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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, 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_global->i_cpu & CPU_CAPABILITY_MMX )
151 i_accel |= MPEG2_ACCEL_X86_MMX;
154 if( p_dec->p_libvlc_global->i_cpu & CPU_CAPABILITY_3DNOW )
156 i_accel |= MPEG2_ACCEL_X86_3DNOW;
159 if( p_dec->p_libvlc_global->i_cpu & CPU_CAPABILITY_MMXEXT )
161 i_accel |= MPEG2_ACCEL_X86_MMXEXT;
164 #elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
165 if( p_dec->p_libvlc_global->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 );
243 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->format.i_width );
245 p_sys->p_picture_to_destroy = p_pic;
247 if ( p_sys->b_slice_i )
249 vout_SynchroNewPicture( p_sys->p_synchro,
250 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
251 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
252 vout_SynchroDecode( p_sys->p_synchro );
253 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
257 if( p_block->i_flags & BLOCK_FLAG_PREROLL )
259 p_sys->b_preroll = VLC_TRUE;
261 else if( p_sys->b_preroll )
263 p_sys->b_preroll = VLC_FALSE;
265 vout_SynchroReset( p_sys->p_synchro );
271 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
273 #else /* New interface */
274 if( p_block->i_pts || p_block->i_dts )
276 mpeg2_tag_picture( p_sys->p_mpeg2dec,
277 (uint32_t)p_block->i_pts,
278 (uint32_t)p_block->i_dts );
280 p_sys->i_previous_pts = p_sys->i_current_pts;
281 p_sys->i_current_pts = p_block->i_pts;
282 p_sys->i_previous_dts = p_sys->i_current_dts;
283 p_sys->i_current_dts = p_block->i_dts;
286 p_sys->i_current_rate = p_block->i_rate;
288 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
289 p_block->p_buffer + p_block->i_buffer );
291 p_block->i_buffer = 0;
294 #ifdef STATE_SEQUENCE_MODIFIED
295 case STATE_SEQUENCE_MODIFIED:
302 /* Initialize video output */
304 buf[0] = buf[1] = buf[2] = NULL;
308 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
310 /* Set the first 2 reference frames */
311 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
313 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
315 block_Release( p_block );
319 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
320 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->format.i_width );
322 /* This picture will never go through display_picture. */
325 /* For some reason, libmpeg2 will put this pic twice in
326 * discard_picture. This can be considered a bug in libmpeg2. */
327 p_dec->pf_picture_link( p_dec, p_pic );
329 if( p_sys->p_synchro )
331 vout_SynchroRelease( p_sys->p_synchro );
333 p_sys->p_synchro = vout_SynchroInit( p_dec,
334 (uint32_t)((uint64_t)1001000000 * 27 /
335 p_sys->p_info->sequence->frame_period) );
336 p_sys->b_after_sequence_header = 1;
340 case STATE_PICTURE_2ND:
341 vout_SynchroNewPicture( p_sys->p_synchro,
342 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
343 p_sys->p_info->current_picture->nb_fields,
344 0, 0, p_sys->i_current_rate,
345 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
349 vout_SynchroTrash( p_sys->p_synchro );
353 vout_SynchroDecode( p_sys->p_synchro );
360 mtime_t i_pts, i_dts;
361 buf[0] = buf[1] = buf[2] = NULL;
363 if ( p_sys->b_after_sequence_header &&
364 ((p_sys->p_info->current_picture->flags &
365 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
367 /* Intra-slice refresh. Simulate a blank I picture. */
368 msg_Dbg( p_dec, "intra-slice refresh stream" );
369 vout_SynchroNewPicture( p_sys->p_synchro,
370 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
371 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
372 vout_SynchroDecode( p_sys->p_synchro );
373 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
374 p_sys->b_slice_i = 1;
376 p_sys->b_after_sequence_header = 0;
379 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
380 ( ( p_sys->p_info->current_picture->pts ==
381 (uint32_t)p_sys->i_current_pts ) ?
382 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
385 /* Hack to handle demuxers which only have DTS timestamps */
386 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
388 if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
389 (p_sys->p_info->current_picture->flags &
390 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
392 i_pts = p_block->i_dts;
395 p_block->i_pts = p_block->i_dts = 0;
398 #else /* New interface */
400 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
401 ( ( p_sys->p_info->current_picture->tag ==
402 (uint32_t)p_sys->i_current_pts ) ?
403 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
404 i_dts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
405 ( ( p_sys->p_info->current_picture->tag2 ==
406 (uint32_t)p_sys->i_current_dts ) ?
407 p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
410 vout_SynchroNewPicture( p_sys->p_synchro,
411 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
412 p_sys->p_info->current_picture->nb_fields, i_pts, i_dts,
413 p_sys->i_current_rate,
414 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
416 if( !p_dec->b_pace_control && !p_sys->b_preroll &&
418 && ((p_sys->p_info->current_picture->flags
419 & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
420 && !vout_SynchroChoose( p_sys->p_synchro,
421 p_sys->p_info->current_picture->flags
422 & PIC_MASK_CODING_TYPE,
423 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
424 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
426 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
428 vout_SynchroTrash( p_sys->p_synchro );
429 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
433 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
435 vout_SynchroDecode( p_sys->p_synchro );
437 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
439 block_Release( p_block );
443 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
444 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->format.i_width );
452 if( p_sys->p_info->display_fbuf
453 && p_sys->p_info->display_fbuf->id )
455 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
457 vout_SynchroEnd( p_sys->p_synchro,
458 p_sys->p_info->display_picture->flags
459 & PIC_MASK_CODING_TYPE,
460 p_sys->b_garbage_pic );
461 p_sys->b_garbage_pic = 0;
463 if ( p_sys->p_picture_to_destroy != p_pic )
465 p_pic->date = vout_SynchroDate( p_sys->p_synchro );
469 p_sys->p_picture_to_destroy = NULL;
474 if( p_sys->p_info->discard_fbuf &&
475 p_sys->p_info->discard_fbuf->id )
477 p_dec->pf_picture_unlink( p_dec,
478 p_sys->p_info->discard_fbuf->id );
481 /* For still frames */
482 if( state == STATE_END && p_pic ) p_pic->b_force = VLC_TRUE;
486 /* Avoid frames with identical timestamps.
487 * Especially needed for still frames in DVD menus. */
488 if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
489 p_sys->i_last_frame_pts = p_pic->date;
499 buf[0] = buf[1] = buf[2] = NULL;
501 msg_Warn( p_dec, "invalid picture encountered" );
502 if ( ( p_sys->p_info->current_picture == NULL ) ||
503 ( ( p_sys->p_info->current_picture->flags &
504 PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
506 if( p_sys->p_synchro ) vout_SynchroReset( p_sys->p_synchro );
508 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
511 if( p_sys->p_info->current_fbuf &&
512 p_sys->p_info->current_fbuf->id )
514 p_sys->b_garbage_pic = 1;
515 p_pic = p_sys->p_info->current_fbuf->id;
517 else if( !p_sys->p_info->sequence )
523 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
525 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
526 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->format.i_width );
528 p_sys->p_picture_to_destroy = p_pic;
530 memset( p_pic->p[0].p_pixels, 0,
531 p_sys->p_info->sequence->width
532 * p_sys->p_info->sequence->height );
533 memset( p_pic->p[1].p_pixels, 0x80,
534 p_sys->p_info->sequence->width
535 * p_sys->p_info->sequence->height / 4 );
536 memset( p_pic->p[2].p_pixels, 0x80,
537 p_sys->p_info->sequence->width
538 * p_sys->p_info->sequence->height / 4 );
540 if( p_sys->b_slice_i )
542 vout_SynchroNewPicture( p_sys->p_synchro,
543 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
544 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
545 vout_SynchroDecode( p_sys->p_synchro );
546 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
560 /*****************************************************************************
561 * CloseDecoder: libmpeg2 decoder destruction
562 *****************************************************************************/
563 static void CloseDecoder( vlc_object_t *p_this )
565 decoder_t *p_dec = (decoder_t *)p_this;
566 decoder_sys_t *p_sys = p_dec->p_sys;
568 if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
570 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
575 /*****************************************************************************
576 * GetNewPicture: Get a new picture from the vout and set the buf struct
577 *****************************************************************************/
578 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
580 decoder_sys_t *p_sys = p_dec->p_sys;
583 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
584 p_dec->fmt_out.video.i_visible_width =
585 p_sys->p_info->sequence->picture_width;
586 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
587 p_dec->fmt_out.video.i_visible_height =
588 p_sys->p_info->sequence->picture_height;
589 p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
590 p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
591 p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
593 if( p_sys->p_info->sequence->frame_period > 0 )
595 p_dec->fmt_out.video.i_frame_rate =
596 (uint32_t)( (uint64_t)1001000000 * 27 /
597 p_sys->p_info->sequence->frame_period );
598 p_dec->fmt_out.video.i_frame_rate_base = 1001;
601 p_dec->fmt_out.i_codec =
602 ( p_sys->p_info->sequence->chroma_height <
603 p_sys->p_info->sequence->height ) ?
604 VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
606 /* Get a new picture */
607 p_pic = p_dec->pf_vout_buffer_new( p_dec );
609 if( p_pic == NULL ) return NULL;
611 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
612 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
613 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
614 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
615 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
616 p_sys->p_info->current_picture->nb_fields : 2;
618 p_dec->pf_picture_link( p_dec, p_pic );
620 pp_buf[0] = p_pic->p[0].p_pixels;
621 pp_buf[1] = p_pic->p[1].p_pixels;
622 pp_buf[2] = p_pic->p[2].p_pixels;
627 /*****************************************************************************
628 * GetAR: Get aspect ratio
629 *****************************************************************************/
630 static void GetAR( decoder_t *p_dec )
632 decoder_sys_t *p_sys = p_dec->p_sys;
634 /* Check whether the input gave a particular aspect ratio */
635 if( p_dec->fmt_in.video.i_aspect )
637 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
638 if( p_sys->i_aspect <= AR_221_1_PICTURE )
639 switch( p_sys->i_aspect )
642 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
643 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
644 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
646 case AR_16_9_PICTURE:
647 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
648 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 16;
649 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 9;
651 case AR_221_1_PICTURE:
652 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
653 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 221;
654 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 100;
656 case AR_SQUARE_PICTURE:
657 p_sys->i_aspect = VOUT_ASPECT_FACTOR *
658 p_sys->p_info->sequence->picture_width /
659 p_sys->p_info->sequence->picture_height;
660 p_sys->i_sar_num = p_sys->i_sar_den = 1;
666 /* Use the value provided in the MPEG sequence header */
667 if( p_sys->p_info->sequence->pixel_height > 0 )
670 ((uint64_t)p_sys->p_info->sequence->picture_width) *
671 p_sys->p_info->sequence->pixel_width *
673 p_sys->p_info->sequence->picture_height /
674 p_sys->p_info->sequence->pixel_height;
675 p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
676 p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
680 /* Invalid aspect, assume 4:3.
681 * This shouldn't happen and if it does it is a bug
682 * in libmpeg2 (likely triggered by an invalid stream) */
683 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
684 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
685 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
689 msg_Dbg( p_dec, "%dx%d (display %d,%d), aspect %d, sar %i:%i, %u.%03u fps",
690 p_sys->p_info->sequence->picture_width,
691 p_sys->p_info->sequence->picture_height,
692 p_sys->p_info->sequence->display_width,
693 p_sys->p_info->sequence->display_height,
694 p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
695 (uint32_t)((uint64_t)1001000000 * 27 /
696 p_sys->p_info->sequence->frame_period / 1001),
697 (uint32_t)((uint64_t)1001000000 * 27 /
698 p_sys->p_info->sequence->frame_period % 1001) );