/// <summary>Create MP3FileWriter to write to supplied stream</summary>
/// <param name="outStream">Stream to write encoded data to</param>
/// <param name="format">Input Genode.Audio.WavFormat</param>
/// <param name="bitRate">Output bit rate in kbps</param>
/// <param name="id3">Optional ID3 data block</param>
public LameMP3FileWriter(Stream outStream, Cgen.Audio.WavFormat format, int bitRate, int channels = 2, int sampleRate = 44100, ID3TagData id3 = null)
: base()
{
// sanity check
if (outStream == null)
{
throw new ArgumentNullException("outStream");
}
// select encoder function that matches data format
if (format == Cgen.Audio.WavFormat.PCM)
{
if (channels == 1)
{
_encode = encode_pcm_16_mono;
}
else
{
_encode = encode_pcm_16_stereo;
}
}
else
{
if (channels == 1)
{
_encode = encode_float_mono;
}
else
{
_encode = encode_float_stereo;
}
}
// Set base properties
this.inputFormat = format;
this.outStream = outStream;
this.disposeOutput = false;
// Allocate buffers based on sample rate
this.channels = channels;
this.inBuffer = new ArrayUnion(sampleRate * channels * 2);
this.outBuffer = new byte[sampleRate * 5 / 4 + 7200];
// Initialize lame library
this._lame = new Lame.Wrapper.LibMp3Lame();
this._lame.InputSampleRate = sampleRate;
this._lame.NumChannels = channels;
this._lame.BitRate = bitRate;
if (id3 != null)
{
ApplyID3Tag(id3);
}
this._lame.InitParams();
}
// Close LAME instance and output stream on dispose
/// <summary>Dispose of object</summary>
/// <param name="final">True if called from destructor, false otherwise</param>
protected override void Dispose(bool final)
{
if (_lame != null && outStream != null)
{
Flush();
}
if (_lame != null)
{
_lame.Dispose();
_lame = null;
}
if (outStream != null && disposeOutput)
{
outStream.Dispose();
outStream = null;
}
base.Dispose(final);
}