/// <summary>Initializes a new instance of the <see cref="PAOut"/> class.</summary>
/// <param name="dev">The device to use.</param>
/// <param name="configuration">The configuration to use.</param>
/// <exception cref="NotSupportedException">
/// </exception>
/// <exception cref="Exception"></exception>
internal PAOut(IAudioDevice dev, IAudioConfiguration configuration)
: base(dev, configuration)
{
var l_OutputParameters = new PAStreamParameters();
switch (configuration.ChannelSetup)
{
case AudioChannelSetup.Mono:
case AudioChannelSetup.Stereo:
l_OutputParameters.ChannelCount = configuration.Channels; break;
default: throw new NotSupportedException(string.Format("Audio channel setup {0} not supported!", configuration.ChannelSetup));
}
switch (configuration.Format)
{
case AudioSampleFormat.Float: l_OutputParameters.SampleFormat = PASampleFormat.Float32; break;
case AudioSampleFormat.Int8: l_OutputParameters.SampleFormat = PASampleFormat.Int8; break;
case AudioSampleFormat.Int16: l_OutputParameters.SampleFormat = PASampleFormat.Int16; break;
case AudioSampleFormat.Int24: l_OutputParameters.SampleFormat = PASampleFormat.Int24; break;
case AudioSampleFormat.Int32: l_OutputParameters.SampleFormat = PASampleFormat.Int32; break;
default: throw new NotSupportedException(string.Format("Audio format {0} not supported!", configuration.Format));
}
l_OutputParameters.Device = ((PADevice)dev).DeviceIndex;
SamplesPerBuffer = Math.Max(1, configuration.SamplingRate / PA.BuffersPerSecond);
BufferSize = configuration.BytesPerTick * SamplesPerBuffer;
m_CallbackDelegate = new PA.StreamCallbackDelegate(Callback);
PAErrorCode l_ErrorCode = PA.SafeNativeMethods.Pa_OpenStream(out m_StreamHandle, IntPtr.Zero, ref l_OutputParameters, configuration.SamplingRate, (uint)SamplesPerBuffer, PAStreamFlags.ClipOff, m_CallbackDelegate, IntPtr.Zero);
if (l_ErrorCode != PAErrorCode.NoError)
{
throw new Exception(PA.GetErrorText(l_ErrorCode));
}
}
public static extern PAErrorCode Pa_OpenStream(out IntPtr stream, ref PAStreamParameters inputParameters, IntPtr outputParameters, double sampleRate, uint framesPerBuffer, PAStreamFlags streamFlags, StreamCallbackDelegate streamCallback, IntPtr userData);
public static extern PAErrorCode Pa_IsFormatSupported(ref PAStreamParameters inputParameters, ref PAStreamParameters outputParameters, double sampleRate);
