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RecordState* recordState = (RecordState*)inUserData ĪudioQueueEnqueueBuffer(recordState->queue, inBuffer, 0, NULL) Īnd the code to write the audio to a file: OSStatus status = AudioFileWritePackets(recordState->audioFile,
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AVRECORDER WRITE TO BUFFER HOW TO
How to do this? In the code below there is inBuffer->mAudioData which is tantalizingly close but I can find no information about what format this 'data' is in or how to access it.ĪudioQueue Callback: void AudioInputCallback(void *inUserData,Ĭonst AudioStreamPacketDescription *inPacketDescs) Apple's AVAudioRecorder (infuriatingly) will give you levels and write the data, but not actually give you access to it. I don't want to write anything to a file, which is what all the tutorials -?and even Apple's convenience I/O objects -?seem to be aiming at. Here, the internal buffer of the BufferedReader has the default size of 8192 characters. Built-in methods to write to a file, but nothing where you actually peer inside the packets to see the data. // Creates a FileReader FileReader file new FileReader(String file) // Creates a BufferedReader BufferedReader buffer new BufferedReader(file) In the above example, we have created a BufferedReader named buffer with the FileReader named file. The audio callback, though, gives an AudioQueueRef, and I'm finding Apple's documentation thin on this side of things. There are, of course, many options: the AudioQueue tutorial at trailsinthesand gets things started. Data read from the hard drive, tape, or another CD is stored in the buffer, and pulled out as needed by the recorder. I'm working on getting audio into the iPhone in a form where I can pass it to a (C++) analysis algorithm. To avoid a situation where a temporary slowdown in the computer causes the write process to fail, the makers of CD recorders put a write buffer in the drive, usually between 512K and 4MB in size.