/// <summary>
/// WaveStream to resample using the DMO Resampler
/// </summary>
/// <param name="inputProvider">Input Stream</param>
/// <param name="outputFormat">Desired Output Format</param>
public ResamplerDmoStream(IWaveProvider inputProvider, WaveFormat outputFormat)
{
this.inputProvider = inputProvider;
this.inputStream = inputProvider as WaveStream;
this.outputFormat = outputFormat;
this.resampler = new Resampler();
if (!resampler.MediaObject.SupportsInputWaveFormat(0, inputProvider.WaveFormat))
{
throw new ArgumentException("Unsupported Input Stream format", "inputStream");
}
resampler.MediaObject.SetInputWaveFormat(0, inputProvider.WaveFormat);
if (!resampler.MediaObject.SupportsOutputWaveFormat(0, outputFormat))
{
throw new ArgumentException("Unsupported Output Stream format", "outputStream");
}
resampler.MediaObject.SetOutputWaveFormat(0, outputFormat);
if (inputStream != null)
{
position = InputToOutputPosition(inputStream.Position);
}
this.inputMediaBuffer = new MediaBuffer(inputProvider.WaveFormat.AverageBytesPerSecond);
this.outputBuffer = new DmoOutputDataBuffer(outputFormat.AverageBytesPerSecond);
}
/// <summary>
/// Initializes a new instance of the DMO MP3 Frame decompressor
/// </summary>
/// <param name="sourceFormat"></param>
public DmoMp3FrameDecompressor(WaveFormat sourceFormat)
{
this.mp3Decoder = new WindowsMediaMp3Decoder();
if (!mp3Decoder.MediaObject.SupportsInputWaveFormat(0, sourceFormat))
{
throw new ArgumentException("Unsupported input format");
}
mp3Decoder.MediaObject.SetInputWaveFormat(0, sourceFormat);
pcmFormat = new WaveFormat(sourceFormat.SampleRate, sourceFormat.Channels); // 16 bit
if (!mp3Decoder.MediaObject.SupportsOutputWaveFormat(0, pcmFormat))
{
throw new ArgumentException(String.Format("Unsupported output format {0}", pcmFormat));
}
mp3Decoder.MediaObject.SetOutputWaveFormat(0, pcmFormat);
// a second is more than enough to decompress a frame at a time
inputMediaBuffer = new MediaBuffer(sourceFormat.AverageBytesPerSecond);
outputBuffer = new DmoOutputDataBuffer(pcmFormat.AverageBytesPerSecond);
}
public void ResamplerCanCallProcessOutput()
{
Resampler resampler = new Resampler();
WaveFormat inputFormat = WaveFormat.CreateIeeeFloatWaveFormat(44100, 2);
WaveFormat outputFormat = WaveFormat.CreateIeeeFloatWaveFormat(48000, 2);
resampler.MediaObject.SetInputWaveFormat(0, inputFormat);
resampler.MediaObject.SetOutputWaveFormat(0, outputFormat);
resampler.MediaObject.AllocateStreamingResources();
using (MediaBuffer inputBuffer = new MediaBuffer(inputFormat.AverageBytesPerSecond))
{
inputBuffer.Length = inputFormat.AverageBytesPerSecond / 10;
Debug.WriteLine(String.Format("Input Length {0}", inputBuffer.Length));
resampler.MediaObject.ProcessInput(0, inputBuffer, DmoInputDataBufferFlags.None, 0, 0);
Debug.WriteLine(String.Format("Input Length {0}", inputBuffer.Length));
Debug.WriteLine(String.Format("Input Lookahead {0}", resampler.MediaObject.GetInputSizeInfo(0).MaxLookahead));
//Debug.WriteLine(String.Format("Input Max Latency {0}", resampler.MediaObject.GetInputMaxLatency(0)));
using (DmoOutputDataBuffer outputBuffer = new DmoOutputDataBuffer(outputFormat.AverageBytesPerSecond))
{
// one buffer for each output stream
resampler.MediaObject.ProcessOutput(DmoProcessOutputFlags.None, 1, new DmoOutputDataBuffer[] { outputBuffer });
Debug.WriteLine(String.Format("Converted length: {0}", outputBuffer.Length));
Debug.WriteLine(String.Format("Converted flags: {0}", outputBuffer.StatusFlags));
//Assert.AreEqual((int)(inputBuffer.Length * 48000.0 / inputFormat.SampleRate), outputBuffer.Length, "Converted buffer length");
}
using (DmoOutputDataBuffer outputBuffer = new DmoOutputDataBuffer(48000 * 2 * 4))
{
// one buffer for each output stream
resampler.MediaObject.ProcessOutput(DmoProcessOutputFlags.None, 1, new DmoOutputDataBuffer[] { outputBuffer });
Debug.WriteLine(String.Format("Converted length: {0}", outputBuffer.Length));
Debug.WriteLine(String.Format("Converted flags: {0}", outputBuffer.StatusFlags));
//Assert.AreEqual((int)(inputBuffer.Length * 48000.0 / inputFormat.SampleRate), outputBuffer.Length, "Converted buffer length");
}
}
resampler.MediaObject.FreeStreamingResources();
}
/// <summary>
/// Process Output
/// </summary>
/// <param name="flags">Flags</param>
/// <param name="outputBufferCount">Output buffer count</param>
/// <param name="outputBuffers">Output buffers</param>
public void ProcessOutput(DmoProcessOutputFlags flags, int outputBufferCount, DmoOutputDataBuffer[] outputBuffers)
{
int reserved;
Marshal.ThrowExceptionForHR(mediaObject.ProcessOutput(flags, outputBufferCount, outputBuffers, out reserved));
}
