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Issue #38 : Add minimum FPS to be safe

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This commit is contained in:
Sean Owen 2014-01-24 09:37:34 +00:00
parent de6e9dbc52
commit 28f2a301c2
1 changed files with 29 additions and 11 deletions
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40
android/src/com/google/zxing/client/android/camera/CameraConfigurationManager.java
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@ -50,6 +50,7 @@ final class CameraConfigurationManager {
//private static final float MAX_EXPOSURE_COMPENSATION = 1.5f;
//private static final float MIN_EXPOSURE_COMPENSATION = 0.0f;
private static final double MAX_ASPECT_DISTORTION = 0.15;
private static final int MIN_FPS = 5;
private final Context context;
private Point screenResolution;
@ -91,17 +92,8 @@ final class CameraConfigurationManager {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
initializeTorch(parameters, prefs, safeMode);
// Required for Glass compatibility; also improves battery/CPU performance a tad
List<int[]> supportedPreviewFpsRanges = parameters.getSupportedPreviewFpsRange();
if (supportedPreviewFpsRanges != null && !supportedPreviewFpsRanges.isEmpty()) {
int[] currentFpsRange = new int[2];
parameters.getPreviewFpsRange(currentFpsRange);
int[] minimumPreviewFpsRange = supportedPreviewFpsRanges.get(0);
if (!Arrays.equals(currentFpsRange, minimumPreviewFpsRange)) {
parameters.setPreviewFpsRange(minimumPreviewFpsRange[0], minimumPreviewFpsRange[1]);
}
}
setBestPreviewFPS(parameters);
String focusMode = null;
if (prefs.getBoolean(PreferencesActivity.KEY_AUTO_FOCUS, true)) {
@ -218,6 +210,32 @@ final class CameraConfigurationManager {
*/
}
private static void setBestPreviewFPS(Camera.Parameters parameters) {
// Required for Glass compatibility; also improves battery/CPU performance a tad
List<int[]> supportedPreviewFpsRanges = parameters.getSupportedPreviewFpsRange();
Log.i(TAG, "Supported FPS ranges: " + supportedPreviewFpsRanges);
if (supportedPreviewFpsRanges != null && !supportedPreviewFpsRanges.isEmpty()) {
int[] minimumSuitableFpsRange = null;
for (int[] fpsRange : supportedPreviewFpsRanges) {
if (fpsRange[Camera.Parameters.PREVIEW_FPS_MAX_INDEX] >= MIN_FPS * 1000) {
minimumSuitableFpsRange = fpsRange;
break;
}
}
if (minimumSuitableFpsRange == null) {
Log.i(TAG, "No suitable FPS range?");
} else {
int[] currentFpsRange = new int[2];
parameters.getPreviewFpsRange(currentFpsRange);
if (!Arrays.equals(currentFpsRange, minimumSuitableFpsRange)) {
Log.i(TAG, "Setting FPS range to " + Arrays.toString(minimumSuitableFpsRange));
parameters.setPreviewFpsRange(minimumSuitableFpsRange[Camera.Parameters.PREVIEW_FPS_MIN_INDEX],
minimumSuitableFpsRange[Camera.Parameters.PREVIEW_FPS_MAX_INDEX]);
}
}
}
}
private Point findBestPreviewSizeValue(Camera.Parameters parameters, Point screenResolution) {
List<Camera.Size> rawSupportedSizes = parameters.getSupportedPreviewSizes();