On Jan 4, 12:41 am, Serdel <[email protected]> wrote:
> How do you predict the size of the destination array? I mean I think
> you also copy the samples from audiostream into a smaller temp buffer
> and then into your dest. larger one - if you use an array for the
> dest. one how do you set size of that?
Hmmm. It's been a very long time since I looked at this code. I kick-
start it with something like this:
int minBufferBytes = AudioRecord.getMinBufferSize(sampleRate,
channelConfig, audioFormat);
mBufferBytes = /*Some value >= minBufferBytes*/;
mBufferFrames = mBufferBytes / (numChannels * sampleBytes);
mReceivedAudioBufferSrt = new short[mBufferFrames];
mRecordingEndPos = 0;
mAudioRecord = new AudioRecord(source, sampleRate, channelConfig,
audioFormat, numBufferBytes);
mAudioRecord.startRecording();
new Thread(new Runnable() {
public void run() {
processRecording();
} // Runnable.run()
}).start(); // New Runnable inside New Thread
...where processRecording(), obviously now running on its own thread
parallel to the ongoing recording, does something like this:
while (mAudioRecord.getRecordingState() ==
AudioRecord.RECORDSTATE_RECORDING) {
int numDataRead = mAudioRecord.read(mReceivedAudioBufferSrt, 0,
mBufferFrames);
System.arraycopy(mReceivedAudioBufferSrt, 0,
mRecordingDesc.mRecordingSrt, mRecordingEndPos, mBufferFrames);
mRecordingEndPos += mBufferFrames;
if (mRecordingEndPos == mRecordingNumFrames)
mRecordingEndPos = 0;
}
That's heavily pseudoized from my considerably more complicated
overall setup, but it's the basic idea. I have to be very careful the
size of the data chunks I grab because I need to perform realtime
power-2 FFTs on them in my app. Plus I have switches all over the
place to handle a variety of sampling rates, sample sizes (1 or 2
bytes), number of channels, etc. The complexity grows very quickly
once you start worrying about all of that stuff.
Cheers!
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