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-rw-r--r--src/sync_pulse.c213
1 files changed, 213 insertions, 0 deletions
diff --git a/src/sync_pulse.c b/src/sync_pulse.c
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+++ b/src/sync_pulse.c
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+/*
+ An LV2 plugin to generate a non-bandlimited variable-pulse waveform with gate
+ for trigger and sync.
+ 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 "uris.h"
+#include "common.h"
+
+#define SYNCPULSE_FREQUENCY 0
+#define SYNCPULSE_PULSEWIDTH 1
+#define SYNCPULSE_GATE 2
+#define SYNCPULSE_OUTPUT 3
+
+typedef struct {
+ const float* frequency;
+ const float* pulsewidth;
+ const float* gate;
+ float* output;
+ float srate;
+ float phase;
+ uint32_t frequency_is_cv;
+ uint32_t pulsewidth_is_cv;
+ URIs uris;
+} SyncPulse;
+
+static void
+cleanup(LV2_Handle instance)
+{
+ free(instance);
+}
+
+static void
+connect_port(LV2_Handle instance,
+ uint32_t port,
+ void* data)
+{
+ SyncPulse* plugin = (SyncPulse*)instance;
+
+ switch (port) {
+ case SYNCPULSE_FREQUENCY:
+ plugin->frequency = (const float*)data;
+ break;
+ case SYNCPULSE_PULSEWIDTH:
+ plugin->pulsewidth = (const float*)data;
+ break;
+ case SYNCPULSE_GATE:
+ plugin->gate = (const float*)data;
+ break;
+ case SYNCPULSE_OUTPUT:
+ plugin->output = (float*)data;
+ break;
+ }
+}
+
+static uint32_t
+options_set(LV2_Handle instance,
+ const LV2_Options_Option* options)
+{
+ SyncPulse* plugin = (SyncPulse*)malloc(sizeof(SyncPulse));
+ 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 SYNCPULSE_FREQUENCY:
+ plugin->frequency_is_cv = (port_type == plugin->uris.lv2_CVPort);
+ break;
+ case SYNCPULSE_PULSEWIDTH:
+ plugin->pulsewidth_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)
+{
+ SyncPulse* plugin = (SyncPulse*)malloc(sizeof(SyncPulse));
+
+ if (plugin) {
+ plugin->srate = (float)sample_rate;
+ plugin->frequency_is_cv = 0;
+ plugin->pulsewidth_is_cv = 0;
+ map_uris(&plugin->uris, features);
+ }
+
+ return (LV2_Handle)plugin;
+}
+
+static void
+activate(LV2_Handle instance)
+{
+ SyncPulse* plugin = (SyncPulse*)instance;
+
+ plugin->phase = 0.0f;
+}
+
+static void
+run(LV2_Handle instance,
+ uint32_t sample_count)
+{
+ SyncPulse* plugin = (SyncPulse*)instance;
+
+ /* Frequency (array of float of length sample_count) */
+ const float* frequency = plugin->frequency;
+
+ /* Pulse Width (array of float of length sample_count) */
+ const float* pulsewidth = plugin->pulsewidth;
+
+ /* Gate (array of float of length sample_count) */
+ const float* gate = plugin->gate;
+
+ /* Output (pointer to float value) */
+ float* output = plugin->output;
+
+ /* Instance data */
+ float phase = plugin->phase;
+ float srate = plugin->srate;
+
+ for (uint32_t s = 0; s < sample_count; ++s) {
+ if (gate[s] > 0.0f) {
+ const float freq = frequency[s * plugin->frequency_is_cv];
+ const float pw = pulsewidth[s * plugin->pulsewidth_is_cv];
+ const float pwidth = f_clip(pw, 0.0f, 1.0f) * srate;
+
+ if (phase < pwidth) {
+ output[s] = 1.0f;
+ } else {
+ output[s] = -1.0f;
+ }
+
+ phase += freq;
+ if (phase < 0.0f) {
+ phase += srate;
+ } else if (phase > srate) {
+ phase -= srate;
+ }
+ } else {
+ output[s] = 0.0f;
+ phase = 0.0f;
+ }
+ }
+
+ plugin->phase = phase;
+}
+
+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/sync_pulse",
+ 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;
+ }
+}