ios - Objective-c 将参数传递给 IBAction

Question

我在 iPhone SDK 上开发实时音频处理，我使用“EZAudio”从麦克风获取数据，然后用高通滤波器过滤它们，最后在“EZAudio”的帮助下绘制它们。

我设置了两个按钮来绘制原始波形和过滤后的波形。我不知道如何将数据从麦克风传递到 -(IBAction)？

这是我的代码:

来自 microphoneDelegate 的数据

-(void)    microphone:(EZMicrophone *)microphone
     hasAudioReceived:(float **)buffer
       withBufferSize:(UInt32)bufferSize
 withNumberOfChannels:(UInt32)numberOfChannels {
dispatch_async(dispatch_get_main_queue(), ^{

    // Update time domain plot
    [self.audioPlotTime updateBuffer:buffer[0]
                      withBufferSize:bufferSize];

    });
}

我写的高通滤波器:

-(void)processSampleForHighOrLowPassFilter:(float)bufferSize
                             withAudioData:(float*)inBuffer
                            withFilterType:(UInt32)filterType {

    float *outBuffer = (float *)malloc(sizeof(float)*bufferSize);

    for (int i=0; i<bufferSize; i++) {

        outBuffer[i] = (a0 * (inBuffer[i])) 
                       + (a1 * tmpBufferInIndex[0])
                       + (a2 * tmpBufferInIndex[1])
                       - (b1 * tmpBufferOutIndex[0]) 
                       - (b2 * tmpBufferOutIndex[1]);

        tmpBufferInIndex[1] = tmpBufferInIndex[0];
        tmpBufferInIndex[0] = inBuffer[i];
        tmpBufferOutIndex[1] = tmpBufferOutIndex[0];
        tmpBufferOutIndex[0] = outBuffer[i];
   }

   [self.audioPlotHighPassFilter8kHz updateBuffer:outBuffer
                                    withBufferSize:bufferSize];
}

我想用一个按钮触发绘制原始波形和处理后的波形

-(void)plotOriginalWaveForm:(id)sender {
    //[self.audioPlot updateBuffer:outBuffer
    //              withBufferSize:bufferSize];
}

-(void)plot8kHzWaveForm:(id)sender {
    //[self.audioPlotHighPassFilter8kHz updateBuffer:outBuffer
    //                                withBufferSize:bufferSize];
}

但是我不明白如何将buffer和bufferSize传递给IBAction，因为我会在里面调用plot函数而plot函数需要这两个参数。

如果您能提供一些建议或有任何其他方法可以在 IBAction 中使用来自麦克风的数据，谢谢!

Answer 1

将缓冲区和缓冲区大小信息作为属性存储在您的类中，当您在麦克风委托(delegate)中被调用时设置它们，并在绘制波形时从属性中检索它们，而不是作为参数传递。

编辑以提供可能的示例，具体取决于原始代码周围的类:

在@interface block 中的 .h 文件中:

{
    float ** myBuffer;
    UInt32 myBufferSize;
}

在你的方法中:

-(void)    microphone:(EZMicrophone *)microphone
     hasAudioReceived:(float **)buffer
       withBufferSize:(UInt32)bufferSize
 withNumberOfChannels:(UInt32)numberOfChannels {

    self.myBuffer = buffer;
    self.myBufferSize = bufferSize;
dispatch_async(dispatch_get_main_queue(), ^{

    // Update time domain plot
    [self.audioPlotTime updateBuffer:buffer[0]
                  withBufferSize:bufferSize];

     });
}

-(void)plotOriginalWaveForm:(id)sender {
    [self.audioPlot myBuffer
                  myBufferSize];
}

-(void)plot8kHzWaveForm:(id)sender {
    [self.audioPlotHighPassFilter8kHz myBuffer
                                withBufferSize:myBufferSize];
}