/// <summary>
/// Produces PCM samples from Opus encoded data.
/// </summary>
/// <param name="inputOpusData">Opus encoded data to decode, null for dropped packet.</param>
/// <param name="dataLength">Length of data to decode.</param>
/// <param name="decodedLength">Set to the length of the decoded sample data.</param>
/// <returns>PCM audio samples.</returns>
public unsafe void DecodeFloat(ReadOnlySpan <byte> inputOpusData, Span <float> outputFloat, out int dataLength)
{
if (disposed)
{
throw new ObjectDisposedException("OpusDecoder");
}
int frameCount = GetSamples(inputOpusData) * OutputChannels;
int length;
fixed(byte *inputPtr = inputOpusData)
fixed(float *outputPtr = outputFloat)
{
if (inputOpusData != null)
{
length = OpusAPI.opus_decode_float(DecoderInstance, inputPtr, inputOpusData.Length, outputPtr, frameCount, 0);
}
else
{
length = OpusAPI.opus_decode_float(DecoderInstance, null, 0, outputPtr, frameCount, (ForwardErrorCorrection) ? 1 : 0);
}
}
if (length < 0)
{
throw new Exception("Decoding failed - " + (Errors)length);
}
dataLength = length * OutputChannels;
}
/// <summary>
/// Produces PCM samples from Opus encoded data.
/// </summary>
/// <param name="inputOpusData">Opus encoded data to decode, null for dropped packet.</param>
/// <param name="dataLength">Length of data to decode.</param>
/// <param name="decodedLength">Set to the length of the decoded sample data.</param>
/// <returns>PCM audio samples.</returns>
public unsafe byte[] Decode(Span <byte> inputOpusData, int dataLength, out int decodedLength)
{
if (disposed)
{
throw new ObjectDisposedException("OpusDecoder");
}
int frameCount = MaxDataBytes * OutputChannels;
byte[] decoded = new byte[frameCount * 2];
int length = 0;
fixed(byte *inputPtr = inputOpusData)
fixed(byte *outputPtr = decoded)
{
if (inputOpusData != null)
{
length = OpusAPI.opus_decode(DecoderInstance, inputPtr, dataLength, outputPtr, frameCount, 0);
}
else
{
length = OpusAPI.opus_decode(DecoderInstance, null, 0, outputPtr, frameCount, (ForwardErrorCorrection) ? 1 : 0);
}
decodedLength = length * 2 * OutputChannels;
if (length < 0)
{
throw new Exception("Decoding failed - " + ((Errors)length));
}
return(decoded);
}
}
/// <summary>
/// Produces PCM samples from Opus encoded data.
/// </summary>
/// <param name="inputOpusData">Opus encoded data to decode, null for dropped packet.</param>
/// <param name="dataLength">Length of data to decode.</param>
/// <param name="decodedLength">Set to the length of the decoded sample data.</param>
/// <returns>PCM audio samples.</returns>
public unsafe float[] DecodeFloat(ReadOnlySpan <byte> inputOpusData)
{
if (disposed)
{
throw new ObjectDisposedException("OpusDecoder");
}
int frameCount = GetSamples(inputOpusData) * OutputChannels;
float[] decoded = new float[frameCount];
int length = 0;
fixed(byte *inputPtr = inputOpusData)
fixed(float *outputPtr = decoded)
{
if (inputOpusData != null)
{
length = OpusAPI.opus_decode_float(DecoderInstance, inputPtr, inputOpusData.Length, outputPtr, frameCount, 0);
}
else
{
length = OpusAPI.opus_decode_float(DecoderInstance, null, 0, outputPtr, frameCount, (ForwardErrorCorrection) ? 1 : 0);
}
}
if (length < 0)
{
throw new Exception("Decoding failed - " + (Errors)length);
}
//decodedCount = length * OutputChannels;
Array.Resize(ref decoded, length * OutputChannels);
return(decoded);
}
/// <summary>
/// Creates a new Opus decoder.
/// </summary>
/// <param name="outputSampleRate">Sample rate to decode at (Hz). This must be one of 8000, 12000, 16000, 24000, or 48000.</param>
/// <param name="outputChannels">Number of channels to decode.</param>
/// <returns>A new <c>OpusDecoder</c>.</returns>
public static OpusDecoder Create(int outputSampleRate, int outputChannels)
{
if (outputSampleRate != 8000 &&
outputSampleRate != 12000 &&
outputSampleRate != 16000 &&
outputSampleRate != 24000 &&
outputSampleRate != 48000)
{
throw new ArgumentOutOfRangeException(nameof(outputSampleRate));
}
if (outputChannels != 1 && outputChannels != 2)
{
throw new ArgumentOutOfRangeException(nameof(outputChannels));
}
IntPtr decoder = OpusAPI.opus_decoder_create(outputSampleRate, outputChannels, out var error);
if ((Errors)error != Errors.OK)
{
throw new Exception("Exception occured while creating decoder");
}
return(new OpusDecoder(decoder, outputSampleRate, outputChannels));
}
/// <summary>
/// Produces Opus encoded audio from PCM samples.
/// </summary>
/// <param name="inputPcmSamples">PCM samples to encode.</param>
/// <param name="sampleLength">How many samples to encode.</param>
/// <param name="encodedLength">Set to length of encoded audio.</param>
/// <returns>Opus encoded audio buffer.</returns>
public unsafe void Encode(ReadOnlySpan <float> inputPcmSamples, Span <byte> outputSpan, int sampleLength, out int encodedLength)
{
if (disposed)
{
throw new ObjectDisposedException("OpusEncoder");
}
int length = 0;
fixed(float *inputPtr = inputPcmSamples)
fixed(byte *outputPtr = outputSpan)
{
length = OpusAPI.opus_encode_float(EncoderInstance, inputPtr, sampleLength, outputPtr, outputSpan.Length);
}
encodedLength = length;
if (length < 0)
{
var exception = new Exception("Encoding failed - " + (Errors)length);
exception.Data.Add("inputPcmSamples.Length", inputPcmSamples.Length);
exception.Data.Add("sampleLength", sampleLength);
exception.Data.Add("InputChannels", InputChannels);
throw exception;
}
}
/// <summary>
/// Produces Opus encoded audio from PCM samples.
/// </summary>
/// <param name="inputPcmSamples">PCM samples to encode.</param>
/// <param name="sampleLength">How many bytes to encode.</param>
/// <param name="encodedLength">Set to length of encoded audio.</param>
/// <returns>Opus encoded audio buffer.</returns>
public unsafe byte[] Encode(Span <byte> inputPcmSamples, int sampleLength, out int encodedLength)
{
if (disposed)
{
throw new ObjectDisposedException("OpusEncoder");
}
int maxDataBytes = sampleLength * InputChannels * sizeof(short);
byte[] encoded = new byte[maxDataBytes];
int length = 0;
fixed(byte *inputPtr = inputPcmSamples)
fixed(byte *outputPtr = encoded)
{
length = OpusAPI.opus_encode(EncoderInstance, inputPtr, sampleLength, outputPtr, maxDataBytes);
}
encodedLength = length;
if (length < 0)
{
var exception = new Exception("Encoding failed - " + (Errors)length);
exception.Data.Add("inputPcmSamples.Length", inputPcmSamples.Length.ToString());
exception.Data.Add("sampleLength", sampleLength.ToString());
exception.Data.Add("MaxDataBytes", maxDataBytes.ToString());
throw exception;
}
return(encoded);
}
/// <summary>
/// Creates a new Opus encoder.
/// </summary>
/// <param name="inputSamplingRate">Sampling rate of the input signal (Hz). This must be one of 8000, 12000, 16000, 24000, or 48000.</param>
/// <param name="inputChannels">Number of channels (1 or 2) in input signal.</param>
/// <param name="application">Coding mode.</param>
/// <returns>A new <c>OpusEncoder</c></returns>
public static OpusEncoder Create(int inputSamplingRate, int inputChannels, Application application)
{
if (inputSamplingRate != 8000 &&
inputSamplingRate != 12000 &&
inputSamplingRate != 16000 &&
inputSamplingRate != 24000 &&
inputSamplingRate != 48000)
{
throw new ArgumentOutOfRangeException(nameof(inputSamplingRate));
}
if (inputChannels != 1 && inputChannels != 2)
{
throw new ArgumentOutOfRangeException(nameof(inputChannels));
}
IntPtr encoder = OpusAPI.opus_encoder_create(inputSamplingRate, inputChannels, (int)application, out var error);
if ((Errors)error != Errors.OK)
{
throw new Exception("Exception occured while creating encoder");
}
return(new OpusEncoder(encoder, inputSamplingRate, inputChannels, application));
}
private void SetCtl(Ctl ctl, int value)
{
if (disposed)
{
throw new ObjectDisposedException("OpusEncoder");
}
var ret = OpusAPI.opus_encoder_ctl(EncoderInstance, ctl, value);
if (ret < 0)
{
throw new Exception("Encoder error - " + (Errors)ret);
}
}
private int GetCtl(Ctl ctl)
{
if (disposed)
{
throw new ObjectDisposedException("OpusEncoder");
}
var ret = OpusAPI.opus_encoder_ctl_out(EncoderInstance, ctl, out int result);
if (ret < 0)
{
throw new Exception("Encoder error - " + (Errors)ret);
}
return(result);
}
public void Dispose()
{
if (disposed)
{
return;
}
GC.SuppressFinalize(this);
if (DecoderInstance != IntPtr.Zero)
{
OpusAPI.opus_decoder_destroy(DecoderInstance);
DecoderInstance = IntPtr.Zero;
}
disposed = true;
}
public unsafe int GetSamples(ReadOnlySpan <byte> data)
{
fixed(byte *ptr = data)
return(OpusAPI.opus_packet_get_nb_samples(ptr, data.Length, OutputSamplingRate));
}
public unsafe int GetFrames(byte[] data)
{
fixed(byte *ptr = data)
return(OpusAPI.opus_packet_get_nb_frames(ptr, data.Length));
}
public unsafe int GetChannels(byte[] data)
{
fixed(byte *ptr = data)
return(OpusAPI.opus_packet_get_nb_channels(ptr));
}