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 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
107 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] );
110 static picture_t *GetNewPicture( decoder_t * );
111 static void PutPicture( decoder_t *, picture_t * );
113 static void GetAR( decoder_t *p_dec );
115 static void Reset( decoder_t *p_dec );
118 static void DpbInit( decoder_t * );
119 static void DpbClean( decoder_t * );
120 static picture_t *DpbNewPicture( decoder_t * );
121 static void DpbUnlinkPicture( decoder_t *, picture_t * );
122 static int DpbDisplayPicture( decoder_t *, picture_t * );
124 /*****************************************************************************
126 *****************************************************************************/
128 set_description( N_("MPEG I/II video decoder (using libmpeg2)") )
129 set_capability( "decoder", 150 )
130 set_category( CAT_INPUT )
131 set_subcategory( SUBCAT_INPUT_VCODEC )
132 set_callbacks( OpenDecoder, CloseDecoder )
133 add_shortcut( "libmpeg2" )
136 /*****************************************************************************
137 * OpenDecoder: probe the decoder and return score
138 *****************************************************************************/
139 static int OpenDecoder( vlc_object_t *p_this )
141 decoder_t *p_dec = (decoder_t*)p_this;
142 decoder_sys_t *p_sys;
143 uint32_t i_accel = 0;
145 if( p_dec->fmt_in.i_codec != VLC_CODEC_MPGV )
148 /* Select onl recognized original format (standard mpeg video) */
149 switch( p_dec->fmt_in.i_original_fourcc )
151 case VLC_FOURCC('m','p','g','1'):
152 case VLC_FOURCC('m','p','g','2'):
153 case VLC_FOURCC('m','p','g','v'):
154 case VLC_FOURCC('P','I','M','1'):
155 case VLC_FOURCC('h','d','v','2'):
158 if( p_dec->fmt_in.i_original_fourcc )
163 /* Allocate the memory needed to store the decoder's structure */
164 if( ( p_dec->p_sys = p_sys = calloc( 1, sizeof(*p_sys)) ) == NULL )
167 /* Initialize the thread properties */
168 p_sys->p_mpeg2dec = NULL;
169 p_sys->p_synchro = NULL;
170 p_sys->p_info = NULL;
171 p_sys->i_current_pts = 0;
172 p_sys->i_previous_pts = 0;
173 p_sys->i_current_dts = 0;
174 p_sys->i_previous_dts = 0;
176 p_sys->b_garbage_pic = false;
177 p_sys->b_slice_i = false;
178 p_sys->b_second_field = false;
179 p_sys->b_skip = false;
180 p_sys->b_preroll = false;
185 p_sys->i_cc_flags = 0;
186 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
187 p_dec->pf_get_cc = GetCc;
188 cc_Init( &p_sys->cc );
190 p_sys->p_gop_user_data = NULL;
191 p_sys->i_gop_user_data = 0;
193 #if defined( __i386__ ) || defined( __x86_64__ )
194 if( vlc_CPU() & CPU_CAPABILITY_MMX )
196 i_accel |= MPEG2_ACCEL_X86_MMX;
199 if( vlc_CPU() & CPU_CAPABILITY_3DNOW )
201 i_accel |= MPEG2_ACCEL_X86_3DNOW;
204 if( vlc_CPU() & CPU_CAPABILITY_MMXEXT )
206 i_accel |= MPEG2_ACCEL_X86_MMXEXT;
209 #elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
210 if( vlc_CPU() & CPU_CAPABILITY_ALTIVEC )
212 i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
215 #elif defined(__arm__)
216 i_accel |= MPEG2_ACCEL_ARM;
219 /* If we do not know this CPU, trust libmpeg2's feature detection */
220 i_accel = MPEG2_ACCEL_DETECT;
224 /* Set CPU acceleration features */
225 mpeg2_accel( i_accel );
227 /* Initialize decoder */
228 p_sys->p_mpeg2dec = mpeg2_init();
229 if( p_sys->p_mpeg2dec == NULL)
231 msg_Err( p_dec, "mpeg2_init() failed" );
236 p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
238 p_dec->pf_decode_video = DecodeBlock;
239 p_dec->fmt_out.i_cat = VIDEO_ES;
240 p_dec->fmt_out.i_codec = 0;
245 /*****************************************************************************
246 * RunDecoder: the libmpeg2 decoder
247 *****************************************************************************/
248 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
250 decoder_sys_t *p_sys = p_dec->p_sys;
256 if( !pp_block || !*pp_block )
260 if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY | BLOCK_FLAG_CORRUPTED) )
265 state = mpeg2_parse( p_sys->p_mpeg2dec );
275 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
277 /* Set the first 2 reference frames */
280 for( int i = 0; i < 2; i++ )
282 picture_t *p_picture = DpbNewPicture( p_dec );
286 block_Release( p_block );
289 PutPicture( p_dec, p_picture );
292 if( p_sys->p_synchro )
293 decoder_SynchroRelease( p_sys->p_synchro );
295 if( p_sys->p_info->sequence->frame_period <= 0 )
296 p_sys->p_synchro = NULL;
299 decoder_SynchroInit( p_dec, (uint32_t)(UINT64_C(1001000000) *
300 27 / p_sys->p_info->sequence->frame_period) );
301 p_sys->b_after_sequence_header = true;
306 /* There can be userdata in a GOP. It needs to be remembered for the next picture. */
307 if( p_sys->p_info->user_data_len > 2 )
309 free( p_sys->p_gop_user_data );
310 p_sys->p_gop_user_data = calloc( p_sys->p_info->user_data_len, sizeof(uint8_t) );
311 if( p_sys->p_gop_user_data )
313 p_sys->i_gop_user_data = p_sys->p_info->user_data_len;
314 memcpy( p_sys->p_gop_user_data, p_sys->p_info->user_data, p_sys->p_info->user_data_len );
321 const mpeg2_info_t *p_info = p_sys->p_info;
322 const mpeg2_picture_t *p_current = p_info->current_picture;
324 mtime_t i_pts, i_dts;
326 if( p_sys->b_after_sequence_header &&
328 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
330 /* Intra-slice refresh. Simulate a blank I picture. */
331 msg_Dbg( p_dec, "intra-slice refresh stream" );
332 decoder_SynchroNewPicture( p_sys->p_synchro,
333 I_CODING_TYPE, 2, 0, 0,
334 p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
335 decoder_SynchroDecode( p_sys->p_synchro );
336 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
337 p_sys->b_slice_i = true;
339 p_sys->b_after_sequence_header = false;
342 i_pts = p_current->flags & PIC_FLAG_PTS ?
343 ( ( p_current->pts ==
344 (uint32_t)p_sys->i_current_pts ) ?
345 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
348 /* Hack to handle demuxers which only have DTS timestamps */
349 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
351 if( p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
353 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
355 i_pts = p_block->i_dts;
358 p_block->i_pts = p_block->i_dts = 0;
361 #else /* New interface */
363 i_pts = p_current->flags & PIC_FLAG_TAGS ?
364 ( ( p_current->tag == (uint32_t)p_sys->i_current_pts ) ?
365 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
366 i_dts = p_current->flags & PIC_FLAG_TAGS ?
367 ( ( p_current->tag2 == (uint32_t)p_sys->i_current_dts ) ?
368 p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
371 /* If nb_fields == 1, it is a field picture, and it will be
372 * followed by another field picture for which we won't call
373 * decoder_SynchroNewPicture() because this would have other
374 * problems, so we take it into account here.
375 * This kind of sucks, but I didn't think better. --Meuuh
377 decoder_SynchroNewPicture( p_sys->p_synchro,
378 p_current->flags & PIC_MASK_CODING_TYPE,
379 p_current->nb_fields == 1 ? 2 :
380 p_current->nb_fields, i_pts, i_dts,
381 p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
385 if( !p_dec->b_pace_control && !p_sys->b_preroll &&
387 && ((p_current->flags
388 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P))
389 && !decoder_SynchroChoose( p_sys->p_synchro,
391 & PIC_MASK_CODING_TYPE,
392 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
393 p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
401 p_pic = DpbNewPicture( p_dec );
406 p_pic = DpbNewPicture( p_dec );
409 mpeg2_reset( p_sys->p_mpeg2dec, 1 );
410 block_Release( p_block );
416 if( b_skip || !p_pic )
418 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
419 p_sys->b_skip = true;
420 decoder_SynchroTrash( p_sys->p_synchro );
422 PutPicture( p_dec, NULL );
426 block_Release( p_block );
432 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
433 p_sys->b_skip = false;
434 decoder_SynchroDecode( p_sys->p_synchro );
436 PutPicture( p_dec, p_pic );
438 if( p_info->user_data_len > 2 || p_sys->i_gop_user_data > 2 )
440 p_sys->i_cc_pts = i_pts;
441 p_sys->i_cc_dts = i_dts;
442 if( (p_current->flags
443 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
444 p_sys->i_cc_flags = BLOCK_FLAG_TYPE_P;
445 else if( (p_current->flags
446 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
447 p_sys->i_cc_flags = BLOCK_FLAG_TYPE_B;
448 else p_sys->i_cc_flags = BLOCK_FLAG_TYPE_I;
450 if( p_sys->i_gop_user_data > 2 )
452 /* We now have picture info for any cached user_data out of the gop */
453 cc_Extract( &p_sys->cc, &p_sys->p_gop_user_data[0], p_sys->i_gop_user_data );
454 p_sys->i_gop_user_data = 0;
457 /* Extract the CC from the user_data of the picture */
458 if( p_info->user_data_len > 2 )
459 cc_Extract( &p_sys->cc, &p_info->user_data[0], p_info->user_data_len );
466 if( !p_block->i_buffer )
468 block_Release( p_block );
472 if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
473 | BLOCK_FLAG_CORRUPTED)) &&
475 p_sys->p_info->sequence &&
476 p_sys->p_info->sequence->width != (unsigned)-1 )
478 decoder_SynchroReset( p_sys->p_synchro );
479 if( p_sys->p_info->current_fbuf != NULL &&
480 p_sys->p_info->current_fbuf->id != NULL )
482 p_sys->b_garbage_pic = true;
484 if( p_sys->b_slice_i )
486 decoder_SynchroNewPicture( p_sys->p_synchro,
487 I_CODING_TYPE, 2, 0, 0,
488 p_sys->p_info->sequence->flags &
489 SEQ_FLAG_LOW_DELAY );
490 decoder_SynchroDecode( p_sys->p_synchro );
491 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
495 if( p_block->i_flags & BLOCK_FLAG_PREROLL )
497 p_sys->b_preroll = true;
499 else if( p_sys->b_preroll )
501 p_sys->b_preroll = false;
502 if( p_sys->p_synchro )
503 decoder_SynchroReset( p_sys->p_synchro );
509 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
511 #else /* New interface */
512 if( p_block->i_pts || p_block->i_dts )
514 mpeg2_tag_picture( p_sys->p_mpeg2dec,
515 (uint32_t)p_block->i_pts,
516 (uint32_t)p_block->i_dts );
518 p_sys->i_previous_pts = p_sys->i_current_pts;
519 p_sys->i_current_pts = p_block->i_pts;
520 p_sys->i_previous_dts = p_sys->i_current_dts;
521 p_sys->i_current_dts = p_block->i_dts;
524 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
525 p_block->p_buffer + p_block->i_buffer );
527 p_block->i_buffer = 0;
530 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
532 case STATE_SEQUENCE_MODIFIED:
536 case STATE_PICTURE_2ND:
537 p_sys->b_second_field = true;
541 case STATE_INVALID_END:
545 if( p_sys->p_info->display_fbuf &&
546 p_sys->p_info->display_fbuf->id )
548 p_pic = p_sys->p_info->display_fbuf->id;
549 if( DpbDisplayPicture( p_dec, p_pic ) )
552 decoder_SynchroEnd( p_sys->p_synchro,
553 p_sys->p_info->display_picture->flags & PIC_MASK_CODING_TYPE,
554 p_sys->b_garbage_pic );
558 p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
559 if( p_sys->b_garbage_pic )
560 p_pic->date = 0; /* ??? */
561 p_sys->b_garbage_pic = false;
565 if( p_sys->p_info->discard_fbuf &&
566 p_sys->p_info->discard_fbuf->id )
568 DpbUnlinkPicture( p_dec, p_sys->p_info->discard_fbuf->id );
571 /* For still frames */
572 if( state == STATE_END && p_pic )
573 p_pic->b_force = true;
577 /* Avoid frames with identical timestamps.
578 * Especially needed for still frames in DVD menus. */
579 if( p_sys->i_last_frame_pts == p_pic->date )
581 p_sys->i_last_frame_pts = p_pic->date;
588 msg_Err( p_dec, "invalid picture encountered" );
589 /* I don't think we have anything to do, but well without
603 /*****************************************************************************
604 * CloseDecoder: libmpeg2 decoder destruction
605 *****************************************************************************/
606 static void CloseDecoder( vlc_object_t *p_this )
608 decoder_t *p_dec = (decoder_t *)p_this;
609 decoder_sys_t *p_sys = p_dec->p_sys;
613 free( p_sys->p_gop_user_data );
615 if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
617 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
622 /*****************************************************************************
623 * Reset: reset the decoder state
624 *****************************************************************************/
625 static void Reset( decoder_t *p_dec )
627 decoder_sys_t *p_sys = p_dec->p_sys;
629 cc_Flush( &p_sys->cc );
630 mpeg2_reset( p_sys->p_mpeg2dec, 0 );
634 /*****************************************************************************
635 * GetNewPicture: Get a new picture from the vout and set the buf struct
636 *****************************************************************************/
637 static picture_t *GetNewPicture( decoder_t *p_dec )
639 decoder_sys_t *p_sys = p_dec->p_sys;
642 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
643 p_dec->fmt_out.video.i_visible_width =
644 p_sys->p_info->sequence->picture_width;
645 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
646 p_dec->fmt_out.video.i_visible_height =
647 p_sys->p_info->sequence->picture_height;
648 p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
649 p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
650 p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
652 if( p_sys->p_info->sequence->frame_period > 0 )
654 p_dec->fmt_out.video.i_frame_rate =
655 (uint32_t)( (uint64_t)1001000000 * 27 /
656 p_sys->p_info->sequence->frame_period );
657 p_dec->fmt_out.video.i_frame_rate_base = 1001;
660 p_dec->fmt_out.i_codec =
661 ( p_sys->p_info->sequence->chroma_height <
662 p_sys->p_info->sequence->height ) ?
663 VLC_CODEC_I420 : VLC_CODEC_I422;
665 /* Get a new picture */
666 p_pic = decoder_NewPicture( p_dec );
671 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
672 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
673 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
674 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
675 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
676 p_sys->p_info->current_picture->nb_fields : 2;
681 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
682 /*****************************************************************************
683 * GetCc: Retrieves the Closed Captions for the CC decoder.
684 *****************************************************************************/
685 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] )
687 decoder_sys_t *p_sys = p_dec->p_sys;
688 block_t *p_cc = NULL;
691 for( i = 0; i < 4; i++ )
692 pb_present[i] = p_sys->cc.pb_present[i];
694 if( p_sys->cc.i_data <= 0 )
697 p_cc = block_New( p_dec, p_sys->cc.i_data);
700 memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
702 p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
703 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);
705 cc_Flush( &p_sys->cc );
710 /*****************************************************************************
711 * GetAR: Get aspect ratio
712 *****************************************************************************/
713 static void GetAR( decoder_t *p_dec )
715 decoder_sys_t *p_sys = p_dec->p_sys;
716 int i_old_aspect = p_sys->i_aspect;
718 /* Check whether the input gave a particular aspect ratio */
719 if( p_dec->fmt_in.video.i_aspect )
721 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
725 /* Use the value provided in the MPEG sequence header */
726 if( p_sys->p_info->sequence->pixel_height > 0 )
729 ((uint64_t)p_sys->p_info->sequence->picture_width) *
730 p_sys->p_info->sequence->pixel_width *
732 p_sys->p_info->sequence->picture_height /
733 p_sys->p_info->sequence->pixel_height;
734 p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
735 p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
739 /* Invalid aspect, assume 4:3.
740 * This shouldn't happen and if it does it is a bug
741 * in libmpeg2 (likely triggered by an invalid stream) */
742 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
743 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
744 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
748 if( p_sys->i_aspect == i_old_aspect )
751 if( p_sys->p_info->sequence->frame_period > 0 )
753 "%dx%d (display %d,%d), aspect %d, sar %i:%i, %u.%03u fps",
754 p_sys->p_info->sequence->picture_width,
755 p_sys->p_info->sequence->picture_height,
756 p_sys->p_info->sequence->display_width,
757 p_sys->p_info->sequence->display_height,
758 p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
759 (uint32_t)((uint64_t)1001000000 * 27 /
760 p_sys->p_info->sequence->frame_period / 1001),
761 (uint32_t)((uint64_t)1001000000 * 27 /
762 p_sys->p_info->sequence->frame_period % 1001) );
764 msg_Dbg( p_dec, "bad frame period" );
767 /*****************************************************************************
768 * PutPicture: Put a picture_t in mpeg2 context
769 *****************************************************************************/
770 static void PutPicture( decoder_t *p_dec, picture_t *p_picture )
772 decoder_sys_t *p_sys = p_dec->p_sys;
776 for( int j = 0; j < 3; j++ )
777 pp_buf[j] = p_picture ? p_picture->p[j].p_pixels : NULL;
778 mpeg2_set_buf( p_sys->p_mpeg2dec, pp_buf, p_picture );
780 /* Completly broken API, why the hell does it suppose
781 * the stride of the chroma planes ! */
783 mpeg2_stride( p_sys->p_mpeg2dec, p_picture->p[Y_PLANE].i_pitch );
788 * Initialize a virtual Decoded Picture Buffer to workaround
789 * libmpeg2 deficient API
791 static void DpbInit( decoder_t *p_dec )
793 decoder_sys_t *p_sys = p_dec->p_sys;
795 for( int i = 0; i < DPB_COUNT; i++ )
796 p_sys->p_dpb[i].p_picture = NULL;
799 * Empty and reset the current DPB
801 static void DpbClean( decoder_t *p_dec )
803 decoder_sys_t *p_sys = p_dec->p_sys;
805 for( int i = 0; i < DPB_COUNT; i++ )
807 picture_dpb_t *p = &p_sys->p_dpb[i];
811 decoder_UnlinkPicture( p_dec, p->p_picture );
812 if( !p->b_displayed )
813 decoder_DeletePicture( p_dec, p->p_picture );
819 * Retreive a picture and reserve a place in the DPB
821 static picture_t *DpbNewPicture( decoder_t *p_dec )
823 decoder_sys_t *p_sys = p_dec->p_sys;
828 for( i = 0; i < DPB_COUNT; i++ )
830 p = &p_sys->p_dpb[i];
836 msg_Err( p_dec, "Leaking picture" );
840 p->p_picture = GetNewPicture( p_dec );
843 decoder_LinkPicture( p_dec, p->p_picture );
845 p->b_displayed = false;
847 p->p_picture->date = 0;
851 static picture_dpb_t *DpbFindPicture( decoder_t *p_dec, picture_t *p_picture )
853 decoder_sys_t *p_sys = p_dec->p_sys;
855 for( int i = 0; i < DPB_COUNT; i++ )
857 picture_dpb_t *p = &p_sys->p_dpb[i];
858 if( p->p_picture == p_picture )
864 * Unlink the provided picture and ensure that the decoder
865 * does not own it anymore.
867 static void DpbUnlinkPicture( decoder_t *p_dec, picture_t *p_picture )
869 picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
871 /* XXX it is needed to workaround libmpeg2 bugs */
872 if( !p || !p->b_linked )
874 msg_Err( p_dec, "DpbUnlinkPicture called on an invalid picture" );
878 assert( p && p->b_linked );
880 decoder_UnlinkPicture( p_dec, p->p_picture );
883 if( !p->b_displayed )
884 decoder_DeletePicture( p_dec, p->p_picture );
888 * Mark the provided picture as displayed.
890 static int DpbDisplayPicture( decoder_t *p_dec, picture_t *p_picture )
892 picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
894 /* XXX it is needed to workaround libmpeg2 bugs */
895 if( !p || p->b_displayed || !p->b_linked )
897 msg_Err( p_dec, "DpbDisplayPicture called on an invalid picture" );
901 assert( p && !p->b_displayed && p->b_linked );
903 p->b_displayed = true;