iphone - CMSampleBufferRef 内存泄漏

Question

所以我在转换一些音频时遇到了问题。我在转换时遇到了巨大的内存泄漏，它来自这些代码行。

dispatch_queue_t mediaInputQueue = dispatch_queue_create("mediaInputQueue", NULL);
[assetWriterInput requestMediaDataWhenReadyOnQueue:mediaInputQueue 
                                        usingBlock: ^ 
 {

     while (assetWriterInput.readyForMoreMediaData) 
     {
         CMSampleBufferRef nextBuffer = [assetReaderOutput copyNextSampleBuffer];
         if (nextBuffer) 
         {

             [assetWriterInput appendSampleBuffer: nextBuffer];
              nextBuffer = NULL;              

         } 
         else 
         {
             // done!
             [assetWriterInput markAsFinished];
             [assetWriter finishWriting];
             [assetReader cancelReading];
             NSDictionary *outputFileAttributes = [[NSFileManager defaultManager]
                                                   attributesOfItemAtPath:exportPath
                                                   error:nil];





             NSNumber *doneFileSize = [NSNumber numberWithLong:[outputFileAttributes fileSize]];
             [self performSelectorOnMainThread:@selector(updateCompletedSizeLabel:)
                                    withObject:doneFileSize
                                 waitUntilDone:NO];

             // release a lot of stuff
             [assetReader release];
             [assetReaderOutput release];
             [assetWriter release];
             [assetWriterInput release];
             [exportPath release];
             break;
         }
     }

 }];

似乎导致泄漏的行是: CMSampleBufferRef nextBuffer = [assetReaderOutput copyNextSampleBuffer];

我迷失在这个问题上，我们将不胜感激。

回答: 固定 - 只需在 if/else 语句的末尾添加这些行。

CMSampleBufferInvalidate(nextBuffer);
         CFRelease(nextBuffer);
         nextBuffer = nil; // NULL?

Answer 1

答案:已修复 - 只需在 if/else 语句的末尾添加这些行。

CMSampleBufferInvalidate(nextBuffer);
CFRelease(nextBuffer);
nextBuffer = NULL;