// Audio
public static void audioInit(
int sampleRate, boolean is16Bit, boolean isStereo, int desiredFrames) {
int channelConfig =
isStereo
? AudioFormat.CHANNEL_CONFIGURATION_STEREO
: AudioFormat.CHANNEL_CONFIGURATION_MONO;
int audioFormat = is16Bit ? AudioFormat.ENCODING_PCM_16BIT : AudioFormat.ENCODING_PCM_8BIT;
int frameSize = (isStereo ? 2 : 1) * (is16Bit ? 2 : 1);
Log.v(
"SDL",
"SDL audio: wanted "
+ (isStereo ? "stereo" : "mono")
+ " "
+ (is16Bit ? "16-bit" : "8-bit")
+ " "
+ (sampleRate / 1000f)
+ "kHz, "
+ desiredFrames
+ " frames buffer");
// Let the user pick a larger buffer if they really want -- but ye
// gods they probably shouldn't, the minimums are horrifyingly high
// latency already
desiredFrames =
Math.max(
desiredFrames,
(AudioTrack.getMinBufferSize(sampleRate, channelConfig, audioFormat) + frameSize - 1)
/ frameSize);
mAudioTrack =
new AudioTrack(
AudioManager.STREAM_MUSIC,
sampleRate,
channelConfig,
audioFormat,
desiredFrames * frameSize,
AudioTrack.MODE_STREAM);
audioStartThread();
Log.v(
"SDL",
"SDL audio: got "
+ ((mAudioTrack.getChannelCount() >= 2) ? "stereo" : "mono")
+ " "
+ ((mAudioTrack.getAudioFormat() == AudioFormat.ENCODING_PCM_16BIT)
? "16-bit"
: "8-bit")
+ " "
+ (mAudioTrack.getSampleRate() / 1000f)
+ "kHz, "
+ desiredFrames
+ " frames buffer");
}
// Audio
public static int audioInit(
int sampleRate, boolean is16Bit, boolean isStereo, int desiredFrames) {
int channelConfig =
isStereo
? AudioFormat.CHANNEL_CONFIGURATION_STEREO
: AudioFormat.CHANNEL_CONFIGURATION_MONO;
int audioFormat = is16Bit ? AudioFormat.ENCODING_PCM_16BIT : AudioFormat.ENCODING_PCM_8BIT;
int frameSize = (isStereo ? 2 : 1) * (is16Bit ? 2 : 1);
Log.v(
"SDL",
"SDL audio: wanted "
+ (isStereo ? "stereo" : "mono")
+ " "
+ (is16Bit ? "16-bit" : "8-bit")
+ " "
+ (sampleRate / 1000f)
+ "kHz, "
+ desiredFrames
+ " frames buffer");
// Let the user pick a larger buffer if they really want -- but ye
// gods they probably shouldn't, the minimums are horrifyingly high
// latency already
desiredFrames =
Math.max(
desiredFrames,
(AudioTrack.getMinBufferSize(sampleRate, channelConfig, audioFormat) + frameSize - 1)
/ frameSize);
if (mAudioTrack == null) {
mAudioTrack =
new AudioTrack(
AudioManager.STREAM_MUSIC,
sampleRate,
channelConfig,
audioFormat,
desiredFrames * frameSize,
AudioTrack.MODE_STREAM);
// Instantiating AudioTrack can "succeed" without an exception and the track may still be
// invalid
// Ref:
// https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/media/java/android/media/AudioTrack.java
// Ref: http://developer.android.com/reference/android/media/AudioTrack.html#getState()
if (mAudioTrack.getState() != AudioTrack.STATE_INITIALIZED) {
Log.e("SDL", "Failed during initialization of Audio Track");
mAudioTrack = null;
return -1;
}
mAudioTrack.play();
}
Log.v(
"SDL",
"SDL audio: got "
+ ((mAudioTrack.getChannelCount() >= 2) ? "stereo" : "mono")
+ " "
+ ((mAudioTrack.getAudioFormat() == AudioFormat.ENCODING_PCM_16BIT)
? "16-bit"
: "8-bit")
+ " "
+ (mAudioTrack.getSampleRate() / 1000f)
+ "kHz, "
+ desiredFrames
+ " frames buffer");
return 0;
}
/**
* 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;
}
