public static Object 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")
+ " "
+ ((float) 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")
+ " "
+ ((float) mAudioTrack.getSampleRate() / 1000f)
+ "kHz, "
+ desiredFrames
+ " frames buffer");
if (is16Bit) {
buf = new short[desiredFrames * (isStereo ? 2 : 1)];
} else {
buf = new byte[desiredFrames * (isStereo ? 2 : 1)];
}
return buf;
}
