1 /*****************************************************************************
2 * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
3 *****************************************************************************
4 * Copyright (C) 1999-2001 VideoLAN
7 * Authors: Gildas Bazin <gbazin@netcourrier.com>
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
30 #include <vlc/decoder.h>
32 #include <mpeg2dec/mpeg2.h>
34 #include "vout_synchro.h"
36 /* Aspect ratio (ISO/IEC 13818-2 section 6.3.3, table 6-3) */
37 #define AR_SQUARE_PICTURE 1 /* square pixels */
38 #define AR_3_4_PICTURE 2 /* 3:4 picture (TV) */
39 #define AR_16_9_PICTURE 3 /* 16:9 picture (wide screen) */
40 #define AR_221_1_PICTURE 4 /* 2.21:1 picture (movie) */
42 /*****************************************************************************
43 * decoder_sys_t : libmpeg2 decoder descriptor
44 *****************************************************************************/
50 mpeg2dec_t *p_mpeg2dec;
51 const mpeg2_info_t *p_info;
58 mtime_t i_previous_pts;
59 mtime_t i_current_pts;
61 picture_t * p_picture_to_destroy;
62 vlc_bool_t b_garbage_pic;
63 vlc_bool_t b_after_sequence_header; /* is it the next frame after
64 * the sequence header ? */
65 vlc_bool_t b_slice_i; /* intra-slice refresh stream */
70 vout_synchro_t *p_synchro;
72 mtime_t i_last_frame_pts;
76 /*****************************************************************************
78 *****************************************************************************/
79 static int OpenDecoder( vlc_object_t * );
80 static void CloseDecoder( vlc_object_t * );
82 static picture_t *DecodeBlock( decoder_t *, block_t ** );
84 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
86 /*****************************************************************************
88 *****************************************************************************/
90 set_description( _("MPEG I/II video decoder (using libmpeg2)") );
91 set_capability( "decoder", 150 );
92 set_callbacks( OpenDecoder, CloseDecoder );
93 add_shortcut( "libmpeg2" );
96 /*****************************************************************************
97 * OpenDecoder: probe the decoder and return score
98 *****************************************************************************/
99 static int OpenDecoder( vlc_object_t *p_this )
101 decoder_t *p_dec = (decoder_t*)p_this;
102 decoder_sys_t *p_sys;
103 uint32_t i_accel = 0;
105 if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','v') &&
106 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
107 /* Pinnacle hardware-mpeg1 */
108 p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
110 p_dec->fmt_in.i_codec != VLC_FOURCC('V','C','R','2') &&
111 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') )
116 /* Allocate the memory needed to store the decoder's structure */
117 if( ( p_dec->p_sys = p_sys =
118 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
120 msg_Err( p_dec, "out of memory" );
124 /* Initialize the thread properties */
125 memset( p_sys, 0, sizeof(decoder_sys_t) );
126 p_sys->p_mpeg2dec = NULL;
127 p_sys->p_synchro = NULL;
128 p_sys->p_info = NULL;
129 p_sys->i_pts = mdate() + DEFAULT_PTS_DELAY;
130 p_sys->i_current_pts = 0;
131 p_sys->i_previous_pts = 0;
132 p_sys->p_picture_to_destroy = NULL;
133 p_sys->b_garbage_pic = 0;
134 p_sys->b_slice_i = 0;
137 #if defined( __i386__ )
138 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMX )
140 i_accel |= MPEG2_ACCEL_X86_MMX;
143 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_3DNOW )
145 i_accel |= MPEG2_ACCEL_X86_3DNOW;
148 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMXEXT )
150 i_accel |= MPEG2_ACCEL_X86_MMXEXT;
153 #elif defined( __powerpc__ ) || defined( SYS_DARWIN )
154 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_ALTIVEC )
156 i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
160 /* If we do not know this CPU, trust libmpeg2's feature detection */
161 i_accel = MPEG2_ACCEL_DETECT;
165 /* Set CPU acceleration features */
166 mpeg2_accel( i_accel );
168 /* Initialize decoder */
169 p_sys->p_mpeg2dec = mpeg2_init();
170 if( p_sys->p_mpeg2dec == NULL)
172 msg_Err( p_dec, "mpeg2_init() failed" );
177 p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
179 p_dec->pf_decode_video = DecodeBlock;
184 /*****************************************************************************
185 * RunDecoder: the libmpeg2 decoder
186 *****************************************************************************/
187 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
189 decoder_sys_t *p_sys = p_dec->p_sys;
195 if( !pp_block || !*pp_block ) return NULL;
201 state = mpeg2_parse( p_sys->p_mpeg2dec );
206 if( !p_block->i_buffer )
208 block_Release( p_block );
212 if( (p_block->i_flags&BLOCK_FLAG_DISCONTINUITY) &&
214 p_sys->p_info->sequence &&
215 p_sys->p_info->sequence->width != (unsigned)-1 )
217 vout_SynchroReset( p_sys->p_synchro );
218 if( p_sys->p_info->current_fbuf != NULL
219 && p_sys->p_info->current_fbuf->id != NULL )
221 p_sys->b_garbage_pic = 1;
222 p_pic = p_sys->p_info->current_fbuf->id;
227 buf[0] = buf[1] = buf[2] = NULL;
228 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
230 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
232 p_sys->p_picture_to_destroy = p_pic;
234 if ( p_sys->b_slice_i )
236 vout_SynchroNewPicture( p_sys->p_synchro,
237 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
238 vout_SynchroDecode( p_sys->p_synchro );
239 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
246 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
248 #else /* New interface */
249 mpeg2_tag_picture( p_sys->p_mpeg2dec,
250 (uint32_t)p_block->i_pts, 0/*dts*/ );
252 p_sys->i_previous_pts = p_sys->i_current_pts;
253 p_sys->i_current_pts = p_block->i_pts;
256 p_sys->i_current_rate = p_block->i_rate;
258 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
259 p_block->p_buffer + p_block->i_buffer );
261 p_block->i_buffer = 0;
266 /* Initialize video output */
268 buf[0] = buf[1] = buf[2] = NULL;
270 /* Check whether the input gave a particular aspect ratio */
271 if( p_dec->fmt_in.video.i_aspect )
273 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
274 if( p_sys->i_aspect <= AR_221_1_PICTURE )
275 switch( p_sys->i_aspect )
278 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
280 case AR_16_9_PICTURE:
281 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
283 case AR_221_1_PICTURE:
284 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
286 case AR_SQUARE_PICTURE:
287 p_sys->i_aspect = VOUT_ASPECT_FACTOR *
288 p_sys->p_info->sequence->width /
289 p_sys->p_info->sequence->height;
295 /* Use the value provided in the MPEG sequence header */
296 if( p_sys->p_info->sequence->pixel_height > 0 )
299 ((uint64_t)p_sys->p_info->sequence->display_width) *
300 p_sys->p_info->sequence->pixel_width *
302 p_sys->p_info->sequence->display_height /
303 p_sys->p_info->sequence->pixel_height;
307 /* Invalid aspect, assume 4:3.
308 * This shouldn't happen and if it does it is a bug
309 * in libmpeg2 (likely triggered by an invalid stream) */
310 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
314 msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
315 p_sys->p_info->sequence->width,
316 p_sys->p_info->sequence->height, p_sys->i_aspect,
317 (uint32_t)((uint64_t)1001000000 * 27 /
318 p_sys->p_info->sequence->frame_period / 1001),
319 (uint32_t)((uint64_t)1001000000 * 27 /
320 p_sys->p_info->sequence->frame_period % 1001) );
322 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
324 /* Set the first 2 reference frames */
325 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
327 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
329 block_Release( p_block );
333 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
335 /* This picture will never go through display_picture. */
338 /* For some reason, libmpeg2 will put this pic twice in
339 * discard_picture. This can be considered a bug in libmpeg2. */
340 p_dec->pf_picture_link( p_dec, p_pic );
342 if( p_sys->p_synchro )
344 vout_SynchroRelease( p_sys->p_synchro );
346 p_sys->p_synchro = vout_SynchroInit( p_dec,
347 (uint32_t)((uint64_t)1001000000 * 27 /
348 p_sys->p_info->sequence->frame_period) );
349 p_sys->b_after_sequence_header = 1;
353 case STATE_PICTURE_2ND:
354 vout_SynchroNewPicture( p_sys->p_synchro,
355 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
356 p_sys->p_info->current_picture->nb_fields,
357 0, 0, p_sys->i_current_rate );
361 vout_SynchroTrash( p_sys->p_synchro );
365 vout_SynchroDecode( p_sys->p_synchro );
373 buf[0] = buf[1] = buf[2] = NULL;
375 if ( p_sys->b_after_sequence_header &&
376 ((p_sys->p_info->current_picture->flags &
377 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
379 /* Intra-slice refresh. Simulate a blank I picture. */
380 msg_Dbg( p_dec, "intra-slice refresh stream" );
381 vout_SynchroNewPicture( p_sys->p_synchro,
382 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
383 vout_SynchroDecode( p_sys->p_synchro );
384 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
385 p_sys->b_slice_i = 1;
387 p_sys->b_after_sequence_header = 0;
390 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
391 ( ( p_sys->p_info->current_picture->pts ==
392 (uint32_t)p_sys->i_current_pts ) ?
393 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
395 #else /* New interface */
397 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
398 ( ( p_sys->p_info->current_picture->tag ==
399 (uint32_t)p_sys->i_current_pts ) ?
400 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
403 /* Hack to handle demuxers which only have DTS timestamps */
404 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
406 if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
407 (p_sys->p_info->current_picture->flags &
408 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
410 i_pts = p_block->i_dts;
413 p_block->i_pts = p_block->i_dts = 0;
416 vout_SynchroNewPicture( p_sys->p_synchro,
417 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
418 p_sys->p_info->current_picture->nb_fields, i_pts,
419 0, p_sys->i_current_rate );
421 if ( !(p_sys->b_slice_i
422 && ((p_sys->p_info->current_picture->flags
423 & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
424 && !vout_SynchroChoose( p_sys->p_synchro,
425 p_sys->p_info->current_picture->flags
426 & PIC_MASK_CODING_TYPE,
427 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/ ) )
429 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
431 vout_SynchroTrash( p_sys->p_synchro );
432 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
436 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
438 vout_SynchroDecode( p_sys->p_synchro );
440 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
442 block_Release( p_block );
446 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
454 if( p_sys->p_info->display_fbuf
455 && p_sys->p_info->display_fbuf->id )
457 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
459 vout_SynchroEnd( p_sys->p_synchro,
460 p_sys->p_info->display_picture->flags
461 & PIC_MASK_CODING_TYPE,
462 p_sys->b_garbage_pic );
463 p_sys->b_garbage_pic = 0;
465 if ( p_sys->p_picture_to_destroy != p_pic )
467 p_pic->date = vout_SynchroDate( p_sys->p_synchro );
471 p_sys->p_picture_to_destroy = NULL;
476 if( p_sys->p_info->discard_fbuf &&
477 p_sys->p_info->discard_fbuf->id )
479 p_dec->pf_picture_unlink( p_dec,
480 p_sys->p_info->discard_fbuf->id );
483 /* For still frames */
484 if( state == STATE_END && p_pic ) p_pic->b_force = VLC_TRUE;
488 /* Avoid frames with identical timestamps.
489 * Especially needed for still frames in DVD menus. */
490 if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
491 p_sys->i_last_frame_pts = p_pic->date;
501 buf[0] = buf[1] = buf[2] = NULL;
503 msg_Warn( p_dec, "invalid picture encountered" );
504 if ( ( p_sys->p_info->current_picture == NULL ) ||
505 ( ( p_sys->p_info->current_picture->flags &
506 PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
508 if( p_sys->p_synchro ) vout_SynchroReset( p_sys->p_synchro );
510 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
513 if( p_sys->p_info->current_fbuf &&
514 p_sys->p_info->current_fbuf->id )
516 p_sys->b_garbage_pic = 1;
517 p_pic = p_sys->p_info->current_fbuf->id;
519 else if( !p_sys->p_info->sequence )
525 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
527 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
529 p_sys->p_picture_to_destroy = p_pic;
531 memset( p_pic->p[0].p_pixels, 0,
532 p_sys->p_info->sequence->width
533 * p_sys->p_info->sequence->height );
534 memset( p_pic->p[1].p_pixels, 0x80,
535 p_sys->p_info->sequence->width
536 * p_sys->p_info->sequence->height / 4 );
537 memset( p_pic->p[2].p_pixels, 0x80,
538 p_sys->p_info->sequence->width
539 * p_sys->p_info->sequence->height / 4 );
541 if( p_sys->b_slice_i )
543 vout_SynchroNewPicture( p_sys->p_synchro,
544 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
545 vout_SynchroDecode( p_sys->p_synchro );
546 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
560 /*****************************************************************************
561 * CloseDecoder: libmpeg2 decoder destruction
562 *****************************************************************************/
563 static void CloseDecoder( vlc_object_t *p_this )
565 decoder_t *p_dec = (decoder_t *)p_this;
566 decoder_sys_t *p_sys = p_dec->p_sys;
568 if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
570 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
575 /*****************************************************************************
576 * GetNewPicture: Get a new picture from the vout and set the buf struct
577 *****************************************************************************/
578 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
580 decoder_sys_t *p_sys = p_dec->p_sys;
583 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
584 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
585 p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
587 p_dec->fmt_out.i_codec =
588 ( p_sys->p_info->sequence->chroma_height <
589 p_sys->p_info->sequence->height ) ?
590 VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
592 /* Get a new picture */
593 p_pic = p_dec->pf_vout_buffer_new( p_dec );
595 if( p_pic == NULL ) return NULL;
597 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
598 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
599 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
600 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
601 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
602 p_sys->p_info->current_picture->nb_fields : 2;
604 p_dec->pf_picture_link( p_dec, p_pic );
606 pp_buf[0] = p_pic->p[0].p_pixels;
607 pp_buf[1] = p_pic->p[1].p_pixels;
608 pp_buf[2] = p_pic->p[2].p_pixels;