I was making an app which was streaming audio from the microphone, but for some odd reason it was throwing exceptions.
Here's the initialisation code.
int RECORDER_SAMPLERATE = 8000;
int RECORDER_CHANNELS = AudioFormat.CHANNEL_CONFIGURATION_STEREO;
int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_8BIT;
int bufferSizeInBytes = AudioTrack.getMinBufferSize(
RECORDER_SAMPLERATE,
RECORDER_CHANNELS,
RECORDER_AUDIO_ENCODING
);
AudioTrack audioTrack = new AudioTrack(
AudioManager.STREAM_MUSIC,
RECORDER_SAMPLERATE,
RECORDER_CHANNELS,
RECORDER_AUDIO_ENCODING,
bufferSizeInBytes,
AudioTrack.MODE_STREAM);
Now it looked completely fine to me, and it took a good while for me to figure out because I never expected AudioTrack.getMinBufferSize() to actually return an error!
The reason was that AudioTrack could not be initialised for the given PCM encoding. I was trying to reduce bandwidth by making it 8bit, but the recording had to be in 16bit PCM.
It's not an obvious one, but it's a bug I could only catch find after testing on multiple devices.
Bug caught.
