From 1ad3c632e91211ae84bc738eebd8d4a8318707c9 Mon Sep 17 00:00:00 2001 From: David Robillard Date: Fri, 9 Jun 2006 14:34:20 +0000 Subject: Added omins git-svn-id: http://svn.drobilla.net/lad/omins@8 a436a847-0d15-0410-975c-d299462d15a1 --- src/slew_limiter_2743.c | 272 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 272 insertions(+) create mode 100644 src/slew_limiter_2743.c (limited to 'src/slew_limiter_2743.c') diff --git a/src/slew_limiter_2743.c b/src/slew_limiter_2743.c new file mode 100644 index 0000000..dd486b5 --- /dev/null +++ b/src/slew_limiter_2743.c @@ -0,0 +1,272 @@ +/* slew_limiter - A LADSPA plugin that limits the rate of change of a + * signal. Increases and decreases in the signal can be + * limited separately. + * + * Copyright (C) 2005 Lars Luthman + * LADSPA skeleton code taken from dahdsr_fexp.c by Loki Davison + * + * This plugin 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 2 of the License, or (at your option) + * any later version. + * + * This plugin 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 + * details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#define _XOPEN_SOURCE 500 /* strdup */ +#include +#include +#include + +/* This defines the number of "variants", i.e. the number of separate plugins + in this file */ +#define SLIM_VARIANT_COUNT 2 + +/* These are the port numbers */ +#define SLIM_INPUT 0 +#define SLIM_MAXRISE 1 +#define SLIM_MAXFALL 2 +#define SLIM_OUTPUT 3 + + +/* This is an array pointer to the descriptors of the different variants */ +LADSPA_Descriptor** slim_descriptors = 0; + + +/* This is the data for a single instance of the plugin */ +typedef struct +{ + LADSPA_Data* input; + LADSPA_Data* maxrise; + LADSPA_Data* maxfall; + LADSPA_Data* reset; + LADSPA_Data* output; + LADSPA_Data srate; + LADSPA_Data last_output; +} +SLim; + + + +/* LADSPA hosts use this function to get the plugin descriptors */ +const LADSPA_Descriptor* ladspa_descriptor(unsigned long index) +{ + if (index < SLIM_VARIANT_COUNT) + return slim_descriptors[index]; + return 0; +} + + +/* Clean up after a plugin instance */ +void cleanupSLim (LADSPA_Handle instance) +{ + free(instance); +} + + +/* This is called when the hosts connects a port to a buffer */ +void connectPortSLim(LADSPA_Handle instance, + unsigned long port, LADSPA_Data* data) +{ + SLim* plugin = (SLim *)instance; + + switch (port) { + case SLIM_INPUT: + plugin->input = data; + break; + case SLIM_MAXRISE: + plugin->maxrise = data; + break; + case SLIM_MAXFALL: + plugin->maxfall = data; + break; + case SLIM_OUTPUT: + plugin->output = data; + break; + } +} + + +/* The host uses this function to create an instance of a plugin */ +LADSPA_Handle instantiateSLim(const LADSPA_Descriptor * descriptor, + unsigned long sample_rate) +{ + SLim* plugin = (SLim*)calloc(1, sizeof(SLim)); + plugin->srate = (LADSPA_Data)sample_rate; + return (LADSPA_Handle)plugin; +} + + +/* This is called before the hosts starts to use the plugin instance */ +void activateSLim(LADSPA_Handle instance) +{ + SLim* plugin = (SLim*)instance; + plugin->last_output = 0; +} + + +/* The run function! */ +void runSLim(LADSPA_Handle instance, unsigned long sample_count, int variant) +{ + SLim* plugin = (SLim*)instance; + + if (plugin->input && plugin->output) { + unsigned long i; + LADSPA_Data maxrise, maxfall; + for (i = 0; i < sample_count; ++i) { + + if (plugin->maxrise && variant == 0) + maxrise = plugin->maxrise[i]; + else if (plugin->maxrise && variant == 1) + maxrise = plugin->maxrise[0]; + else + maxrise = 0; + + if (plugin->maxfall && variant == 0) + maxfall = plugin->maxfall[i]; + else if (plugin->maxfall && variant == 1) + maxfall = plugin->maxfall[0]; + else + maxfall = 0; + + LADSPA_Data maxinc = maxrise / plugin->srate; + LADSPA_Data maxdec = maxfall / plugin->srate; + LADSPA_Data increment = plugin->input[i] - plugin->last_output; + if (increment > maxinc) + increment = maxinc; + else if (increment < -maxdec) + increment = -maxdec; + + plugin->output[i] = plugin->last_output + increment; + plugin->last_output = plugin->output[i]; + } + } +} + + +void runSLim_audio(LADSPA_Handle instance, unsigned long sample_count) +{ + runSLim(instance, sample_count, 0); +} + + +void runSLim_control(LADSPA_Handle instance, unsigned long sample_count) +{ + runSLim(instance, sample_count, 1); +} + + +/* Called automagically by the dynamic linker - set up global stuff here */ +void _init(void) +{ + static const unsigned long ids[] = { 2743, 2744 }; + static const char * labels[] = { "slew_limiter_ra", "slew_limiter_rc" }; + static const char * names[] = { "Slew limiter (RA)", "Slew limiter (RC)" }; + + char** port_names; + LADSPA_PortDescriptor* port_descriptors; + LADSPA_PortRangeHint* port_range_hints; + LADSPA_Descriptor* descriptor; + + LADSPA_PortDescriptor input_port_descriptors[] = + { LADSPA_PORT_INPUT | LADSPA_PORT_AUDIO, + LADSPA_PORT_INPUT | LADSPA_PORT_AUDIO }; + LADSPA_PortDescriptor maxrise_port_descriptors[] = + { LADSPA_PORT_INPUT | LADSPA_PORT_AUDIO, + LADSPA_PORT_INPUT | LADSPA_PORT_CONTROL }; + LADSPA_PortDescriptor maxfall_port_descriptors[] = + { LADSPA_PORT_INPUT | LADSPA_PORT_AUDIO, + LADSPA_PORT_INPUT | LADSPA_PORT_CONTROL }; + LADSPA_PortDescriptor output_port_descriptors[] = + { LADSPA_PORT_OUTPUT | LADSPA_PORT_AUDIO, + LADSPA_PORT_OUTPUT | LADSPA_PORT_AUDIO }; + + void (*run_functions[]) (LADSPA_Handle, unsigned long) = { runSLim_audio, + runSLim_control }; + + slim_descriptors = (LADSPA_Descriptor**)calloc(SLIM_VARIANT_COUNT, + sizeof(LADSPA_Descriptor)); + + if (slim_descriptors) { + int i; + for (i = 0; i < SLIM_VARIANT_COUNT; ++i) { + slim_descriptors[i] = + (LADSPA_Descriptor*)malloc(sizeof(LADSPA_Descriptor)); + descriptor = slim_descriptors[i]; + if (descriptor) { + descriptor->UniqueID = ids[i]; + descriptor->Label = labels[i]; + descriptor->Properties = LADSPA_PROPERTY_HARD_RT_CAPABLE; + descriptor->Name = names[i]; + descriptor->Maker = "Lars Luthman "; + descriptor->Copyright = "GPL"; + descriptor->PortCount = 4; + + port_descriptors = + (LADSPA_PortDescriptor*)calloc(4, sizeof(LADSPA_PortDescriptor)); + descriptor->PortDescriptors = + (const LADSPA_PortDescriptor*)port_descriptors; + port_range_hints = + (LADSPA_PortRangeHint*)calloc(4, sizeof(LADSPA_PortRangeHint)); + descriptor->PortRangeHints = + (const LADSPA_PortRangeHint*)port_range_hints; + + port_names = (char**)calloc(9, sizeof (char*)); + descriptor->PortNames = (const char**)port_names; + + /* Parameters for Input */ + port_descriptors[SLIM_INPUT] = input_port_descriptors[i]; + port_names[SLIM_INPUT] = "Input"; + + /* Parameters for Rise rate */ + port_descriptors[SLIM_MAXRISE] = maxrise_port_descriptors[i]; + port_names[SLIM_MAXRISE] = "Rise rate (1/s)"; + + /* Parameters for Fall rate */ + port_descriptors[SLIM_MAXFALL] = maxfall_port_descriptors[i]; + port_names[SLIM_MAXFALL] = "Fall rate (1/s)"; + + /* Parameters for Output*/ + port_descriptors[SLIM_OUTPUT] = output_port_descriptors[i]; + port_names[SLIM_OUTPUT] = "Output"; + + descriptor->activate = activateSLim; + descriptor->cleanup = cleanupSLim; + descriptor->connect_port = connectPortSLim; + descriptor->deactivate = NULL; + descriptor->instantiate = instantiateSLim; + descriptor->run = run_functions[i]; + descriptor->run_adding = NULL; + descriptor->set_run_adding_gain = NULL; + } + } + } +} + + +/* Called automagically by the dynamic linker - free global stuff here */ +void _fini(void) +{ + LADSPA_Descriptor* descriptor; + int i; + + if (slim_descriptors) { + for (i = 0; i < SLIM_VARIANT_COUNT; i++) { + descriptor = slim_descriptors[i]; + if (descriptor) { + free((LADSPA_PortDescriptor*)descriptor->PortDescriptors); + free((char**)descriptor->PortNames); + free((LADSPA_PortRangeHint*)descriptor->PortRangeHints); + free(descriptor); + } + } + free(slim_descriptors); + } +} -- cgit v1.2.1