1 /*****************************************************************************
2 * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
3 *****************************************************************************
4 * Copyright (C) 1999-2001 VideoLAN
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 ** );
89 /*****************************************************************************
91 *****************************************************************************/
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" );
101 /*****************************************************************************
102 * OpenDecoder: probe the decoder and return score
103 *****************************************************************************/
104 static int OpenDecoder( vlc_object_t *p_this )
106 decoder_t *p_dec = (decoder_t*)p_this;
107 decoder_sys_t *p_sys;
108 uint32_t i_accel = 0;
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') &&
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') )
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 )
125 msg_Err( p_dec, "out of memory" );
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;
142 p_sys->b_preroll = VLC_FALSE;
144 #if defined( __i386__ ) || defined( __x86_64__ )
145 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMX )
147 i_accel |= MPEG2_ACCEL_X86_MMX;
150 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_3DNOW )
152 i_accel |= MPEG2_ACCEL_X86_3DNOW;
155 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMXEXT )
157 i_accel |= MPEG2_ACCEL_X86_MMXEXT;
160 #elif defined( __powerpc__ ) || defined( SYS_DARWIN )
161 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_ALTIVEC )
163 i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
167 /* If we do not know this CPU, trust libmpeg2's feature detection */
168 i_accel = MPEG2_ACCEL_DETECT;
172 /* Set CPU acceleration features */
173 mpeg2_accel( i_accel );
175 /* Initialize decoder */
176 p_sys->p_mpeg2dec = mpeg2_init();
177 if( p_sys->p_mpeg2dec == NULL)
179 msg_Err( p_dec, "mpeg2_init() failed" );
184 p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
186 p_dec->pf_decode_video = DecodeBlock;
191 /*****************************************************************************
192 * RunDecoder: the libmpeg2 decoder
193 *****************************************************************************/
194 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
196 decoder_sys_t *p_sys = p_dec->p_sys;
202 if( !pp_block || !*pp_block ) return NULL;
208 state = mpeg2_parse( p_sys->p_mpeg2dec );
213 if( !p_block->i_buffer )
215 block_Release( p_block );
219 if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
220 | BLOCK_FLAG_CORRUPTED)) &&
222 p_sys->p_info->sequence &&
223 p_sys->p_info->sequence->width != (unsigned)-1 )
225 vout_SynchroReset( p_sys->p_synchro );
226 if( p_sys->p_info->current_fbuf != NULL
227 && p_sys->p_info->current_fbuf->id != NULL )
229 p_sys->b_garbage_pic = 1;
230 p_pic = p_sys->p_info->current_fbuf->id;
235 buf[0] = buf[1] = buf[2] = NULL;
236 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
238 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
240 p_sys->p_picture_to_destroy = p_pic;
242 if ( p_sys->b_slice_i )
244 vout_SynchroNewPicture( p_sys->p_synchro,
245 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
246 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
247 vout_SynchroDecode( p_sys->p_synchro );
248 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
252 if( p_block->i_flags & BLOCK_FLAG_PREROLL )
254 p_sys->b_preroll = VLC_TRUE;
256 else if( p_sys->b_preroll )
258 p_sys->b_preroll = VLC_FALSE;
260 vout_SynchroReset( p_sys->p_synchro );
266 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
268 #else /* New interface */
269 if( p_block->i_pts || p_block->i_dts )
271 mpeg2_tag_picture( p_sys->p_mpeg2dec,
272 (uint32_t)p_block->i_pts,
273 (uint32_t)p_block->i_dts );
275 p_sys->i_previous_pts = p_sys->i_current_pts;
276 p_sys->i_current_pts = p_block->i_pts;
277 p_sys->i_previous_dts = p_sys->i_current_dts;
278 p_sys->i_current_dts = p_block->i_dts;
281 p_sys->i_current_rate = p_block->i_rate;
283 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
284 p_block->p_buffer + p_block->i_buffer );
286 p_block->i_buffer = 0;
291 /* Initialize video output */
293 buf[0] = buf[1] = buf[2] = NULL;
295 /* Check whether the input gave a particular aspect ratio */
296 if( p_dec->fmt_in.video.i_aspect )
298 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
299 if( p_sys->i_aspect <= AR_221_1_PICTURE )
300 switch( p_sys->i_aspect )
303 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
305 case AR_16_9_PICTURE:
306 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
308 case AR_221_1_PICTURE:
309 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
311 case AR_SQUARE_PICTURE:
312 p_sys->i_aspect = VOUT_ASPECT_FACTOR *
313 p_sys->p_info->sequence->width /
314 p_sys->p_info->sequence->height;
320 /* Use the value provided in the MPEG sequence header */
321 if( p_sys->p_info->sequence->pixel_height > 0 )
324 ((uint64_t)p_sys->p_info->sequence->display_width) *
325 p_sys->p_info->sequence->pixel_width *
327 p_sys->p_info->sequence->display_height /
328 p_sys->p_info->sequence->pixel_height;
332 /* Invalid aspect, assume 4:3.
333 * This shouldn't happen and if it does it is a bug
334 * in libmpeg2 (likely triggered by an invalid stream) */
335 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
339 msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
340 p_sys->p_info->sequence->width,
341 p_sys->p_info->sequence->height, p_sys->i_aspect,
342 (uint32_t)((uint64_t)1001000000 * 27 /
343 p_sys->p_info->sequence->frame_period / 1001),
344 (uint32_t)((uint64_t)1001000000 * 27 /
345 p_sys->p_info->sequence->frame_period % 1001) );
347 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
349 /* Set the first 2 reference frames */
350 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
352 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
354 block_Release( p_block );
358 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
360 /* This picture will never go through display_picture. */
363 /* For some reason, libmpeg2 will put this pic twice in
364 * discard_picture. This can be considered a bug in libmpeg2. */
365 p_dec->pf_picture_link( p_dec, p_pic );
367 if( p_sys->p_synchro )
369 vout_SynchroRelease( p_sys->p_synchro );
371 p_sys->p_synchro = vout_SynchroInit( p_dec,
372 (uint32_t)((uint64_t)1001000000 * 27 /
373 p_sys->p_info->sequence->frame_period) );
374 p_sys->b_after_sequence_header = 1;
378 case STATE_PICTURE_2ND:
379 vout_SynchroNewPicture( p_sys->p_synchro,
380 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
381 p_sys->p_info->current_picture->nb_fields,
382 0, 0, p_sys->i_current_rate,
383 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
387 vout_SynchroTrash( p_sys->p_synchro );
391 vout_SynchroDecode( p_sys->p_synchro );
398 mtime_t i_pts, i_dts;
399 buf[0] = buf[1] = buf[2] = NULL;
401 if ( p_sys->b_after_sequence_header &&
402 ((p_sys->p_info->current_picture->flags &
403 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
405 /* Intra-slice refresh. Simulate a blank I picture. */
406 msg_Dbg( p_dec, "intra-slice refresh stream" );
407 vout_SynchroNewPicture( p_sys->p_synchro,
408 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
409 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
410 vout_SynchroDecode( p_sys->p_synchro );
411 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
412 p_sys->b_slice_i = 1;
414 p_sys->b_after_sequence_header = 0;
417 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
418 ( ( p_sys->p_info->current_picture->pts ==
419 (uint32_t)p_sys->i_current_pts ) ?
420 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
423 /* Hack to handle demuxers which only have DTS timestamps */
424 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
426 if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
427 (p_sys->p_info->current_picture->flags &
428 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
430 i_pts = p_block->i_dts;
433 p_block->i_pts = p_block->i_dts = 0;
436 #else /* New interface */
438 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
439 ( ( p_sys->p_info->current_picture->tag ==
440 (uint32_t)p_sys->i_current_pts ) ?
441 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
442 i_dts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
443 ( ( p_sys->p_info->current_picture->tag2 ==
444 (uint32_t)p_sys->i_current_dts ) ?
445 p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
448 vout_SynchroNewPicture( p_sys->p_synchro,
449 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
450 p_sys->p_info->current_picture->nb_fields, i_pts, i_dts,
451 p_sys->i_current_rate,
452 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
454 if( !p_dec->b_pace_control && !p_sys->b_preroll &&
456 && ((p_sys->p_info->current_picture->flags
457 & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
458 && !vout_SynchroChoose( p_sys->p_synchro,
459 p_sys->p_info->current_picture->flags
460 & PIC_MASK_CODING_TYPE,
461 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
462 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
464 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
466 vout_SynchroTrash( p_sys->p_synchro );
467 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
471 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
473 vout_SynchroDecode( p_sys->p_synchro );
475 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
477 block_Release( p_block );
481 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
489 if( p_sys->p_info->display_fbuf
490 && p_sys->p_info->display_fbuf->id )
492 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
494 vout_SynchroEnd( p_sys->p_synchro,
495 p_sys->p_info->display_picture->flags
496 & PIC_MASK_CODING_TYPE,
497 p_sys->b_garbage_pic );
498 p_sys->b_garbage_pic = 0;
500 if ( p_sys->p_picture_to_destroy != p_pic )
502 p_pic->date = vout_SynchroDate( p_sys->p_synchro );
506 p_sys->p_picture_to_destroy = NULL;
511 if( p_sys->p_info->discard_fbuf &&
512 p_sys->p_info->discard_fbuf->id )
514 p_dec->pf_picture_unlink( p_dec,
515 p_sys->p_info->discard_fbuf->id );
518 /* For still frames */
519 if( state == STATE_END && p_pic ) p_pic->b_force = VLC_TRUE;
523 /* Avoid frames with identical timestamps.
524 * Especially needed for still frames in DVD menus. */
525 if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
526 p_sys->i_last_frame_pts = p_pic->date;
536 buf[0] = buf[1] = buf[2] = NULL;
538 msg_Warn( p_dec, "invalid picture encountered" );
539 if ( ( p_sys->p_info->current_picture == NULL ) ||
540 ( ( p_sys->p_info->current_picture->flags &
541 PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
543 if( p_sys->p_synchro ) vout_SynchroReset( p_sys->p_synchro );
545 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
548 if( p_sys->p_info->current_fbuf &&
549 p_sys->p_info->current_fbuf->id )
551 p_sys->b_garbage_pic = 1;
552 p_pic = p_sys->p_info->current_fbuf->id;
554 else if( !p_sys->p_info->sequence )
560 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
562 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
564 p_sys->p_picture_to_destroy = p_pic;
566 memset( p_pic->p[0].p_pixels, 0,
567 p_sys->p_info->sequence->width
568 * p_sys->p_info->sequence->height );
569 memset( p_pic->p[1].p_pixels, 0x80,
570 p_sys->p_info->sequence->width
571 * p_sys->p_info->sequence->height / 4 );
572 memset( p_pic->p[2].p_pixels, 0x80,
573 p_sys->p_info->sequence->width
574 * p_sys->p_info->sequence->height / 4 );
576 if( p_sys->b_slice_i )
578 vout_SynchroNewPicture( p_sys->p_synchro,
579 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
580 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
581 vout_SynchroDecode( p_sys->p_synchro );
582 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
596 /*****************************************************************************
597 * CloseDecoder: libmpeg2 decoder destruction
598 *****************************************************************************/
599 static void CloseDecoder( vlc_object_t *p_this )
601 decoder_t *p_dec = (decoder_t *)p_this;
602 decoder_sys_t *p_sys = p_dec->p_sys;
604 if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
606 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
611 /*****************************************************************************
612 * GetNewPicture: Get a new picture from the vout and set the buf struct
613 *****************************************************************************/
614 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
616 decoder_sys_t *p_sys = p_dec->p_sys;
619 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
620 p_dec->fmt_out.video.i_visible_width =
621 p_sys->p_info->sequence->picture_width;
622 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
623 p_dec->fmt_out.video.i_visible_height =
624 p_sys->p_info->sequence->picture_height;
625 p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
627 if( p_sys->p_info->sequence->frame_period > 0 )
629 p_dec->fmt_out.video.i_frame_rate =
630 (uint32_t)( (uint64_t)1001000000 * 27 /
631 p_sys->p_info->sequence->frame_period );
632 p_dec->fmt_out.video.i_frame_rate_base = 1001;
635 p_dec->fmt_out.i_codec =
636 ( p_sys->p_info->sequence->chroma_height <
637 p_sys->p_info->sequence->height ) ?
638 VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
640 /* Get a new picture */
641 p_pic = p_dec->pf_vout_buffer_new( p_dec );
643 if( p_pic == NULL ) return NULL;
645 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
646 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
647 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
648 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
649 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
650 p_sys->p_info->current_picture->nb_fields : 2;
652 p_dec->pf_picture_link( p_dec, p_pic );
654 pp_buf[0] = p_pic->p[0].p_pixels;
655 pp_buf[1] = p_pic->p[1].p_pixels;
656 pp_buf[2] = p_pic->p[2].p_pixels;