/* Crossfade with AR Level plugin. Copyright (C) 2005 Thorsten Wilms. * Based on Dave Robillard's "Hz to AMS style V/Oct" plugin for the skeleton. * Thanks to Florian Schmidt for explaining how to calculate the scale values * before I could work it out myself! ;-) * * 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 "ladspa.h" #define XFADE_LEVEL_ID 4410 #define XFADE_NUM_PORTS 4 /* Port Numbers */ #define XFADE_LEVEL 0 #define XFADE_A 1 #define XFADE_B 2 #define XFADE_OUTPUT 3 /* All state information for plugin */ typedef struct { /* Ports */ LADSPA_Data *level_buffer; LADSPA_Data *a_buffer; LADSPA_Data *b_buffer; LADSPA_Data *output_buffer; } XFADE; /* Construct a new plugin instance */ LADSPA_Handle XFADE_instantiate(const LADSPA_Descriptor * descriptor, unsigned long srate) { return (LADSPA_Handle)malloc(sizeof(XFADE)); } /* Connect a port to a data location */ void XFADE_connect_port(LADSPA_Handle instance, unsigned long port, LADSPA_Data * location) { XFADE* plugin; plugin = (XFADE*) instance; switch (port) { case XFADE_LEVEL: plugin->level_buffer = location; break; case XFADE_A: plugin->a_buffer = location; break; case XFADE_B: plugin->b_buffer = location; break; case XFADE_OUTPUT: plugin->output_buffer = location; break; } } void XFADE_run_ar(LADSPA_Handle instance, unsigned long nframes) { LADSPA_Data* level; LADSPA_Data* a; LADSPA_Data* b; LADSPA_Data* output; XFADE* plugin; unsigned long i; float l; plugin = (XFADE*)instance; level = plugin->level_buffer; a = plugin->a_buffer; b = plugin->b_buffer; output = plugin->output_buffer; for (i = 0; i < nframes; i++) { /* transfer multiplication value to 0 to 1 range */ if (level[i] < -1) { l = 0; } else if (level[i] > 1) { l = 1; } else { l = (level[i] + 1) / 2; } output[i] = a[i] * l + b[i] * (1 - l); } } void XFADE_cleanup(LADSPA_Handle instance) { free(instance); } LADSPA_Descriptor *xfade_descriptor = NULL; /* Called automatically when the plugin library is first loaded. */ void _init() { char **port_names; LADSPA_PortDescriptor *port_descriptors; LADSPA_PortRangeHint *port_range_hints; xfade_descriptor = (LADSPA_Descriptor *) malloc(sizeof(LADSPA_Descriptor)); if (xfade_descriptor) { xfade_descriptor->UniqueID = XFADE_LEVEL_ID; xfade_descriptor->Label = strdup("fast_xfade"); xfade_descriptor->Properties = LADSPA_PROPERTY_HARD_RT_CAPABLE; xfade_descriptor->Name = strdup("Fast Crossfade"); xfade_descriptor->Maker = strdup("Thorsten Wilms"); xfade_descriptor->Copyright = strdup("GPL"); xfade_descriptor->PortCount = XFADE_NUM_PORTS; port_descriptors = (LADSPA_PortDescriptor *) calloc(XFADE_NUM_PORTS, sizeof(LADSPA_PortDescriptor)); xfade_descriptor->PortDescriptors = (const LADSPA_PortDescriptor *)port_descriptors; port_descriptors[XFADE_LEVEL] = LADSPA_PORT_INPUT | LADSPA_PORT_AUDIO; port_descriptors[XFADE_A] = LADSPA_PORT_INPUT | LADSPA_PORT_AUDIO; port_descriptors[XFADE_B] = LADSPA_PORT_INPUT | LADSPA_PORT_AUDIO; port_descriptors[XFADE_OUTPUT] = LADSPA_PORT_OUTPUT | LADSPA_PORT_AUDIO; port_names = (char **)calloc(XFADE_NUM_PORTS, sizeof(char *)); xfade_descriptor->PortNames = (const char **)port_names; port_names[XFADE_LEVEL] = strdup("Level"); port_names[XFADE_A] = strdup("A"); port_names[XFADE_B] = strdup("B"); port_names[XFADE_OUTPUT] = strdup("Output"); port_range_hints = ((LADSPA_PortRangeHint *) calloc(XFADE_NUM_PORTS, sizeof(LADSPA_PortRangeHint))); xfade_descriptor->PortRangeHints = (const LADSPA_PortRangeHint *)port_range_hints; port_range_hints[XFADE_LEVEL].HintDescriptor = 0; port_range_hints[XFADE_A].HintDescriptor = 0; port_range_hints[XFADE_B].HintDescriptor = 0; port_range_hints[XFADE_OUTPUT].HintDescriptor = 0; xfade_descriptor->instantiate = XFADE_instantiate; xfade_descriptor->connect_port = XFADE_connect_port; xfade_descriptor->activate = NULL; xfade_descriptor->run = XFADE_run_ar; xfade_descriptor->run_adding = NULL; xfade_descriptor->set_run_adding_gain = NULL; xfade_descriptor->deactivate = NULL; xfade_descriptor->cleanup = XFADE_cleanup; } } void XFADE_delete_descriptors(LADSPA_Descriptor * psdescriptors) { unsigned long lIndex; if (psdescriptors) { free((char *)psdescriptors->Label); free((char *)psdescriptors->Name); free((char *)psdescriptors->Maker); free((char *)psdescriptors->Copyright); free((LADSPA_PortDescriptor *) psdescriptors->PortDescriptors); for (lIndex = 0; lIndex < psdescriptors->PortCount; lIndex++) free((char *)(psdescriptors->PortNames[lIndex])); free((char **)psdescriptors->PortNames); free((LADSPA_PortRangeHint *) psdescriptors->PortRangeHints); free(psdescriptors); } } /* Called automatically when the library is unloaded. */ void _fini() { XFADE_delete_descriptors(xfade_descriptor); } /* Return a descriptor of the requested plugin type. */ const LADSPA_Descriptor * ladspa_descriptor(unsigned long index) { if (index == 0) return xfade_descriptor; return 0; }