[英]Core Audio memory issues
我的音頻單元分析項目存在一些內存問題,因此,每次渲染音頻單元(或其周圍的某個地方)時,它都會分配一堆未被釋放的內存,導致內存使用量激增,應用最終崩潰。
在工具中,我注意到下面的32字節malloc字符串重復出現,並且它們仍然處於活動狀態:
BufferedAudioConverter :: AllocateBuffers()x6 BufferedInputAudioConverter:BufferedInputAudioConverter(StreamDescPair const&)x 3
任何想法可能出在哪里? 該進程何時分配內存,如何安全地釋放它?
非常感謝。
該代碼基於某些非Apple示例代碼,來自sleepyleaf.com的PitchDetector
一些代碼提取了問題可能所在的位置.....請讓我知道是否需要更多代碼。
renderErr = AudioUnitRender(rioUnit, ioActionFlags,
inTimeStamp, bus1, inNumberFrames, THIS->bufferList); //128 inNumberFrames
if (renderErr < 0) {
return renderErr;
}
// Fill the buffer with our sampled data. If we fill our buffer, run the
// fft.
int read = bufferCapacity - index;
if (read > inNumberFrames) {
memcpy((SInt16 *)dataBuffer + index, THIS->bufferList->mBuffers[0].mData, inNumberFrames*sizeof(SInt16));
THIS->index += inNumberFrames;
} else { DO ANALYSIS
memset(outputBuffer,0,n * sizeof(SInt16));
- (void)createAUProcessingGraph {
OSStatus err;
// Configure the search parameters to find the default playback output unit
// (called the kAudioUnitSubType_RemoteIO on iOS but
// kAudioUnitSubType_DefaultOutput on Mac OS X)
AudioComponentDescription ioUnitDescription;
ioUnitDescription.componentType = kAudioUnitType_Output;
ioUnitDescription.componentSubType = kAudioUnitSubType_RemoteIO;
ioUnitDescription.componentManufacturer = kAudioUnitManufacturer_Apple;
ioUnitDescription.componentFlags = 0;
enter code here
ioUnitDescription.componentFlagsMask = 0;
// Declare and instantiate an audio processing graph
NewAUGraph(&processingGraph);
// Add an audio unit node to the graph, then instantiate the audio unit.
/*
An AUNode is an opaque type that represents an audio unit in the context
of an audio processing graph. You receive a reference to the new audio unit
instance, in the ioUnit parameter, on output of the AUGraphNodeInfo
function call.
*/
AUNode ioNode;
AUGraphAddNode(processingGraph, &ioUnitDescription, &ioNode);
AUGraphOpen(processingGraph); // indirectly performs audio unit instantiation
// Obtain a reference to the newly-instantiated I/O unit. Each Audio Unit
// requires its own configuration.
AUGraphNodeInfo(processingGraph, ioNode, NULL, &ioUnit);
// Initialize below.
AURenderCallbackStruct callbackStruct = {0};
UInt32 enableInput;
UInt32 enableOutput;
// Enable input and disable output.
enableInput = 1; enableOutput = 0;
callbackStruct.inputProc = RenderFFTCallback;
callbackStruct.inputProcRefCon = (__bridge void*)self;
err = AudioUnitSetProperty(ioUnit, kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Input,
kInputBus, &enableInput, sizeof(enableInput));
err = AudioUnitSetProperty(ioUnit, kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Output,
kOutputBus, &enableOutput, sizeof(enableOutput));
err = AudioUnitSetProperty(ioUnit, kAudioOutputUnitProperty_SetInputCallback,
kAudioUnitScope_Input,
kOutputBus, &callbackStruct, sizeof(callbackStruct));
// Set the stream format.
size_t bytesPerSample = [self ASBDForSoundMode];
err = AudioUnitSetProperty(ioUnit, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output,
kInputBus, &streamFormat, sizeof(streamFormat));
err = AudioUnitSetProperty(ioUnit, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input,
kOutputBus, &streamFormat, sizeof(streamFormat));
// Disable system buffer allocation. We'll do it ourselves.
UInt32 flag = 0;
err = AudioUnitSetProperty(ioUnit, kAudioUnitProperty_ShouldAllocateBuffer,
kAudioUnitScope_Output,
kInputBus, &flag, sizeof(flag));
// Allocate AudioBuffers for use when listening.
// TODO: Move into initialization...should only be required once.
bufferList = (AudioBufferList *)malloc(sizeof(AudioBuffer));
bufferList->mNumberBuffers = 1;
bufferList->mBuffers[0].mNumberChannels = 1;
bufferList->mBuffers[0].mDataByteSize = 512*bytesPerSample;
bufferList->mBuffers[0].mData = calloc(512, bytesPerSample);
}
我設法找到並解決了該問題,該問題位於上面未發布的代碼區域中。
在接下來的步驟中,使用AudioConverter對象將輸出緩沖區轉換為其他數字格式。 但是,轉換器對象並未被丟棄,而是保留在內存中。 我通過使用AudioConverterDispose修復了它,如下所示:
err = AudioConverterNew(&inFormat, &outFormat, &converter);
err = AudioConverterConvertBuffer(converter, inSize, buf, &outSize, outputBuf);
err = AudioConverterDispose (converter);
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