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authorDavid Robillard <d@drobilla.net>2011-10-03 05:22:14 +0000
committerDavid Robillard <d@drobilla.net>2011-10-03 05:22:14 +0000
commite550736dbb862d8333a4d7f2ede9804a3d48326c (patch)
tree185b6f0483cbfe2fae87bb61b0e123fb2353b5d5 /src/square.c
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Add 'blip', an LV2 port of the LADSPA 'blop' collection.
git-svn-id: http://svn.drobilla.net/lad/trunk/plugins/blip.lv2@3525 a436a847-0d15-0410-975c-d299462d15a1
Diffstat (limited to 'src/square.c')
-rw-r--r--src/square.c172
1 files changed, 172 insertions, 0 deletions
diff --git a/src/square.c b/src/square.c
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index 0000000..001a47e
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+++ b/src/square.c
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+/*
+ An LV2 plugin to generate a bandlimited square waveform.
+ 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 "wavedata.h"
+
+#define SQUARE_FREQUENCY 0
+#define SQUARE_OUTPUT 1
+
+typedef struct {
+ float* frequency;
+ float* output;
+ float phase;
+ Wavedata wdat;
+} Square;
+
+static void
+connect_port(LV2_Handle instance,
+ uint32_t port,
+ void* data)
+{
+ Square* plugin = (Square*)instance;
+
+ switch (port) {
+ case SQUARE_FREQUENCY:
+ plugin->frequency = data;
+ break;
+ case SQUARE_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)
+{
+ Square* plugin = (Square*)malloc(sizeof(Square));
+
+ if (wavedata_load(&plugin->wdat, BLOP_DLSYM_SQUARE, sample_rate)) {
+ free(plugin);
+ return NULL;
+ }
+
+ return (LV2_Handle)plugin;
+}
+
+static void
+cleanup(LV2_Handle instance)
+{
+ Square* plugin = (Square*)instance;
+
+ wavedata_unload(&plugin->wdat);
+ free(instance);
+}
+
+static void
+activate(LV2_Handle instance)
+{
+ Square* plugin = (Square*)instance;
+
+ plugin->phase = 0.0f;
+}
+
+static void
+runSquare_fa_oa(LV2_Handle instance,
+ uint32_t sample_count)
+{
+ Square* plugin = (Square*)instance;
+
+ /* Frequency (array of float of length sample_count) */
+ float* frequency = plugin->frequency;
+
+ /* Output (pointer to float value) */
+ float* output = plugin->output;
+
+ /* Instance data */
+ Wavedata* wdat = &plugin->wdat;
+ float phase = plugin->phase;
+
+ float freq;
+
+ for (uint32_t s = 0; s < sample_count; ++s) {
+ freq = frequency[s];
+
+ /* Get table to play */
+ wavedata_get_table(wdat, freq);
+
+ /* Get interpolated sample */
+ output[s] = wavedata_get_sample(wdat, phase);
+
+ /* Update phase, wrapping if necessary */
+ phase += wdat->frequency;
+ if (phase < 0.0f) {
+ phase += wdat->sample_rate;
+ } else if (phase > wdat->sample_rate) {
+ phase -= wdat->sample_rate;
+ }
+ }
+ plugin->phase = phase;
+}
+
+static void
+runSquare_fc_oa(LV2_Handle instance,
+ uint32_t sample_count)
+{
+ Square* plugin = (Square*)instance;
+
+ /* Frequency (float value) */
+ float frequency = *(plugin->frequency);
+
+ /* Output (pointer to float value) */
+ float* output = plugin->output;
+
+ /* Instance data */
+ Wavedata* wdat = &plugin->wdat;
+ float phase = plugin->phase;
+
+ wavedata_get_table(wdat, frequency);
+
+ for (uint32_t s = 0; s < sample_count; ++s) {
+ output[s] = wavedata_get_sample(wdat, phase);
+
+ /* Update phase, wrapping if necessary */
+ phase += wdat->frequency;
+ if (phase < 0.0f) {
+ phase += wdat->sample_rate;
+ } else if (phase > wdat->sample_rate) {
+ phase -= wdat->sample_rate;
+ }
+ }
+ plugin->phase = phase;
+}
+
+static const LV2_Descriptor descriptor = {
+ "http://drobilla.net/plugins/blip/square",
+ instantiate,
+ connect_port,
+ activate,
+ runSquare_fc_oa,
+ NULL,
+ cleanup,
+ NULL,
+};
+
+LV2_SYMBOL_EXPORT const LV2_Descriptor*
+lv2_descriptor(uint32_t index)
+{
+ switch (index) {
+ case 0: return &descriptor;
+ default: return NULL;
+ }
+}