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remove unndeed variables
[vlc/asuraparaju-public.git] / modules / codec / libmpeg2.c
blob11dbb2fec20c14224edf744c0c7e8a69f8fa4792
1 /*****************************************************************************
2 * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
3 *****************************************************************************
4 * Copyright (C) 1999-2001 the VideoLAN team
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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
24
25 /*****************************************************************************
26 * Preamble
27 *****************************************************************************/
28 #ifdef HAVE_CONFIG_H
29 # include "config.h"
30 #endif
31
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
34 #include <vlc_vout.h>
35 #include <vlc_codec.h>
36 #include <vlc_block_helper.h>
37 #include "../codec/cc.h"
38
39 #include <mpeg2.h>
40
41 #include <vlc_codec_synchro.h>
42
43 /*****************************************************************************
44 * decoder_sys_t : libmpeg2 decoder descriptor
45 *****************************************************************************/
46 struct decoder_sys_t
47 {
48 /*
49 * libmpeg2 properties
50 */
51 mpeg2dec_t *p_mpeg2dec;
52 const mpeg2_info_t *p_info;
53 bool b_skip;
54
55 /*
56 * Input properties
57 */
58 mtime_t i_previous_pts;
59 mtime_t i_current_pts;
60 mtime_t i_previous_dts;
61 mtime_t i_current_dts;
62 picture_t * p_picture_to_destroy;
63 bool b_garbage_pic;
64 bool b_after_sequence_header; /* is it the next frame after
65 * the sequence header ? */
66 bool b_slice_i; /* intra-slice refresh stream */
67 bool b_second_field;
68
69 bool b_preroll;
70
71 /*
72 * Output properties
73 */
74 decoder_synchro_t *p_synchro;
75 int i_aspect;
76 int i_sar_num;
77 int i_sar_den;
78 mtime_t i_last_frame_pts;
79
80 /* Closed captioning support */
81 uint32_t i_cc_flags;
82 mtime_t i_cc_pts;
83 mtime_t i_cc_dts;
84 cc_data_t cc;
85 };
86
87 /*****************************************************************************
88 * Local prototypes
89 *****************************************************************************/
90 static int OpenDecoder( vlc_object_t * );
91 static void CloseDecoder( vlc_object_t * );
92
93 static picture_t *DecodeBlock( decoder_t *, block_t ** );
94 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] );
95
96 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
97 static void GetAR( decoder_t *p_dec );
98
99 /*****************************************************************************
100 * Module descriptor
101 *****************************************************************************/
102 vlc_module_begin ()
103 set_description( N_("MPEG I/II video decoder (using libmpeg2)") )
104 set_capability( "decoder", 150 )
105 set_category( CAT_INPUT )
106 set_subcategory( SUBCAT_INPUT_VCODEC )
107 set_callbacks( OpenDecoder, CloseDecoder )
108 add_shortcut( "libmpeg2" )
109 vlc_module_end ()
110
111 /*****************************************************************************
112 * OpenDecoder: probe the decoder and return score
113 *****************************************************************************/
114 static int OpenDecoder( vlc_object_t *p_this )
115 {
116 decoder_t *p_dec = (decoder_t*)p_this;
117 decoder_sys_t *p_sys;
118 uint32_t i_accel = 0;
119
120 if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','v') &&
121 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
122 /* Pinnacle hardware-mpeg1 */
123 p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
124 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','2','v') &&
125 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') &&
126 p_dec->fmt_in.i_codec != VLC_FOURCC('h','d','v','2') )
127 {
128 return VLC_EGENERIC;
129 }
130
131 /* Allocate the memory needed to store the decoder's structure */
132 if( ( p_dec->p_sys = p_sys =
133 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
134 return VLC_ENOMEM;
135
136 /* Initialize the thread properties */
137 memset( p_sys, 0, sizeof(decoder_sys_t) );
138 p_sys->p_mpeg2dec = NULL;
139 p_sys->p_synchro = NULL;
140 p_sys->p_info = NULL;
141 p_sys->i_current_pts = 0;
142 p_sys->i_previous_pts = 0;
143 p_sys->i_current_dts = 0;
144 p_sys->i_previous_dts = 0;
145 p_sys->p_picture_to_destroy = NULL;
146 p_sys->b_garbage_pic = 0;
147 p_sys->b_slice_i = 0;
148 p_sys->b_second_field = 0;
149 p_sys->b_skip = 0;
150 p_sys->b_preroll = false;
151
152 p_sys->i_cc_pts = 0;
153 p_sys->i_cc_dts = 0;
154 p_sys->i_cc_flags = 0;
155 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
156 p_dec->pf_get_cc = GetCc;
157 cc_Init( &p_sys->cc );
158 #endif
159
160 #if defined( __i386__ ) || defined( __x86_64__ )
161 if( vlc_CPU() & CPU_CAPABILITY_MMX )
162 {
163 i_accel |= MPEG2_ACCEL_X86_MMX;
164 }
165
166 if( vlc_CPU() & CPU_CAPABILITY_3DNOW )
167 {
168 i_accel |= MPEG2_ACCEL_X86_3DNOW;
169 }
170
171 if( vlc_CPU() & CPU_CAPABILITY_MMXEXT )
172 {
173 i_accel |= MPEG2_ACCEL_X86_MMXEXT;
174 }
175
176 #elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
177 if( vlc_CPU() & CPU_CAPABILITY_ALTIVEC )
178 {
179 i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
180 }
181
182 #else
183 /* If we do not know this CPU, trust libmpeg2's feature detection */
184 i_accel = MPEG2_ACCEL_DETECT;
185
186 #endif
187
188 /* Set CPU acceleration features */
189 mpeg2_accel( i_accel );
190
191 /* Initialize decoder */
192 p_sys->p_mpeg2dec = mpeg2_init();
193 if( p_sys->p_mpeg2dec == NULL)
194 {
195 msg_Err( p_dec, "mpeg2_init() failed" );
196 free( p_sys );
197 return VLC_EGENERIC;
198 }
199
200 p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
201
202 p_dec->pf_decode_video = DecodeBlock;
203
204 return VLC_SUCCESS;
205 }
206
207 /*****************************************************************************
208 * RunDecoder: the libmpeg2 decoder
209 *****************************************************************************/
210 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
211 {
212 decoder_sys_t *p_sys = p_dec->p_sys;
213 mpeg2_state_t state;
214 picture_t *p_pic;
215
216 block_t *p_block;
217
218 if( !pp_block || !*pp_block ) return NULL;
219
220 p_block = *pp_block;
221
222 while( 1 )
223 {
224 state = mpeg2_parse( p_sys->p_mpeg2dec );
225
226 switch( state )
227 {
228 case STATE_BUFFER:
229 if( !p_block->i_buffer )
230 {
231 block_Release( p_block );
232 return NULL;
233 }
234 if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
235 | BLOCK_FLAG_CORRUPTED))
236 cc_Flush( &p_sys->cc );
237
238 if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
239 | BLOCK_FLAG_CORRUPTED)) &&
240 p_sys->p_synchro &&
241 p_sys->p_info->sequence &&
242 p_sys->p_info->sequence->width != (unsigned)-1 )
243 {
244 decoder_SynchroReset( p_sys->p_synchro );
245 if( p_sys->p_info->current_fbuf != NULL
246 && p_sys->p_info->current_fbuf->id != NULL )
247 {
248 p_sys->b_garbage_pic = 1;
249 p_pic = p_sys->p_info->current_fbuf->id;
250 }
251 else
252 {
253 uint8_t *buf[3];
254 buf[0] = buf[1] = buf[2] = NULL;
255 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
256 {
257 p_block->i_buffer = 0;
258 break;
259 }
260 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
261 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
262 }
263 p_sys->p_picture_to_destroy = p_pic;
264
265 if ( p_sys->b_slice_i )
266 {
267 decoder_SynchroNewPicture( p_sys->p_synchro,
268 I_CODING_TYPE, 2, 0, 0,
269 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
270 decoder_SynchroDecode( p_sys->p_synchro );
271 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
272 }
273 }
274
275 if( p_block->i_flags & BLOCK_FLAG_PREROLL )
276 {
277 p_sys->b_preroll = true;
278 }
279 else if( p_sys->b_preroll )
280 {
281 p_sys->b_preroll = false;
282 /* Reset synchro */
283 decoder_SynchroReset( p_sys->p_synchro );
284 }
285
286 #ifdef PIC_FLAG_PTS
287 if( p_block->i_pts )
288 {
289 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
290
291 #else /* New interface */
292 if( p_block->i_pts || p_block->i_dts )
293 {
294 mpeg2_tag_picture( p_sys->p_mpeg2dec,
295 (uint32_t)p_block->i_pts,
296 (uint32_t)p_block->i_dts );
297 #endif
298 p_sys->i_previous_pts = p_sys->i_current_pts;
299 p_sys->i_current_pts = p_block->i_pts;
300 p_sys->i_previous_dts = p_sys->i_current_dts;
301 p_sys->i_current_dts = p_block->i_dts;
302 }
303
304 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
305 p_block->p_buffer + p_block->i_buffer );
306
307 p_block->i_buffer = 0;
308 break;
309
310 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
311
312 case STATE_SEQUENCE_MODIFIED:
313 GetAR( p_dec );
314 break;
315 #endif
316
317 case STATE_SEQUENCE:
318 {
319 /* Initialize video output */
320 uint8_t *buf[3];
321 buf[0] = buf[1] = buf[2] = NULL;
322
323 GetAR( p_dec );
324
325 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
326
327 /* Set the first 2 reference frames */
328 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
329
330 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
331 {
332 block_Release( p_block );
333 return NULL;
334 }
335
336 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
337 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
338
339 /* This picture will never go through display_picture. */
340 p_pic->date = 0;
341
342 /* For some reason, libmpeg2 will put this pic twice in
343 * discard_picture. This can be considered a bug in libmpeg2. */
344 decoder_LinkPicture( p_dec, p_pic );
345
346 if( p_sys->p_synchro )
347 {
348 decoder_SynchroRelease( p_sys->p_synchro );
349 }
350 p_sys->p_synchro = decoder_SynchroInit( p_dec,
351 (uint32_t)((uint64_t)1001000000 * 27 /
352 p_sys->p_info->sequence->frame_period) );
353 p_sys->b_after_sequence_header = 1;
354 }
355 break;
356
357 case STATE_PICTURE_2ND:
358 p_sys->b_second_field = 1;
359 break;
360
361 case STATE_PICTURE:
362 {
363 uint8_t *buf[3];
364 mtime_t i_pts, i_dts;
365 buf[0] = buf[1] = buf[2] = NULL;
366
367 if ( p_sys->b_after_sequence_header &&
368 ((p_sys->p_info->current_picture->flags &
369 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
370 {
371 /* Intra-slice refresh. Simulate a blank I picture. */
372 msg_Dbg( p_dec, "intra-slice refresh stream" );
373 decoder_SynchroNewPicture( p_sys->p_synchro,
374 I_CODING_TYPE, 2, 0, 0,
375 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
376 decoder_SynchroDecode( p_sys->p_synchro );
377 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
378 p_sys->b_slice_i = 1;
379 }
380 p_sys->b_after_sequence_header = 0;
381
382 #ifdef PIC_FLAG_PTS
383 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
384 ( ( p_sys->p_info->current_picture->pts ==
385 (uint32_t)p_sys->i_current_pts ) ?
386 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
387 i_dts = 0;
388
389 /* Hack to handle demuxers which only have DTS timestamps */
390 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
391 {
392 if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
393 (p_sys->p_info->current_picture->flags &
394 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
395 {
396 i_pts = p_block->i_dts;
397 }
398 }
399 p_block->i_pts = p_block->i_dts = 0;
400 /* End hack */
401
402 #else /* New interface */
403
404 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
405 ( ( p_sys->p_info->current_picture->tag ==
406 (uint32_t)p_sys->i_current_pts ) ?
407 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
408 i_dts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
409 ( ( p_sys->p_info->current_picture->tag2 ==
410 (uint32_t)p_sys->i_current_dts ) ?
411 p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
412 #endif
413
414 /* If nb_fields == 1, it is a field picture, and it will be
415 * followed by another field picture for which we won't call
416 * decoder_SynchroNewPicture() because this would have other
417 * problems, so we take it into account here.
418 * This kind of sucks, but I didn't think better. --Meuuh
419 */
420 decoder_SynchroNewPicture( p_sys->p_synchro,
421 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
422 p_sys->p_info->current_picture->nb_fields == 1 ? 2 :
423 p_sys->p_info->current_picture->nb_fields, i_pts, i_dts,
424 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
425
426
427 bool b_skip = false;
428 if( !p_dec->b_pace_control && !p_sys->b_preroll &&
429 !(p_sys->b_slice_i
430 && ((p_sys->p_info->current_picture->flags
431 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P))
432 && !decoder_SynchroChoose( p_sys->p_synchro,
433 p_sys->p_info->current_picture->flags
434 & PIC_MASK_CODING_TYPE,
435 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
436 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
437 {
438 b_skip = true;
439 }
440
441 p_pic = NULL;
442 if( !b_skip )
443 p_pic = GetNewPicture( p_dec, buf );
444
445 if( b_skip || !p_pic )
446 {
447 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
448 p_sys->b_skip = 1;
449 decoder_SynchroTrash( p_sys->p_synchro );
450 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
451
452 if( !b_skip )
453 {
454 block_Release( p_block );
455 return NULL;
456 }
457 }
458 else
459 {
460 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
461 p_sys->b_skip = 0;
462 decoder_SynchroDecode( p_sys->p_synchro );
463
464 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
465 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
466 }
467 if( p_sys->p_info->user_data_len > 2 )
468 {
469 p_sys->i_cc_pts = i_pts;
470 p_sys->i_cc_dts = i_dts;
471 if( (p_sys->p_info->current_picture->flags
472 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
473 p_sys->i_cc_flags = BLOCK_FLAG_TYPE_P;
474 else if( (p_sys->p_info->current_picture->flags
475 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
476 p_sys->i_cc_flags = BLOCK_FLAG_TYPE_B;
477 else p_sys->i_cc_flags = BLOCK_FLAG_TYPE_I;
478
479 cc_Extract( &p_sys->cc, &p_sys->p_info->user_data[0], p_sys->p_info->user_data_len );
480 }
481 }
482 break;
483
484 case STATE_END:
485 case STATE_SLICE:
486 p_pic = NULL;
487 if( p_sys->p_info->display_fbuf
488 && p_sys->p_info->display_fbuf->id )
489 {
490 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
491
492 decoder_SynchroEnd( p_sys->p_synchro,
493 p_sys->p_info->display_picture->flags
494 & PIC_MASK_CODING_TYPE,
495 p_sys->b_garbage_pic );
496 p_sys->b_garbage_pic = 0;
497
498 if( p_sys->p_picture_to_destroy != p_pic )
499 {
500 p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
501 }
502 else
503 {
504 p_sys->p_picture_to_destroy = NULL;
505 p_pic->date = 0;
506 }
507 }
508
509 if( p_sys->p_info->discard_fbuf &&
510 p_sys->p_info->discard_fbuf->id )
511 {
512 decoder_UnlinkPicture( p_dec,
513 p_sys->p_info->discard_fbuf->id );
514 }
515
516 /* For still frames */
517 if( state == STATE_END && p_pic ) p_pic->b_force = true;
518
519 if( p_pic )
520 {
521 /* Avoid frames with identical timestamps.
522 * Especially needed for still frames in DVD menus. */
523 if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
524 p_sys->i_last_frame_pts = p_pic->date;
525
526 return p_pic;
527 }
528 break;
529
530 case STATE_INVALID:
531 {
532 uint8_t *buf[3];
533 buf[0] = buf[1] = buf[2] = NULL;
534
535 msg_Warn( p_dec, "invalid picture encountered" );
536 if ( ( p_sys->p_info->current_picture == NULL ) ||
537 ( ( p_sys->p_info->current_picture->flags &
538 PIC_MASK_CODING_TYPE) != PIC_FLAG_CODING_TYPE_B ) )
539 {
540 if( p_sys->p_synchro ) decoder_SynchroReset( p_sys->p_synchro );
541 }
542 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
543 p_sys->b_skip = 1;
544 cc_Flush( &p_sys->cc );
545
546 if( p_sys->p_info->current_fbuf &&
547 p_sys->p_info->current_fbuf->id )
548 {
549 p_sys->b_garbage_pic = 1;
550 p_pic = p_sys->p_info->current_fbuf->id;
551 }
552 else if( !p_sys->p_info->sequence )
553 {
554 break;
555 }
556 else
557 {
558 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
559 break;
560 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
561 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
562 }
563 p_sys->p_picture_to_destroy = p_pic;
564
565 memset( p_pic->p[0].p_pixels, 0,
566 p_sys->p_info->sequence->width
567 * p_sys->p_info->sequence->height );
568 memset( p_pic->p[1].p_pixels, 0x80,
569 p_sys->p_info->sequence->width
570 * p_sys->p_info->sequence->height / 4 );
571 memset( p_pic->p[2].p_pixels, 0x80,
572 p_sys->p_info->sequence->width
573 * p_sys->p_info->sequence->height / 4 );
574
575 if( p_sys->b_slice_i )
576 {
577 decoder_SynchroNewPicture( p_sys->p_synchro,
578 I_CODING_TYPE, 2, 0, 0,
579 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
580 decoder_SynchroDecode( p_sys->p_synchro );
581 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
582 }
583 break;
584 }
585
586 default:
587 break;
588 }
589 }
590
591 /* Never reached */
592 return NULL;
593 }
594
595 /*****************************************************************************
596 * CloseDecoder: libmpeg2 decoder destruction
597 *****************************************************************************/
598 static void CloseDecoder( vlc_object_t *p_this )
599 {
600 decoder_t *p_dec = (decoder_t *)p_this;
601 decoder_sys_t *p_sys = p_dec->p_sys;
602
603 if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
604
605 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
606
607 free( p_sys );
608 }
609
610 /*****************************************************************************
611 * GetNewPicture: Get a new picture from the vout and set the buf struct
612 *****************************************************************************/
613 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
614 {
615 decoder_sys_t *p_sys = p_dec->p_sys;
616 picture_t *p_pic;
617
618 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
619 p_dec->fmt_out.video.i_visible_width =
620 p_sys->p_info->sequence->picture_width;
621 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
622 p_dec->fmt_out.video.i_visible_height =
623 p_sys->p_info->sequence->picture_height;
624 p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
625 p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
626 p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
627
628 if( p_sys->p_info->sequence->frame_period > 0 )
629 {
630 p_dec->fmt_out.video.i_frame_rate =
631 (uint32_t)( (uint64_t)1001000000 * 27 /
632 p_sys->p_info->sequence->frame_period );
633 p_dec->fmt_out.video.i_frame_rate_base = 1001;
634 }
635
636 p_dec->fmt_out.i_codec =
637 ( p_sys->p_info->sequence->chroma_height <
638 p_sys->p_info->sequence->height ) ?
639 VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
640
641 /* Get a new picture */
642 p_pic = decoder_NewPicture( p_dec );
643
644 if( p_pic == NULL ) return NULL;
645
646 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
647 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
648 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
649 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
650 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
651 p_sys->p_info->current_picture->nb_fields : 2;
652
653 decoder_LinkPicture( p_dec, p_pic );
654
655 pp_buf[0] = p_pic->p[0].p_pixels;
656 pp_buf[1] = p_pic->p[1].p_pixels;
657 pp_buf[2] = p_pic->p[2].p_pixels;
658
659 return p_pic;
660 }
661
662 /*****************************************************************************
663 * GetCc: Retrieves the Closed Captions for the CC decoder.
664 *****************************************************************************/
665 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] )
666 {
667 decoder_sys_t *p_sys = p_dec->p_sys;
668 block_t *p_cc = NULL;
669 int i;
670
671 for( i = 0; i < 4; i++ )
672 pb_present[i] = p_sys->cc.pb_present[i];
673
674 if( p_sys->cc.i_data <= 0 )
675 return NULL;
676
677 p_cc = block_New( p_dec, p_sys->cc.i_data);
678 if( p_cc )
679 {
680 memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
681 p_cc->i_dts =
682 p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
683 p_cc->i_flags = ( p_sys->cc.b_reorder ? p_sys->i_cc_flags : BLOCK_FLAG_TYPE_P ) & ( BLOCK_FLAG_TYPE_I|BLOCK_FLAG_TYPE_P|BLOCK_FLAG_TYPE_B);
684 }
685 cc_Flush( &p_sys->cc );
686 return p_cc;
687 }
688
689 /*****************************************************************************
690 * GetAR: Get aspect ratio
691 *****************************************************************************/
692 static void GetAR( decoder_t *p_dec )
693 {
694 decoder_sys_t *p_sys = p_dec->p_sys;
695
696 /* Check whether the input gave a particular aspect ratio */
697 if( p_dec->fmt_in.video.i_aspect )
698 {
699 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
700 }
701 else
702 {
703 /* Use the value provided in the MPEG sequence header */
704 if( p_sys->p_info->sequence->pixel_height > 0 )
705 {
706 p_sys->i_aspect =
707 ((uint64_t)p_sys->p_info->sequence->picture_width) *
708 p_sys->p_info->sequence->pixel_width *
709 VOUT_ASPECT_FACTOR /
710 p_sys->p_info->sequence->picture_height /
711 p_sys->p_info->sequence->pixel_height;
712 p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
713 p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
714 }
715 else
716 {
717 /* Invalid aspect, assume 4:3.
718 * This shouldn't happen and if it does it is a bug
719 * in libmpeg2 (likely triggered by an invalid stream) */
720 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
721 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
722 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
723 }
724 }
725
726 msg_Dbg( p_dec, "%dx%d (display %d,%d), aspect %d, sar %i:%i, %u.%03u fps",
727 p_sys->p_info->sequence->picture_width,
728 p_sys->p_info->sequence->picture_height,
729 p_sys->p_info->sequence->display_width,
730 p_sys->p_info->sequence->display_height,
731 p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
732 (uint32_t)((uint64_t)1001000000 * 27 /
733 p_sys->p_info->sequence->frame_period / 1001),
734 (uint32_t)((uint64_t)1001000000 * 27 /
735 p_sys->p_info->sequence->frame_period % 1001) );
736 }