public static void setBestPreviewFPS(Camera.Parameters parameters, int minFPS, int maxFPS) {
List<int[]> supportedPreviewFpsRanges = parameters.getSupportedPreviewFpsRange();
Log.i(TAG, "Supported FPS ranges: " + toString(supportedPreviewFpsRanges));
if (supportedPreviewFpsRanges != null && !supportedPreviewFpsRanges.isEmpty()) {
int[] suitableFPSRange = null;
for (int[] fpsRange : supportedPreviewFpsRanges) {
int thisMin = fpsRange[Camera.Parameters.PREVIEW_FPS_MIN_INDEX];
int thisMax = fpsRange[Camera.Parameters.PREVIEW_FPS_MAX_INDEX];
if (thisMin >= minFPS * 1000 && thisMax <= maxFPS * 1000) {
suitableFPSRange = fpsRange;
break;
}
}
if (suitableFPSRange == null) {
Log.i(TAG, "No suitable FPS range?");
} else {
int[] currentFpsRange = new int[2];
parameters.getPreviewFpsRange(currentFpsRange);
if (Arrays.equals(currentFpsRange, suitableFPSRange)) {
Log.i(TAG, "FPS range already set to " + Arrays.toString(suitableFPSRange));
} else {
Log.i(TAG, "Setting FPS range to " + Arrays.toString(suitableFPSRange));
parameters.setPreviewFpsRange(
suitableFPSRange[Camera.Parameters.PREVIEW_FPS_MIN_INDEX],
suitableFPSRange[Camera.Parameters.PREVIEW_FPS_MAX_INDEX]);
}
}
}
}
/**
* Opens a camera, and attempts to establish preview mode at the specified width and height.
*
* <p>Sets mCameraPreviewWidth and mCameraPreviewHeight to the actual width/height of the preview.
*/
private void openCamera(int desiredWidth, int desiredHeight) {
if (mCamera != null) {
throw new RuntimeException("camera already initialized");
}
Camera.CameraInfo info = new Camera.CameraInfo();
// Try to find a back-facing camera (e.g. for videoconferencing).
int numCameras = Camera.getNumberOfCameras();
for (int i = 0; i < numCameras; i++) {
Camera.getCameraInfo(i, info);
// if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) { //TODO: front
// facing
if (info.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
mCamera = Camera.open(i);
break;
}
}
if (mCamera == null) {
Log.d(TAG, "No front-facing camera found; opening default");
mCamera = Camera.open(); // opens first back-facing camera
}
if (mCamera == null) {
throw new RuntimeException("Unable to open camera");
}
mCamera.setDisplayOrientation(90); // TODO: set according to front or back facing
Camera.Parameters parms = mCamera.getParameters();
// parms.setRotation(180);
CameraUtils.choosePreviewSize(parms, desiredWidth, desiredHeight);
// Give the camera a hint that we're recording video. This can have a big
// impact on frame rate.
parms.setRecordingHint(true);
// leave the frame rate set to default
mCamera.setParameters(parms);
int[] fpsRange = new int[2];
Camera.Size mCameraPreviewSize = parms.getPreviewSize();
parms.getPreviewFpsRange(fpsRange);
String previewFacts = mCameraPreviewSize.width + "x" + mCameraPreviewSize.height;
if (fpsRange[0] == fpsRange[1]) {
previewFacts += " @" + (fpsRange[0] / 1000.0) + "fps";
} else {
previewFacts += " @[" + (fpsRange[0] / 1000.0) + " - " + (fpsRange[1] / 1000.0) + "] fps";
}
TextView text = (TextView) findViewById(R.id.cameraParams_text);
text.setText(previewFacts);
mCameraPreviewWidth = mCameraPreviewSize.width;
mCameraPreviewHeight = mCameraPreviewSize.height;
}
/**
* Opens a camera, and attempts to establish preview mode at the specified width and height.
*
* <p>Sets mCameraPreviewWidth and mCameraPreviewHeight to the actual width/height of the preview.
*/
private void openCamera(int desiredWidth, int desiredHeight) {
if (mCamera != null) {
throw new RuntimeException("camera already initialized");
}
Camera.CameraInfo info = new Camera.CameraInfo();
// Try to find a front-facing camera (e.g. for videoconferencing).
int numCameras = Camera.getNumberOfCameras();
for (int i = 0; i < numCameras; i++) {
Camera.getCameraInfo(i, info);
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
mCamera = Camera.open(i);
break;
}
}
if (mCamera == null) {
Log.d(TAG, "No front-facing camera found; opening default");
mCamera = Camera.open(); // opens first back-facing camera
}
if (mCamera == null) {
throw new RuntimeException("Unable to open camera");
}
Camera.Parameters parms = mCamera.getParameters();
choosePreviewSize(parms, desiredWidth, desiredHeight);
// leave the frame rate set to default
mCamera.setParameters(parms);
int[] fpsRange = new int[2];
Camera.Size mCameraPreviewSize = parms.getPreviewSize();
parms.getPreviewFpsRange(fpsRange);
String previewFacts = mCameraPreviewSize.width + "x" + mCameraPreviewSize.height;
if (fpsRange[0] == fpsRange[1]) {
previewFacts += " @" + (fpsRange[0] / 1000.0) + "fps";
} else {
previewFacts += " @[" + (fpsRange[0] / 1000.0) + " - " + (fpsRange[1] / 1000.0) + "] fps";
}
TextView text = (TextView) findViewById(R.id.cameraParams_text);
text.setText(previewFacts);
mCameraPreviewWidth = mCameraPreviewSize.width;
mCameraPreviewHeight = mCameraPreviewSize.height;
}