如何将UnsafeMutablePointer<UnsafeMutablePointer<Float>>变量转换为AudioBufferList？

Question

我在Swift项目中有这个EZAudio方法，用于从麦克风捕捉音频：

func microphone(microphone: EZMicrophone!, hasAudioReceived bufferList: UnsafeMutablePointer<UnsafeMutablePointer<Float>>, withBufferSize bufferSize: UInt32, withNumberOfChannels numberOfChannels: UInt32) {

}

但我真正需要的是将"bufferList“参数作为AudioBufferList类型输入，以便通过套接字发送音频数据包，就像我在目标C中所做的那样：

//Objective C pseudocode:
for(int i = 0; i < bufferList.mNumberBuffers; ++i){
   AudioBuffer buffer = bufferList.mBuffers[i];
   audio = ["audio": NSData(bytes: buffer.mData, length: Int(buffer.mDataByteSize))];
   socket.emit("message", audio);
}

如何将该UnsafeMutablePointer>变量转换为AudioBufferList？

Answer 1

我能够将声音从麦克风中传输到插座中，如下所示：

func microphone(microphone: EZMicrophone!, hasBufferList bufferList: UnsafeMutablePointer<AudioBufferList>, withBufferSize bufferSize: UInt32, withNumberOfChannels numberOfChannels: UInt32) {
        let blist:AudioBufferList=bufferList[0]
        let buffer:AudioBuffer = blist.mBuffers
        let audio = ["audio": NSData(bytes: buffer.mData, length: Int(buffer.mDataByteSize))];
        socket.emit("message", audio);//this socket comes from Foundation framework
    }

这个通用的AudioStreamDescriptor设置为我工作，您可能不得不根据您自己的需要对其进行调整，或者添加一些部件，比如波形动画：

func initializeStreaming() {
        var streamDescription:AudioStreamBasicDescription=AudioStreamBasicDescription()
        streamDescription.mSampleRate       = 16000.0
        streamDescription.mFormatID         = kAudioFormatLinearPCM
        streamDescription.mFramesPerPacket  = 1
        streamDescription.mChannelsPerFrame = 1
        streamDescription.mBytesPerFrame    = streamDescription.mChannelsPerFrame * 2
        streamDescription.mBytesPerPacket   = streamDescription.mFramesPerPacket * streamDescription.mBytesPerFram
        streamDescription.mBitsPerChannel   = 16
        streamDescription.mFormatFlags      = kAudioFormatFlagIsSignedInteger
        microphone = EZMicrophone(microphoneDelegate: self, withAudioStreamBasicDescription: sstreamDescription, startsImmediately: false)
        waveview?.plotType=EZPlotType.Buffer
        waveview?.shouldFill = false
        waveview?.shouldMirror = false
    }

要让这东西运转起来太复杂了，祝你好运！

Answer 2

我相信您将创建一个AudioBufferList指针并使用memory函数的结果。

let audioBufferList = UnsafePointer<AudioBufferList>(bufferList).memory