这是pattern producer:
生产者类是执行长期任务(filterFrame):
import java.util.concurrent.Callable;
public class Producer implements Callable<Frame> {
private final Frame frame;
public Producer(Frame frame) {
this.frame = frame;
}
@Override
public Frame call() throws Exception {
return filterFrame(frame);
}
}
消费类店面帧:
import java.util.Map;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Future;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
public class Consumer implements Runnable {
private final BlockingQueue<Map.Entry<Long, Future<Frame>>> queue;
public Boolean continueProducing = Boolean.TRUE;
private final FFmpegFrameRecorder recorder;
public Consumer(FFmpegFrameRecorder recorder,
BlockingQueue<Map.Entry<Long, Future<Frame>>> queue) {
this.recorder = recorder;
this.queue = queue;
}
@Override
public void run() {
try {
Map.Entry<Long, Future<Frame>> entry = this.queue.poll(2, TimeUnit.SECONDS);
Frame editedFrame = entry.getValue().get();
recorder.setTimestamp(entry.getKey());
recorder.record(editedFrame);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
和管理任务的主要部分并关机threadPool
try (FFmpegFrameGrabber grabber = createGrabber()) {
grabber.start();
try (FFmpegFrameRecorder recorder = createRecorder(grabber)) {
recorder.start();
Frame frame;
ExecutorService threadPool = Executors.newWorkStealingPool();
BlockingQueue<Map.Entry<Long, Future<Frame>>> queue = new LinkedBlockingQueue<>();
threadPool.execute(new Consumer(recorder, queue));
while ((frame = grabber.grab()) != null) {
queue.put(new Map.Entry<Long, Future<Frame>>() {
@Override
public Long getKey() {
return grabber.getTimestamp();
}
@Override
public Future<Frame> getValue() {
return threadPool.submit(new Producer(frame)); // Frame editedFrame = filterFrame(frame); //This takes a long time.
}
@Override
public Future<Frame> setValue(Future<Frame> value) {
return null;
}
});
}
threadPool.shutdownNow();
}
}
注意:它没有复制粘贴解决方案,需要为您的代码进行一些自定义。如果你分享更多的信息,我会改变它
你的filterFrame方法(你没有显示)是否利用多线程,所以它的执行速度更快? – auburg
是的,你可以。但你应该考虑同步帧。可能你可以像这里https://docs.oracle.com/javase/tutorial/essential/concurrency/forkjoin.html那样在filterFrame中分割工作。这将是更明智的 –
@VladislavKysliy是否有可能像4线程一样执行器服务,然后过滤将每4帧完成,帧将被记录在他们抓住相同的序列? –