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stereoroute.c
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stereoroute.c
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/* stereoroute -- LV2 stereo control
*
* Copyright (C) 2013,2015 Robin Gareus <robin@gareus.org>
*
* This program 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 2, or (at your option)
* any later version.
*
* This program 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 program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#ifdef HAVE_LV2_1_18_6
#include <lv2/core/lv2.h>
#else
#include <lv2/lv2plug.in/ns/lv2core/lv2.h>
#endif
#define MNR_URI "http://gareus.org/oss/lv2/stereoroute"
typedef enum {
MNR_ROUTE,
MNR_INL,
MNR_INR,
MNR_OUTL,
MNR_OUTR
} PortIndex;
typedef struct {
/* control ports */
float* route;
float* input[2];
float* output[2];
} StereoRoute;
static void
run(LV2_Handle instance, uint32_t n_samples)
{
StereoRoute* self = (StereoRoute*)instance;
const int route = rintf (*self->route);
// TODO x-fade on change ?
switch (route) {
case 0:
// monoize -3 dB
for (uint32_t s = 0; s < n_samples; ++s) {
self->output[0][s] = self->output[1][s] = .7079f * (self->input[0][s] + self->input[1][s]);
}
break;
case 1:
// monoize -6 dB
for (uint32_t s = 0; s < n_samples; ++s) {
self->output[0][s] = self->output[1][s] = .5f * (self->input[0][s] + self->input[1][s]);
}
break;
case 2:
// monoize -0 dB
for (uint32_t s = 0; s < n_samples; ++s) {
self->output[0][s] = self->output[1][s] = (self->input[0][s] + self->input[1][s]);
}
break;
case 3:
// left channel mono
if (self->input[0] != self->output[0]) {
memcpy (self->output[0], self->input[0], n_samples * sizeof(float));
}
memcpy (self->output[1], self->input[0], n_samples * sizeof(float));
break;
case 4:
// right channel mono
memcpy (self->output[0], self->input[1], n_samples * sizeof(float));
if (self->input[1] != self->output[1]) {
memcpy (self->output[1], self->input[1], n_samples * sizeof(float));
}
break;
case 5:
// swap channels - can't use memcpy due to in-place
for (uint32_t s = 0; s < n_samples; ++s) {
const float tmpL = self->input[0][s];
const float tmpR = self->input[1][s];
self->output[0][s] = tmpR;
self->output[1][s] = tmpL;
}
break;
default:
case 6:
// straight
if (self->input[0] != self->output[0]) {
memcpy (self->output[0], self->input[0], n_samples * sizeof(float));
}
if (self->input[1] != self->output[1]) {
memcpy (self->output[1], self->input[1], n_samples * sizeof(float));
}
break;
case 7:
// left/right -> mid/side
for (uint32_t s = 0; s < n_samples; ++s) {
const float tmpS = self->input[0][s] - self->input[1][s];
self->output[0][s] = .5 * (self->input[0][s] + self->input[1][s]);
self->output[1][s] = .5 * tmpS;
}
break;
case 8:
// mid/side <> left/right
for (uint32_t s = 0; s < n_samples; ++s) {
const float tmpS = self->input[0][s] - self->input[1][s];
self->output[0][s] = (self->input[0][s] + self->input[1][s]);
self->output[1][s] = tmpS;
}
break;
}
}
static LV2_Handle
instantiate(const LV2_Descriptor* descriptor,
double rate,
const char* bundle_path,
const LV2_Feature* const* features)
{
StereoRoute* self = (StereoRoute*)calloc(1, sizeof(StereoRoute));
if (!self) return NULL;
return (LV2_Handle)self;
}
static void
connect_port(LV2_Handle instance,
uint32_t port,
void* data)
{
StereoRoute* self = (StereoRoute*)instance;
switch ((PortIndex)port) {
case MNR_ROUTE:
self->route = data;
break;
case MNR_INL:
self->input[0] = data;
break;
case MNR_INR:
self->input[1] = data;
break;
case MNR_OUTL:
self->output[0] = data;
break;
case MNR_OUTR:
self->output[1] = data;
break;
}
}
static void
cleanup(LV2_Handle instance)
{
free(instance);
}
const void*
extension_data(const char* uri)
{
return NULL;
}
static const LV2_Descriptor descriptor = {
MNR_URI,
instantiate,
connect_port,
NULL,
run,
NULL,
cleanup,
extension_data
};
#undef LV2_SYMBOL_EXPORT
#ifdef _WIN32
# define LV2_SYMBOL_EXPORT __declspec(dllexport)
#else
# define LV2_SYMBOL_EXPORT __attribute__ ((visibility ("default")))
#endif
LV2_SYMBOL_EXPORT
const LV2_Descriptor*
lv2_descriptor(uint32_t index)
{
switch (index) {
case 0:
return &descriptor;
default:
return NULL;
}
}