最近EasyPusher针对UVC摄像头做了适配.我们结合了与EasyPusher,支持将UVC摄像头的视频推送到RTSP服务器上.在此特别感谢UVCCamera这个牛逼的项目!
来看看是怎么操作UVC摄像头的吧.我们实现了一个专门检测UVC摄像头的服务:UVCCameraService类,主要代码如下:
监听
mUSBMonitor = new USBMonitor(this, new USBMonitor.OnDeviceConnectListener() { @Override public void onAttach(final UsbDevice device) { Log.v(TAG, "onAttach:" + device); mUSBMonitor.requestPermission(device); } @Override public void onConnect(final UsbDevice device, final USBMonitor.UsbControlBlock ctrlBlock, final boolean createNew) { releaseCamera(); if (BuildConfig.DEBUG) Log.v(TAG, "onConnect:"); try { final UVCCamera camera = new MyUVCCamera(); camera.open(ctrlBlock); camera.setStatusCallback(new IStatusCallback() { // ... uvc 摄像头链接成功 Toast.makeText(UVCCameraService.this, "UVCCamera connected!", Toast.LENGTH_SHORT).show(); if (device != null) cameras.append(device.getDeviceId(), camera); }catch (Exception ex){ ex.printStackTrace(); } } @Override public void onDisconnect(final UsbDevice device, final USBMonitor.UsbControlBlock ctrlBlock) { // ... uvc 摄像头断开链接 if (device != null) { UVCCamera camera = cameras.get(device.getDeviceId()); if (mUVCCamera == camera) { mUVCCamera = null; Toast.makeText(UVCCameraService.this, "UVCCamera disconnected!", Toast.LENGTH_SHORT).show(); liveData.postValue(null); } cameras.remove(device.getDeviceId()); }else { Toast.makeText(UVCCameraService.this, "UVCCamera disconnected!", Toast.LENGTH_SHORT).show(); mUVCCamera = null; liveData.postValue(null); } } @Override public void onCancel(UsbDevice usbDevice) { releaseCamera(); } @Override public void onDettach(final UsbDevice device) { Log.v(TAG, "onDettach:"); releaseCamera();// AppContext.getInstance().bus.post(new UVCCameraDisconnect()); } }); 这个类主要实现UVC摄像头的监听\链接\销毁\反监听.当有UVC摄像头链接成功后,会创建一个mUVCCamera对象.
然后在MediaStream里, 我们改造了switchCamera,当参数传2时,表示要切换到UVCCamera(0,1分别表示切换到后置\前置摄像头).
创建
在创建摄像头时,如果是要创建uvc摄像头,那直接从服务里面获取之前创建的mUVCCamera实例:
if (mCameraId == 2) { UVCCamera value = UVCCameraService.liveData.getValue(); if (value != null) { // uvc camera. uvcCamera = value; value.setPreviewSize(width, height,1, 30, UVCCamera.PIXEL_FORMAT_YUV420SP,1.0f); return; // value.startPreview(); }else{ Log.i(TAG, "NO UVCCamera"); uvcError = new Exception("no uvccamera connected!"); return; } // mCameraId = 0; } 预览
在预览时,如果uvc摄像头已经创建了,那执行uvc摄像头的预览操作:
UVCCamera value = uvcCamera;if (value != null) { SurfaceTexture holder = mSurfaceHolderRef.get(); if (holder != null) { value.setPreviewTexture(holder); } try { value.setFrameCallback(uvcFrameCallback, UVCCamera.PIXEL_FORMAT_YUV420SP/*UVCCamera.PIXEL_FORMAT_NV21*/); value.startPreview(); cameraPreviewResolution.postValue(new int[]{width, height}); }catch (Throwable e){ uvcError = e; }} 这里我们选的colorFormat为PIXEL_FORMAT_YUV420SP 相当于标准摄像头的NV21格式.
关闭预览
同理,关闭时,调用的是uvc摄像头的关闭.
UVCCamera value = uvcCamera; if (value != null) { value.stopPreview(); } 销毁
因为我们这里并没有实质性的创建,所以销毁时也仅将实例置为null就可以了.
UVCCamera value = uvcCamera;if (value != null) { // value.destroy(); uvcCamera = null;} 有了这些操作,我们看看上层怎么调用,
首先需要在Manifest里面增加若干代码,具体详见UVCCamera工程说明.如下:
然后,的代码在UVCActivity里,这个类可以在library分支的myapplication工程里找到.即.
启动或者停止UVC摄像头推送:
public void onPush(View view) { // 异步获取到MediaStream对象. getMediaStream().subscribe(new Consumer () { @Override public void accept(final MediaStream mediaStream) throws Exception { // 判断当前的推送状态. MediaStream.PushingState state = mediaStream.getPushingState(); if (state != null && state.state > 0) { // 当前正在推送,那终止推送和预览 mediaStream.stopStream(); mediaStream.closeCameraPreview(); }else{ // switch 0表示后置,1表示前置,2表示UVC摄像头 // 异步开启UVC摄像头 RxHelper.single(mediaStream.switchCamera(2), null).subscribe(new Consumer 这样,整个推送就完成了.如果一切顺利,应当能在VLC播放出来UVC摄像头的视频了~~
我们再看看如何录像.也非常简单…
public void onRecord(View view) { // 开始或结束录像. final TextView txt = (TextView) view; getMediaStream().subscribe(new Consumer () { @Override public void accept(MediaStream mediaStream) throws Exception { if (mediaStream.isRecording()){ // 如果正在录像,那停止. mediaStream.stopRecord(); txt.setText("录像"); }else { // 没在录像,开始录像... // 表示最大录像时长为30秒,30秒后如果没有停止,会生成一个新文件.依次类推... // 文件格式为test_uvc_0.mp4,test_uvc_1.mp4,test_uvc_2.mp4,test_uvc_3.mp4 String path = getExternalFilesDir(Environment.DIRECTORY_MOVIES) + "/test_uvc.mp4"; mediaStream.startRecord(path, 30000); final TextView pushingStateText = findViewById(R.id.pushing_state); pushingStateText.append("\n录像地址:" + path); txt.setText("停止"); } } }); } UVC摄像头还支持后台推送,即不预览的情况下进行推送,同时再切换到前台继续预览.只需要调用一个接口即可实现,如下:
@Overridepublic void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int i, int i1) { ms.setSurfaceTexture(surfaceTexture); // 设置预览的surfaceTexture}@Overridepublic boolean onSurfaceTextureDestroyed(SurfaceTexture surfaceTexture) { ms.setSurfaceTexture(null); // 设置预览窗口为null,表示关闭预览功能 return true;} 如果要彻底退出uvc摄像头的预览\推送,那只需要同时退出服务即可.
public void onQuit(View view) { // 退出 finish(); // 终止服务... Intent intent = new Intent(this, MediaStream.class); stopService(intent);} ## 获取更多信息 ##
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