最近EasyPusher针对UVC摄像头做了适配.我们结合了UVCCamera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:
<activity android:name=".UVCActivity" android:launchMode="singleInstance">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
</intent-filter>
<intent-filter>
<action android:name="android.hardware.usb.action.USB_DEVICE_DETACHED" />
</intent-filter>
<meta-data
android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
android:resource="@xml/device_filter" />
</activity>然后,的代码在UVCActivity里,这个类可以在library分支的myapplication工程里找到.即这里.
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<MediaStream>() {
@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<Object>() {
@Override
public void accept(Object o) throws Exception {
// 开启成功,进行推送.
// ...
mediaStream.startStream("cloud.easydarwin.org", "554", id);
}
}, new Consumer<Throwable>() {
@Override
public void accept(final Throwable t) throws Exception {
// ooop...开启失败,提示下...
t.printStackTrace();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(UVCActivity.this, "UVC摄像头启动失败.." + t.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
});
}
}
});
}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<MediaStream>() {
@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:
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int i, int i1) {
ms.setSurfaceTexture(surfaceTexture); // 设置预览的surfaceTexture
}
@Override
public 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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