1 /*****************************************************************************
2 * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
3 *****************************************************************************
4 * Copyright (C) 1999-2001 VideoLAN
5 * $Id: libmpeg2.c,v 1.41 2003/12/24 09:46:08 gbazin Exp $
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;
57 pes_packet_t *p_pes; /* current PES we are decoding */
59 mtime_t i_previous_pts;
60 mtime_t i_current_pts;
62 picture_t * p_picture_to_destroy;
63 vlc_bool_t b_garbage_pic;
64 vlc_bool_t b_after_sequence_header; /* is it the next frame after
65 * the sequence header ? */
66 vlc_bool_t b_slice_i; /* intra-slice refresh stream */
71 vout_synchro_t *p_synchro;
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;
104 if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','v') &&
105 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
106 /* Pinnacle hardware-mpeg1 */
107 p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
109 p_dec->fmt_in.i_codec != VLC_FOURCC('V','C','R','2') &&
110 p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') )
115 /* Allocate the memory needed to store the decoder's structure */
116 if( ( p_dec->p_sys = p_sys =
117 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
119 msg_Err( p_dec, "out of memory" );
123 /* Initialize the thread properties */
124 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 /* Initialize decoder */
138 p_sys->p_mpeg2dec = mpeg2_init();
139 if( p_sys->p_mpeg2dec == NULL)
141 msg_Err( p_dec, "mpeg2_init() failed" );
146 p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
148 p_dec->pf_decode_video = DecodeBlock;
153 /*****************************************************************************
154 * RunDecoder: the libmpeg2 decoder
155 *****************************************************************************/
156 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
158 decoder_sys_t *p_sys = p_dec->p_sys;
164 if( !pp_block || !*pp_block ) return NULL;
170 state = mpeg2_parse( p_sys->p_mpeg2dec );
175 if( !p_block->i_buffer )
177 block_Release( p_block );
181 if( p_block->b_discontinuity && p_sys->p_synchro &&
182 p_sys->p_info->sequence &&
183 p_sys->p_info->sequence->width != (unsigned)-1 )
185 vout_SynchroReset( p_sys->p_synchro );
186 if( p_sys->p_info->current_fbuf != NULL
187 && p_sys->p_info->current_fbuf->id != NULL )
189 p_sys->b_garbage_pic = 1;
190 p_pic = p_sys->p_info->current_fbuf->id;
195 buf[0] = buf[1] = buf[2] = NULL;
196 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
198 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
200 p_sys->p_picture_to_destroy = p_pic;
202 if ( p_sys->b_slice_i )
204 vout_SynchroNewPicture( p_sys->p_synchro,
205 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
206 vout_SynchroDecode( p_sys->p_synchro );
207 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
214 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
216 #else /* New interface */
217 mpeg2_tag_picture( p_sys->p_mpeg2dec,
218 (uint32_t)p_block->i_pts, 0/*dts*/ );
220 p_sys->i_previous_pts = p_sys->i_current_pts;
221 p_sys->i_current_pts = p_block->i_pts;
224 p_sys->i_current_rate = p_block->i_rate;
226 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
227 p_block->p_buffer + p_block->i_buffer );
229 p_block->i_buffer = 0;
234 /* Initialize video output */
236 buf[0] = buf[1] = buf[2] = NULL;
238 /* Check whether the input gave a particular aspect ratio */
239 if( p_dec->fmt_in.video.i_aspect )
241 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
242 if( p_sys->i_aspect <= AR_221_1_PICTURE )
243 switch( p_sys->i_aspect )
246 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
248 case AR_16_9_PICTURE:
249 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
251 case AR_221_1_PICTURE:
252 p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
254 case AR_SQUARE_PICTURE:
255 p_sys->i_aspect = VOUT_ASPECT_FACTOR *
256 p_sys->p_info->sequence->width /
257 p_sys->p_info->sequence->height;
263 /* Use the value provided in the MPEG sequence header */
265 ((uint64_t)p_sys->p_info->sequence->display_width) *
266 p_sys->p_info->sequence->pixel_width * VOUT_ASPECT_FACTOR /
267 p_sys->p_info->sequence->display_height /
268 p_sys->p_info->sequence->pixel_height;
271 msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
272 p_sys->p_info->sequence->width,
273 p_sys->p_info->sequence->height, p_sys->i_aspect,
274 (uint32_t)((uint64_t)1001000000 * 27 /
275 p_sys->p_info->sequence->frame_period / 1001),
276 (uint32_t)((uint64_t)1001000000 * 27 /
277 p_sys->p_info->sequence->frame_period % 1001) );
279 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
281 /* Set the first 2 reference frames */
282 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
284 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
286 block_Release( p_block );
290 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
292 /* This picture will never go through display_picture. */
295 /* For some reason, libmpeg2 will put this pic twice in
296 * discard_picture. This can be considered a bug in libmpeg2. */
297 p_dec->pf_picture_link( p_dec, p_pic );
299 if( p_sys->p_synchro )
301 vout_SynchroRelease( p_sys->p_synchro );
303 p_sys->p_synchro = vout_SynchroInit( p_dec,
304 (uint32_t)((uint64_t)1001000000 * 27 /
305 p_sys->p_info->sequence->frame_period) );
306 p_sys->b_after_sequence_header = 1;
310 case STATE_PICTURE_2ND:
311 vout_SynchroNewPicture( p_sys->p_synchro,
312 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
313 p_sys->p_info->current_picture->nb_fields,
314 0, 0, p_sys->i_current_rate );
318 vout_SynchroTrash( p_sys->p_synchro );
322 vout_SynchroDecode( p_sys->p_synchro );
330 buf[0] = buf[1] = buf[2] = NULL;
332 if ( p_sys->b_after_sequence_header &&
333 ((p_sys->p_info->current_picture->flags &
334 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
336 /* Intra-slice refresh. Simulate a blank I picture. */
337 msg_Dbg( p_dec, "intra-slice refresh stream" );
338 vout_SynchroNewPicture( p_sys->p_synchro,
339 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
340 vout_SynchroDecode( p_sys->p_synchro );
341 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
342 p_sys->b_slice_i = 1;
344 p_sys->b_after_sequence_header = 0;
347 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
348 ( ( p_sys->p_info->current_picture->pts ==
349 (uint32_t)p_sys->i_current_pts ) ?
350 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
352 #else /* New interface */
354 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
355 ( ( p_sys->p_info->current_picture->tag ==
356 (uint32_t)p_sys->i_current_pts ) ?
357 p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
360 /* Hack to handle demuxers which only have DTS timestamps */
361 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
363 if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
364 (p_sys->p_info->current_picture->flags &
365 PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
367 i_pts = p_block->i_dts;
370 p_block->i_pts = p_block->i_dts = 0;
373 vout_SynchroNewPicture( p_sys->p_synchro,
374 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
375 p_sys->p_info->current_picture->nb_fields, i_pts,
376 0, p_sys->i_current_rate );
378 if ( !(p_sys->b_slice_i
379 && ((p_sys->p_info->current_picture->flags
380 & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
381 && !vout_SynchroChoose( p_sys->p_synchro,
382 p_sys->p_info->current_picture->flags
383 & PIC_MASK_CODING_TYPE,
384 /*p_sys->p_vout->render_time*/ 0 /*FIXME*/ ) )
386 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
388 vout_SynchroTrash( p_sys->p_synchro );
389 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
393 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
395 vout_SynchroDecode( p_sys->p_synchro );
397 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
399 block_Release( p_block );
403 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
411 if( p_sys->p_info->display_fbuf
412 && p_sys->p_info->display_fbuf->id )
414 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
416 vout_SynchroEnd( p_sys->p_synchro,
417 p_sys->p_info->display_picture->flags
418 & PIC_MASK_CODING_TYPE,
419 p_sys->b_garbage_pic );
420 p_sys->b_garbage_pic = 0;
422 if ( p_sys->p_picture_to_destroy != p_pic )
424 p_pic->date = vout_SynchroDate( p_sys->p_synchro );
428 p_sys->p_picture_to_destroy = NULL;
433 if( p_sys->p_info->discard_fbuf &&
434 p_sys->p_info->discard_fbuf->id )
436 p_dec->pf_picture_unlink( p_dec,
437 p_sys->p_info->discard_fbuf->id );
440 if( p_pic ) return p_pic;
447 buf[0] = buf[1] = buf[2] = NULL;
449 msg_Warn( p_dec, "invalid picture encountered" );
450 if ( ( p_sys->p_info->current_picture == NULL ) ||
451 ( ( p_sys->p_info->current_picture->flags &
452 PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
454 if( p_sys->p_synchro ) vout_SynchroReset( p_sys->p_synchro );
456 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
459 if( p_sys->p_info->current_fbuf &&
460 p_sys->p_info->current_fbuf->id )
462 p_sys->b_garbage_pic = 1;
463 p_pic = p_sys->p_info->current_fbuf->id;
465 else if( !p_sys->p_info->sequence )
471 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
473 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
475 p_sys->p_picture_to_destroy = p_pic;
477 memset( p_pic->p[0].p_pixels, 0,
478 p_sys->p_info->sequence->width
479 * p_sys->p_info->sequence->height );
480 memset( p_pic->p[1].p_pixels, 0x80,
481 p_sys->p_info->sequence->width
482 * p_sys->p_info->sequence->height / 4 );
483 memset( p_pic->p[2].p_pixels, 0x80,
484 p_sys->p_info->sequence->width
485 * p_sys->p_info->sequence->height / 4 );
487 if( p_sys->b_slice_i )
489 vout_SynchroNewPicture( p_sys->p_synchro,
490 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
491 vout_SynchroDecode( p_sys->p_synchro );
492 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
506 /*****************************************************************************
507 * CloseDecoder: libmpeg2 decoder destruction
508 *****************************************************************************/
509 static void CloseDecoder( vlc_object_t *p_this )
511 decoder_t *p_dec = (decoder_t *)p_this;
512 decoder_sys_t *p_sys = p_dec->p_sys;
514 if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
516 if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
521 /*****************************************************************************
522 * GetNewPicture: Get a new picture from the vout and set the buf struct
523 *****************************************************************************/
524 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
526 decoder_sys_t *p_sys = p_dec->p_sys;
529 p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
530 p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
531 p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
533 p_dec->fmt_out.i_codec =
534 ( p_sys->p_info->sequence->chroma_height <
535 p_sys->p_info->sequence->height ) ?
536 VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
538 /* Get a new picture */
539 p_pic = p_dec->pf_vout_buffer_new( p_dec );
541 if( p_pic == NULL ) return NULL;
543 p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
544 p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
545 p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
546 p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
547 p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
548 p_sys->p_info->current_picture->nb_fields : 2;
550 p_dec->pf_picture_link( p_dec, p_pic );
552 pp_buf[0] = p_pic->p[0].p_pixels;
553 pp_buf[1] = p_pic->p[1].p_pixels;
554 pp_buf[2] = p_pic->p[2].p_pixels;