android - 调用setDataSource(FileDescriptor)方法时出现异常(失败。: status=0x80000000)

Question

我正在开发一个视频流应用程序，但在使用 FileDescriptor 调用 set setDataSource 时遇到了问题。 我希望我的应用程序在下载视频时播放视频，所以一旦我获得最小字节数，我会将这些字节移动到另一个文件中，以便在下载原始文件时可以在另一个文件中播放。

所以，我检查是否可以像这样启动每个数据包的媒体播放器:

if (mediaPlayer == null) {
                    // Only create the MediaPlayer once we have the minimum
                    // buffered data
                    if (totalKbRead >= INTIAL_KB_BUFFER) {
                        try {
                            startMediaPlayer();
                        } catch (Exception e) {
                            Log.e(getClass().getName(),
                                    "Error copying buffered conent.", e);
                        }
                    }
                } else if (mediaPlayer.getDuration()
                        - mediaPlayer.getCurrentPosition() <= 1000) {
                    transferBufferToMediaPlayer();
                }
}

这是startMediaPlayer方法代码:

private void startMediaPlayer() {
        try {
            File bufferedFile = new File(context.getCacheDir(), "playingMedia"
                    + (counter++) + ".dat");

            // bufferedFile is the one that'll be played
            moveFile(downloadingMediaFile, bufferedFile);

            mediaPlayer = createMediaPlayer(bufferedFile);

            mediaPlayer.start();

            playButton.setEnabled(true);
        } catch (IOException e) {
            Log.e(getClass().getName(), "Error initializing the MediaPlayer.",
                    e);
            return;
}

我使用以下代码移动文件:

public void moveFile(File oldLocation, File newLocation) throws IOException {

        if (oldLocation.exists()) {
            BufferedInputStream reader = new BufferedInputStream(
                    new FileInputStream(oldLocation));
            BufferedOutputStream writer = new BufferedOutputStream(
                    new FileOutputStream(newLocation, false));
            try {
                byte[] buff = new byte[8192];
                int numChars;
                while ((numChars = reader.read(buff, 0, buff.length)) != -1) {
                    writer.write(buff, 0, numChars);
                }
            } catch (IOException ex) {
                throw new IOException("IOException when transferring "
                        + oldLocation.getPath() + " to "
                        + newLocation.getPath());
            } finally {
                try {
                    if (reader != null) {
                        writer.flush();
                        writer.close();
                        reader.close();
                    }
                } catch (IOException ex) {
                    Log.e(getClass().getName(),
                            "Error closing files when transferring "
                                    + oldLocation.getPath() + " to "
                                    + newLocation.getPath());
                }
            }
        } else {
            throw new IOException(
                    "Old location does not exist when transferring "
                            + oldLocation.getPath() + " to "
                            + newLocation.getPath());
        }
    }
}

我终于在这里创建了 MediaPlayer 对象:

private MediaPlayer createMediaPlayer(File mediaFile) throws IOException {

        if(mediaPlayer != null){
            mediaPlayer.release();
        }

        MediaPlayer mPlayer = new MediaPlayer();
        mPlayer.setOnErrorListener(new MediaPlayer.OnErrorListener() {
            public boolean onError(MediaPlayer mp, int what, int extra) {
                Log.e(getClass().getName(), "Error in MediaPlayer: (" + what
                        + ") with extra (" + extra + ")");
                return false;
            }
        });

        // It appears that for security/permission reasons, it is better to pass
        // a FileDescriptor rather than a direct path to the File.
        // Also I have seen errors such as "PVMFErrNotSupported" and
        // "Prepare failed.: status=0x1" if a file path String is passed to
        // setDataSource().
        FileInputStream fis = new FileInputStream(mediaFile);

        mPlayer.reset();
        FileDescriptor fd = fis.getFD();
        mPlayer.setDataSource(fd);       // IM GETTING THE EXCEPTION HERE
        mPlayer.setDisplay(mHolder);
        mPlayer.prepare();
        return mPlayer;
    }

这是我得到的异常:

01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229): Error initializing the MediaPlayer.
01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229): java.io.IOException: setDataSourceFD failed.: status=0x80000000
01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229):     at android.media.MediaPlayer.setDataSource(Native Method)
01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229):     at android.media.MediaPlayer.setDataSource(MediaPlayer.java:854)
01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229):     at org.pfc.utils.StreamingMediaPlayer.createMediaPlayer(StreamingMediaPlayer.java:266)
01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229):     at org.pfc.utils.StreamingMediaPlayer.startMediaPlayer(StreamingMediaPlayer.java:226)
01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229):     at org.pfc.utils.StreamingMediaPlayer.access$4(StreamingMediaPlayer.java:203)
01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229):     at org.pfc.utils.StreamingMediaPlayer$2.run(StreamingMediaPlayer.java:183)
01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229):     at android.os.Handler.handleCallback(Handler.java:587)
01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229):     at android.os.Handler.dispatchMessage(Handler.java:92)
01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229):     at android.os.Looper.loop(Looper.java:144)
01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229):     at android.app.ActivityThread.main(ActivityThread.java:4937)
01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229):     at java.lang.reflect.Method.invokeNative(Native Method)
01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229):     at java.lang.reflect.Method.invoke(Method.java:521)
01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-25 16:03:15.663: ERROR/org.pfc.utils.StreamingMediaPlayer(2229):     at dalvik.system.NativeStart.main(Native Method)

我整个早上都被困在这里，我真的没有找到有关该错误的信息。有些人告诉我使用文件路径，但我得到了我在评论中谈到的另一个异常(就在 FileInputStream 创建上)。

我真的迷路了，非常感谢任何帮助

Answer 1

别忘了权限

<uses-permission android:name="android.permission.INTERNET" />