j_equal.cpp

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/** @file
 *
 * @ingroup implementationMaxExternalsAudioGraph
 *
 * @brief j= : Creates an AudioGraph external that is able to wrap any Jamoma class
 *
 * @details
 *
 * @authors Tim Place, Trond Lossius
 *
 * @copyright © 2012 by Timothy Place @n
 * This code is licensed under the terms of the "New BSD License" @n
 * http://creativecommons.org/licenses/BSD/
 */

#include "maxAudioGraph.h"

// Prototypes for methods
t_object*   jamoma_new(t_symbol *s, long argc, t_atom* argv);
t_object*   MaxAudioGraphWrappedClass_new(t_symbol *name, long argc, t_atom* argv);

// Globals
static t_class*     s_jamoma_class;
static t_hashtab*   s_jamoma_class_hash = NULL;

/************************************************************************************/
// Define a Max class that does essentially nothing but let users type the name into an object box.
// The class we actually use will be defined in the new method.

int C74_EXPORT main(void)
{
    s_jamoma_class = class_new("j=", (method)jamoma_new, (method)NULL, 0 /*sizeof(t_object)*/, (method)0L, A_GIMME, 0);
    class_register(CLASS_BOX, s_jamoma_class);

    common_symbols_init();
    TTAudioGraphInit();
    return 0;
}

/************************************************************************************/
// When a new instance of jamoma~ is created, we look at the first argument to get a Jamoma class name.
// Then we wrap that class as a Max class.
// Finally, we proceed to then instantiate the new Max class instead of the jamoma~ Max class.

t_object* jamoma_new(t_symbol *s, long argc, t_atom* argv)
{
    int                             attrstart = attr_args_offset(argc, argv);
    int                             i = 0;
    int                             channelCount = 2;
    t_symbol                        *className = gensym("gain");
    MaxAudioGraphWrappedClassPtr    classWrapper = NULL;
    char                            maxClassName[256];

    if (!attrstart) {
        error("must specify a jamoma class as the first argument");
        return NULL;
    }
    while (attrstart--) {
        if (atom_gettype(argv+i) == A_LONG)
            channelCount = atom_getlong(argv+i);
        else if (atom_gettype(argv+i) == A_SYM)
            className = atom_getsym(argv+i);
        i++;
    }
    
    snprintf(maxClassName, 256, "j.%s=", className->s_name);

    if (!s_jamoma_class_hash)
        s_jamoma_class_hash = hashtab_new(0);
    hashtab_lookup(s_jamoma_class_hash, className, (t_object**)&classWrapper);

    if (!classWrapper) {
        wrapAsMaxAudioGraph(className->s_name, maxClassName, &classWrapper);
        hashtab_store(s_jamoma_class_hash, className, (t_object*)(classWrapper));
    }

    return MaxAudioGraphWrappedClass_new(gensym(maxClassName), argc-1, argv+1);
}