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 */
279 for( int i = 0; i < 2; i++ )
281 picture_t *p_picture = DpbNewPicture( p_dec );
285 block_Release( p_block );
288 PutPicture( p_dec, p_picture );
291 if( p_sys->p_synchro )
292 decoder_SynchroRelease( p_sys->p_synchro );
294 if( p_sys->p_info->sequence->frame_period <= 0 )
295 p_sys->p_synchro = NULL;
298 decoder_SynchroInit( p_dec, (uint32_t)(UINT64_C(1001000000) *
299 27 / p_sys->p_info->sequence->frame_period) );
300 p_sys->b_after_sequence_header = true;
305 /* There can be userdata in a GOP. It needs to be remembered for the next picture. */
306 if( p_sys->p_info->user_data_len > 2 )
308 free( p_sys->p_gop_user_data );
309 p_sys->p_gop_user_data = calloc( p_sys->p_info->user_data_len, sizeof(uint8_t) );
310 if( p_sys->p_gop_user_data )
312 p_sys->i_gop_user_data = p_sys->p_info->user_data_len;
313 memcpy( p_sys->p_gop_user_data, p_sys->p_info->user_data, p_sys->p_info->user_data_len );
320 const mpeg2_info_t *p_info = p_sys->p_info;
321 const mpeg2_picture_t *p_current = p_info->current_picture;
323 mtime_t i_pts, i_dts;
325 if( p_sys->b_after_sequence_header &&
327 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
329 /* Intra-slice refresh. Simulate a blank I picture. */
330 msg_Dbg( p_dec, "intra-slice refresh stream" );
331 decoder_SynchroNewPicture( p_sys->p_synchro,
332 I_CODING_TYPE, 2, 0, 0,
333 p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
334 decoder_SynchroDecode( p_sys->p_synchro );
335 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
336 p_sys->b_slice_i = true;
338 p_sys->b_after_sequence_header = false;
341 i_pts = p_current->flags & PIC_FLAG_PTS ?
342 ( ( p_current->pts ==
343 (uint32_t)p_sys->i_current_pts ) ?
344 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
347 /* Hack to handle demuxers which only have DTS timestamps */
348 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
350 if( p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
352 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
354 i_pts = p_block->i_dts;
357 p_block->i_pts = p_block->i_dts = 0;
360 #else /* New interface */
362 i_pts = p_current->flags & PIC_FLAG_TAGS ?
363 ( ( p_current->tag == (uint32_t)p_sys->i_current_pts ) ?
364 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
365 i_dts = p_current->flags & PIC_FLAG_TAGS ?
366 ( ( p_current->tag2 == (uint32_t)p_sys->i_current_dts ) ?
367 p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
370 /* If nb_fields == 1, it is a field picture, and it will be
371 * followed by another field picture for which we won't call
372 * decoder_SynchroNewPicture() because this would have other
373 * problems, so we take it into account here.
374 * This kind of sucks, but I didn't think better. --Meuuh
376 decoder_SynchroNewPicture( p_sys->p_synchro,
377 p_current->flags & PIC_MASK_CODING_TYPE,
378 p_current->nb_fields == 1 ? 2 :
379 p_current->nb_fields, i_pts, i_dts,
380 p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
384 if( !p_dec->b_pace_control && !p_sys->b_preroll &&
386 && ((p_current->flags
387 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P))
388 && !decoder_SynchroChoose( p_sys->p_synchro,
390 & PIC_MASK_CODING_TYPE,
391 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
392 p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
400 p_pic = DpbNewPicture( p_dec );
405 p_pic = DpbNewPicture( p_dec );
408 mpeg2_reset( p_sys->p_mpeg2dec, 1 );
409 block_Release( p_block );
415 if( b_skip || !p_pic )
417 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
418 p_sys->b_skip = true;
419 decoder_SynchroTrash( p_sys->p_synchro );
421 PutPicture( p_dec, NULL );
425 block_Release( p_block );
431 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
432 p_sys->b_skip = false;
433 decoder_SynchroDecode( p_sys->p_synchro );
435 PutPicture( p_dec, p_pic );
437 if( p_info->user_data_len > 2 || p_sys->i_gop_user_data > 2 )
439 p_sys->i_cc_pts = i_pts;
440 p_sys->i_cc_dts = i_dts;
441 if( (p_current->flags
442 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
443 p_sys->i_cc_flags = BLOCK_FLAG_TYPE_P;
444 else if( (p_current->flags
445 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
446 p_sys->i_cc_flags = BLOCK_FLAG_TYPE_B;
447 else p_sys->i_cc_flags = BLOCK_FLAG_TYPE_I;
449 if( p_sys->i_gop_user_data > 2 )
451 /* We now have picture info for any cached user_data out of the gop */
452 cc_Extract( &p_sys->cc, &p_sys->p_gop_user_data[0], p_sys->i_gop_user_data );
453 p_sys->i_gop_user_data = 0;
456 /* Extract the CC from the user_data of the picture */
457 if( p_info->user_data_len > 2 )
458 cc_Extract( &p_sys->cc, &p_info->user_data[0], p_info->user_data_len );
465 if( !p_block->i_buffer )
467 block_Release( p_block );
471 if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
472 | BLOCK_FLAG_CORRUPTED)) &&
474 p_sys->p_info->sequence &&
475 p_sys->p_info->sequence->width != (unsigned)-1 )
477 decoder_SynchroReset( p_sys->p_synchro );
478 if( p_sys->p_info->current_fbuf != NULL &&
479 p_sys->p_info->current_fbuf->id != NULL )
481 p_sys->b_garbage_pic = true;
483 if( p_sys->b_slice_i )
485 decoder_SynchroNewPicture( p_sys->p_synchro,
486 I_CODING_TYPE, 2, 0, 0,
487 p_sys->p_info->sequence->flags &
488 SEQ_FLAG_LOW_DELAY );
489 decoder_SynchroDecode( p_sys->p_synchro );
490 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
494 if( p_block->i_flags & BLOCK_FLAG_PREROLL )
496 p_sys->b_preroll = true;
498 else if( p_sys->b_preroll )
500 p_sys->b_preroll = false;
501 if( p_sys->p_synchro )
502 decoder_SynchroReset( p_sys->p_synchro );
508 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
510 #else /* New interface */
511 if( p_block->i_pts || p_block->i_dts )
513 mpeg2_tag_picture( p_sys->p_mpeg2dec,
514 (uint32_t)p_block->i_pts,
515 (uint32_t)p_block->i_dts );
517 p_sys->i_previous_pts = p_sys->i_current_pts;
518 p_sys->i_current_pts = p_block->i_pts;
519 p_sys->i_previous_dts = p_sys->i_current_dts;
520 p_sys->i_current_dts = p_block->i_dts;
523 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
524 p_block->p_buffer + p_block->i_buffer );
526 p_block->i_buffer = 0;
529 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
531 case STATE_SEQUENCE_MODIFIED:
535 case STATE_PICTURE_2ND:
536 p_sys->b_second_field = true;
540 case STATE_INVALID_END:
544 if( p_sys->p_info->display_fbuf &&
545 p_sys->p_info->display_fbuf->id )
547 p_pic = p_sys->p_info->display_fbuf->id;
548 if( DpbDisplayPicture( p_dec, p_pic ) )
551 decoder_SynchroEnd( p_sys->p_synchro,
552 p_sys->p_info->display_picture->flags & PIC_MASK_CODING_TYPE,
553 p_sys->b_garbage_pic );
557 p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
558 if( p_sys->b_garbage_pic )
559 p_pic->date = 0; /* ??? */
560 p_sys->b_garbage_pic = false;
564 if( p_sys->p_info->discard_fbuf &&
565 p_sys->p_info->discard_fbuf->id )
567 DpbUnlinkPicture( p_dec, p_sys->p_info->discard_fbuf->id );
570 /* For still frames */
571 if( state == STATE_END && p_pic )
572 p_pic->b_force = true;
576 /* Avoid frames with identical timestamps.
577 * Especially needed for still frames in DVD menus. */
578 if( p_sys->i_last_frame_pts == p_pic->date )
580 p_sys->i_last_frame_pts = p_pic->date;
587 msg_Err( p_dec, "invalid picture encountered" );
588 /* I don't think we have anything to do, but well without
602 /*****************************************************************************
603 * CloseDecoder: libmpeg2 decoder destruction
604 *****************************************************************************/
605 static void CloseDecoder( vlc_object_t *p_this )
607 decoder_t *p_dec = (decoder_t *)p_this;
608 decoder_sys_t *p_sys = p_dec->p_sys;
612 free( p_sys->p_gop_user_data );
614 if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
616 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
621 /*****************************************************************************
622 * Reset: reset the decoder state
623 *****************************************************************************/
624 static void Reset( decoder_t *p_dec )
626 decoder_sys_t *p_sys = p_dec->p_sys;
628 cc_Flush( &p_sys->cc );
629 mpeg2_reset( p_sys->p_mpeg2dec, 0 );
633 /*****************************************************************************
634 * GetNewPicture: Get a new picture from the vout and set the buf struct
635 *****************************************************************************/
636 static picture_t *GetNewPicture( decoder_t *p_dec )
638 decoder_sys_t *p_sys = p_dec->p_sys;
641 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
642 p_dec->fmt_out.video.i_visible_width =
643 p_sys->p_info->sequence->picture_width;
644 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
645 p_dec->fmt_out.video.i_visible_height =
646 p_sys->p_info->sequence->picture_height;
647 p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
648 p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
649 p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
651 if( p_sys->p_info->sequence->frame_period > 0 )
653 p_dec->fmt_out.video.i_frame_rate =
654 (uint32_t)( (uint64_t)1001000000 * 27 /
655 p_sys->p_info->sequence->frame_period );
656 p_dec->fmt_out.video.i_frame_rate_base = 1001;
659 p_dec->fmt_out.i_codec =
660 ( p_sys->p_info->sequence->chroma_height <
661 p_sys->p_info->sequence->height ) ?
662 VLC_CODEC_I420 : VLC_CODEC_I422;
664 /* Get a new picture */
665 p_pic = decoder_NewPicture( p_dec );
670 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
671 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
672 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
673 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
674 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
675 p_sys->p_info->current_picture->nb_fields : 2;
680 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
681 /*****************************************************************************
682 * GetCc: Retrieves the Closed Captions for the CC decoder.
683 *****************************************************************************/
684 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] )
686 decoder_sys_t *p_sys = p_dec->p_sys;
687 block_t *p_cc = NULL;
690 for( i = 0; i < 4; i++ )
691 pb_present[i] = p_sys->cc.pb_present[i];
693 if( p_sys->cc.i_data <= 0 )
696 p_cc = block_New( p_dec, p_sys->cc.i_data);
699 memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
701 p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
702 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);
704 cc_Flush( &p_sys->cc );
709 /*****************************************************************************
710 * GetAR: Get aspect ratio
711 *****************************************************************************/
712 static void GetAR( decoder_t *p_dec )
714 decoder_sys_t *p_sys = p_dec->p_sys;
715 int i_old_aspect = p_sys->i_aspect;
717 /* Check whether the input gave a particular aspect ratio */
718 if( p_dec->fmt_in.video.i_aspect )
720 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
724 /* Use the value provided in the MPEG sequence header */
725 if( p_sys->p_info->sequence->pixel_height > 0 )
728 ((uint64_t)p_sys->p_info->sequence->picture_width) *
729 p_sys->p_info->sequence->pixel_width *
731 p_sys->p_info->sequence->picture_height /
732 p_sys->p_info->sequence->pixel_height;
733 p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
734 p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
738 /* Invalid aspect, assume 4:3.
739 * This shouldn't happen and if it does it is a bug
740 * in libmpeg2 (likely triggered by an invalid stream) */
741 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
742 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
743 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
747 if( p_sys->i_aspect == i_old_aspect )
750 if( p_sys->p_info->sequence->frame_period > 0 )
752 "%dx%d (display %d,%d), aspect %d, sar %i:%i, %u.%03u fps",
753 p_sys->p_info->sequence->picture_width,
754 p_sys->p_info->sequence->picture_height,
755 p_sys->p_info->sequence->display_width,
756 p_sys->p_info->sequence->display_height,
757 p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
758 (uint32_t)((uint64_t)1001000000 * 27 /
759 p_sys->p_info->sequence->frame_period / 1001),
760 (uint32_t)((uint64_t)1001000000 * 27 /
761 p_sys->p_info->sequence->frame_period % 1001) );
763 msg_Dbg( p_dec, "bad frame period" );
766 /*****************************************************************************
767 * PutPicture: Put a picture_t in mpeg2 context
768 *****************************************************************************/
769 static void PutPicture( decoder_t *p_dec, picture_t *p_picture )
771 decoder_sys_t *p_sys = p_dec->p_sys;
775 for( int j = 0; j < 3; j++ )
776 pp_buf[j] = p_picture ? p_picture->p[j].p_pixels : NULL;
777 mpeg2_set_buf( p_sys->p_mpeg2dec, pp_buf, p_picture );
779 /* Completly broken API, why the hell does it suppose
780 * the stride of the chroma planes ! */
782 mpeg2_stride( p_sys->p_mpeg2dec, p_picture->p[Y_PLANE].i_pitch );
787 * Initialize a virtual Decoded Picture Buffer to workaround
788 * libmpeg2 deficient API
790 static void DpbInit( decoder_t *p_dec )
792 decoder_sys_t *p_sys = p_dec->p_sys;
794 for( int i = 0; i < DPB_COUNT; i++ )
795 p_sys->p_dpb[i].p_picture = NULL;
798 * Empty and reset the current DPB
800 static void DpbClean( decoder_t *p_dec )
802 decoder_sys_t *p_sys = p_dec->p_sys;
804 for( int i = 0; i < DPB_COUNT; i++ )
806 picture_dpb_t *p = &p_sys->p_dpb[i];
810 decoder_UnlinkPicture( p_dec, p->p_picture );
811 if( !p->b_displayed )
812 decoder_DeletePicture( p_dec, p->p_picture );
818 * Retreive a picture and reserve a place in the DPB
820 static picture_t *DpbNewPicture( decoder_t *p_dec )
822 decoder_sys_t *p_sys = p_dec->p_sys;
827 for( i = 0; i < DPB_COUNT; i++ )
829 p = &p_sys->p_dpb[i];
835 msg_Err( p_dec, "Leaking picture" );
839 p->p_picture = GetNewPicture( p_dec );
842 decoder_LinkPicture( p_dec, p->p_picture );
844 p->b_displayed = false;
846 p->p_picture->date = 0;
850 static picture_dpb_t *DpbFindPicture( decoder_t *p_dec, picture_t *p_picture )
852 decoder_sys_t *p_sys = p_dec->p_sys;
854 for( int i = 0; i < DPB_COUNT; i++ )
856 picture_dpb_t *p = &p_sys->p_dpb[i];
857 if( p->p_picture == p_picture )
863 * Unlink the provided picture and ensure that the decoder
864 * does not own it anymore.
866 static void DpbUnlinkPicture( decoder_t *p_dec, picture_t *p_picture )
868 picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
870 /* XXX it is needed to workaround libmpeg2 bugs */
871 if( !p || !p->b_linked )
873 msg_Err( p_dec, "DpbUnlinkPicture called on an invalid picture" );
877 assert( p && p->b_linked );
879 decoder_UnlinkPicture( p_dec, p->p_picture );
882 if( !p->b_displayed )
883 decoder_DeletePicture( p_dec, p->p_picture );
887 * Mark the provided picture as displayed.
889 static int DpbDisplayPicture( decoder_t *p_dec, picture_t *p_picture )
891 picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
893 /* XXX it is needed to workaround libmpeg2 bugs */
894 if( !p || p->b_displayed || !p->b_linked )
896 msg_Err( p_dec, "DpbDisplayPicture called on an invalid picture" );
900 assert( p && !p->b_displayed && p->b_linked );
902 p->b_displayed = true;