static unsafe SoftwareBitmap ColorizeMelspectrogram(SoftwareBitmap bwSpectrogram)
{
using (BitmapBuffer buffer = bwSpectrogram.LockBuffer(BitmapBufferAccessMode.Write))
{
using var reference = buffer.CreateReference();
IMemoryBufferByteAccess memoryBuffer = reference.As <IMemoryBufferByteAccess>();
memoryBuffer.GetBuffer(out byte *dataInBytes, out uint capacity);
// Edit the BGRA Plane
BitmapPlaneDescription bufferLayout = buffer.GetPlaneDescription(0);
for (int i = 0; i < bufferLayout.Height; i++)
{
for (int j = 0; j < bufferLayout.Width; j++)
{
int pixel = bufferLayout.StartIndex + bufferLayout.Stride * i + 4 * j;
//Lines below can be tweaked for different custom color filters
//Blue
dataInBytes[pixel + 0] = (byte)((255 - dataInBytes[pixel + 0]) / 2);
//Green
dataInBytes[pixel + 1] = (byte)(dataInBytes[pixel + 1] / 2);
//Red
//dataInBytes[pixel + 2] = (byte)(dataInBytes[pixel + 2]);
//Alpha - must leave each pixel at max
dataInBytes[bufferLayout.StartIndex + bufferLayout.Stride * i + 4 * j + 3] = (byte)255;
}
}
}
return(bwSpectrogram);
}
//unsafe private void M_AudioGraph_QuantumProcessed(AudioGraph sender, object args)
//{
//}
unsafe private void M_AudioGraph_QuantumStarted(AudioGraph sender, object args)
{
// draw every n frames
//if (fctr++ % 5 == 0)
//{
using (AudioFrame audioFrame = this.m_AudioFrameOutputNode.GetFrame())
using (AudioBuffer audioBuffer = audioFrame.LockBuffer(AudioBufferAccessMode.Read))
using (IMemoryBufferReference memBufferRef = audioBuffer.CreateReference())
{
IMemoryBufferByteAccess byteAccess = memBufferRef as IMemoryBufferByteAccess;
byte *byteBuffer;
uint capacity;
byteAccess.GetBuffer(out byteBuffer, out capacity);
float *floatBuffer = (float *)byteBuffer;
for (int i = 0; i < this.m_AudioGraph.SamplesPerQuantum * this.m_AudioGraph.EncodingProperties.ChannelCount; i++)
{
this.m_QuantumSamples[i] = floatBuffer[i];
}
this.m_Capacity = capacity;
this.m_abCap = audioBuffer.Capacity;
this.m_abLen = audioBuffer.Length;
}
AudioCanvas.Invalidate();
//}
}
public BufferMemoryManager(IMemoryBuffer buffer)
{
reference = buffer?.CreateReference() ?? throw new ArgumentNullException(nameof(buffer));
if (reference is IMemoryBufferByteAccess)
{
byteAccess = (IMemoryBufferByteAccess)reference;
}
else
{
reference.Dispose();
throw new ArgumentException("buffer does not implment IMemoryBufferByteAccess");
}
}
