/// <summary>
/// Decompress a single frame of MP3
/// </summary>
public int DecompressFrame(Mp3Frame frame, byte[] dest, int destOffset)
{
// 1. copy into our DMO's input buffer
inputMediaBuffer.LoadData(frame.RawData, frame.FrameLength);
if (reposition)
{
mp3Decoder.MediaObject.Flush();
reposition = false;
}
// 2. Give the input buffer to the DMO to process
mp3Decoder.MediaObject.ProcessInput(0, inputMediaBuffer, DmoInputDataBufferFlags.None, 0, 0);
outputBuffer.MediaBuffer.SetLength(0);
outputBuffer.StatusFlags = DmoOutputDataBufferFlags.None;
// 3. Now ask the DMO for some output data
mp3Decoder.MediaObject.ProcessOutput(DmoProcessOutputFlags.None, 1, new[] { outputBuffer });
if (outputBuffer.Length == 0)
{
NAudioLogger.Instance.LogWarning("ResamplerDmoStream.Read: No output data available");
return(0);
}
// 5. Now get the data out of the output buffer
outputBuffer.RetrieveData(dest, destOffset);
Debug.Assert(!outputBuffer.MoreDataAvailable, "have not implemented more data available yet");
return(outputBuffer.Length);
}
/// <summary>
/// Reads data from input stream
/// </summary>
/// <param name="buffer">buffer</param>
/// <param name="offset">offset into buffer</param>
/// <param name="count">Bytes required</param>
/// <returns>Number of bytes read</returns>
public override int Read(byte[] buffer, int offset, int count)
{
int outputBytesProvided = 0;
while (outputBytesProvided < count)
{
if (resampler.MediaObject.IsAcceptingData(0))
{
// 1. Read from the input stream
int inputBytesRequired = (int)OutputToInputPosition(count - outputBytesProvided);
byte[] inputByteArray = new byte[inputBytesRequired];
int inputBytesRead = inputStream.Read(inputByteArray, 0, inputBytesRequired);
if (inputBytesRead == 0)
{
Debug.WriteLine("ResamplerDmoStream.Read: No input data available");
break;
}
// 2. copy into our DMO's input buffer
inputMediaBuffer.LoadData(inputByteArray, inputBytesRead);
// 3. Give the input buffer to the DMO to process
resampler.MediaObject.ProcessInput(0, inputMediaBuffer, DmoInputDataBufferFlags.None, 0, 0);
outputBuffer.MediaBuffer.SetLength(0);
outputBuffer.StatusFlags = DmoOutputDataBufferFlags.None;
// 4. Now ask the DMO for some output data
resampler.MediaObject.ProcessOutput(DmoProcessOutputFlags.None, 1, new DmoOutputDataBuffer[] { outputBuffer });
if (outputBuffer.Length == 0)
{
Debug.WriteLine("ResamplerDmoStream.Read: No output data available");
break;
}
// 5. Now get the data out of the output buffer
outputBuffer.RetrieveData(buffer, offset + outputBytesProvided);
outputBytesProvided += outputBuffer.Length;
Debug.Assert(!outputBuffer.MoreDataAvailable, "have not implemented more data available yet");
}
else
{
Debug.Assert(false, "have not implemented not accepting logic yet");
}
}
position += outputBytesProvided;
return(outputBytesProvided);
}
