public int Read(float[] buffer, int offset, int count)
{
//If the resampler is null just read from upstream
if (_resampler == null)
{
return(_source.Read(buffer, offset, count));
}
//Early exit if no data is needed
if (count == 0)
{
return(0);
}
var channels = _source.WaveFormat.Channels;
float[] inBuffer;
int inBufferOffset;
var framesRequested = count / channels;
var inNeeded = _resampler.ResamplePrepare(framesRequested, channels, out inBuffer, out inBufferOffset);
var inAvailable = _source.Read(inBuffer, inBufferOffset, inNeeded * channels) / channels;
//Resampler does not handle zero samples well! If we read nothing, return nothing
if (inAvailable == 0)
{
return(0);
}
var outAvailable = _resampler.ResampleOut(buffer, offset, inAvailable, framesRequested, channels);
return(outAvailable * channels);
}
/// <summary>
/// Engages the specified source floats. This doc was autogenerated so it's weird.
/// </summary>
/// <param name="sourceFloats">The source floats.</param>
/// <param name="sourceLength">Length of the source -- how many floats to use from the provided buffer.</param>
/// <param name="resampledResult">The resampled result.</param>
/// <param name="sampleRateIn">The sample rate in.</param>
/// <param name="sampleRateOut">The sample rate out.</param>
/// <returns>
/// the number of samples processed
/// </returns>
public int Engage(float[] sourceFloats,
int sourceLength,
out float[] resampledResult,
int sampleRateIn,
int sampleRateOut)
{
// The resampler code is very delicate. I don't recommend messing with it unless you have a week to
// spend on it.
// See https://gist.github.com/markheath/dc41131fefb84b93b041f1dde8a08209 for more info
_resampler.SetMode(false, 0, false);
_resampler.SetFilterParms();
_resampler.SetRates(sampleRateIn, sampleRateOut);
_resampler.SetFeedMode(true); // input driven
float[] inData;
int inBufferOffset;
int inputFrameCount = sourceLength / _channels;
int framesExpected = _resampler.ResamplePrepare(inputFrameCount, _channels, out inData, out inBufferOffset);
// Feed the samples into the resampler's byte array.
Array.Copy(sourceFloats, 0, inData, inBufferOffset, framesExpected * _channels);
var ratio = (double)sampleRateIn / sampleRateOut;
double expected = (double)framesExpected * _channels / ratio;
// round upward to nearest complete frame to prevent data loss
int roundedSamples = (int)Math.Ceiling(expected / _channels) * _channels;
resampledResult = new float[roundedSamples];
// the return value is the Inverse of what would actually be helpful
int framesProcessed = _resampler.ResampleOut(resampledResult, 0, framesExpected, roundedSamples, _channels);
return(framesProcessed * 2);
}
/// <summary>
/// Reads from this sample provider
/// </summary>
public int Read(float[] buffer, int offset, int count)
{
float[] inBuffer;
int inBufferOffset;
int framesRequested = count / channels;
int inNeeded = resampler.ResamplePrepare(framesRequested, outFormat.Channels, out inBuffer, out inBufferOffset);
int inAvailable = source.Read(inBuffer, inBufferOffset, inNeeded * channels) / channels;
int outAvailable = resampler.ResampleOut(buffer, offset, inAvailable, framesRequested, channels);
return(outAvailable * channels);
}
private void DataAvailable(object sender, WaveInEventArgs e)
{
// WaveBuffer is broken.
//var buffer = new WaveBuffer(e.Buffer);
var buffer = new float[e.BytesRecorded / 4];
for (int i = 0; i < e.BytesRecorded; i += 4)
{
buffer[i / 4] = BitConverter.ToSingle(e.Buffer, i) * SpeakersVolumeSlider.Volume;
}
// This peak detection doesn't work correctly
{
float peakL = 0, peakR = 0;
for (int i = 0; i < buffer.Length; i += 2)
{
peakL += Math.Abs(buffer[i]);
}
for (int i = 1; i < buffer.Length; i += 2)
{
peakR += Math.Abs(buffer[i]);
}
SpeakersLeftChannel.Amplitude = peakL / (buffer.Length / 2);
SpeakersRightChannel.Amplitude = peakR / (buffer.Length / 2);
}
int framesAvailable = e.BytesRecorded * 8 / capture.WaveFormat.BitsPerSample / 2;
//Console.WriteLine("Got {0} samples per channel", framesAvailable);
float[] inBuffer;
int inBufferOffset;
int inNeeded = resampler.ResamplePrepare(framesAvailable, capture.WaveFormat.Channels, out inBuffer, out inBufferOffset);
Array.Copy(buffer, 0, inBuffer, inBufferOffset, inNeeded * 2);
float[] outBuffer = new float[framesAvailable * 4];
int outAvailable = resampler.ResampleOut(outBuffer, 0, inNeeded, framesAvailable * 2, outFormat.Channels);
//Console.WriteLine("Got {0} samples after resample", outAvailable);
for (int i = 0; i < framesAvailable * 2; i += 960)
{
var resampledDataTemp = outBuffer.Skip(i).Take(Math.Min(960, (outAvailable * 2 - i))).ToArray();
var resampledPaddedData = new float[960];
var output = new byte[1276];
Array.Copy(resampledDataTemp, resampledPaddedData, resampledDataTemp.Length);
int encoded = encoder.Encode(resampledPaddedData, 0, 480, output, 0, 1276);
SendData(output.Take(encoded).ToArray());
//Console.WriteLine("Encoded packet of {0} bytes", encoded);
// TODO: Send encoded data to the client
}
}
public bool Read(ArraySegment <float> samples)
{
var inFormat = _source.WaveFormat;
var outFormat = _outputFormat;
// Configure the rate of the resampler based on the requested playback rate.
// If rate adjustment is very small (<1%) play back at the base rate, this means
// in the normal case (rate=1) the rate won't be changing every frame
var outputRate = (double)outFormat.SampleRate;
if (Mathf.Abs(_rate.PlaybackRate - 1) > 0.01f)
{
outputRate = outFormat.SampleRate * (1 / _rate.PlaybackRate);
}
// ReSharper disable once CompareOfFloatsByEqualityOperator (justification: we want exact comparison)
if (outputRate != _resampler.OutputSampleRate)
{
Log.Trace("Changing resampler rate to {0}Hz", outputRate);
_resampler.SetRates(inFormat.SampleRate, outputRate);
}
var channels = inFormat.Channels;
// prepare buffers
float[] inBuffer;
int inBufferOffset;
var samplesPerChannelRequested = samples.Count / channels;
var samplesPerChannelRequired = _resampler.ResamplePrepare(samplesPerChannelRequested, channels, out inBuffer, out inBufferOffset);
var sourceBuffer = new ArraySegment <float>(inBuffer, inBufferOffset, samplesPerChannelRequired * channels);
// read source
var complete = _source.Read(sourceBuffer);
// resample
Log.Trace("Resampling {0}Hz -> {1}Hz", inFormat.SampleRate, outFormat.SampleRate);
_resampler.ResampleOut(samples.Array, samples.Offset, samplesPerChannelRequired, samplesPerChannelRequested, channels);
return(complete);
}
public bool Read(ArraySegment <float> samples)
{
var inFormat = _source.WaveFormat;
var outFormat = _outputFormat;
if (outFormat.SampleRate == inFormat.SampleRate)
{
return(_source.Read(samples));
}
if (_resampler == null || outFormat.SampleRate != (int)_resampler.OutputSampleRate)
{
Log.Debug("Initializing resampler to resample {0}Hz source to {1}Hz output", inFormat.SampleRate, outFormat.SampleRate);
_resampler = new WdlResampler();
_resampler.SetMode(true, 2, false);
_resampler.SetFilterParms();
_resampler.SetFeedMode(false); // output driven
_resampler.SetRates(inFormat.SampleRate, outFormat.SampleRate);
}
var channels = inFormat.Channels;
// prepare buffers
float[] inBuffer;
int inBufferOffset;
var samplesPerChannelRequested = samples.Count / channels;
var samplesPerChannelRequired = _resampler.ResamplePrepare(samplesPerChannelRequested, channels, out inBuffer, out inBufferOffset);
var sourceBuffer = new ArraySegment <float>(inBuffer, inBufferOffset, samplesPerChannelRequired * channels);
// read source
var complete = _source.Read(sourceBuffer);
// resample
Log.Trace("Resampling {0}Hz -> {1}Hz", inFormat.SampleRate, outFormat.SampleRate);
_resampler.ResampleOut(samples.Array, samples.Offset, samplesPerChannelRequired, samplesPerChannelRequested, channels);
return(complete);
}
