set Best Preview FPS for Camera Parameters - Android android.os

Android examples for android.os:Parcel

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Description

set Best Preview FPS for Camera Parameters

Demo Code

/*//w  ww  . jav  a2s . c  om
 * 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.
 */
//package com.java2s;
import java.util.Arrays;
import java.util.Collection;

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

import android.annotation.SuppressLint;
import android.annotation.TargetApi;

import android.hardware.Camera;
import android.os.Build;
import android.util.Log;

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);
    }

    @SuppressLint("NewApi")
    @SuppressWarnings("deprecation")
    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();
    }

    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1)
    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();
    }
}

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