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-rw-r--r--src/amp.c142
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+/*
+ An LV2 plugin representing a simple mono amplifier.
+ 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"
+#include "math_func.h"
+
+#define AMP_GAIN 0
+#define AMP_INPUT 1
+#define AMP_OUTPUT 2
+
+typedef struct {
+ const float* gain;
+ const float* input;
+ float* output;
+} Amp;
+
+static void
+cleanup(LV2_Handle instance)
+{
+ free(instance);
+}
+
+static void
+connect_port(LV2_Handle instance,
+ uint32_t port,
+ void* data)
+{
+ Amp* plugin = (Amp*)instance;
+
+ switch (port) {
+ case AMP_GAIN:
+ plugin->gain = data;
+ break;
+ case AMP_INPUT:
+ plugin->input = data;
+ break;
+ case AMP_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)
+{
+ Amp* plugin = (Amp*)malloc(sizeof(Amp));
+
+ return (LV2_Handle)plugin;
+}
+
+static void
+runAmp_gaia_oa(LV2_Handle instance,
+ uint32_t sample_count)
+{
+ Amp* plugin = (Amp*)instance;
+
+ /* Gain (dB) */
+ const float* gain = plugin->gain;
+
+ /* Input */
+ const float* input = plugin->input;
+
+ /* Output */
+ float* output = plugin->output;
+
+ float gn;
+ float in;
+ float scale;
+
+ for (uint32_t s = 0; s < sample_count; ++s) {
+ gn = gain[s];
+ in = input[s];
+
+ scale = (float)EXPF(M_LN10 * gn * 0.05f);
+
+ output[s] = scale * in;
+ }
+}
+
+static void
+runAmp_gcia_oa(LV2_Handle instance,
+ uint32_t sample_count)
+{
+ Amp* plugin = (Amp*)instance;
+
+ /* Gain (dB) */
+ const float gain = *(plugin->gain);
+
+ /* Input */
+ const float* input = plugin->input;
+
+ /* Output */
+ float* output = plugin->output;
+
+ float in;
+ float scale = (float)EXPF(M_LN10 * gain * 0.05f);
+ for (uint32_t s = 0; s < sample_count; s++) {
+ in = input[s];
+
+ output[s] = scale * in;
+ }
+}
+
+static const LV2_Descriptor descriptor = {
+ "http://drobilla.net/plugins/blip/amp",
+ instantiate,
+ connect_port,
+ NULL,
+ runAmp_gcia_oa,
+ NULL,
+ cleanup,
+ NULL,
+};
+
+LV2_SYMBOL_EXPORT const LV2_Descriptor*
+lv2_descriptor(uint32_t index)
+{
+ switch (index) {
+ case 0: return &descriptor;
+ default: return NULL;
+ }
+}