AudioExecutor.java
/*
* Copyright 2023 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.camera.core.impl.utils.executor;
import android.os.Process;
import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.camera.core.CameraXThreads;
import java.util.Locale;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
/**
* A singleton executor which is suitable for audio I/O tasks.
*/
@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
public class AudioExecutor implements Executor {
private static volatile Executor sExecutor;
private final ExecutorService mAudioService =
Executors.newFixedThreadPool(
2,
new ThreadFactory() {
private static final String THREAD_NAME_STEM =
CameraXThreads.TAG + "camerax_audio_%d";
private final AtomicInteger mThreadId = new AtomicInteger(0);
@Override
public Thread newThread(final Runnable r) {
Runnable wrapper = () -> {
Process.setThreadPriority(Process.THREAD_PRIORITY_AUDIO);
r.run();
};
Thread t = new Thread(wrapper);
t.setName(
String.format(
Locale.US,
THREAD_NAME_STEM,
mThreadId.getAndIncrement()));
return t;
}
});
static Executor getInstance() {
if (sExecutor != null) {
return sExecutor;
}
synchronized (AudioExecutor.class) {
if (sExecutor == null) {
sExecutor = new AudioExecutor();
}
}
return sExecutor;
}
@Override
public void execute(@NonNull Runnable command) {
mAudioService.execute(command);
}
}