/**
* Opens a connection to the media source of the associated <tt>DataSource</tt>.
*
* @throws IOException if anything goes wrong while opening a connection to the media source of
* the associated <tt>DataSource</tt>
*/
public synchronized void connect() throws IOException {
javax.media.format.AudioFormat af = (javax.media.format.AudioFormat) getFormat();
int channels = af.getChannels();
int channelConfig;
switch (channels) {
case Format.NOT_SPECIFIED:
case 1:
channelConfig = AudioFormat.CHANNEL_IN_MONO;
break;
case 2:
channelConfig = AudioFormat.CHANNEL_IN_STEREO;
break;
default:
throw new IOException("channels");
}
int sampleSizeInBits = af.getSampleSizeInBits();
int audioFormat;
switch (sampleSizeInBits) {
case 8:
audioFormat = AudioFormat.ENCODING_PCM_8BIT;
break;
case 16:
audioFormat = AudioFormat.ENCODING_PCM_16BIT;
break;
default:
throw new IOException("sampleSizeInBits");
}
double sampleRate = af.getSampleRate();
length =
(int)
Math.round(
20 /* milliseconds */ * (sampleRate / 1000) * channels * (sampleSizeInBits / 8));
/*
* Apart from the thread in which #read(Buffer) is executed, use the
* thread priority for the thread which will create the AudioRecord.
*/
setThreadPriority();
try {
int minBufferSize =
AudioRecord.getMinBufferSize((int) sampleRate, channelConfig, audioFormat);
audioRecord =
new AudioRecord(
MediaRecorder.AudioSource.DEFAULT,
(int) sampleRate,
channelConfig,
audioFormat,
Math.max(length, minBufferSize));
// tries to configure audio effects if available
configureEffects();
} catch (IllegalArgumentException iae) {
IOException ioe = new IOException();
ioe.initCause(iae);
throw ioe;
}
setThreadPriority = true;
}
