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_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 */
73 vout_synchro_t *p_synchro;
77 mtime_t i_last_frame_pts;
81 /*****************************************************************************
83 *****************************************************************************/
84 static int OpenDecoder( vlc_object_t * );
85 static void CloseDecoder( vlc_object_t * );
87 static picture_t *DecodeBlock( decoder_t *, block_t ** );
89 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
90 static void GetAR( decoder_t *p_dec );
92 /*****************************************************************************
94 *****************************************************************************/
96 set_description( _("MPEG I/II video decoder (using libmpeg2)") );
97 set_capability( "decoder", 150 );
98 set_category( CAT_INPUT );
99 set_subcategory( SUBCAT_INPUT_VCODEC );
100 set_callbacks( OpenDecoder, CloseDecoder );
101 add_shortcut( "libmpeg2" );
104 /*****************************************************************************
105 * OpenDecoder: probe the decoder and return score
106 *****************************************************************************/
107 static int OpenDecoder( vlc_object_t *p_this )
109 decoder_t *p_dec = (decoder_t*)p_this;
110 decoder_sys_t *p_sys;
111 uint32_t i_accel = 0;
113 if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','v') &&
114 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
115 /* Pinnacle hardware-mpeg1 */
116 p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
118 p_dec->fmt_in.i_codec != VLC_FOURCC('V','C','R','2') &&
119 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') &&
120 p_dec->fmt_in.i_codec != VLC_FOURCC('h','d','v','2') )
125 /* Allocate the memory needed to store the decoder's structure */
126 if( ( p_dec->p_sys = p_sys =
127 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
129 msg_Err( p_dec, "out of memory" );
133 /* Initialize the thread properties */
134 memset( p_sys, 0, sizeof(decoder_sys_t) );
135 p_sys->p_mpeg2dec = NULL;
136 p_sys->p_synchro = NULL;
137 p_sys->p_info = NULL;
138 p_sys->i_current_pts = 0;
139 p_sys->i_previous_pts = 0;
140 p_sys->i_current_dts = 0;
141 p_sys->i_previous_dts = 0;
142 p_sys->p_picture_to_destroy = NULL;
143 p_sys->b_garbage_pic = 0;
144 p_sys->b_slice_i = 0;
146 p_sys->b_preroll = VLC_FALSE;
148 #if defined( __i386__ ) || defined( __x86_64__ )
149 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMX )
151 i_accel |= MPEG2_ACCEL_X86_MMX;
154 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_3DNOW )
156 i_accel |= MPEG2_ACCEL_X86_3DNOW;
159 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMXEXT )
161 i_accel |= MPEG2_ACCEL_X86_MMXEXT;
164 #elif defined( __powerpc__ ) || defined( SYS_DARWIN )
165 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_ALTIVEC )
167 i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
171 /* If we do not know this CPU, trust libmpeg2's feature detection */
172 i_accel = MPEG2_ACCEL_DETECT;
176 /* Set CPU acceleration features */
177 mpeg2_accel( i_accel );
179 /* Initialize decoder */
180 p_sys->p_mpeg2dec = mpeg2_init();
181 if( p_sys->p_mpeg2dec == NULL)
183 msg_Err( p_dec, "mpeg2_init() failed" );
188 p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
190 p_dec->pf_decode_video = DecodeBlock;
195 /*****************************************************************************
196 * RunDecoder: the libmpeg2 decoder
197 *****************************************************************************/
198 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
200 decoder_sys_t *p_sys = p_dec->p_sys;
206 if( !pp_block || !*pp_block ) return NULL;
212 state = mpeg2_parse( p_sys->p_mpeg2dec );
217 if( !p_block->i_buffer )
219 block_Release( p_block );
223 if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
224 | BLOCK_FLAG_CORRUPTED)) &&
226 p_sys->p_info->sequence &&
227 p_sys->p_info->sequence->width != (unsigned)-1 )
229 vout_SynchroReset( p_sys->p_synchro );
230 if( p_sys->p_info->current_fbuf != NULL
231 && p_sys->p_info->current_fbuf->id != NULL )
233 p_sys->b_garbage_pic = 1;
234 p_pic = p_sys->p_info->current_fbuf->id;
239 buf[0] = buf[1] = buf[2] = NULL;
240 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
242 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
244 p_sys->p_picture_to_destroy = p_pic;
246 if ( p_sys->b_slice_i )
248 vout_SynchroNewPicture( p_sys->p_synchro,
249 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
250 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
251 vout_SynchroDecode( p_sys->p_synchro );
252 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
256 if( p_block->i_flags & BLOCK_FLAG_PREROLL )
258 p_sys->b_preroll = VLC_TRUE;
260 else if( p_sys->b_preroll )
262 p_sys->b_preroll = VLC_FALSE;
264 vout_SynchroReset( p_sys->p_synchro );
270 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
272 #else /* New interface */
273 if( p_block->i_pts || p_block->i_dts )
275 mpeg2_tag_picture( p_sys->p_mpeg2dec,
276 (uint32_t)p_block->i_pts,
277 (uint32_t)p_block->i_dts );
279 p_sys->i_previous_pts = p_sys->i_current_pts;
280 p_sys->i_current_pts = p_block->i_pts;
281 p_sys->i_previous_dts = p_sys->i_current_dts;
282 p_sys->i_current_dts = p_block->i_dts;
285 p_sys->i_current_rate = p_block->i_rate;
287 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
288 p_block->p_buffer + p_block->i_buffer );
290 p_block->i_buffer = 0;
293 #ifdef STATE_SEQUENCE_MODIFIED
294 case STATE_SEQUENCE_MODIFIED:
301 /* Initialize video output */
303 buf[0] = buf[1] = buf[2] = NULL;
307 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
309 /* Set the first 2 reference frames */
310 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
312 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
314 block_Release( p_block );
318 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
320 /* This picture will never go through display_picture. */
323 /* For some reason, libmpeg2 will put this pic twice in
324 * discard_picture. This can be considered a bug in libmpeg2. */
325 p_dec->pf_picture_link( p_dec, p_pic );
327 if( p_sys->p_synchro )
329 vout_SynchroRelease( p_sys->p_synchro );
331 p_sys->p_synchro = vout_SynchroInit( p_dec,
332 (uint32_t)((uint64_t)1001000000 * 27 /
333 p_sys->p_info->sequence->frame_period) );
334 p_sys->b_after_sequence_header = 1;
338 case STATE_PICTURE_2ND:
339 vout_SynchroNewPicture( p_sys->p_synchro,
340 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
341 p_sys->p_info->current_picture->nb_fields,
342 0, 0, p_sys->i_current_rate,
343 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
347 vout_SynchroTrash( p_sys->p_synchro );
351 vout_SynchroDecode( p_sys->p_synchro );
358 mtime_t i_pts, i_dts;
359 buf[0] = buf[1] = buf[2] = NULL;
361 if ( p_sys->b_after_sequence_header &&
362 ((p_sys->p_info->current_picture->flags &
363 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
365 /* Intra-slice refresh. Simulate a blank I picture. */
366 msg_Dbg( p_dec, "intra-slice refresh stream" );
367 vout_SynchroNewPicture( p_sys->p_synchro,
368 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
369 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
370 vout_SynchroDecode( p_sys->p_synchro );
371 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
372 p_sys->b_slice_i = 1;
374 p_sys->b_after_sequence_header = 0;
377 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
378 ( ( p_sys->p_info->current_picture->pts ==
379 (uint32_t)p_sys->i_current_pts ) ?
380 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
383 /* Hack to handle demuxers which only have DTS timestamps */
384 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
386 if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
387 (p_sys->p_info->current_picture->flags &
388 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
390 i_pts = p_block->i_dts;
393 p_block->i_pts = p_block->i_dts = 0;
396 #else /* New interface */
398 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
399 ( ( p_sys->p_info->current_picture->tag ==
400 (uint32_t)p_sys->i_current_pts ) ?
401 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
402 i_dts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
403 ( ( p_sys->p_info->current_picture->tag2 ==
404 (uint32_t)p_sys->i_current_dts ) ?
405 p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
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, i_pts, i_dts,
411 p_sys->i_current_rate,
412 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
414 if( !p_dec->b_pace_control && !p_sys->b_preroll &&
416 && ((p_sys->p_info->current_picture->flags
417 & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
418 && !vout_SynchroChoose( p_sys->p_synchro,
419 p_sys->p_info->current_picture->flags
420 & PIC_MASK_CODING_TYPE,
421 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
422 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
424 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
426 vout_SynchroTrash( p_sys->p_synchro );
427 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
431 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
433 vout_SynchroDecode( p_sys->p_synchro );
435 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
437 block_Release( p_block );
441 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
449 if( p_sys->p_info->display_fbuf
450 && p_sys->p_info->display_fbuf->id )
452 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
454 vout_SynchroEnd( p_sys->p_synchro,
455 p_sys->p_info->display_picture->flags
456 & PIC_MASK_CODING_TYPE,
457 p_sys->b_garbage_pic );
458 p_sys->b_garbage_pic = 0;
460 if ( p_sys->p_picture_to_destroy != p_pic )
462 p_pic->date = vout_SynchroDate( p_sys->p_synchro );
466 p_sys->p_picture_to_destroy = NULL;
471 if( p_sys->p_info->discard_fbuf &&
472 p_sys->p_info->discard_fbuf->id )
474 p_dec->pf_picture_unlink( p_dec,
475 p_sys->p_info->discard_fbuf->id );
478 /* For still frames */
479 if( state == STATE_END && p_pic ) p_pic->b_force = VLC_TRUE;
483 /* Avoid frames with identical timestamps.
484 * Especially needed for still frames in DVD menus. */
485 if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
486 p_sys->i_last_frame_pts = p_pic->date;
496 buf[0] = buf[1] = buf[2] = NULL;
498 msg_Warn( p_dec, "invalid picture encountered" );
499 if ( ( p_sys->p_info->current_picture == NULL ) ||
500 ( ( p_sys->p_info->current_picture->flags &
501 PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
503 if( p_sys->p_synchro ) vout_SynchroReset( p_sys->p_synchro );
505 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
508 if( p_sys->p_info->current_fbuf &&
509 p_sys->p_info->current_fbuf->id )
511 p_sys->b_garbage_pic = 1;
512 p_pic = p_sys->p_info->current_fbuf->id;
514 else if( !p_sys->p_info->sequence )
520 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
522 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
524 p_sys->p_picture_to_destroy = p_pic;
526 memset( p_pic->p[0].p_pixels, 0,
527 p_sys->p_info->sequence->width
528 * p_sys->p_info->sequence->height );
529 memset( p_pic->p[1].p_pixels, 0x80,
530 p_sys->p_info->sequence->width
531 * p_sys->p_info->sequence->height / 4 );
532 memset( p_pic->p[2].p_pixels, 0x80,
533 p_sys->p_info->sequence->width
534 * p_sys->p_info->sequence->height / 4 );
536 if( p_sys->b_slice_i )
538 vout_SynchroNewPicture( p_sys->p_synchro,
539 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
540 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
541 vout_SynchroDecode( p_sys->p_synchro );
542 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
556 /*****************************************************************************
557 * CloseDecoder: libmpeg2 decoder destruction
558 *****************************************************************************/
559 static void CloseDecoder( vlc_object_t *p_this )
561 decoder_t *p_dec = (decoder_t *)p_this;
562 decoder_sys_t *p_sys = p_dec->p_sys;
564 if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
566 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
571 /*****************************************************************************
572 * GetNewPicture: Get a new picture from the vout and set the buf struct
573 *****************************************************************************/
574 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
576 decoder_sys_t *p_sys = p_dec->p_sys;
579 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
580 p_dec->fmt_out.video.i_visible_width =
581 p_sys->p_info->sequence->picture_width;
582 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
583 p_dec->fmt_out.video.i_visible_height =
584 p_sys->p_info->sequence->picture_height;
585 p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
586 p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
587 p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
589 if( p_sys->p_info->sequence->frame_period > 0 )
591 p_dec->fmt_out.video.i_frame_rate =
592 (uint32_t)( (uint64_t)1001000000 * 27 /
593 p_sys->p_info->sequence->frame_period );
594 p_dec->fmt_out.video.i_frame_rate_base = 1001;
597 p_dec->fmt_out.i_codec =
598 ( p_sys->p_info->sequence->chroma_height <
599 p_sys->p_info->sequence->height ) ?
600 VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
602 /* Get a new picture */
603 p_pic = p_dec->pf_vout_buffer_new( p_dec );
605 if( p_pic == NULL ) return NULL;
607 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
608 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
609 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
610 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
611 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
612 p_sys->p_info->current_picture->nb_fields : 2;
614 p_dec->pf_picture_link( p_dec, p_pic );
616 pp_buf[0] = p_pic->p[0].p_pixels;
617 pp_buf[1] = p_pic->p[1].p_pixels;
618 pp_buf[2] = p_pic->p[2].p_pixels;
623 /*****************************************************************************
624 * GetAR: Get aspect ratio
625 *****************************************************************************/
626 static void GetAR( decoder_t *p_dec )
628 decoder_sys_t *p_sys = p_dec->p_sys;
630 /* Check whether the input gave a particular aspect ratio */
631 if( p_dec->fmt_in.video.i_aspect )
633 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
634 if( p_sys->i_aspect <= AR_221_1_PICTURE )
635 switch( p_sys->i_aspect )
638 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
639 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
640 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
642 case AR_16_9_PICTURE:
643 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
644 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 16;
645 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 9;
647 case AR_221_1_PICTURE:
648 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
649 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 221;
650 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 100;
652 case AR_SQUARE_PICTURE:
653 p_sys->i_aspect = VOUT_ASPECT_FACTOR *
654 p_sys->p_info->sequence->picture_width /
655 p_sys->p_info->sequence->picture_height;
656 p_sys->i_sar_num = p_sys->i_sar_den = 1;
662 /* Use the value provided in the MPEG sequence header */
663 if( p_sys->p_info->sequence->pixel_height > 0 )
666 ((uint64_t)p_sys->p_info->sequence->picture_width) *
667 p_sys->p_info->sequence->pixel_width *
669 p_sys->p_info->sequence->picture_height /
670 p_sys->p_info->sequence->pixel_height;
671 p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
672 p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
676 /* Invalid aspect, assume 4:3.
677 * This shouldn't happen and if it does it is a bug
678 * in libmpeg2 (likely triggered by an invalid stream) */
679 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
680 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
681 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
685 msg_Dbg( p_dec, "%dx%d (display %d,%d), aspect %d, sar %i:%i, %u.%03u fps",
686 p_sys->p_info->sequence->picture_width,
687 p_sys->p_info->sequence->picture_height,
688 p_sys->p_info->sequence->display_width,
689 p_sys->p_info->sequence->display_height,
690 p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
691 (uint32_t)((uint64_t)1001000000 * 27 /
692 p_sys->p_info->sequence->frame_period / 1001),
693 (uint32_t)((uint64_t)1001000000 * 27 /
694 p_sys->p_info->sequence->frame_period % 1001) );