static SpeexResampler()
{
var resolver = new DynamicLibraryImportResolver(
OSTailoredCode.IsUnixHost ? "libspeexdsp.so.1" : "libspeexdsp.dll", hasLimitedLifetime: false);
NativeDSP = BizInvoker.GetInvoker <LibSpeexDSP>(resolver, CallingConventionAdapters.Native);
}
public void Dispose()
{
if (st != IntPtr.Zero)
{
LibSpeexDSP.speex_resampler_destroy(st);
st = IntPtr.Zero;
GC.SuppressFinalize(this);
}
}
/// <summary>flush as many input samples as possible, generating output samples right now</summary>
/// <exception cref="Exception">unmanaged call failed</exception>
public void Flush()
{
uint inal = (uint)_inbufpos / 2;
uint outal = (uint)_outbuf.Length / 2;
LibSpeexDSP.speex_resampler_process_interleaved_int(_st, _inbuf, ref inal, _outbuf, ref outal);
// reset inbuf
if (inal != _inbufpos / 2)
{
throw new Exception("Speexresampler didn't eat the whole array?");
}
_inbufpos = 0;
_drainer(_outbuf, (int)outal);
}
/// <summary>
/// flush as many input samples as possible, generating output samples right now
/// </summary>
public void Flush()
{
uint inal = (uint)inbufpos / 2;
uint outal = (uint)outbuf.Length / 2;
LibSpeexDSP.speex_resampler_process_interleaved_int(st, inbuf, ref inal, outbuf, ref outal);
// reset inbuf
if (inal != inbufpos / 2)
{
throw new Exception("Speexresampler didn't eat the whole array?");
}
inbufpos = 0;
//Buffer.BlockCopy(inbuf, (int)inal * 2 * sizeof(short), inbuf, 0, inbufpos - (int)inal * 2);
//inbufpos -= (int)inal * 2;
// dispatch outbuf
drainer(outbuf, (int)outal);
}
/// <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];
}
/// <summary>change sampling rate on the fly</summary>
/// <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>
public void ChangeRate(uint rationum, uint ratioden, uint sratein, uint srateout)
{
CheckError(LibSpeexDSP.speex_resampler_set_rate_frac(st, rationum, ratioden, sratein, srateout));
outbuf = new short[inbuf.Length * ratioden / rationum / 2 * 2 + 128];
}
public void Dispose()
{
LibSpeexDSP.speex_resampler_destroy(st);
st = IntPtr.Zero;
}
