1 /* $Id: reader.c,v 1.21 2005/11/25 15:05:25 titer Exp $
3 This file is part of the HandBrake source code.
4 Homepage: <http://handbrake.fr/>.
5 It may be used under the terms of the GNU General Public License. */
11 double average; // average time between packets
12 int64_t last; // last timestamp seen on this stream
14 int is_audio; // != 0 if this is an audio stream
15 int valid; // Stream timing is not valid until next scr.
28 stream_timing_t *stream_timing;
33 uint8_t st_slots; // size (in slots) of stream_timing array
34 uint8_t saw_video; // != 0 if we've seen video
35 uint8_t saw_audio; // != 0 if we've seen audio
37 int start_found; // found pts_to_start point
41 /***********************************************************************
43 **********************************************************************/
44 static void ReaderFunc( void * );
45 static hb_fifo_t ** GetFifoForId( hb_job_t * job, int id );
46 static void UpdateState( hb_reader_t * r, int64_t start);
48 /***********************************************************************
50 ***********************************************************************
52 **********************************************************************/
53 hb_thread_t * hb_reader_init( hb_job_t * job )
57 r = calloc( sizeof( hb_reader_t ), 1 );
60 r->title = job->title;
65 r->stream_timing = calloc( sizeof(stream_timing_t), r->st_slots );
66 r->stream_timing[0].id = r->title->video_id;
67 r->stream_timing[0].average = 90000. * (double)job->vrate_base /
69 r->stream_timing[0].last = -r->stream_timing[0].average;
70 r->stream_timing[0].valid = 1;
71 r->stream_timing[1].id = -1;
73 if ( !job->pts_to_start )
76 return hb_thread_init( "reader", ReaderFunc, r,
80 static void push_buf( const hb_reader_t *r, hb_fifo_t *fifo, hb_buffer_t *buf )
82 while ( !*r->die && !r->job->done )
84 if ( hb_fifo_full_wait( fifo ) )
86 hb_fifo_push( fifo, buf );
93 hb_buffer_close( &buf );
97 static int is_audio( hb_reader_t *r, int id )
102 for( i = 0; ( audio = hb_list_item( r->title->list_audio, i ) ); ++i )
104 if ( audio->id == id )
112 // The MPEG STD (Standard Target Decoder) essentially requires that we keep
113 // per-stream timing so that when there's a timing discontinuity we can
114 // seemlessly join packets on either side of the discontinuity. This join
115 // requires that we know the timestamp of the previous packet and the
116 // average inter-packet time (since we position the new packet at the end
117 // of the previous packet). The next four routines keep track of this
118 // per-stream timing.
120 // find the per-stream timing state for 'buf'
122 static stream_timing_t *find_st( hb_reader_t *r, const hb_buffer_t *buf )
124 stream_timing_t *st = r->stream_timing;
125 for ( ; st->id != -1; ++st )
127 if ( st->id == buf->id )
133 // find or create the per-stream timing state for 'buf'
135 static stream_timing_t *id_to_st( hb_reader_t *r, const hb_buffer_t *buf, int valid )
137 stream_timing_t *st = r->stream_timing;
138 while ( st->id != buf->id && st->id != -1)
142 // if we haven't seen this stream add it.
145 // we keep the steam timing info in an array with some power-of-two
146 // number of slots. If we don't have two slots left (one for our new
147 // entry plus one for the "-1" eol) we need to expand the array.
148 int slot = st - r->stream_timing;
149 if ( slot + 1 >= r->st_slots )
152 r->stream_timing = realloc( r->stream_timing, r->st_slots *
153 sizeof(*r->stream_timing) );
154 st = r->stream_timing + slot;
157 st->average = 30.*90.;
158 st->last = -st->average;
159 if ( ( st->is_audio = is_audio( r, buf->id ) ) != 0 )
169 // update the average inter-packet time of the stream associated with 'buf'
170 // using a recursive low-pass filter with a 16 packet time constant.
172 static void update_ipt( hb_reader_t *r, const hb_buffer_t *buf )
174 stream_timing_t *st = id_to_st( r, buf, 1 );
175 double dt = buf->renderOffset - st->last;
176 // Protect against spurious bad timestamps
177 if ( dt > -5 * 90000LL && dt < 5 * 90000LL )
179 st->average += ( dt - st->average ) * (1./32.);
180 st->last = buf->renderOffset;
185 // use the per-stream state associated with 'buf' to compute a new scr_offset
186 // such that 'buf' will follow the previous packet of this stream separated
187 // by the average packet time of the stream.
189 static void new_scr_offset( hb_reader_t *r, hb_buffer_t *buf )
191 stream_timing_t *st = id_to_st( r, buf, 1 );
195 // !valid means we've not received any previous data
196 // for this stream. There is no 'last' packet time.
197 // So approximate it with video's last time.
198 last = r->stream_timing[0].last;
205 int64_t nxt = last + st->average;
206 r->scr_offset = buf->renderOffset - nxt;
207 // This log is handy when you need to debug timing problems...
208 //hb_log("id %x last %ld avg %g nxt %ld renderOffset %ld scr_offset %ld",
209 // buf->id, last, st->average, nxt, buf->renderOffset, r->scr_offset);
210 r->scr_changes = r->demux.scr_changes;
214 /***********************************************************************
216 ***********************************************************************
218 **********************************************************************/
219 static void ReaderFunc( void * _r )
221 hb_reader_t * r = _r;
227 int chapter_end = r->job->chapter_end;
229 if ( r->title->type == HB_BD_TYPE )
231 if ( !( r->bd = hb_bd_init( r->title->path ) ) )
234 else if ( r->title->type == HB_DVD_TYPE )
236 if ( !( r->dvd = hb_dvd_init( r->title->path ) ) )
239 else if ( r->title->type == HB_STREAM_TYPE )
241 if ( !( r->stream = hb_stream_open( r->title->path, r->title ) ) )
246 // Unknown type, should never happen
250 hb_buffer_t *ps = hb_buffer_init( HB_DVD_READ_BUFFER_SIZE );
253 if( !hb_bd_start( r->bd, r->title ) )
255 hb_bd_close( &r->bd );
256 hb_buffer_close( &ps );
259 if ( r->job->start_at_preview )
261 // XXX code from DecodePreviews - should go into its own routine
262 hb_bd_seek( r->bd, (float)r->job->start_at_preview /
263 ( r->job->seek_points ? ( r->job->seek_points + 1.0 ) : 11.0 ) );
265 else if ( r->job->pts_to_start )
267 hb_bd_seek_pts( r->bd, r->job->pts_to_start );
268 r->job->pts_to_start = 0;
273 hb_bd_seek_chapter( r->bd, r->job->chapter_start );
275 if (r->job->angle > 1)
277 hb_bd_set_angle( r->bd, r->job->angle - 1 );
283 * XXX this code is a temporary hack that should go away if/when
284 * chapter merging goes away in libhb/dvd.c
285 * map the start and end chapter numbers to on-media chapter
286 * numbers since chapter merging could cause the handbrake numbers
287 * to diverge from the media numbers and, if our chapter_end is after
288 * a media chapter that got merged, we'll stop ripping too early.
290 int start = r->job->chapter_start;
291 hb_chapter_t *chap = hb_list_item( r->title->list_chapter, chapter_end - 1 );
293 chapter_end = chap->index;
296 chap = hb_list_item( r->title->list_chapter, start - 1 );
299 /* end chapter mapping XXX */
301 if( !hb_dvd_start( r->dvd, r->title, start ) )
303 hb_dvd_close( &r->dvd );
304 hb_buffer_close( &ps );
309 hb_dvd_set_angle( r->dvd, r->job->angle );
312 if ( r->job->start_at_preview )
314 // XXX code from DecodePreviews - should go into its own routine
315 hb_dvd_seek( r->dvd, (float)r->job->start_at_preview /
316 ( r->job->seek_points ? ( r->job->seek_points + 1.0 ) : 11.0 ) );
319 else if ( r->stream && r->job->start_at_preview )
322 // XXX code from DecodePreviews - should go into its own routine
323 hb_stream_seek( r->stream, (float)( r->job->start_at_preview - 1 ) /
324 ( r->job->seek_points ? ( r->job->seek_points + 1.0 ) : 11.0 ) );
327 else if ( r->stream && r->job->pts_to_start )
329 int64_t pts_to_start = r->job->pts_to_start;
331 // Find out what the first timestamp of the stream is
332 // and then seek to the appropriate offset from it
333 if ( hb_stream_read( r->stream, ps ) )
336 pts_to_start += ps->start;
339 if ( hb_stream_seek_ts( r->stream, pts_to_start ) >= 0 )
341 // Seek takes us to the nearest I-frame before the timestamp
342 // that we want. So we will retrieve the start time of the
343 // first packet we get, subtract that from pts_to_start, and
344 // inspect the reset of the frames in sync.
346 r->job->pts_to_start = pts_to_start;
352 * Standard stream, seek to the starting chapter, if set, and track the
353 * end chapter so that we end at the right time.
355 int start = r->job->chapter_start;
356 hb_chapter_t *chap = hb_list_item( r->title->list_chapter, chapter_end - 1 );
358 chapter_end = chap->index;
361 chap = hb_list_item( r->title->list_chapter, start - 1 );
366 * Seek to the start chapter.
368 hb_stream_seek_chapter( r->stream, start );
371 list = hb_list_init();
373 while( !*r->die && !r->job->done )
376 chapter = hb_bd_chapter( r->bd );
378 chapter = hb_dvd_chapter( r->dvd );
380 chapter = hb_stream_chapter( r->stream );
384 hb_log( "reader: end of the title reached" );
387 if( chapter > chapter_end )
389 hb_log( "reader: end of chapter %d (media %d) reached at media chapter %d",
390 r->job->chapter_end, chapter_end, chapter );
396 if( !hb_bd_read( r->bd, ps ) )
403 if( !hb_dvd_read( r->dvd, ps ) )
410 if ( !hb_stream_read( r->stream, ps ) )
414 if ( r->start_found == 2 )
416 // We will inspect the timestamps of each frame in sync
417 // to skip from this seek point to the timestamp we
419 if ( ps->start > 0 && ps->start < r->job->pts_to_start )
421 r->job->pts_to_start -= ps->start;
423 else if ( ps->start >= r->job->pts_to_start )
425 r->job->pts_to_start = 0;
431 if( r->job->indepth_scan )
434 * Need to update the progress during a subtitle scan
438 #define p state.param.working
440 state.state = HB_STATE_WORKING;
441 p.progress = (double)chapter / (double)r->job->chapter_end;
442 if( p.progress > 1.0 )
450 hb_set_state( r->job->h, &state );
453 (hb_demux[r->title->demuxer])( ps, list, &r->demux );
455 while( ( buf = hb_list_item( list, 0 ) ) )
457 hb_list_rem( list, buf );
458 fifos = GetFifoForId( r->job, buf->id );
460 if ( fifos && ! r->saw_video && !r->job->indepth_scan )
462 // The first data packet with a PTS from an audio or video stream
463 // that we're decoding defines 'time zero'. Discard packets until
465 if ( buf->start != -1 && buf->renderOffset != -1 &&
466 ( buf->id == r->title->video_id || is_audio( r, buf->id ) ) )
468 // force a new scr offset computation
469 r->scr_changes = r->demux.scr_changes - 1;
470 // create a stream state if we don't have one so the
471 // offset will get computed correctly.
472 id_to_st( r, buf, 1 );
474 hb_log( "reader: first SCR %"PRId64" id %d DTS %"PRId64,
475 r->demux.last_scr, buf->id, buf->renderOffset );
484 if ( buf->renderOffset != -1 )
486 if ( r->scr_changes != r->demux.scr_changes )
488 // This is the first audio or video packet after an SCR
489 // change. Compute a new scr offset that would make this
490 // packet follow the last of this stream with the
491 // correct average spacing.
492 stream_timing_t *st = id_to_st( r, buf, 0 );
494 // if this is the video stream and we don't have
495 // audio yet or this is an audio stream
496 // generate a new scr
498 ( st == r->stream_timing && !r->saw_audio ) )
500 new_scr_offset( r, buf );
504 // defer the scr change until we get some
505 // audio since audio has a timestamp per
506 // frame but video & subtitles don't. Clear
507 // the timestamps so the decoder will generate
508 // them from the frame durations.
510 buf->renderOffset = -1;
514 if ( buf->start != -1 )
516 int64_t start = buf->start - r->scr_offset;
517 if ( !r->start_found )
518 UpdateState( r, start );
520 if ( !r->start_found &&
521 start >= r->job->pts_to_start )
523 // pts_to_start point found
526 // This log is handy when you need to debug timing problems
527 //hb_log("id %x scr_offset %ld start %ld --> %ld",
528 // buf->id, r->scr_offset, buf->start,
529 // buf->start - r->scr_offset);
530 buf->start -= r->scr_offset;
532 if ( buf->renderOffset != -1 )
534 if ( r->scr_changes == r->demux.scr_changes )
536 // This packet is referenced to the same SCR as the last.
537 // Adjust timestamp to remove the System Clock Reference
538 // offset then update the average inter-packet time
540 buf->renderOffset -= r->scr_offset;
541 update_ipt( r, buf );
544 if ( !r->start_found )
546 hb_buffer_close( &buf );
550 buf->sequence = r->sequence++;
551 /* if there are mutiple output fifos, send a copy of the
552 * buffer down all but the first (we have to not ship the
553 * original buffer or we'll race with the thread that's
554 * consuming the buffer & inject garbage into the data stream). */
555 for( n = 1; fifos[n] != NULL; n++)
557 hb_buffer_t *buf_copy = hb_buffer_init( buf->size );
558 hb_buffer_copy_settings( buf_copy, buf );
559 memcpy( buf_copy->data, buf->data, buf->size );
560 push_buf( r, fifos[n], buf_copy );
562 push_buf( r, fifos[0], buf );
566 hb_buffer_close( &buf );
571 // send empty buffers downstream to video & audio decoders to signal we're done.
572 if( !*r->die && !r->job->done )
574 push_buf( r, r->job->fifo_mpeg2, hb_buffer_init(0) );
577 for( n = 0; (audio = hb_list_item( r->job->title->list_audio, n)); ++n )
579 if ( audio->priv.fifo_in )
580 push_buf( r, audio->priv.fifo_in, hb_buffer_init(0) );
583 hb_subtitle_t *subtitle;
584 for( n = 0; (subtitle = hb_list_item( r->job->title->list_subtitle, n)); ++n )
586 if ( subtitle->fifo_in && subtitle->source == VOBSUB)
587 push_buf( r, subtitle->fifo_in, hb_buffer_init(0) );
591 hb_list_empty( &list );
592 hb_buffer_close( &ps );
596 hb_bd_close( &r->bd );
600 hb_dvd_stop( r->dvd );
601 hb_dvd_close( &r->dvd );
605 hb_stream_close(&r->stream);
608 if ( r->stream_timing )
610 free( r->stream_timing );
613 hb_log( "reader: done. %d scr changes", r->demux.scr_changes );
614 if ( r->demux.dts_drops )
616 hb_log( "reader: %d drops because DTS out of range", r->demux.dts_drops );
623 static void UpdateState( hb_reader_t * r, int64_t start)
635 #define p state.param.working
636 state.state = HB_STATE_SEARCHING;
637 p.progress = (float) start / (float) r->job->pts_to_start;
638 if( p.progress > 1.0 )
642 if (now > r->st_first)
646 avg = 1000.0 * (double)start / (now - r->st_first);
647 eta = ( r->job->pts_to_start - start ) / avg;
648 p.hours = eta / 3600;
649 p.minutes = ( eta % 3600 ) / 60;
650 p.seconds = eta % 60;
661 hb_set_state( r->job->h, &state );
663 /***********************************************************************
665 ***********************************************************************
667 **********************************************************************/
668 static hb_fifo_t ** GetFifoForId( hb_job_t * job, int id )
670 hb_title_t * title = job->title;
672 hb_subtitle_t * subtitle;
674 static hb_fifo_t * fifos[100];
676 memset(fifos, 0, sizeof(fifos));
678 if( id == title->video_id )
680 if( job->indepth_scan )
683 * Ditch the video here during the indepth scan until
684 * we can improve the MPEG2 decode performance.
690 fifos[0] = job->fifo_mpeg2;
696 count = hb_list_count( title->list_subtitle );
697 count = count > 99 ? 99 : count;
698 for( i=0; i < count; i++ ) {
699 subtitle = hb_list_item( title->list_subtitle, i );
700 if (id == subtitle->id) {
702 if( !job->indepth_scan || job->select_subtitle_config.force )
705 * Pass the subtitles to be processed if we are not scanning, or if
706 * we are scanning and looking for forced subs, then pass them up
707 * to decode whether the sub is a forced one.
709 fifos[n++] = subtitle->fifo_in;
718 if( !job->indepth_scan )
721 for( i = 0; i < hb_list_count( title->list_audio ); i++ )
723 audio = hb_list_item( title->list_audio, i );
724 if( id == audio->id )
726 fifos[n++] = audio->priv.fifo_in;