/*
 * Copyright 2005 by the Massachusetts Institute of Technology.
 *
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for any purpose and without
 * fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting
 * documentation, and that the name of M.I.T. not be used in
 * advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.
 * M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 */

/**
 * @description
 * This file contains functions that allow one to decode MPEG-2 compliant video. 
 * The code is based on the MPEG-2 specification (ISO/IEC 13818-2). The MPEG-2 decoding
 * is a work in progress, although it works within a limited test range. Throughout the 
 * source code, citations are made in cases where an understanding of the code would be
 * helped by looking at an outside source. The format I have chosen is 
 * (cite NUM#, LOOKUP_INFO). NUM=1 refers to ISO/IEC: 13818-2, and NUM=2 refers to the reference
 * MPEG implementation written in C, available at [www.mpeg.org].
 *
 * @author <a href="mailto:madrake@gmail.com">Matthew Drake</a>
 * @file DescrambleAndMotionCompensate.str
 * @version 1.0
 */

/**
 * @internal
 */
int->int pipeline DescrambleAndMotionCompensate(int width, 
                                                int height, 
                                                int vertical_upsample_factor,
                                                int horizontal_upsample_factor,
                                                portal<MotionPrediction> UpdatePortal_picture_type,
                                                int temp,
                                                int the_chroma_format,
                                                portal<SendBackReferenceFrame> UpdatePortal_picture_type3) {
    add int->int splitjoin {
        split roundrobin(64, 8, 1, 1, 1);
        add Identity<int>;
        add MotionVectorChannelDownscale(horizontal_upsample_factor,
                                         vertical_upsample_factor);
        add Identity<int>;
        add Identity<int>;
        add Identity<int>;
        join roundrobin(64, 8, 1, 1, 1);
    }  
      
    add MotionPrediction_wrapper(width/horizontal_upsample_factor, 
                                 height/vertical_upsample_factor,
                                 UpdatePortal_picture_type,
                                 UpdatePortal_picture_type3);
}

int->int splitjoin MotionVectorChannelDownscale(int horizontal_upsample_factor,
                                                int vertical_upsample_factor) {
    split roundrobin(1);
    add DivideBy(horizontal_upsample_factor);
    add DivideBy(vertical_upsample_factor);
    join roundrobin(1);
}