra > 0 )
293         {
294             block_t *p_init = block_New( p_dec, p_dec->fmt_in.i_extra );
295             block_t *p_pic;
296
297             memcpy( p_init->p_buffer, p_dec->fmt_in.p_extra,
298                     p_dec->fmt_in.i_extra );
299
300             while( ( p_pic = Packetize( p_dec, &p_init ) ) )
301             {
302                 /* Should not occur because we should only receive SPS/PPS */
303                 block_Release( p_pic );
304             }
305         }
306     }
307
308     return VLC_SUCCESS;
309 }
310
311 /*****************************************************************************
312  * Close: clean up the packetizer
313  *****************************************************************************/
314 static void Close( vlc_object_t *p_this )
315 {
316     decoder_t *p_dec = (decoder_t*)p_this;
317     decoder_sys_t *p_sys = p_dec->p_sys;
318
319     if( p_sys->p_frame ) block_ChainRelease( p_sys->p_frame );
320     if( p_sys->p_sps ) block_Release( p_sys->p_sps );
321     if( p_sys->p_pps ) block_Release( p_sys->p_pps );
322     block_BytestreamRelease( &p_sys->bytestream );
323     free( p_sys );
324 }
325
326 /****************************************************************************
327  * Packetize: the whole thing
328  * Search for the startcodes 3 or more bytes
329  * Feed ParseNALBlock ALWAYS with 4 byte startcode prepended NALs
330  ****************************************************************************/
331 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
332 {
333     decoder_sys_t *p_sys = p_dec->p_sys;
334     block_t       *p_pic;
335
336     if( !pp_block || !*pp_block )
337         return NULL;
338
339     if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
340     {
341         if( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED )
342         {
343             p_sys->i_state = STATE_NOSYNC;
344             block_BytestreamFlush( &p_sys->bytestream );
345
346             if( p_sys->p_frame )
347                 block_ChainRelease( p_sys->p_frame );
348             p_sys->p_frame = NULL;
349             p_sys->slice.i_frame_type = 0;
350             p_sys->b_slice = false;
351         }
352         block_Release( *pp_block );
353         return NULL;
354     }
355
356     block_BytestreamPush( &p_sys->bytestream, *pp_block );
357
358     for( ;; )
359     {
360         switch( p_sys->i_state )
361         {
362             case STATE_NOSYNC:
363                 /* Skip until 3 byte startcode 0 0 1 */
364                 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
365                       &p_sys->i_offset, p_sys->startcode+1, 3 ) == VLC_SUCCESS)
366                 {
367                     p_sys->i_state = STATE_NEXT_SYNC;
368                 }
369
370                 if( p_sys->i_offset )
371                 {
372                     /* skip the data */
373                     block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
374                     p_sys->i_offset = 0;
375                     block_BytestreamFlush( &p_sys->bytestream );
376                 }
377
378                 if( p_sys->i_state != STATE_NEXT_SYNC )
379                 {
380                     /* Need more data */
381                     return NULL;
382                 }
383
384                 p_sys->i_offset = 1; /* To find next startcode */
385
386             case STATE_NEXT_SYNC:
387                 /* Find the next 3 byte startcode 0 0 1*/
388                 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
389                       &p_sys->i_offset, p_sys->startcode+1, 3 ) != VLC_SUCCESS)
390                 {
391                     /* Need more data */
392                     return NULL;
393                 }
394
395                 /* Get the new fragment and set the pts/dts */
396                 p_pic = block_New( p_dec, p_sys->i_offset +1 );
397                 p_pic->i_pts = p_sys->bytestream.p_block->i_pts;
398                 p_pic->i_dts = p_sys->bytestream.p_block->i_dts;
399                 /* Force 4 byte startcode 0 0 0 1 */
400                 p_pic->p_buffer[0] = 0;
401
402                 block_GetBytes( &p_sys->bytestream, &p_pic->p_buffer[1],
403                                 p_pic->i_buffer-1 );
404
405                 /* Remove trailing 0 bytes */
406                 while( p_pic->i_buffer && (!p_pic->p_buffer[p_pic->i_buffer-1] ) )
407                     p_pic->i_buffer--;
408                 p_sys->i_offset = 0;
409
410                 /* Parse the NAL */
411                 if( !( p_pic = ParseNALBlock( p_dec, p_pic ) ) )
412                 {
413                     p_sys->i_state = STATE_NOSYNC;
414                     break;
415                 }
416 #if 0
417                 msg_Dbg( p_dec, "pts=%"PRId64" dts=%"PRId64,
418                          p_pic->i_pts, p_pic->i_dts );
419 #endif
420
421                 /* So p_block doesn't get re-added several times */
422                 *pp_block = block_BytestreamPop( &p_sys->bytestream );
423
424                 p_sys->i_state = STATE_NOSYNC;
425
426                 return p_pic;
427         }
428     }
429 }
430
431 /****************************************************************************
432  * PacketizeAVC1: Takes VCL blocks of data and creates annexe B type NAL stream
433  * Will always use 4 byte 0 0 0 1 startcodes
434  * Will prepend a SPS and PPS before each keyframe
435  ****************************************************************************/
436 static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
437 {
438     decoder_sys_t *p_sys = p_dec->p_sys;
439     block_t       *p_block;
440     block_t       *p_ret = NULL;
441     uint8_t       *p;
442
443     if( !pp_block || !*pp_block )
444         return NULL;
445     if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
446     {
447         block_Release( *pp_block );
448         return NULL;
449     }
450
451     p_block = *pp_block;
452     *pp_block = NULL;
453
454     for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
455     {
456         block_t *p_pic;
457         int i_size = 0;
458         int i;
459
460         for( i = 0; i < p_sys->i_avcC_length_size; i++ )
461         {
462             i_size = (i_size << 8) | (*p++);
463         }
464
465         if( i_size <= 0 ||
466             i_size > ( p_block->p_buffer + p_block->i_buffer - p ) )
467         {
468             msg_Err( p_dec, "Broken frame : size %d is too big", i_size );
469             break;
470         }
471
472         block_t *p_part = nal_get_annexeb( p_dec, p, i_size );
473         if( !p_part )
474             break;
475         p_part->i_dts = p_block->i_dts;
476         p_part->i_pts = p_block->i_pts;
477
478         /* Parse the NAL */
479         if( ( p_pic = ParseNALBlock( p_dec, p_part ) ) )
480         {
481             block_ChainAppend( &p_ret, p_pic );
482         }
483         p += i_size;
484     }
485     block_Release( p_block );
486
487     return p_ret;
488 }
489
490 static block_t *nal_get_annexeb( decoder_t *p_dec, uint8_t *p, int i_size )
491 {
492     block_t *p_nal;
493
494     p_nal = block_New( p_dec, 4 + i_size );
495     if( !p_nal ) return NULL;
496
497     /* Add start code */
498     p_nal->p_buffer[0] = 0x00;
499     p_nal->p_buffer[1] = 0x00;
500     p_nal->p_buffer[2] = 0x00;
501     p_nal->p_buffer[3] = 0x01;
502
503     /* Copy nalu */
504     memcpy( &p_nal->p_buffer[4], p, i_size );
505
506     return p_nal;
507 }
508
509 static void nal_get_decoded( uint8_t **pp_ret, int *pi_ret,
510                              uint8_t *src, int i_src )
511 {
512     uint8_t *end = &src[i_src];
513     uint8_t *dst = malloc( i_src );
514
515     *pp_ret = dst;
516
517     if( dst )
518     {
519         while( src < end )
520         {
521             if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
522                 src[2] == 0x03 )
523             {
524                 *dst++ = 0x00;
525                 *dst++ = 0x00;
526
527                 src += 3;
528                 continue;
529             }
530             *dst++ = *src++;
531         }
532     }
533     *pi_ret = dst - *pp_ret;
534 }
535
536 static inline int bs_read_ue( bs_t *s )
537 {
538     int i = 0;
539
540     while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
541     {
542         i++;
543     }
544     return( ( 1 << i) - 1 + bs_read( s, i ) );
545 }
546
547 static inline int bs_read_se( bs_t *s )
548 {
549     int val = bs_read_ue( s );
550
551     return val&0x01 ? (val+1)/2 : -(val/2);
552 }
553
554 /*****************************************************************************
555  * ParseNALBlock: parses annexB type NALs
556  * All p_frag blocks are required to start with 0 0 0 1 4-byte startcode
557  *****************************************************************************/
558 static block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
559 {
560     decoder_sys_t *p_sys = p_dec->p_sys;
561     block_t *p_pic = NULL;
562
563     const int i_nal_ref_idc = (p_frag->p_buffer[4] >> 5)&0x03;
564     const int i_nal_type = p_frag->p_buffer[4]&0x1f;
565
566 #define OUTPUT \
567     do {                                                      \
568         if( !p_sys->b_header && p_sys->slice.i_frame_type != BLOCK_FLAG_TYPE_I) \
569             break;                                            \
570                                                               \
571         if( p_sys->slice.i_frame_type == BLOCK_FLAG_TYPE_I && p_sys->p_sps && p_sys->p_pps ) \
572         { \
573             block_t *p_sps = block_Duplicate( p_sys->p_sps ); \
574             block_t *p_pps = block_Duplicate( p_sys->p_pps ); \
575             p_sps->i_dts = p_sys->p_frame->i_dts;           \
576             p_sps->i_pts = p_sys->p_frame->i_pts;           \
577             block_ChainAppend( &p_sps, p_pps );               \
578             block_ChainAppend( &p_sps, p_sys->p_frame );      \
579             p_sys->b_header = true;                       \
580             p_pic = block_ChainGather( p_sps );               \
581         } else { \
582             p_pic = block_ChainGather( p_sys->p_frame ); \
583         } \
584         p_pic->i_length = 0;    /* FIXME */                   \
585         p_pic->i_flags |= p_sys->slice.i_frame_type;          \
586             \
587         p_sys->slice.i_frame_type = 0;                        \
588         p_sys->p_frame = NULL;                                \
589         p_sys->b_slice = false;                           \
590     } while(0)
591
592     if( p_sys->b_slice && ( !p_sys->b_sps || !p_sys->b_pps ) )
593     {
594         block_ChainRelease( p_sys->p_frame );
595         msg_Warn( p_dec, "waiting for SPS/PPS" );
596
597         /* Reset context */
598         p_sys->slice.i_frame_type = 0;
599         p_sys->p_frame = NULL;
600         p_sys->b_slice = false;
601     }
602
603     if( ( !p_sys->b_sps || !p_sys->b_pps ) &&
604         i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
605     {
606         p_sys->b_slice = true;
607         /* Fragment will be discarded later on */
608     }
609     else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
610     {
611         uint8_t *dec = NULL;
612         int i_dec = 0, i_first_mb, i_slice_type;
613         slice_t slice;
614         bool b_pic;
615         bs_t s;
616
617         /* do not convert the whole frame */
618         nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
619                          __MIN( p_frag->i_buffer - 5, 60 ) );
620         bs_init( &s, dec, i_dec );
621
622         /* first_mb_in_slice */
623         i_first_mb = bs_read_ue( &s );
624
625         /* slice_type */
626         switch( (i_slice_type = bs_read_ue( &s )) )
627         {
628         case 0: case 5:
629             slice.i_frame_type = BLOCK_FLAG_TYPE_P;
630             break;
631         case 1: case 6:
632             slice.i_frame_type = BLOCK_FLAG_TYPE_B;
633             break;
634         case 2: case 7:
635             slice.i_frame_type = BLOCK_FLAG_TYPE_I;
636             break;
637         case 3: case 8: /* SP */
638             slice.i_frame_type = BLOCK_FLAG_TYPE_P;
639             break;
640         case 4: case 9:
641             slice.i_frame_type = BLOCK_FLAG_TYPE_I;
642             break;
643         default:
644             slice.i_frame_type = 0;
645             break;
646         }
647
648         /* */
649         slice.i_nal_type = i_nal_type;
650         slice.i_nal_ref_idc = i_nal_ref_idc;
651
652         slice.i_pic_parameter_set_id = bs_read_ue( &s );
653         slice.i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );
654
655         slice.i_field_pic_flag = 0;
656         slice.i_bottom_field_flag = -1;
657         if( !p_sys->b_frame_mbs_only )
658         {
659             /* field_pic_flag */
660             slice.i_field_pic_flag = bs_read( &s, 1 );
661             if( slice.i_field_pic_flag )
662                 slice.i_bottom_field_flag = bs_read( &s, 1 );
663         }
664
665         slice.i_idr_pic_id = p_sys->slice.i_idr_pic_id;
666         if( slice.i_nal_type == NAL_SLICE_IDR )
667             slice.i_idr_pic_id = bs_read_ue( &s );
668
669         slice.i_pic_order_cnt_lsb = -1;
670         slice.i_delta_pic_order_cnt_bottom = -1;
671         slice.i_delta_pic_order_cnt0 = 0;
672         slice.i_delta_pic_order_cnt1 = 0;
673         if( p_sys->i_pic_order_cnt_type == 0 )
674         {
675             slice.i_pic_order_cnt_lsb = bs_read( &s, p_sys->i_log2_max_pic_order_cnt_lsb + 4 );
676             if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
677                 slice.i_delta_pic_order_cnt_bottom = bs_read_se( &s );
678         }
679         else if( (p_sys->i_pic_order_cnt_type == 1) &&
680                  (!p_sys->i_delta_pic_order_always_zero_flag) )
681         {
682             slice.i_delta_pic_order_cnt0 = bs_read_se( &s );
683             if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
684                 slice.i_delta_pic_order_cnt1 = bs_read_se( &s );
685         }
686
687         /* Detection of the first VCL NAL unit of a primary coded picture
688          * (cf. 7.4.1.2.4) */
689         b_pic = false;
690         if( slice.i_frame_num != p_sys->slice.i_frame_num ||
691             slice.i_pic_parameter_set_id != p_sys->slice.i_pic_parameter_set_id ||
692             slice.i_field_pic_flag != p_sys->slice.i_field_pic_flag ||
693             slice.i_nal_ref_idc != p_sys->slice.i_nal_ref_idc )
694             b_pic = true;
695         if( (slice.i_bottom_field_flag != -1) &&
696             (p_sys->slice.i_bottom_field_flag != -1) &&
697             (slice.i_bottom_field_flag != p_sys->slice.i_bottom_field_flag) )
698             b_pic = true;
699         if( p_sys->i_pic_order_cnt_type == 0 &&
700             ( slice.i_pic_order_cnt_lsb != p_sys->slice.i_pic_order_cnt_lsb ||
701               slice.i_delta_pic_order_cnt_bottom != p_sys->slice.i_delta_pic_order_cnt_bottom ) )
702             b_pic = true;
703         else if( p_sys->i_pic_order_cnt_type == 1 &&
704                  ( slice.i_delta_pic_order_cnt0 != p_sys->slice.i_delta_pic_order_cnt0 ||
705                    slice.i_delta_pic_order_cnt1 != p_sys->slice.i_delta_pic_order_cnt1 ) )
706             b_pic = true;
707         if( ( slice.i_nal_type == NAL_SLICE_IDR || p_sys->slice.i_nal_type == NAL_SLICE_IDR ) &&
708             ( slice.i_nal_type != p_sys->slice.i_nal_type || slice.i_idr_pic_id != p_sys->slice.i_idr_pic_id ) )
709                 b_pic = true;
710
711         /* */
712         p_sys->slice = slice;
713
714         if( b_pic && p_sys->b_slice )
715             OUTPUT;
716
717         p_sys->b_slice = true;
718
719         free( dec );
720     }
721     else if( i_nal_type == NAL_SPS )
722     {
723         uint8_t *dec = NULL;
724         int     i_dec = 0;
725         bs_t s;
726         int i_tmp;
727
728         if( !p_sys->b_sps ) msg_Dbg( p_dec, "found NAL_SPS" );
729
730         p_sys->b_sps = true;
731
732         nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
733                          p_frag->i_buffer - 5 );
734
735         bs_init( &s, dec, i_dec );
736         /* Skip profile(8), constraint_set012, reserver(5), level(8) */
737         bs_skip( &s, 8 + 1+1+1 + 5 + 8 );
738         /* sps id */
739         bs_read_ue( &s );
740         /* Skip i_log2_max_frame_num */
741         p_sys->i_log2_max_frame_num = bs_read_ue( &s );
742         if( p_sys->i_log2_max_frame_num > 12)
743             p_sys->i_log2_max_frame_num = 12;
744         /* Read poc_type */
745         p_sys->i_pic_order_cnt_type = bs_read_ue( &s );
746         if( p_sys->i_pic_order_cnt_type == 0 )
747         {
748             /* skip i_log2_max_poc_lsb */
749             p_sys->i_log2_max_pic_order_cnt_lsb = bs_read_ue( &s );
750             if( p_sys->i_log2_max_pic_order_cnt_lsb > 12 )
751                 p_sys->i_log2_max_pic_order_cnt_lsb = 12;
752         }
753         else if( p_sys->i_pic_order_cnt_type == 1 )
754         {
755             int i_cycle;
756             /* skip b_delta_pic_order_always_zero */
757             p_sys->i_delta_pic_order_always_zero_flag = bs_read( &s, 1 );
758             /* skip i_offset_for_non_ref_pic */
759             bs_read_se( &s );
760             /* skip i_offset_for_top_to_bottom_field */
761             bs_read_se( &s );
762             /* read i_num_ref_frames_in_poc_cycle */
763             i_cycle = bs_read_ue( &s );
764             if( i_cycle > 256 ) i_cycle = 256;
765             while( i_cycle > 0 )
766             {
767                 /* skip i_offset_for_ref_frame */
768                 bs_read_se(&s );
769             }
770         }
771         /* i_num_ref_frames */
772         bs_read_ue( &s );
773         /* b_gaps_in_frame_num_value_allowed */
774         bs_skip( &s, 1 );
775
776         /* Read size */
777         p_dec->fmt_out.video.i_width  = 16 * ( bs_read_ue( &s ) + 1 );
778         p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );
779
780         /* b_frame_mbs_only */
781         p_sys->b_frame_mbs_only = bs_read( &s, 1 );
782         if( p_sys->b_frame_mbs_only == 0 )
783         {
784             bs_skip( &s, 1 );
785         }
786         /* b_direct8x8_inference */
787         bs_skip( &s, 1 );
788
789         /* crop */
790         i_tmp = bs_read( &s, 1 );
791         if( i_tmp )
792         {
793             /* left */
794             bs_read_ue( &s );
795             /* right */
796             bs_read_ue( &s );
797             /* top */
798             bs_read_ue( &s );
799             /* bottom */
800             bs_read_ue( &s );
801         }
802
803         /* vui */
804         i_tmp = bs_read( &s, 1 );
805         if( i_tmp )
806         {
807             /* read the aspect ratio part if any FIXME check it */
808             i_tmp = bs_read( &s, 1 );
809             if( i_tmp )
810             {
811                 static const struct { int w, h; } sar[14] =
812                 {
813                     { 0,   0 }, { 1,   1 }, { 12, 11 }, { 10, 11 },
814                     { 16, 11 }, { 40, 33 }, { 24, 11 }, { 20, 11 },
815                     { 32, 11 }, { 80, 33 }, { 18, 11 }, { 15, 11 },
816                     { 64, 33 }, { 160,99 },
817                 };
818                 int i_sar = bs_read( &s, 8 );
819                 int w, h;
820
821                 if( i_sar < 14 )
822                 {
823                     w = sar[i_sar].w;
824                     h = sar[i_sar].h;
825                 }
826                 else
827                 {
828                     w = bs_read( &s, 16 );
829                     h = bs_read( &s, 16 );
830                 }
831                 if( h != 0 )
832                     p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR * w /
833                         h * p_dec->fmt_out.video.i_width /
834                         p_dec->fmt_out.video.i_height;
835                 else
836                     p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR;
837             }
838         }
839
840         free( dec );
841
842         if( p_sys->b_slice ) OUTPUT;
843
844         /* We have a new SPS */
845         if( p_sys->p_sps ) block_Release( p_sys->p_sps );
846         p_sys->p_sps = p_frag;
847
848         /* Do not append the SPS because we will insert it on keyframes */
849         return p_pic;
850     }
851     else if( i_nal_type == NAL_PPS )
852     {
853         bs_t s;
854
855         bs_init( &s, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
856         bs_read_ue( &s ); // pps id
857         bs_read_ue( &s ); // sps id
858         bs_skip( &s, 1 ); // entropy coding mode flag
859         p_sys->i_pic_order_present_flag = bs_read( &s, 1 );
860
861         if( !p_sys->b_pps ) msg_Dbg( p_dec, "found NAL_PPS" );
862         p_sys->b_pps = true;
863
864         /* TODO */
865
866         if( p_sys->b_slice ) OUTPUT;
867
868         /* We have a new PPS */
869         if( p_sys->p_pps ) block_Release( p_sys->p_pps );
870         p_sys->p_pps = p_frag;
871
872         /* Do not append the PPS because we will insert it on keyframes */
873         return p_pic;
874     }
875     else if( i_nal_type == NAL_AU_DELIMITER ||
876              i_nal_type == NAL_SEI ||
877              ( i_nal_type >= 13 && i_nal_type <= 18 ) )
878     {
879         if( p_sys->b_slice ) OUTPUT;
880     }
881
882 #undef OUTPUT
883
884     /* Append the block */
885     block_ChainAppend( &p_sys->p_frame, p_frag );
886
887     return p_pic;
888 }