matroskadec_haali: optimize fuzzy CueAware seeking
This allows finding Cues that would match the same frame as the requested timecode, and allow for more accurate seeking on ordered chapter boundaries.
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@ -3059,20 +3059,38 @@ static inline ulonglong mkv_time_diff(ulonglong one, ulonglong two)
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return two-one;
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}
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void mkv_Seek_CueAware(MatroskaFile *mf, ulonglong timecode, unsigned flags)
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void mkv_Seek_CueAware(MatroskaFile *mf, ulonglong timecode, unsigned flags, unsigned fuzzy)
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{
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if (timecode > 0 && (flags & (MKVF_SEEK_TO_PREV_KEYFRAME|MKVF_SEEK_TO_PREV_KEYFRAME_STRICT))) {
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unsigned int count, i;
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unsigned char track = 0;
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ulonglong default_duration = 10000000;
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Cue *cue;
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for (i=0;i<mf->nTracks;++i) {
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if (mf->Tracks[i]->Type == TT_VIDEO && !(mf->trackMask & (ULL(1)<<i))) {
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track = mf->Tracks[i]->Number;
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if (mf->Tracks[i]->DefaultDuration)
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default_duration = mf->Tracks[i]->DefaultDuration;
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break;
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}
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}
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mkv_GetCues(mf, &cue, &count);
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if (count > 0) {
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ulonglong prevDiff = ULLONG_MAX;
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ulonglong newTimecode = timecode;
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for (i = 0; i < count; i++) {
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ulonglong tcDiff = mkv_time_diff(cue[i].Time, timecode);
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if (tcDiff == 0 || (cue[i].Track && cue[i].Track <= mf->nTracks && tcDiff <= mf->Tracks[cue[i].Track-1]->DefaultDuration)) {
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if ((!track || !cue[i].Track || cue[i].Track == track) && (tcDiff == 0 || (fuzzy && tcDiff <= default_duration))) {
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flags &= ~(MKVF_SEEK_TO_PREV_KEYFRAME|MKVF_SEEK_TO_PREV_KEYFRAME_STRICT);
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timecode = cue[i].Time;
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if (tcDiff < prevDiff) {
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newTimecode = cue[i].Time;
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prevDiff = tcDiff;
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}
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}
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}
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timecode = newTimecode;
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}
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}
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mkv_Seek(mf, timecode, flags);
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@ -341,7 +341,7 @@ X void mkv_Seek(/* in */ MatroskaFile *mf,
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/* in */ ulonglong timecode /* in ns */,
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/* in */ unsigned flags);
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X void mkv_Seek_CueAware(MatroskaFile *mf, ulonglong timecode, unsigned flags);
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X void mkv_Seek_CueAware(MatroskaFile *mf, ulonglong timecode, unsigned flags, unsigned fuzzy);
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X void mkv_SkipToKeyframe(MatroskaFile *mf);
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@ -1023,7 +1023,7 @@ static int mkv_read_header(AVFormatContext *s)
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if (ctx->virtual_timeline && ctx->timeline[0].need_seek) {
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ctx->matroska = ctx->timeline[ctx->timeline_position].segment->matroska;
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mkv_Seek_CueAware(ctx->matroska, ctx->timeline[0].chapter->Start, MKVF_SEEK_TO_PREV_KEYFRAME);
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mkv_Seek_CueAware(ctx->matroska, ctx->timeline[0].chapter->Start, MKVF_SEEK_TO_PREV_KEYFRAME, 1);
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}
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/* Tracks */
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@ -1288,7 +1288,7 @@ static int mkv_packet_timeline_update(AVFormatContext *s, ulonglong *start_time,
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if (ctx->timeline[ctx->timeline_position].need_seek) {
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av_log(s, AV_LOG_INFO, "Seeking to timeline %d (position %I64d)\n", ctx->timeline_position, ctx->timeline[ctx->timeline_position].chapter->Start);
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mkv_switch_segment(s, ctx->timeline[ctx->timeline_position].segment->matroska, 0);
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mkv_Seek_CueAware(ctx->matroska, ctx->timeline[ctx->timeline_position].chapter->Start, MKVF_SEEK_TO_PREV_KEYFRAME);
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mkv_Seek_CueAware(ctx->matroska, ctx->timeline[ctx->timeline_position].chapter->Start, MKVF_SEEK_TO_PREV_KEYFRAME, 1);
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// Need to discard the current frame, and re-read after the seek
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return AVERROR(EAGAIN);
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}
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@ -1512,7 +1512,7 @@ static int mkv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp
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mkv_SetTrackMask(ctx->matroska, mkv_get_track_mask(ctx));
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/* perform seek */
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mkv_Seek_CueAware(ctx->matroska, timestamp, mkvflags);
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mkv_Seek_CueAware(ctx->matroska, timestamp, mkvflags, 0);
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/* Update current timestamp */
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cur_dts = mkv_GetLowestQTimecode(ctx->matroska);
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