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author | David Robillard <d@drobilla.net> | 2011-10-03 05:22:14 +0000 |
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committer | David Robillard <d@drobilla.net> | 2011-10-03 05:22:14 +0000 |
commit | e550736dbb862d8333a4d7f2ede9804a3d48326c (patch) | |
tree | 185b6f0483cbfe2fae87bb61b0e123fb2353b5d5 /src/sync_pulse.c | |
download | blop.lv2-e550736dbb862d8333a4d7f2ede9804a3d48326c.tar.gz blop.lv2-e550736dbb862d8333a4d7f2ede9804a3d48326c.tar.bz2 blop.lv2-e550736dbb862d8333a4d7f2ede9804a3d48326c.zip |
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/sync_pulse.c')
-rw-r--r-- | src/sync_pulse.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/src/sync_pulse.c b/src/sync_pulse.c new file mode 100644 index 0000000..4dc9dad --- /dev/null +++ b/src/sync_pulse.c @@ -0,0 +1,205 @@ +/* + 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/lv2core/lv2.h" +#include "common.h" + +#define SYNCPULSE_FREQUENCY 0 +#define SYNCPULSE_PULSEWIDTH 1 +#define SYNCPULSE_GATE 2 +#define SYNCPULSE_OUTPUT 3 + +typedef struct { + float* frequency; + float* pulsewidth; + float* gate; + float* output; + float srate; + float phase; +} 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 = data; + break; + case SYNCPULSE_PULSEWIDTH: + plugin->pulsewidth = data; + break; + case SYNCPULSE_GATE: + plugin->gate = data; + break; + case SYNCPULSE_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) +{ + SyncPulse* plugin = (SyncPulse*)malloc(sizeof(SyncPulse)); + + plugin->srate = (float)sample_rate; + + return (LV2_Handle)plugin; +} + +static void +activate(LV2_Handle instance) +{ + SyncPulse* plugin = (SyncPulse*)instance; + + plugin->phase = 0.0f; +} + +static void +runSyncPulse_fapaga_oa(LV2_Handle instance, + uint32_t sample_count) +{ + SyncPulse* plugin = (SyncPulse*)instance; + + /* Frequency (array of float of length sample_count) */ + float* frequency = plugin->frequency; + + /* Pulse Width (array of float of length sample_count) */ + float* pulsewidth = plugin->pulsewidth; + + /* Gate (array of float of length sample_count) */ + float* gate = plugin->gate; + + /* Output (pointer to float value) */ + float* output = plugin->output; + + /* Instance data */ + float phase = plugin->phase; + float srate = plugin->srate; + + float freq; + float pwidth; + + for (uint32_t s = 0; s < sample_count; ++s) { + if (gate[s] > 0.0f) { + freq = frequency[s]; + pwidth = f_clip(pulsewidth[s], 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 void +runSyncPulse_fcpcga_oa(LV2_Handle instance, + uint32_t sample_count) +{ + SyncPulse* plugin = (SyncPulse*)instance; + + /* Frequency (float value) */ + float frequency = *(plugin->frequency); + + /* Pulse Width (float value) */ + float pulsewidth = f_clip(*(plugin->pulsewidth), 0.0f, 1.0f); + + /* Gate (array of float of length sample_count) */ + float* gate = plugin->gate; + + /* Output (pointer to float value) */ + float* output = plugin->output; + + /* Instance Data */ + float phase = plugin->phase; + float srate = plugin->srate; + + pulsewidth *= srate; + + for (uint32_t s = 0; s < sample_count; ++s) { + if (gate[s] > 0.0f) { + if (phase < pulsewidth) { + output[s] = 1.0f; + } else { + output[s] = -1.0f; + } + + phase += frequency; + 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 LV2_Descriptor descriptor = { + "http://drobilla.net/plugins/blip/sync_pulse", + instantiate, + connect_port, + activate, + runSyncPulse_fcpcga_oa, + NULL, + cleanup, + NULL, +}; + +LV2_SYMBOL_EXPORT const LV2_Descriptor* +lv2_descriptor(uint32_t index) +{ + switch (index) { + case 0: return &descriptor; + default: return NULL; + } +} |