in iOS Entended Audio File Services and Streaming Audio - ios

Question

First Export from iPod Library m4a file.
Second Convert to AAC using Extended Audio File Services
Third transport the music file to other iPhone.
Fourth Streaming audio using Audio File Stream Services
It usually works.But the audio file playtime over about 5minitues it can't work.
However,I try 15minitues audio file mp3 and aac into my project.and streaming it.it worked.
So,I think the cause is Convert Step. Something wrong with my code ?
Could you give me some advices ?
-(void)convertFrom:(NSURL*)fromURL
toURL:(NSURL*)toURL{
ExtAudioFileRef infile,outfile;
OSStatus err;
//ExtAudioFileの作成
err = ExtAudioFileOpenURL((__bridge CFURLRef)fromURL, &infile);
checkError(err,"ExtAudioFileOpenURL");
AudioStreamBasicDescription inputFormat;
AudioStreamBasicDescription outputFormat;
AVAudioSession * audiosession =[AVAudioSession sharedInstance];
[audiosession setActive:YES error:nil];
[audiosession setCategory:AVAudioSessionCategoryAudioProcessing error:nil];
//変換するフォーマット(AAC)
memset(&outputFormat, 0, sizeof(AudioStreamBasicDescription));
outputFormat.mSampleRate = 44100.0;
outputFormat.mFormatID = kAudioFormatMPEG4AAC;//AAC
outputFormat.mChannelsPerFrame = 1;
UInt32 size = sizeof(AudioStreamBasicDescription);
AudioFormatGetProperty(kAudioFormatProperty_FormatInfo,
0, NULL,
&size,
&outputFormat);//変換後のフォーマット
err = ExtAudioFileGetProperty(infile,//変換前のファイルのプロパティを取得
kExtAudioFileProperty_FileDataFormat,
&size,
&inputFormat);
checkError(err,"ExtAudioFileGetProperty");
//リニアPCM以外からの変換であれば、リニアPCMとして読み込む
if(inputFormat.mFormatID != kAudioFormatLinearPCM){
//一旦変換するフォーマット(リニアPCM Little Endian)
AudioStreamBasicDescription linearPCMFormat;
linearPCMFormat.mSampleRate = outputFormat.mSampleRate;
linearPCMFormat.mFormatID = kAudioFormatLinearPCM;
linearPCMFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked;
linearPCMFormat.mFramesPerPacket = 1;
linearPCMFormat.mChannelsPerFrame = outputFormat.mChannelsPerFrame;
linearPCMFormat.mBitsPerChannel = 16;
linearPCMFormat.mBytesPerPacket = 2 * outputFormat.mChannelsPerFrame;
linearPCMFormat.mBytesPerFrame = 2 * outputFormat.mChannelsPerFrame;
linearPCMFormat.mReserved = 0;
//読み出すフォーマットをリニアPCMにする(中間フォーマット)
inputFormat = linearPCMFormat;
}
//読み込むフォーマットを設定
//必ずlinearPCMで読み出される
err = ExtAudioFileSetProperty(infile,
kExtAudioFileProperty_ClientDataFormat,
sizeof(AudioStreamBasicDescription),
&inputFormat);
checkError(err,"ExtAudioFileSetProperty");
err = ExtAudioFileCreateWithURL((__bridge CFURLRef)toURL,
kAudioFileM4AType, //AAC
&outputFormat,
NULL,
kAudioFileFlags_EraseFile,
&outfile);
checkError(err,"ExtAudioFileCreateWithURL");
//書き込むファイルに、入力がリニアPCMであることを設定
err = ExtAudioFileSetProperty(outfile,
kExtAudioFileProperty_ClientDataFormat,
sizeof(AudioStreamBasicDescription),
&inputFormat);
checkError(err,"kExtAudioFileProperty_ClientDataFormat");
//読み込み位置を0に移動
err = ExtAudioFileSeek(infile, 0);
checkError(err,"ExtAudioFileSeek");
//一度に読み込むフレーム数
UInt32 readFrameSize = 1024;
//読み込むバッファ領域を確保
UInt32 bufferByteSize = sizeof(char) * readFrameSize * inputFormat.mBytesPerPacket;
char *buffer = malloc(bufferByteSize);
//AudioBufferListの作成
AudioBufferList audioBufferList;
audioBufferList.mNumberBuffers = 1;
audioBufferList.mBuffers[0].mNumberChannels = inputFormat.mChannelsPerFrame;
audioBufferList.mBuffers[0].mDataByteSize = bufferByteSize;
audioBufferList.mBuffers[0].mData = buffer;
while(1){
UInt32 numPacketToRead = readFrameSize;
err = ExtAudioFileRead(infile, &numPacketToRead, &audioBufferList);
checkError(err,"ExtAudioFileRead");
//読み込むフレームが無くなったら終了する
if(numPacketToRead == 0){
NSLog(#"変換完了");
break;
}
err = ExtAudioFileWrite(outfile,
numPacketToRead,
&audioBufferList);
checkError(err,"ExtAudioFileWrite");
}
ExtAudioFileDispose(infile);
ExtAudioFileDispose(outfile);
free(buffer);
void propertyListenerProc(
void * inClientData,
AudioFileStreamID inAudioFileStream,
AudioFileStreamPropertyID inPropertyID,
UInt32 * ioFlags
){
StreamInfo* streamInfo = (StreamInfo*)inClientData;
OSStatus err;
NSLog(#"property%u",(unsigned int)inPropertyID);