/* $Id: reader.c,v 1.21 2005/11/25 15:05:25 titer Exp $ This file is part of the HandBrake source code. Homepage: . It may be used under the terms of the GNU General Public License. */ #include "hb.h" typedef struct { double average; // average time between packets int64_t last; // last timestamp seen on this stream int id; // stream id int is_audio; // != 0 if this is an audio stream } stream_timing_t; typedef struct { hb_job_t * job; hb_title_t * title; volatile int * die; hb_dvd_t * dvd; hb_stream_t * stream; stream_timing_t *stream_timing; int64_t scr_offset; hb_psdemux_t demux; int scr_changes; uint32_t sequence; uint8_t st_slots; // size (in slots) of stream_timing array uint8_t saw_video; // != 0 if we've seen video uint8_t saw_audio; // != 0 if we've seen audio } hb_reader_t; /*********************************************************************** * Local prototypes **********************************************************************/ static void ReaderFunc( void * ); static hb_fifo_t ** GetFifoForId( hb_job_t * job, int id ); /*********************************************************************** * hb_reader_init *********************************************************************** * **********************************************************************/ hb_thread_t * hb_reader_init( hb_job_t * job ) { hb_reader_t * r; r = calloc( sizeof( hb_reader_t ), 1 ); r->job = job; r->title = job->title; r->die = job->die; r->sequence = 0; r->st_slots = 4; r->stream_timing = calloc( sizeof(stream_timing_t), r->st_slots ); r->stream_timing[0].id = r->title->video_id; r->stream_timing[0].average = 90000. * (double)job->vrate_base / (double)job->vrate; r->stream_timing[0].last = -r->stream_timing[0].average; r->stream_timing[1].id = -1; return hb_thread_init( "reader", ReaderFunc, r, HB_NORMAL_PRIORITY ); } static void push_buf( const hb_reader_t *r, hb_fifo_t *fifo, hb_buffer_t *buf ) { hb_fifo_push_wait( fifo, buf ); } static int is_audio( hb_reader_t *r, int id ) { int i; hb_audio_t *audio; for( i = 0; ( audio = hb_list_item( r->title->list_audio, i ) ); ++i ) { if ( audio->id == id ) { return 1; } } return 0; } // The MPEG STD (Standard Target Decoder) essentially requires that we keep // per-stream timing so that when there's a timing discontinuity we can // seemlessly join packets on either side of the discontinuity. This join // requires that we know the timestamp of the previous packet and the // average inter-packet time (since we position the new packet at the end // of the previous packet). The next four routines keep track of this // per-stream timing. // find the per-stream timing state for 'buf' static stream_timing_t *find_st( hb_reader_t *r, const hb_buffer_t *buf ) { stream_timing_t *st = r->stream_timing; for ( ; st->id != -1; ++st ) { if ( st->id == buf->id ) return st; } return NULL; } // find or create the per-stream timing state for 'buf' static stream_timing_t *id_to_st( hb_reader_t *r, const hb_buffer_t *buf ) { stream_timing_t *st = r->stream_timing; while ( st->id != buf->id && st->id != -1) { ++st; } // if we haven't seen this stream add it. if ( st->id == -1 ) { // we keep the steam timing info in an array with some power-of-two // number of slots. If we don't have two slots left (one for our new // entry plus one for the "-1" eol) we need to expand the array. int slot = st - r->stream_timing; if ( slot + 1 >= r->st_slots ) { r->st_slots *= 2; r->stream_timing = realloc( r->stream_timing, r->st_slots * sizeof(*r->stream_timing) ); st = r->stream_timing + slot; } st->id = buf->id; st->average = 30.*90.; if ( r->saw_video ) st->last = buf->renderOffset - st->average; else st->last = -st->average; if ( ( st->is_audio = is_audio( r, buf->id ) ) != 0 ) { r->saw_audio = 1; } st[1].id = -1; } return st; } // update the average inter-packet time of the stream associated with 'buf' // using a recursive low-pass filter with a 16 packet time constant. static void update_ipt( hb_reader_t *r, const hb_buffer_t *buf ) { stream_timing_t *st = id_to_st( r, buf ); double dt = buf->renderOffset - st->last; st->average += ( dt - st->average ) * (1./32.); st->last = buf->renderOffset; } // use the per-stream state associated with 'buf' to compute a new scr_offset // such that 'buf' will follow the previous packet of this stream separated // by the average packet time of the stream. static void new_scr_offset( hb_reader_t *r, hb_buffer_t *buf ) { stream_timing_t *st = id_to_st( r, buf ); int64_t nxt = st->last + st->average; r->scr_offset = buf->renderOffset - nxt; buf->renderOffset = nxt; r->scr_changes = r->demux.scr_changes; st->last = buf->renderOffset; } /*********************************************************************** * ReaderFunc *********************************************************************** * **********************************************************************/ static void ReaderFunc( void * _r ) { hb_reader_t * r = _r; hb_fifo_t ** fifos; hb_buffer_t * buf; hb_list_t * list; int n; int chapter = -1; int chapter_end = r->job->chapter_end; if ( r->title->type == HB_DVD_TYPE ) { if ( !( r->dvd = hb_dvd_init( r->title->path ) ) ) return; } else if ( r->title->type == HB_STREAM_TYPE ) { if ( !( r->stream = hb_stream_open( r->title->path, r->title ) ) ) return; } else { // Unknown type, should never happen return; } if (r->dvd) { /* * XXX this code is a temporary hack that should go away if/when * chapter merging goes away in libhb/dvd.c * map the start and end chapter numbers to on-media chapter * numbers since chapter merging could cause the handbrake numbers * to diverge from the media numbers and, if our chapter_end is after * a media chapter that got merged, we'll stop ripping too early. */ int start = r->job->chapter_start; hb_chapter_t *chap = hb_list_item( r->title->list_chapter, chapter_end - 1 ); chapter_end = chap->index; if (start > 1) { chap = hb_list_item( r->title->list_chapter, start - 1 ); start = chap->index; } /* end chapter mapping XXX */ if( !hb_dvd_start( r->dvd, r->title, start ) ) { hb_dvd_close( &r->dvd ); return; } if (r->job->angle) { hb_dvd_set_angle( r->dvd, r->job->angle ); } if ( r->job->start_at_preview ) { // XXX code from DecodePreviews - should go into its own routine hb_dvd_seek( r->dvd, (float)r->job->start_at_preview / ( r->job->seek_points ? ( r->job->seek_points + 1.0 ) : 11.0 ) ); } } else if ( r->stream && r->job->start_at_preview ) { // XXX code from DecodePreviews - should go into its own routine hb_stream_seek( r->stream, (float)( r->job->start_at_preview - 1 ) / ( r->job->seek_points ? ( r->job->seek_points + 1.0 ) : 11.0 ) ); } else if( r->stream ) { /* * Standard stream, seek to the starting chapter, if set, and track the * end chapter so that we end at the right time. */ int start = r->job->chapter_start; hb_chapter_t *chap = hb_list_item( r->title->list_chapter, chapter_end - 1 ); chapter_end = chap->index; if (start > 1) { chap = hb_list_item( r->title->list_chapter, start - 1 ); start = chap->index; } /* * Seek to the start chapter. */ hb_stream_seek_chapter( r->stream, start ); } list = hb_list_init(); hb_buffer_t *ps = hb_buffer_init( HB_DVD_READ_BUFFER_SIZE ); while( !*r->die && !r->job->done ) { if (r->dvd) chapter = hb_dvd_chapter( r->dvd ); else if (r->stream) chapter = hb_stream_chapter( r->stream ); if( chapter < 0 ) { hb_log( "reader: end of the title reached" ); break; } if( chapter > chapter_end ) { hb_log( "reader: end of chapter %d (media %d) reached at media chapter %d", r->job->chapter_end, chapter_end, chapter ); break; } if (r->dvd) { if( !hb_dvd_read( r->dvd, ps ) ) { break; } } else if (r->stream) { if ( !hb_stream_read( r->stream, ps ) ) { break; } } if( r->job->indepth_scan ) { /* * Need to update the progress during a subtitle scan */ hb_state_t state; #define p state.param.working state.state = HB_STATE_WORKING; p.progress = (double)chapter / (double)r->job->chapter_end; if( p.progress > 1.0 ) { p.progress = 1.0; } p.rate_avg = 0.0; p.hours = -1; p.minutes = -1; p.seconds = -1; hb_set_state( r->job->h, &state ); } (hb_demux[r->title->demuxer])( ps, list, &r->demux ); while( ( buf = hb_list_item( list, 0 ) ) ) { hb_list_rem( list, buf ); fifos = GetFifoForId( r->job, buf->id ); if ( fifos && ! r->saw_video ) { // The first data packet with a PTS from an audio or video stream // that we're decoding defines 'time zero'. Discard packets until // we get one. if ( buf->start != -1 && buf->renderOffset != -1 && ( buf->id == r->title->video_id || is_audio( r, buf->id ) ) ) { // force a new scr offset computation r->scr_changes = r->demux.scr_changes - 1; // create a stream state if we don't have one so the // offset will get computed correctly. id_to_st( r, buf ); r->saw_video = 1; hb_log( "reader: first SCR %"PRId64" id %d DTS %"PRId64, r->demux.last_scr, buf->id, buf->renderOffset ); } else { fifos = NULL; } } if( fifos ) { if ( buf->renderOffset != -1 ) { if ( r->scr_changes == r->demux.scr_changes ) { // This packet is referenced to the same SCR as the last. // Adjust timestamp to remove the System Clock Reference // offset then update the average inter-packet time // for this stream. buf->renderOffset -= r->scr_offset; update_ipt( r, buf ); } else { // This is the first audio or video packet after an SCR // change. Compute a new scr offset that would make this // packet follow the last of this stream with the correct // average spacing. stream_timing_t *st = find_st( r, buf ); if ( st ) { // if this is the video stream and we don't have // audio yet or this is an audio stream // generate a new scr if ( st->is_audio || ( st == r->stream_timing && !r->saw_audio ) ) { new_scr_offset( r, buf ); } else { // defer the scr change until we get some // audio since audio has a timestamp per // frame but video & subtitles don't. Clear // the timestamps so the decoder will generate // them from the frame durations. if ( st != r->stream_timing ) { // not a video stream so it's probably // subtitles - the best we can do is to // line it up with the last video packet. buf->start = r->stream_timing->last; } else { buf->start = -1; buf->renderOffset = -1; } } } else { // we got a new scr at the same time as the first // packet of a stream we've never seen before. We // have no idea what the timing should be so toss // this buffer & wait for a stream we've already seen. // add stream to list of streams we have seen id_to_st( r, buf ); hb_buffer_close( &buf ); continue; } } } if ( buf->start != -1 ) { buf->start -= r->scr_offset; if ( r->job->pts_to_stop && buf->start > r->job->pts_to_stop ) { // we're doing a subset of the input and we've hit the // stopping point. hb_buffer_close( &buf ); goto done; } } buf->sequence = r->sequence++; /* if there are mutiple output fifos, send a copy of the * buffer down all but the first (we have to not ship the * original buffer or we'll race with the thread that's * consuming the buffer & inject garbage into the data stream). */ for( n = 1; fifos[n] != NULL; n++) { hb_buffer_t *buf_copy = hb_buffer_init( buf->size ); hb_buffer_copy_settings( buf_copy, buf ); memcpy( buf_copy->data, buf->data, buf->size ); push_buf( r, fifos[n], buf_copy ); } push_buf( r, fifos[0], buf ); } else { hb_buffer_close( &buf ); } } } done: // send empty buffers downstream to video & audio decoders to signal we're done. if( !*r->die && !r->job->done ) { push_buf( r, r->job->fifo_mpeg2, hb_buffer_init(0) ); hb_audio_t *audio; for( n = 0; (audio = hb_list_item( r->job->title->list_audio, n)); ++n ) { if ( audio->priv.fifo_in ) push_buf( r, audio->priv.fifo_in, hb_buffer_init(0) ); } hb_subtitle_t *subtitle; for( n = 0; (subtitle = hb_list_item( r->job->title->list_subtitle, n)); ++n ) { if ( subtitle->fifo_in && subtitle->source == VOBSUB) push_buf( r, subtitle->fifo_in, hb_buffer_init(0) ); } } hb_list_empty( &list ); hb_buffer_close( &ps ); if (r->dvd) { hb_dvd_stop( r->dvd ); hb_dvd_close( &r->dvd ); } else if (r->stream) { hb_stream_close(&r->stream); } if ( r->stream_timing ) { free( r->stream_timing ); } hb_log( "reader: done. %d scr changes", r->demux.scr_changes ); if ( r->demux.dts_drops ) { hb_log( "reader: %d drops because DTS out of range", r->demux.dts_drops ); } free( r ); _r = NULL; } /*********************************************************************** * GetFifoForId *********************************************************************** * **********************************************************************/ static hb_fifo_t ** GetFifoForId( hb_job_t * job, int id ) { hb_title_t * title = job->title; hb_audio_t * audio; hb_subtitle_t * subtitle; int i, n, count; static hb_fifo_t * fifos[100]; memset(fifos, 0, sizeof(fifos)); if( id == title->video_id ) { if( job->indepth_scan ) { /* * Ditch the video here during the indepth scan until * we can improve the MPEG2 decode performance. */ return NULL; } else { fifos[0] = job->fifo_mpeg2; return fifos; } } n = 0; count = hb_list_count( title->list_subtitle ); count = count > 99 ? 99 : count; for( i=0; i < count; i++ ) { subtitle = hb_list_item( title->list_subtitle, i ); if (id == subtitle->id) { subtitle->hits++; if( !job->indepth_scan || job->select_subtitle_config.force ) { /* * Pass the subtitles to be processed if we are not scanning, or if * we are scanning and looking for forced subs, then pass them up * to decode whether the sub is a forced one. */ fifos[n++] = subtitle->fifo_in; } } } if ( n != 0 ) { return fifos; } if( !job->indepth_scan ) { n = 0; for( i = 0; i < hb_list_count( title->list_audio ); i++ ) { audio = hb_list_item( title->list_audio, i ); if( id == audio->id ) { fifos[n++] = audio->priv.fifo_in; } } if( n != 0 ) { return fifos; } } return NULL; }