489 lines
14 KiB
C
489 lines
14 KiB
C
/* FluidSynth - A Software Synthesizer
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*
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* Copyright (C) 2003 Peter Hanappe and others.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public License
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* as published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#include "fluid_mod.h"
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#include "fluid_chan.h"
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#include "fluid_voice.h"
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/*
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* fluid_mod_clone
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*/
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void
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fluid_mod_clone(fluid_mod_t* mod, fluid_mod_t* src)
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{
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mod->dest = src->dest;
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mod->src1 = src->src1;
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mod->flags1 = src->flags1;
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mod->src2 = src->src2;
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mod->flags2 = src->flags2;
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mod->amount = src->amount;
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}
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/**
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* Set a modulator's primary source controller and flags.
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* @param mod Modulator
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* @param src Modulator source (#fluid_mod_src or a MIDI controller number)
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* @param flags Flags determining mapping function and whether the source
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* controller is a general controller (#FLUID_MOD_GC) or a MIDI CC controller
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* (#FLUID_MOD_CC), see #fluid_mod_flags.
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*/
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void
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fluid_mod_set_source1(fluid_mod_t* mod, int src, int flags)
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{
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mod->src1 = src;
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mod->flags1 = flags;
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}
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/**
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* Set a modulator's secondary source controller and flags.
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* @param mod Modulator
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* @param src Modulator source (#fluid_mod_src or a MIDI controller number)
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* @param flags Flags determining mapping function and whether the source
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* controller is a general controller (#FLUID_MOD_GC) or a MIDI CC controller
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* (#FLUID_MOD_CC), see #fluid_mod_flags.
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*/
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void
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fluid_mod_set_source2(fluid_mod_t* mod, int src, int flags)
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{
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mod->src2 = src;
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mod->flags2 = flags;
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}
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/**
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* Set the destination effect of a modulator.
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* @param mod Modulator
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* @param dest Destination generator (#fluid_gen_type)
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*/
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void
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fluid_mod_set_dest(fluid_mod_t* mod, int dest)
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{
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mod->dest = dest;
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}
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/**
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* Set the scale amount of a modulator.
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* @param mod Modulator
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* @param amount Scale amount to assign
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*/
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void
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fluid_mod_set_amount(fluid_mod_t* mod, double amount)
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{
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mod->amount = (double) amount;
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}
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/**
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* Get the primary source value from a modulator.
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* @param mod Modulator
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* @return The primary source value (#fluid_mod_src or a MIDI CC controller value).
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*/
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int
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fluid_mod_get_source1(fluid_mod_t* mod)
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{
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return mod->src1;
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}
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/**
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* Get primary source flags from a modulator.
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* @param mod Modulator
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* @return The primary source flags (#fluid_mod_flags).
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*/
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int
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fluid_mod_get_flags1(fluid_mod_t* mod)
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{
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return mod->flags1;
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}
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/**
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* Get the secondary source value from a modulator.
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* @param mod Modulator
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* @return The secondary source value (#fluid_mod_src or a MIDI CC controller value).
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*/
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int
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fluid_mod_get_source2(fluid_mod_t* mod)
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{
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return mod->src2;
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}
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/**
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* Get secondary source flags from a modulator.
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* @param mod Modulator
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* @return The secondary source flags (#fluid_mod_flags).
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*/
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int
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fluid_mod_get_flags2(fluid_mod_t* mod)
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{
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return mod->flags2;
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}
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/**
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* Get destination effect from a modulator.
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* @param mod Modulator
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* @return Destination generator (#fluid_gen_type)
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*/
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int
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fluid_mod_get_dest(fluid_mod_t* mod)
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{
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return mod->dest;
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}
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/**
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* Get the scale amount from a modulator.
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* @param mod Modulator
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* @return Scale amount
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*/
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double
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fluid_mod_get_amount(fluid_mod_t* mod)
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{
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return (fluid_real_t) mod->amount;
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}
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/*
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* fluid_mod_get_value
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*/
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fluid_real_t
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fluid_mod_get_value(fluid_mod_t* mod, fluid_channel_t* chan, fluid_voice_t* voice)
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{
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fluid_real_t v1 = 0.0, v2 = 1.0;
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fluid_real_t range1 = 127.0, range2 = 127.0;
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if (chan == NULL) {
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return 0.0f;
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}
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/* 'special treatment' for default controller
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*
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* Reference: SF2.01 section 8.4.2
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*
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* The GM default controller 'vel-to-filter cut off' is not clearly
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* defined: If implemented according to the specs, the filter
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* frequency jumps between vel=63 and vel=64. To maintain
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* compatibility with existing sound fonts, the implementation is
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* 'hardcoded', it is impossible to implement using only one
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* modulator otherwise.
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*
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* I assume here, that the 'intention' of the paragraph is one
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* octave (1200 cents) filter frequency shift between vel=127 and
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* vel=64. 'amount' is (-2400), at least as long as the controller
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* is set to default.
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*
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* Further, the 'appearance' of the modulator (source enumerator,
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* destination enumerator, flags etc) is different from that
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* described in section 8.4.2, but it matches the definition used in
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* several SF2.1 sound fonts (where it is used only to turn it off).
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* */
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if ((mod->src2 == FLUID_MOD_VELOCITY) &&
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(mod->src1 == FLUID_MOD_VELOCITY) &&
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(mod->flags1 == (FLUID_MOD_GC | FLUID_MOD_UNIPOLAR
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| FLUID_MOD_NEGATIVE | FLUID_MOD_LINEAR)) &&
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(mod->flags2 == (FLUID_MOD_GC | FLUID_MOD_UNIPOLAR
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| FLUID_MOD_POSITIVE | FLUID_MOD_SWITCH)) &&
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(mod->dest == GEN_FILTERFC)) {
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// S. Christian Collins' mod, to stop forcing velocity based filtering
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/*
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if (voice->vel < 64){
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return (fluid_real_t) mod->amount / 2.0;
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} else {
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return (fluid_real_t) mod->amount * (127 - voice->vel) / 127;
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}
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*/
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return 0; // (fluid_real_t) mod->amount / 2.0;
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}
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// end S. Christian Collins' mod
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/* get the initial value of the first source */
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if (mod->src1 > 0) {
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if (mod->flags1 & FLUID_MOD_CC) {
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v1 = fluid_channel_get_cc(chan, mod->src1);
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} else { /* source 1 is one of the direct controllers */
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switch (mod->src1) {
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case FLUID_MOD_NONE: /* SF 2.01 8.2.1 item 0: src enum=0 => value is 1 */
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v1 = range1;
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break;
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case FLUID_MOD_VELOCITY:
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v1 = voice->vel;
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break;
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case FLUID_MOD_KEY:
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v1 = voice->key;
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break;
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case FLUID_MOD_KEYPRESSURE:
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v1 = fluid_channel_get_key_pressure (chan);
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break;
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case FLUID_MOD_CHANNELPRESSURE:
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v1 = fluid_channel_get_channel_pressure (chan);
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break;
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case FLUID_MOD_PITCHWHEEL:
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v1 = fluid_channel_get_pitch_bend (chan);
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range1 = 0x4000;
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break;
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case FLUID_MOD_PITCHWHEELSENS:
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v1 = fluid_channel_get_pitch_wheel_sensitivity (chan);
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break;
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default:
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v1 = 0.0;
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}
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}
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/* transform the input value */
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switch (mod->flags1 & 0x0f) {
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case 0: /* linear, unipolar, positive */
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v1 /= range1;
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break;
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case 1: /* linear, unipolar, negative */
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v1 = 1.0f - v1 / range1;
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break;
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case 2: /* linear, bipolar, positive */
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v1 = -1.0f + 2.0f * v1 / range1;
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break;
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case 3: /* linear, bipolar, negative */
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v1 = 1.0f - 2.0f * v1 / range1;
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break;
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case 4: /* concave, unipolar, positive */
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v1 = fluid_concave(v1);
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break;
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case 5: /* concave, unipolar, negative */
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v1 = fluid_concave(127 - v1);
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break;
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case 6: /* concave, bipolar, positive */
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v1 = (v1 > 64)? fluid_concave(2 * (v1 - 64)) : -fluid_concave(2 * (64 - v1));
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break;
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case 7: /* concave, bipolar, negative */
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v1 = (v1 > 64)? -fluid_concave(2 * (v1 - 64)) : fluid_concave(2 * (64 - v1));
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break;
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case 8: /* convex, unipolar, positive */
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v1 = fluid_convex(v1);
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break;
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case 9: /* convex, unipolar, negative */
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v1 = fluid_convex(127 - v1);
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break;
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case 10: /* convex, bipolar, positive */
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v1 = (v1 > 64)? fluid_convex(2 * (v1 - 64)) : -fluid_convex(2 * (64 - v1));
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break;
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case 11: /* convex, bipolar, negative */
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v1 = (v1 > 64)? -fluid_convex(2 * (v1 - 64)) : fluid_convex(2 * (64 - v1));
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break;
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case 12: /* switch, unipolar, positive */
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v1 = (v1 >= 64)? 1.0f : 0.0f;
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break;
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case 13: /* switch, unipolar, negative */
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v1 = (v1 >= 64)? 0.0f : 1.0f;
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break;
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case 14: /* switch, bipolar, positive */
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v1 = (v1 >= 64)? 1.0f : -1.0f;
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break;
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case 15: /* switch, bipolar, negative */
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v1 = (v1 >= 64)? -1.0f : 1.0f;
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break;
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}
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} else {
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return 0.0;
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}
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/* no need to go further */
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if (v1 == 0.0f) {
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return 0.0f;
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}
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/* get the second input source */
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if (mod->src2 > 0) {
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if (mod->flags2 & FLUID_MOD_CC) {
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v2 = fluid_channel_get_cc(chan, mod->src2);
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} else {
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switch (mod->src2) {
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case FLUID_MOD_NONE: /* SF 2.01 8.2.1 item 0: src enum=0 => value is 1 */
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v2 = range2;
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break;
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case FLUID_MOD_VELOCITY:
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v2 = voice->vel;
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break;
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case FLUID_MOD_KEY:
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v2 = voice->key;
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break;
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case FLUID_MOD_KEYPRESSURE:
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v2 = fluid_channel_get_key_pressure (chan);
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break;
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case FLUID_MOD_CHANNELPRESSURE:
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v2 = fluid_channel_get_channel_pressure (chan);
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break;
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case FLUID_MOD_PITCHWHEEL:
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v2 = fluid_channel_get_pitch_bend (chan);
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break;
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case FLUID_MOD_PITCHWHEELSENS:
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v2 = fluid_channel_get_pitch_wheel_sensitivity (chan);
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break;
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default:
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v1 = 0.0f;
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}
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}
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/* transform the second input value */
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switch (mod->flags2 & 0x0f) {
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case 0: /* linear, unipolar, positive */
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v2 /= range2;
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break;
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case 1: /* linear, unipolar, negative */
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v2 = 1.0f - v2 / range2;
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break;
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case 2: /* linear, bipolar, positive */
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v2 = -1.0f + 2.0f * v2 / range2;
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break;
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case 3: /* linear, bipolar, negative */
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v2 = -1.0f + 2.0f * v2 / range2;
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break;
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case 4: /* concave, unipolar, positive */
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v2 = fluid_concave(v2);
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break;
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case 5: /* concave, unipolar, negative */
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v2 = fluid_concave(127 - v2);
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break;
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case 6: /* concave, bipolar, positive */
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v2 = (v2 > 64)? fluid_concave(2 * (v2 - 64)) : -fluid_concave(2 * (64 - v2));
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break;
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case 7: /* concave, bipolar, negative */
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v2 = (v2 > 64)? -fluid_concave(2 * (v2 - 64)) : fluid_concave(2 * (64 - v2));
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break;
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case 8: /* convex, unipolar, positive */
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v2 = fluid_convex(v2);
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break;
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case 9: /* convex, unipolar, negative */
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v2 = 1.0f - fluid_convex(v2);
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break;
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case 10: /* convex, bipolar, positive */
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v2 = (v2 > 64)? -fluid_convex(2 * (v2 - 64)) : fluid_convex(2 * (64 - v2));
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break;
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case 11: /* convex, bipolar, negative */
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v2 = (v2 > 64)? -fluid_convex(2 * (v2 - 64)) : fluid_convex(2 * (64 - v2));
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break;
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case 12: /* switch, unipolar, positive */
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v2 = (v2 >= 64)? 1.0f : 0.0f;
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break;
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case 13: /* switch, unipolar, negative */
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v2 = (v2 >= 64)? 0.0f : 1.0f;
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break;
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case 14: /* switch, bipolar, positive */
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v2 = (v2 >= 64)? 1.0f : -1.0f;
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break;
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case 15: /* switch, bipolar, negative */
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v2 = (v2 >= 64)? -1.0f : 1.0f;
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break;
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}
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} else {
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v2 = 1.0f;
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}
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/* it's as simple as that: */
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return (fluid_real_t) mod->amount * v1 * v2;
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}
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/**
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* Create a new uninitialized modulator structure.
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* @return New allocated modulator or NULL if out of memory
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*/
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fluid_mod_t*
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fluid_mod_new()
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{
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fluid_mod_t* mod = FLUID_NEW (fluid_mod_t);
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if (mod == NULL) {
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FLUID_LOG(FLUID_ERR, "Out of memory");
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return NULL;
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}
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return mod;
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}
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/**
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* Free a modulator structure.
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* @param mod Modulator to free
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*/
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void
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fluid_mod_delete (fluid_mod_t *mod)
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{
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FLUID_FREE(mod);
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}
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/**
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* Checks if two modulators are identical in sources, flags and destination.
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* @param mod1 First modulator
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* @param mod2 Second modulator
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* @return TRUE if identical, FALSE otherwise
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*
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* SF2.01 section 9.5.1 page 69, 'bullet' 3 defines 'identical'.
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*/
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int
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fluid_mod_test_identity (fluid_mod_t *mod1, fluid_mod_t *mod2)
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{
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return mod1->dest == mod2->dest
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&& mod1->src1 == mod2->src1
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&& mod1->src2 == mod2->src2
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&& mod1->flags1 == mod2->flags1
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&& mod1->flags2 == mod2->flags2;
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}
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/* debug function: Prints the contents of a modulator */
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void fluid_dump_modulator(fluid_mod_t * mod){
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int src1=mod->src1;
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int dest=mod->dest;
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int src2=mod->src2;
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int flags1=mod->flags1;
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int flags2=mod->flags2;
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fluid_real_t amount=(fluid_real_t)mod->amount;
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printf("Src: ");
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if (flags1 & FLUID_MOD_CC){
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printf("MIDI CC=%i",src1);
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} else {
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switch(src1){
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case FLUID_MOD_NONE:
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printf("None"); break;
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case FLUID_MOD_VELOCITY:
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printf("note-on velocity"); break;
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case FLUID_MOD_KEY:
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printf("Key nr"); break;
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case FLUID_MOD_KEYPRESSURE:
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printf("Poly pressure"); break;
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case FLUID_MOD_CHANNELPRESSURE:
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printf("Chan pressure"); break;
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case FLUID_MOD_PITCHWHEEL:
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printf("Pitch Wheel"); break;
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case FLUID_MOD_PITCHWHEELSENS:
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printf("Pitch Wheel sens"); break;
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default:
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printf("(unknown: %i)", src1);
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}; /* switch src1 */
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}; /* if not CC */
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if (flags1 & FLUID_MOD_NEGATIVE){printf("- ");} else {printf("+ ");};
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if (flags1 & FLUID_MOD_BIPOLAR){printf("bip ");} else {printf("unip ");};
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printf("-> ");
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switch(dest){
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case GEN_FILTERQ: printf("Q"); break;
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case GEN_FILTERFC: printf("fc"); break;
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case GEN_VIBLFOTOPITCH: printf("VibLFO-to-pitch"); break;
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case GEN_MODENVTOPITCH: printf("ModEnv-to-pitch"); break;
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case GEN_MODLFOTOPITCH: printf("ModLFO-to-pitch"); break;
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case GEN_CHORUSSEND: printf("Chorus send"); break;
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case GEN_REVERBSEND: printf("Reverb send"); break;
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case GEN_PAN: printf("pan"); break;
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case GEN_ATTENUATION: printf("att"); break;
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default: printf("dest %i",dest);
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}; /* switch dest */
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printf(", amount %f flags %i src2 %i flags2 %i\n",amount, flags1, src2, flags2);
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};
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