/*
 * 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 ColorChannelProcessing_opt_splitjoin.str
 * @version 1.0
 */

// replacement code: wrap if around adds of separately-defined splitjoin's
int->int pipeline ColorChannelProcessing(int width, 
                                         int height, 
                                         portal<MotionPrediction> UpdatePortal_picture_type, 
                                         int the_chroma_format,
                                         portal<SendBackReferenceFrame> UpdatePortal_picture_type3) {
    if (the_chroma_format == 1) {
        add LumChromFormatOne(width, 
                              height, 
                              UpdatePortal_picture_type, 
                              the_chroma_format, 
                              UpdatePortal_picture_type3);
    } else {
        add LumChromFormatOther(width, 
                                height, 
                                UpdatePortal_picture_type, 
                                the_chroma_format, 
                                UpdatePortal_picture_type3);
    }
}

// splitjoin pulled out above
int->int splitjoin LumChromFormatOne(int width, 
                                     int height, 
                                     portal<MotionPrediction> UpdatePortal_picture_type,
                                     int the_chroma_format,
                                     portal<SendBackReferenceFrame> UpdatePortal_picture_type3) {
    split roundrobin(4*75, 2*75);
    add LuminanceChannelProcessing(width, 
                                   height, 
                                   UpdatePortal_picture_type, 
                                   the_chroma_format, 
                                   UpdatePortal_picture_type3);
    add int->int splitjoin {
        split roundrobin(75);
        add ChrominanceChannelProcessing(width, 
                                         height, 
                                         UpdatePortal_picture_type, 
                                         the_chroma_format, 
                                         UpdatePortal_picture_type3);
        add ChrominanceChannelProcessing(width, 
                                         height, 
                                         UpdatePortal_picture_type, 
                                         the_chroma_format, 
                                         UpdatePortal_picture_type3);
        join roundrobin(1, 1);
    }
    join roundrobin(1, 2);
}

// splitjoin pulled out above
int->int splitjoin LumChromFormatOther(int width, 
                                       int height, 
                                       portal<MotionPrediction> UpdatePortal_picture_type,
                                       int the_chroma_format,
                                       portal<SendBackReferenceFrame> UpdatePortal_picture_type3) {
    split roundrobin(4*75, 4*75);
    add LuminanceChannelProcessing(width, 
                                   height, 
                                   UpdatePortal_picture_type, 
                                   the_chroma_format, 
                                   UpdatePortal_picture_type3);
    add int->int splitjoin {
        split roundrobin(75);
        add ChrominanceChannelProcessing(width, 
                                         height, 
                                         UpdatePortal_picture_type, 
                                         the_chroma_format, 
                                         UpdatePortal_picture_type3);
        add ChrominanceChannelProcessing(width, 
                                         height, 
                                         UpdatePortal_picture_type, 
                                         the_chroma_format, 
                                         UpdatePortal_picture_type3);
        join roundrobin(1, 1);
    }
    join roundrobin(1, 2);
}