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Diffstat (limited to 'src/range_trans.c')
-rw-r--r-- | src/range_trans.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/range_trans.c b/src/range_trans.c new file mode 100644 index 0000000..5c32d91 --- /dev/null +++ b/src/range_trans.c @@ -0,0 +1,131 @@ +/* This file is an audio plugin. Copyright 2005-2011 David Robillard. + * + * This plugin 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 of the License, or (at your option) + * any later version. + * + * This plugin 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 + * details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA + */ + +#define _XOPEN_SOURCE 500 /* strdup */ +#include <stdlib.h> +#include <string.h> +#include <math.h> + +#include <lv2/lv2plug.in/ns/lv2core/lv2.h> + +#define RANGETRANS_BASE_ID 4210 + +#define RANGETRANS_NUM_PORTS 6 + +/* Port Numbers */ +#define RANGETRANS_IN_MIN 0 +#define RANGETRANS_IN_MAX 1 +#define RANGETRANS_OUT_MIN 2 +#define RANGETRANS_OUT_MAX 3 +#define RANGETRANS_INPUT 4 +#define RANGETRANS_OUTPUT 5 + +/* All state information for plugin */ +typedef struct +{ + /* Ports */ + float* in_min; + float* in_max; + float* out_min; + float* out_max; + float* input; + float* output; +} RangeTrans; + +/* Construct a new plugin instance */ +static LV2_Handle +instantiate(const LV2_Descriptor* descriptor, + double sample_rate, + const char* bundle_path, + const LV2_Feature* const* features) +{ + return (LV2_Handle)malloc(sizeof(RangeTrans)); +} + +/* Connect a port to a data location */ +static void +connect_port(LV2_Handle instance, + uint32_t port, + void* location) +{ + RangeTrans* plugin; + + plugin = (RangeTrans*)instance; + switch (port) { + case RANGETRANS_IN_MIN: + plugin->in_min = location; + break; + case RANGETRANS_IN_MAX: + plugin->in_max = location; + break; + case RANGETRANS_OUT_MIN: + plugin->out_min = location; + break; + case RANGETRANS_OUT_MAX: + plugin->out_max = location; + break; + case RANGETRANS_INPUT: + plugin->input = location; + break; + case RANGETRANS_OUTPUT: + plugin->output = location; + break; + } +} + +static void +run(LV2_Handle instance, uint32_t nframes) +{ + const RangeTrans* const plugin = (RangeTrans*)instance; + const float* const in_min = plugin->in_min; + const float* const in_max = plugin->in_max; + const float* const out_min = plugin->out_min; + const float* const out_max = plugin->out_max; + const float* const input = plugin->input; + float* const output = plugin->output; + unsigned long i; + + for (i = 0; i < nframes; ++i) + output[i] = ((input[i] - in_min[i]) / (in_max[i] - in_min[i])) + * (out_max[i] - out_min[i]) + out_min[i]; +} + +static void +cleanup(LV2_Handle instance) +{ + free(instance); +} + +static const LV2_Descriptor descriptor = { + "http://drobilla.net/plugins/omins/range_trans", + instantiate, + connect_port, + NULL, + run, + NULL, + cleanup, + NULL, +}; + +LV2_SYMBOL_EXPORT const LV2_Descriptor* +lv2_descriptor(uint32_t index) +{ + switch (index) { + case 0: return &descriptor; + default: return NULL; + } +} |