Created
February 26, 2017 06:12
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AVAudioConverter
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| audioEngine.inputNode!.installTap(onBus: 0, bufferSize: AVAudioFrameCount(format.sampleRate * 0.4), format: format, block: { (buffer: AVAudioPCMBuffer!, time: AVAudioTime!) -> Void in | |
| let converter = AVAudioConverter.init(from: format, to: downFormat) | |
| let newbuffer = AVAudioPCMBuffer(pcmFormat: downFormat, | |
| frameCapacity: AVAudioFrameCount(downFormat.sampleRate * 0.4)) | |
| let inputBlock : AVAudioConverterInputBlock = { (inNumPackets, outStatus) -> AVAudioBuffer? in | |
| outStatus.pointee = AVAudioConverterInputStatus.haveData | |
| let audioBuffer : AVAudioBuffer = buffer | |
| return audioBuffer | |
| } | |
| var error : NSError? | |
| converter.convert(to: newbuffer, error: &error, withInputFrom: inputBlock) | |
| _ = ExtAudioFileWrite(self.outref!, newbuffer.frameLength, newbuffer.audioBufferList) | |
| }) |
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