android YUV轉RGB

在百度找到了YUV轉RGB的方法，但發現顏色失真，誤打誤撞給修正過來了，下面爲正確代碼

	static public void decodeYUV420SP(int[] rgba, 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;

				rgba[yp] = 0xff000000 | ((b << 6) & 0xff0000)
						| ((g >> 2) & 0xff00) | ((r >> 10) & 0xff);
//				下面爲百度到的方法，其實就是r和b變量調換下位置
//				rgba[yp] = 0xff000000 | ((r << 6) & 0xff0000)
//						| ((g >> 2) & 0xff00) | ((b >> 10) & 0xff);
			}
		}
	}