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 );
288 if( p_sys->p_info->sequence->frame_period <= 0 )
289 p_sys->p_synchro = NULL;
292 decoder_SynchroInit( p_dec, (uint32_t)(UINT64_C(1001000000) *
293 27 / p_sys->p_info->sequence->frame_period) );
294 p_sys->b_after_sequence_header = true;
299 /* There can be userdata in a GOP. It needs to be remembered for the next picture. */
300 if( p_sys->p_info->user_data_len > 2 )
302 free( p_sys->p_gop_user_data );
303 p_sys->p_gop_user_data = calloc( p_sys->p_info->user_data_len, sizeof(uint8_t) );
304 if( p_sys->p_gop_user_data )
306 p_sys->i_gop_user_data = p_sys->p_info->user_data_len;
307 memcpy( p_sys->p_gop_user_data, p_sys->p_info->user_data, p_sys->p_info->user_data_len );
314 const mpeg2_info_t *p_info = p_sys->p_info;
315 const mpeg2_picture_t *p_current = p_info->current_picture;
317 mtime_t i_pts, i_dts;
319 if( p_sys->b_after_sequence_header &&
321 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
323 /* Intra-slice refresh. Simulate a blank I picture. */
324 msg_Dbg( p_dec, "intra-slice refresh stream" );
325 decoder_SynchroNewPicture( p_sys->p_synchro,
326 I_CODING_TYPE, 2, 0, 0,
327 p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
328 decoder_SynchroDecode( p_sys->p_synchro );
329 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
330 p_sys->b_slice_i = true;
332 p_sys->b_after_sequence_header = false;
335 i_pts = p_current->flags & PIC_FLAG_PTS ?
336 ( ( p_current->pts ==
337 (uint32_t)p_sys->i_current_pts ) ?
338 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
341 /* Hack to handle demuxers which only have DTS timestamps */
342 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
344 if( p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
346 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
348 i_pts = p_block->i_dts;
351 p_block->i_pts = p_block->i_dts = 0;
354 #else /* New interface */
356 i_pts = p_current->flags & PIC_FLAG_TAGS ?
357 ( ( p_current->tag == (uint32_t)p_sys->i_current_pts ) ?
358 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
359 i_dts = p_current->flags & PIC_FLAG_TAGS ?
360 ( ( p_current->tag2 == (uint32_t)p_sys->i_current_dts ) ?
361 p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
364 /* If nb_fields == 1, it is a field picture, and it will be
365 * followed by another field picture for which we won't call
366 * decoder_SynchroNewPicture() because this would have other
367 * problems, so we take it into account here.
368 * This kind of sucks, but I didn't think better. --Meuuh
370 decoder_SynchroNewPicture( p_sys->p_synchro,
371 p_current->flags & PIC_MASK_CODING_TYPE,
372 p_current->nb_fields == 1 ? 2 :
373 p_current->nb_fields, i_pts, i_dts,
374 p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
378 if( !p_dec->b_pace_control && !p_sys->b_preroll &&
380 && ((p_current->flags
381 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P))
382 && !decoder_SynchroChoose( p_sys->p_synchro,
384 & PIC_MASK_CODING_TYPE,
385 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
386 p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
394 p_pic = DpbNewPicture( p_dec );
399 p_pic = DpbNewPicture( p_dec );
402 mpeg2_reset( p_sys->p_mpeg2dec, 1 );
403 block_Release( p_block );
409 if( b_skip || !p_pic )
411 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
412 p_sys->b_skip = true;
413 decoder_SynchroTrash( p_sys->p_synchro );
415 PutPicture( p_dec, NULL );
419 block_Release( p_block );
425 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
426 p_sys->b_skip = false;
427 decoder_SynchroDecode( p_sys->p_synchro );
429 PutPicture( p_dec, p_pic );
431 if( p_info->user_data_len > 2 || p_sys->i_gop_user_data > 2 )
433 p_sys->i_cc_pts = i_pts;
434 p_sys->i_cc_dts = i_dts;
435 if( (p_current->flags
436 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
437 p_sys->i_cc_flags = BLOCK_FLAG_TYPE_P;
438 else if( (p_current->flags
439 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
440 p_sys->i_cc_flags = BLOCK_FLAG_TYPE_B;
441 else p_sys->i_cc_flags = BLOCK_FLAG_TYPE_I;
443 if( p_sys->i_gop_user_data > 2 )
445 /* We now have picture info for any cached user_data out of the gop */
446 cc_Extract( &p_sys->cc, &p_sys->p_gop_user_data[0], p_sys->i_gop_user_data );
447 p_sys->i_gop_user_data = 0;
450 /* Extract the CC from the user_data of the picture */
451 if( p_info->user_data_len > 2 )
452 cc_Extract( &p_sys->cc, &p_info->user_data[0], p_info->user_data_len );
459 if( !p_block->i_buffer )
461 block_Release( p_block );
465 if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
466 | BLOCK_FLAG_CORRUPTED)) &&
468 p_sys->p_info->sequence &&
469 p_sys->p_info->sequence->width != (unsigned)-1 )
471 decoder_SynchroReset( p_sys->p_synchro );
472 if( p_sys->p_info->current_fbuf != NULL &&
473 p_sys->p_info->current_fbuf->id != NULL )
475 p_sys->b_garbage_pic = true;
477 if( p_sys->b_slice_i )
479 decoder_SynchroNewPicture( p_sys->p_synchro,
480 I_CODING_TYPE, 2, 0, 0,
481 p_sys->p_info->sequence->flags &
482 SEQ_FLAG_LOW_DELAY );
483 decoder_SynchroDecode( p_sys->p_synchro );
484 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
488 if( p_block->i_flags & BLOCK_FLAG_PREROLL )
490 p_sys->b_preroll = true;
492 else if( p_sys->b_preroll )
494 p_sys->b_preroll = false;
495 if( p_sys->p_synchro )
496 decoder_SynchroReset( p_sys->p_synchro );
502 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
504 #else /* New interface */
505 if( p_block->i_pts || p_block->i_dts )
507 mpeg2_tag_picture( p_sys->p_mpeg2dec,
508 (uint32_t)p_block->i_pts,
509 (uint32_t)p_block->i_dts );
511 p_sys->i_previous_pts = p_sys->i_current_pts;
512 p_sys->i_current_pts = p_block->i_pts;
513 p_sys->i_previous_dts = p_sys->i_current_dts;
514 p_sys->i_current_dts = p_block->i_dts;
517 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
518 p_block->p_buffer + p_block->i_buffer );
520 p_block->i_buffer = 0;
523 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
525 case STATE_SEQUENCE_MODIFIED:
529 case STATE_PICTURE_2ND:
530 p_sys->b_second_field = true;
534 case STATE_INVALID_END:
538 if( p_sys->p_info->display_fbuf &&
539 p_sys->p_info->display_fbuf->id )
541 p_pic = p_sys->p_info->display_fbuf->id;
542 if( DpbDisplayPicture( p_dec, p_pic ) )
545 decoder_SynchroEnd( p_sys->p_synchro,
546 p_sys->p_info->display_picture->flags & PIC_MASK_CODING_TYPE,
547 p_sys->b_garbage_pic );
551 p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
552 if( p_sys->b_garbage_pic )
553 p_pic->date = 0; /* ??? */
554 p_sys->b_garbage_pic = false;
558 if( p_sys->p_info->discard_fbuf &&
559 p_sys->p_info->discard_fbuf->id )
561 DpbUnlinkPicture( p_dec, p_sys->p_info->discard_fbuf->id );
564 /* For still frames */
565 if( state == STATE_END && p_pic )
566 p_pic->b_force = true;
570 /* Avoid frames with identical timestamps.
571 * Especially needed for still frames in DVD menus. */
572 if( p_sys->i_last_frame_pts == p_pic->date )
574 p_sys->i_last_frame_pts = p_pic->date;
581 msg_Err( p_dec, "invalid picture encountered" );
582 /* I don't think we have anything to do, but well without
596 /*****************************************************************************
597 * CloseDecoder: libmpeg2 decoder destruction
598 *****************************************************************************/
599 static void CloseDecoder( vlc_object_t *p_this )
601 decoder_t *p_dec = (decoder_t *)p_this;
602 decoder_sys_t *p_sys = p_dec->p_sys;
606 free( p_sys->p_gop_user_data );
608 if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
610 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
615 /*****************************************************************************
616 * Reset: reset the decoder state
617 *****************************************************************************/
618 static void Reset( decoder_t *p_dec )
620 decoder_sys_t *p_sys = p_dec->p_sys;
622 cc_Flush( &p_sys->cc );
623 mpeg2_reset( p_sys->p_mpeg2dec, 0 );
627 /*****************************************************************************
628 * GetNewPicture: Get a new picture from the vout and set the buf struct
629 *****************************************************************************/
630 static picture_t *GetNewPicture( decoder_t *p_dec )
632 decoder_sys_t *p_sys = p_dec->p_sys;
635 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
636 p_dec->fmt_out.video.i_visible_width =
637 p_sys->p_info->sequence->picture_width;
638 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
639 p_dec->fmt_out.video.i_visible_height =
640 p_sys->p_info->sequence->picture_height;
641 p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
642 p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
643 p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
645 if( p_sys->p_info->sequence->frame_period > 0 )
647 p_dec->fmt_out.video.i_frame_rate =
648 (uint32_t)( (uint64_t)1001000000 * 27 /
649 p_sys->p_info->sequence->frame_period );
650 p_dec->fmt_out.video.i_frame_rate_base = 1001;
653 p_dec->fmt_out.i_codec =
654 ( p_sys->p_info->sequence->chroma_height <
655 p_sys->p_info->sequence->height ) ?
656 VLC_CODEC_I420 : VLC_CODEC_I422;
658 /* Get a new picture */
659 p_pic = decoder_NewPicture( p_dec );
664 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
665 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
666 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
667 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
668 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
669 p_sys->p_info->current_picture->nb_fields : 2;
674 /*****************************************************************************
675 * GetCc: Retrieves the Closed Captions for the CC decoder.
676 *****************************************************************************/
677 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] )
679 decoder_sys_t *p_sys = p_dec->p_sys;
680 block_t *p_cc = NULL;
683 for( i = 0; i < 4; i++ )
684 pb_present[i] = p_sys->cc.pb_present[i];
686 if( p_sys->cc.i_data <= 0 )
689 p_cc = block_New( p_dec, p_sys->cc.i_data);
692 memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
694 p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
695 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);
697 cc_Flush( &p_sys->cc );
701 /*****************************************************************************
702 * GetAR: Get aspect ratio
703 *****************************************************************************/
704 static void GetAR( decoder_t *p_dec )
706 decoder_sys_t *p_sys = p_dec->p_sys;
708 /* Check whether the input gave a particular aspect ratio */
709 if( p_dec->fmt_in.video.i_aspect )
711 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
715 /* Use the value provided in the MPEG sequence header */
716 if( p_sys->p_info->sequence->pixel_height > 0 )
719 ((uint64_t)p_sys->p_info->sequence->picture_width) *
720 p_sys->p_info->sequence->pixel_width *
722 p_sys->p_info->sequence->picture_height /
723 p_sys->p_info->sequence->pixel_height;
724 p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
725 p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
729 /* Invalid aspect, assume 4:3.
730 * This shouldn't happen and if it does it is a bug
731 * in libmpeg2 (likely triggered by an invalid stream) */
732 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
733 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
734 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
738 if( p_sys->p_info->sequence->frame_period > 0 )
740 "%dx%d (display %d,%d), aspect %d, sar %i:%i, %u.%03u fps",
741 p_sys->p_info->sequence->picture_width,
742 p_sys->p_info->sequence->picture_height,
743 p_sys->p_info->sequence->display_width,
744 p_sys->p_info->sequence->display_height,
745 p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
746 (uint32_t)((uint64_t)1001000000 * 27 /
747 p_sys->p_info->sequence->frame_period / 1001),
748 (uint32_t)((uint64_t)1001000000 * 27 /
749 p_sys->p_info->sequence->frame_period % 1001) );
751 msg_Dbg( p_dec, "bad frame period" );
754 /*****************************************************************************
755 * PutPicture: Put a picture_t in mpeg2 context
756 *****************************************************************************/
757 static void PutPicture( decoder_t *p_dec, picture_t *p_picture )
759 decoder_sys_t *p_sys = p_dec->p_sys;
763 for( int j = 0; j < 3; j++ )
764 pp_buf[j] = p_picture ? p_picture->p[j].p_pixels : NULL;
765 mpeg2_set_buf( p_sys->p_mpeg2dec, pp_buf, p_picture );
767 /* Completly broken API, why the hell does it suppose
768 * the stride of the chroma planes ! */
770 mpeg2_stride( p_sys->p_mpeg2dec, p_picture->p[Y_PLANE].i_pitch );
775 * Initialize a virtual Decoded Picture Buffer to workaround
776 * libmpeg2 deficient API
778 static void DpbInit( decoder_t *p_dec )
780 decoder_sys_t *p_sys = p_dec->p_sys;
782 for( int i = 0; i < DPB_COUNT; i++ )
783 p_sys->p_dpb[i].p_picture = NULL;
786 * Empty and reset the current DPB
788 static void DpbClean( decoder_t *p_dec )
790 decoder_sys_t *p_sys = p_dec->p_sys;
792 for( int i = 0; i < DPB_COUNT; i++ )
794 picture_dpb_t *p = &p_sys->p_dpb[i];
798 decoder_UnlinkPicture( p_dec, p->p_picture );
799 if( !p->b_displayed )
800 decoder_DeletePicture( p_dec, p->p_picture );
806 * Retreive a picture and reserve a place in the DPB
808 static picture_t *DpbNewPicture( decoder_t *p_dec )
810 decoder_sys_t *p_sys = p_dec->p_sys;
815 for( i = 0; i < DPB_COUNT; i++ )
817 p = &p_sys->p_dpb[i];
823 msg_Err( p_dec, "Leaking picture" );
827 p->p_picture = GetNewPicture( p_dec );
830 decoder_LinkPicture( p_dec, p->p_picture );
832 p->b_displayed = false;
834 p->p_picture->date = 0;
838 static picture_dpb_t *DpbFindPicture( decoder_t *p_dec, picture_t *p_picture )
840 decoder_sys_t *p_sys = p_dec->p_sys;
842 for( int i = 0; i < DPB_COUNT; i++ )
844 picture_dpb_t *p = &p_sys->p_dpb[i];
845 if( p->p_picture == p_picture )
851 * Unlink the provided picture and ensure that the decoder
852 * does not own it anymore.
854 static void DpbUnlinkPicture( decoder_t *p_dec, picture_t *p_picture )
856 picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
858 /* XXX it is needed to workaround libmpeg2 bugs */
859 if( !p || !p->b_linked )
861 msg_Err( p_dec, "DpbUnlinkPicture called on an invalid picture" );
865 assert( p && p->b_linked );
867 decoder_UnlinkPicture( p_dec, p->p_picture );
870 if( !p->b_displayed )
871 decoder_DeletePicture( p_dec, p->p_picture );
875 * Mark the provided picture as displayed.
877 static int DpbDisplayPicture( decoder_t *p_dec, picture_t *p_picture )
879 picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
881 /* XXX it is needed to workaround libmpeg2 bugs */
882 if( !p || p->b_displayed || !p->b_linked )
884 msg_Err( p_dec, "DpbDisplayPicture called on an invalid picture" );
888 assert( p && !p->b_displayed && p->b_linked );
890 p->b_displayed = true;