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-rw-r--r--plugins/eg-amp.lv2/amp.c126
1 files changed, 126 insertions, 0 deletions
diff --git a/plugins/eg-amp.lv2/amp.c b/plugins/eg-amp.lv2/amp.c
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+++ b/plugins/eg-amp.lv2/amp.c
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+/*
+ LV2 Amp Example Plugin
+ Copyright 2006-2011 Steve Harris, David Robillard.
+ Permission to use, copy, modify, and/or distribute this software for any
+ purpose with or without fee is hereby granted, provided that the above
+ copyright notice and this permission notice appear in all copies.
+
+ THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "lv2/lv2plug.in/ns/lv2core/lv2.h"
+
+#define AMP_URI "http://lv2plug.in/plugins/eg-amp"
+#define AMP_GAIN 0
+#define AMP_INPUT 1
+#define AMP_OUTPUT 2
+
+typedef struct {
+ float* gain;
+ float* input;
+ float* output;
+} Amp;
+
+static LV2_Handle
+instantiate(const LV2_Descriptor* descriptor,
+ double rate,
+ const char* bundle_path,
+ const LV2_Feature* const* features)
+{
+ Amp* amp = (Amp*)malloc(sizeof(Amp));
+
+ return (LV2_Handle)amp;
+}
+
+static void
+connect_port(LV2_Handle instance,
+ uint32_t port,
+ void* data)
+{
+ Amp* amp = (Amp*)instance;
+
+ switch (port) {
+ case AMP_GAIN:
+ amp->gain = data;
+ break;
+ case AMP_INPUT:
+ amp->input = data;
+ break;
+ case AMP_OUTPUT:
+ amp->output = data;
+ break;
+ }
+}
+
+static void
+activate(LV2_Handle instance)
+{
+}
+
+#define DB_CO(g) ((g) > -90.0f ? powf(10.0f, (g) * 0.05f) : 0.0f)
+
+static void
+run(LV2_Handle instance, uint32_t n_samples)
+{
+ Amp* amp = (Amp*)instance;
+
+ const float gain = *(amp->gain);
+ const float* const input = amp->input;
+ float* const output = amp->output;
+
+ const float coef = DB_CO(gain);
+
+ for (uint32_t pos = 0; pos < n_samples; pos++) {
+ output[pos] = input[pos] * coef;
+ }
+}
+
+static void
+deactivate(LV2_Handle instance)
+{
+}
+
+static void
+cleanup(LV2_Handle instance)
+{
+ free(instance);
+}
+
+const void*
+extension_data(const char * uri)
+{
+ return NULL;
+}
+
+static const LV2_Descriptor descriptor = {
+ AMP_URI,
+ instantiate,
+ connect_port,
+ activate,
+ run,
+ deactivate,
+ cleanup,
+ extension_data
+};
+
+LV2_SYMBOL_EXPORT
+const LV2_Descriptor*
+lv2_descriptor(uint32_t index)
+{
+ switch (index) {
+ case 0:
+ return &descriptor;
+ default:
+ return NULL;
+ }
+}