/// <summary>
/// Reads bytes from this stream
/// </summary>
/// <param name="array">Buffer to read into</param>
/// <param name="offset">Offset in array to read into</param>
/// <param name="count">Number of bytes to read</param>
/// <returns>Number of bytes read</returns>
public override int Read(byte[] array, int offset, int count)
{
lock (lockObject)
{
if (Enabled)
{
if (sourceBuffer == null || sourceBuffer.Length < count)
{
sourceBuffer = new byte[count];
}
int sourceBytesRead = sourceStream.Read(sourceBuffer, 0, count);
int sampleCount = sourceBytesRead / (bytesPerSample * channels);
for (int sample = 0; sample < sampleCount; sample++)
{
int start = sample * bytesPerSample * channels;
double in1;
double in2;
ReadSamples(sourceBuffer, start, out in1, out in2);
simpleCompressor.Process(ref in1, ref in2);
WriteSamples(array, offset + start, in1, in2);
}
return(count);
}
else
{
return(sourceStream.Read(array, offset, count));
}
}
}
/// <summary>
/// Reads bytes from this wave stream
/// </summary>
/// <param name="destBuffer">The destination buffer</param>
/// <param name="offset">Offset into the destination buffer</param>
/// <param name="numBytes">Number of bytes read</param>
/// <returns>Number of bytes read.</returns>
public override int Read(byte[] destBuffer, int offset, int numBytes)
{
lock (lockObject)
{
int bytesWritten = 0;
// 1. fill with silence
if (position < audioStartPosition)
{
bytesWritten = (int)Math.Min(numBytes, audioStartPosition - position);
for (int n = 0; n < bytesWritten; n++)
{
destBuffer[n + offset] = 0;
}
}
if (bytesWritten < numBytes)
{
// don't read too far into source stream
int sourceBytesRequired = (int)Math.Min(
numBytes - bytesWritten,
sourceLengthBytes + sourceOffsetBytes - sourceStream.Position);
int read = sourceStream.Read(destBuffer, bytesWritten + offset, sourceBytesRequired);
bytesWritten += read;
}
// 3. Fill out with zeroes
for (int n = bytesWritten; n < numBytes; n++)
{
destBuffer[offset + n] = 0;
}
position += numBytes;
return(numBytes);
}
}
/// <summary>
/// Reads bytes from this wave stream
/// </summary>
/// <param name="destBuffer">Destination buffer</param>
/// <param name="offset">Offset into destination buffer</param>
/// <param name="numBytes"></param>
/// <returns>Number of bytes read.</returns>
public override int Read(byte[] destBuffer, int offset, int numBytes)
{
lock (lockObject)
{
byte[] sourceBuffer = new byte[numBytes * 2];
int bytesRead = sourceStream.Read(sourceBuffer, 0, numBytes * 2);
Convert32To16(destBuffer, offset, sourceBuffer, bytesRead);
position += (bytesRead / 2);
return(bytesRead / 2);
}
}
/// <summary>
/// Creates an Aiff file by reading all the data from a WaveProvider
/// BEWARE: the WaveProvider MUST return 0 from its Read method when it is finished,
/// or the Aiff File will grow indefinitely.
/// </summary>
/// <param name="filename">The filename to use</param>
/// <param name="sourceProvider">The source WaveProvider</param>
public static void CreateAiffFile(string filename, WaveStream sourceProvider)
{
using (var writer = new AiffFileWriter(filename, sourceProvider.WaveFormat))
{
byte[] buffer = new byte[16384];
while (sourceProvider.Position < sourceProvider.Length)
{
int count = Math.Min((int)(sourceProvider.Length - sourceProvider.Position), buffer.Length);
int bytesRead = sourceProvider.Read(buffer, 0, count);
if (bytesRead == 0)
{
// end of source provider
break;
}
writer.Write(buffer, 0, bytesRead);
}
}
}
/// <summary>
/// Reads data from this stream
/// </summary>
/// <param name="buffer"></param>
/// <param name="offset"></param>
/// <param name="count"></param>
/// <returns></returns>
public override int Read(byte[] buffer, int offset, int count)
{
lock (lockObject)
{
// 1. attempt to fill the circular buffer with enough data to meet our request
while (BufferEndPosition < position + count)
{
int sourceReadCount = count;
if (sourceReadCount % sourceStream.BlockAlign != 0)
{
sourceReadCount = (count + sourceStream.BlockAlign) - (count % sourceStream.BlockAlign);
}
int sourceRead = sourceStream.Read(GetSourceBuffer(sourceReadCount), 0, sourceReadCount);
circularBuffer.Write(GetSourceBuffer(sourceReadCount), 0, sourceRead);
if (sourceRead == 0)
{
// assume we have run out of data
break;
}
}
// 2. discard any unnecessary stuff from the start
if (bufferStartPosition < position)
{
circularBuffer.Advance((int)(position - bufferStartPosition));
bufferStartPosition = position;
}
// 3. now whatever is in the buffer we can return
int bytesRead = circularBuffer.Read(buffer, offset, count);
position += bytesRead;
// anything left in buffer is at start position
bufferStartPosition = position;
return(bytesRead);
}
}
//private int leftoverSourceOffset = 0;
/// <summary>
/// Reads bytes from this stream
/// </summary>
/// <param name="buffer">Buffer to read into</param>
/// <param name="offset">Offset in buffer to read into</param>
/// <param name="count">Number of bytes to read</param>
/// <returns>Number of bytes read</returns>
public override int Read(byte[] buffer, int offset, int count)
{
int bytesRead = 0;
if (count % BlockAlign != 0)
{
//throw new ArgumentException("Must read complete blocks");
count -= (count % BlockAlign);
}
while (bytesRead < count)
{
// first copy in any leftover destination bytes
int readFromLeftoverDest = Math.Min(count - bytesRead, leftoverDestBytes);
if (readFromLeftoverDest > 0)
{
Array.Copy(conversionStream.DestBuffer, leftoverDestOffset, buffer, offset + bytesRead, readFromLeftoverDest);
leftoverDestOffset += readFromLeftoverDest;
leftoverDestBytes -= readFromLeftoverDest;
bytesRead += readFromLeftoverDest;
}
if (bytesRead >= count)
{
// we've fulfilled the request from the leftovers alone
break;
}
// now we'll convert one full source buffer
if (leftoverSourceBytes > 0)
{
// TODO: still to be implemented: see moving the source position back below:
}
// always read our preferred size, we can always keep leftovers for the next call to Read if we get
// too much
int sourceBytesRead = sourceStream.Read(conversionStream.SourceBuffer, 0, preferredSourceReadSize);
if (sourceBytesRead == 0)
{
// we've reached the end of the input
break;
}
int sourceBytesConverted;
int destBytesConverted = conversionStream.Convert(sourceBytesRead, out sourceBytesConverted);
if (sourceBytesConverted == 0)
{
Debug.WriteLine(String.Format("Warning: couldn't convert anything from {0}", sourceBytesRead));
// no point backing up in this case as we're not going to manage to finish playing this
break;
}
else if (sourceBytesConverted < sourceBytesRead)
{
// cheat by backing up in the source stream (better to save the lefto
sourceStream.Position -= (sourceBytesRead - sourceBytesConverted);
}
if (destBytesConverted > 0)
{
int bytesRequired = count - bytesRead;
int toCopy = Math.Min(destBytesConverted, bytesRequired);
// save leftovers
if (toCopy < destBytesConverted)
{
leftoverDestBytes = destBytesConverted - toCopy;
leftoverDestOffset = toCopy;
}
Array.Copy(conversionStream.DestBuffer, 0, buffer, bytesRead + offset, toCopy);
bytesRead += toCopy;
}
else
{
// possible error here
Debug.WriteLine(string.Format("sourceBytesRead: {0}, sourceBytesConverted {1}, destBytesConverted {2}",
sourceBytesRead, sourceBytesConverted, destBytesConverted));
//Debug.Assert(false, "conversion stream returned nothing at all");
break;
}
}
position += bytesRead;
return(bytesRead);
}
