/// <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="config">LAME configuration</param>
public LameMP3FileWriter(Stream outStream, WaveFormat format, LameConfig config)
: base()
{
if (format == null)
{
throw new ArgumentNullException("format");
}
// check for unsupported wave formats
if (format.Channels != 1 && format.Channels != 2)
{
throw new ArgumentException($"Unsupported number of channels {format.Channels}", "format");
}
if (format.Encoding != WaveFormatEncoding.Pcm && format.Encoding != WaveFormatEncoding.IeeeFloat)
{
throw new ArgumentException($"Unsupported encoding format {format.Encoding}", "format");
}
if (format.Encoding == WaveFormatEncoding.Pcm && format.BitsPerSample != 16)
{
throw new ArgumentException($"Unsupported PCM sample size {format.BitsPerSample}", "format");
}
if (format.Encoding == WaveFormatEncoding.IeeeFloat && format.BitsPerSample != 32)
{
throw new ArgumentException($"Unsupported Float sample size {format.BitsPerSample}", "format");
}
if (format.SampleRate < 8000 || format.SampleRate > 48000)
{
throw new ArgumentException($"Unsupported Sample Rate {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
_inputFormat = format;
_outStream = outStream ?? throw new ArgumentNullException("outStream");
_disposeOutput = false;
// Allocate buffers based on sample rate
_inBuffer = new ArrayUnion(format.AverageBytesPerSecond);
_outBuffer = new byte[format.SampleRate * 5 / 4 + 7200];
// Initialize lame library
_lame = config.ConfigureDLL(format);
if (config.ID3 != null)
{
ApplyID3Tag(config.ID3);
}
_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="config">LAME configuration</param>
public LameMP3FileWriter(string outFileName, WaveFormat format, LameConfig config)
: this(File.Create(outFileName), format, config)
{
_disposeOutput = true;
}
