在C#中从Android到媒体播放器的视频流

时间:2012-09-27 08:43:13

标签: c# android video-streaming

我想制作一个简单的视频流。我使用的应用程序是使用c#的android和简单媒体播放器。我审查的大多数代码都会有POST方法到ip服务器。同时我的应用程序正在使用gsm网络,它需要在传输数据媒体时使用数据包。

我的第一步是拥有一个可以记录的android应用程序。这一步完成了。这是我的代码。

public class Videotest1Activity extends Activity implements 
    SurfaceHolder.Callback, OnInfoListener, OnErrorListener{

    Camera camera;
VideoView videoView;
SurfaceHolder holder;
TextView msg;
Button initBtn, startBtn, stopBtn, playBtn, stprevBtn;
MediaRecorder recorder;

String outputFileName;
static final String TAG = "RecordVideo";
int maxDuration = 7000;//7sec
int frameRate = 1;//15

String serverIP = "172.19.117.12";
int serverPort = 2000;
Socket socket;

int mCount;
//TimerThread mTimer;

Chronometer chronometer;

LocalSocket receiver,sender;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_videotest1);

    videoView = (VideoView) findViewById(R.id.videoView1);
    initBtn = (Button) findViewById(R.id.initialize);
    startBtn = (Button) findViewById(R.id.button1);
    stopBtn = (Button) findViewById(R.id.button3);
    msg = (TextView) findViewById(R.id.textView1);
    playBtn = (Button) findViewById(R.id.reviewBtn);
    stprevBtn = (Button) findViewById(R.id.stprevBtn);
    chronometer = (Chronometer) findViewById(R.id.chronometer1);

    /*
    mTimer= new TimerThread();
    mTimer.setOnAlarmListener(mSTimer_OnAlarm);
    mTimer.setPeriod(100);
    */
}

public void buttonTapped(View view){
    switch(view.getId()){
    case R.id.initialize:
        initRecorder();
        break;
    case R.id.button1:
        beginRecording();
        break;
    case R.id.button3:
        stopRecording();
        break;
    case R.id.reviewBtn:
        playRecording();
        break;
    case R.id.stprevBtn:
        stopPlayback();
        break;
    }
}

@Override
public void onError(MediaRecorder mr, int what, int extra) {
    Log.e(TAG, "Record error");
    stopRecording();
    Toast.makeText(this, "Recording limit reached", 2500).show();
}

@Override
public void onInfo(MediaRecorder mr, int what, int extra) {
    Log.i(TAG, "recording event");
    if(what == MediaRecorder.MEDIA_RECORDER_INFO_MAX_DURATION_REACHED){
        Log.i(TAG, "...max duration reached");
        stopRecording();
        Toast.makeText(this, "Recording limit info", 2500).show();
    }
}

@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {

}

@Override
public void surfaceCreated(SurfaceHolder arg0) {
    Log.v(TAG, "in surfaceCreated");

    try{
        camera.setPreviewDisplay(holder);
        camera.startPreview();
    }catch(IOException e){
        Log.v(TAG, "Could not start the preview");
        e.printStackTrace();
    }
    initBtn.setEnabled(true);
    startBtn.setEnabled(true);
    stopBtn.setEnabled(true);
}

@Override
public void surfaceDestroyed(SurfaceHolder arg0) {

}

protected void onResume(){
    Log.v(TAG, "in onResume");
    super.onResume();
    initBtn.setEnabled(false);
    startBtn.setEnabled(false);
    stopBtn.setEnabled(false);
    playBtn.setEnabled(false);
    stprevBtn.setEnabled(false);
    if(!initCamera())
        finish();
}

public boolean initCamera(){
    try{
        camera = Camera.open();
        Camera.Parameters camParam = camera.getParameters();
        camera.lock();
        holder = videoView.getHolder();
        holder.addCallback(this);
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        //Thread thread = new Thread(new hantarThread());
        //thread.start();
    }catch(RuntimeException re){
        Log.v(TAG, "Could not initialize the camera");
        re.printStackTrace();
        return false;
    }
    return true;
}

public void initRecorder(){
    if(recorder != null)return;     
    outputFileName = Environment.getExternalStorageDirectory() + "/videooutput.mp4";

    File outputFile = new File(outputFileName);
    if(outputFile.exists())
        outputFile.delete();//knp nk dlt?

    try{
        Toast.makeText(this, "InitRecord", 2500).show();
        camera.stopPreview();
        camera.unlock();
        recorder = new MediaRecorder();
        recorder.setCamera(camera);

        recorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
        recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        recorder.setVideoSize(176, 144);
        recorder.setVideoFrameRate(15);//15
        recorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);//mpeg_4
        recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        recorder.setMaxDuration(60000);
        recorder.setPreviewDisplay(holder.getSurface());
        recorder.setOutputFile(outputFileName);

        recorder.prepare();
        Log.v(TAG, "MediaRecorder initialized");
        initBtn.setEnabled(false);
        startBtn.setEnabled(true);
    }catch(Exception e){
        Log.v(TAG, "MediaRecorder failed");
        e.printStackTrace();
    }
}

public void beginRecording(){
    //mCount = 0;
    //mTimer.start();

    try{
        Log.v(TAG, "start Recording begin");

        int stoppedMilliseconds = 0;
          String chronoText = chronometer.getText().toString();
          String array[] = chronoText.split(":");
          if (array.length == 2) {
            stoppedMilliseconds = Integer.parseInt(array[0]) * 60 * 1000
                + Integer.parseInt(array[1]) * 1000;
          } else if (array.length == 3) {
            stoppedMilliseconds = Integer.parseInt(array[0]) * 60 * 60 * 1000 
                + Integer.parseInt(array[1]) * 60 * 1000
                + Integer.parseInt(array[2]) * 1000;
          }
          chronometer.setBase(SystemClock.elapsedRealtime() - stoppedMilliseconds);

        //chronometer.setBase(SystemClock.elapsedRealtime());           
        chronometer.start();
        Log.v(TAG, "timer start");
        long dTime = chronometer.getDrawingTime();
        long autoLink = chronometer.getAutoLinkMask();          

        Log.v(TAG, "getDrawingTime: " + dTime);
        Log.v(TAG, "AutoLink: " + autoLink);

        recorder.setOnInfoListener(this);
        recorder.setOnErrorListener(this);
        recorder.start();               

        msg.setText("Recording");
        startBtn.setEnabled(false);
        stopBtn.setEnabled(true);
    }catch(Exception e){
        Log.v(TAG, "start Recording failed");
        e.printStackTrace();
    }


}

public void stopRecording(){
    if(recorder != null){
        recorder.setOnErrorListener(null);
        recorder.setOnInfoListener(null);
        try{
            recorder.stop();
            Log.v(TAG, "stop Record Begin");

            chronometer.stop();
            Log.v(TAG, "Timer stop");
            //mTimer.stop();
        }catch(IllegalStateException e){
            Log.e(TAG, "stop is ILLEGAL");
        }
        releaseRecorder();
        msg.setText("");
        releaseCamera();
        startBtn.setEnabled(false);
        stopBtn.setEnabled(false);
        playBtn.setEnabled(true);
    }
    else{
        Log.v(TAG, "video cannot stop. Video null");
        long autoLink = chronometer.getAutoLinkMask();
        Log.v(TAG, "stop aLink: " + autoLink);                              
        long elapsedMillis = SystemClock.elapsedRealtime() - chronometer.getBase();
        Log.v(TAG, "elapsedMillis: " + elapsedMillis);
    }
}

private void releaseCamera(){
    if(camera != null){
        try{
            camera.reconnect();
        }catch(IOException e){
            e.printStackTrace();
        }
        camera.release();
        camera = null;
    }
}

private void releaseRecorder(){
    if(recorder != null){
        recorder.release();
        recorder = null;
    }
}

private void playRecording(){
    MediaController mc = new MediaController(this);
    videoView.setMediaController(mc);
    videoView.setVideoPath(outputFileName);
    videoView.start();
    stprevBtn.setEnabled(true);
}

private void stopPlayback(){
    videoView.stopPlayback();
}       

}

}

我做的下一步是让媒体播放器可以播放videooutput.mp4。在这里,为了使它播放,它首先必须加载视频然后播放。好吧,这是第二步。它也运作良好。这是我的代码。

private void button6_Click_1(object sender, EventArgs e)
    {
        if (openFileDialog1.ShowDialog() == DialogResult.OK)
        {
            // create video source
            FileVideoSource fileSource = new FileVideoSource(openFileDialog1.FileName);

            // open it
            OpenVideoSource(fileSource);
        }
    }

    // Open video source
    private void OpenVideoSource(IVideoSource source)
    {
        // set busy cursor
        this.Cursor = Cursors.WaitCursor;
        // stop current video source
        CloseCurrentVideoSource();
        // start new video source
        videoSourcePlayer.VideoSource = source;
        videoSourcePlayer.Start();                        
        // reset stop watch
        stopWatch = null;
        // start timer
        videoTimer.Start();

        this.Cursor = Cursors.Default;
    }

    // New frame received by the player
    private void videoSourcePlayer_NewFrame(object sender, ref Bitmap image)
    {
        DateTime now = DateTime.Now;
        Graphics g = Graphics.FromImage(image);

        // paint current time
        SolidBrush brush = new SolidBrush(Color.Red);
        g.DrawString(now.ToString(), this.Font, brush, new PointF(5, 5));
        brush.Dispose();

        g.Dispose();
    }

    // Close video source if it is running
    private void CloseCurrentVideoSource()
    {
        if (videoSourcePlayer.VideoSource != null)
        {
            videoSourcePlayer.SignalToStop();
            // wait ~ 3 seconds
            for (int i = 0; i < 30; i++)
            {
                if (!videoSourcePlayer.IsRunning)
                    break;
                System.Threading.Thread.Sleep(100);
            }
            if (videoSourcePlayer.IsRunning)
            {
                videoSourcePlayer.Stop();
            }
            videoSourcePlayer.VideoSource = null;
        }
    }

我正在使用AForge为c#中的媒体播放器。我所做的就是添加AForge.Controls,AForge.Video和AForge.Video.DirectShow的参考资料。

现在,我需要做的是逐字节地将媒体数据发送到媒体播放器(c#)。我不知道如何实现这一目标。我还找到了将视频带到服务器的样本编码IP camera android。但是,我仍然没有在我的应用程序中做到这一点的线索。

请注意,gsm将需要使用的SIM卡号码以及调制解调器gsm的端口号。

任何人都可以帮助我。或者也许给我一些修改代码的想法。任何帮助表示赞赏。谢谢你的进步。

0 个答案:

没有答案