/// <summary>
/// Get the next segment of Ogg data decoded into PCM format
/// </summary>
/// <param name="SegmentLength">
/// A <see cref="System.Int32"/> indicating the number of bytes of data to request.
/// Defaults to 4096 if set to 0.
/// Use the ReturnValue property of the result to discover how many bytes are actually returned
/// </param>
/// <returns>
/// Am <see cref="OggBufferSegment"/> containing the returned data
/// </returns>
public OggBufferSegment GetBufferSegment(int SegmentLength)
{
if (SegmentLength <= 0)
{
SegmentLength = _SEGMENTLENGTH;
} // If segment length is invalid, use default segment length
OggBufferSegment retVal; // Declare the buffer segment structure
retVal.BufferLength = SegmentLength;
retVal.Buffer = new Byte[retVal.BufferLength]; // Init buffer
retVal.ReturnValue = m_CSVorbisFileInstance.read(retVal.Buffer, retVal.BufferLength, _BIGENDIANREADMODE, _WORDREADMODE, _SGNEDREADMODE, null);
retVal.RateHz = m_TagLibFile.Properties.AudioSampleRate; //m_Info[0].rate;
return(retVal);
}
/// <summary>
/// Begins playing the given clip.
/// </summary>
/// <param name="file">The clip to play.</param>
public void Play(VorbisFileInstance clip)
{
DequeuUsedBuffers();
CurrentFormat = DetermineFormat(clip);
CurrentRate = DetermineRate(clip);
CurrentClip = clip;
eof = false;
// Buffer initial audio
int usedBuffers = 0;
for (int i = 0; i < BufferCount; i++)
{
int bytesRead = clip.read(SegmentBuffer, SegmentBuffer.Length,
_BIGENDIANREADMODE, _WORDREADMODE, _SGNEDREADMODE, null);
if (bytesRead > 0)
{
// Buffer the segment
AL.BufferData(Buffers[i], CurrentFormat, SegmentBuffer, bytesRead,
CurrentRate);
usedBuffers++;
}
else if (bytesRead == 0)
{
// Clip is too small to fill the initial buffer, so stop
// buffering.
break;
}
else
{
// TODO: There was an error reading the file
throw new System.IO.IOException("Error reading or processing OGG file");
}
}
// Start playing the clip
AL.SourceQueueBuffers(Source, usedBuffers, Buffers);
AL.SourcePlay(Source);
}
/// <summary>
/// Caches the given number of bytes by reading them in and discarding
/// them. This is useful so that when the sound if first played,
/// there's not a delay.
/// </summary>
/// <param name="bytes">Then number of PCM bytes to read.</param>
protected void Cache(int bytes)
{
VorbisFileInstance instance = rawClip.makeInstance();
int totalBytes = 0;
byte[] buffer = new byte[4096];
while (totalBytes < bytes)
{
int bytesRead = instance.read(buffer, buffer.Length, 0, 2, 1, null);
if (bytesRead <= 0)
{
break;
}
totalBytes += bytesRead;
}
}