// Generate audioframes for the audiograph
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 * frameInputNode.EncodingProperties.BitsPerSample;
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)audioGraph.EncodingProperties.SampleRate;
double sampleIncrement = ((pitch*2*Math.PI)/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(i*sampleIncrement);
dataInFloat[i] = (float)sinValue;
}
}
return frame;
}
private void SendToSpeechTranslate(Windows.Media.AudioFrame frame)
{
this.viewModel.SpeechHelper.SendAudioFrame(frame);
}
private void SendAudioOut(Windows.Media.AudioFrame frame)
{
this.textToSpeechOutputNode.AddFrame(frame);
}
