1 /*****************************************************************************
2 * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
3 *****************************************************************************
4 * Copyright (C) 1999-2001 the VideoLAN team
7 * Authors: Gildas Bazin <gbazin@videolan.org>
8 * Christophe Massiot <massiot@via.ecp.fr>
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.
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.
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 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
30 #include <vlc_codec.h>
32 #include <mpeg2dec/mpeg2.h>
34 #include <vlc_vout_synchro.h>
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_4_3_PICTURE 2 /* 4:3 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) */
42 /*****************************************************************************
43 * decoder_sys_t : libmpeg2 decoder descriptor
44 *****************************************************************************/
50 mpeg2dec_t *p_mpeg2dec;
51 const mpeg2_info_t *p_info;
57 mtime_t i_previous_pts;
58 mtime_t i_current_pts;
59 mtime_t i_previous_dts;
60 mtime_t i_current_dts;
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 vlc_bool_t b_second_field;
74 vout_synchro_t *p_synchro;
78 mtime_t i_last_frame_pts;
82 /*****************************************************************************
84 *****************************************************************************/
85 static int OpenDecoder( vlc_object_t * );
86 static void CloseDecoder( vlc_object_t * );
88 static picture_t *DecodeBlock( decoder_t *, block_t ** );
90 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
91 static void GetAR( decoder_t *p_dec );
93 /*****************************************************************************
95 *****************************************************************************/
97 set_description( _("MPEG I/II video decoder (using libmpeg2)") );
98 set_capability( "decoder", 150 );
99 set_category( CAT_INPUT );
100 set_subcategory( SUBCAT_INPUT_VCODEC );
101 set_callbacks( OpenDecoder, CloseDecoder );
102 add_shortcut( "libmpeg2" );
105 /*****************************************************************************
106 * OpenDecoder: probe the decoder and return score
107 *****************************************************************************/
108 static int OpenDecoder( vlc_object_t *p_this )
110 decoder_t *p_dec = (decoder_t*)p_this;
111 decoder_sys_t *p_sys;
112 uint32_t i_accel = 0;
114 if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','v') &&
115 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
116 /* Pinnacle hardware-mpeg1 */
117 p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
119 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','2','v') &&
120 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') &&
121 p_dec->fmt_in.i_codec != VLC_FOURCC('h','d','v','2') )
126 /* Allocate the memory needed to store the decoder's structure */
127 if( ( p_dec->p_sys = p_sys =
128 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
130 msg_Err( p_dec, "out of memory" );
134 /* Initialize the thread properties */
135 memset( p_sys, 0, sizeof(decoder_sys_t) );
136 p_sys->p_mpeg2dec = NULL;
137 p_sys->p_synchro = NULL;
138 p_sys->p_info = NULL;
139 p_sys->i_current_pts = 0;
140 p_sys->i_previous_pts = 0;
141 p_sys->i_current_dts = 0;
142 p_sys->i_previous_dts = 0;
143 p_sys->p_picture_to_destroy = NULL;
144 p_sys->b_garbage_pic = 0;
145 p_sys->b_slice_i = 0;
146 p_sys->b_second_field = 0;
148 p_sys->b_preroll = VLC_FALSE;
150 #if defined( __i386__ ) || defined( __x86_64__ )
151 if( vlc_CPU() & CPU_CAPABILITY_MMX )
153 i_accel |= MPEG2_ACCEL_X86_MMX;
156 if( vlc_CPU() & CPU_CAPABILITY_3DNOW )
158 i_accel |= MPEG2_ACCEL_X86_3DNOW;
161 if( vlc_CPU() & CPU_CAPABILITY_MMXEXT )
163 i_accel |= MPEG2_ACCEL_X86_MMXEXT;
166 #elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
167 if( vlc_CPU() & CPU_CAPABILITY_ALTIVEC )
169 i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
173 /* If we do not know this CPU, trust libmpeg2's feature detection */
174 i_accel = MPEG2_ACCEL_DETECT;
178 /* Set CPU acceleration features */
179 mpeg2_accel( i_accel );
181 /* Initialize decoder */
182 p_sys->p_mpeg2dec = mpeg2_init();
183 if( p_sys->p_mpeg2dec == NULL)
185 msg_Err( p_dec, "mpeg2_init() failed" );
190 p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
192 p_dec->pf_decode_video = DecodeBlock;
197 /*****************************************************************************
198 * RunDecoder: the libmpeg2 decoder
199 *****************************************************************************/
200 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
202 decoder_sys_t *p_sys = p_dec->p_sys;
208 if( !pp_block || !*pp_block ) return NULL;
214 state = mpeg2_parse( p_sys->p_mpeg2dec );
219 if( !p_block->i_buffer )
221 block_Release( p_block );
225 if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
226 | BLOCK_FLAG_CORRUPTED)) &&
228 p_sys->p_info->sequence &&
229 p_sys->p_info->sequence->width != (unsigned)-1 )
231 vout_SynchroReset( p_sys->p_synchro );
232 if( p_sys->p_info->current_fbuf != NULL
233 && p_sys->p_info->current_fbuf->id != NULL )
235 p_sys->b_garbage_pic = 1;
236 p_pic = p_sys->p_info->current_fbuf->id;
241 buf[0] = buf[1] = buf[2] = NULL;
242 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
244 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
245 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
247 p_sys->p_picture_to_destroy = p_pic;
249 if ( p_sys->b_slice_i )
251 vout_SynchroNewPicture( p_sys->p_synchro,
252 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
253 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
254 vout_SynchroDecode( p_sys->p_synchro );
255 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
259 if( p_block->i_flags & BLOCK_FLAG_PREROLL )
261 p_sys->b_preroll = VLC_TRUE;
263 else if( p_sys->b_preroll )
265 p_sys->b_preroll = VLC_FALSE;
267 vout_SynchroReset( p_sys->p_synchro );
273 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
275 #else /* New interface */
276 if( p_block->i_pts || p_block->i_dts )
278 mpeg2_tag_picture( p_sys->p_mpeg2dec,
279 (uint32_t)p_block->i_pts,
280 (uint32_t)p_block->i_dts );
282 p_sys->i_previous_pts = p_sys->i_current_pts;
283 p_sys->i_current_pts = p_block->i_pts;
284 p_sys->i_previous_dts = p_sys->i_current_dts;
285 p_sys->i_current_dts = p_block->i_dts;
288 p_sys->i_current_rate = p_block->i_rate;
290 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
291 p_block->p_buffer + p_block->i_buffer );
293 p_block->i_buffer = 0;
296 #ifdef STATE_SEQUENCE_MODIFIED
297 /* FIXME - the above ifdef is always FALSE, even with libmpeg2-0.5.0
298 * Need to improve the implementation to avoid invalid/unref pictures */
300 case STATE_SEQUENCE_MODIFIED:
307 /* Initialize video output */
309 buf[0] = buf[1] = buf[2] = NULL;
313 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
315 /* Set the first 2 reference frames */
316 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
318 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
320 block_Release( p_block );
324 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
325 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
327 /* This picture will never go through display_picture. */
330 /* For some reason, libmpeg2 will put this pic twice in
331 * discard_picture. This can be considered a bug in libmpeg2. */
332 p_dec->pf_picture_link( p_dec, p_pic );
334 if( p_sys->p_synchro )
336 vout_SynchroRelease( p_sys->p_synchro );
338 p_sys->p_synchro = vout_SynchroInit( p_dec,
339 (uint32_t)((uint64_t)1001000000 * 27 /
340 p_sys->p_info->sequence->frame_period) );
341 p_sys->b_after_sequence_header = 1;
345 case STATE_PICTURE_2ND:
346 p_sys->b_second_field = 1;
352 mtime_t i_pts, i_dts;
353 buf[0] = buf[1] = buf[2] = NULL;
355 if ( p_sys->b_after_sequence_header &&
356 ((p_sys->p_info->current_picture->flags &
357 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
359 /* Intra-slice refresh. Simulate a blank I picture. */
360 msg_Dbg( p_dec, "intra-slice refresh stream" );
361 vout_SynchroNewPicture( p_sys->p_synchro,
362 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
363 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
364 vout_SynchroDecode( p_sys->p_synchro );
365 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
366 p_sys->b_slice_i = 1;
368 p_sys->b_after_sequence_header = 0;
371 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
372 ( ( p_sys->p_info->current_picture->pts ==
373 (uint32_t)p_sys->i_current_pts ) ?
374 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
377 /* Hack to handle demuxers which only have DTS timestamps */
378 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
380 if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
381 (p_sys->p_info->current_picture->flags &
382 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
384 i_pts = p_block->i_dts;
387 p_block->i_pts = p_block->i_dts = 0;
390 #else /* New interface */
392 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
393 ( ( p_sys->p_info->current_picture->tag ==
394 (uint32_t)p_sys->i_current_pts ) ?
395 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
396 i_dts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
397 ( ( p_sys->p_info->current_picture->tag2 ==
398 (uint32_t)p_sys->i_current_dts ) ?
399 p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
402 /* If nb_fields == 1, it is a field picture, and it will be
403 * followed by another field picture for which we won't call
404 * vout_SynchroNewPicture() because this would have other
405 * problems, so we take it into account here.
406 * This kind of sucks, but I didn't think better. --Meuuh
408 vout_SynchroNewPicture( p_sys->p_synchro,
409 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
410 p_sys->p_info->current_picture->nb_fields == 1 ? 2 :
411 p_sys->p_info->current_picture->nb_fields, i_pts, i_dts,
412 p_sys->i_current_rate,
413 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
415 if( !p_dec->b_pace_control && !p_sys->b_preroll &&
417 && ((p_sys->p_info->current_picture->flags
418 & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
419 && !vout_SynchroChoose( p_sys->p_synchro,
420 p_sys->p_info->current_picture->flags
421 & PIC_MASK_CODING_TYPE,
422 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
423 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
425 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
427 vout_SynchroTrash( p_sys->p_synchro );
428 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
432 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
434 vout_SynchroDecode( p_sys->p_synchro );
436 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
438 block_Release( p_block );
442 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
443 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
451 if( p_sys->p_info->display_fbuf
452 && p_sys->p_info->display_fbuf->id )
454 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
456 vout_SynchroEnd( p_sys->p_synchro,
457 p_sys->p_info->display_picture->flags
458 & PIC_MASK_CODING_TYPE,
459 p_sys->b_garbage_pic );
460 p_sys->b_garbage_pic = 0;
462 if ( p_sys->p_picture_to_destroy != p_pic )
464 p_pic->date = vout_SynchroDate( p_sys->p_synchro );
468 p_sys->p_picture_to_destroy = NULL;
473 if( p_sys->p_info->discard_fbuf &&
474 p_sys->p_info->discard_fbuf->id )
476 p_dec->pf_picture_unlink( p_dec,
477 p_sys->p_info->discard_fbuf->id );
480 /* For still frames */
481 if( state == STATE_END && p_pic ) p_pic->b_force = VLC_TRUE;
485 /* Avoid frames with identical timestamps.
486 * Especially needed for still frames in DVD menus. */
487 if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
488 p_sys->i_last_frame_pts = p_pic->date;
498 buf[0] = buf[1] = buf[2] = NULL;
500 msg_Warn( p_dec, "invalid picture encountered" );
501 if ( ( p_sys->p_info->current_picture == NULL ) ||
502 ( ( p_sys->p_info->current_picture->flags &
503 PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
505 if( p_sys->p_synchro ) vout_SynchroReset( p_sys->p_synchro );
507 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
510 if( p_sys->p_info->current_fbuf &&
511 p_sys->p_info->current_fbuf->id )
513 p_sys->b_garbage_pic = 1;
514 p_pic = p_sys->p_info->current_fbuf->id;
516 else if( !p_sys->p_info->sequence )
522 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
524 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
525 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
527 p_sys->p_picture_to_destroy = p_pic;
529 memset( p_pic->p[0].p_pixels, 0,
530 p_sys->p_info->sequence->width
531 * p_sys->p_info->sequence->height );
532 memset( p_pic->p[1].p_pixels, 0x80,
533 p_sys->p_info->sequence->width
534 * p_sys->p_info->sequence->height / 4 );
535 memset( p_pic->p[2].p_pixels, 0x80,
536 p_sys->p_info->sequence->width
537 * p_sys->p_info->sequence->height / 4 );
539 if( p_sys->b_slice_i )
541 vout_SynchroNewPicture( p_sys->p_synchro,
542 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
543 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
544 vout_SynchroDecode( p_sys->p_synchro );
545 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
559 /*****************************************************************************
560 * CloseDecoder: libmpeg2 decoder destruction
561 *****************************************************************************/
562 static void CloseDecoder( vlc_object_t *p_this )
564 decoder_t *p_dec = (decoder_t *)p_this;
565 decoder_sys_t *p_sys = p_dec->p_sys;
567 if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
569 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
574 /*****************************************************************************
575 * GetNewPicture: Get a new picture from the vout and set the buf struct
576 *****************************************************************************/
577 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
579 decoder_sys_t *p_sys = p_dec->p_sys;
582 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
583 p_dec->fmt_out.video.i_visible_width =
584 p_sys->p_info->sequence->picture_width;
585 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
586 p_dec->fmt_out.video.i_visible_height =
587 p_sys->p_info->sequence->picture_height;
588 p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
589 p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
590 p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
592 if( p_sys->p_info->sequence->frame_period > 0 )
594 p_dec->fmt_out.video.i_frame_rate =
595 (uint32_t)( (uint64_t)1001000000 * 27 /
596 p_sys->p_info->sequence->frame_period );
597 p_dec->fmt_out.video.i_frame_rate_base = 1001;
600 p_dec->fmt_out.i_codec =
601 ( p_sys->p_info->sequence->chroma_height <
602 p_sys->p_info->sequence->height ) ?
603 VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
605 /* Get a new picture */
606 p_pic = p_dec->pf_vout_buffer_new( p_dec );
608 if( p_pic == NULL ) return NULL;
610 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
611 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
612 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
613 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
614 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
615 p_sys->p_info->current_picture->nb_fields : 2;
617 p_dec->pf_picture_link( p_dec, p_pic );
619 pp_buf[0] = p_pic->p[0].p_pixels;
620 pp_buf[1] = p_pic->p[1].p_pixels;
621 pp_buf[2] = p_pic->p[2].p_pixels;
626 /*****************************************************************************
627 * GetAR: Get aspect ratio
628 *****************************************************************************/
629 static void GetAR( decoder_t *p_dec )
631 decoder_sys_t *p_sys = p_dec->p_sys;
633 /* Check whether the input gave a particular aspect ratio */
634 if( p_dec->fmt_in.video.i_aspect )
636 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
637 if( p_sys->i_aspect <= AR_221_1_PICTURE )
638 switch( p_sys->i_aspect )
641 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
642 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
643 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
645 case AR_16_9_PICTURE:
646 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
647 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 16;
648 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 9;
650 case AR_221_1_PICTURE:
651 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
652 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 221;
653 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 100;
655 case AR_SQUARE_PICTURE:
656 p_sys->i_aspect = VOUT_ASPECT_FACTOR *
657 p_sys->p_info->sequence->picture_width /
658 p_sys->p_info->sequence->picture_height;
659 p_sys->i_sar_num = p_sys->i_sar_den = 1;
665 /* Use the value provided in the MPEG sequence header */
666 if( p_sys->p_info->sequence->pixel_height > 0 )
669 ((uint64_t)p_sys->p_info->sequence->picture_width) *
670 p_sys->p_info->sequence->pixel_width *
672 p_sys->p_info->sequence->picture_height /
673 p_sys->p_info->sequence->pixel_height;
674 p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
675 p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
679 /* Invalid aspect, assume 4:3.
680 * This shouldn't happen and if it does it is a bug
681 * in libmpeg2 (likely triggered by an invalid stream) */
682 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
683 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
684 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
688 msg_Dbg( p_dec, "%dx%d (display %d,%d), aspect %d, sar %i:%i, %u.%03u fps",
689 p_sys->p_info->sequence->picture_width,
690 p_sys->p_info->sequence->picture_height,
691 p_sys->p_info->sequence->display_width,
692 p_sys->p_info->sequence->display_height,
693 p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
694 (uint32_t)((uint64_t)1001000000 * 27 /
695 p_sys->p_info->sequence->frame_period / 1001),
696 (uint32_t)((uint64_t)1001000000 * 27 /
697 p_sys->p_info->sequence->frame_period % 1001) );