public ReaderBase(MkvMediaFile file, TrackEntry track)
{
clusters = file.clusters;
this.track = track;
trackNumber = track.trackNumber;
strippedHeaders = track.strippedHeaderBytes();
strippedHeaderBytes = strippedHeaders?.Length ?? 0;
seekIndex = file.segment.buildSeekIndex(trackNumber);
stream = file.stream;
loadCluster(0);
}
static IEnumerable <sSeekPos> listBlobsInClusters(ClustersCache cache, ulong trackNumber, int idx, int count = 3)
{
int endIdx = Math.Min(idx + count, cache.file.segment.cluster.Length);
for ( ; idx < endIdx; idx++)
{
lock (cache.syncRoot)
cache.file.loadCluster(idx, tempCluster);
foreach (var sp in listBlobsInCluster(tempCluster, trackNumber, idx))
{
yield return(sp);
}
}
}
public static MkvSeekPosition find(ClustersCache cache, TimeSpan where, ulong trackNumber)
{
ulong searchingTime = cache.timeScaler.convertBack(where);
int idx = Array.BinarySearch(cache.file.segment.cluster, new ClusterPlaceholder(searchingTime), clusterCompare);
if (idx < 0)
{
idx = (~idx) - 1;
}
if (idx < 0)
{
return(new MkvSeekPosition(TimeSpan.Zero, 0, 0));
}
if (null == tempCluster)
{
tempCluster = new ReusableCluster();
}
Logger.logDebug("FindSeekPosition.find, looking for {0}, scaled {1}, starting from {2}", where, searchingTime, idx);
// Create a new reusable one
ReusableCluster rc = new ReusableCluster();
sSeekPos? blob = listBlobsInClusters(cache, trackNumber, idx)
.Where(sp => sp.time <= searchingTime)
.Select(nullable)
.LastOrDefault();
if (!blob.HasValue)
{
throw new ApplicationException("Seek failed, might be trying to seek past the end");
}
TimeSpan time = cache.timeScaler.convert((long)blob.Value.time);
return(new MkvSeekPosition(time, blob.Value.cluster, blob.Value.blob));
}
public MkvMediaFile(Stream stream)
{
this.stream = stream;
segment = Segment.read(stream);
videoTrack = new VideoTrack(this, segment.findVideoTrack());
audioTrack = new AudioTrack(this, segment.findAudioTrack());
var in4 = segment.info[0];
if (in4.duration.HasValue)
{
double nano = in4.duration.Value * in4.timestampScale;
long ticks = (long)(nano * 0.01);
duration = TimeSpan.FromTicks(ticks);
}
else
{
throw new ArgumentException("THe MKV lacks the duration field");
}
clusters = new ClustersCache(this);
}
