如何轉換那個UnsafeMutablePointer <UnsafeMutablePointer<Float> &gt;變量到AudioBufferList？

Question

我在Swift項目中有這個EZAudio方法，用於從麥克風中捕獲音頻：

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

}

但我真正需要的是將“bufferList”參數作為AudioBufferList類型傳入，以便通過套接字發送這些音頻數據包，就像我在Objective C中所做的那樣：

//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);
}

如何將UnsafeMutablePointer>變量轉換為AudioBufferList？

Answer 1

我相信你會創建一個AudioBufferList指針並使用memory功能的結果。

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

Answer 2

我能夠將麥克風中的音頻流式傳輸到套接字中，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
    }

這個一般的AudioStreamDescriptor設置對我有用，您可能需要根據自己的需要調整它或省略一些部分，比如波形動畫：

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
    }

讓這件東西運轉起來很復雜，祝你好運！