/// <summary>Create MP3FileWriter to write to supplied stream</summary>
/// <param name="outStream">Stream to write encoded data to</param>
/// <param name="format">Input WaveFormat</param>
/// <param name="quality">LAME quality preset</param>
/// <param name="id3">Optional ID3 data block</param>
public LameMP3FileWriter(Stream outStream, WaveFormat format, NAudio.Lame.LAMEPreset quality, ID3TagData id3 = null)
: base()
{
Loader.Init();
//if (!Loader.Initialized)
// Loader.Initialized = false;
// sanity check
if (outStream == null)
{
throw new ArgumentNullException("outStream");
}
if (format == null)
{
throw new ArgumentNullException("format");
}
// check for unsupported wave formats
if (format.Channels != 1 && format.Channels != 2)
{
throw new ArgumentException(string.Format("Unsupported number of channels {0}", format.Channels), "format");
}
if (format.Encoding != WaveFormatEncoding.Pcm && format.Encoding != WaveFormatEncoding.IeeeFloat)
{
throw new ArgumentException(string.Format("Unsupported encoding format {0}", format.Encoding.ToString()), "format");
}
if (format.Encoding == WaveFormatEncoding.Pcm && format.BitsPerSample != 16)
{
throw new ArgumentException(string.Format("Unsupported PCM sample size {0}", format.BitsPerSample), "format");
}
if (format.Encoding == WaveFormatEncoding.IeeeFloat && format.BitsPerSample != 32)
{
throw new ArgumentException(string.Format("Unsupported Float sample size {0}", format.BitsPerSample), "format");
}
if (format.SampleRate < 8000 || format.SampleRate > 48000)
{
throw new ArgumentException(string.Format("Unsupported Sample Rate {0}", format.SampleRate), "format");
}
// select encoder function that matches data format
if (format.Encoding == WaveFormatEncoding.Pcm)
{
if (format.Channels == 1)
{
_encode = encode_pcm_16_mono;
}
else
{
_encode = encode_pcm_16_stereo;
}
}
else
{
if (format.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.inBuffer = new ArrayUnion(format.AverageBytesPerSecond);
this.outBuffer = new byte[format.SampleRate * 5 / 4 + 7200];
// Initialize lame library
this._lame = new LibMp3Lame();
this._lame.InputSampleRate = format.SampleRate;
this._lame.NumChannels = format.Channels;
this._lame.SetPreset((int)quality);
if (id3 != null)
{
ApplyID3Tag(id3);
}
this._lame.InitParams();
}
/// <summary>Create MP3FileWriter to write to a file on disk</summary>
/// <param name="outFileName">Name of file to create</param>
/// <param name="format">Input WaveFormat</param>
/// <param name="quality">LAME quality preset</param>
/// <param name="id3">Optional ID3 data block</param>
public LameMP3FileWriter(string outFileName, WaveFormat format, NAudio.Lame.LAMEPreset quality, ID3TagData id3 = null)
: this(File.Create(outFileName), format, quality, id3)
{
this.disposeOutput = true;
}
