public _AudioConverterEventArgs(
uint _NumberDataPackets,
AudioBufferList _Data,
AudioStreamPacketDescription[] _DataPacketDescription)
{
NumberDataPackets = _NumberDataPackets;
Data = _Data;
DataPacketDescription = _DataPacketDescription;
}
public static CMSampleBuffer CreateReadyWithPacketDescriptions (CMBlockBuffer dataBuffer, CMFormatDescription formatDescription, int samplesCount,
CMTime sampleTimestamp, AudioStreamPacketDescription[] packetDescriptions, out CMSampleBufferError error)
{
if (dataBuffer == null)
throw new ArgumentNullException ("dataBuffer");
if (formatDescription == null)
throw new ArgumentNullException ("formatDescription");
if (samplesCount <= 0)
throw new ArgumentOutOfRangeException ("samplesCount");
IntPtr buffer;
error = CMAudioSampleBufferCreateReadyWithPacketDescriptions (IntPtr.Zero, dataBuffer.handle,
formatDescription.handle, samplesCount, sampleTimestamp, packetDescriptions, out buffer);
if (error != CMSampleBufferError.None)
return null;
return new CMSampleBuffer (buffer, true);
}
extern static /* OSStatus */ CMSampleBufferError CMAudioSampleBufferCreateReadyWithPacketDescriptions ( /* CFAllocatorRef */ IntPtr allocator, /* CMBlockBufferRef */ IntPtr dataBuffer, /* CMFormatDescriptionRef */ IntPtr formatDescription, /* CMItemCount */ nint numSamples, CMTime sbufPTS, /* AudioStreamPacketDescription* */ AudioStreamPacketDescription[] packetDescriptions, /* CMSampleBufferRef* */ out IntPtr sBufOut);
extern static CMSampleBufferError CMAudioSampleBufferCreateWithPacketDescriptions ( /* CFAllocatorRef */ IntPtr allocator, /* CMBlockBufferRef */ IntPtr dataBuffer, /* Boolean */ bool dataReady, /* CMSampleBufferMakeDataReadyCallback */ IntPtr makeDataReadyCallback, /* void */ IntPtr makeDataReadyRefcon, /* CMFormatDescriptionRef */ IntPtr formatDescription, /* CMItemCount */ nint numSamples, CMTime sbufPTS, /* AudioStreamPacketDescription* */ AudioStreamPacketDescription[] packetDescriptions, /* CMSampleBufferRef* */ out IntPtr sBufOut);
static int complexInputDataProc(
IntPtr inAudioConverrter,
ref uint ioNumberDataPackets,
AudioBufferList ioData,
ref AudioStreamPacketDescription[] outDataPacketDescription, //AudioStreamPacketDescription**
IntPtr inUserData
)
{
// getting audiounit instance
var handler = GCHandle.FromIntPtr(inUserData);
var inst = (_AudioConverter)handler.Target;
// evoke event handler with an argument
if (inst.EncoderCallback != null)
{
var args = new _AudioConverterEventArgs(
ioNumberDataPackets,
ioData,
outDataPacketDescription);
inst.EncoderCallback(inst, args);
}
return 0; // noerror
}
static extern int AudioConverterFillComplexBuffer(
IntPtr inAudioConverter,
AudioConverterComplexInputDataProc inInputDataProc,
IntPtr inInputDataProcUserData,
ref uint ioOutputDataPacketSize,
AudioBufferList outOutputData,
AudioStreamPacketDescription[] outPacketDescription);
public void FillBuffer(AudioBufferList data, uint numberFrames, AudioStreamPacketDescription[] packetDescs)
{
uint numPackets = numberFrames;
int err = AudioConverterFillComplexBuffer(
_audioConverter,
complexInputDataProc,
GCHandle.ToIntPtr(_handle),
ref numPackets,
data,
packetDescs);
if(err != 0 || numPackets == 0) {
throw new InvalidOperationException(String.Format("Error code:{0}", err));
}
}
