iOS錄音的幾個函數調用

int i, bufferByteSize;

UInt32 size;

CFURLRef url;

readarri=0;

try {

mFileName = CFStringCreateCopy(kCFAllocatorDefault, inRecordFile);

// specify the recording format

SetupAudioFormat(kAudioFormatLinearPCM);

// create the queue

XThrowIfError(AudioQueueNewInput(

  &mRecordFormat,

  MyInputBufferHandler,

  this /* userData */,

  NULL /* run loop */, NULL /*
run loop mode */,

  0 /* flags */, &mQueue), "AudioQueueNewInput
failed");

// get the record format back from the queue's audio converter --

// the file may require a more specific stream description than was necessary to create the encoder.

mRecordPacket = 0;

size = sizeof(mRecordFormat);

XThrowIfError(AudioQueueGetProperty(mQueue, kAudioQueueProperty_StreamDescription,

&mRecordFormat, &size), "couldn't get queue's format");

NSString *recordFile = [NSTemporaryDirectory() stringByAppendingPathComponent:
(NSString*)inRecordFile];

url = CFURLCreateWithString(kCFAllocatorDefault, (CFStringRef)recordFile, NULL);

// create the audio file

XThrowIfError(AudioFileCreateWithURL(url, kAudioFileCAFType,
&mRecordFormat,kAudioFileFlags_EraseFile,

  &mRecordFile), "AudioFileCreateWithURL failed");

CFRelease(url);

// copy the cookie first to give the file object as much info as we can about the data going in

// not necessary for pcm, but required for some compressed audio

CopyEncoderCookieToFile();

// allocate and enqueue buffers

bufferByteSize = ComputeRecordBufferSize(&mRecordFormat, kBufferDurationSeconds);//
enough bytes for half a second

for (i = 0; i < kNumberRecordBuffers; ++i) {

XThrowIfError(AudioQueueAllocateBuffer(mQueue, bufferByteSize, &mBuffers[i]),

  "AudioQueueAllocateBuffer failed");

XThrowIfError(AudioQueueEnqueueBuffer(mQueue, mBuffers[i], 0, NULL),

  "AudioQueueEnqueueBuffer failed");

}

// start the queue

mIsRunning = true;

XThrowIfError(AudioQueueStart(mQueue, NULL), "AudioQueueStart
failed");

}

catch (CAXException &e) {

char buf[256];

fprintf(stderr, "Error: %s (%s)\n", e.mOperation, e.FormatError(buf));

}

catch (...) {

fprintf(stderr, "An unknown
error occurred\n");

}