Android Camera Set setBestPreviewFPS(Camera.Parameters parameters, int minFPS, int maxFPS)

Description

set Best Preview FPS

License

Apache License

Declaration

public static void setBestPreviewFPS(Camera.Parameters parameters,
            int minFPS, int maxFPS) 

Method Source Code

//package com.java2s;
/*//w w w . java2  s.  c o m
 * Copyright (C) 2014 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import android.hardware.Camera;

import android.util.Log;

import java.util.Arrays;
import java.util.Collection;

import java.util.Iterator;
import java.util.List;

public class Main {
    private static final String TAG = "CameraConfiguration";
    private static final int MIN_FPS = 10;
    private static final int MAX_FPS = 20;

    public static void setBestPreviewFPS(Camera.Parameters parameters) {
        setBestPreviewFPS(parameters, MIN_FPS, MAX_FPS);
    }

    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]);
                }
            }
        }
    }

    private static String toString(Collection<int[]> arrays) {
        if (arrays == null || arrays.isEmpty()) {
            return "[]";
        }
        StringBuilder buffer = new StringBuilder();
        buffer.append('[');
        Iterator<int[]> it = arrays.iterator();
        while (it.hasNext()) {
            buffer.append(Arrays.toString(it.next()));
            if (it.hasNext()) {
                buffer.append(", ");
            }
        }
        buffer.append(']');
        return buffer.toString();
    }

    private static String toString(Iterable<Camera.Area> areas) {
        if (areas == null) {
            return null;
        }
        StringBuilder result = new StringBuilder();
        for (Camera.Area area : areas) {
            result.append(area.rect).append(':').append(area.weight)
                    .append(' ');
        }
        return result.toString();
    }
}

Related

1. setBarcodeSceneMode(Camera.Parameters parameters)
2. setBestExposure(Camera.Parameters parameters, boolean lightOn)
3. setBestPreviewFPS(Camera.Parameters parameters)
4. setCameraDisplayOrientation(Context mContext, int cameraId, Camera camera)
5. setFocus(Camera.Parameters parameters, boolean autoFocus, boolean disableContinuous, boolean safeMode)
6. setFocusArea(Camera.Parameters parameters)
7. setInvertColor(Camera.Parameters parameters)