Apple

Hello CoreAudio people,

My app has a bunch of PCM float vectors in memory. I want to write them to disk as a single uncompressed file (CAF, AIFF, or Wave file). The output file on disk should be interleaved. Do I absolutely have to do this interleaving on my end?

My code to attempt this is currently failing with "fmt?" when I try to set the Client ASBD. I'm pretty sure the flags are correct though [Float, Packed, NonInterleaved], and I filled out the rest of the ASBD for the total number of vectors.

I have two theories:

a) the only PCM support for writing ExtAudioFileWrite is for you to interleave vectors as a single mBuffer?

b) it is supported, but only if you set a valid AudioChannelLayout?

Does anyone know if it's possible?

Thanks,

Charles

PS:

As an aside, here's a snippet of how to create an AudioBufferList in Swift containing more than one mBuffer. Maybe it will save the next guy the pain:

var abl_ptr = AudioBufferList.allocate( maximumBuffers: buffers.count )

defer {

free( abl_ptr.unsafeMutablePointer )

}

for i in 0 ..< buffers.count {

abl_ptr[i] = buffers[i]

}

let abl = abl_ptr.unsafePointer.memory