QrUtils.java 文件源码

/**
 * YUV420sp
 *
 * @param inputWidth
 * @param inputHeight
 * @param scaled
 * @return
 */
public static byte[] getYUV420sp(int inputWidth, int inputHeight, Bitmap scaled) {
    int[] argb = new int[inputWidth * inputHeight];

    scaled.getPixels(argb, 0, inputWidth, 0, 0, inputWidth, inputHeight);

    /**
     * 需要转换成偶数的像素点，否则编码YUV420的时候有可能导致分配的空间大小不够而溢出。
     */
    int requiredWidth = inputWidth % 2 == 0 ? inputWidth : inputWidth + 1;
    int requiredHeight = inputHeight % 2 == 0 ? inputHeight : inputHeight + 1;

    int byteLength = requiredWidth * requiredHeight * 3 / 2;
    if (yuvs == null || yuvs.length < byteLength) {
        yuvs = new byte[byteLength];
    } else {
        Arrays.fill(yuvs, (byte) 0);
    }

    encodeYUV420SP(yuvs, argb, inputWidth, inputHeight);

    scaled.recycle();

    return yuvs;
}