在NSOperation中釋放對象

Question

我已經將NSOperation子類化並在需要時將它的實例添加到NSOperationQue中。 在NSOperation的主要功能中，我創建一個AudioBufferList，然後在完成時釋放它。

在樂器的內存分配部分，它顯示了這些AudioBufferLists的實例在不斷攀升。字節的生存數量不斷攀升，緩衝區的mdata部分似乎是罪魁禍首。

這是我的一段代碼。

我是否正確地發佈我的緩衝區列表或者儀器可能報告不正確？

-(void)main 

{ 
//autorelase stuff in here 



     NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; 


    AudioBufferList *bufferList; 

      bufferList = (AudioBufferList *) malloc (
                sizeof (AudioBufferList) + sizeof (AudioBuffer) * (1) 
                ); 

      if (NULL == bufferList) {NSLog (@"*** malloc failure for allocating bufferList memory"); return;} 

      // initialize the mNumberBuffers member 
      bufferList->mNumberBuffers = 2; 

      // initialize the mBuffers member to 0 
      AudioBuffer emptyBuffer = {0}; 
      size_t arrayIndex; 
      for (arrayIndex = 0; arrayIndex < 2; arrayIndex++) { 
       bufferList->mBuffers[arrayIndex] = emptyBuffer; 
      } 

      // set up the AudioBuffer structs in the buffer list 
      bufferList->mBuffers[0].mNumberChannels = 1; 
      bufferList->mBuffers[0].mDataByteSize = numberofframestoread * sizeof (AudioUnitSampleType); 
      bufferList->mBuffers[0].mData   = (AudioUnitSampleType*)calloc(numberofframestoread, sizeof(AudioUnitSampleType)); 

      if (2 == 2) { 
       bufferList->mBuffers[1].mNumberChannels = 1; 
       bufferList->mBuffers[1].mDataByteSize = numberofframestoread * sizeof (AudioUnitSampleType); 
       bufferList->mBuffers[1].mData   = (AudioUnitSampleType*)calloc(numberofframestoread, sizeof(AudioUnitSampleType)); 

      } 


      AudioUnitSampleType *inSamplesChannelLeft=bufferList->mBuffers[0].mData; 
      AudioUnitSampleType *inSamplesChannelRight=bufferList->mBuffers[1].mData; 


// do stuff with buffer here 

free(bufferList); 

bufferlist=nil; 

[pool release] 

} 

Answer 1

你mData是罪魁禍首，一定要釋放那些，以及因爲你分配他們作爲釋放calloc。

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; 

const size_t nBuffers = 2; 
AudioBufferList *bufferList; 

bufferList = (AudioBufferList *) malloc (
             sizeof (AudioBufferList) + sizeof (AudioBuffer) * (nBuffers - 1) 
             ); 

if (NULL == bufferList) {NSLog (@"*** malloc failure for allocating bufferList memory"); [pool drain]; return;} 
// initialize the mNumberBuffers member 
bufferList->mNumberBuffers = nBuffers; 

//... 
bufferList->mBuffers[0].mData   = (AudioUnitSampleType*)calloc(numberofframestoread, sizeof(AudioUnitSampleType)); 
//... 
bufferList->mBuffers[1].mData   = (AudioUnitSampleType*)calloc(numberofframestoread, sizeof(AudioUnitSampleType)); 
//... 

//Free mData here 
for(size_t i = 0; i < nBuffers; i++) 
    free(bufferList->mBuffers[i].mData); 
free(bufferList); 
[pool drain];