private static void CheckError(LibSpeexDSP.RESAMPLER_ERR e)
{
switch (e)
{
case LibSpeexDSP.RESAMPLER_ERR.SUCCESS:
return;
case LibSpeexDSP.RESAMPLER_ERR.ALLOC_FAILED:
throw new InsufficientMemoryException($"{nameof(LibSpeexDSP)}: Alloc failed");
case LibSpeexDSP.RESAMPLER_ERR.BAD_STATE:
throw new Exception($"{nameof(LibSpeexDSP)}: Bad state");
case LibSpeexDSP.RESAMPLER_ERR.INVALID_ARG:
throw new ArgumentException($"{nameof(LibSpeexDSP)}: Bad Argument");
case LibSpeexDSP.RESAMPLER_ERR.PTR_OVERLAP:
throw new Exception($"{nameof(LibSpeexDSP)}: Buffers cannot overlap");
}
}
/// <summary>
///
/// </summary>
/// <param name="quality">0 to 10</param>
/// <param name="rationum">numerator of srate change ratio (inrate / outrate)</param>
/// <param name="ratioden">demonenator of srate change ratio (inrate / outrate)</param>
/// <param name="sratein">sampling rate in, rounded to nearest hz</param>
/// <param name="srateout">sampling rate out, rounded to nearest hz</param>
/// <param name="drainer">function which accepts output as produced. if null, act as an ISyncSoundProvider</param>
/// <param name="input">source to take input from when output is requested. if null, no autofetching</param>
public SpeexResampler(int quality, uint rationum, uint ratioden, uint sratein, uint srateout, Action <short[], int> drainer = null, ISoundProvider input = null)
{
if (drainer != null && input != null)
{
throw new ArgumentException("Can't autofetch without being an ISyncSoundProvider?");
}
LibSpeexDSP.RESAMPLER_ERR err = LibSpeexDSP.RESAMPLER_ERR.SUCCESS;
st = LibSpeexDSP.speex_resampler_init_frac(2, rationum, ratioden, sratein, srateout, quality, ref err);
if (st == IntPtr.Zero)
{
throw new Exception("LibSpeexDSP returned null!");
}
CheckError(err);
this.drainer = drainer ?? InternalDrain;
this.input = input;
outbuf = new short[inbuf.Length * ratioden / rationum / 2 * 2 + 128];
}
/// <summary>
/// Initializes a new instance of the <see cref="SpeexResampler"/> class
/// </summary>
/// <param name="quality">0 to 10</param>
/// <param name="rationum">numerator of sample rate change ratio (inrate / outrate)</param>
/// <param name="ratioden">denominator of sample rate change ratio (inrate / outrate)</param>
/// <param name="sratein">sampling rate in, rounded to nearest hz</param>
/// <param name="srateout">sampling rate out, rounded to nearest hz</param>
/// <param name="drainer">function which accepts output as produced. if null, act as an <seealso cref="ISoundProvider"/></param>
/// <param name="input">source to take input from when output is requested. if null, no auto-fetching</param>
public SpeexResampler(Quality quality, uint rationum, uint ratioden, uint sratein, uint srateout, Action <short[], int> drainer = null, ISoundProvider input = null)
{
if (drainer != null && input != null)
{
throw new ArgumentException($"Can't autofetch without being an {nameof(ISoundProvider)}?");
}
LibSpeexDSP.RESAMPLER_ERR err = LibSpeexDSP.RESAMPLER_ERR.SUCCESS;
_st = LibSpeexDSP.speex_resampler_init_frac(2, rationum, ratioden, sratein, srateout, quality, ref err);
if (_st == IntPtr.Zero)
{
throw new Exception($"{nameof(LibSpeexDSP)} returned null!");
}
CheckError(err);
_drainer = drainer ?? InternalDrain;
_input = input;
_outbuf = new short[(_inbuf.Length * ratioden / rationum / 2 * 2) + 128];
}
