internal void LoadSoundInMemory()
{
if (PreloadedBuffer.Ptr != IntPtr.Zero)
{
return;
}
using (var soundStream = FileProvider.OpenStream(CompressedDataUrl, VirtualFileMode.Open, VirtualFileAccess.Read, VirtualFileShare.Read, StreamFlags.Seekable))
using (var decoder = new Celt(SampleRate, CompressedSoundSource.SamplesPerFrame, Channels, true))
{
var reader = new BinarySerializationReader(soundStream);
var samplesPerPacket = CompressedSoundSource.SamplesPerFrame * Channels;
PreloadedBuffer = AudioLayer.BufferCreate(samplesPerPacket * NumberOfPackets * sizeof(short));
var memory = new UnmanagedArray <short>(samplesPerPacket * NumberOfPackets);
var offset = 0;
var outputBuffer = new short[samplesPerPacket];
for (var i = 0; i < NumberOfPackets; i++)
{
var len = reader.ReadInt16();
var compressedBuffer = reader.ReadBytes(len);
var samplesDecoded = decoder.Decode(compressedBuffer, len, outputBuffer);
memory.Write(outputBuffer, offset, 0, samplesDecoded * Channels);
offset += samplesDecoded * Channels * sizeof(short);
}
// Ignore invalid data at beginning (due to encoder delay) & end of stream (due to packet size)
var samplesToSkip = decoder.GetDecoderSampleDelay();
AudioLayer.BufferFill(PreloadedBuffer, memory.Pointer + samplesToSkip * Channels * sizeof(short), Samples * Channels * sizeof(short), SampleRate, Channels == 1);
memory.Dispose();
}
}
/// <summary>
/// Initializes a new instance of the <see cref="DynamicSoundSource"/> class.
/// Sub classes can implement their own streaming sources.
/// </summary>
/// <param name="soundInstance">the sound instance associated.</param>
/// <param name="numberOfBuffers">the size of the streaming ring-buffer.</param>
/// <param name="maxBufferSizeBytes">the maximum size of each buffer.</param>
protected DynamicSoundSource(SoundInstance soundInstance, int numberOfBuffers, int maxBufferSizeBytes)
{
nativeBufferSizeBytes = maxBufferSizeBytes;
prebufferedTarget = (int)Math.Ceiling(numberOfBuffers / 3.0);
this.soundInstance = soundInstance;
for (var i = 0; i < numberOfBuffers; i++)
{
var buffer = AudioLayer.BufferCreate(nativeBufferSizeBytes);
deviceBuffers.Add(buffer);
freeBuffers.Enqueue(deviceBuffers[i]);
}
if (readFromDiskWorker == null)
{
readFromDiskWorker = Task.Factory.StartNew(Worker, TaskCreationOptions.LongRunning);
}
}
