static int reader_work( hb_work_object_t * w, hb_buffer_t ** buf_in, hb_buffer_t ** buf_out) { hb_work_private_t * r = w->private_data; hb_fifo_t ** fifos; hb_buffer_t * buf; hb_buffer_list_t list; int ii, chapter = -1; hb_buffer_list_clear(&list); if (r->bd) chapter = hb_bd_chapter( r->bd ); else 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" ); reader_send_eof(r); return HB_WORK_DONE; } if( chapter > r->chapter_end ) { hb_log("reader: end of chapter %d (media %d) reached at media chapter %d", r->job->chapter_end, r->chapter_end, chapter); reader_send_eof(r); return HB_WORK_DONE; } if (r->bd) { if( (buf = hb_bd_read( r->bd )) == NULL ) { reader_send_eof(r); return HB_WORK_DONE; } } else if (r->dvd) { if( (buf = hb_dvd_read( r->dvd )) == NULL ) { reader_send_eof(r); return HB_WORK_DONE; } } else if (r->stream) { if ( (buf = hb_stream_read( r->stream )) == NULL ) { reader_send_eof(r); return HB_WORK_DONE; } } (hb_demux[r->title->demuxer])(buf, &list, &r->demux); while ((buf = hb_buffer_list_rem_head(&list)) != NULL) { fifos = GetFifoForId( r, buf->s.id ); if (fifos && r->stream && r->start_found == 2 ) { // We will inspect the timestamps of each frame in sync // to skip from this seek point to the timestamp we // want to start at. if (buf->s.start != AV_NOPTS_VALUE && buf->s.start < r->job->pts_to_start) { r->job->pts_to_start -= buf->s.start; } else if ( buf->s.start >= r->job->pts_to_start ) { r->job->pts_to_start = 0; } r->start_found = 1; } if ( fifos && ! r->saw_video && !r->job->indepth_scan ) { // 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->s.start != AV_NOPTS_VALUE && buf->s.renderOffset != AV_NOPTS_VALUE && (buf->s.id == r->title->video_id || is_audio( r, buf->s.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, 1 ); r->saw_video = 1; hb_log( "reader: first SCR %"PRId64" id 0x%x DTS %"PRId64, r->demux.last_scr, buf->s.id, buf->s.renderOffset ); } else { fifos = NULL; } } if ( r->job->indepth_scan || fifos ) { if ( buf->s.renderOffset != AV_NOPTS_VALUE ) { if ( r->scr_changes != r->demux.scr_changes ) { // 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 = id_to_st( r, buf, 0 ); // 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 ); r->sub_scr_set = 0; } 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 (is_subtitle(r, buf->s.id) && buf->s.start != AV_NOPTS_VALUE) { if (!r->sub_scr_set) { // We can't generate timestamps in the // subtitle decoder as we can for // audio & video. So we need to make // the closest guess that we can // for the subtitles start time here. int64_t last = r->stream_timing[0].last; r->scr_offset = buf->s.start - last; r->sub_scr_set = 1; } } else { buf->s.start = AV_NOPTS_VALUE; buf->s.renderOffset = AV_NOPTS_VALUE; } } } } if ( buf->s.start != AV_NOPTS_VALUE ) { int64_t start = buf->s.start - r->scr_offset; if (!r->start_found || r->job->indepth_scan) { UpdateState( r, start ); } if (r->job->indepth_scan && r->job->pts_to_stop && start >= r->pts_to_start + r->job->pts_to_stop) { // sync normally would terminate p-to-p // but sync doesn't run during indepth scan hb_log("reader: reached pts %"PRId64", exiting early", start); reader_send_eof(r); hb_buffer_list_close(&list); return HB_WORK_DONE; } if (!r->start_found && start >= r->pts_to_start) { // pts_to_start point found // Note that this code path only gets executed for // medai where we have not performed an initial seek // to get close to the start time. So the 'start' time // is the time since the first frame. if (r->stream) { // libav multi-threaded decoders can get into // a bad state if the initial data is not // decodable. So try to improve the chances of // a good start by waiting for an initial iframe hb_stream_set_need_keyframe(r->stream, 1); hb_buffer_close( &buf ); continue; } r->start_found = 1; // sync.c also pays attention to job->pts_to_start // It eats up the 10 second slack that we build in // to the start time here in reader (so that video // decode is clean at the start time). // sync.c expects pts_to_start to be relative to the // first timestamp it sees. if (r->job->pts_to_start > start) { r->job->pts_to_start -= start; } else { r->job->pts_to_start = 0; } } // This log is handy when you need to debug timing problems //hb_log("id %x scr_offset %"PRId64 // " start %"PRId64" --> %"PRId64"", // buf->s.id, r->scr_offset, buf->s.start, // buf->s.start - r->scr_offset); buf->s.start -= r->scr_offset; if ( buf->s.stop != AV_NOPTS_VALUE ) { buf->s.stop -= r->scr_offset; } } if ( buf->s.renderOffset != AV_NOPTS_VALUE ) { // 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->s.renderOffset -= r->scr_offset; update_ipt( r, buf ); } #if 0 // JAS: This was added to fix a rare "audio time went backward" // sync error I found in one sample. But it has a bad side // effect on DVDs, causing frequent "adding silence" sync // errors. So I am disabling it. else { update_ipt( r, buf ); } #endif } buf = splice_discontinuity(r, buf); if( fifos && buf != NULL ) { if ( !r->start_found ) { hb_buffer_close( &buf ); continue; } 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 (ii = 1; fifos[ii] != NULL; ii++) { hb_buffer_t *buf_copy = hb_buffer_init(buf->size); buf_copy->s = buf->s; memcpy(buf_copy->data, buf->data, buf->size); push_buf(r, fifos[ii], buf_copy); } push_buf(r, fifos[0], buf); buf = NULL; } else { hb_buffer_close(&buf); } } hb_buffer_list_close(&list); return HB_WORK_OK; }
static int reader_work( hb_work_object_t * w, hb_buffer_t ** buf_in, hb_buffer_t ** buf_out) { hb_work_private_t * r = w->private_data; hb_fifo_t ** fifos; hb_buffer_t * buf; hb_buffer_list_t list; int ii, chapter = -1; hb_buffer_list_clear(&list); if (r->bd) chapter = hb_bd_chapter( r->bd ); else 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" ); reader_send_eof(r); return HB_WORK_DONE; } if( chapter > r->chapter_end ) { hb_log("reader: end of chapter %d (media %d) reached at media chapter %d", r->job->chapter_end, r->chapter_end, chapter); reader_send_eof(r); return HB_WORK_DONE; } if (r->bd) { if( (buf = hb_bd_read( r->bd )) == NULL ) { reader_send_eof(r); return HB_WORK_DONE; } } else if (r->dvd) { if( (buf = hb_dvd_read( r->dvd )) == NULL ) { reader_send_eof(r); return HB_WORK_DONE; } } else if (r->stream) { if ( (buf = hb_stream_read( r->stream )) == NULL ) { reader_send_eof(r); return HB_WORK_DONE; } } else { // This should never happen hb_error("Stream not initialized"); reader_send_eof(r); return HB_WORK_DONE; } (hb_demux[r->title->demuxer])(buf, &list, &r->demux); while ((buf = hb_buffer_list_rem_head(&list)) != NULL) { fifos = GetFifoForId( r, buf->s.id ); if (fifos && r->stream && !r->start_found) { // libav is allowing SSA subtitles to leak through that are // prior to the seek point. So only make the adjustment to // pts_to_start after we see the next video buffer. if (buf->s.id != r->job->title->video_id) { hb_buffer_close(&buf); continue; } // We will inspect the timestamps of each frame in sync // to skip from this seek point to the timestamp we // want to start at. if (buf->s.start != AV_NOPTS_VALUE && buf->s.start < r->job->pts_to_start) { r->job->pts_to_start -= buf->s.start; } else if ( buf->s.start >= r->job->pts_to_start ) { r->job->pts_to_start = 0; } r->start_found = 1; } if (buf->s.start != AV_NOPTS_VALUE && r->scr_changes != r->demux.scr_changes) { // First valid timestamp after an SCR change. Update // the per-stream scr sequence number r->scr_changes = r->demux.scr_changes; // libav tries to be too smart with timestamps and // enforces unnecessary conditions. One such condition // is that subtitle timestamps must be monotonically // increasing. To ensure this is the case, we calculate // an offset upon each SCR change that will guarantee this. // This is just a very rough SCR offset. A fine grained // offset that maintains proper sync is calculated in sync.c if (r->last_pts != AV_NOPTS_VALUE) { r->scr_offset = r->last_pts + 90000 - buf->s.start; } else { r->scr_offset = -buf->s.start; } } // Set the scr sequence that this buffer's timestamps are // referenced to. buf->s.scr_sequence = r->scr_changes; if (buf->s.start != AV_NOPTS_VALUE) { buf->s.start += r->scr_offset; } if (buf->s.renderOffset != AV_NOPTS_VALUE) { buf->s.renderOffset += r->scr_offset; } if (buf->s.start > r->last_pts) { r->last_pts = buf->s.start; UpdateState(r); } buf = splice_discontinuity(r, buf); if (fifos && buf != NULL) { /* 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 (ii = 1; fifos[ii] != NULL; ii++) { hb_buffer_t *buf_copy = hb_buffer_init(buf->size); buf_copy->s = buf->s; memcpy(buf_copy->data, buf->data, buf->size); push_buf(r, fifos[ii], buf_copy); } push_buf(r, fifos[0], buf); buf = NULL; } else { hb_buffer_close(&buf); } } hb_buffer_list_close(&list); return HB_WORK_OK; }