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 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
35 #include <vlc_codec.h>
39 #include <vlc_codec_synchro.h>
41 /*****************************************************************************
42 * decoder_sys_t : libmpeg2 decoder descriptor
43 *****************************************************************************/
49 mpeg2dec_t *p_mpeg2dec;
50 const mpeg2_info_t *p_info;
56 mtime_t i_previous_pts;
57 mtime_t i_current_pts;
58 mtime_t i_previous_dts;
59 mtime_t i_current_dts;
61 picture_t * p_picture_to_destroy;
63 bool b_after_sequence_header; /* is it the next frame after
64 * the sequence header ? */
65 bool b_slice_i; /* intra-slice refresh stream */
73 decoder_synchro_t *p_synchro;
77 mtime_t i_last_frame_pts;
81 /*****************************************************************************
83 *****************************************************************************/
84 static int OpenDecoder( vlc_object_t * );
85 static void CloseDecoder( vlc_object_t * );
87 static picture_t *DecodeBlock( decoder_t *, block_t ** );
89 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
90 static void GetAR( decoder_t *p_dec );
92 /*****************************************************************************
94 *****************************************************************************/
96 set_description( N_("MPEG I/II video decoder (using libmpeg2)") );
97 set_capability( "decoder", 150 );
98 set_category( CAT_INPUT );
99 set_subcategory( SUBCAT_INPUT_VCODEC );
100 set_callbacks( OpenDecoder, CloseDecoder );
101 add_shortcut( "libmpeg2" );
104 /*****************************************************************************
105 * OpenDecoder: probe the decoder and return score
106 *****************************************************************************/
107 static int OpenDecoder( vlc_object_t *p_this )
109 decoder_t *p_dec = (decoder_t*)p_this;
110 decoder_sys_t *p_sys;
111 uint32_t i_accel = 0;
113 if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','v') &&
114 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
115 /* Pinnacle hardware-mpeg1 */
116 p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
117 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','2','v') &&
118 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') &&
119 p_dec->fmt_in.i_codec != VLC_FOURCC('h','d','v','2') )
124 /* Allocate the memory needed to store the decoder's structure */
125 if( ( p_dec->p_sys = p_sys =
126 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
129 /* Initialize the thread properties */
130 memset( p_sys, 0, sizeof(decoder_sys_t) );
131 p_sys->p_mpeg2dec = NULL;
132 p_sys->p_synchro = NULL;
133 p_sys->p_info = NULL;
134 p_sys->i_current_pts = 0;
135 p_sys->i_previous_pts = 0;
136 p_sys->i_current_dts = 0;
137 p_sys->i_previous_dts = 0;
138 p_sys->p_picture_to_destroy = NULL;
139 p_sys->b_garbage_pic = 0;
140 p_sys->b_slice_i = 0;
141 p_sys->b_second_field = 0;
143 p_sys->b_preroll = false;
145 #if defined( __i386__ ) || defined( __x86_64__ )
146 if( vlc_CPU() & CPU_CAPABILITY_MMX )
148 i_accel |= MPEG2_ACCEL_X86_MMX;
151 if( vlc_CPU() & CPU_CAPABILITY_3DNOW )
153 i_accel |= MPEG2_ACCEL_X86_3DNOW;
156 if( vlc_CPU() & CPU_CAPABILITY_MMXEXT )
158 i_accel |= MPEG2_ACCEL_X86_MMXEXT;
161 #elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
162 if( vlc_CPU() & CPU_CAPABILITY_ALTIVEC )
164 i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
168 /* If we do not know this CPU, trust libmpeg2's feature detection */
169 i_accel = MPEG2_ACCEL_DETECT;
173 /* Set CPU acceleration features */
174 mpeg2_accel( i_accel );
176 /* Initialize decoder */
177 p_sys->p_mpeg2dec = mpeg2_init();
178 if( p_sys->p_mpeg2dec == NULL)
180 msg_Err( p_dec, "mpeg2_init() failed" );
185 p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
187 p_dec->pf_decode_video = DecodeBlock;
192 /*****************************************************************************
193 * RunDecoder: the libmpeg2 decoder
194 *****************************************************************************/
195 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
197 decoder_sys_t *p_sys = p_dec->p_sys;
203 if( !pp_block || !*pp_block ) return NULL;
209 state = mpeg2_parse( p_sys->p_mpeg2dec );
214 if( !p_block->i_buffer )
216 block_Release( p_block );
220 if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
221 | BLOCK_FLAG_CORRUPTED)) &&
223 p_sys->p_info->sequence &&
224 p_sys->p_info->sequence->width != (unsigned)-1 )
226 decoder_SynchroReset( p_sys->p_synchro );
227 if( p_sys->p_info->current_fbuf != NULL
228 && p_sys->p_info->current_fbuf->id != NULL )
230 p_sys->b_garbage_pic = 1;
231 p_pic = p_sys->p_info->current_fbuf->id;
236 buf[0] = buf[1] = buf[2] = NULL;
237 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
239 p_block->i_buffer = 0;
242 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
243 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
245 p_sys->p_picture_to_destroy = p_pic;
247 if ( p_sys->b_slice_i )
249 decoder_SynchroNewPicture( p_sys->p_synchro,
250 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
251 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
252 decoder_SynchroDecode( p_sys->p_synchro );
253 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
257 if( p_block->i_flags & BLOCK_FLAG_PREROLL )
259 p_sys->b_preroll = true;
261 else if( p_sys->b_preroll )
263 p_sys->b_preroll = false;
265 decoder_SynchroReset( p_sys->p_synchro );
271 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
273 #else /* New interface */
274 if( p_block->i_pts || p_block->i_dts )
276 mpeg2_tag_picture( p_sys->p_mpeg2dec,
277 (uint32_t)p_block->i_pts,
278 (uint32_t)p_block->i_dts );
280 p_sys->i_previous_pts = p_sys->i_current_pts;
281 p_sys->i_current_pts = p_block->i_pts;
282 p_sys->i_previous_dts = p_sys->i_current_dts;
283 p_sys->i_current_dts = p_block->i_dts;
286 p_sys->i_current_rate = p_block->i_rate;
288 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
289 p_block->p_buffer + p_block->i_buffer );
291 p_block->i_buffer = 0;
294 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
296 case STATE_SEQUENCE_MODIFIED:
303 /* Initialize video output */
305 buf[0] = buf[1] = buf[2] = NULL;
309 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
311 /* Set the first 2 reference frames */
312 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
314 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
316 block_Release( p_block );
320 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
321 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
323 /* This picture will never go through display_picture. */
326 /* For some reason, libmpeg2 will put this pic twice in
327 * discard_picture. This can be considered a bug in libmpeg2. */
328 p_dec->pf_picture_link( p_dec, p_pic );
330 if( p_sys->p_synchro )
332 decoder_SynchroRelease( p_sys->p_synchro );
334 p_sys->p_synchro = decoder_SynchroInit( p_dec,
335 (uint32_t)((uint64_t)1001000000 * 27 /
336 p_sys->p_info->sequence->frame_period) );
337 p_sys->b_after_sequence_header = 1;
341 case STATE_PICTURE_2ND:
342 p_sys->b_second_field = 1;
348 mtime_t i_pts, i_dts;
349 buf[0] = buf[1] = buf[2] = NULL;
351 if ( p_sys->b_after_sequence_header &&
352 ((p_sys->p_info->current_picture->flags &
353 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
355 /* Intra-slice refresh. Simulate a blank I picture. */
356 msg_Dbg( p_dec, "intra-slice refresh stream" );
357 decoder_SynchroNewPicture( p_sys->p_synchro,
358 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
359 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
360 decoder_SynchroDecode( p_sys->p_synchro );
361 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
362 p_sys->b_slice_i = 1;
364 p_sys->b_after_sequence_header = 0;
367 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
368 ( ( p_sys->p_info->current_picture->pts ==
369 (uint32_t)p_sys->i_current_pts ) ?
370 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
373 /* Hack to handle demuxers which only have DTS timestamps */
374 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
376 if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
377 (p_sys->p_info->current_picture->flags &
378 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
380 i_pts = p_block->i_dts;
383 p_block->i_pts = p_block->i_dts = 0;
386 #else /* New interface */
388 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
389 ( ( p_sys->p_info->current_picture->tag ==
390 (uint32_t)p_sys->i_current_pts ) ?
391 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
392 i_dts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
393 ( ( p_sys->p_info->current_picture->tag2 ==
394 (uint32_t)p_sys->i_current_dts ) ?
395 p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
398 /* If nb_fields == 1, it is a field picture, and it will be
399 * followed by another field picture for which we won't call
400 * decoder_SynchroNewPicture() because this would have other
401 * problems, so we take it into account here.
402 * This kind of sucks, but I didn't think better. --Meuuh
404 decoder_SynchroNewPicture( p_sys->p_synchro,
405 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
406 p_sys->p_info->current_picture->nb_fields == 1 ? 2 :
407 p_sys->p_info->current_picture->nb_fields, i_pts, i_dts,
408 p_sys->i_current_rate,
409 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
411 if( !p_dec->b_pace_control && !p_sys->b_preroll &&
413 && ((p_sys->p_info->current_picture->flags
414 & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
415 && !decoder_SynchroChoose( p_sys->p_synchro,
416 p_sys->p_info->current_picture->flags
417 & PIC_MASK_CODING_TYPE,
418 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
419 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
421 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
423 decoder_SynchroTrash( p_sys->p_synchro );
424 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
428 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
430 decoder_SynchroDecode( p_sys->p_synchro );
432 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
434 block_Release( p_block );
438 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
439 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
447 if( p_sys->p_info->display_fbuf
448 && p_sys->p_info->display_fbuf->id )
450 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
452 decoder_SynchroEnd( p_sys->p_synchro,
453 p_sys->p_info->display_picture->flags
454 & PIC_MASK_CODING_TYPE,
455 p_sys->b_garbage_pic );
456 p_sys->b_garbage_pic = 0;
458 if ( p_sys->p_picture_to_destroy != p_pic )
460 p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
464 p_sys->p_picture_to_destroy = NULL;
469 if( p_sys->p_info->discard_fbuf &&
470 p_sys->p_info->discard_fbuf->id )
472 p_dec->pf_picture_unlink( p_dec,
473 p_sys->p_info->discard_fbuf->id );
476 /* For still frames */
477 if( state == STATE_END && p_pic ) p_pic->b_force = true;
481 /* Avoid frames with identical timestamps.
482 * Especially needed for still frames in DVD menus. */
483 if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
484 p_sys->i_last_frame_pts = p_pic->date;
494 buf[0] = buf[1] = buf[2] = NULL;
496 msg_Warn( p_dec, "invalid picture encountered" );
497 if ( ( p_sys->p_info->current_picture == NULL ) ||
498 ( ( p_sys->p_info->current_picture->flags &
499 PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
501 if( p_sys->p_synchro ) decoder_SynchroReset( p_sys->p_synchro );
503 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
506 if( p_sys->p_info->current_fbuf &&
507 p_sys->p_info->current_fbuf->id )
509 p_sys->b_garbage_pic = 1;
510 p_pic = p_sys->p_info->current_fbuf->id;
512 else if( !p_sys->p_info->sequence )
518 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
520 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
521 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
523 p_sys->p_picture_to_destroy = p_pic;
525 memset( p_pic->p[0].p_pixels, 0,
526 p_sys->p_info->sequence->width
527 * p_sys->p_info->sequence->height );
528 memset( p_pic->p[1].p_pixels, 0x80,
529 p_sys->p_info->sequence->width
530 * p_sys->p_info->sequence->height / 4 );
531 memset( p_pic->p[2].p_pixels, 0x80,
532 p_sys->p_info->sequence->width
533 * p_sys->p_info->sequence->height / 4 );
535 if( p_sys->b_slice_i )
537 decoder_SynchroNewPicture( p_sys->p_synchro,
538 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
539 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
540 decoder_SynchroDecode( p_sys->p_synchro );
541 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
555 /*****************************************************************************
556 * CloseDecoder: libmpeg2 decoder destruction
557 *****************************************************************************/
558 static void CloseDecoder( vlc_object_t *p_this )
560 decoder_t *p_dec = (decoder_t *)p_this;
561 decoder_sys_t *p_sys = p_dec->p_sys;
563 if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
565 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
570 /*****************************************************************************
571 * GetNewPicture: Get a new picture from the vout and set the buf struct
572 *****************************************************************************/
573 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
575 decoder_sys_t *p_sys = p_dec->p_sys;
578 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
579 p_dec->fmt_out.video.i_visible_width =
580 p_sys->p_info->sequence->picture_width;
581 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
582 p_dec->fmt_out.video.i_visible_height =
583 p_sys->p_info->sequence->picture_height;
584 p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
585 p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
586 p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
588 if( p_sys->p_info->sequence->frame_period > 0 )
590 p_dec->fmt_out.video.i_frame_rate =
591 (uint32_t)( (uint64_t)1001000000 * 27 /
592 p_sys->p_info->sequence->frame_period );
593 p_dec->fmt_out.video.i_frame_rate_base = 1001;
596 p_dec->fmt_out.i_codec =
597 ( p_sys->p_info->sequence->chroma_height <
598 p_sys->p_info->sequence->height ) ?
599 VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
601 /* Get a new picture */
602 p_pic = p_dec->pf_vout_buffer_new( p_dec );
604 if( p_pic == NULL ) return NULL;
606 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
607 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
608 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
609 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
610 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
611 p_sys->p_info->current_picture->nb_fields : 2;
613 p_dec->pf_picture_link( p_dec, p_pic );
615 pp_buf[0] = p_pic->p[0].p_pixels;
616 pp_buf[1] = p_pic->p[1].p_pixels;
617 pp_buf[2] = p_pic->p[2].p_pixels;
622 /*****************************************************************************
623 * GetAR: Get aspect ratio
624 *****************************************************************************/
625 static void GetAR( decoder_t *p_dec )
627 decoder_sys_t *p_sys = p_dec->p_sys;
629 /* Check whether the input gave a particular aspect ratio */
630 if( p_dec->fmt_in.video.i_aspect )
632 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
636 /* Use the value provided in the MPEG sequence header */
637 if( p_sys->p_info->sequence->pixel_height > 0 )
640 ((uint64_t)p_sys->p_info->sequence->picture_width) *
641 p_sys->p_info->sequence->pixel_width *
643 p_sys->p_info->sequence->picture_height /
644 p_sys->p_info->sequence->pixel_height;
645 p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
646 p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
650 /* Invalid aspect, assume 4:3.
651 * This shouldn't happen and if it does it is a bug
652 * in libmpeg2 (likely triggered by an invalid stream) */
653 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
654 p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
655 p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
659 msg_Dbg( p_dec, "%dx%d (display %d,%d), aspect %d, sar %i:%i, %u.%03u fps",
660 p_sys->p_info->sequence->picture_width,
661 p_sys->p_info->sequence->picture_height,
662 p_sys->p_info->sequence->display_width,
663 p_sys->p_info->sequence->display_height,
664 p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
665 (uint32_t)((uint64_t)1001000000 * 27 /
666 p_sys->p_info->sequence->frame_period / 1001),
667 (uint32_t)((uint64_t)1001000000 * 27 /
668 p_sys->p_info->sequence->frame_period % 1001) );