/// <summary>
/// WaveStream to resample using the DMO Resampler
/// </summary>
/// <param name="inputProvider">Input Stream</param>
/// <param name="outputFormat">Desired Output Format</param>
public ResamplerDmoStream(IWaveProvider inputProvider, WaveFormat outputFormat)
{
this.inputProvider = inputProvider;
inputStream = inputProvider as WaveStream;
this.outputFormat = outputFormat;
resampler = new Resampler();
if (!resampler.MediaObject.SupportsInputWaveFormat(0, inputStream.WaveFormat))
{
throw new ArgumentException("Unsupported Input Stream format", "inputStream");
}
resampler.MediaObject.SetInputWaveFormat(0, inputStream.WaveFormat);
if (!resampler.MediaObject.SupportsOutputWaveFormat(0, outputFormat))
{
throw new ArgumentException("Unsupported Output Stream format", "outputStream");
}
resampler.MediaObject.SetOutputWaveFormat(0, outputFormat);
if (inputStream != null)
{
position = InputToOutputPosition(inputStream.Position);
}
inputMediaBuffer = new MediaBuffer(inputProvider.WaveFormat.AverageBytesPerSecond);
outputBuffer = new DmoOutputDataBuffer(outputFormat.AverageBytesPerSecond);
}
/// <summary>
/// Creates a stream that can convert to PCM
/// </summary>
/// <param name="sourceStream">The source stream</param>
/// <returns>A PCM stream</returns>
public static WaveStream CreatePcmStream(WaveStream sourceStream)
{
if (sourceStream.WaveFormat.Encoding == WaveFormatEncoding.Pcm)
{
return sourceStream;
}
WaveFormat pcmFormat = AcmStream.SuggestPcmFormat(sourceStream.WaveFormat);
return new WaveFormatConversionStream(pcmFormat, sourceStream);
}
/// <summary>
/// Create a new simple compressor stream
/// </summary>
/// <param name="sourceStream">Source stream</param>
public SimpleCompressorStream(WaveStream sourceStream)
{
this.sourceStream = sourceStream;
channels = sourceStream.WaveFormat.Channels;
bytesPerSample = sourceStream.WaveFormat.BitsPerSample/8;
simpleCompressor = new SimpleCompressor(5.0, 10.0, sourceStream.WaveFormat.SampleRate);
simpleCompressor.Threshold = 16;
simpleCompressor.Ratio = 6;
simpleCompressor.MakeUpGain = 16;
}
/// <summary>
/// Create a new WaveFormat conversion stream
/// </summary>
/// <param name="targetFormat">Desired output format</param>
/// <param name="sourceStream">Source stream</param>
public WaveFormatConversionStream(WaveFormat targetFormat, WaveStream sourceStream)
{
this.sourceStream = sourceStream;
this.targetFormat = targetFormat;
conversionStream = new AcmStream(sourceStream.WaveFormat, targetFormat);
// work out how many bytes the entire input stream will convert to
length = SourceToDest((int) sourceStream.Length);
blockAlign = SourceToDest(sourceStream.BlockAlign);
position = 0;
}
/// <summary>
/// Creates a new Wave32To16Stream
/// </summary>
/// <param name="sourceStream">the source stream</param>
public Wave32To16Stream(WaveStream sourceStream)
{
if (sourceStream.WaveFormat.Encoding != WaveFormatEncoding.IeeeFloat)
throw new ApplicationException("Only 32 bit Floating point supported");
if (sourceStream.WaveFormat.BitsPerSample != 32)
throw new ApplicationException("Only 32 bit Floating point supported");
waveFormat = new WaveFormat(sourceStream.WaveFormat.SampleRate, 16, sourceStream.WaveFormat.Channels);
volume = 1.0f;
this.sourceStream = sourceStream;
length = sourceStream.Length/2;
position = sourceStream.Position/2;
}
/// <summary>
/// Creates a new WaveOffsetStream
/// </summary>
/// <param name="sourceStream">the source stream</param>
/// <param name="startTime">the time at which we should start reading from the source stream</param>
/// <param name="sourceOffset">amount to trim off the front of the source stream</param>
/// <param name="sourceLength">length of time to play from source stream</param>
public WaveOffsetStream(WaveStream sourceStream, TimeSpan startTime, TimeSpan sourceOffset, TimeSpan sourceLength)
{
if (sourceStream.WaveFormat.Encoding != WaveFormatEncoding.Pcm)
throw new ApplicationException("Only PCM supported");
// TODO: add support for IEEE float + perhaps some others -
// anything with a fixed bytes per sample
this.sourceStream = sourceStream;
position = 0;
bytesPerSample = (sourceStream.WaveFormat.BitsPerSample/8)*sourceStream.WaveFormat.Channels;
StartTime = startTime;
SourceOffset = sourceOffset;
SourceLength = sourceLength;
}
/// <summary>
/// Creates a new WaveChannel32
/// </summary>
/// <param name="sourceStream">the source stream</param>
/// <param name="volume">stream volume (1 is 0dB)</param>
/// <param name="pan">pan control (-1 to 1)</param>
public WaveChannel32(WaveStream sourceStream, float volume, float pan)
{
PadWithZeroes = true;
if (sourceStream.WaveFormat.Encoding != WaveFormatEncoding.Pcm)
throw new ApplicationException("Only PCM supported");
if (sourceStream.WaveFormat.BitsPerSample != 16)
throw new ApplicationException("Only 16 bit audio supported");
// always outputs stereo 32 bit
waveFormat = WaveFormat.CreateIeeeFloatWaveFormat(sourceStream.WaveFormat.SampleRate, 2);
destBytesPerSample = 8; // includes stereo factoring
this.sourceStream = sourceStream;
this.volume = volume;
this.pan = pan;
sourceBytesPerSample = sourceStream.WaveFormat.Channels*sourceStream.WaveFormat.BitsPerSample/8;
length = SourceToDest(sourceStream.Length);
position = 0;
}
/// <summary>
/// Disposes this stream
/// </summary>
/// <param name="disposing">true if the user called this</param>
protected override void Dispose(bool disposing)
{
if (disposing)
{
// Release managed resources.
if (sourceStream != null)
{
sourceStream.Dispose();
sourceStream = null;
}
}
// Release unmanaged resources.
// Set large fields to null.
// Call Dispose on your base class.
base.Dispose(disposing);
}
/// <summary>
/// Disposes this stream
/// </summary>
/// <param name="disposing">true if the user called this</param>
protected override void Dispose(bool disposing)
{
if (disposing)
{
// Release managed resources.
if (conversionStream != null)
{
conversionStream.Dispose();
conversionStream = null;
}
if (sourceStream != null)
{
sourceStream.Dispose();
sourceStream = null;
}
}
else
{
Debug.Assert(false, "WaveFormatConversionStream was not disposed");
}
// Release unmanaged resources.
// Set large fields to null.
// Call Dispose on your base class.
base.Dispose(disposing);
}
/// <summary>
/// Disposes this WaveStream
/// </summary>
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (sourceStream != null)
{
sourceStream.Dispose();
sourceStream = null;
}
}
base.Dispose(disposing);
}
/// <summary>
/// Creates a WaveOffsetStream with default settings (no offset or pre-delay,
/// and whole length of source stream)
/// </summary>
/// <param name="sourceStream">The source stream</param>
public WaveOffsetStream(WaveStream sourceStream)
: this(sourceStream, TimeSpan.Zero, TimeSpan.Zero, sourceStream.TotalTime)
{
}
/// <summary>
/// Disposes this WaveStream
/// </summary>
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (sourceStream != null)
{
sourceStream.Dispose();
sourceStream = null;
}
}
else
{
Debug.Assert(false, "WaveOffsetStream was not Disposed");
}
base.Dispose(disposing);
}
/// <summary>
/// Creates a new BlockAlignReductionStream
/// </summary>
/// <param name="sourceStream">the input stream</param>
public BlockAlignReductionStream(WaveStream sourceStream)
{
this.sourceStream = sourceStream;
circularBuffer = new CircularBuffer(sourceStream.WaveFormat.AverageBytesPerSecond*4);
}
/// <summary>
/// Disposes this WaveStream
/// </summary>
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (sourceStream != null)
{
sourceStream.Dispose();
sourceStream = null;
}
}
else
{
Debug.Assert(false, "BlockAlignReductionStream was not Disposed");
}
base.Dispose(disposing);
}
/// <summary>
/// Creates a WaveChannel32 with default settings
/// </summary>
/// <param name="sourceStream">The source stream</param>
public WaveChannel32(WaveStream sourceStream)
:
this(sourceStream, 1.0f, 0.0f)
{
}
/// <summary>
/// Add a new input to the mixer
/// </summary>
/// <param name="waveStream">The wave input to add</param>
public void AddInputStream(WaveStream waveStream)
{
if (waveStream.WaveFormat.Encoding != WaveFormatEncoding.IeeeFloat)
throw new ArgumentException("Must be IEEE floating point", "waveStream.WaveFormat");
if (waveStream.WaveFormat.BitsPerSample != 32)
throw new ArgumentException("Only 32 bit audio currently supported", "waveStream.WaveFormat");
if (inputStreams.Count == 0)
{
// first one - set the format
int sampleRate = waveStream.WaveFormat.SampleRate;
int channels = waveStream.WaveFormat.Channels;
waveFormat = WaveFormat.CreateIeeeFloatWaveFormat(sampleRate, channels);
}
else
{
if (!waveStream.WaveFormat.Equals(waveFormat))
throw new ArgumentException("All incoming channels must have the same format", "inputStreams.WaveFormat");
}
lock (this)
{
inputStreams.Add(waveStream);
length = Math.Max(length, waveStream.Length);
// get to the right point in this input file
Position = Position;
}
}
/// <summary>
/// Remove a WaveStream from the mixer
/// </summary>
/// <param name="waveStream">waveStream to remove</param>
public void RemoveInputStream(WaveStream waveStream)
{
lock (this)
{
if (inputStreams.Remove(waveStream))
{
// recalculate the length
length = 0;
foreach (WaveStream inputStream in inputStreams)
{
length = Math.Max(length, waveStream.Length);
}
}
}
}
/// <summary>
/// Creates a Wave file by reading all the data from a WaveStream
/// </summary>
/// <param name="filename">The filename to use</param>
/// <param name="stream">The source WaveStream</param>
public static void CreateWaveFile(string filename, WaveStream stream)
{
using (var writer = new WaveFileWriter(filename, stream.WaveFormat))
{
var buffer = new byte[stream.WaveFormat.SampleRate*stream.WaveFormat.Channels*16];
while (true)
{
int bytesRead = stream.Read(buffer, 0, buffer.Length);
if (bytesRead == 0)
break;
writer.WriteData(buffer, 0, bytesRead);
}
}
}
