private void WriteFrame(Frame frame, VirtualTrack track, long start, long end, int frameSize, long imageStartSample, long offset)
{
TrackFrame trackFrame = new TrackFrame(offset, frameSize, imageStartSample);
trackFrame.imageBlockSize = frame.Header.BlockSize;
trackFrame.startSample = sampleCount_;
trackFrame.virtualOffset = track.Size;
int count = (int)(end - start);
int virtualSize;
int sizeDifference = 0;
if (frame.Header.BlockSize == count)
{
sizeDifference = flac.Io.UTF8Encoder.GetUtf8ULong(sampleCount_).Length - frame.Header.SampleIdSize;
virtualSize = frameSize + sizeDifference;
#if DEBUG
frame.Header.StartingSampleNumber = sampleCount_;
frame.Header.BlockingStrategy = FrameHeader.BLOCKING_STRATEGY_VARIABLE;
outStream_.Writer.Truncate(0);
frame.Write(outStream_);
Debug.Assert(virtualSize == outStream_.Writer.Debug_BytesWritten);
#endif
}
else
{
frame.Header.StartingSampleNumber = sampleCount_;
frame.Header.BlockingStrategy = FrameHeader.BLOCKING_STRATEGY_VARIABLE;
frame.Header.BlockSize = count;
outStream_.Writer.Truncate(0);
frame.Write(outStream_, (int)(start - imageStartSample), count);
virtualSize = Convert.ToInt32(outStream_.Writer.Debug_BytesWritten);
sizeDifference = virtualSize - frameSize;
}
trackFrame.sizeDifference = sizeDifference;
track.Frames.Add(trackFrame.virtualOffset, trackFrame);
track.Size += virtualSize;
track.MinBlockSize = Math.Min(track.MinBlockSize, frame.Header.BlockSize);
track.MaxBlockSize = Math.Max(track.MaxBlockSize, frame.Header.BlockSize);
track.MinFrameSize = (int)Math.Min(track.MinFrameSize, virtualSize);
track.MaxFrameSize = (int)Math.Max(track.MaxFrameSize, virtualSize);
sampleCount_ += frame.Header.BlockSize;
}
void LoadFromXml(string dir, XmlNode track)
{
FileName = track.Attributes["name"].Value;
StartSample = Convert.ToInt64(track.Attributes["startSample"].Value);
EndSample = Convert.ToInt64(track.Attributes["endSample"].Value);
Metadata = LoadMetadata(dir, FileName);
long metadataBlockSize = Metadata.block.Length + 4; // 4 is size of metadatablockheader
Size = Convert.ToInt64(track.Attributes["size"].Value) + metadataBlockSize;
MinBlockSize = Convert.ToInt32(track.Attributes["minBlockSize"].Value);
MaxBlockSize = Convert.ToInt32(track.Attributes["maxBlockSize"].Value);
MinFrameSize = Convert.ToInt32(track.Attributes["minFrameSize"].Value);
MaxFrameSize = Convert.ToInt32(track.Attributes["maxFrameSize"].Value);
TotalSamples = Convert.ToInt64(track.Attributes["totalSamples"].Value);
XmlNode frames = track.SelectSingleNode("frames");
MemoryStream ms = new MemoryStream(Convert.FromBase64String(frames.InnerText));
BinaryReader br = new BinaryReader(ms);
while (ms.Position < ms.Length)
{
TrackFrame trackFrame = new TrackFrame(br, metadataBlockSize);
frames_.Add(trackFrame.virtualOffset, trackFrame);
}
frames_.Values[0].CalculateVirtualBlockSizeDifference(StartSample, true);
frames_.Values[frames_.Count - 1].CalculateVirtualBlockSizeDifference(EndSample, false);
}