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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_square.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_square.c')
-rw-r--r-- | src/sync_square.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/src/sync_square.c b/src/sync_square.c new file mode 100644 index 0000000..df33a09 --- /dev/null +++ b/src/sync_square.c @@ -0,0 +1,193 @@ +/* + An LV2 plugin to generate a non-bandlimited square waveform with gate for + trigger and sync. + 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" + +#define SYNCSQUARE_FREQUENCY 0 +#define SYNCSQUARE_GATE 1 +#define SYNCSQUARE_OUTPUT 2 + +typedef struct { + float* frequency; + float* gate; + float* output; + float srate; + float nyquist; + float phase; +} SyncSquare; + +static void +cleanup(LV2_Handle instance) +{ + free(instance); +} + +static void +connect_port(LV2_Handle instance, + uint32_t port, + void* data) +{ + SyncSquare* plugin = (SyncSquare*)instance; + + switch (port) { + case SYNCSQUARE_FREQUENCY: + plugin->frequency = data; + break; + case SYNCSQUARE_GATE: + plugin->gate = data; + break; + case SYNCSQUARE_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) +{ + SyncSquare* plugin = (SyncSquare*)malloc(sizeof(SyncSquare)); + + plugin->srate = (float)sample_rate; + plugin->nyquist = (float)(sample_rate / 2); + + return (LV2_Handle)plugin; +} + +static void +activate(LV2_Handle instance) +{ + SyncSquare* plugin = (SyncSquare*)instance; + + plugin->phase = 0.0f; +} + +static void +runSyncSquare_faga_oa(LV2_Handle instance, + uint32_t sample_count) +{ + SyncSquare* plugin = (SyncSquare*)instance; + + /* Frequency (array of float of length sample_count) */ + float* frequency = plugin->frequency; + + /* 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 nyquist = plugin->nyquist; + + float freq; + + for (uint32_t s = 0; s < sample_count; ++s) { + if (gate[s] > 0.0f) { + freq = frequency[s]; + + if (phase < nyquist) { + 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 +runSyncSquare_fcga_oa(LV2_Handle instance, + uint32_t sample_count) +{ + SyncSquare* plugin = (SyncSquare*)instance; + + /* Frequency (float value) */ + float frequency = *(plugin->frequency); + + /* 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 nyquist = plugin->nyquist; + + for (uint32_t s = 0; s < sample_count; ++s) { + if (gate[s] > 0.0f) { + if (phase < nyquist) { + 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_square", + instantiate, + connect_port, + activate, + runSyncSquare_fcga_oa, + NULL, + cleanup, + NULL, +}; + +LV2_SYMBOL_EXPORT const LV2_Descriptor* +lv2_descriptor(uint32_t index) +{ + switch (index) { + case 0: return &descriptor; + default: return NULL; + } +} |