static void Test_WaveWriter()
{
var format = new WaveFormat {
bytesPerSample = 2,
sampleRate = 44100,
channels = 1,
};
byte[] buffer = new byte[format.bytesPerSample * format.sampleRate]; // for 1 sec
string file = "test1.wav";
using (var w = new WaveWriter(format, file))
{
#if false
WaveFormat.Clear(buffer);
w.Write(buffer);
#else
var provider = new PartialProvider();
provider.Initialize(format);
//provider.AddFrequency(440.0, 1500, 0.5f); // without envelope
provider.AddPartial(440, 100, 2000, 0.5f, -4f);
provider.FlushPartials();
while (!provider.IsEmpty())
{
provider.Fill(buffer);
w.Write(buffer);
}
#endif
}
}
// implement SampleProvider
// PlayingThread.
public override bool Fill(byte[] buffer)
{
if (IsEmpty()) // No partials to play
{
WaveFormat.Clear(buffer);
return(true);
}
int bufferPos = 0; // in bytes
int bufferSampleCount = buffer.Length / _format.bytesPerSample;
for (int i = 0; i < bufferSampleCount / _format.channels; ++i)
{
// Add new partials: _addPartials -> _partials
if ((_currentSample & 0xFFF) == 0) // don't lock every sample
{
if (_addPartialsCount > 0) // atomic
{
lock (_addPartialsLock) {
for (int j = 0; j < _addPartialsCount; ++j)
{
_addPartials[j].SetTime(_currentSample);
//Debug.WriteLine("Partial added: {0}", _addPartials[j]);
}
Array.Copy(_addPartials, 0, _partials, _partialCount, _addPartialsCount);
_partialCount += _addPartialsCount;
_addPartialsCount = 0;
}
//Debug.WriteLine("Partials count: {0}", _partialCount);
}
}
int sampleValue = 0;
if (_partialCount > 0)
{
int c = 0; // current partial index
for (int j = 0; j < _partialCount; ++j)
{
// Removing ended partials
if (_partials[j].end == _currentSample)
{
//Debug.WriteLine("Partial removed: {0}", _partials[j]);
}
else
{
if (c != j)
{
_partials[c] = _partials[j];
}
// Get sample value
sampleValue += _partials[c].partial.GetNextValue();
c += 1;
}
}
if (_partialCount != c)
{
_partialCount = c;
//Debug.WriteLine("Partials count: {0}", _partialCount);
}
}
unchecked {
_currentSample += 1; // overflowing
}
// Write sample value to all channels
for (int c = 0; c < _format.channels; ++c)
{
_format.WriteInt(buffer, bufferPos, sampleValue);
bufferPos += _format.bytesPerSample;
}
}
//Debug.WriteLine(FormatBuffer(buffer));
return(true);
}
