* block: added
[vlc.git] / modules / codec / libmpeg2.c
1 /*****************************************************************************
2  * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
3  *****************************************************************************
4  * Copyright (C) 1999-2001 VideoLAN
5  * $Id$
6  *
7  * Authors: Gildas Bazin <gbazin@videolan.org>
8  *          Christophe Massiot <massiot@via.ecp.fr>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
23  *****************************************************************************/
24
25 /*****************************************************************************
26  * Preamble
27  *****************************************************************************/
28 #include <vlc/vlc.h>
29 #include <vlc/vout.h>
30 #include <vlc/decoder.h>
31
32 #include <mpeg2dec/mpeg2.h>
33
34 #include "vout_synchro.h"
35
36 /* Aspect ratio (ISO/IEC 13818-2 section 6.3.3, table 6-3) */
37 #define AR_SQUARE_PICTURE       1                           /* square pixels */
38 #define AR_3_4_PICTURE          2                        /* 3:4 picture (TV) */
39 #define AR_16_9_PICTURE         3              /* 16:9 picture (wide screen) */
40 #define AR_221_1_PICTURE        4                  /* 2.21:1 picture (movie) */
41
42 /*****************************************************************************
43  * decoder_sys_t : libmpeg2 decoder descriptor
44  *****************************************************************************/
45 struct decoder_sys_t
46 {
47     /*
48      * libmpeg2 properties
49      */
50     mpeg2dec_t          *p_mpeg2dec;
51     const mpeg2_info_t  *p_info;
52     vlc_bool_t          b_skip;
53
54     /*
55      * Input properties
56      */
57     mtime_t          i_previous_pts;
58     mtime_t          i_current_pts;
59     mtime_t          i_previous_dts;
60     mtime_t          i_current_dts;
61     int              i_current_rate;
62     picture_t *      p_picture_to_destroy;
63     vlc_bool_t       b_garbage_pic;
64     vlc_bool_t       b_after_sequence_header; /* is it the next frame after
65                                                * the sequence header ?    */
66     vlc_bool_t       b_slice_i;             /* intra-slice refresh stream */
67
68     vlc_bool_t      b_preroll;
69
70     /*
71      * Output properties
72      */
73     vout_synchro_t *p_synchro;
74     int            i_aspect;
75     mtime_t        i_last_frame_pts;
76
77 };
78
79 /*****************************************************************************
80  * Local prototypes
81  *****************************************************************************/
82 static int  OpenDecoder( vlc_object_t * );
83 static void CloseDecoder( vlc_object_t * );
84
85 static picture_t *DecodeBlock( decoder_t *, block_t ** );
86
87 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
88
89 /*****************************************************************************
90  * Module descriptor
91  *****************************************************************************/
92 vlc_module_begin();
93     set_description( _("MPEG I/II video decoder (using libmpeg2)") );
94     set_capability( "decoder", 150 );
95     set_category( CAT_INPUT );
96     set_subcategory( SUBCAT_INPUT_VCODEC );
97     set_callbacks( OpenDecoder, CloseDecoder );
98     add_shortcut( "libmpeg2" );
99 vlc_module_end();
100
101 /*****************************************************************************
102  * OpenDecoder: probe the decoder and return score
103  *****************************************************************************/
104 static int OpenDecoder( vlc_object_t *p_this )
105 {
106     decoder_t *p_dec = (decoder_t*)p_this;
107     decoder_sys_t *p_sys;
108     uint32_t i_accel = 0;
109
110     if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','v') &&
111         p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
112         /* Pinnacle hardware-mpeg1 */
113         p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
114         /* ATI Video */
115         p_dec->fmt_in.i_codec != VLC_FOURCC('V','C','R','2') &&
116         p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') )
117     {
118         return VLC_EGENERIC;
119     }
120
121     /* Allocate the memory needed to store the decoder's structure */
122     if( ( p_dec->p_sys = p_sys =
123           (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
124     {
125         msg_Err( p_dec, "out of memory" );
126         return VLC_EGENERIC;
127     }
128
129     /* Initialize the thread properties */
130     memset( p_sys, 0, sizeof(decoder_sys_t) );
131     p_sys->p_mpeg2dec = NULL;
132     p_sys->p_synchro  = NULL;
133     p_sys->p_info     = NULL;
134     p_sys->i_current_pts  = 0;
135     p_sys->i_previous_pts = 0;
136     p_sys->i_current_dts  = 0;
137     p_sys->i_previous_dts = 0;
138     p_sys->p_picture_to_destroy = NULL;
139     p_sys->b_garbage_pic = 0;
140     p_sys->b_slice_i  = 0;
141     p_sys->b_skip     = 0;
142     p_sys->b_preroll = VLC_FALSE;
143
144 #if defined( __i386__ )
145     if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMX )
146     {
147         i_accel |= MPEG2_ACCEL_X86_MMX;
148     }
149
150     if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_3DNOW )
151     {
152         i_accel |= MPEG2_ACCEL_X86_3DNOW;
153     }
154
155     if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMXEXT )
156     {
157         i_accel |= MPEG2_ACCEL_X86_MMXEXT;
158     }
159
160 #elif defined( __powerpc__ ) || defined( SYS_DARWIN )
161     if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_ALTIVEC )
162     {
163         i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
164     }
165
166 #else
167     /* If we do not know this CPU, trust libmpeg2's feature detection */
168     i_accel = MPEG2_ACCEL_DETECT;
169
170 #endif
171
172     /* Set CPU acceleration features */
173     mpeg2_accel( i_accel );
174
175     /* Initialize decoder */
176     p_sys->p_mpeg2dec = mpeg2_init();
177     if( p_sys->p_mpeg2dec == NULL)
178     {
179         msg_Err( p_dec, "mpeg2_init() failed" );
180         free( p_sys );
181         return VLC_EGENERIC;
182     }
183
184     p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
185
186     p_dec->pf_decode_video = DecodeBlock;
187
188     return VLC_SUCCESS;
189 }
190
191 /*****************************************************************************
192  * RunDecoder: the libmpeg2 decoder
193  *****************************************************************************/
194 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
195 {
196     decoder_sys_t   *p_sys = p_dec->p_sys;
197     mpeg2_state_t   state;
198     picture_t       *p_pic;
199
200     block_t *p_block;
201
202     if( !pp_block || !*pp_block ) return NULL;
203
204     p_block = *pp_block;
205
206     while( 1 )
207     {
208         state = mpeg2_parse( p_sys->p_mpeg2dec );
209
210         switch( state )
211         {
212         case STATE_BUFFER:
213             if( !p_block->i_buffer )
214             {
215                 block_Release( p_block );
216                 return NULL;
217             }
218
219             if( (p_block->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED)) &&
220                 p_sys->p_synchro &&
221                 p_sys->p_info->sequence &&
222                 p_sys->p_info->sequence->width != (unsigned)-1 )
223             {
224                 vout_SynchroReset( p_sys->p_synchro );
225                 if( p_sys->p_info->current_fbuf != NULL
226                     && p_sys->p_info->current_fbuf->id != NULL )
227                 {
228                     p_sys->b_garbage_pic = 1;
229                     p_pic = p_sys->p_info->current_fbuf->id;
230                 }
231                 else
232                 {
233                     uint8_t *buf[3];
234                     buf[0] = buf[1] = buf[2] = NULL;
235                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
236                         break;
237                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
238                 }
239                 p_sys->p_picture_to_destroy = p_pic;
240
241                 if ( p_sys->b_slice_i )
242                 {
243                     vout_SynchroNewPicture( p_sys->p_synchro,
244                         I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
245                     vout_SynchroDecode( p_sys->p_synchro );
246                     vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
247                 }
248             }
249
250             if( p_block->i_flags & BLOCK_FLAG_PREROLL )
251             {
252                 p_sys->b_preroll = VLC_TRUE;
253             }
254             else if( p_sys->b_preroll )
255             {
256                 p_sys->b_preroll = VLC_FALSE;
257                 /* Reset synchro */
258                 vout_SynchroReset( p_sys->p_synchro );
259             }
260
261 #ifdef PIC_FLAG_PTS
262             if( p_block->i_pts )
263             {
264                 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
265
266 #else /* New interface */
267             if( p_block->i_pts || p_block->i_dts )
268             {
269                 mpeg2_tag_picture( p_sys->p_mpeg2dec,
270                                    (uint32_t)p_block->i_pts,
271                                    (uint32_t)p_block->i_dts );
272 #endif
273                 p_sys->i_previous_pts = p_sys->i_current_pts;
274                 p_sys->i_current_pts = p_block->i_pts;
275                 p_sys->i_previous_dts = p_sys->i_current_dts;
276                 p_sys->i_current_dts = p_block->i_dts;
277             }
278
279             p_sys->i_current_rate = p_block->i_rate;
280
281             mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
282                           p_block->p_buffer + p_block->i_buffer );
283
284             p_block->i_buffer = 0;
285             break;
286
287         case STATE_SEQUENCE:
288         {
289             /* Initialize video output */
290             uint8_t *buf[3];
291             buf[0] = buf[1] = buf[2] = NULL;
292
293             /* Check whether the input gave a particular aspect ratio */
294             if( p_dec->fmt_in.video.i_aspect )
295             {
296                 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
297                 if( p_sys->i_aspect <= AR_221_1_PICTURE )
298                 switch( p_sys->i_aspect )
299                 {
300                 case AR_3_4_PICTURE:
301                     p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
302                     break;
303                 case AR_16_9_PICTURE:
304                     p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
305                     break;
306                 case AR_221_1_PICTURE:
307                     p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
308                     break;
309                 case AR_SQUARE_PICTURE:
310                     p_sys->i_aspect = VOUT_ASPECT_FACTOR *
311                                    p_sys->p_info->sequence->width /
312                                    p_sys->p_info->sequence->height;
313                     break;
314                 }
315             }
316             else
317             {
318                 /* Use the value provided in the MPEG sequence header */
319                 if( p_sys->p_info->sequence->pixel_height > 0 )
320                 {
321                     p_sys->i_aspect =
322                         ((uint64_t)p_sys->p_info->sequence->display_width) *
323                         p_sys->p_info->sequence->pixel_width *
324                         VOUT_ASPECT_FACTOR /
325                         p_sys->p_info->sequence->display_height /
326                         p_sys->p_info->sequence->pixel_height;
327                 }
328                 else
329                 {
330                     /* Invalid aspect, assume 4:3.
331                      * This shouldn't happen and if it does it is a bug
332                      * in libmpeg2 (likely triggered by an invalid stream) */
333                     p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
334                 }
335             }
336
337             msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
338                      p_sys->p_info->sequence->width,
339                      p_sys->p_info->sequence->height, p_sys->i_aspect,
340                      (uint32_t)((uint64_t)1001000000 * 27 /
341                          p_sys->p_info->sequence->frame_period / 1001),
342                      (uint32_t)((uint64_t)1001000000 * 27 /
343                          p_sys->p_info->sequence->frame_period % 1001) );
344
345             mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
346
347             /* Set the first 2 reference frames */
348             mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
349
350             if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
351             {
352                 block_Release( p_block );
353                 return NULL;
354             }
355
356             mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
357
358             /* This picture will never go through display_picture. */
359             p_pic->date = 0;
360
361             /* For some reason, libmpeg2 will put this pic twice in
362              * discard_picture. This can be considered a bug in libmpeg2. */
363             p_dec->pf_picture_link( p_dec, p_pic );
364
365             if( p_sys->p_synchro )
366             {
367                 vout_SynchroRelease( p_sys->p_synchro );
368             }
369             p_sys->p_synchro = vout_SynchroInit( p_dec,
370                 (uint32_t)((uint64_t)1001000000 * 27 /
371                 p_sys->p_info->sequence->frame_period) );
372             p_sys->b_after_sequence_header = 1;
373         }
374         break;
375
376         case STATE_PICTURE_2ND:
377             vout_SynchroNewPicture( p_sys->p_synchro,
378                 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
379                 p_sys->p_info->current_picture->nb_fields,
380                 0, 0, p_sys->i_current_rate );
381
382             if( p_sys->b_skip )
383             {
384                 vout_SynchroTrash( p_sys->p_synchro );
385             }
386             else
387             {
388                 vout_SynchroDecode( p_sys->p_synchro );
389             }
390             break;
391
392         case STATE_PICTURE:
393         {
394             uint8_t *buf[3];
395             mtime_t i_pts, i_dts;
396             buf[0] = buf[1] = buf[2] = NULL;
397
398             if ( p_sys->b_after_sequence_header &&
399                  ((p_sys->p_info->current_picture->flags &
400                        PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
401             {
402                 /* Intra-slice refresh. Simulate a blank I picture. */
403                 msg_Dbg( p_dec, "intra-slice refresh stream" );
404                 vout_SynchroNewPicture( p_sys->p_synchro,
405                     I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
406                 vout_SynchroDecode( p_sys->p_synchro );
407                 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
408                 p_sys->b_slice_i = 1;
409             }
410             p_sys->b_after_sequence_header = 0;
411
412 #ifdef PIC_FLAG_PTS
413             i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
414                 ( ( p_sys->p_info->current_picture->pts ==
415                     (uint32_t)p_sys->i_current_pts ) ?
416                   p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
417             i_dts = 0;
418
419             /* Hack to handle demuxers which only have DTS timestamps */
420             if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
421             {
422                 if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
423                     (p_sys->p_info->current_picture->flags &
424                       PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
425                 {
426                     i_pts = p_block->i_dts;
427                 }
428             }
429             p_block->i_pts = p_block->i_dts = 0;
430             /* End hack */
431
432 #else /* New interface */
433
434             i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
435                 ( ( p_sys->p_info->current_picture->tag ==
436                     (uint32_t)p_sys->i_current_pts ) ?
437                   p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
438             i_dts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
439                 ( ( p_sys->p_info->current_picture->tag2 ==
440                     (uint32_t)p_sys->i_current_dts ) ?
441                   p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
442 #endif
443
444             vout_SynchroNewPicture( p_sys->p_synchro,
445                 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
446                 p_sys->p_info->current_picture->nb_fields, i_pts, i_dts,
447                 p_sys->i_current_rate );
448
449             if( !p_dec->b_pace_control && !p_sys->b_preroll &&
450                 !(p_sys->b_slice_i
451                    && ((p_sys->p_info->current_picture->flags
452                          & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
453                    && !vout_SynchroChoose( p_sys->p_synchro,
454                               p_sys->p_info->current_picture->flags
455                                 & PIC_MASK_CODING_TYPE,
456                               /*p_sys->p_vout->render_time*/ 0 /*FIXME*/ ) )
457             {
458                 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
459                 p_sys->b_skip = 1;
460                 vout_SynchroTrash( p_sys->p_synchro );
461                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
462             }
463             else
464             {
465                 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
466                 p_sys->b_skip = 0;
467                 vout_SynchroDecode( p_sys->p_synchro );
468
469                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
470                 {
471                     block_Release( p_block );
472                     return NULL;
473                 }
474
475                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
476             }
477         }
478         break;
479
480         case STATE_END:
481         case STATE_SLICE:
482             p_pic = NULL;
483             if( p_sys->p_info->display_fbuf
484                 && p_sys->p_info->display_fbuf->id )
485             {
486                 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
487
488                 vout_SynchroEnd( p_sys->p_synchro,
489                             p_sys->p_info->display_picture->flags
490                              & PIC_MASK_CODING_TYPE,
491                             p_sys->b_garbage_pic );
492                 p_sys->b_garbage_pic = 0;
493
494                 if ( p_sys->p_picture_to_destroy != p_pic )
495                 {
496                     p_pic->date = vout_SynchroDate( p_sys->p_synchro );
497                 }
498                 else
499                 {
500                     p_sys->p_picture_to_destroy = NULL;
501                     p_pic->date = 0;
502                 }
503             }
504
505             if( p_sys->p_info->discard_fbuf &&
506                 p_sys->p_info->discard_fbuf->id )
507             {
508                 p_dec->pf_picture_unlink( p_dec,
509                                           p_sys->p_info->discard_fbuf->id );
510             }
511
512             /* For still frames */
513             if( state == STATE_END && p_pic ) p_pic->b_force = VLC_TRUE;
514
515             if( p_pic )
516             {
517                 /* Avoid frames with identical timestamps.
518                  * Especially needed for still frames in DVD menus. */
519                 if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
520                 p_sys->i_last_frame_pts = p_pic->date;
521
522                 return p_pic;
523             }
524
525             break;
526
527         case STATE_INVALID:
528         {
529             uint8_t *buf[3];
530             buf[0] = buf[1] = buf[2] = NULL;
531
532             msg_Warn( p_dec, "invalid picture encountered" );
533             if ( ( p_sys->p_info->current_picture == NULL ) ||
534                ( ( p_sys->p_info->current_picture->flags &
535                    PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
536             {
537                 if( p_sys->p_synchro ) vout_SynchroReset( p_sys->p_synchro );
538             }
539             mpeg2_skip( p_sys->p_mpeg2dec, 1 );
540             p_sys->b_skip = 1;
541
542             if( p_sys->p_info->current_fbuf &&
543                 p_sys->p_info->current_fbuf->id )
544             {
545                 p_sys->b_garbage_pic = 1;
546                 p_pic = p_sys->p_info->current_fbuf->id;
547             }
548             else if( !p_sys->p_info->sequence )
549             {
550                 break;
551             }
552             else
553             {
554                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
555                     break;
556                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
557             }
558             p_sys->p_picture_to_destroy = p_pic;
559
560             memset( p_pic->p[0].p_pixels, 0,
561                     p_sys->p_info->sequence->width
562                      * p_sys->p_info->sequence->height );
563             memset( p_pic->p[1].p_pixels, 0x80,
564                     p_sys->p_info->sequence->width
565                      * p_sys->p_info->sequence->height / 4 );
566             memset( p_pic->p[2].p_pixels, 0x80,
567                     p_sys->p_info->sequence->width
568                      * p_sys->p_info->sequence->height / 4 );
569
570             if( p_sys->b_slice_i )
571             {
572                 vout_SynchroNewPicture( p_sys->p_synchro,
573                             I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
574                 vout_SynchroDecode( p_sys->p_synchro );
575                 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
576             }
577             break;
578         }
579
580         default:
581             break;
582         }
583     }
584
585     /* Never reached */
586     return NULL;
587 }
588
589 /*****************************************************************************
590  * CloseDecoder: libmpeg2 decoder destruction
591  *****************************************************************************/
592 static void CloseDecoder( vlc_object_t *p_this )
593 {
594     decoder_t *p_dec = (decoder_t *)p_this;
595     decoder_sys_t *p_sys = p_dec->p_sys;
596
597     if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
598
599     if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
600
601     free( p_sys );
602 }
603
604 /*****************************************************************************
605  * GetNewPicture: Get a new picture from the vout and set the buf struct
606  *****************************************************************************/
607 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
608 {
609     decoder_sys_t *p_sys = p_dec->p_sys;
610     picture_t *p_pic;
611
612     p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
613     p_dec->fmt_out.video.i_visible_width =
614         p_sys->p_info->sequence->picture_width;
615     p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
616     p_dec->fmt_out.video.i_visible_height =
617         p_sys->p_info->sequence->picture_height;
618     p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
619
620     if( p_sys->p_info->sequence->frame_period > 0 )
621     {
622         p_dec->fmt_out.video.i_frame_rate =
623             (uint32_t)( (uint64_t)1001000000 * 27 /
624                         p_sys->p_info->sequence->frame_period );
625         p_dec->fmt_out.video.i_frame_rate_base = 1001;
626     }
627
628     p_dec->fmt_out.i_codec =
629         ( p_sys->p_info->sequence->chroma_height <
630           p_sys->p_info->sequence->height ) ?
631         VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
632
633     /* Get a new picture */
634     p_pic = p_dec->pf_vout_buffer_new( p_dec );
635
636     if( p_pic == NULL ) return NULL;
637
638     p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
639         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
640     p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
641         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
642     p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
643         p_sys->p_info->current_picture->nb_fields : 2;
644
645     p_dec->pf_picture_link( p_dec, p_pic );
646
647     pp_buf[0] = p_pic->p[0].p_pixels;
648     pp_buf[1] = p_pic->p[1].p_pixels;
649     pp_buf[2] = p_pic->p[2].p_pixels;
650
651     return p_pic;
652 }