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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
30 #include <vlc/decoder.h>
32 #include <mpeg2dec/mpeg2.h>
34 #include "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_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) */
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 */
73 vout_synchro_t *p_synchro;
75 mtime_t i_last_frame_pts;
79 /*****************************************************************************
81 *****************************************************************************/
82 static int OpenDecoder( vlc_object_t * );
83 static void CloseDecoder( vlc_object_t * );
85 static picture_t *DecodeBlock( decoder_t *, block_t ** );
87 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
88 static void GetAR( decoder_t *p_dec );
90 /*****************************************************************************
92 *****************************************************************************/
94 set_description( _("MPEG I/II video decoder (using libmpeg2)") );
95 set_capability( "decoder", 150 );
96 set_category( CAT_INPUT );
97 set_subcategory( SUBCAT_INPUT_VCODEC );
98 set_callbacks( OpenDecoder, CloseDecoder );
99 add_shortcut( "libmpeg2" );
102 /*****************************************************************************
103 * OpenDecoder: probe the decoder and return score
104 *****************************************************************************/
105 static int OpenDecoder( vlc_object_t *p_this )
107 decoder_t *p_dec = (decoder_t*)p_this;
108 decoder_sys_t *p_sys;
109 uint32_t i_accel = 0;
111 if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','v') &&
112 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
113 /* Pinnacle hardware-mpeg1 */
114 p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
116 p_dec->fmt_in.i_codec != VLC_FOURCC('V','C','R','2') &&
117 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') &&
118 p_dec->fmt_in.i_codec != VLC_FOURCC('h','d','v','2') )
123 /* Allocate the memory needed to store the decoder's structure */
124 if( ( p_dec->p_sys = p_sys =
125 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
127 msg_Err( p_dec, "out of memory" );
131 /* Initialize the thread properties */
132 memset( p_sys, 0, sizeof(decoder_sys_t) );
133 p_sys->p_mpeg2dec = NULL;
134 p_sys->p_synchro = NULL;
135 p_sys->p_info = NULL;
136 p_sys->i_current_pts = 0;
137 p_sys->i_previous_pts = 0;
138 p_sys->i_current_dts = 0;
139 p_sys->i_previous_dts = 0;
140 p_sys->p_picture_to_destroy = NULL;
141 p_sys->b_garbage_pic = 0;
142 p_sys->b_slice_i = 0;
144 p_sys->b_preroll = VLC_FALSE;
146 #if defined( __i386__ ) || defined( __x86_64__ )
147 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMX )
149 i_accel |= MPEG2_ACCEL_X86_MMX;
152 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_3DNOW )
154 i_accel |= MPEG2_ACCEL_X86_3DNOW;
157 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMXEXT )
159 i_accel |= MPEG2_ACCEL_X86_MMXEXT;
162 #elif defined( __powerpc__ ) || defined( SYS_DARWIN )
163 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_ALTIVEC )
165 i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
169 /* If we do not know this CPU, trust libmpeg2's feature detection */
170 i_accel = MPEG2_ACCEL_DETECT;
174 /* Set CPU acceleration features */
175 mpeg2_accel( i_accel );
177 /* Initialize decoder */
178 p_sys->p_mpeg2dec = mpeg2_init();
179 if( p_sys->p_mpeg2dec == NULL)
181 msg_Err( p_dec, "mpeg2_init() failed" );
186 p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
188 p_dec->pf_decode_video = DecodeBlock;
193 /*****************************************************************************
194 * RunDecoder: the libmpeg2 decoder
195 *****************************************************************************/
196 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
198 decoder_sys_t *p_sys = p_dec->p_sys;
204 if( !pp_block || !*pp_block ) return NULL;
210 state = mpeg2_parse( p_sys->p_mpeg2dec );
215 if( !p_block->i_buffer )
217 block_Release( p_block );
221 if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
222 | BLOCK_FLAG_CORRUPTED)) &&
224 p_sys->p_info->sequence &&
225 p_sys->p_info->sequence->width != (unsigned)-1 )
227 vout_SynchroReset( p_sys->p_synchro );
228 if( p_sys->p_info->current_fbuf != NULL
229 && p_sys->p_info->current_fbuf->id != NULL )
231 p_sys->b_garbage_pic = 1;
232 p_pic = p_sys->p_info->current_fbuf->id;
237 buf[0] = buf[1] = buf[2] = NULL;
238 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
240 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
242 p_sys->p_picture_to_destroy = p_pic;
244 if ( p_sys->b_slice_i )
246 vout_SynchroNewPicture( p_sys->p_synchro,
247 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
248 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
249 vout_SynchroDecode( p_sys->p_synchro );
250 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
254 if( p_block->i_flags & BLOCK_FLAG_PREROLL )
256 p_sys->b_preroll = VLC_TRUE;
258 else if( p_sys->b_preroll )
260 p_sys->b_preroll = VLC_FALSE;
262 vout_SynchroReset( p_sys->p_synchro );
268 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
270 #else /* New interface */
271 if( p_block->i_pts || p_block->i_dts )
273 mpeg2_tag_picture( p_sys->p_mpeg2dec,
274 (uint32_t)p_block->i_pts,
275 (uint32_t)p_block->i_dts );
277 p_sys->i_previous_pts = p_sys->i_current_pts;
278 p_sys->i_current_pts = p_block->i_pts;
279 p_sys->i_previous_dts = p_sys->i_current_dts;
280 p_sys->i_current_dts = p_block->i_dts;
283 p_sys->i_current_rate = p_block->i_rate;
285 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
286 p_block->p_buffer + p_block->i_buffer );
288 p_block->i_buffer = 0;
291 #ifdef STATE_SEQUENCE_MODIFIED
292 case STATE_SEQUENCE_MODIFIED:
299 /* Initialize video output */
301 buf[0] = buf[1] = buf[2] = NULL;
305 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
307 /* Set the first 2 reference frames */
308 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
310 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
312 block_Release( p_block );
316 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
318 /* This picture will never go through display_picture. */
321 /* For some reason, libmpeg2 will put this pic twice in
322 * discard_picture. This can be considered a bug in libmpeg2. */
323 p_dec->pf_picture_link( p_dec, p_pic );
325 if( p_sys->p_synchro )
327 vout_SynchroRelease( p_sys->p_synchro );
329 p_sys->p_synchro = vout_SynchroInit( p_dec,
330 (uint32_t)((uint64_t)1001000000 * 27 /
331 p_sys->p_info->sequence->frame_period) );
332 p_sys->b_after_sequence_header = 1;
336 case STATE_PICTURE_2ND:
337 vout_SynchroNewPicture( p_sys->p_synchro,
338 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
339 p_sys->p_info->current_picture->nb_fields,
340 0, 0, p_sys->i_current_rate,
341 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
345 vout_SynchroTrash( p_sys->p_synchro );
349 vout_SynchroDecode( p_sys->p_synchro );
356 mtime_t i_pts, i_dts;
357 buf[0] = buf[1] = buf[2] = NULL;
359 if ( p_sys->b_after_sequence_header &&
360 ((p_sys->p_info->current_picture->flags &
361 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
363 /* Intra-slice refresh. Simulate a blank I picture. */
364 msg_Dbg( p_dec, "intra-slice refresh stream" );
365 vout_SynchroNewPicture( p_sys->p_synchro,
366 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
367 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
368 vout_SynchroDecode( p_sys->p_synchro );
369 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
370 p_sys->b_slice_i = 1;
372 p_sys->b_after_sequence_header = 0;
375 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
376 ( ( p_sys->p_info->current_picture->pts ==
377 (uint32_t)p_sys->i_current_pts ) ?
378 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
381 /* Hack to handle demuxers which only have DTS timestamps */
382 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
384 if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
385 (p_sys->p_info->current_picture->flags &
386 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
388 i_pts = p_block->i_dts;
391 p_block->i_pts = p_block->i_dts = 0;
394 #else /* New interface */
396 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
397 ( ( p_sys->p_info->current_picture->tag ==
398 (uint32_t)p_sys->i_current_pts ) ?
399 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
400 i_dts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
401 ( ( p_sys->p_info->current_picture->tag2 ==
402 (uint32_t)p_sys->i_current_dts ) ?
403 p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
406 vout_SynchroNewPicture( p_sys->p_synchro,
407 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
408 p_sys->p_info->current_picture->nb_fields, i_pts, i_dts,
409 p_sys->i_current_rate,
410 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
412 if( !p_dec->b_pace_control && !p_sys->b_preroll &&
414 && ((p_sys->p_info->current_picture->flags
415 & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
416 && !vout_SynchroChoose( p_sys->p_synchro,
417 p_sys->p_info->current_picture->flags
418 & PIC_MASK_CODING_TYPE,
419 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
420 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
422 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
424 vout_SynchroTrash( p_sys->p_synchro );
425 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
429 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
431 vout_SynchroDecode( p_sys->p_synchro );
433 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
435 block_Release( p_block );
439 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
447 if( p_sys->p_info->display_fbuf
448 && p_sys->p_info->display_fbuf->id )
450 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
452 vout_SynchroEnd( p_sys->p_synchro,
453 p_sys->p_info->display_picture->flags
454 & PIC_MASK_CODING_TYPE,
455 p_sys->b_garbage_pic );
456 p_sys->b_garbage_pic = 0;
458 if ( p_sys->p_picture_to_destroy != p_pic )
460 p_pic->date = vout_SynchroDate( p_sys->p_synchro );
464 p_sys->p_picture_to_destroy = NULL;
469 if( p_sys->p_info->discard_fbuf &&
470 p_sys->p_info->discard_fbuf->id )
472 p_dec->pf_picture_unlink( p_dec,
473 p_sys->p_info->discard_fbuf->id );
476 /* For still frames */
477 if( state == STATE_END && p_pic ) p_pic->b_force = VLC_TRUE;
481 /* Avoid frames with identical timestamps.
482 * Especially needed for still frames in DVD menus. */
483 if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
484 p_sys->i_last_frame_pts = p_pic->date;
494 buf[0] = buf[1] = buf[2] = NULL;
496 msg_Warn( p_dec, "invalid picture encountered" );
497 if ( ( p_sys->p_info->current_picture == NULL ) ||
498 ( ( p_sys->p_info->current_picture->flags &
499 PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
501 if( p_sys->p_synchro ) vout_SynchroReset( p_sys->p_synchro );
503 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
506 if( p_sys->p_info->current_fbuf &&
507 p_sys->p_info->current_fbuf->id )
509 p_sys->b_garbage_pic = 1;
510 p_pic = p_sys->p_info->current_fbuf->id;
512 else if( !p_sys->p_info->sequence )
518 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
520 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
522 p_sys->p_picture_to_destroy = p_pic;
524 memset( p_pic->p[0].p_pixels, 0,
525 p_sys->p_info->sequence->width
526 * p_sys->p_info->sequence->height );
527 memset( p_pic->p[1].p_pixels, 0x80,
528 p_sys->p_info->sequence->width
529 * p_sys->p_info->sequence->height / 4 );
530 memset( p_pic->p[2].p_pixels, 0x80,
531 p_sys->p_info->sequence->width
532 * p_sys->p_info->sequence->height / 4 );
534 if( p_sys->b_slice_i )
536 vout_SynchroNewPicture( p_sys->p_synchro,
537 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
538 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
539 vout_SynchroDecode( p_sys->p_synchro );
540 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
554 /*****************************************************************************
555 * CloseDecoder: libmpeg2 decoder destruction
556 *****************************************************************************/
557 static void CloseDecoder( vlc_object_t *p_this )
559 decoder_t *p_dec = (decoder_t *)p_this;
560 decoder_sys_t *p_sys = p_dec->p_sys;
562 if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
564 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
569 /*****************************************************************************
570 * GetNewPicture: Get a new picture from the vout and set the buf struct
571 *****************************************************************************/
572 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
574 decoder_sys_t *p_sys = p_dec->p_sys;
577 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
578 p_dec->fmt_out.video.i_visible_width =
579 p_sys->p_info->sequence->picture_width;
580 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
581 p_dec->fmt_out.video.i_visible_height =
582 p_sys->p_info->sequence->picture_height;
583 p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
585 if( p_sys->p_info->sequence->frame_period > 0 )
587 p_dec->fmt_out.video.i_frame_rate =
588 (uint32_t)( (uint64_t)1001000000 * 27 /
589 p_sys->p_info->sequence->frame_period );
590 p_dec->fmt_out.video.i_frame_rate_base = 1001;
593 p_dec->fmt_out.i_codec =
594 ( p_sys->p_info->sequence->chroma_height <
595 p_sys->p_info->sequence->height ) ?
596 VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
598 /* Get a new picture */
599 p_pic = p_dec->pf_vout_buffer_new( p_dec );
601 if( p_pic == NULL ) return NULL;
603 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
604 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
605 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
606 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
607 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
608 p_sys->p_info->current_picture->nb_fields : 2;
610 p_dec->pf_picture_link( p_dec, p_pic );
612 pp_buf[0] = p_pic->p[0].p_pixels;
613 pp_buf[1] = p_pic->p[1].p_pixels;
614 pp_buf[2] = p_pic->p[2].p_pixels;
619 /*****************************************************************************
620 * GetAR: Get aspect ratio
621 *****************************************************************************/
622 static void GetAR( decoder_t *p_dec )
624 decoder_sys_t *p_sys = p_dec->p_sys;
626 /* Check whether the input gave a particular aspect ratio */
627 if( p_dec->fmt_in.video.i_aspect )
629 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
630 if( p_sys->i_aspect <= AR_221_1_PICTURE )
631 switch( p_sys->i_aspect )
634 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
636 case AR_16_9_PICTURE:
637 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
639 case AR_221_1_PICTURE:
640 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
642 case AR_SQUARE_PICTURE:
643 p_sys->i_aspect = VOUT_ASPECT_FACTOR *
644 p_sys->p_info->sequence->width /
645 p_sys->p_info->sequence->height;
651 /* Use the value provided in the MPEG sequence header */
652 if( p_sys->p_info->sequence->pixel_height > 0 )
655 ((uint64_t)p_sys->p_info->sequence->display_width) *
656 p_sys->p_info->sequence->pixel_width *
658 p_sys->p_info->sequence->display_height /
659 p_sys->p_info->sequence->pixel_height;
663 /* Invalid aspect, assume 4:3.
664 * This shouldn't happen and if it does it is a bug
665 * in libmpeg2 (likely triggered by an invalid stream) */
666 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
670 msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
671 p_sys->p_info->sequence->width,
672 p_sys->p_info->sequence->height, p_sys->i_aspect,
673 (uint32_t)((uint64_t)1001000000 * 27 /
674 p_sys->p_info->sequence->frame_period / 1001),
675 (uint32_t)((uint64_t)1001000000 * 27 /
676 p_sys->p_info->sequence->frame_period % 1001) );