How to resemple pcm data in iOS - ios

Question

I want to use AudioConverterFillComplexBuffer to convert sample rate for a pcm buffer（32k to 44.1k）。But i didn't know why the voice seems changed（too many noise）。Here is the main code：
struct AudioFrame {
int samples; //number of samples in this frame. e.g. 320
int bytesPerSample; //number of bytes per sample: 2 for PCM16.
int channels; //number of channels (data are interleaved if stereo)
int samplesPerSec; //sampling rate
void* buffer; //data buffer
};
-(void)convertAudioFrame:(AudioFrame *)buffer outPutData:(unsigned char **)outPutData outPutDataSize:(UInt32 *)outPutDataSize{
if (buffer->bytesPerSample != self.unitDescription.mBitsPerChannel ||
buffer->channels != self.unitDescription.mChannelsPerFrame ||
buffer->samplesPerSec != self.unitDescription.mSampleRate){
// describe the input format's description
AudioStreamBasicDescription inputDescription = {0};
inputDescription.mFormatID = kAudioFormatLinearPCM;
inputDescription.mFormatFlags = kLinearPCMFormatFlagIsPacked | kLinearPCMFormatFlagIsSignedInteger;
inputDescription.mChannelsPerFrame = buffer->channels;
inputDescription.mSampleRate = buffer->samplesPerSec;
inputDescription.mBitsPerChannel = 16;
inputDescription.mBytesPerFrame = (inputDescription.mBitsPerChannel/8) * inputDescription.mChannelsPerFrame;
inputDescription.mFramesPerPacket = 1;
inputDescription.mBytesPerPacket = inputDescription.mBytesPerFrame;
AudioStreamBasicDescription outputDescription = {0};
outputDescription.mSampleRate = 44100;
outputDescription.mFormatID = kAudioFormatLinearPCM;
outputDescription.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
outputDescription.mChannelsPerFrame = 1;
outputDescription.mFramesPerPacket = 1;
outputDescription.mBitsPerChannel = 16;
outputDescription.mBytesPerFrame = (outputDescription.mBitsPerChannel/8) * outputDescription.mChannelsPerFrame;
outputDescription.mBytesPerPacket = outputDescription.mBytesPerFrame;
// create an audio converter
AudioConverterRef audioConverter;
OSStatus status = AudioConverterNew(&inputDescription, &outputDescription, &audioConverter);
[self checkError:status errorMsg:#"AudioConverterNew error"];
if(!audioConverter)
{
*outPutDataSize = 0;
return;
}
UInt32 outputBytes = outputDescription.mBytesPerPacket * (buffer->samples*buffer->bytesPerSample / inputDescription.mBytesPerPacket);
unsigned char *outputBuffer = (unsigned char*)malloc(outputBytes);
memset(outputBuffer, 0, outputBytes);
AudioBuffer inputBuffer;
inputBuffer.mNumberChannels = inputDescription.mChannelsPerFrame;
inputBuffer.mDataByteSize = buffer->samples*buffer->bytesPerSample;
inputBuffer.mData = buffer->buffer;
AudioBufferList outputBufferList;
outputBufferList.mNumberBuffers = 1;
outputBufferList.mBuffers[0].mNumberChannels = outputDescription.mChannelsPerFrame;
outputBufferList.mBuffers[0].mDataByteSize = outputBytes;
outputBufferList.mBuffers[0].mData = outputBuffer;
UInt32 outputDataPacketSize = outputBytes / outputDescription.mBytesPerPacket;
self.currentBuffer = &inputBuffer;
self.currentInputDescription = inputDescription;
// convert
OSStatus result = AudioConverterFillComplexBuffer(audioConverter,
converterComplexInputDataProc,
(__bridge void*)self,
&outputDataPacketSize,
&outputBufferList,
NULL);
[self checkError:result errorMsg:#"AudioConverterConvertBuffer error"];
*outPutData = outputBuffer;
*outPutDataSize = outputBytes;
AudioConverterDispose(audioConverter);
}
}
//convert callback
OSStatus converterComplexInputDataProc(AudioConverterRef inAudioConverter,
UInt32* ioNumberDataPackets, AudioBufferList* ioData, AudioStreamPacketDescription** ioDataPacketDescription, void* inUserData){
XMMicAudioManager *self = (__bridge XMMicAudioManager *)inUserData;
ioData->mNumberBuffers = 1;
ioData->mBuffers[0] = *(self.currentBuffer);
*ioNumberDataPackets = ioData->mBuffers[0].mDataByteSize / self.currentInputDescription.mBytesPerPacket;
return 0;
}