Android String Decode decodeYUV420SPQuarterRes(int[] rgb, byte[] yuv420sp, int width, int height)

Description

decode YUVSP Quarter Res

License

Apache License

Declaration

public static void decodeYUV420SPQuarterRes(int[] rgb, byte[] yuv420sp,
            int width, int height) 

Method Source Code

//package com.java2s;
/*// ww w.  j a  v a  2  s. c o m
 * Copyright (C) 2011 The Android Open Source Project
 *
 * 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.
 */

public class Main {
    public static void decodeYUV420SPQuarterRes(int[] rgb, byte[] yuv420sp,
            int width, int height) {
        final int frameSize = width * height;

        for (int j = 0, ypd = 0; j < height; j += 4) {
            int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;
            for (int i = 0; i < width; i += 4, ypd++) {
                int y = (0xff & (yuv420sp[j * width + i])) - 16;
                if (y < 0) {
                    y = 0;
                }
                if ((i & 1) == 0) {
                    v = (0xff & yuv420sp[uvp++]) - 128;
                    u = (0xff & yuv420sp[uvp++]) - 128;
                    uvp += 2; // Skip the UV values for the 4 pixels skipped in between
                }
                int y1192 = 1192 * y;
                int r = (y1192 + 1634 * v);
                int g = (y1192 - 833 * v - 400 * u);
                int b = (y1192 + 2066 * u);

                if (r < 0) {
                    r = 0;
                } else if (r > 262143) {
                    r = 262143;
                }
                if (g < 0) {
                    g = 0;
                } else if (g > 262143) {
                    g = 262143;
                }
                if (b < 0) {
                    b = 0;
                } else if (b > 262143) {
                    b = 262143;
                }

                rgb[ypd] = 0xff000000 | ((r << 6) & 0xff0000)
                        | ((g >> 2) & 0xff00) | ((b >> 10) & 0xff);
            }
        }
    }
}

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