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Diffstat (limited to 'src/difference.c')
| -rw-r--r-- | src/difference.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/src/difference.c b/src/difference.c new file mode 100644 index 0000000..afa9183 --- /dev/null +++ b/src/difference.c @@ -0,0 +1,180 @@ +/* + An LV2 plugin to calculate the difference of two signals. + Copyright 2011 David Robillard + Copyright 2004 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 DIFFERENCE_INPUT 0 +#define DIFFERENCE_MINUS 1 +#define DIFFERENCE_OUTPUT 2 + +typedef struct { + float* input; + float* minus; + float* output; +} Difference; + +static void +cleanup(LV2_Handle instance) +{ + free(instance); +} + +static void +connect_port(LV2_Handle instance, + uint32_t port, + void* data) +{ + Difference* plugin = (Difference*)instance; + + switch (port) { + case DIFFERENCE_INPUT: + plugin->input = data; + break; + case DIFFERENCE_MINUS: + plugin->minus = data; + break; + case DIFFERENCE_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) +{ + Difference* plugin = (Difference*)malloc(sizeof(Difference)); + + return (LV2_Handle)plugin; +} + +static void +runDifference_iama_oa(LV2_Handle instance, + uint32_t sample_count) +{ + Difference* plugin = (Difference*)instance; + + /* Input (array of floats of length sample_count) */ + float* input = plugin->input; + + /* Input to Subtract (array of floats of length sample_count) */ + float* minus = plugin->minus; + + /* Output (array of floats of length sample_count) */ + float* output = plugin->output; + + float in; + float mi; + + for (uint32_t s = 0; s < sample_count; ++s) { + in = input[s]; + mi = minus[s]; + + output[s] = in - mi; + } +} + +static void +runDifference_iamc_oa(LV2_Handle instance, + uint32_t sample_count) +{ + Difference* plugin = (Difference*)instance; + + /* Input (array of floats of length sample_count) */ + float* input = plugin->input; + + /* Input to Subtract (float value) */ + float minus = *(plugin->minus); + + /* Output (array of floats of length sample_count) */ + float* output = plugin->output; + + float in; + + for (uint32_t s = 0; s < sample_count; ++s) { + in = input[s]; + + output[s] = in - minus; + } +} + +static void +runDifference_icma_oa(LV2_Handle instance, + uint32_t sample_count) +{ + Difference* plugin = (Difference*)instance; + + /* Input (float value) */ + float input = *(plugin->input); + + /* Input to Subtract (array of floats of length sample_count) */ + float* minus = plugin->minus; + + /* Output (array of floats of length sample_count) */ + float* output = plugin->output; + + float mi; + + for (uint32_t s = 0; s < sample_count; ++s) { + mi = minus[s]; + + output[s] = input - mi; + } +} + +static void +runDifference_icmc_oc(LV2_Handle instance, + uint32_t sample_count) +{ + Difference* plugin = (Difference*)instance; + + /* Input (float value) */ + float input = *(plugin->input); + + /* Input to Subtract (float value) */ + float minus = *(plugin->minus); + + /* Output Frequency (pointer to float value) */ + float* output = plugin->output; + + output[0] = input - minus; +} + +static const LV2_Descriptor descriptor = { + "http://drobilla.net/plugins/blip/difference", + instantiate, + connect_port, + NULL, + runDifference_icmc_oc, + NULL, + cleanup, + NULL, +}; + +LV2_SYMBOL_EXPORT const LV2_Descriptor* +lv2_descriptor(uint32_t index) +{ + switch (index) { + case 0: return &descriptor; + default: return NULL; + } +} |