1 /*****************************************************************************
2 * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
3 *****************************************************************************
4 * Copyright (C) 1999-2001 VLC authors and 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 it
11 * under the terms of the GNU Lesser General Public License as published by
12 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
26 * NOTA BENE: this module requires the linking against a library which is
27 * known to require licensing under the GNU General Public License version 2
28 * (or later). Therefore, the result of compiling this module will normally
29 * be subject to the terms of that later license.
30 *****************************************************************************/
33 /*****************************************************************************
35 *****************************************************************************/
41 #include <vlc_common.h>
42 #include <vlc_plugin.h>
43 #include <vlc_codec.h>
44 #include <vlc_block_helper.h>
46 #include "../codec/cc.h"
50 #include <vlc_codec_synchro.h>
52 /*****************************************************************************
53 * decoder_sys_t : libmpeg2 decoder descriptor
54 *****************************************************************************/
55 #define DPB_COUNT (3+1)
68 mpeg2dec_t *p_mpeg2dec;
69 const mpeg2_info_t *p_info;
75 mtime_t i_previous_pts;
76 mtime_t i_current_pts;
77 mtime_t i_previous_dts;
78 mtime_t i_current_dts;
80 bool b_after_sequence_header; /* is it the next frame after
81 * the sequence header ? */
82 bool b_slice_i; /* intra-slice refresh stream */
88 picture_dpb_t p_dpb[DPB_COUNT];
93 decoder_synchro_t *p_synchro;
96 mtime_t i_last_frame_pts;
98 /* Closed captioning support */
103 uint8_t *p_gop_user_data;
104 uint32_t i_gop_user_data;
107 /*****************************************************************************
109 *****************************************************************************/
110 static int OpenDecoder( vlc_object_t * );
111 static void CloseDecoder( vlc_object_t * );
113 static picture_t *DecodeBlock( decoder_t *, block_t ** );
114 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
115 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] );
118 static picture_t *GetNewPicture( decoder_t * );
119 static void PutPicture( decoder_t *, picture_t * );
121 static void GetAR( decoder_t *p_dec );
123 static void Reset( decoder_t *p_dec );
126 static void DpbInit( decoder_t * );
127 static void DpbClean( decoder_t * );
128 static picture_t *DpbNewPicture( decoder_t * );
129 static void DpbUnlinkPicture( decoder_t *, picture_t * );
130 static int DpbDisplayPicture( decoder_t *, picture_t * );
132 /*****************************************************************************
134 *****************************************************************************/
136 set_description( N_("MPEG I/II video decoder (using libmpeg2)") )
137 set_capability( "decoder", 50 )
138 set_category( CAT_INPUT )
139 set_subcategory( SUBCAT_INPUT_VCODEC )
140 set_callbacks( OpenDecoder, CloseDecoder )
141 add_shortcut( "libmpeg2" )
144 /*****************************************************************************
145 * OpenDecoder: probe the decoder and return score
146 *****************************************************************************/
147 static int OpenDecoder( vlc_object_t *p_this )
149 decoder_t *p_dec = (decoder_t*)p_this;
150 decoder_sys_t *p_sys;
151 uint32_t i_accel = 0;
153 if( p_dec->fmt_in.i_codec != VLC_CODEC_MPGV )
156 /* Select onl recognized original format (standard mpeg video) */
157 switch( p_dec->fmt_in.i_original_fourcc )
159 case VLC_FOURCC('m','p','g','1'):
160 case VLC_FOURCC('m','p','g','2'):
161 case VLC_FOURCC('m','p','g','v'):
162 case VLC_FOURCC('P','I','M','1'):
163 case VLC_FOURCC('h','d','v','2'):
166 if( p_dec->fmt_in.i_original_fourcc )
171 /* Allocate the memory needed to store the decoder's structure */
172 if( ( p_dec->p_sys = p_sys = calloc( 1, sizeof(*p_sys)) ) == NULL )
175 /* Initialize the thread properties */
176 p_sys->p_mpeg2dec = NULL;
177 p_sys->p_synchro = NULL;
178 p_sys->p_info = NULL;
179 p_sys->i_current_pts = 0;
180 p_sys->i_previous_pts = 0;
181 p_sys->i_current_dts = 0;
182 p_sys->i_previous_dts = 0;
183 p_sys->i_sar_num = 0;
184 p_sys->i_sar_den = 0;
185 p_sys->b_garbage_pic = false;
186 p_sys->b_slice_i = false;
187 p_sys->b_second_field = false;
188 p_sys->b_skip = false;
189 p_sys->b_preroll = false;
194 p_sys->i_cc_flags = 0;
195 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
196 p_dec->pf_get_cc = GetCc;
197 cc_Init( &p_sys->cc );
199 p_sys->p_gop_user_data = NULL;
200 p_sys->i_gop_user_data = 0;
202 #if defined( __i386__ ) || defined( __x86_64__ )
204 i_accel |= MPEG2_ACCEL_X86_MMX;
205 if( vlc_CPU_3dNOW() )
206 i_accel |= MPEG2_ACCEL_X86_3DNOW;
207 if( vlc_CPU_MMXEXT() )
208 i_accel |= MPEG2_ACCEL_X86_MMXEXT;
209 #elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
210 if( vlc_CPU_ALTIVEC() )
211 i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
213 #elif defined(__arm__)
214 # ifdef MPEG2_ACCEL_ARM
215 i_accel |= MPEG2_ACCEL_ARM;
217 # ifdef MPEG2_ACCEL_ARM_NEON
218 if( vlc_CPU_ARM_NEON() )
219 i_accel |= MPEG2_ACCEL_ARM_NEON;
224 /* If we do not know this CPU, trust libmpeg2's feature detection */
225 i_accel = MPEG2_ACCEL_DETECT;
229 /* Set CPU acceleration features */
230 mpeg2_accel( i_accel );
232 /* Initialize decoder */
233 p_sys->p_mpeg2dec = mpeg2_init();
234 if( p_sys->p_mpeg2dec == NULL)
236 msg_Err( p_dec, "mpeg2_init() failed" );
241 p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
243 p_dec->pf_decode_video = DecodeBlock;
244 p_dec->fmt_out.i_cat = VIDEO_ES;
245 p_dec->fmt_out.i_codec = 0;
250 /*****************************************************************************
251 * RunDecoder: the libmpeg2 decoder
252 *****************************************************************************/
253 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
255 decoder_sys_t *p_sys = p_dec->p_sys;
261 if( !pp_block || !*pp_block )
265 if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY | BLOCK_FLAG_CORRUPTED) )
270 state = mpeg2_parse( p_sys->p_mpeg2dec );
280 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
282 /* Set the first 2 reference frames */
283 p_sys->i_sar_num = 0;
284 p_sys->i_sar_den = 0;
286 for( int i = 0; i < 2; i++ )
288 picture_t *p_picture = DpbNewPicture( p_dec );
292 block_Release( p_block );
295 PutPicture( p_dec, p_picture );
298 if( p_sys->p_synchro )
299 decoder_SynchroRelease( p_sys->p_synchro );
301 if( p_sys->p_info->sequence->frame_period <= 0 )
302 p_sys->p_synchro = NULL;
305 decoder_SynchroInit( p_dec, (uint32_t)(UINT64_C(1001000000) *
306 27 / p_sys->p_info->sequence->frame_period) );
307 p_sys->b_after_sequence_header = true;
312 /* There can be userdata in a GOP. It needs to be remembered for the next picture. */
313 if( p_sys->p_info->user_data_len > 2 )
315 free( p_sys->p_gop_user_data );
316 p_sys->p_gop_user_data = calloc( p_sys->p_info->user_data_len, sizeof(uint8_t) );
317 if( p_sys->p_gop_user_data )
319 p_sys->i_gop_user_data = p_sys->p_info->user_data_len;
320 memcpy( p_sys->p_gop_user_data, p_sys->p_info->user_data, p_sys->p_info->user_data_len );
327 const mpeg2_info_t *p_info = p_sys->p_info;
328 const mpeg2_picture_t *p_current = p_info->current_picture;
330 mtime_t i_pts, i_dts;
332 if( p_sys->b_after_sequence_header &&
334 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
336 /* Intra-slice refresh. Simulate a blank I picture. */
337 msg_Dbg( p_dec, "intra-slice refresh stream" );
338 decoder_SynchroNewPicture( p_sys->p_synchro,
339 I_CODING_TYPE, 2, 0, 0,
340 p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
341 decoder_SynchroDecode( p_sys->p_synchro );
342 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
343 p_sys->b_slice_i = true;
345 p_sys->b_after_sequence_header = false;
348 i_pts = p_current->flags & PIC_FLAG_PTS ?
349 ( ( p_current->pts ==
350 (uint32_t)p_sys->i_current_pts ) ?
351 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
354 /* Hack to handle demuxers which only have DTS timestamps */
355 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
357 if( p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
359 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
361 i_pts = p_block->i_dts;
364 p_block->i_pts = p_block->i_dts = 0;
367 #else /* New interface */
369 i_pts = p_current->flags & PIC_FLAG_TAGS ?
370 ( ( p_current->tag == (uint32_t)p_sys->i_current_pts ) ?
371 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
372 i_dts = p_current->flags & PIC_FLAG_TAGS ?
373 ( ( p_current->tag2 == (uint32_t)p_sys->i_current_dts ) ?
374 p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
377 /* If nb_fields == 1, it is a field picture, and it will be
378 * followed by another field picture for which we won't call
379 * decoder_SynchroNewPicture() because this would have other
380 * problems, so we take it into account here.
381 * This kind of sucks, but I didn't think better. --Meuuh
383 decoder_SynchroNewPicture( p_sys->p_synchro,
384 p_current->flags & PIC_MASK_CODING_TYPE,
385 p_current->nb_fields == 1 ? 2 :
386 p_current->nb_fields, i_pts, i_dts,
387 p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
391 if( !p_dec->b_pace_control && !p_sys->b_preroll &&
393 && ((p_current->flags
394 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P))
395 && !decoder_SynchroChoose( p_sys->p_synchro,
397 & PIC_MASK_CODING_TYPE,
398 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
399 p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
407 p_pic = DpbNewPicture( p_dec );
412 p_pic = DpbNewPicture( p_dec );
415 mpeg2_reset( p_sys->p_mpeg2dec, 1 );
416 block_Release( p_block );
422 if( b_skip || !p_pic )
424 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
425 p_sys->b_skip = true;
426 decoder_SynchroTrash( p_sys->p_synchro );
428 PutPicture( p_dec, NULL );
432 block_Release( p_block );
438 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
439 p_sys->b_skip = false;
440 decoder_SynchroDecode( p_sys->p_synchro );
442 PutPicture( p_dec, p_pic );
444 if( p_info->user_data_len > 2 || p_sys->i_gop_user_data > 2 )
446 p_sys->i_cc_pts = i_pts;
447 p_sys->i_cc_dts = i_dts;
448 if( (p_current->flags
449 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
450 p_sys->i_cc_flags = BLOCK_FLAG_TYPE_P;
451 else if( (p_current->flags
452 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
453 p_sys->i_cc_flags = BLOCK_FLAG_TYPE_B;
454 else p_sys->i_cc_flags = BLOCK_FLAG_TYPE_I;
455 bool b_top_field_first = p_sys->p_info->current_picture->flags
456 & PIC_FLAG_TOP_FIELD_FIRST;
458 if( p_sys->i_gop_user_data > 2 )
460 /* We now have picture info for any cached user_data out of the gop */
461 cc_Extract( &p_sys->cc, b_top_field_first,
462 &p_sys->p_gop_user_data[0], p_sys->i_gop_user_data );
463 p_sys->i_gop_user_data = 0;
466 /* Extract the CC from the user_data of the picture */
467 if( p_info->user_data_len > 2 )
468 cc_Extract( &p_sys->cc, b_top_field_first,
469 &p_info->user_data[0], p_info->user_data_len );
476 if( !p_block->i_buffer )
478 block_Release( p_block );
482 if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
483 | BLOCK_FLAG_CORRUPTED)) &&
485 p_sys->p_info->sequence &&
486 p_sys->p_info->sequence->width != (unsigned)-1 )
488 decoder_SynchroReset( p_sys->p_synchro );
489 if( p_sys->p_info->current_fbuf != NULL &&
490 p_sys->p_info->current_fbuf->id != NULL )
492 p_sys->b_garbage_pic = true;
494 if( p_sys->b_slice_i )
496 decoder_SynchroNewPicture( p_sys->p_synchro,
497 I_CODING_TYPE, 2, 0, 0,
498 p_sys->p_info->sequence->flags &
499 SEQ_FLAG_LOW_DELAY );
500 decoder_SynchroDecode( p_sys->p_synchro );
501 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
505 if( p_block->i_flags & BLOCK_FLAG_PREROLL )
507 p_sys->b_preroll = true;
509 else if( p_sys->b_preroll )
511 p_sys->b_preroll = false;
512 if( p_sys->p_synchro )
513 decoder_SynchroReset( p_sys->p_synchro );
519 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
521 #else /* New interface */
522 if( p_block->i_pts || p_block->i_dts )
524 mpeg2_tag_picture( p_sys->p_mpeg2dec,
525 (uint32_t)p_block->i_pts,
526 (uint32_t)p_block->i_dts );
528 p_sys->i_previous_pts = p_sys->i_current_pts;
529 p_sys->i_current_pts = p_block->i_pts;
530 p_sys->i_previous_dts = p_sys->i_current_dts;
531 p_sys->i_current_dts = p_block->i_dts;
534 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
535 p_block->p_buffer + p_block->i_buffer );
537 p_block->i_buffer = 0;
540 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
542 case STATE_SEQUENCE_MODIFIED:
546 case STATE_PICTURE_2ND:
547 p_sys->b_second_field = true;
551 case STATE_INVALID_END:
555 if( p_sys->p_info->display_fbuf &&
556 p_sys->p_info->display_fbuf->id )
558 p_pic = p_sys->p_info->display_fbuf->id;
559 if( DpbDisplayPicture( p_dec, p_pic ) )
562 decoder_SynchroEnd( p_sys->p_synchro,
563 p_sys->p_info->display_picture->flags & PIC_MASK_CODING_TYPE,
564 p_sys->b_garbage_pic );
568 p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
569 if( p_sys->b_garbage_pic )
570 p_pic->date = 0; /* ??? */
571 p_sys->b_garbage_pic = false;
575 if( p_sys->p_info->discard_fbuf &&
576 p_sys->p_info->discard_fbuf->id )
578 DpbUnlinkPicture( p_dec, p_sys->p_info->discard_fbuf->id );
581 /* For still frames */
582 if( state == STATE_END && p_pic )
583 p_pic->b_force = true;
587 /* Avoid frames with identical timestamps.
588 * Especially needed for still frames in DVD menus. */
589 if( p_sys->i_last_frame_pts == p_pic->date )
591 p_sys->i_last_frame_pts = p_pic->date;
598 msg_Err( p_dec, "invalid picture encountered" );
599 /* I don't think we have anything to do, but well without
613 /*****************************************************************************
614 * CloseDecoder: libmpeg2 decoder destruction
615 *****************************************************************************/
616 static void CloseDecoder( vlc_object_t *p_this )
618 decoder_t *p_dec = (decoder_t *)p_this;
619 decoder_sys_t *p_sys = p_dec->p_sys;
623 free( p_sys->p_gop_user_data );
625 if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
627 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
632 /*****************************************************************************
633 * Reset: reset the decoder state
634 *****************************************************************************/
635 static void Reset( decoder_t *p_dec )
637 decoder_sys_t *p_sys = p_dec->p_sys;
639 cc_Flush( &p_sys->cc );
640 mpeg2_reset( p_sys->p_mpeg2dec, 0 );
644 /*****************************************************************************
645 * GetNewPicture: Get a new picture from the vout and set the buf struct
646 *****************************************************************************/
647 static picture_t *GetNewPicture( decoder_t *p_dec )
649 decoder_sys_t *p_sys = p_dec->p_sys;
652 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
653 p_dec->fmt_out.video.i_visible_width =
654 p_sys->p_info->sequence->picture_width;
655 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
656 p_dec->fmt_out.video.i_visible_height =
657 p_sys->p_info->sequence->picture_height;
658 p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
659 p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
661 if( p_sys->p_info->sequence->frame_period > 0 )
663 p_dec->fmt_out.video.i_frame_rate =
664 (uint32_t)( (uint64_t)1001000000 * 27 /
665 p_sys->p_info->sequence->frame_period );
666 p_dec->fmt_out.video.i_frame_rate_base = 1001;
669 p_dec->fmt_out.i_codec =
670 ( p_sys->p_info->sequence->chroma_height <
671 p_sys->p_info->sequence->height ) ?
672 VLC_CODEC_I420 : VLC_CODEC_I422;
674 /* Get a new picture */
675 p_pic = decoder_NewPicture( p_dec );
680 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
681 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
682 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
683 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
684 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
685 p_sys->p_info->current_picture->nb_fields : 2;
690 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
691 /*****************************************************************************
692 * GetCc: Retrieves the Closed Captions for the CC decoder.
693 *****************************************************************************/
694 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] )
696 decoder_sys_t *p_sys = p_dec->p_sys;
697 block_t *p_cc = NULL;
700 for( i = 0; i < 4; i++ )
701 pb_present[i] = p_sys->cc.pb_present[i];
703 if( p_sys->cc.i_data <= 0 )
706 p_cc = block_Alloc( p_sys->cc.i_data);
709 memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
711 p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
712 p_cc->i_flags = ( p_sys->cc.b_reorder ? p_sys->i_cc_flags : BLOCK_FLAG_TYPE_P ) & ( BLOCK_FLAG_TYPE_I|BLOCK_FLAG_TYPE_P|BLOCK_FLAG_TYPE_B);
714 cc_Flush( &p_sys->cc );
719 /*****************************************************************************
720 * GetAR: Get aspect ratio
721 *****************************************************************************/
722 static void GetAR( decoder_t *p_dec )
724 decoder_sys_t *p_sys = p_dec->p_sys;
725 int i_old_sar_num = p_sys->i_sar_num;
726 int i_old_sar_den = p_sys->i_sar_den;
728 /* Check whether the input gave a particular aspect ratio */
729 if( p_dec->fmt_in.video.i_sar_num > 0 &&
730 p_dec->fmt_in.video.i_sar_den > 0 )
732 p_sys->i_sar_num = p_dec->fmt_in.video.i_sar_num;
733 p_sys->i_sar_den = p_dec->fmt_in.video.i_sar_den;
737 /* Use the value provided in the MPEG sequence header */
738 if( p_sys->p_info->sequence->pixel_height > 0 )
740 p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
741 p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
745 /* Invalid aspect, assume 4:3.
746 * This shouldn't happen and if it does it is a bug
747 * in libmpeg2 (likely triggered by an invalid stream) */
748 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
749 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
753 if( p_sys->i_sar_num == i_old_sar_num &&
754 p_sys->i_sar_den == i_old_sar_den )
757 if( p_sys->p_info->sequence->frame_period > 0 )
759 "%dx%d (display %d,%d), sar %i:%i, %u.%03u fps",
760 p_sys->p_info->sequence->picture_width,
761 p_sys->p_info->sequence->picture_height,
762 p_sys->p_info->sequence->display_width,
763 p_sys->p_info->sequence->display_height,
764 p_sys->i_sar_num, p_sys->i_sar_den,
765 (uint32_t)((uint64_t)1001000000 * 27 /
766 p_sys->p_info->sequence->frame_period / 1001),
767 (uint32_t)((uint64_t)1001000000 * 27 /
768 p_sys->p_info->sequence->frame_period % 1001) );
770 msg_Dbg( p_dec, "bad frame period" );
773 /*****************************************************************************
774 * PutPicture: Put a picture_t in mpeg2 context
775 *****************************************************************************/
776 static void PutPicture( decoder_t *p_dec, picture_t *p_picture )
778 decoder_sys_t *p_sys = p_dec->p_sys;
782 for( int j = 0; j < 3; j++ )
783 pp_buf[j] = p_picture ? p_picture->p[j].p_pixels : NULL;
784 mpeg2_set_buf( p_sys->p_mpeg2dec, pp_buf, p_picture );
786 /* Completly broken API, why the hell does it suppose
787 * the stride of the chroma planes ! */
789 mpeg2_stride( p_sys->p_mpeg2dec, p_picture->p[Y_PLANE].i_pitch );
794 * Initialize a virtual Decoded Picture Buffer to workaround
795 * libmpeg2 deficient API
797 static void DpbInit( decoder_t *p_dec )
799 decoder_sys_t *p_sys = p_dec->p_sys;
801 for( int i = 0; i < DPB_COUNT; i++ )
802 p_sys->p_dpb[i].p_picture = NULL;
805 * Empty and reset the current DPB
807 static void DpbClean( decoder_t *p_dec )
809 decoder_sys_t *p_sys = p_dec->p_sys;
811 for( int i = 0; i < DPB_COUNT; i++ )
813 picture_dpb_t *p = &p_sys->p_dpb[i];
817 decoder_UnlinkPicture( p_dec, p->p_picture );
818 if( !p->b_displayed )
819 decoder_DeletePicture( p_dec, p->p_picture );
825 * Retreive a picture and reserve a place in the DPB
827 static picture_t *DpbNewPicture( decoder_t *p_dec )
829 decoder_sys_t *p_sys = p_dec->p_sys;
834 for( i = 0; i < DPB_COUNT; i++ )
836 p = &p_sys->p_dpb[i];
842 msg_Err( p_dec, "Leaking picture" );
846 p->p_picture = GetNewPicture( p_dec );
849 decoder_LinkPicture( p_dec, p->p_picture );
851 p->b_displayed = false;
853 p->p_picture->date = 0;
857 static picture_dpb_t *DpbFindPicture( decoder_t *p_dec, picture_t *p_picture )
859 decoder_sys_t *p_sys = p_dec->p_sys;
861 for( int i = 0; i < DPB_COUNT; i++ )
863 picture_dpb_t *p = &p_sys->p_dpb[i];
864 if( p->p_picture == p_picture )
870 * Unlink the provided picture and ensure that the decoder
871 * does not own it anymore.
873 static void DpbUnlinkPicture( decoder_t *p_dec, picture_t *p_picture )
875 picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
877 /* XXX it is needed to workaround libmpeg2 bugs */
878 if( !p || !p->b_linked )
880 msg_Err( p_dec, "DpbUnlinkPicture called on an invalid picture" );
884 assert( p && p->b_linked );
886 decoder_UnlinkPicture( p_dec, p->p_picture );
889 if( !p->b_displayed )
890 decoder_DeletePicture( p_dec, p->p_picture );
894 * Mark the provided picture as displayed.
896 static int DpbDisplayPicture( decoder_t *p_dec, picture_t *p_picture )
898 picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
900 /* XXX it is needed to workaround libmpeg2 bugs */
901 if( !p || p->b_displayed || !p->b_linked )
903 msg_Err( p_dec, "DpbDisplayPicture called on an invalid picture" );
907 assert( p && !p->b_displayed && p->b_linked );
909 p->b_displayed = true;