我正在尝试使用PipedInputStream&来实现线程循环缓冲区. PipedOutputStream,但是每次我在Decoder runnable中进入mHead.write时,它都会锁定.我认为使用单独的线程时没有死锁的机会.

    private class DecoderTask implements Runnable{

    @Override
    public void run() {
        while(!mStop){
            try {
                    Log.d(TAG,"trying to write");
        mHead.write(decode( 0, 1000));
            mHead.flush();
            Log.d(TAG,"Decoded");
            } catch (DecoderException e) {
                Log.e(TAG,e.toString());
            } catch (IOException e) {
                Log.e(TAG,e.toString());
            }
        }
    }

}
private class WriteTask implements Runnable{

    @Override
    public void run() {
        while(!mStop){
            try {
                                 Log.d(TAG,"trying to read");
                 int read = mTail.read(mByteSlave, 0, mByteSlave.length);
                 mAudioTrack.flush();
                                 mAudioTrack.write(mByteSlave,0,read);
                                 Log.d(TAG,"read");                 
            } catch (IOException e) {
                Log.e(TAG,e.toString());
            }
        }
    }

}


//in some function
mTail = new PipedInputStream();
mHead = new PipedOutputStream(mTail);
mByteSlave = new byte[BUF];
mT1 = new Thread(new DecoderTask(), "Reader");
mT2 = new Thread(new WriteTask(), "Writer");
mT1.start();
mT2.start();
return;

编辑：这是我的服务http://pastie.org/1179792的完整源

logcat打印出：

试图阅读
试图写

解决方法:

该程序不会阻塞,只是非常非常缓慢且效率低下.它使用100％CPU.问题是如果(mTail.available()> = mByteSlave.length)-在大多数情况下这将返回false,因此您在该线程中会遇到繁忙的循环.如果您可以摆脱这种情况,那就去做.然后这个问题就解决了.如果不能,它将变得更加复杂…

还有另一个问题：PipedInputStream.read返回一个int.您需要使用：

int len = mTail.read(mByteSlave, 0, mByteSlave.length);
mAudioTrack.write(mByteSlave, 0, len);

除此之外,我在这段代码中找不到任何错误.我完整的测试用例如下所示：

import java.io.*;
public class Test2 {
    PipedOutputStream mHead;
    PipedInputStream mTail;
    byte[] mByteSlave = new byte[1024];
    boolean mStop;
    public static void main(String... ar) throws Exception {
        new Test2().run();
    }
    void run() throws Exception {
        mTail = new PipedInputStream();
        mHead = new PipedOutputStream(mTail);
        Thread mT1 = new Thread(new DecoderTask(), "Reader");
        Thread mT2 = new Thread(new WriteTask(), "Writer");
        mT1.start();
        mT2.start();
    }
    class DecoderTask implements Runnable {
        public void run() {
            while (!mStop) {
                try {
                    mHead.write(new byte[3000]);
                    mHead.flush();
                    System.out.println("decoded 3000");
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    class WriteTask implements Runnable {
        public void run() {
            while (!mStop) {
                try {
                    int len = mTail.read(mByteSlave, 0, mByteSlave.length);
                    if (len < 0) break; // EOF
                    // mAudioTrack.write(mByteSlave, 0, len);
                    // mAudioTrack.flush();
                    System.out.println("written " + len);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}