Android Camera2 API 裁剪视频
Android Camera2 API Cropping Video
我正在尝试使用 Android Camera2 API 录制视频。我正在尝试通过在请求生成器中设置 SCALER_CROP_REGION
将视频裁剪为正方形。我正在使用以下代码,但它似乎不起作用
mCameraDevice.createCaptureSession(surfaces, new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured( CameraCaptureSession cameraCaptureSession) {
mCaptureSession = cameraCaptureSession;
try {
mIsRecording = true;
/////****** this where i'm setting the coping
mZoom = getZoomRect();
mPreviewRequestBuilder.set(CaptureRequest.SCALER_CROP_REGION, mZoom);
/////////******************
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
HandlerThread thread = new HandlerThread("CameraPreview");
thread.start();
mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(), null, mBackgroundHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void onConfigureFailed( CameraCaptureSession cameraCaptureSession) {
Log.d(TAG, "onConfigureFailed");
}}, mBackgroundHandler);
这是应该让区域裁剪的代码
public int zoom_level = 1;
public Rect mZoom = null;
public Rect getZoomRect(){
try {
CameraManager manager = (CameraManager) getApplicationContext().getSystemService(Context.CAMERA_SERVICE);
CameraCharacteristics characteristics = manager.getCameraCharacteristics(mCameraId);
float maxzoom = (characteristics.get(CameraCharacteristics.SCALER_AVAILABLE_MAX_DIGITAL_ZOOM))*10;
Rect m = characteristics.get(CameraCharacteristics.SENSOR_INFO_ACTIVE_ARRAY_SIZE);
int minW = (int) (m.width() / maxzoom);
int minH = (int) (m.height() / maxzoom);
int difW = m.width() - minW;
int difH = m.height() - minH;
int cropW = difW /100 *(int)zoom_level;
int cropH = difH /100 *(int)zoom_level;
cropW -= cropW & 3;
cropH -= cropH & 3;
mZoom = new Rect(cropW, cropH, m.width() - cropW, m.height() - cropH);
///// if recording video make it square
if (mIsRecording) {
mZoom = new Rect(cropW, cropH, m.width() - cropW, m.width() - cropW);
}
} catch (CameraAccessException e) {
Log.e(TAG, "can not access camera",e);
throw new RuntimeException("can not access camera.", e);
} catch (NullPointerException ex) {
Log.e(TAG, "touch logic",ex);
}
return mZoom;
}
假设 zoom_level=1,而 SCALER_AVAILABLE_MAX_DIGITAL_ZOOM 是 4,那么你最终得到
minW = m.width/40
minH = m.height/40
difW = m.width*39/40
difH = m.height*39/40
cropW = m.width*39/40/100 * 1
cropH = m.height*39/40/100 * 1
(floor cropW/cropH down to nearest multiple of 4)
如果m.width = 3000,m.width=2000,则cropW = 28,cropPH = 16。
所以用于录制的 mZoom 是
Rect(28, 16, 2972, 2972).
不居中,许多设备只支持居中缩放。但至少是一个正方形区域。
真正的问题是您无法通过裁剪更改输出的纵横比 - 当您创建捕获会话时,纵横比由输出表面的分辨率固定。有关裁剪的工作原理,请参阅 these diagrams。
我正在尝试使用 Android Camera2 API 录制视频。我正在尝试通过在请求生成器中设置 SCALER_CROP_REGION
将视频裁剪为正方形。我正在使用以下代码,但它似乎不起作用
mCameraDevice.createCaptureSession(surfaces, new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured( CameraCaptureSession cameraCaptureSession) {
mCaptureSession = cameraCaptureSession;
try {
mIsRecording = true;
/////****** this where i'm setting the coping
mZoom = getZoomRect();
mPreviewRequestBuilder.set(CaptureRequest.SCALER_CROP_REGION, mZoom);
/////////******************
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
HandlerThread thread = new HandlerThread("CameraPreview");
thread.start();
mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(), null, mBackgroundHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void onConfigureFailed( CameraCaptureSession cameraCaptureSession) {
Log.d(TAG, "onConfigureFailed");
}}, mBackgroundHandler);
这是应该让区域裁剪的代码
public int zoom_level = 1;
public Rect mZoom = null;
public Rect getZoomRect(){
try {
CameraManager manager = (CameraManager) getApplicationContext().getSystemService(Context.CAMERA_SERVICE);
CameraCharacteristics characteristics = manager.getCameraCharacteristics(mCameraId);
float maxzoom = (characteristics.get(CameraCharacteristics.SCALER_AVAILABLE_MAX_DIGITAL_ZOOM))*10;
Rect m = characteristics.get(CameraCharacteristics.SENSOR_INFO_ACTIVE_ARRAY_SIZE);
int minW = (int) (m.width() / maxzoom);
int minH = (int) (m.height() / maxzoom);
int difW = m.width() - minW;
int difH = m.height() - minH;
int cropW = difW /100 *(int)zoom_level;
int cropH = difH /100 *(int)zoom_level;
cropW -= cropW & 3;
cropH -= cropH & 3;
mZoom = new Rect(cropW, cropH, m.width() - cropW, m.height() - cropH);
///// if recording video make it square
if (mIsRecording) {
mZoom = new Rect(cropW, cropH, m.width() - cropW, m.width() - cropW);
}
} catch (CameraAccessException e) {
Log.e(TAG, "can not access camera",e);
throw new RuntimeException("can not access camera.", e);
} catch (NullPointerException ex) {
Log.e(TAG, "touch logic",ex);
}
return mZoom;
}
假设 zoom_level=1,而 SCALER_AVAILABLE_MAX_DIGITAL_ZOOM 是 4,那么你最终得到
minW = m.width/40
minH = m.height/40
difW = m.width*39/40
difH = m.height*39/40
cropW = m.width*39/40/100 * 1
cropH = m.height*39/40/100 * 1
(floor cropW/cropH down to nearest multiple of 4)
如果m.width = 3000,m.width=2000,则cropW = 28,cropPH = 16。
所以用于录制的 mZoom 是
Rect(28, 16, 2972, 2972).
不居中,许多设备只支持居中缩放。但至少是一个正方形区域。
真正的问题是您无法通过裁剪更改输出的纵横比 - 当您创建捕获会话时,纵横比由输出表面的分辨率固定。有关裁剪的工作原理,请参阅 these diagrams。