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;
260 if( !pp_block || !*pp_block )
264 if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY | BLOCK_FLAG_CORRUPTED) )
269 state = mpeg2_parse( p_sys->p_mpeg2dec );
279 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
281 /* Set the first 2 reference frames */
282 p_sys->i_sar_num = 0;
283 p_sys->i_sar_den = 0;
285 for( int i = 0; i < 2; i++ )
287 picture_t *p_picture = DpbNewPicture( p_dec );
291 block_Release( p_block );
294 PutPicture( p_dec, p_picture );
297 if( p_sys->p_synchro )
298 decoder_SynchroRelease( p_sys->p_synchro );
300 if( p_sys->p_info->sequence->frame_period <= 0 )
301 p_sys->p_synchro = NULL;
304 decoder_SynchroInit( p_dec, (uint32_t)(UINT64_C(1001000000) *
305 27 / p_sys->p_info->sequence->frame_period) );
306 p_sys->b_after_sequence_header = true;
311 /* There can be userdata in a GOP. It needs to be remembered for the next picture. */
312 if( p_sys->p_info->user_data_len > 2 )
314 free( p_sys->p_gop_user_data );
315 p_sys->p_gop_user_data = calloc( p_sys->p_info->user_data_len, sizeof(uint8_t) );
316 if( p_sys->p_gop_user_data )
318 p_sys->i_gop_user_data = p_sys->p_info->user_data_len;
319 memcpy( p_sys->p_gop_user_data, p_sys->p_info->user_data, p_sys->p_info->user_data_len );
326 const mpeg2_info_t *p_info = p_sys->p_info;
327 const mpeg2_picture_t *p_current = p_info->current_picture;
329 mtime_t i_pts, i_dts;
331 if( p_sys->b_after_sequence_header &&
333 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
335 /* Intra-slice refresh. Simulate a blank I picture. */
336 msg_Dbg( p_dec, "intra-slice refresh stream" );
337 decoder_SynchroNewPicture( p_sys->p_synchro,
338 I_CODING_TYPE, 2, 0, 0,
339 p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
340 decoder_SynchroDecode( p_sys->p_synchro );
341 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
342 p_sys->b_slice_i = true;
344 p_sys->b_after_sequence_header = false;
347 i_pts = p_current->flags & PIC_FLAG_PTS ?
348 ( ( p_current->pts ==
349 (uint32_t)p_sys->i_current_pts ) ?
350 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
353 /* Hack to handle demuxers which only have DTS timestamps */
354 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
356 if( p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
358 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
360 i_pts = p_block->i_dts;
363 p_block->i_pts = p_block->i_dts = 0;
366 #else /* New interface */
368 i_pts = p_current->flags & PIC_FLAG_TAGS ?
369 ( ( p_current->tag == (uint32_t)p_sys->i_current_pts ) ?
370 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
371 i_dts = p_current->flags & PIC_FLAG_TAGS ?
372 ( ( p_current->tag2 == (uint32_t)p_sys->i_current_dts ) ?
373 p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
376 /* If nb_fields == 1, it is a field picture, and it will be
377 * followed by another field picture for which we won't call
378 * decoder_SynchroNewPicture() because this would have other
379 * problems, so we take it into account here.
380 * This kind of sucks, but I didn't think better. --Meuuh
382 decoder_SynchroNewPicture( p_sys->p_synchro,
383 p_current->flags & PIC_MASK_CODING_TYPE,
384 p_current->nb_fields == 1 ? 2 :
385 p_current->nb_fields, i_pts, i_dts,
386 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 ) )
403 p_pic = DpbNewPicture( p_dec );
408 p_pic = DpbNewPicture( p_dec );
411 mpeg2_reset( p_sys->p_mpeg2dec, 1 );
412 block_Release( p_block );
418 mpeg2_skip( p_sys->p_mpeg2dec, p_pic == NULL );
419 p_sys->b_skip = p_pic == NULL;
421 decoder_SynchroDecode( p_sys->p_synchro );
423 decoder_SynchroTrash( p_sys->p_synchro );
425 PutPicture( p_dec, p_pic );
427 if( p_info->user_data_len > 2 || p_sys->i_gop_user_data > 2 )
429 p_sys->i_cc_pts = i_pts;
430 p_sys->i_cc_dts = i_dts;
431 if( (p_current->flags
432 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
433 p_sys->i_cc_flags = BLOCK_FLAG_TYPE_P;
434 else if( (p_current->flags
435 & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
436 p_sys->i_cc_flags = BLOCK_FLAG_TYPE_B;
437 else p_sys->i_cc_flags = BLOCK_FLAG_TYPE_I;
438 bool b_top_field_first = p_sys->p_info->current_picture->flags
439 & PIC_FLAG_TOP_FIELD_FIRST;
441 if( p_sys->i_gop_user_data > 2 )
443 /* We now have picture info for any cached user_data out of the gop */
444 cc_Extract( &p_sys->cc, b_top_field_first,
445 &p_sys->p_gop_user_data[0], p_sys->i_gop_user_data );
446 p_sys->i_gop_user_data = 0;
449 /* Extract the CC from the user_data of the picture */
450 if( p_info->user_data_len > 2 )
451 cc_Extract( &p_sys->cc, b_top_field_first,
452 &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 picture_t *p_pic = NULL;
540 if( p_sys->p_info->display_fbuf &&
541 p_sys->p_info->display_fbuf->id )
543 p_pic = p_sys->p_info->display_fbuf->id;
544 if( DpbDisplayPicture( p_dec, p_pic ) )
547 decoder_SynchroEnd( p_sys->p_synchro,
548 p_sys->p_info->display_picture->flags & PIC_MASK_CODING_TYPE,
549 p_sys->b_garbage_pic );
553 p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
554 if( p_sys->b_garbage_pic )
555 p_pic->date = 0; /* ??? */
556 p_sys->b_garbage_pic = false;
560 if( p_sys->p_info->discard_fbuf &&
561 p_sys->p_info->discard_fbuf->id )
563 DpbUnlinkPicture( p_dec, p_sys->p_info->discard_fbuf->id );
568 if( state == STATE_END )
569 p_pic->b_force = true; /* For still frames */
571 /* Avoid frames with identical timestamps.
572 * Especially needed for still frames in DVD menus. */
573 if( p_sys->i_last_frame_pts == p_pic->date )
575 p_sys->i_last_frame_pts = p_pic->date;
583 msg_Err( p_dec, "invalid picture encountered" );
584 /* I don't think we have anything to do, but well without
598 /*****************************************************************************
599 * CloseDecoder: libmpeg2 decoder destruction
600 *****************************************************************************/
601 static void CloseDecoder( vlc_object_t *p_this )
603 decoder_t *p_dec = (decoder_t *)p_this;
604 decoder_sys_t *p_sys = p_dec->p_sys;
608 free( p_sys->p_gop_user_data );
610 if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
612 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
617 /*****************************************************************************
618 * Reset: reset the decoder state
619 *****************************************************************************/
620 static void Reset( decoder_t *p_dec )
622 decoder_sys_t *p_sys = p_dec->p_sys;
624 cc_Flush( &p_sys->cc );
625 mpeg2_reset( p_sys->p_mpeg2dec, 0 );
629 /*****************************************************************************
630 * GetNewPicture: Get a new picture from the vout and set the buf struct
631 *****************************************************************************/
632 static picture_t *GetNewPicture( decoder_t *p_dec )
634 decoder_sys_t *p_sys = p_dec->p_sys;
637 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
638 p_dec->fmt_out.video.i_visible_width =
639 p_sys->p_info->sequence->picture_width;
640 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
641 p_dec->fmt_out.video.i_visible_height =
642 p_sys->p_info->sequence->picture_height;
643 p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
644 p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
646 if( p_sys->p_info->sequence->frame_period > 0 )
648 p_dec->fmt_out.video.i_frame_rate =
649 (uint32_t)( (uint64_t)1001000000 * 27 /
650 p_sys->p_info->sequence->frame_period );
651 p_dec->fmt_out.video.i_frame_rate_base = 1001;
654 p_dec->fmt_out.i_codec =
655 ( p_sys->p_info->sequence->chroma_height <
656 p_sys->p_info->sequence->height ) ?
657 VLC_CODEC_I420 : VLC_CODEC_I422;
659 /* Get a new picture */
660 p_pic = decoder_NewPicture( p_dec );
665 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
666 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
667 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
668 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
669 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
670 p_sys->p_info->current_picture->nb_fields : 2;
675 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
676 /*****************************************************************************
677 * GetCc: Retrieves the Closed Captions for the CC decoder.
678 *****************************************************************************/
679 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] )
681 decoder_sys_t *p_sys = p_dec->p_sys;
682 block_t *p_cc = NULL;
685 for( i = 0; i < 4; i++ )
686 pb_present[i] = p_sys->cc.pb_present[i];
688 if( p_sys->cc.i_data <= 0 )
691 p_cc = block_Alloc( p_sys->cc.i_data);
694 memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
696 p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
697 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);
699 cc_Flush( &p_sys->cc );
704 /*****************************************************************************
705 * GetAR: Get aspect ratio
706 *****************************************************************************/
707 static void GetAR( decoder_t *p_dec )
709 decoder_sys_t *p_sys = p_dec->p_sys;
710 int i_old_sar_num = p_sys->i_sar_num;
711 int i_old_sar_den = p_sys->i_sar_den;
713 /* Check whether the input gave a particular aspect ratio */
714 if( p_dec->fmt_in.video.i_sar_num > 0 &&
715 p_dec->fmt_in.video.i_sar_den > 0 )
717 p_sys->i_sar_num = p_dec->fmt_in.video.i_sar_num;
718 p_sys->i_sar_den = p_dec->fmt_in.video.i_sar_den;
722 /* Use the value provided in the MPEG sequence header */
723 if( p_sys->p_info->sequence->pixel_height > 0 )
725 p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
726 p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
730 /* Invalid aspect, assume 4:3.
731 * This shouldn't happen and if it does it is a bug
732 * in libmpeg2 (likely triggered by an invalid stream) */
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->i_sar_num == i_old_sar_num &&
739 p_sys->i_sar_den == i_old_sar_den )
742 if( p_sys->p_info->sequence->frame_period > 0 )
744 "%dx%d (display %d,%d), sar %i:%i, %u.%03u fps",
745 p_sys->p_info->sequence->picture_width,
746 p_sys->p_info->sequence->picture_height,
747 p_sys->p_info->sequence->display_width,
748 p_sys->p_info->sequence->display_height,
749 p_sys->i_sar_num, p_sys->i_sar_den,
750 (uint32_t)((uint64_t)1001000000 * 27 /
751 p_sys->p_info->sequence->frame_period / 1001),
752 (uint32_t)((uint64_t)1001000000 * 27 /
753 p_sys->p_info->sequence->frame_period % 1001) );
755 msg_Dbg( p_dec, "bad frame period" );
758 /*****************************************************************************
759 * PutPicture: Put a picture_t in mpeg2 context
760 *****************************************************************************/
761 static void PutPicture( decoder_t *p_dec, picture_t *p_picture )
763 decoder_sys_t *p_sys = p_dec->p_sys;
767 for( int j = 0; j < 3; j++ )
768 pp_buf[j] = p_picture ? p_picture->p[j].p_pixels : NULL;
769 mpeg2_set_buf( p_sys->p_mpeg2dec, pp_buf, p_picture );
771 /* Completly broken API, why the hell does it suppose
772 * the stride of the chroma planes ! */
774 mpeg2_stride( p_sys->p_mpeg2dec, p_picture->p[Y_PLANE].i_pitch );
779 * Initialize a virtual Decoded Picture Buffer to workaround
780 * libmpeg2 deficient API
782 static void DpbInit( decoder_t *p_dec )
784 decoder_sys_t *p_sys = p_dec->p_sys;
786 for( int i = 0; i < DPB_COUNT; i++ )
787 p_sys->p_dpb[i].p_picture = NULL;
790 * Empty and reset the current DPB
792 static void DpbClean( decoder_t *p_dec )
794 decoder_sys_t *p_sys = p_dec->p_sys;
796 for( int i = 0; i < DPB_COUNT; i++ )
798 picture_dpb_t *p = &p_sys->p_dpb[i];
802 picture_Release( p->p_picture );
803 if( !p->b_displayed )
804 picture_Release( p->p_picture );
810 * Retreive a picture and reserve a place in the DPB
812 static picture_t *DpbNewPicture( decoder_t *p_dec )
814 decoder_sys_t *p_sys = p_dec->p_sys;
819 for( i = 0; i < DPB_COUNT; i++ )
821 p = &p_sys->p_dpb[i];
827 msg_Err( p_dec, "Leaking picture" );
831 p->p_picture = GetNewPicture( p_dec );
834 picture_Hold( p->p_picture );
836 p->b_displayed = false;
838 p->p_picture->date = 0;
842 static picture_dpb_t *DpbFindPicture( decoder_t *p_dec, picture_t *p_picture )
844 decoder_sys_t *p_sys = p_dec->p_sys;
846 for( int i = 0; i < DPB_COUNT; i++ )
848 picture_dpb_t *p = &p_sys->p_dpb[i];
849 if( p->p_picture == p_picture )
855 * Unlink the provided picture and ensure that the decoder
856 * does not own it anymore.
858 static void DpbUnlinkPicture( decoder_t *p_dec, picture_t *p_picture )
860 picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
862 /* XXX it is needed to workaround libmpeg2 bugs */
863 if( !p || !p->b_linked )
865 msg_Err( p_dec, "DpbUnlinkPicture called on an invalid picture" );
869 assert( p && p->b_linked );
871 picture_Release( p->p_picture );
874 if( !p->b_displayed )
875 picture_Release( p->p_picture );
879 * Mark the provided picture as displayed.
881 static int DpbDisplayPicture( decoder_t *p_dec, picture_t *p_picture )
883 picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
885 /* XXX it is needed to workaround libmpeg2 bugs */
886 if( !p || p->b_displayed || !p->b_linked )
888 msg_Err( p_dec, "DpbDisplayPicture called on an invalid picture" );
892 assert( p && !p->b_displayed && p->b_linked );
894 p->b_displayed = true;