private void initialize(Header header)
{
// REVIEW: allow customizable scale factor
float scalefactor = 32700.0f;
int mode = header.mode();
int layer = header.layer();
int channels = mode == Header.SINGLE_CHANNEL?1:2;
// set up output buffer if not set up by client.
if (output == null)
{
output = new SampleBuffer(header.frequency(), channels);
}
float[] factors = equalizer.BandFactors;
//Console.WriteLine("NOT CREATING SYNTHESIS FILTERS");
filter1 = new SynthesisFilter(0, scalefactor, factors);
// REVIEW: allow mono output for stereo
if (channels == 2)
{
filter2 = new SynthesisFilter(1, scalefactor, factors);
}
outputChannels = channels;
outputFrequency = header.frequency();
initialized = true;
}
/// <summary> Decodes one frame from an MPEG audio bitstream.
///
/// </summary>
/// <param name="header The">header describing the frame to decode.
/// </param>
/// <param name="bitstream The">bistream that provides the bits for te body of the frame.
///
/// </param>
/// <returns> A SampleBuffer containing the decoded samples.
///
/// </returns>
public virtual Obuffer decodeFrame(Header header, Bitstream stream)
{
if (!initialized)
{
initialize(header);
}
int layer = header.layer();
output.clear_buffer();
FrameDecoder decoder = retrieveDecoder(header, stream, layer);
decoder.decodeFrame();
output.write_buffer(1);
return(output);
}
private void initialize(Header header)
{
// REVIEW: allow customizable scale factor
float scalefactor = 32700.0f;
int mode = header.mode();
int layer = header.layer();
int channels = mode == Header.SINGLE_CHANNEL?1:2;
// set up output buffer if not set up by client.
if (output == null)
output = new SampleBuffer(header.frequency(), channels);
float[] factors = equalizer.BandFactors;
//Console.WriteLine("NOT CREATING SYNTHESIS FILTERS");
filter1 = new SynthesisFilter(0, scalefactor, factors);
// REVIEW: allow mono output for stereo
if (channels == 2)
filter2 = new SynthesisFilter(1, scalefactor, factors);
outputChannels = channels;
outputFrequency = header.frequency();
initialized = true;
}
/// <summary> Decodes one frame from an MPEG audio bitstream.
///
/// </summary>
/// <param name="header The">header describing the frame to decode.
/// </param>
/// <param name="bitstream The">bistream that provides the bits for te body of the frame.
///
/// </param>
/// <returns> A SampleBuffer containing the decoded samples.
///
/// </returns>
public virtual Obuffer decodeFrame(Header header, Bitstream stream)
{
if (!initialized)
{
initialize(header);
}
int layer = header.layer();
output.clear_buffer();
FrameDecoder decoder = retrieveDecoder(header, stream, layer);
decoder.decodeFrame();
output.write_buffer(1);
return output;
}
