unsafe internal AudioFrame GenerateAudioData(uint samples)
{
// Buffer size is (number of samples) * (size of each sample)
// We choose to generate single channel (mono) audio. For multi-channel, multiply by number of channels
uint bufferSize = samples * sizeof(float);
AudioFrame frame = new Windows.Media.AudioFrame(bufferSize);
using (AudioBuffer buffer = frame.LockBuffer(AudioBufferAccessMode.Write))
using (IMemoryBufferReference reference = buffer.CreateReference())
{
byte * dataInBytes;
uint capacityInBytes;
float *dataInFloat;
// Get the buffer from the AudioFrame
((IMemoryBufferByteAccess)reference).GetBuffer(out dataInBytes, out capacityInBytes);
// Cast to float since the data we are generating is float
dataInFloat = (float *)dataInBytes;
float amplitude = 0.3f;
int sampleRate = (int)parentGraph.EncodingProperties.SampleRate;
double sampleIncrement = (frequency * (Math.PI * 2)) / sampleRate;
// Generate a sine wave and populate the values in the memory buffer
for (int i = 0; i < samples; i++)
{
double sinValue = amplitude * Math.Sin(angle);
dataInFloat[i] = (float)sinValue;
angle += sampleIncrement;
}
}
return(frame);
}
private unsafe AudioFrame ReadAudioData(uint samples)
{
// Buffer size is (number of samples) * (size of each sample)
uint bufferSize = samples * sizeof(byte) * 2;
AudioFrame frame = new Windows.Media.AudioFrame(bufferSize);
using (AudioBuffer buffer = frame.LockBuffer(AudioBufferAccessMode.Write))
using (IMemoryBufferReference reference = buffer.CreateReference())
{
byte *dataInBytes;
uint capacityInBytes;
// Get the buffer from the AudioFrame
((IMemoryBufferByteAccess)reference).GetBuffer(out dataInBytes, out capacityInBytes);
// Read audio data from the stream and copy it to the AudioFrame buffer
var readBytes = new byte[capacityInBytes];
uint bytesRead = audioStream.Read(readBytes);
if (bytesRead == 0)
{
frameInputNode.Stop();
}
for (int i = 0; i < bytesRead; i++)
{
dataInBytes[i] = readBytes[i];
}
}
return(frame);
}
unsafe AudioFrame GenerateAudioData(byte[] readedData, uint audioDataLength)
{
AudioFrame frame = new Windows.Media.AudioFrame((uint)audioDataLength);
using (var buffer = frame.LockBuffer(AudioBufferAccessMode.Write))
using (IMemoryBufferReference reference = buffer.CreateReference())
{
byte *dataInBytes;
uint capacityInBytes;
((IMemoryBufferByteAccess)reference).GetBuffer(out dataInBytes, out capacityInBytes);
for (int i = 0; i < audioDataLength; i++)
{
dataInBytes[i] = readedData[i];
}
}
return(frame);
}
unsafe private AudioFrame GenerateAudioData(Int16[] samples)
{
uint bufferSize = (uint)samples.Length * sizeof(Int16);
AudioFrame frame = new Windows.Media.AudioFrame(bufferSize);
using (AudioBuffer buffer = frame.LockBuffer(AudioBufferAccessMode.Write))
using (IMemoryBufferReference reference = buffer.CreateReference())
{
byte * dataInBytes;
uint capacityInBytes;
Int16 *dataIn;
((IMemoryBufferByteAccess)reference).GetBuffer(out dataInBytes, out capacityInBytes);
// Cast to float since the data we are generating is float
dataIn = (Int16 *)dataInBytes;
for (var i = 0; i < samples.Length; i++)
{
dataIn[i] = samples[i];
}
}
return(frame);
}
public static VisualizationData AsVisualizationData(this Windows.Media.AudioFrame frame)
{
return(new VisualizationData(frame));
}
unsafe private AudioFrame GenerateAudioData(uint samples)
{
// Buffer size is (number of samples) * (size of each sample)
// We choose to generate single channel (mono) audio. For multi-channel, multiply by number of channels
uint bufferSize = samples * sizeof(float);
AudioFrame frame = new Windows.Media.AudioFrame(bufferSize);
using (AudioBuffer buffer = frame.LockBuffer(AudioBufferAccessMode.Write))
using (IMemoryBufferReference reference = buffer.CreateReference())
{
byte* dataInBytes;
uint capacityInBytes;
float* dataInFloat;
// Get the buffer from the AudioFrame
((IMemoryBufferByteAccess)reference).GetBuffer(out dataInBytes, out capacityInBytes);
// Cast to float since the data we are generating is float
dataInFloat = (float*)dataInBytes;
float freq = 1000; // choosing to generate frequency of 1kHz
float amplitude = 0.3f;
int sampleRate = (int)graph.EncodingProperties.SampleRate;
double sampleIncrement = (freq * (Math.PI * 2)) / sampleRate;
// Generate a 1kHz sine wave and populate the values in the memory buffer
for (int i = 0; i < samples; i++)
{
double sinValue = amplitude * Math.Sin(theta);
dataInFloat[i] = (float)sinValue;
theta += sampleIncrement;
}
}
return frame;
}
