我正在使用MediaRecorderAPI录制视频片段，并且我正在使用已弃用的Camera API。代码如下所示：
var menuLinks = document.querySelectorAll('.link');
for (i=0; i<menuLinks.length; i++) {
menuLinks[i].addEventListener('click', function(){
toggleClass(theToggle, 'on');
});
}
这适用于大多数设备。但是，还有一些其他@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private boolean prepareVideoRecorder() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
CameraManager manager = (CameraManager) getActivity().getSystemService(Context.CAMERA_SERVICE);
try {
CameraCharacteristics characteristics = manager.getCameraCharacteristics("" + currentCameraId);
mSensorOrientation = characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
mMediaRecorder = new MediaRecorder();
mCamera.unlock();
mMediaRecorder.setCamera(mCamera);
mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && mSensorOrientation != null) {
int rotation = getActivity().getWindowManager().getDefaultDisplay().getRotation();
switch (mSensorOrientation) {
case SENSOR_ORIENTATION_DEFAULT_DEGREES:
mMediaRecorder.setOrientationHint(DEFAULT_ORIENTATIONS.get(rotation));
break;
case SENSOR_ORIENTATION_INVERSE_DEGREES:
mMediaRecorder.setOrientationHint(INVERSE_ORIENTATIONS.get(rotation));
break;
}
} else {
if (currentCameraId == 0) {
mMediaRecorder.setOrientationHint(90);
} else {
mMediaRecorder.setOrientationHint(270);
}
}
mMediaRecorder.setMaxDuration(MAX_DURATION_VIDEO);
mMediaRecorder.setProfile(CamcorderProfile.get(currentCameraId, CamcorderProfile.QUALITY_HIGH));
mMediaRecorder.setVideoSize(1280, 720);
outputFile = VideoUtils.getOutputMediaFile(Constant.MEDIA_TYPE_VIDEO);
mFileObserver = new MyFileObserver(outputFile.toString(), FileObserver.ALL_EVENTS);
mMediaRecorder.setOutputFile(outputFile.toString());
mListUri.add(VideoUtils.getOutputMediaFileUri(Constant.MEDIA_TYPE_VIDEO));
mMediaRecorder.setVideoFrameRate(30);
mMediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface());
try {
mMediaRecorder.prepare();
} catch (IllegalStateException e) {
Log.d(TAG,
"IllegalStateException preparing MediaRecorder: "
+ e.getMessage());
releaseMediaRecorder();
return false;
} catch (IOException e) {
Log.d(TAG, "IOException preparing MediaRecorder: " + e.getMessage());
releaseMediaRecorder();
return false;
}
return true;
}
会偶尔抛出mCamera.unlock()。
我挖掘了源代码并看到了这个：
RuntimeException: unlock failed我认为是在调用static void android_hardware_Camera_unlock(JNIEnv *env, jobject thiz)
{
ALOGV("unlock");
sp<Camera> camera = get_native_camera(env, thiz, NULL);
if (camera == 0) return;
if (camera->unlock() != NO_ERROR) {
jniThrowRuntimeException(env, "unlock failed");
}
}
时执行的代码。
我的问题是，如果这是解锁相机的代码，那么可能导致mCamera.unlock()返回camera->unlock()以外的内容的原因是什么？