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 *****************************************************************************/
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
35 #include <vlc_codec.h>
36 #include <vlc_block_helper.h>
37 #include "../codec/cc.h"
41 #include <vlc_codec_synchro.h>
43 /*****************************************************************************
44 * decoder_sys_t : libmpeg2 decoder descriptor
45 *****************************************************************************/
46 #define DPB_COUNT (3+1)
59 mpeg2dec_t *p_mpeg2dec;
60 const mpeg2_info_t *p_info;
66 mtime_t i_previous_pts;
67 mtime_t i_current_pts;
68 mtime_t i_previous_dts;
69 mtime_t i_current_dts;
71 bool b_after_sequence_header; /* is it the next frame after
72 * the sequence header ? */
73 bool b_slice_i; /* intra-slice refresh stream */
79 picture_dpb_t p_dpb[DPB_COUNT];
84 decoder_synchro_t *p_synchro;
88 mtime_t i_last_frame_pts;
90 /* Closed captioning support */
95 uint8_t *p_gop_user_data;
96 uint32_t i_gop_user_data;
99 /*****************************************************************************
101 *****************************************************************************/
102 static int OpenDecoder( vlc_object_t * );
103 static void CloseDecoder( vlc_object_t * );
105 static picture_t *DecodeBlock( decoder_t *, block_t ** );
106 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] );
108 static picture_t *GetNewPicture( decoder_t * );
109 static void PutPicture( decoder_t *, picture_t * );
111 static void GetAR( decoder_t *p_dec );
113 static void Reset( decoder_t *p_dec );
116 static void DpbInit( decoder_t * );
117 static void DpbClean( decoder_t * );
118 static picture_t *DpbNewPicture( decoder_t * );
119 static void DpbUnlinkPicture( decoder_t *, picture_t * );
120 static int DpbDisplayPicture( decoder_t *, picture_t * );
122 /*****************************************************************************
124 *****************************************************************************/
126 set_description( N_("MPEG I/II video decoder (using libmpeg2)") )
127 set_capability( "decoder", 150 )
128 set_category( CAT_INPUT )
129 set_subcategory( SUBCAT_INPUT_VCODEC )
130 set_callbacks( OpenDecoder, CloseDecoder )
131 add_shortcut( "libmpeg2" )
134 /*****************************************************************************
135 * OpenDecoder: probe the decoder and return score
136 *****************************************************************************/
137 static int OpenDecoder( vlc_object_t *p_this )
139 decoder_t *p_dec = (decoder_t*)p_this;
140 decoder_sys_t *p_sys;
141 uint32_t i_accel = 0;
143 if( p_dec->fmt_in.i_codec != VLC_CODEC_MPGV )
146 /* Select onl recognized original format (standard mpeg video) */
147 switch( p_dec->fmt_in.i_original_fourcc )
149 case VLC_FOURCC('m','p','g','1'):
150 case VLC_FOURCC('m','p','g','2'):
151 case VLC_FOURCC('m','p','g','v'):
152 case VLC_FOURCC('P','I','M','1'):
153 case VLC_FOURCC('h','d','v','2'):
156 if( p_dec->fmt_in.i_original_fourcc )
161 /* Allocate the memory needed to store the decoder's structure */
162 if( ( p_dec->p_sys = p_sys = calloc( 1, sizeof(*p_sys)) ) == NULL )
165 /* Initialize the thread properties */
166 p_sys->p_mpeg2dec = NULL;
167 p_sys->p_synchro = NULL;
168 p_sys->p_info = NULL;
169 p_sys->i_current_pts = 0;
170 p_sys->i_previous_pts = 0;
171 p_sys->i_current_dts = 0;
172 p_sys->i_previous_dts = 0;
173 p_sys->b_garbage_pic = false;
174 p_sys->b_slice_i = false;
175 p_sys->b_second_field = false;
176 p_sys->b_skip = false;
177 p_sys->b_preroll = false;
182 p_sys->i_cc_flags = 0;
183 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
184 p_dec->pf_get_cc = GetCc;
185 cc_Init( &p_sys->cc );
187 p_sys->p_gop_user_data = NULL;
188 p_sys->i_gop_user_data = 0;
190 #if defined( __i386__ ) || defined( __x86_64__ )
191 if( vlc_CPU() & CPU_CAPABILITY_MMX )
193 i_accel |= MPEG2_ACCEL_X86_MMX;
196 if( vlc_CPU() & CPU_CAPABILITY_3DNOW )
198 i_accel |= MPEG2_ACCEL_X86_3DNOW;
201 if( vlc_CPU() & CPU_CAPABILITY_MMXEXT )
203 i_accel |= MPEG2_ACCEL_X86_MMXEXT;
206 #elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
207 if( vlc_CPU() & CPU_CAPABILITY_ALTIVEC )
209 i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
213 /* If we do not know this CPU, trust libmpeg2's feature detection */
214 i_accel = MPEG2_ACCEL_DETECT;
218 /* Set CPU acceleration features */
219 mpeg2_accel( i_accel );
221 /* Initialize decoder */
222 p_sys->p_mpeg2dec = mpeg2_init();
223 if( p_sys->p_mpeg2dec == NULL)
225 msg_Err( p_dec, "mpeg2_init() failed" );
230 p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
232 p_dec->pf_decode_video = DecodeBlock;
233 p_dec->fmt_out.i_cat = VIDEO_ES;
234 p_dec->fmt_out.i_codec = 0;
239 /*****************************************************************************
240 * RunDecoder: the libmpeg2 decoder
241 *****************************************************************************/
242 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
244 decoder_sys_t *p_sys = p_dec->p_sys;
250 if( !pp_block || !*pp_block )
254 if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY | BLOCK_FLAG_CORRUPTED) )
259 state = mpeg2_parse( p_sys->p_mpeg2dec );
269 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
271 /* Set the first 2 reference frames */
273 for( int i = 0; i < 2; i++ )
275 picture_t *p_picture = DpbNewPicture( p_dec );
278 /* Is it ok ? or do we need a reset ? */
279 block_Release( p_block );
282 PutPicture( p_dec, p_picture );
285 if( p_sys->p_synchro )
286 decoder_SynchroRelease( p_sys->p_synchro );
289 decoder_SynchroInit( p_dec, (uint32_t)((uint64_t)1001000000 * 27 /
290 p_sys->p_info->sequence->frame_period) );
291 p_sys->b_after_sequence_header = true;
296 /* There can be userdata in a GOP. It needs to be remembered for the next picture. */
297 if( p_sys->p_info->user_data_len > 2 )
299 free( p_sys->p_gop_user_data );
300 p_sys->p_gop_user_data = calloc( p_sys->p_info->user_data_len, sizeof(uint8_t) );
301 if( p_sys->p_gop_user_data )
303 p_sys->i_gop_user_data = p_sys->p_info->user_data_len;
304 memcpy( p_sys->p_gop_user_data, p_sys->p_info->user_data, p_sys->p_info->user_data_len );
311 const mpeg2_info_t *p_info = p_sys->p_info;
312 const mpeg2_picture_t *p_current = p_info->current_picture;
314 mtime_t i_pts, i_dts;
316 if( p_sys->b_after_sequence_header &&
318 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
320 /* Intra-slice refresh. Simulate a blank I picture. */
321 msg_Dbg( p_dec, "intra-slice refresh stream" );
322 decoder_SynchroNewPicture( p_sys->p_synchro,
323 I_CODING_TYPE, 2, 0, 0,
324 p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
325 decoder_SynchroDecode( p_sys->p_synchro );
326 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
327 p_sys->b_slice_i = true;
329 p_sys->b_after_sequence_header = false;
332 i_pts = p_current->flags & PIC_FLAG_PTS ?
333 ( ( p_current->pts ==
334 (uint32_t)p_sys->i_current_pts ) ?
335 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
338 /* Hack to handle demuxers which only have DTS timestamps */
339 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
341 if( p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
343 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
345 i_pts = p_block->i_dts;
348 p_block->i_pts = p_block->i_dts = 0;
351 #else /* New interface */
353 i_pts = p_current->flags & PIC_FLAG_TAGS ?
354 ( ( p_current->tag == (uint32_t)p_sys->i_current_pts ) ?
355 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
356 i_dts = p_current->flags & PIC_FLAG_TAGS ?
357 ( ( p_current->tag2 == (uint32_t)p_sys->i_current_dts ) ?
358 p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
361 /* If nb_fields == 1, it is a field picture, and it will be
362 * followed by another field picture for which we won't call
363 * decoder_SynchroNewPicture() because this would have other
364 * problems, so we take it into account here.
365 * This kind of sucks, but I didn't think better. --Meuuh
367 decoder_SynchroNewPicture( p_sys->p_synchro,
368 p_current->flags & PIC_MASK_CODING_TYPE,
369 p_current->nb_fields == 1 ? 2 :
370 p_current->nb_fields, i_pts, i_dts,
371 p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
375 if( !p_dec->b_pace_control && !p_sys->b_preroll &&
377 && ((p_current->flags
378 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P))
379 && !decoder_SynchroChoose( p_sys->p_synchro,
381 & PIC_MASK_CODING_TYPE,
382 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
383 p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
391 p_pic = DpbNewPicture( p_dec );
395 block_Release( p_block );
400 if( b_skip || !p_pic )
402 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
403 p_sys->b_skip = true;
404 decoder_SynchroTrash( p_sys->p_synchro );
406 PutPicture( p_dec, NULL );
410 block_Release( p_block );
416 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
417 p_sys->b_skip = false;
418 decoder_SynchroDecode( p_sys->p_synchro );
420 PutPicture( p_dec, p_pic );
422 if( p_info->user_data_len > 2 || p_sys->i_gop_user_data > 2 )
424 p_sys->i_cc_pts = i_pts;
425 p_sys->i_cc_dts = i_dts;
426 if( (p_current->flags
427 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
428 p_sys->i_cc_flags = BLOCK_FLAG_TYPE_P;
429 else if( (p_current->flags
430 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
431 p_sys->i_cc_flags = BLOCK_FLAG_TYPE_B;
432 else p_sys->i_cc_flags = BLOCK_FLAG_TYPE_I;
434 if( p_sys->i_gop_user_data > 2 )
436 /* We now have picture info for any cached user_data out of the gop */
437 cc_Extract( &p_sys->cc, &p_sys->p_gop_user_data[0], p_sys->i_gop_user_data );
438 p_sys->i_gop_user_data = 0;
441 /* Extract the CC from the user_data of the picture */
442 if( p_info->user_data_len > 2 )
443 cc_Extract( &p_sys->cc, &p_info->user_data[0], p_info->user_data_len );
450 if( !p_block->i_buffer )
452 block_Release( p_block );
456 if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
457 | BLOCK_FLAG_CORRUPTED)) &&
459 p_sys->p_info->sequence &&
460 p_sys->p_info->sequence->width != (unsigned)-1 )
462 decoder_SynchroReset( p_sys->p_synchro );
463 if( p_sys->p_info->current_fbuf != NULL &&
464 p_sys->p_info->current_fbuf->id != NULL )
466 p_sys->b_garbage_pic = true;
468 if( p_sys->b_slice_i )
470 decoder_SynchroNewPicture( p_sys->p_synchro,
471 I_CODING_TYPE, 2, 0, 0,
472 p_sys->p_info->sequence->flags &
473 SEQ_FLAG_LOW_DELAY );
474 decoder_SynchroDecode( p_sys->p_synchro );
475 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
479 if( p_block->i_flags & BLOCK_FLAG_PREROLL )
481 p_sys->b_preroll = true;
483 else if( p_sys->b_preroll )
485 p_sys->b_preroll = false;
486 if( p_sys->p_synchro )
487 decoder_SynchroReset( p_sys->p_synchro );
493 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
495 #else /* New interface */
496 if( p_block->i_pts || p_block->i_dts )
498 mpeg2_tag_picture( p_sys->p_mpeg2dec,
499 (uint32_t)p_block->i_pts,
500 (uint32_t)p_block->i_dts );
502 p_sys->i_previous_pts = p_sys->i_current_pts;
503 p_sys->i_current_pts = p_block->i_pts;
504 p_sys->i_previous_dts = p_sys->i_current_dts;
505 p_sys->i_current_dts = p_block->i_dts;
508 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
509 p_block->p_buffer + p_block->i_buffer );
511 p_block->i_buffer = 0;
514 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
516 case STATE_SEQUENCE_MODIFIED:
520 case STATE_PICTURE_2ND:
521 p_sys->b_second_field = true;
525 case STATE_INVALID_END:
529 if( p_sys->p_info->display_fbuf &&
530 p_sys->p_info->display_fbuf->id )
532 p_pic = p_sys->p_info->display_fbuf->id;
533 if( DpbDisplayPicture( p_dec, p_pic ) )
536 decoder_SynchroEnd( p_sys->p_synchro,
537 p_sys->p_info->display_picture->flags & PIC_MASK_CODING_TYPE,
538 p_sys->b_garbage_pic );
542 p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
543 if( p_sys->b_garbage_pic )
544 p_pic->date = 0; /* ??? */
545 p_sys->b_garbage_pic = false;
549 if( p_sys->p_info->discard_fbuf &&
550 p_sys->p_info->discard_fbuf->id )
552 DpbUnlinkPicture( p_dec, p_sys->p_info->discard_fbuf->id );
555 /* For still frames */
556 if( state == STATE_END && p_pic )
557 p_pic->b_force = true;
561 /* Avoid frames with identical timestamps.
562 * Especially needed for still frames in DVD menus. */
563 if( p_sys->i_last_frame_pts == p_pic->date )
565 p_sys->i_last_frame_pts = p_pic->date;
572 msg_Err( p_dec, "invalid picture encountered" );
573 /* I don't think we have anything to do, but well without
587 /*****************************************************************************
588 * CloseDecoder: libmpeg2 decoder destruction
589 *****************************************************************************/
590 static void CloseDecoder( vlc_object_t *p_this )
592 decoder_t *p_dec = (decoder_t *)p_this;
593 decoder_sys_t *p_sys = p_dec->p_sys;
597 free( p_sys->p_gop_user_data );
599 if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
601 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
606 /*****************************************************************************
607 * Reset: reset the decoder state
608 *****************************************************************************/
609 static void Reset( decoder_t *p_dec )
611 decoder_sys_t *p_sys = p_dec->p_sys;
613 cc_Flush( &p_sys->cc );
614 mpeg2_reset( p_sys->p_mpeg2dec, p_sys->p_info->sequence != NULL );
618 /*****************************************************************************
619 * GetNewPicture: Get a new picture from the vout and set the buf struct
620 *****************************************************************************/
621 static picture_t *GetNewPicture( decoder_t *p_dec )
623 decoder_sys_t *p_sys = p_dec->p_sys;
626 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
627 p_dec->fmt_out.video.i_visible_width =
628 p_sys->p_info->sequence->picture_width;
629 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
630 p_dec->fmt_out.video.i_visible_height =
631 p_sys->p_info->sequence->picture_height;
632 p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
633 p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
634 p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
636 if( p_sys->p_info->sequence->frame_period > 0 )
638 p_dec->fmt_out.video.i_frame_rate =
639 (uint32_t)( (uint64_t)1001000000 * 27 /
640 p_sys->p_info->sequence->frame_period );
641 p_dec->fmt_out.video.i_frame_rate_base = 1001;
644 p_dec->fmt_out.i_codec =
645 ( p_sys->p_info->sequence->chroma_height <
646 p_sys->p_info->sequence->height ) ?
647 VLC_CODEC_I420 : VLC_CODEC_I422;
649 /* Get a new picture */
650 p_pic = decoder_NewPicture( p_dec );
655 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
656 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
657 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
658 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
659 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
660 p_sys->p_info->current_picture->nb_fields : 2;
665 /*****************************************************************************
666 * GetCc: Retrieves the Closed Captions for the CC decoder.
667 *****************************************************************************/
668 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] )
670 decoder_sys_t *p_sys = p_dec->p_sys;
671 block_t *p_cc = NULL;
674 for( i = 0; i < 4; i++ )
675 pb_present[i] = p_sys->cc.pb_present[i];
677 if( p_sys->cc.i_data <= 0 )
680 p_cc = block_New( p_dec, p_sys->cc.i_data);
683 memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
685 p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
686 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);
688 cc_Flush( &p_sys->cc );
692 /*****************************************************************************
693 * GetAR: Get aspect ratio
694 *****************************************************************************/
695 static void GetAR( decoder_t *p_dec )
697 decoder_sys_t *p_sys = p_dec->p_sys;
699 /* Check whether the input gave a particular aspect ratio */
700 if( p_dec->fmt_in.video.i_aspect )
702 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
706 /* Use the value provided in the MPEG sequence header */
707 if( p_sys->p_info->sequence->pixel_height > 0 )
710 ((uint64_t)p_sys->p_info->sequence->picture_width) *
711 p_sys->p_info->sequence->pixel_width *
713 p_sys->p_info->sequence->picture_height /
714 p_sys->p_info->sequence->pixel_height;
715 p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
716 p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
720 /* Invalid aspect, assume 4:3.
721 * This shouldn't happen and if it does it is a bug
722 * in libmpeg2 (likely triggered by an invalid stream) */
723 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
724 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
725 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
729 msg_Dbg( p_dec, "%dx%d (display %d,%d), aspect %d, sar %i:%i, %u.%03u fps",
730 p_sys->p_info->sequence->picture_width,
731 p_sys->p_info->sequence->picture_height,
732 p_sys->p_info->sequence->display_width,
733 p_sys->p_info->sequence->display_height,
734 p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
735 (uint32_t)((uint64_t)1001000000 * 27 /
736 p_sys->p_info->sequence->frame_period / 1001),
737 (uint32_t)((uint64_t)1001000000 * 27 /
738 p_sys->p_info->sequence->frame_period % 1001) );
741 /*****************************************************************************
742 * PutPicture: Put a picture_t in mpeg2 context
743 *****************************************************************************/
744 static void PutPicture( decoder_t *p_dec, picture_t *p_picture )
746 decoder_sys_t *p_sys = p_dec->p_sys;
750 for( int j = 0; j < 3; j++ )
751 pp_buf[j] = p_picture ? p_picture->p[j].p_pixels : NULL;
752 mpeg2_set_buf( p_sys->p_mpeg2dec, pp_buf, p_picture );
754 /* Completly broken API, why the hell does it suppose
755 * the stride of the chroma planes ! */
757 mpeg2_stride( p_sys->p_mpeg2dec, p_picture->p[Y_PLANE].i_pitch );
762 * Initialize a virtual Decoded Picture Buffer to workaround
763 * libmpeg2 deficient API
765 static void DpbInit( decoder_t *p_dec )
767 decoder_sys_t *p_sys = p_dec->p_sys;
769 for( int i = 0; i < DPB_COUNT; i++ )
770 p_sys->p_dpb[i].p_picture = NULL;
773 * Empty and reset the current DPB
775 static void DpbClean( decoder_t *p_dec )
777 decoder_sys_t *p_sys = p_dec->p_sys;
779 for( int i = 0; i < DPB_COUNT; i++ )
781 picture_dpb_t *p = &p_sys->p_dpb[i];
785 decoder_UnlinkPicture( p_dec, p->p_picture );
786 if( !p->b_displayed )
787 decoder_DeletePicture( p_dec, p->p_picture );
793 * Retreive a picture and reserve a place in the DPB
795 static picture_t *DpbNewPicture( decoder_t *p_dec )
797 decoder_sys_t *p_sys = p_dec->p_sys;
802 for( i = 0; i < DPB_COUNT; i++ )
804 p = &p_sys->p_dpb[i];
810 msg_Err( p_dec, "Leaking picture" );
814 p->p_picture = GetNewPicture( p_dec );
817 decoder_LinkPicture( p_dec, p->p_picture );
819 p->b_displayed = false;
821 p->p_picture->date = 0;
825 static picture_dpb_t *DpbFindPicture( decoder_t *p_dec, picture_t *p_picture )
827 decoder_sys_t *p_sys = p_dec->p_sys;
829 for( int i = 0; i < DPB_COUNT; i++ )
831 picture_dpb_t *p = &p_sys->p_dpb[i];
832 if( p->p_picture == p_picture )
838 * Unlink the provided picture and ensure that the decoder
839 * does not own it anymore.
841 static void DpbUnlinkPicture( decoder_t *p_dec, picture_t *p_picture )
843 picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
845 /* XXX it is needed to workaround libmpeg2 bugs */
846 if( !p || !p->b_linked )
848 msg_Err( p_dec, "DpbUnlinkPicture called on an invalid picture" );
852 assert( p && p->b_linked );
854 decoder_UnlinkPicture( p_dec, p->p_picture );
857 if( !p->b_displayed )
858 decoder_DeletePicture( p_dec, p->p_picture );
862 * Mark the provided picture as displayed.
864 static int DpbDisplayPicture( decoder_t *p_dec, picture_t *p_picture )
866 picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
868 /* XXX it is needed to workaround libmpeg2 bugs */
869 if( !p || p->b_displayed || !p->b_linked )
871 msg_Err( p_dec, "DpbDisplayPicture called on an invalid picture" );
875 assert( p && !p->b_displayed && p->b_linked );
877 p->b_displayed = true;