/*
  An LV2 plugin to calculate the product of two signals.
  Copyright 2011 David Robillard
  Copyright 2002 Mike Rawes

  This is free software: you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This software is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this software.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdlib.h>
#include "lv2/lv2plug.in/ns/lv2core/lv2.h"

#define PRODUCT_INPUT1 0
#define PRODUCT_INPUT2 1
#define PRODUCT_OUTPUT 2

typedef struct {
	float* input1;
	float* input2;
	float* output;
} Product;

static void
cleanup(LV2_Handle instance)
{
	free(instance);
}

static void
connect_port(LV2_Handle instance,
             uint32_t   port,
             void*      data)
{
	Product* plugin = (Product*)instance;

	switch (port) {
	case PRODUCT_INPUT1:
		plugin->input1 = data;
		break;
	case PRODUCT_INPUT2:
		plugin->input2 = data;
		break;
	case PRODUCT_OUTPUT:
		plugin->output = data;
		break;
	}
}

static LV2_Handle
instantiate(const LV2_Descriptor*     descriptor,
            double                    sample_rate,
            const char*               bundle_path,
            const LV2_Feature* const* features)
{
	Product* plugin = (Product*)malloc(sizeof(Product));

	return (LV2_Handle)plugin;
}

static void
runProduct_iaia_oa(LV2_Handle instance,
                   uint32_t   sample_count)
{
	Product* plugin = (Product*)instance;

	/* First Input (array of floats of length sample_count) */
	float* input1 = plugin->input1;

	/* Second Input (array of floats of length sample_count) */
	float* input2 = plugin->input2;

	/* Output (array of floats of length sample_count) */
	float* output = plugin->output;

	float in1;
	float in2;

	for (uint32_t s = 0; s < sample_count; ++s) {
		in1 = input1[s];
		in2 = input2[s];

		output[s] = in1 * in2;
	}
}

static void
runProduct_iaic_oa(LV2_Handle instance,
                   uint32_t   sample_count)
{
	Product* plugin = (Product*)instance;

	/* First Input (array of floats of length sample_count) */
	float* input1 = plugin->input1;

	/* Second Input (float value) */
	float input2 = *(plugin->input2);

	/* Output (array of floats of length sample_count) */
	float* output = plugin->output;

	float in1;

	for (uint32_t s = 0; s < sample_count; ++s) {
		in1 = input1[s];

		output[s] = in1 * input2;
	}
}

static void
runProduct_icic_oc(LV2_Handle instance,
                   uint32_t   sample_count)
{
	Product* plugin = (Product*)instance;

	/* First Input (float value) */
	float input1 = *(plugin->input1);

	/* Second Input (float value) */
	float input2 = *(plugin->input2);

	/* Output (pointer to float value) */
	float* output = plugin->output;

	output[0] = input1 * input2;
}

static const LV2_Descriptor descriptor = {
	"http://drobilla.net/plugins/blip/product",
	instantiate,
	connect_port,
	NULL,
	runProduct_icic_oc,
	NULL,
	cleanup,
	NULL,
};

LV2_SYMBOL_EXPORT const LV2_Descriptor*
lv2_descriptor(uint32_t index)
{
	switch (index) {
	case 0:  return &descriptor;
	default: return NULL;
	}
}