1 package org.opencv.android;
5 import android.content.Context;
6 import android.graphics.ImageFormat;
7 import android.graphics.SurfaceTexture;
8 import android.hardware.Camera;
9 import android.hardware.Camera.CameraInfo;
10 import android.hardware.Camera.PreviewCallback;
11 import android.os.Build;
12 import android.util.AttributeSet;
13 import android.util.Log;
14 import android.view.ViewGroup.LayoutParams;
16 import org.opencv.core.CvType;
17 import org.opencv.core.Mat;
18 import org.opencv.core.Size;
19 import org.opencv.imgproc.Imgproc;
22 * This class is an implementation of the Bridge View between OpenCV and Java Camera.
23 * This class relays on the functionality available in base class and only implements
25 * connectCamera - opens Java camera and sets the PreviewCallback to be delivered.
26 * disconnectCamera - closes the camera and stops preview.
27 * When frame is delivered via callback from Camera - it processed via OpenCV to be
28 * converted to RGBA32 and then passed to the external callback for modifications if required.
30 public class JavaCameraView extends CameraBridgeViewBase implements PreviewCallback {
32 private static final int MAGIC_TEXTURE_ID = 10;
33 private static final String TAG = "JavaCameraView";
35 private byte mBuffer[];
36 private Mat[] mFrameChain;
37 private int mChainIdx = 0;
38 private Thread mThread;
39 private boolean mStopThread;
41 protected Camera mCamera;
42 protected JavaCameraFrame mCameraFrame;
43 private SurfaceTexture mSurfaceTexture;
45 public static class JavaCameraSizeAccessor implements ListItemAccessor {
47 public int getWidth(Object obj) {
48 Camera.Size size = (Camera.Size) obj;
52 public int getHeight(Object obj) {
53 Camera.Size size = (Camera.Size) obj;
58 public JavaCameraView(Context context, int cameraId) {
59 super(context, cameraId);
62 public JavaCameraView(Context context, AttributeSet attrs) {
63 super(context, attrs);
66 protected boolean initializeCamera(int width, int height) {
67 Log.d(TAG, "Initialize java camera");
68 boolean result = true;
72 if (mCameraIndex == CAMERA_ID_ANY) {
73 Log.d(TAG, "Trying to open camera with old open()");
75 mCamera = Camera.open();
78 Log.e(TAG, "Camera is not available (in use or does not exist): " + e.getLocalizedMessage());
81 if(mCamera == null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
82 boolean connected = false;
83 for (int camIdx = 0; camIdx < Camera.getNumberOfCameras(); ++camIdx) {
84 Log.d(TAG, "Trying to open camera with new open(" + Integer.valueOf(camIdx) + ")");
86 mCamera = Camera.open(camIdx);
88 } catch (RuntimeException e) {
89 Log.e(TAG, "Camera #" + camIdx + "failed to open: " + e.getLocalizedMessage());
95 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
96 int localCameraIndex = mCameraIndex;
97 if (mCameraIndex == CAMERA_ID_BACK) {
98 Log.i(TAG, "Trying to open back camera");
99 Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
100 for (int camIdx = 0; camIdx < Camera.getNumberOfCameras(); ++camIdx) {
101 Camera.getCameraInfo( camIdx, cameraInfo );
102 if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
103 localCameraIndex = camIdx;
107 } else if (mCameraIndex == CAMERA_ID_FRONT) {
108 Log.i(TAG, "Trying to open front camera");
109 Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
110 for (int camIdx = 0; camIdx < Camera.getNumberOfCameras(); ++camIdx) {
111 Camera.getCameraInfo( camIdx, cameraInfo );
112 if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
113 localCameraIndex = camIdx;
118 if (localCameraIndex == CAMERA_ID_BACK) {
119 Log.e(TAG, "Back camera not found!");
120 } else if (localCameraIndex == CAMERA_ID_FRONT) {
121 Log.e(TAG, "Front camera not found!");
123 Log.d(TAG, "Trying to open camera with new open(" + Integer.valueOf(localCameraIndex) + ")");
125 mCamera = Camera.open(localCameraIndex);
126 } catch (RuntimeException e) {
127 Log.e(TAG, "Camera #" + localCameraIndex + "failed to open: " + e.getLocalizedMessage());
136 /* Now set camera parameters */
138 Camera.Parameters params = mCamera.getParameters();
139 Log.d(TAG, "getSupportedPreviewSizes()");
140 List<android.hardware.Camera.Size> sizes = params.getSupportedPreviewSizes();
143 /* Select the size that fits surface considering maximum size allowed */
144 Size frameSize = calculateCameraFrameSize(sizes, new JavaCameraSizeAccessor(), width, height);
146 params.setPreviewFormat(ImageFormat.NV21);
147 Log.d(TAG, "Set preview size to " + Integer.valueOf((int)frameSize.width) + "x" + Integer.valueOf((int)frameSize.height));
148 params.setPreviewSize((int)frameSize.width, (int)frameSize.height);
150 List<String> FocusModes = params.getSupportedFocusModes();
151 if (FocusModes != null && FocusModes.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO))
153 params.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
156 mCamera.setParameters(params);
157 params = mCamera.getParameters();
159 mFrameWidth = params.getPreviewSize().width;
160 mFrameHeight = params.getPreviewSize().height;
162 if ((getLayoutParams().width == LayoutParams.MATCH_PARENT) && (getLayoutParams().height == LayoutParams.MATCH_PARENT))
163 mScale = Math.min(((float)height)/mFrameHeight, ((float)width)/mFrameWidth);
167 if (mFpsMeter != null) {
168 mFpsMeter.setResolution(mFrameWidth, mFrameHeight);
171 int size = mFrameWidth * mFrameHeight;
172 size = size * ImageFormat.getBitsPerPixel(params.getPreviewFormat()) / 8;
173 mBuffer = new byte[size];
175 mCamera.addCallbackBuffer(mBuffer);
176 mCamera.setPreviewCallbackWithBuffer(this);
178 mFrameChain = new Mat[2];
179 mFrameChain[0] = new Mat(mFrameHeight + (mFrameHeight/2), mFrameWidth, CvType.CV_8UC1);
180 mFrameChain[1] = new Mat(mFrameHeight + (mFrameHeight/2), mFrameWidth, CvType.CV_8UC1);
184 mCameraFrame = new JavaCameraFrame(mFrameChain[mChainIdx], mFrameWidth, mFrameHeight);
186 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
187 mSurfaceTexture = new SurfaceTexture(MAGIC_TEXTURE_ID);
188 mCamera.setPreviewTexture(mSurfaceTexture);
190 mCamera.setPreviewDisplay(null);
192 /* Finally we are ready to start the preview */
193 Log.d(TAG, "startPreview");
194 mCamera.startPreview();
198 } catch (Exception e) {
207 protected void releaseCamera() {
208 synchronized (this) {
209 if (mCamera != null) {
210 mCamera.stopPreview();
214 if (mFrameChain != null) {
215 mFrameChain[0].release();
216 mFrameChain[1].release();
218 if (mCameraFrame != null)
219 mCameraFrame.release();
224 protected boolean connectCamera(int width, int height) {
226 /* 1. We need to instantiate camera
227 * 2. We need to start thread which will be getting frames
229 /* First step - initialize camera connection */
230 Log.d(TAG, "Connecting to camera");
231 if (!initializeCamera(width, height))
234 /* now we can start update thread */
235 Log.d(TAG, "Starting processing thread");
237 mThread = new Thread(new CameraWorker());
243 protected void disconnectCamera() {
244 /* 1. We need to stop thread which updating the frames
245 * 2. Stop camera and release it
247 Log.d(TAG, "Disconnecting from camera");
250 Log.d(TAG, "Notify thread");
251 synchronized (this) {
254 Log.d(TAG, "Wating for thread");
257 } catch (InterruptedException e) {
263 /* Now release camera */
267 public void onPreviewFrame(byte[] frame, Camera arg1) {
268 Log.d(TAG, "Preview Frame received. Frame size: " + frame.length);
269 synchronized (this) {
270 mFrameChain[1 - mChainIdx].put(0, 0, frame);
274 mCamera.addCallbackBuffer(mBuffer);
277 private class JavaCameraFrame implements CvCameraViewFrame {
279 return mYuvFrameData.submat(0, mHeight, 0, mWidth);
283 Imgproc.cvtColor(mYuvFrameData, mRgba, Imgproc.COLOR_YUV2BGR_NV12, 4);
287 public JavaCameraFrame(Mat Yuv420sp, int width, int height) {
291 mYuvFrameData = Yuv420sp;
295 public void release() {
299 private Mat mYuvFrameData;
305 private class CameraWorker implements Runnable {
309 synchronized (JavaCameraView.this) {
311 JavaCameraView.this.wait();
312 } catch (InterruptedException e) {
313 // TODO Auto-generated catch block
319 if (!mFrameChain[mChainIdx].empty())
320 deliverAndDrawFrame(mCameraFrame);
321 mChainIdx = 1 - mChainIdx;
323 } while (!mStopThread);
324 Log.d(TAG, "Finish processing thread");