/**
* Gets an AudioRecord object using the current recording settings
*
* @param context Context which we are getting recorder for
*/
public static AudioRecord getRecorder(Context context) throws IllegalArgumentException {
AudioRecord recorder = null;
int sampleRate = PreferenceHelper.getSampleRate(context);
int bufferSize = PreferenceHelper.getBufferSize(context);
int bufferSizeAdjuster = PreferenceHelper.getBufferSizeAdjuster(context);
int audioSource = AudioSource.MIC;
Log.i(
TAG_AUDIOHELPER,
String.format(
"AudioRecord initialized with saved configuration! sample rate: %d, buffer: %d, buffer adjuster: %d",
sampleRate, bufferSize, bufferSizeAdjuster));
recorder =
new AudioRecord(
audioSource,
sampleRate,
Constants.DEFAULT_CHANNEL_CONFIG,
Constants.DEFAULT_PCM_FORMAT,
bufferSize * bufferSizeAdjuster);
if (recorder.getState() != AudioRecord.STATE_INITIALIZED) {
throw new IllegalArgumentException(
String.format(
"unable to initialize AudioRecord instance, sample rate: %d, channels: %d, buffer: %d",
sampleRate, Constants.DEFAULT_CHANNEL_CONFIG, bufferSize));
}
return recorder;
}
/**
* Gets an AudioTrack object using the current playback settings
*
* @param context Context which we are getting recorder for
*/
public static AudioTrack getPlayer(Context context) throws IllegalArgumentException {
AudioTrack player = null;
int sampleRate = PreferenceHelper.getSampleRate(context);
int bufferSizeAdjuster = PreferenceHelper.getBufferSizeAdjuster(context);
Log.i(
TAG_AUDIOHELPER,
String.format(
"AudioTrack initialized with saved configuration! sample rate: %d, buffer adjuster: %d",
sampleRate, bufferSizeAdjuster));
int bufferSize =
AudioTrack.getMinBufferSize(
sampleRate, Constants.DEFAULT_CHANNEL_CONFIG, Constants.DEFAULT_PCM_FORMAT)
* bufferSizeAdjuster;
player =
new AudioTrack(
AudioManager.STREAM_MUSIC,
sampleRate,
Constants.DEFAULT_CHANNEL_CONFIG,
Constants.DEFAULT_PCM_FORMAT,
bufferSize,
AudioTrack.MODE_STREAM);
if (player.getState() != AudioTrack.STATE_INITIALIZED) {
throw new IllegalArgumentException(
String.format(
"unable to initialize AudioTrack instance, sample rate: %d, channels: %d, buffer: %d",
sampleRate, Constants.DEFAULT_CHANNEL_CONFIG, bufferSize));
}
return player;
}
/**
* Attempts to autoconfigure current Context's sample rate, buffer size, or buffer size adjuster .
* Will show a pop-up warning if configuration failed to initialize an AudioRecord instance.
*
* @param context Context which we are attempting to configure
*/
public static void configureRecorder(Context context) {
AudioRecord rec = null;
int sampleRate = PreferenceHelper.getSampleRate(context);
int bufferSize = PreferenceHelper.getBufferSize(context);
int bufferSizeAdjuster = PreferenceHelper.getBufferSizeAdjuster(context);
if (sampleRate < 0 || bufferSize < 0 || bufferSizeAdjuster < 0) {
if (AudioHelper.isSamsungGalaxyS()) {
// bypass checking, go with defaults
bufferSize = 6144;
bufferSizeAdjuster = 1;
sampleRate = Constants.SAMPLE_RATE_22KHZ;
Log.i(
TAG_AUDIOHELPER,
String.format(
"AudioRecord initially configured! sample rate: %d, buffer size: %d, buffer size adjuster: %d",
sampleRate, bufferSize, bufferSizeAdjuster));
PreferenceHelper.setSampleRate(context, sampleRate);
PreferenceHelper.setBufferSize(context, bufferSize);
PreferenceHelper.setBufferSizeAdjuster(context, bufferSizeAdjuster);
return;
}
if (bufferSizeAdjuster < 1) {
// clamp buffer size adjuster to minimum of 1
bufferSizeAdjuster = 1;
}
// try a new sample rates until we find one that works
do {
switch (sampleRate) {
case -1:
// set the default to 22050Hz, so slower devices perform
// better
sampleRate = Constants.SAMPLE_RATE_22KHZ;
break;
case Constants.SAMPLE_RATE_44KHZ:
sampleRate = Constants.SAMPLE_RATE_22KHZ;
break;
case Constants.SAMPLE_RATE_22KHZ:
sampleRate = Constants.SAMPLE_RATE_11KHZ;
break;
case Constants.SAMPLE_RATE_11KHZ:
sampleRate = Constants.SAMPLE_RATE_8KHZ;
break;
default:
// start the loop over again with a larger buffer size
bufferSizeAdjuster *= 2;
sampleRate = Constants.SAMPLE_RATE_22KHZ;
}
bufferSize =
AudioRecord.getMinBufferSize(
sampleRate, Constants.DEFAULT_CHANNEL_CONFIG, Constants.DEFAULT_PCM_FORMAT);
if (bufferSize != AudioRecord.ERROR && bufferSize != AudioRecord.ERROR_BAD_VALUE) {
if (bufferSize <= 4096) {
bufferSize = 4096 * 3 / 2;
}
rec =
new AudioRecord(
AudioSource.MIC,
sampleRate,
Constants.DEFAULT_CHANNEL_CONFIG,
Constants.DEFAULT_PCM_FORMAT,
bufferSize * bufferSizeAdjuster);
if (rec != null && rec.getState() == AudioRecord.STATE_INITIALIZED) {
rec.release();
rec = null;
Log.i(
TAG_AUDIOHELPER,
String.format(
"AudioRecord initially configured! sample rate: %d, buffer size: %d, buffer size adjuster: %d",
sampleRate, bufferSize, bufferSizeAdjuster));
PreferenceHelper.setSampleRate(context, sampleRate);
PreferenceHelper.setBufferSize(context, bufferSize);
PreferenceHelper.setBufferSizeAdjuster(context, bufferSizeAdjuster);
return;
}
if (rec != null) {
rec.release();
rec = null;
}
}
} while (bufferSizeAdjuster < Constants.DEFAULT_BUFFER_LIMIT);
// failure to configure!
DialogHelper.showWarning(
context,
R.string.unable_to_configure_audio_title,
R.string.unable_to_configure_audio_warning);
}
}
