/* 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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); } }