Apple

OSStatus DeclipUnit::Render(AudioUnitRenderActionFlags &ioActionFlags,
const AudioTimeStamp &inTimeStamp,
UInt32 nFrames)

and have the following snippet of code in it. I simplified the code, actually I need to buffer several packets before applying an effect. Here I just demonstrate the problem:

newTimeStamp.mSampleTime += nFrames;
result = m_pMainInput->PullInput(ioActionFlags, newTimeStamp, 0, nFrames);
if (result != noErr)
return result;

where m_pMainInput == GetInput(0);

so I pull from the upstream object the same amount of frames but at another timestamp. Then I initialize the output buffers like this:

m_pMainOutput->PrepareBuffer(nFrames);

and fill them with data, for simplicity like this:

for (UInt32 channel = 0; channel < GetOutput(0)->GetStreamFormat().mChannelsPerFrame; ++channel)
{
const AudioBuffer *srcBuffer = &m_pMainInput->GetBufferList().mBuffers[channel];
const AudioBuffer *dstBuffer = &m_pMainOutput->GetBufferList().mBuffers[channel];

memcpy(dstBuffer->mData, srcBuffer->mData, srcBuffer->mDataByteSize);
}

This works pretty well in the AULab application but auval tool fails with the following error:

Input Format: AudioStreamBasicDescription: 2 ch, 44100 Hz, 'lpcm' (0x00000029) 32-bit little-endian float, deinterleaved
Output Format: AudioStreamBasicDescription: 2 ch, 44100 Hz, 'lpcm' (0x00000029) 32-bit little-endian float, deinterleaved
Render Test at 512 frames
ERROR: AU is not passing time stamp correctly. Was given: 0, but input received: 512

* * FAIL
--------------------------------------------------
AU VALIDATION FAILED: CORRECT THE ERRORS ABOVE.
--------------------------------------------------

If I remove the line that changes the timestamp and call just

result = m_pMainInput->PullInput(ioActionFlags, newTimeStamp, 0, nFrames);
if (result != noErr)
return result;

then auvall validates my plugin successfully. So I’m pretty sure that auval concerns that my Audio Unit pulls data from a different timestamp. I found a property that looks like to what I need to make auval sure that all is fine with the timestamps: kAudioUnitProperty_InputSamplesInOutput

but auval never sets this property for my audio unit, so it looks useless.

Does anybody know if reading data at appropriate timestamps is possible for ‘aufx’ audio units? I tried to look at ‘auol’ (offline) units, but they seem to be of no use, at least neither AULab, nor Final Cut Pro uses this type of audio units.

Please help!

Roman