1 /*****************************************************************************
2 * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
3 *****************************************************************************
4 * Copyright (C) 1999-2001 VideoLAN (Centrale Réseaux) and its contributors
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') )
122 /* Allocate the memory needed to store the decoder's structure */
123 if( ( p_dec->p_sys = p_sys =
124 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
126 msg_Err( p_dec, "out of memory" );
130 /* Initialize the thread properties */
131 memset( p_sys, 0, sizeof(decoder_sys_t) );
132 p_sys->p_mpeg2dec = NULL;
133 p_sys->p_synchro = NULL;
134 p_sys->p_info = NULL;
135 p_sys->i_current_pts = 0;
136 p_sys->i_previous_pts = 0;
137 p_sys->i_current_dts = 0;
138 p_sys->i_previous_dts = 0;
139 p_sys->p_picture_to_destroy = NULL;
140 p_sys->b_garbage_pic = 0;
141 p_sys->b_slice_i = 0;
143 p_sys->b_preroll = VLC_FALSE;
145 #if defined( __i386__ ) || defined( __x86_64__ )
146 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMX )
148 i_accel |= MPEG2_ACCEL_X86_MMX;
151 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_3DNOW )
153 i_accel |= MPEG2_ACCEL_X86_3DNOW;
156 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMXEXT )
158 i_accel |= MPEG2_ACCEL_X86_MMXEXT;
161 #elif defined( __powerpc__ ) || defined( SYS_DARWIN )
162 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_ALTIVEC )
164 i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
168 /* If we do not know this CPU, trust libmpeg2's feature detection */
169 i_accel = MPEG2_ACCEL_DETECT;
173 /* Set CPU acceleration features */
174 mpeg2_accel( i_accel );
176 /* Initialize decoder */
177 p_sys->p_mpeg2dec = mpeg2_init();
178 if( p_sys->p_mpeg2dec == NULL)
180 msg_Err( p_dec, "mpeg2_init() failed" );
185 p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
187 p_dec->pf_decode_video = DecodeBlock;
192 /*****************************************************************************
193 * RunDecoder: the libmpeg2 decoder
194 *****************************************************************************/
195 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
197 decoder_sys_t *p_sys = p_dec->p_sys;
203 if( !pp_block || !*pp_block ) return NULL;
209 state = mpeg2_parse( p_sys->p_mpeg2dec );
214 if( !p_block->i_buffer )
216 block_Release( p_block );
220 if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
221 | BLOCK_FLAG_CORRUPTED)) &&
223 p_sys->p_info->sequence &&
224 p_sys->p_info->sequence->width != (unsigned)-1 )
226 vout_SynchroReset( p_sys->p_synchro );
227 if( p_sys->p_info->current_fbuf != NULL
228 && p_sys->p_info->current_fbuf->id != NULL )
230 p_sys->b_garbage_pic = 1;
231 p_pic = p_sys->p_info->current_fbuf->id;
236 buf[0] = buf[1] = buf[2] = NULL;
237 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
239 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
241 p_sys->p_picture_to_destroy = p_pic;
243 if ( p_sys->b_slice_i )
245 vout_SynchroNewPicture( p_sys->p_synchro,
246 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
247 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
248 vout_SynchroDecode( p_sys->p_synchro );
249 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
253 if( p_block->i_flags & BLOCK_FLAG_PREROLL )
255 p_sys->b_preroll = VLC_TRUE;
257 else if( p_sys->b_preroll )
259 p_sys->b_preroll = VLC_FALSE;
261 vout_SynchroReset( p_sys->p_synchro );
267 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
269 #else /* New interface */
270 if( p_block->i_pts || p_block->i_dts )
272 mpeg2_tag_picture( p_sys->p_mpeg2dec,
273 (uint32_t)p_block->i_pts,
274 (uint32_t)p_block->i_dts );
276 p_sys->i_previous_pts = p_sys->i_current_pts;
277 p_sys->i_current_pts = p_block->i_pts;
278 p_sys->i_previous_dts = p_sys->i_current_dts;
279 p_sys->i_current_dts = p_block->i_dts;
282 p_sys->i_current_rate = p_block->i_rate;
284 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
285 p_block->p_buffer + p_block->i_buffer );
287 p_block->i_buffer = 0;
290 #ifdef STATE_SEQUENCE_MODIFIED
291 case STATE_SEQUENCE_MODIFIED:
298 /* Initialize video output */
300 buf[0] = buf[1] = buf[2] = NULL;
304 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
306 /* Set the first 2 reference frames */
307 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
309 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
311 block_Release( p_block );
315 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
317 /* This picture will never go through display_picture. */
320 /* For some reason, libmpeg2 will put this pic twice in
321 * discard_picture. This can be considered a bug in libmpeg2. */
322 p_dec->pf_picture_link( p_dec, p_pic );
324 if( p_sys->p_synchro )
326 vout_SynchroRelease( p_sys->p_synchro );
328 p_sys->p_synchro = vout_SynchroInit( p_dec,
329 (uint32_t)((uint64_t)1001000000 * 27 /
330 p_sys->p_info->sequence->frame_period) );
331 p_sys->b_after_sequence_header = 1;
335 case STATE_PICTURE_2ND:
336 vout_SynchroNewPicture( p_sys->p_synchro,
337 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
338 p_sys->p_info->current_picture->nb_fields,
339 0, 0, p_sys->i_current_rate,
340 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
344 vout_SynchroTrash( p_sys->p_synchro );
348 vout_SynchroDecode( p_sys->p_synchro );
355 mtime_t i_pts, i_dts;
356 buf[0] = buf[1] = buf[2] = NULL;
358 if ( p_sys->b_after_sequence_header &&
359 ((p_sys->p_info->current_picture->flags &
360 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
362 /* Intra-slice refresh. Simulate a blank I picture. */
363 msg_Dbg( p_dec, "intra-slice refresh stream" );
364 vout_SynchroNewPicture( p_sys->p_synchro,
365 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
366 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
367 vout_SynchroDecode( p_sys->p_synchro );
368 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
369 p_sys->b_slice_i = 1;
371 p_sys->b_after_sequence_header = 0;
374 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
375 ( ( p_sys->p_info->current_picture->pts ==
376 (uint32_t)p_sys->i_current_pts ) ?
377 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
380 /* Hack to handle demuxers which only have DTS timestamps */
381 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
383 if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
384 (p_sys->p_info->current_picture->flags &
385 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
387 i_pts = p_block->i_dts;
390 p_block->i_pts = p_block->i_dts = 0;
393 #else /* New interface */
395 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
396 ( ( p_sys->p_info->current_picture->tag ==
397 (uint32_t)p_sys->i_current_pts ) ?
398 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
399 i_dts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
400 ( ( p_sys->p_info->current_picture->tag2 ==
401 (uint32_t)p_sys->i_current_dts ) ?
402 p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
405 vout_SynchroNewPicture( p_sys->p_synchro,
406 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
407 p_sys->p_info->current_picture->nb_fields, i_pts, i_dts,
408 p_sys->i_current_rate,
409 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
411 if( !p_dec->b_pace_control && !p_sys->b_preroll &&
413 && ((p_sys->p_info->current_picture->flags
414 & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
415 && !vout_SynchroChoose( p_sys->p_synchro,
416 p_sys->p_info->current_picture->flags
417 & PIC_MASK_CODING_TYPE,
418 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
419 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
421 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
423 vout_SynchroTrash( p_sys->p_synchro );
424 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
428 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
430 vout_SynchroDecode( p_sys->p_synchro );
432 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
434 block_Release( p_block );
438 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
446 if( p_sys->p_info->display_fbuf
447 && p_sys->p_info->display_fbuf->id )
449 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
451 vout_SynchroEnd( p_sys->p_synchro,
452 p_sys->p_info->display_picture->flags
453 & PIC_MASK_CODING_TYPE,
454 p_sys->b_garbage_pic );
455 p_sys->b_garbage_pic = 0;
457 if ( p_sys->p_picture_to_destroy != p_pic )
459 p_pic->date = vout_SynchroDate( p_sys->p_synchro );
463 p_sys->p_picture_to_destroy = NULL;
468 if( p_sys->p_info->discard_fbuf &&
469 p_sys->p_info->discard_fbuf->id )
471 p_dec->pf_picture_unlink( p_dec,
472 p_sys->p_info->discard_fbuf->id );
475 /* For still frames */
476 if( state == STATE_END && p_pic ) p_pic->b_force = VLC_TRUE;
480 /* Avoid frames with identical timestamps.
481 * Especially needed for still frames in DVD menus. */
482 if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
483 p_sys->i_last_frame_pts = p_pic->date;
493 buf[0] = buf[1] = buf[2] = NULL;
495 msg_Warn( p_dec, "invalid picture encountered" );
496 if ( ( p_sys->p_info->current_picture == NULL ) ||
497 ( ( p_sys->p_info->current_picture->flags &
498 PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
500 if( p_sys->p_synchro ) vout_SynchroReset( p_sys->p_synchro );
502 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
505 if( p_sys->p_info->current_fbuf &&
506 p_sys->p_info->current_fbuf->id )
508 p_sys->b_garbage_pic = 1;
509 p_pic = p_sys->p_info->current_fbuf->id;
511 else if( !p_sys->p_info->sequence )
517 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
519 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
521 p_sys->p_picture_to_destroy = p_pic;
523 memset( p_pic->p[0].p_pixels, 0,
524 p_sys->p_info->sequence->width
525 * p_sys->p_info->sequence->height );
526 memset( p_pic->p[1].p_pixels, 0x80,
527 p_sys->p_info->sequence->width
528 * p_sys->p_info->sequence->height / 4 );
529 memset( p_pic->p[2].p_pixels, 0x80,
530 p_sys->p_info->sequence->width
531 * p_sys->p_info->sequence->height / 4 );
533 if( p_sys->b_slice_i )
535 vout_SynchroNewPicture( p_sys->p_synchro,
536 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
537 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
538 vout_SynchroDecode( p_sys->p_synchro );
539 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
553 /*****************************************************************************
554 * CloseDecoder: libmpeg2 decoder destruction
555 *****************************************************************************/
556 static void CloseDecoder( vlc_object_t *p_this )
558 decoder_t *p_dec = (decoder_t *)p_this;
559 decoder_sys_t *p_sys = p_dec->p_sys;
561 if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
563 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
568 /*****************************************************************************
569 * GetNewPicture: Get a new picture from the vout and set the buf struct
570 *****************************************************************************/
571 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
573 decoder_sys_t *p_sys = p_dec->p_sys;
576 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
577 p_dec->fmt_out.video.i_visible_width =
578 p_sys->p_info->sequence->picture_width;
579 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
580 p_dec->fmt_out.video.i_visible_height =
581 p_sys->p_info->sequence->picture_height;
582 p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
584 if( p_sys->p_info->sequence->frame_period > 0 )
586 p_dec->fmt_out.video.i_frame_rate =
587 (uint32_t)( (uint64_t)1001000000 * 27 /
588 p_sys->p_info->sequence->frame_period );
589 p_dec->fmt_out.video.i_frame_rate_base = 1001;
592 p_dec->fmt_out.i_codec =
593 ( p_sys->p_info->sequence->chroma_height <
594 p_sys->p_info->sequence->height ) ?
595 VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
597 /* Get a new picture */
598 p_pic = p_dec->pf_vout_buffer_new( p_dec );
600 if( p_pic == NULL ) return NULL;
602 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
603 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
604 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
605 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
606 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
607 p_sys->p_info->current_picture->nb_fields : 2;
609 p_dec->pf_picture_link( p_dec, p_pic );
611 pp_buf[0] = p_pic->p[0].p_pixels;
612 pp_buf[1] = p_pic->p[1].p_pixels;
613 pp_buf[2] = p_pic->p[2].p_pixels;
618 /*****************************************************************************
619 * GetAR: Get aspect ratio
620 *****************************************************************************/
621 static void GetAR( decoder_t *p_dec )
623 decoder_sys_t *p_sys = p_dec->p_sys;
625 /* Check whether the input gave a particular aspect ratio */
626 if( p_dec->fmt_in.video.i_aspect )
628 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
629 if( p_sys->i_aspect <= AR_221_1_PICTURE )
630 switch( p_sys->i_aspect )
633 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
635 case AR_16_9_PICTURE:
636 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
638 case AR_221_1_PICTURE:
639 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
641 case AR_SQUARE_PICTURE:
642 p_sys->i_aspect = VOUT_ASPECT_FACTOR *
643 p_sys->p_info->sequence->width /
644 p_sys->p_info->sequence->height;
650 /* Use the value provided in the MPEG sequence header */
651 if( p_sys->p_info->sequence->pixel_height > 0 )
654 ((uint64_t)p_sys->p_info->sequence->display_width) *
655 p_sys->p_info->sequence->pixel_width *
657 p_sys->p_info->sequence->display_height /
658 p_sys->p_info->sequence->pixel_height;
662 /* Invalid aspect, assume 4:3.
663 * This shouldn't happen and if it does it is a bug
664 * in libmpeg2 (likely triggered by an invalid stream) */
665 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
669 msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
670 p_sys->p_info->sequence->width,
671 p_sys->p_info->sequence->height, p_sys->i_aspect,
672 (uint32_t)((uint64_t)1001000000 * 27 /
673 p_sys->p_info->sequence->frame_period / 1001),
674 (uint32_t)((uint64_t)1001000000 * 27 /
675 p_sys->p_info->sequence->frame_period % 1001) );