정리사항 33 - (적용)NV21 to RGB -> intArray to byteArray -> BGR / byteArray to intArray

*NV21 to RGB

http://www.41post.com/3470/programming/android-retrieving-the-camera-preview-as-a-pixel-array

Android: Retrieving Camera preview as a Pixel Array | 41 Post

 

*intArray to byteArray

https://stackoverflow.com/questions/1086054/how-to-convert-int-to-byte

How to convert int[] to byte[]

 

 

*RGB to BGR

http://www.java2s.com/example/java-utility-method/rgb-color-convert-to/rgbtobgr-final-byte-pixels-12e3d.html

Java RGB Color Convert To rgbToBgr(final byte[] pixels)

 

 

//nv21 -> RGB
    byte[] decodeYUV420SP(int[] rgb, byte[] yuv420sp, int width, int height) {

        final int frameSize = width * height;

        for (int j = 0, yp = 0; j < height; j++) {
            int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;
            for (int i = 0; i < width; i++, yp++) {
                int y = (0xff & ((int) yuv420sp[yp])) - 16;
                if (y < 0)
                    y = 0;
                if ((i & 1) == 0) {
                    v = (0xff & yuv420sp[uvp++]) - 128;
                    u = (0xff & yuv420sp[uvp++]) - 128;
                }

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

        //int[] to byte[]
        ByteBuffer byteBuffer = ByteBuffer.allocate(rgb.length * 4);
        IntBuffer intBuffer = byteBuffer.asIntBuffer();
        intBuffer.put(rgb);
        byte[] array = byteBuffer.array();

        return rgbToBgr(array);
    }

    //RGB -> BGR
    public static byte[] rgbToBgr(final byte[] pixels) {
        final byte[] pixels_publish = new byte[pixels.length];
        int idx = 0;
        for (int i = 0; i < pixels.length / 3; i++) {
            pixels_publish[idx] = pixels[idx + 2];
            pixels_publish[idx + 1] = pixels[idx + 1];
            pixels_publish[idx + 2] = pixels[idx];
            idx += 3;
        }
        return pixels_publish;
    }

 

*byte[] to int[]

http://www.java2s.com/Code/Java/Collections-Data-Structure/bytearraytointarray.htm

byte array to int array : Array Convert « Collections Data Structure « Java