| Fields Summary |
|---|
| private static final String | TAG |
| private android.view.TextureView | mPreviewView |
| private android.graphics.SurfaceTexture | mPreviewTexture |
| private int | mPreviewTexWidth |
| private int | mPreviewTexHeight |
| private android.widget.Spinner | mCameraSpinner |
| private android.widget.Spinner | mResolutionSpinner |
| private int | mCurrentCameraId |
| private android.hardware.Camera | mCamera |
| private List | mPreviewSizes |
| private Camera.Size | mNextPreviewSize |
| private Camera.Size | mPreviewSize |
| private android.view.TextureView | mOutputView |
| private static final int | STATE_OFF |
| private static final int | STATE_PREVIEW |
| private static final int | STATE_NO_CALLBACKS |
| private int | mState |
| private boolean | mProcessInProgress |
| private boolean | mProcessingFirstFrame |
| private RenderScript | mRS |
| private RsYuv | mFilterYuv |
| private AdapterView.OnItemSelectedListener | mCameraSpinnerListener |
| private AdapterView.OnItemSelectedListener | mResolutionSelectedListener |
| private long[] | mTiming |
| private int | mTimingSlot |
| Methods Summary |
|---|
| public void | onCreate(android.os.Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.cf_main);
mPreviewView = (TextureView) findViewById(R.id.preview_view);
mOutputView = (TextureView) findViewById(R.id.format_view);
mPreviewView.setSurfaceTextureListener(this);
int numCameras = Camera.getNumberOfCameras();
String[] cameraNames = new String[numCameras];
for (int i = 0; i < numCameras; i++) {
cameraNames[i] = "Camera " + i;
}
mCameraSpinner = (Spinner) findViewById(R.id.cameras_selection);
mCameraSpinner.setAdapter(
new ArrayAdapter<String>(
this, R.layout.cf_format_list_item, cameraNames));
mCameraSpinner.setOnItemSelectedListener(mCameraSpinnerListener);
mResolutionSpinner = (Spinner) findViewById(R.id.resolution_selection);
mResolutionSpinner.setOnItemSelectedListener(mResolutionSelectedListener);
mRS = RenderScript.create(this);
mFilterYuv = new RsYuv(mRS);
mOutputView.setSurfaceTextureListener(mFilterYuv);
|
| public void | onPause()
super.onPause();
shutdownCamera();
|
| public void | onPreviewFrame(byte[] data, android.hardware.Camera camera)
if (mProcessInProgress || mState != STATE_PREVIEW) {
mCamera.addCallbackBuffer(data);
return;
}
if (data == null) {
return;
}
int expectedBytes = mPreviewSize.width * mPreviewSize.height *
ImageFormat.getBitsPerPixel(ImageFormat.NV21) / 8;
if (expectedBytes != data.length) {
Log.e(TAG, "Mismatched size of buffer! Expected ");
mState = STATE_NO_CALLBACKS;
mCamera.setPreviewCallbackWithBuffer(null);
return;
}
mProcessInProgress = true;
if ((mFilterYuv == null) ||
(mPreviewSize.width != mFilterYuv.getWidth()) ||
(mPreviewSize.height != mFilterYuv.getHeight()) ) {
mFilterYuv.reset(mPreviewSize.width, mPreviewSize.height);
}
mProcessInProgress = true;
new ProcessPreviewDataTask().execute(data);
|
| public void | onResume()
super.onResume();
setUpCamera(mCameraSpinner.getSelectedItemPosition());
|
| public void | onSurfaceTextureAvailable(android.graphics.SurfaceTexture surface, int width, int height)
mPreviewTexture = surface;
mPreviewTexWidth = width;
mPreviewTexHeight = height;
if (mCamera != null) {
startPreview();
}
|
| public boolean | onSurfaceTextureDestroyed(android.graphics.SurfaceTexture surface)
return true;
|
| public void | onSurfaceTextureSizeChanged(android.graphics.SurfaceTexture surface, int width, int height)
// Ignored, Camera does all the work for us
|
| public void | onSurfaceTextureUpdated(android.graphics.SurfaceTexture surface)
// Invoked every time there's a new Camera preview frame
|
| private void | setUpCamera(int id)
shutdownCamera();
mCurrentCameraId = id;
mCamera = Camera.open(id);
Camera.Parameters p = mCamera.getParameters();
// Get preview resolutions
List<Camera.Size> unsortedSizes = p.getSupportedPreviewSizes();
class SizeCompare implements Comparator<Camera.Size> {
public int compare(Camera.Size lhs, Camera.Size rhs) {
if (lhs.width < rhs.width) return -1;
if (lhs.width > rhs.width) return 1;
if (lhs.height < rhs.height) return -1;
if (lhs.height > rhs.height) return 1;
return 0;
}
};
SizeCompare s = new SizeCompare();
TreeSet<Camera.Size> sortedResolutions = new TreeSet<Camera.Size>(s);
sortedResolutions.addAll(unsortedSizes);
mPreviewSizes = new ArrayList<Camera.Size>(sortedResolutions);
String[] availableSizeNames = new String[mPreviewSizes.size()];
for (int i = 0; i < mPreviewSizes.size(); i++) {
availableSizeNames[i] =
Integer.toString(mPreviewSizes.get(i).width) + " x " +
Integer.toString(mPreviewSizes.get(i).height);
}
mResolutionSpinner.setAdapter(
new ArrayAdapter<String>(
this, R.layout.cf_format_list_item, availableSizeNames));
// Set initial values
//
int initialSize = mPreviewSizes.size() - 1;
mNextPreviewSize = mPreviewSizes.get(initialSize);
mResolutionSpinner.setSelection(initialSize);
if(mPreviewTexture != null)
{
startPreview();
}
|
| private void | shutdownCamera()
if (mCamera != null) {
mCamera.setPreviewCallbackWithBuffer(null);
mCamera.stopPreview();
mCamera.release();
mCamera = null;
mState = STATE_OFF;
}
|
| private void | startPreview()
if (mState != STATE_OFF) {
// Stop for a while to drain callbacks
mCamera.setPreviewCallbackWithBuffer(null);
mCamera.stopPreview();
mState = STATE_OFF;
Handler h = new Handler();
Runnable mDelayedPreview = new Runnable() {
public void run() {
startPreview();
}
};
h.postDelayed(mDelayedPreview, 300);
return;
}
mState = STATE_PREVIEW;
Matrix transform = new Matrix();
float widthRatio = mNextPreviewSize.width / (float)mPreviewTexWidth;
float heightRatio = mNextPreviewSize.height / (float)mPreviewTexHeight;
transform.setScale(1, heightRatio/widthRatio);
transform.postTranslate(0,
mPreviewTexHeight * (1 - heightRatio/widthRatio)/2);
mPreviewView.setTransform(transform);
mOutputView.setTransform(transform);
mPreviewSize = mNextPreviewSize;
Camera.Parameters p = mCamera.getParameters();
p.setPreviewFormat(ImageFormat.NV21);
p.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
mCamera.setParameters(p);
mCamera.setPreviewCallbackWithBuffer(this);
int expectedBytes = mPreviewSize.width * mPreviewSize.height *
ImageFormat.getBitsPerPixel(ImageFormat.NV21) / 8;
for (int i=0; i < 4; i++) {
mCamera.addCallbackBuffer(new byte[expectedBytes]);
}
//mFormatView.setColorFilter(mYuv2RgbFilter);
mProcessingFirstFrame = true;
try {
mCamera.setPreviewTexture(mPreviewTexture);
mCamera.startPreview();
} catch (IOException ioe) {
// Something bad happened
Log.e(TAG, "Unable to start up preview");
}
|
