hrit_base.py 文件源码

def dec10216(inbuf):
    arr10 = inbuf.astype(np.uint16)
    arr16 = np.zeros((int(len(arr10) * 4 / 5),), dtype=np.uint16)
    arr10_len = int((len(arr16) * 5) / 4)
    arr10 = arr10[:arr10_len]  # adjust size
    """
    /*
     * pack 4 10-bit words in 5 bytes into 4 16-bit words
     *
     * 0       1       2       3       4       5
     * 01234567890123456789012345678901234567890
     * 0         1         2         3         4
     */
    ip = &in_buffer[i];
    op = &out_buffer[j];
    op[0] = ip[0]*4 + ip[1]/64;
    op[1] = (ip[1] & 0x3F)*16 + ip[2]/16;
    op[2] = (ip[2] & 0x0F)*64 + ip[3]/4;
    op[3] = (ip[3] & 0x03)*256 +ip[4];
    """
    arr16.flat[::4] = np.left_shift(arr10[::5], 2) + \
        np.right_shift((arr10[1::5]), 6)
    arr16.flat[1::4] = np.left_shift((arr10[1::5] & 63), 4) + \
        np.right_shift((arr10[2::5]), 4)
    arr16.flat[2::4] = np.left_shift(arr10[2::5] & 15, 6) + \
        np.right_shift((arr10[3::5]), 2)
    arr16.flat[3::4] = np.left_shift(arr10[3::5] & 3, 8) + \
        arr10[4::5]
    return arr16