aboutsummaryrefslogtreecommitdiffstats
path: root/src/tracker.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/tracker.c')
-rw-r--r--src/tracker.c245
1 files changed, 245 insertions, 0 deletions
diff --git a/src/tracker.c b/src/tracker.c
new file mode 100644
index 0000000..dd628bc
--- /dev/null
+++ b/src/tracker.c
@@ -0,0 +1,245 @@
+/*
+ An LV2 plugin to shape a signal in various ways.
+ Copyright 2011 David Robillard
+ Copyright 2003 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/ext/morph/morph.h"
+#include "lv2/lv2plug.in/ns/ext/options/options.h"
+#include "lv2/lv2plug.in/ns/lv2core/lv2.h"
+#include "common.h"
+#include "uris.h"
+
+#define TRACKER_GATE 0
+#define TRACKER_HATTACK 1
+#define TRACKER_HDECAY 2
+#define TRACKER_LATTACK 3
+#define TRACKER_LDECAY 4
+#define TRACKER_INPUT 5
+#define TRACKER_OUTPUT 6
+
+typedef struct {
+ const float* gate;
+ const float* hattack;
+ const float* hdecay;
+ const float* lattack;
+ const float* ldecay;
+ const float* input;
+ float* output;
+ float coeff;
+ float last_value;
+ uint32_t hattack_is_cv;
+ uint32_t hdecay_is_cv;
+ uint32_t lattack_is_cv;
+ uint32_t ldecay_is_cv;
+ URIs uris;
+} Tracker;
+
+static void
+cleanup(LV2_Handle instance)
+{
+ free(instance);
+}
+
+static void
+connect_port(LV2_Handle instance,
+ uint32_t port,
+ void* data)
+{
+ Tracker* plugin = (Tracker*)instance;
+
+ switch (port) {
+ case TRACKER_GATE:
+ plugin->gate = (const float*)data;
+ break;
+ case TRACKER_HATTACK:
+ plugin->hattack = (const float*)data;
+ break;
+ case TRACKER_HDECAY:
+ plugin->hdecay = (const float*)data;
+ break;
+ case TRACKER_LATTACK:
+ plugin->lattack = (const float*)data;
+ break;
+ case TRACKER_LDECAY:
+ plugin->ldecay = (const float*)data;
+ break;
+ case TRACKER_INPUT:
+ plugin->input = (const float*)data;
+ break;
+ case TRACKER_OUTPUT:
+ plugin->output = (float*)data;
+ break;
+ }
+}
+
+static uint32_t
+options_set(LV2_Handle instance,
+ const LV2_Options_Option* options)
+{
+ Tracker* plugin = (Tracker*)instance;
+ uint32_t ret = 0;
+ for (const LV2_Options_Option* o = options; o->key; ++o) {
+ if (o->context != LV2_OPTIONS_PORT) {
+ ret |= LV2_OPTIONS_ERR_BAD_SUBJECT;
+ } else if (o->key != plugin->uris.morph_currentType) {
+ ret |= LV2_OPTIONS_ERR_BAD_KEY;
+ } else if (o->type != plugin->uris.atom_URID) {
+ ret |= LV2_OPTIONS_ERR_BAD_VALUE;
+ } else {
+ LV2_URID port_type = *(const LV2_URID*)(o->value);
+ if (port_type != plugin->uris.lv2_ControlPort &&
+ port_type != plugin->uris.lv2_CVPort) {
+ ret |= LV2_OPTIONS_ERR_BAD_VALUE;
+ continue;
+ }
+
+ switch (o->subject) {
+ case TRACKER_HATTACK:
+ plugin->hattack_is_cv = (port_type == plugin->uris.lv2_CVPort);
+ break;
+ case TRACKER_HDECAY:
+ plugin->hdecay_is_cv = (port_type == plugin->uris.lv2_CVPort);
+ break;
+ case TRACKER_LATTACK:
+ plugin->lattack_is_cv = (port_type == plugin->uris.lv2_CVPort);
+ break;
+ case TRACKER_LDECAY:
+ plugin->ldecay_is_cv = (port_type == plugin->uris.lv2_CVPort);
+ break;
+ default:
+ ret |= LV2_OPTIONS_ERR_BAD_SUBJECT;
+ }
+ }
+ }
+ return ret;
+}
+
+static LV2_Handle
+instantiate(const LV2_Descriptor* descriptor,
+ double sample_rate,
+ const char* bundle_path,
+ const LV2_Feature* const* features)
+{
+ Tracker* plugin = (Tracker*)malloc(sizeof(Tracker));
+ if (!plugin) {
+ return NULL;
+ }
+
+ plugin->coeff = 2.0f * M_PI / (float)sample_rate;
+
+ plugin->hattack_is_cv = 0;
+ plugin->hdecay_is_cv = 0;
+ plugin->lattack_is_cv = 0;
+ plugin->ldecay_is_cv = 0;
+
+ map_uris(&plugin->uris, features);
+
+ return (LV2_Handle)plugin;
+}
+
+static void
+activate(LV2_Handle instance)
+{
+ Tracker* plugin = (Tracker*)instance;
+
+ plugin->last_value = 0.0f;
+}
+
+static void
+run(LV2_Handle instance,
+ uint32_t sample_count)
+{
+ Tracker* plugin = (Tracker*)instance;
+
+ /* Gate (array of floats of length sample_count) */
+ const float* gate = plugin->gate;
+
+ /* Gate High Attack Rate (array of floats of length 1 or sample_count) */
+ const float* hattack = plugin->hattack;
+
+ /* Gate High Decay Rate (array of floats of length 1 or sample_count) */
+ const float* hdecay = plugin->hdecay;
+
+ /* Gate Low Attack Rate (array of floats of length 1 or sample_count) */
+ const float* lattack = plugin->lattack;
+
+ /* Gate Low Decay Rate (array of floats of length 1 or sample_count) */
+ const float* ldecay = plugin->ldecay;
+
+ /* Input (array of floats of length sample_count) */
+ const float* input = plugin->input;
+
+ /* Output (array of floats of length sample_count) */
+ float* output = plugin->output;
+
+ /* Instance Data */
+ float coeff = plugin->coeff;
+ float last_value = plugin->last_value;
+
+ for (uint32_t s = 0; s < sample_count; ++s) {
+ const float in = input[s];
+ const float ha = hattack[s * plugin->hattack_is_cv];
+ const float hd = hdecay[s * plugin->hdecay_is_cv];
+ const float la = lattack[s * plugin->lattack_is_cv];
+ const float ld = ldecay[s * plugin->ldecay_is_cv];
+
+ float rate;
+ if (gate[s] > 0.0f) {
+ rate = in > last_value ? ha : hd;
+ } else {
+ rate = in > last_value ? la : ld;
+ }
+
+ rate = f_min(1.0f, rate * coeff);
+ last_value = last_value * (1.0f - rate) + in * rate;
+
+ output[s] = last_value;
+ }
+
+ plugin->last_value = last_value;
+}
+
+static const void*
+extension_data(const char* uri)
+{
+ static const LV2_Options_Interface options = { NULL, options_set };
+ if (!strcmp(uri, LV2_OPTIONS__interface)) {
+ return &options;
+ }
+ return NULL;
+}
+
+static const LV2_Descriptor descriptor = {
+ "http://drobilla.net/plugins/blop/tracker",
+ instantiate,
+ connect_port,
+ activate,
+ run,
+ NULL,
+ cleanup,
+ extension_data,
+};
+
+LV2_SYMBOL_EXPORT const LV2_Descriptor*
+lv2_descriptor(uint32_t index)
+{
+ switch (index) {
+ case 0: return &descriptor;
+ default: return NULL;
+ }
+}
generated by cgit v1.2.1 (git 2.18.0) at 2025-05-19 04:35:43 +0000