我在转换一些音频时遇到了问题。当进行转换时,出现了巨大的内存泄漏,原因是这些代码行。
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];
我对这个问题感到困惑,任何帮助都将不胜感激。
答案: 已解决 - 只需在if/else语句的末尾添加这些行。
CMSampleBufferInvalidate(nextBuffer);
CFRelease(nextBuffer);
nextBuffer = nil; // NULL?
CFRelease
之前要调用CMSampleBufferInvalidate
? - Meekohi