監聽
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 攝像頭鏈接成功
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 攝像頭斷開鏈接
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());
}
});123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657
這個類主要實現UVC攝像頭的監聽\鏈接\銷毀\反監聽.當有UVC攝像頭鏈接成功後,會創建壹個mUVCCamera對象.
然後在MediaStream裏, 我們改造了switchCamera,當參數傳2時,表示要切換到UVCCamera(0,1分別表示切換到後置\前置攝像頭).
創建
在創建攝像頭時,如果是要創建uvc攝像頭,那直接從服務裏面獲取之前創建的mUVCCamera實例:
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;
}123456789101112131415
預覽
在預覽時,如果uvc攝像頭已經創建了,那執行uvc攝像頭的預覽操作:
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;
}
}1234567891011121314
這裏我們選的colorFormat為PIXEL_FORMAT_YUV420SP 相當於標準攝像頭的NV21格式.
關閉預覽
同理,關閉時,調用的是uvc攝像頭的關閉.
UVCCamera value = uvcCamera; if (value != null) {
value.stopPreview();
}1234
銷毀
因為我們這裏並沒有實質性的創建,所以銷毀時也僅將實例置為null就可以了.
UVCCamera value = uvcCamera;if (value != null) { // value.destroy();
uvcCamera = null;
}12345
有了這些操作,我們看看上層怎麽調用,
首先需要在Manifest裏面增加若幹代碼,具體詳見UVCCamera工程說明.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>1234567891011121314151617181920
然後,的代碼在UVCActivity裏,這個類可以在library分支的myapplication工程裏找到.即這裏.
啟動或者停止UVC攝像頭推送:
public void onPush(View view) { // 異步獲取到MediaStream對象.
getMediaStream().subscribe(new Consumer<MediaStream>() { @Override
public void accept(final MediaStream mediaStream) throws Exception { // 判斷當前的推送狀態.
MediaStream.PushingState state = mediaStream.getPushingState(); if (state != null && state.state > 0) { // 當前正在推送,那終止推送和預覽
mediaStream.stopStream();
mediaStream.closeCameraPreview();
}else{ // switch 0表示後置,1表示前置,2表示UVC攝像頭
// 異步開啟UVC攝像頭
RxHelper.single(mediaStream.switchCamera(2), null).subscribe(new Consumer<Object>() { @Override
public void accept(Object o) throws Exception { // 開啟成功,進行推送.
// ...
mediaStream.startStream("cloud.easydarwin.org", "554", id);
}
}, new Consumer<Throwable>() { @Override
public void accept(final Throwable t) throws Exception { // ooop...開啟失敗,提示下...
t.printStackTrace();
runOnUiThread(new Runnable() { @Override
public void run() {
Toast.makeText(UVCActivity.this, "UVC攝像頭啟動失敗.." + t.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
});
}
}
});
}12345678910111213141516171819202122232425262728293031323334353637
這樣,整個推送就完成了.如果壹切順利,應當能在VLC播放出來UVC攝像頭的視頻了~~
我們再看看如何錄像.也非常簡單…
public void onRecord(View view) { // 開始或結束錄像.
final TextView txt = (TextView) view;
getMediaStream().subscribe(new Consumer<MediaStream>() { @Override
public void accept(MediaStream mediaStream) throws Exception { if (mediaStream.isRecording()){ // 如果正在錄像,那停止.
mediaStream.stopRecord();
txt.setText("錄像");
}else { // 沒在錄像,開始錄像...
// 表示最大錄像時長為30秒,30秒後如果沒有停止,會生成壹個新文件.依次類推...
// 文件格式為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錄像地址:" + path);
txt.setText("停止");
}
}
});
}123456789101112131415161718192021
UVC攝像頭還支持後臺推送,即不預覽的情況下進行推送,同時再切換到前臺繼續預覽.只需要調用壹個接口即可實現,如下:
@Overridepublic void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int i, int i1) {
ms.setSurfaceTexture(surfaceTexture); // 設置預覽的surfaceTexture}@Overridepublic boolean onSurfaceTextureDestroyed(SurfaceTexture surfaceTexture) {
ms.setSurfaceTexture(null); // 設置預覽窗口為null,表示關閉預覽功能
return true;
}123456789
如果要徹底退出uvc攝像頭的預覽\推送,那只需要同時退出服務即可.
public void onQuit(View view) { // 退出
finish(); // 終止服務...
Intent intent = new Intent(this, MediaStream.class);
stopService(intent);
}1234567
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