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
26 stream_timing_t *stream_timing;
31 uint8_t st_slots; // size (in slots) of stream_timing array
32 uint8_t saw_video; // != 0 if we've seen video
33 uint8_t saw_audio; // != 0 if we've seen audio
36 /***********************************************************************
38 **********************************************************************/
39 static void ReaderFunc( void * );
40 static hb_fifo_t ** GetFifoForId( hb_job_t * job, int id );
42 /***********************************************************************
44 ***********************************************************************
46 **********************************************************************/
47 hb_thread_t * hb_reader_init( hb_job_t * job )
51 r = calloc( sizeof( hb_reader_t ), 1 );
54 r->title = job->title;
59 r->stream_timing = calloc( sizeof(stream_timing_t), r->st_slots );
60 r->stream_timing[0].id = r->title->video_id;
61 r->stream_timing[0].average = 90000. * (double)job->vrate_base /
63 r->stream_timing[0].last = -r->stream_timing[0].average;
64 r->stream_timing[1].id = -1;
66 return hb_thread_init( "reader", ReaderFunc, r,
70 static void push_buf( const hb_reader_t *r, hb_fifo_t *fifo, hb_buffer_t *buf )
72 while( !*r->die && !r->job->done && hb_fifo_is_full( fifo ) )
75 * Loop until the incoming fifo is ready to receive
80 hb_fifo_push( fifo, buf );
83 static int is_audio( hb_reader_t *r, int id )
88 for( i = 0; ( audio = hb_list_item( r->title->list_audio, i ) ); ++i )
90 if ( audio->id == id )
98 // The MPEG STD (Standard Target Decoder) essentially requires that we keep
99 // per-stream timing so that when there's a timing discontinuity we can
100 // seemlessly join packets on either side of the discontinuity. This join
101 // requires that we know the timestamp of the previous packet and the
102 // average inter-packet time (since we position the new packet at the end
103 // of the previous packet). The next four routines keep track of this
104 // per-stream timing.
106 // find the per-stream timing state for 'buf'
108 static stream_timing_t *find_st( hb_reader_t *r, const hb_buffer_t *buf )
110 stream_timing_t *st = r->stream_timing;
111 for ( ; st->id != -1; ++st )
113 if ( st->id == buf->id )
119 // find or create the per-stream timing state for 'buf'
121 static stream_timing_t *id_to_st( hb_reader_t *r, const hb_buffer_t *buf )
123 stream_timing_t *st = r->stream_timing;
124 while ( st->id != buf->id && st->id != -1)
128 // if we haven't seen this stream add it.
131 // we keep the steam timing info in an array with some power-of-two
132 // number of slots. If we don't have two slots left (one for our new
133 // entry plus one for the "-1" eol) we need to expand the array.
134 int slot = st - r->stream_timing;
135 if ( slot + 1 >= r->st_slots )
138 r->stream_timing = realloc( r->stream_timing, r->st_slots *
139 sizeof(*r->stream_timing) );
140 st = r->stream_timing + slot;
143 st->average = 30.*90.;
144 st->last = buf->renderOffset - st->average;
145 if ( ( st->is_audio = is_audio( r, buf->id ) ) != 0 )
154 // update the average inter-packet time of the stream associated with 'buf'
155 // using a recursive low-pass filter with a 16 packet time constant.
157 static void update_ipt( hb_reader_t *r, const hb_buffer_t *buf )
159 stream_timing_t *st = id_to_st( r, buf );
160 double dt = buf->renderOffset - st->last;
161 st->average += ( dt - st->average ) * (1./32.);
162 st->last = buf->renderOffset;
165 // use the per-stream state associated with 'buf' to compute a new scr_offset
166 // such that 'buf' will follow the previous packet of this stream separated
167 // by the average packet time of the stream.
169 static void new_scr_offset( hb_reader_t *r, hb_buffer_t *buf )
171 stream_timing_t *st = id_to_st( r, buf );
172 int64_t nxt = st->last + st->average;
173 r->scr_offset = buf->renderOffset - nxt;
174 buf->renderOffset = nxt;
175 r->scr_changes = r->demux.scr_changes;
176 st->last = buf->renderOffset;
179 /***********************************************************************
181 ***********************************************************************
183 **********************************************************************/
184 static void ReaderFunc( void * _r )
186 hb_reader_t * r = _r;
192 int chapter_end = r->job->chapter_end;
194 if( !( r->dvd = hb_dvd_init( r->title->dvd ) ) )
196 if ( !( r->stream = hb_stream_open( r->title->dvd, r->title ) ) )
205 * XXX this code is a temporary hack that should go away if/when
206 * chapter merging goes away in libhb/dvd.c
207 * map the start and end chapter numbers to on-media chapter
208 * numbers since chapter merging could cause the handbrake numbers
209 * to diverge from the media numbers and, if our chapter_end is after
210 * a media chapter that got merged, we'll stop ripping too early.
212 int start = r->job->chapter_start;
213 hb_chapter_t *chap = hb_list_item( r->title->list_chapter, chapter_end - 1 );
215 chapter_end = chap->index;
218 chap = hb_list_item( r->title->list_chapter, start - 1 );
221 /* end chapter mapping XXX */
223 if( !hb_dvd_start( r->dvd, r->title->index, start ) )
225 hb_dvd_close( &r->dvd );
229 if ( r->job->start_at_preview )
231 // XXX code from DecodePreviews - should go into its own routine
232 hb_dvd_seek( r->dvd, (float)r->job->start_at_preview /
233 ( r->job->seek_points ? ( r->job->seek_points + 1.0 ) : 11.0 ) );
236 else if ( r->stream && r->job->start_at_preview )
239 // XXX code from DecodePreviews - should go into its own routine
240 hb_stream_seek( r->stream, (float)( r->job->start_at_preview - 1 ) /
241 ( r->job->seek_points ? ( r->job->seek_points + 1.0 ) : 11.0 ) );
247 * Standard stream, seek to the starting chapter, if set, and track the
248 * end chapter so that we end at the right time.
250 int start = r->job->chapter_start;
251 hb_chapter_t *chap = hb_list_item( r->title->list_chapter, chapter_end - 1 );
253 chapter_end = chap->index;
256 chap = hb_list_item( r->title->list_chapter, start - 1 );
261 * Seek to the start chapter.
263 hb_stream_seek_chapter( r->stream, start );
266 list = hb_list_init();
267 hb_buffer_t *ps = hb_buffer_init( HB_DVD_READ_BUFFER_SIZE );
269 while( !*r->die && !r->job->done )
272 chapter = hb_dvd_chapter( r->dvd );
274 chapter = hb_stream_chapter( r->stream );
278 hb_log( "reader: end of the title reached" );
281 if( chapter > chapter_end )
283 hb_log( "reader: end of chapter %d (media %d) reached at media chapter %d",
284 r->job->chapter_end, chapter_end, chapter );
290 if( !hb_dvd_read( r->dvd, ps ) )
297 if ( !hb_stream_read( r->stream, ps ) )
303 if( r->job->indepth_scan )
306 * Need to update the progress during a subtitle scan
310 #define p state.param.working
312 state.state = HB_STATE_WORKING;
313 p.progress = (double)chapter / (double)r->job->chapter_end;
314 if( p.progress > 1.0 )
322 hb_set_state( r->job->h, &state );
325 (hb_demux[r->title->demuxer])( ps, list, &r->demux );
327 while( ( buf = hb_list_item( list, 0 ) ) )
329 hb_list_rem( list, buf );
330 fifos = GetFifoForId( r->job, buf->id );
332 if ( ! r->saw_video )
334 /* The first video packet defines 'time zero' so discard
335 data until we get a video packet with a PTS & DTS */
336 if ( buf->id == r->title->video_id && buf->start != -1 &&
337 buf->renderOffset != -1 )
339 // force a new scr offset computation
340 r->scr_changes = r->demux.scr_changes - 1;
342 hb_log( "reader: first SCR %lld", r->demux.last_scr );
351 if ( buf->renderOffset != -1 )
353 if ( r->scr_changes == r->demux.scr_changes )
355 // This packet is referenced to the same SCR as the last.
356 // Adjust timestamp to remove the System Clock Reference
357 // offset then update the average inter-packet time
359 buf->renderOffset -= r->scr_offset;
360 update_ipt( r, buf );
364 // This is the first audio or video packet after an SCR
365 // change. Compute a new scr offset that would make this
366 // packet follow the last of this stream with the correct
368 stream_timing_t *st = find_st( r, buf );
372 // if this is the video stream and we don't have
373 // audio yet or this is an audio stream
374 // generate a new scr
376 ( st == r->stream_timing && !r->saw_audio ) )
378 new_scr_offset( r, buf );
382 // defer the scr change until we get some
383 // audio since audio has a timestamp per
384 // frame but video & subtitles don't. Clear
385 // the timestamps so the decoder will generate
386 // them from the frame durations.
387 if ( st != r->stream_timing )
389 // not a video stream so it's probably
390 // subtitles - the best we can do is to
391 // line it up with the last video packet.
392 buf->start = r->stream_timing->last;
397 buf->renderOffset = -1;
403 // we got a new scr at the same time as the first
404 // packet of a stream we've never seen before. We
405 // have no idea what the timing should be so toss
406 // this buffer & wait for a stream we've already seen.
407 hb_buffer_close( &buf );
412 if ( buf->start != -1 )
414 buf->start -= r->scr_offset;
415 if ( r->job->pts_to_stop && buf->start > r->job->pts_to_stop )
417 // we're doing a subset of the input and we've hit the
419 hb_buffer_close( &buf );
424 buf->sequence = r->sequence++;
425 /* if there are mutiple output fifos, send a copy of the
426 * buffer down all but the first (we have to not ship the
427 * original buffer or we'll race with the thread that's
428 * consuming the buffer & inject garbage into the data stream). */
429 for( n = 1; fifos[n] != NULL; n++)
431 hb_buffer_t *buf_copy = hb_buffer_init( buf->size );
432 hb_buffer_copy_settings( buf_copy, buf );
433 memcpy( buf_copy->data, buf->data, buf->size );
434 push_buf( r, fifos[n], buf_copy );
436 push_buf( r, fifos[0], buf );
440 hb_buffer_close( &buf );
446 // send empty buffers downstream to video & audio decoders to signal we're done.
447 push_buf( r, r->job->fifo_mpeg2, hb_buffer_init(0) );
450 for( n = 0; ( audio = hb_list_item( r->job->title->list_audio, n ) ); ++n )
452 if ( audio->priv.fifo_in )
453 push_buf( r, audio->priv.fifo_in, hb_buffer_init(0) );
456 hb_list_empty( &list );
457 hb_buffer_close( &ps );
460 hb_dvd_stop( r->dvd );
461 hb_dvd_close( &r->dvd );
465 hb_stream_close(&r->stream);
468 if ( r->stream_timing )
470 free( r->stream_timing );
473 hb_log( "reader: done. %d scr changes", r->demux.scr_changes );
474 if ( r->demux.dts_drops )
476 hb_log( "reader: %d drops because DTS out of range", r->demux.dts_drops );
483 /***********************************************************************
485 ***********************************************************************
487 **********************************************************************/
488 static hb_fifo_t ** GetFifoForId( hb_job_t * job, int id )
490 hb_title_t * title = job->title;
492 hb_subtitle_t * subtitle;
494 static hb_fifo_t * fifos[8];
496 memset(fifos, 0, sizeof(fifos));
498 if( id == title->video_id )
500 if( job->indepth_scan )
503 * Ditch the video here during the indepth scan until
504 * we can improve the MPEG2 decode performance.
510 fifos[0] = job->fifo_mpeg2;
515 if( job->indepth_scan ) {
517 * Count the occurances of the subtitles, don't actually
518 * return any to encode unless we are looking fro forced
519 * subtitles in which case we need to look in the sub picture
520 * to see if it has the forced flag enabled.
522 for (i=0; i < hb_list_count(title->list_subtitle); i++) {
523 subtitle = hb_list_item( title->list_subtitle, i);
524 if (id == subtitle->id) {
529 if( job->subtitle_force )
532 fifos[0] = subtitle->fifo_in;
539 if( ( subtitle = hb_list_item( title->list_subtitle, 0 ) ) &&
542 fifos[0] = subtitle->fifo_in;
546 if( !job->indepth_scan )
549 for( i = 0; i < hb_list_count( title->list_audio ); i++ )
551 audio = hb_list_item( title->list_audio, i );
552 if( id == audio->id )
554 fifos[n++] = audio->priv.fifo_in;