public VoipCodecSpeex(BandMode bandMode, int sampleRate, string description, VoipCodecMode mode = VoipCodecMode.Both)
{
_bandMode = bandMode;
_recordingFormat = new WaveFormat(sampleRate, 16, 1);
_description = description;
if (mode.HasFlag(VoipCodecMode.Decode))
_decoder = new SpeexDecoder(bandMode);
if (mode.HasFlag(VoipCodecMode.Encode))
{
_encoder = new SpeexEncoder(bandMode);
_outputBufferTemp = new byte[_recordingFormat.AverageBytesPerSecond];
_encoderInputBuffer = new WaveBuffer(_recordingFormat.AverageBytesPerSecond); // more than enough
}
}
public IVoipCodec Duplicate(VoipCodecMode mode)
{
return new VoipCodecOpus(_recordingFormat.SampleRate, _bitrate, _description, mode);
}
public IVoipCodec Duplicate(VoipCodecMode mode)
{
return new VoipCodecSpeex(_bandMode, _recordingFormat.SampleRate, _description, mode);
}
public VoipCodecOpus(int sampleRate, int bitrate, string description, VoipCodecMode mode = VoipCodecMode.Both)
{
_bitrate = bitrate;
_segmentLength = sampleRate / 25;// 2 bytes per sample, 20ms per segment
_recordingFormat = new WaveFormat(sampleRate, 16, 1);
_description = description;
if (mode.HasFlag(VoipCodecMode.Decode))
_decoder = OpusDecoder.Create(sampleRate, 1);
if (mode.HasFlag(VoipCodecMode.Encode))
{
_encoder = OpusEncoder.Create(sampleRate, 1, OpusAPI.Application.Voip);
// 16kHz sample rate is 32kB/s raw.
// Compressed bitrates:
// 32768 is 4kB/s
// 24800 is 3kB/s (3100B/s, same as Speex 16kHz)
// 8192 is 1kB/s
_encoder.Bitrate = bitrate;
_encoderInputBuffer = new byte[_recordingFormat.AverageBytesPerSecond]; // more than enough
}
}
