* another 1st string review, refs #438
[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  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
24  *****************************************************************************/
25
26 /*****************************************************************************
27  * Preamble
28  *****************************************************************************/
29 #include <stdlib.h>                                      /* malloc(), free() */
30
31 #include <vlc/vlc.h>
32 #include <vlc/decoder.h>
33 #include <vlc/sout.h>
34
35 #include "vlc_block_helper.h"
36 #include "vlc_bits.h"
37
38 /*****************************************************************************
39  * Module descriptor
40  *****************************************************************************/
41 static int  Open ( vlc_object_t * );
42 static void Close( vlc_object_t * );
43
44 vlc_module_begin();
45     set_category( CAT_SOUT );
46     set_subcategory( SUBCAT_SOUT_PACKETIZER );
47     set_description( _("H.264 video packetizer") );
48     set_capability( "packetizer", 50 );
49     set_callbacks( Open, Close );
50 vlc_module_end();
51
52
53 /****************************************************************************
54  * Local prototypes
55  ****************************************************************************/
56 static block_t *Packetize( decoder_t *, block_t ** );
57 static block_t *PacketizeAVC1( decoder_t *, block_t ** );
58
59 struct decoder_sys_t
60 {
61     block_bytestream_t bytestream;
62
63     int     i_state;
64     int     i_offset;
65     uint8_t startcode[4];
66
67     vlc_bool_t b_slice;
68     block_t    *p_frame;
69
70     vlc_bool_t   b_sps;
71     vlc_bool_t   b_pps;
72
73     /* avcC data */
74     int i_avcC_length_size;
75     block_t *p_sps;
76     block_t *p_pps;
77
78     /* Useful values of the Sequence Parameter Set */
79     int i_log2_max_frame_num;
80     int b_frame_mbs_only;
81
82     /* Useful values of the Slice Header */
83     int i_nal_type;
84     int i_nal_ref_idc;
85     int i_idr_pic_id;
86     int i_frame_num;
87 };
88
89 enum
90 {
91     STATE_NOSYNC,
92     STATE_NEXT_SYNC,
93 };
94
95 enum nal_unit_type_e
96 {
97     NAL_UNKNOWN = 0,
98     NAL_SLICE   = 1,
99     NAL_SLICE_DPA   = 2,
100     NAL_SLICE_DPB   = 3,
101     NAL_SLICE_DPC   = 4,
102     NAL_SLICE_IDR   = 5,    /* ref_idc != 0 */
103     NAL_SEI         = 6,    /* ref_idc == 0 */
104     NAL_SPS         = 7,
105     NAL_PPS         = 8,
106     NAL_AU_DELIMITER= 9
107     /* ref_idc == 0 for 6,9,10,11,12 */
108 };
109
110 enum nal_priority_e
111 {
112     NAL_PRIORITY_DISPOSABLE = 0,
113     NAL_PRIORITY_LOW        = 1,
114     NAL_PRIORITY_HIGH       = 2,
115     NAL_PRIORITY_HIGHEST    = 3,
116 };
117
118 static block_t *ParseNALBlock( decoder_t *, block_t * );
119
120 static block_t *nal_get_annexeb( decoder_t *, uint8_t *p, int );
121
122 /*****************************************************************************
123  * Open: probe the packetizer and return score
124  *****************************************************************************/
125 static int Open( vlc_object_t *p_this )
126 {
127     decoder_t     *p_dec = (decoder_t*)p_this;
128     decoder_sys_t *p_sys;
129
130     if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'h', '2', '6', '4') &&
131         p_dec->fmt_in.i_codec != VLC_FOURCC( 'H', '2', '6', '4') &&
132         p_dec->fmt_in.i_codec != VLC_FOURCC( 'V', 'S', 'S', 'H') &&
133         p_dec->fmt_in.i_codec != VLC_FOURCC( 'v', 's', 's', 'h') &&
134         ( p_dec->fmt_in.i_codec != VLC_FOURCC( 'a', 'v', 'c', '1') ||
135           p_dec->fmt_in.i_extra < 7 ) )
136     {
137         return VLC_EGENERIC;
138     }
139
140     /* Allocate the memory needed to store the decoder's structure */
141     if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
142     {
143         msg_Err( p_dec, "out of memory" );
144         return VLC_EGENERIC;
145     }
146     p_sys->i_state = STATE_NOSYNC;
147     p_sys->i_offset = 0;
148     p_sys->startcode[0] = 0;
149     p_sys->startcode[1] = 0;
150     p_sys->startcode[2] = 0;
151     p_sys->startcode[3] = 1;
152     p_sys->bytestream = block_BytestreamInit( p_dec );
153     p_sys->b_slice = VLC_FALSE;
154     p_sys->p_frame = NULL;
155     p_sys->b_sps   = VLC_FALSE;
156     p_sys->b_pps   = VLC_FALSE;
157     p_sys->p_sps   = 0;
158     p_sys->p_pps   = 0;
159
160     p_sys->i_nal_type = -1;
161     p_sys->i_nal_ref_idc = -1;
162     p_sys->i_idr_pic_id = -1;
163     p_sys->i_frame_num = -1;
164
165     /* Setup properties */
166     es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
167     p_dec->fmt_out.i_codec = VLC_FOURCC( 'h', '2', '6', '4' );
168     /* FIXME: FFMPEG isn't happy at all if you leave this */
169     if( p_dec->fmt_out.i_extra ) free( p_dec->fmt_out.p_extra );
170     p_dec->fmt_out.i_extra = 0; p_dec->fmt_out.p_extra = 0;
171
172     if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
173     {
174         uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
175         int i_sps, i_pps;
176         int i;
177
178         /* Parse avcC */
179         p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
180
181         /* Read SPS */
182         i_sps = (*p++)&0x1f;
183
184         for( i = 0; i < i_sps; i++ )
185         {
186             int i_length = GetWBE( p );
187             block_t *p_sps = nal_get_annexeb( p_dec, p + 2, i_length );
188
189             p_sys->p_sps = block_Duplicate( p_sps );
190             p_sps->i_pts = p_sps->i_dts = mdate();
191             ParseNALBlock( p_dec, p_sps );
192             p += 2 + i_length;
193         }
194         /* Read PPS */
195         i_pps = *p++;
196         for( i = 0; i < i_pps; i++ )
197         {
198             int i_length = GetWBE( p );
199             block_t *p_pps = nal_get_annexeb( p_dec, p + 2, i_length );
200
201             p_sys->p_pps = block_Duplicate( p_pps );
202             p_pps->i_pts = p_pps->i_dts = mdate();
203             ParseNALBlock( p_dec, p_pps );
204             p += 2 + i_length;
205         }
206         msg_Dbg( p_dec, "avcC length size=%d, sps=%d, pps=%d",
207                  p_sys->i_avcC_length_size, i_sps, i_pps );
208
209         /* Set callback */
210         p_dec->pf_packetize = PacketizeAVC1;
211     }
212     else
213     {
214         /* Set callback */
215         p_dec->pf_packetize = Packetize;
216
217         /* */
218         if( p_dec->fmt_in.i_extra > 0 )
219         {
220             block_t *p_init = block_New( p_dec, p_dec->fmt_in.i_extra );
221             block_t *p_pic;
222
223             memcpy( p_init->p_buffer, p_dec->fmt_in.p_extra,
224                     p_dec->fmt_in.i_extra );
225
226             while( ( p_pic = Packetize( p_dec, &p_init ) ) )
227             {
228                 /* Should not occur because we should only receive SPS/PPS */
229                 block_Release( p_pic );
230             }
231         }
232     }
233
234     return VLC_SUCCESS;
235 }
236
237 /*****************************************************************************
238  * Close: clean up the packetizer
239  *****************************************************************************/
240 static void Close( vlc_object_t *p_this )
241 {
242     decoder_t *p_dec = (decoder_t*)p_this;
243     decoder_sys_t *p_sys = p_dec->p_sys;
244
245     if( p_sys->p_frame ) block_ChainRelease( p_sys->p_frame );
246     if( p_sys->p_sps ) block_Release( p_sys->p_sps );
247     if( p_sys->p_pps ) block_Release( p_sys->p_pps );
248     block_BytestreamRelease( &p_sys->bytestream );
249     free( p_sys );
250 }
251
252 /****************************************************************************
253  * Packetize: the whole thing
254  ****************************************************************************/
255 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
256 {
257     decoder_sys_t *p_sys = p_dec->p_sys;
258     block_t       *p_pic;
259
260     if( !pp_block || !*pp_block ) return NULL;
261
262     block_BytestreamPush( &p_sys->bytestream, *pp_block );
263
264     for( ;; )
265     {
266         switch( p_sys->i_state )
267         {
268             case STATE_NOSYNC:
269                 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
270                       &p_sys->i_offset, p_sys->startcode+1, 3 ) == VLC_SUCCESS)
271                 {
272                     p_sys->i_state = STATE_NEXT_SYNC;
273                 }
274
275                 if( p_sys->i_offset )
276                 {
277                     block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
278                     p_sys->i_offset = 0;
279                     block_BytestreamFlush( &p_sys->bytestream );
280                 }
281
282                 if( p_sys->i_state != STATE_NEXT_SYNC )
283                 {
284                     /* Need more data */
285                     return NULL;
286                 }
287
288                 p_sys->i_offset = 1; /* To find next startcode */
289
290             case STATE_NEXT_SYNC:
291                 /* Find the next startcode */
292                 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
293                       &p_sys->i_offset, p_sys->startcode+1, 3 ) != VLC_SUCCESS)
294                 {
295                     /* Need more data */
296                     return NULL;
297                 }
298
299                 /* Get the new fragment and set the pts/dts */
300                 p_pic = block_New( p_dec, p_sys->i_offset );
301                 p_pic->i_pts = p_sys->bytestream.p_block->i_pts;
302                 p_pic->i_dts = p_sys->bytestream.p_block->i_dts;
303
304                 block_GetBytes( &p_sys->bytestream, p_pic->p_buffer,
305                                 p_pic->i_buffer );
306
307                 if( !p_pic->p_buffer[p_pic->i_buffer-1] ) p_pic->i_buffer--;
308                 p_sys->i_offset = 0;
309
310                 /* Parse the NAL */
311                 if( !( p_pic = ParseNALBlock( p_dec, p_pic ) ) )
312                 {
313                     p_sys->i_state = STATE_NOSYNC;
314                     break;
315                 }
316 #if 0
317                 msg_Dbg( p_dec, "pts="I64Fd" dts="I64Fd,
318                          p_pic->i_pts, p_pic->i_dts );
319 #endif
320
321                 /* So p_block doesn't get re-added several times */
322                 *pp_block = block_BytestreamPop( &p_sys->bytestream );
323
324                 p_sys->i_state = STATE_NOSYNC;
325
326                 return p_pic;
327         }
328     }
329 }
330
331 /****************************************************************************
332  * PacketizeAVC1: the whole thing
333  ****************************************************************************/
334 static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
335 {
336     decoder_sys_t *p_sys = p_dec->p_sys;
337     block_t       *p_block;
338     block_t       *p_ret = NULL;
339     uint8_t       *p;
340
341     if( !pp_block || !*pp_block ) return NULL;
342
343     p_block = *pp_block;
344     *pp_block = NULL;
345
346 #if 0
347     if( //(p_block->i_flags & BLOCK_FLAG_TYPE_I) &&
348         p_sys->p_sps && p_sys->p_pps )
349     {
350         block_t *p_pic;
351         block_t *p_sps = block_Duplicate( p_sys->p_sps );
352         block_t *p_pps = block_Duplicate( p_sys->p_pps );
353         p_sps->i_dts = p_pps->i_dts = p_block->i_dts;
354         p_sps->i_pts = p_pps->i_pts = p_block->i_pts;
355         p_pic = ParseNALBlock( p_dec, p_sps );
356         if( p_pic ) block_ChainAppend( &p_ret, p_pic );
357         p_pic = ParseNALBlock( p_dec, p_pps );
358         if( p_pic ) block_ChainAppend( &p_ret, p_pic );
359     }
360 #endif
361
362     for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
363     {
364         block_t *p_pic;
365         int i_size = 0;
366         int i;
367
368         for( i = 0; i < p_sys->i_avcC_length_size; i++ )
369         {
370             i_size = (i_size << 8) | (*p++);
371         }
372
373         if( i_size > 0 )
374         {
375             block_t *p_part = nal_get_annexeb( p_dec, p, i_size );
376
377             p_part->i_dts = p_block->i_dts;
378             p_part->i_pts = p_block->i_pts;
379
380             /* Parse the NAL */
381             if( ( p_pic = ParseNALBlock( p_dec, p_part ) ) )
382             {
383                 block_ChainAppend( &p_ret, p_pic );
384             }
385         }
386         p += i_size;
387     }
388     block_Release( p_block );
389
390     return p_ret;
391 }
392
393 static block_t *nal_get_annexeb( decoder_t *p_dec, uint8_t *p, int i_size )
394 {
395     block_t *p_nal;
396
397     p_nal = block_New( p_dec, 3 + i_size );
398
399     /* Add start code */
400     p_nal->p_buffer[0] = 0x00;
401     p_nal->p_buffer[1] = 0x00;
402     p_nal->p_buffer[2] = 0x01;
403
404     /* Copy nalu */
405     memcpy( &p_nal->p_buffer[3], p, i_size );
406
407     return p_nal;
408 }
409
410 static void nal_get_decoded( uint8_t **pp_ret, int *pi_ret,
411                              uint8_t *src, int i_src )
412 {
413     uint8_t *end = &src[i_src];
414     uint8_t *dst = malloc( i_src );
415
416     *pp_ret = dst;
417
418     while( src < end )
419     {
420         if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
421             src[2] == 0x03 )
422         {
423             *dst++ = 0x00;
424             *dst++ = 0x00;
425
426             src += 3;
427             continue;
428         }
429         *dst++ = *src++;
430     }
431
432     *pi_ret = dst - *pp_ret;
433 }
434
435 static inline int bs_read_ue( bs_t *s )
436 {
437     int i = 0;
438
439     while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
440     {
441         i++;
442     }
443     return( ( 1 << i) - 1 + bs_read( s, i ) );
444 }
445
446 static inline int bs_read_se( bs_t *s )
447 {
448     int val = bs_read_ue( s );
449
450     return val&0x01 ? (val+1)/2 : -(val/2);
451 }
452
453
454 static block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
455 {
456     decoder_sys_t *p_sys = p_dec->p_sys;
457     block_t *p_pic = NULL;
458
459     const int i_nal_ref_idc = (p_frag->p_buffer[3] >> 5)&0x03;
460     const int i_nal_type = p_frag->p_buffer[3]&0x1f;
461
462 #define OUTPUT \
463     do {                                                \
464         p_pic = block_ChainGather( p_sys->p_frame );    \
465         p_pic->i_length = 0;    /* FIXME */             \
466                                                         \
467         p_sys->p_frame = NULL;                          \
468         p_sys->b_slice = VLC_FALSE;                     \
469     } while(0)
470
471
472     if( p_sys->b_slice && !p_sys->b_sps )
473     {
474         block_ChainRelease( p_sys->p_frame );
475         msg_Warn( p_dec, "waiting for SPS" );
476
477         /* Reset context */
478         p_sys->p_frame = NULL;
479         p_sys->b_slice = VLC_FALSE;
480     }
481
482     if( !p_sys->b_sps &&
483         i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
484     {
485         p_sys->b_slice = VLC_TRUE;
486         /* Fragment will be discarded later on */
487     }
488     else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
489     {
490         uint8_t *dec;
491         int i_dec, i_first_mb, i_slice_type, i_frame_num, i_pic_flags = 0;
492         vlc_bool_t b_pic = VLC_FALSE;
493         bs_t s;
494
495         /* do not convert the whole frame */
496         nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[4],
497                          __MIN( p_frag->i_buffer - 4, 60 ) );
498         bs_init( &s, dec, i_dec );
499
500         /* first_mb_in_slice */
501         i_first_mb = bs_read_ue( &s );
502
503         /* slice_type */
504         switch( (i_slice_type = bs_read_ue( &s )) )
505         {
506             case 0: case 5:
507                 i_pic_flags = BLOCK_FLAG_TYPE_P;
508                 break;
509             case 1: case 6:
510                 i_pic_flags = BLOCK_FLAG_TYPE_B;
511                 break;
512             case 2: case 7:
513                 i_pic_flags = BLOCK_FLAG_TYPE_I;
514                 break;
515             case 3: case 8: /* SP */
516                 i_pic_flags = BLOCK_FLAG_TYPE_P;
517                 break;
518             case 4: case 9:
519                 i_pic_flags = BLOCK_FLAG_TYPE_I;
520                 break;
521         }
522
523         /* pic_parameter_set_id */
524         bs_read_ue( &s );
525         /* frame_num */
526         i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );
527
528         /* Detection of the first VCL NAL unit of a primary coded picture
529          * (cf. 7.4.1.2.4) */
530         if( i_frame_num != p_sys->i_frame_num ||
531             ( (i_nal_ref_idc != p_sys->i_nal_ref_idc) &&
532               (!i_nal_ref_idc || !p_sys->i_nal_ref_idc) ) )
533         {
534             b_pic = VLC_TRUE;
535         }
536         p_sys->i_frame_num = i_frame_num;
537         p_sys->i_nal_ref_idc = i_nal_ref_idc;
538
539         if( !p_sys->b_frame_mbs_only )
540         {
541             /* field_pic_flag */
542             if( bs_read( &s, 1 ) )
543             {
544                 /* bottom_field_flag */
545                 bs_read( &s, 1 );
546             }
547         }
548
549         if( i_nal_type == NAL_SLICE_IDR )
550         {
551             /* id_pic_id */
552             int i_idr_pic_id = bs_read_ue( &s );
553             if( p_sys->i_nal_type != i_nal_type ) b_pic = VLC_TRUE;
554             if( p_sys->i_idr_pic_id != i_idr_pic_id ) b_pic = VLC_TRUE;
555             p_sys->i_idr_pic_id = i_idr_pic_id;
556         }
557         p_sys->i_nal_type = i_nal_type;
558
559         if( b_pic && p_sys->b_slice ) OUTPUT;
560
561         p_sys->b_slice = VLC_TRUE;
562
563         free( dec );
564     }
565     else if( i_nal_type == NAL_SPS )
566     {
567         uint8_t *dec;
568         int     i_dec;
569         bs_t s;
570         int i_tmp;
571
572         if( !p_sys->b_sps ) msg_Dbg( p_dec, "found NAL_SPS" );
573
574         p_sys->b_sps = VLC_TRUE;
575
576         nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[4],
577                          p_frag->i_buffer - 4 );
578
579         bs_init( &s, dec, i_dec );
580         /* Skip profile(8), constraint_set012, reserver(5), level(8) */
581         bs_skip( &s, 8 + 1+1+1 + 5 + 8 );
582         /* sps id */
583         bs_read_ue( &s );
584         /* Skip i_log2_max_frame_num */
585         p_sys->i_log2_max_frame_num = bs_read_ue( &s );
586         /* Read poc_type */
587         i_tmp = bs_read_ue( &s );
588         if( i_tmp == 0 )
589         {
590             /* skip i_log2_max_poc_lsb */
591             bs_read_ue( &s );
592         }
593         else if( i_tmp == 1 )
594         {
595             int i_cycle;
596             /* skip b_delta_pic_order_always_zero */
597             bs_skip( &s, 1 );
598             /* skip i_offset_for_non_ref_pic */
599             bs_read_se( &s );
600             /* skip i_offset_for_top_to_bottom_field */
601             bs_read_se( &s );
602             /* read i_num_ref_frames_in_poc_cycle */
603             i_cycle = bs_read_ue( &s );
604             if( i_cycle > 256 ) i_cycle = 256;
605             while( i_cycle > 0 )
606             {
607                 /* skip i_offset_for_ref_frame */
608                 bs_read_se(&s );
609             }
610         }
611         /* i_num_ref_frames */
612         bs_read_ue( &s );
613         /* b_gaps_in_frame_num_value_allowed */
614         bs_skip( &s, 1 );
615
616         /* Read size */
617         p_dec->fmt_out.video.i_width  = 16 * ( bs_read_ue( &s ) + 1 );
618         p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );
619
620         /* b_frame_mbs_only */
621         p_sys->b_frame_mbs_only = bs_read( &s, 1 );
622         if( p_sys->b_frame_mbs_only == 0 )
623         {
624             bs_skip( &s, 1 );
625         }
626         /* b_direct8x8_inference */
627         bs_skip( &s, 1 );
628
629         /* crop */
630         i_tmp = bs_read( &s, 1 );
631         if( i_tmp )
632         {
633             /* left */
634             bs_read_ue( &s );
635             /* right */
636             bs_read_ue( &s );
637             /* top */
638             bs_read_ue( &s );
639             /* bottom */
640             bs_read_ue( &s );
641         }
642
643         /* vui */
644         i_tmp = bs_read( &s, 1 );
645         if( i_tmp )
646         {
647             /* read the aspect ratio part if any FIXME check it */
648             i_tmp = bs_read( &s, 1 );
649             if( i_tmp )
650             {
651                 static const struct { int w, h; } sar[14] =
652                 {
653                     { 0,   0 }, { 1,   1 }, { 12, 11 }, { 10, 11 },
654                     { 16, 11 }, { 40, 33 }, { 24, 11 }, { 20, 11 },
655                     { 32, 11 }, { 80, 33 }, { 18, 11 }, { 15, 11 },
656                     { 64, 33 }, { 160,99 },
657                 };
658                 int i_sar = bs_read( &s, 8 );
659                 int w, h;
660
661                 if( i_sar < 14 )
662                 {
663                     w = sar[i_sar].w;
664                     h = sar[i_sar].h;
665                 }
666                 else
667                 {
668                     w = bs_read( &s, 16 );
669                     h = bs_read( &s, 16 );
670                 }
671                 if( h != 0 )
672                     p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR * w /
673                         h * p_dec->fmt_out.video.i_width /
674                         p_dec->fmt_out.video.i_height;
675                 else
676                     p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR;
677             }
678         }
679
680         free( dec );
681
682
683         if( p_sys->b_slice ) OUTPUT;
684     }
685     else if( i_nal_type == NAL_PPS )
686     {
687         bs_t s;
688         bs_init( &s, &p_frag->p_buffer[4], p_frag->i_buffer - 4 );
689
690         if( !p_sys->b_pps ) msg_Dbg( p_dec, "found NAL_PPS" );
691         p_sys->b_pps = VLC_TRUE;
692
693         /* TODO */
694
695         if( p_sys->b_slice ) OUTPUT;
696     }
697     else if( i_nal_type == NAL_AU_DELIMITER ||
698              i_nal_type == NAL_SEI ||
699              ( i_nal_type >= 13 && i_nal_type <= 18 ) )
700     {
701         if( p_sys->b_slice ) OUTPUT;
702     }
703
704 #undef OUTPUT
705
706     /* Append the block */
707     block_ChainAppend( &p_sys->p_frame, p_frag );
708
709     return p_pic;
710 }