Hello,

I am writing a class that opens an AudioQueue and analyzes its characteristics, and then under certain conditions can begin or end writing out a file from that AudioQueue that is already instantiated. This is my code (entirely based on SpeakHere) that opens the AudioQueue without writing anything out to tmp:

void AQRecorder::StartListen() {
int i, bufferByteSize;
UInt32 size;

try {       

    SetupAudioFormat(kAudioFormatLinearPCM);

    XThrowIfError(AudioQueueNewInput(&mRecordFormat,
                    MyInputBufferHandler,
                    this,
                    NULL, NULL,
                    0, &mQueue), "AudioQueueNewInput failed");

    mRecordPacket = 0;

    size = sizeof(mRecordFormat);
    XThrowIfError(AudioQueueGetProperty(mQueue, kAudioQueueProperty_StreamDescription,  
            &mRecordFormat, &size), "couldn't get queue's format");

    bufferByteSize = ComputeRecordBufferSize(&mRecordFormat, kBufferDurationSeconds);
    for (i = 0; i < kNumberRecordBuffers; ++i) {
        XThrowIfError(AudioQueueAllocateBuffer(mQueue, bufferByteSize, &mBuffers[i]),
                      "AudioQueueAllocateBuffer failed");
        XThrowIfError(AudioQueueEnqueueBuffer(mQueue, mBuffers[i], 0, NULL),
                      "AudioQueueEnqueueBuffer failed");
    }

    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");
}
}

But I'm a little unclear on how to write a function that will tell this queue "from now until the stop signal, start writing out this queue to tmp as a file". I understand how to tell an AudioQueue to write out as a file at the time that it's created, how to set files format, etc, but not how to tell it to start and stop midstream. Much appreciative of any pointers, thanks.