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|BLOCK_FLAG_CORRUPTED)) &&
221 p_sys->p_info->sequence &&
222 p_sys->p_info->sequence->width != (unsigned)-1 )
224 vout_SynchroReset( p_sys->p_synchro );
225 if( p_sys->p_info->current_fbuf != NULL
226 && p_sys->p_info->current_fbuf->id != NULL )
228 p_sys->b_garbage_pic = 1;
229 p_pic = p_sys->p_info->current_fbuf->id;
234 buf[0] = buf[1] = buf[2] = NULL;
235 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
237 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
239 p_sys->p_picture_to_destroy = p_pic;
241 if ( p_sys->b_slice_i )
243 vout_SynchroNewPicture( p_sys->p_synchro,
244 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
245 vout_SynchroDecode( p_sys->p_synchro );
246 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
250 if( p_block->i_flags & BLOCK_FLAG_PREROLL )
252 p_sys->b_preroll = VLC_TRUE;
254 else if( p_sys->b_preroll )
256 p_sys->b_preroll = VLC_FALSE;
258 vout_SynchroReset( p_sys->p_synchro );
264 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
266 #else /* New interface */
267 if( p_block->i_pts || p_block->i_dts )
269 mpeg2_tag_picture( p_sys->p_mpeg2dec,
270 (uint32_t)p_block->i_pts,
271 (uint32_t)p_block->i_dts );
273 p_sys->i_previous_pts = p_sys->i_current_pts;
274 p_sys->i_current_pts = p_block->i_pts;
275 p_sys->i_previous_dts = p_sys->i_current_dts;
276 p_sys->i_current_dts = p_block->i_dts;
279 p_sys->i_current_rate = p_block->i_rate;
281 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
282 p_block->p_buffer + p_block->i_buffer );
284 p_block->i_buffer = 0;
289 /* Initialize video output */
291 buf[0] = buf[1] = buf[2] = NULL;
293 /* Check whether the input gave a particular aspect ratio */
294 if( p_dec->fmt_in.video.i_aspect )
296 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
297 if( p_sys->i_aspect <= AR_221_1_PICTURE )
298 switch( p_sys->i_aspect )
301 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
303 case AR_16_9_PICTURE:
304 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
306 case AR_221_1_PICTURE:
307 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
309 case AR_SQUARE_PICTURE:
310 p_sys->i_aspect = VOUT_ASPECT_FACTOR *
311 p_sys->p_info->sequence->width /
312 p_sys->p_info->sequence->height;
318 /* Use the value provided in the MPEG sequence header */
319 if( p_sys->p_info->sequence->pixel_height > 0 )
322 ((uint64_t)p_sys->p_info->sequence->display_width) *
323 p_sys->p_info->sequence->pixel_width *
325 p_sys->p_info->sequence->display_height /
326 p_sys->p_info->sequence->pixel_height;
330 /* Invalid aspect, assume 4:3.
331 * This shouldn't happen and if it does it is a bug
332 * in libmpeg2 (likely triggered by an invalid stream) */
333 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
337 msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
338 p_sys->p_info->sequence->width,
339 p_sys->p_info->sequence->height, p_sys->i_aspect,
340 (uint32_t)((uint64_t)1001000000 * 27 /
341 p_sys->p_info->sequence->frame_period / 1001),
342 (uint32_t)((uint64_t)1001000000 * 27 /
343 p_sys->p_info->sequence->frame_period % 1001) );
345 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
347 /* Set the first 2 reference frames */
348 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
350 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
352 block_Release( p_block );
356 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
358 /* This picture will never go through display_picture. */
361 /* For some reason, libmpeg2 will put this pic twice in
362 * discard_picture. This can be considered a bug in libmpeg2. */
363 p_dec->pf_picture_link( p_dec, p_pic );
365 if( p_sys->p_synchro )
367 vout_SynchroRelease( p_sys->p_synchro );
369 p_sys->p_synchro = vout_SynchroInit( p_dec,
370 (uint32_t)((uint64_t)1001000000 * 27 /
371 p_sys->p_info->sequence->frame_period) );
372 p_sys->b_after_sequence_header = 1;
376 case STATE_PICTURE_2ND:
377 vout_SynchroNewPicture( p_sys->p_synchro,
378 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
379 p_sys->p_info->current_picture->nb_fields,
380 0, 0, p_sys->i_current_rate );
384 vout_SynchroTrash( p_sys->p_synchro );
388 vout_SynchroDecode( p_sys->p_synchro );
395 mtime_t i_pts, i_dts;
396 buf[0] = buf[1] = buf[2] = NULL;
398 if ( p_sys->b_after_sequence_header &&
399 ((p_sys->p_info->current_picture->flags &
400 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
402 /* Intra-slice refresh. Simulate a blank I picture. */
403 msg_Dbg( p_dec, "intra-slice refresh stream" );
404 vout_SynchroNewPicture( p_sys->p_synchro,
405 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
406 vout_SynchroDecode( p_sys->p_synchro );
407 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
408 p_sys->b_slice_i = 1;
410 p_sys->b_after_sequence_header = 0;
413 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
414 ( ( p_sys->p_info->current_picture->pts ==
415 (uint32_t)p_sys->i_current_pts ) ?
416 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
419 /* Hack to handle demuxers which only have DTS timestamps */
420 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
422 if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
423 (p_sys->p_info->current_picture->flags &
424 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
426 i_pts = p_block->i_dts;
429 p_block->i_pts = p_block->i_dts = 0;
432 #else /* New interface */
434 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
435 ( ( p_sys->p_info->current_picture->tag ==
436 (uint32_t)p_sys->i_current_pts ) ?
437 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
438 i_dts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
439 ( ( p_sys->p_info->current_picture->tag2 ==
440 (uint32_t)p_sys->i_current_dts ) ?
441 p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
444 vout_SynchroNewPicture( p_sys->p_synchro,
445 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
446 p_sys->p_info->current_picture->nb_fields, i_pts, i_dts,
447 p_sys->i_current_rate );
449 if( !p_dec->b_pace_control && !p_sys->b_preroll &&
451 && ((p_sys->p_info->current_picture->flags
452 & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
453 && !vout_SynchroChoose( p_sys->p_synchro,
454 p_sys->p_info->current_picture->flags
455 & PIC_MASK_CODING_TYPE,
456 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/ ) )
458 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
460 vout_SynchroTrash( p_sys->p_synchro );
461 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
465 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
467 vout_SynchroDecode( p_sys->p_synchro );
469 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
471 block_Release( p_block );
475 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
483 if( p_sys->p_info->display_fbuf
484 && p_sys->p_info->display_fbuf->id )
486 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
488 vout_SynchroEnd( p_sys->p_synchro,
489 p_sys->p_info->display_picture->flags
490 & PIC_MASK_CODING_TYPE,
491 p_sys->b_garbage_pic );
492 p_sys->b_garbage_pic = 0;
494 if ( p_sys->p_picture_to_destroy != p_pic )
496 p_pic->date = vout_SynchroDate( p_sys->p_synchro );
500 p_sys->p_picture_to_destroy = NULL;
505 if( p_sys->p_info->discard_fbuf &&
506 p_sys->p_info->discard_fbuf->id )
508 p_dec->pf_picture_unlink( p_dec,
509 p_sys->p_info->discard_fbuf->id );
512 /* For still frames */
513 if( state == STATE_END && p_pic ) p_pic->b_force = VLC_TRUE;
517 /* Avoid frames with identical timestamps.
518 * Especially needed for still frames in DVD menus. */
519 if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
520 p_sys->i_last_frame_pts = p_pic->date;
530 buf[0] = buf[1] = buf[2] = NULL;
532 msg_Warn( p_dec, "invalid picture encountered" );
533 if ( ( p_sys->p_info->current_picture == NULL ) ||
534 ( ( p_sys->p_info->current_picture->flags &
535 PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
537 if( p_sys->p_synchro ) vout_SynchroReset( p_sys->p_synchro );
539 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
542 if( p_sys->p_info->current_fbuf &&
543 p_sys->p_info->current_fbuf->id )
545 p_sys->b_garbage_pic = 1;
546 p_pic = p_sys->p_info->current_fbuf->id;
548 else if( !p_sys->p_info->sequence )
554 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
556 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
558 p_sys->p_picture_to_destroy = p_pic;
560 memset( p_pic->p[0].p_pixels, 0,
561 p_sys->p_info->sequence->width
562 * p_sys->p_info->sequence->height );
563 memset( p_pic->p[1].p_pixels, 0x80,
564 p_sys->p_info->sequence->width
565 * p_sys->p_info->sequence->height / 4 );
566 memset( p_pic->p[2].p_pixels, 0x80,
567 p_sys->p_info->sequence->width
568 * p_sys->p_info->sequence->height / 4 );
570 if( p_sys->b_slice_i )
572 vout_SynchroNewPicture( p_sys->p_synchro,
573 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
574 vout_SynchroDecode( p_sys->p_synchro );
575 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
589 /*****************************************************************************
590 * CloseDecoder: libmpeg2 decoder destruction
591 *****************************************************************************/
592 static void CloseDecoder( vlc_object_t *p_this )
594 decoder_t *p_dec = (decoder_t *)p_this;
595 decoder_sys_t *p_sys = p_dec->p_sys;
597 if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
599 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
604 /*****************************************************************************
605 * GetNewPicture: Get a new picture from the vout and set the buf struct
606 *****************************************************************************/
607 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
609 decoder_sys_t *p_sys = p_dec->p_sys;
612 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
613 p_dec->fmt_out.video.i_visible_width =
614 p_sys->p_info->sequence->picture_width;
615 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
616 p_dec->fmt_out.video.i_visible_height =
617 p_sys->p_info->sequence->picture_height;
618 p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
620 if( p_sys->p_info->sequence->frame_period > 0 )
622 p_dec->fmt_out.video.i_frame_rate =
623 (uint32_t)( (uint64_t)1001000000 * 27 /
624 p_sys->p_info->sequence->frame_period );
625 p_dec->fmt_out.video.i_frame_rate_base = 1001;
628 p_dec->fmt_out.i_codec =
629 ( p_sys->p_info->sequence->chroma_height <
630 p_sys->p_info->sequence->height ) ?
631 VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
633 /* Get a new picture */
634 p_pic = p_dec->pf_vout_buffer_new( p_dec );
636 if( p_pic == NULL ) return NULL;
638 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
639 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
640 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
641 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
642 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
643 p_sys->p_info->current_picture->nb_fields : 2;
645 p_dec->pf_picture_link( p_dec, p_pic );
647 pp_buf[0] = p_pic->p[0].p_pixels;
648 pp_buf[1] = p_pic->p[1].p_pixels;
649 pp_buf[2] = p_pic->p[2].p_pixels;