AVAudioConverter
AVAudioConverter
- Subject: AVAudioConverter
- From: Doug Adams <email@hidden>
- Date: Mon, 27 Aug 2018 15:26:14 -0400
Is it possible to use AVAudioConverter (in macOS) to encode or decode
Opus-encoded data?
I have an Opus encoded stream with a sample rate of 24,000 and 2 channels which
comes in 10 millisecond “chunks” (i.e. will produce 240 frames when decoded). I
have successfully decoded it using the decoder from lipopus. I see reference to
Opus in some of the AVFoundation documentation but have yet to find any clear
information on how to use it.
Here’s a piece of Swift code to create an Opus format:
var outDesc = AudioStreamBasicDescription(mSampleRate: 24_000, mFormatID:
kAudioFormatOpus, mFormatFlags: 0, mBytesPerPacket: 0, mFramesPerPacket: 0,
mBytesPerFrame: 0, mChannelsPerFrame: 2, mBitsPerChannel: 0,
mReserved: 0)
_opusFormat = AVAudioFormat(streamDescription: &outDesc)!
and its use in AVAudioConverter to convert from a Tap on a MainMixerNode:
_audioConverter = AVAudioConverter(from: tapFormat, to: _opusFormat)
First of all it doesn’t work. I suspect that I need to populate some of the
fields in the ASBD but I can’t find any information as to what should be
populated and the appropriate values.
I have a similar need to encode an Opus stream and would like to do that with
AVAudioConverter if possible.
Thanks for any help you can give.
Doug
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