fluid_mod.c
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上传日期:2020-08-17
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文件大小:13k
- /* FluidSynth - A Software Synthesizer
- *
- * Copyright (C) 2003 Peter Hanappe and others.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public License
- * as published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This library 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
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the Free
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- * 02111-1307, USA
- */
- #include "fluid_mod.h"
- #include "fluid_chan.h"
- #include "fluid_voice.h"
- /*
- * fluid_mod_clone
- */
- void
- fluid_mod_clone(fluid_mod_t* mod, fluid_mod_t* src)
- {
- mod->dest = src->dest;
- mod->src1 = src->src1;
- mod->flags1 = src->flags1;
- mod->src2 = src->src2;
- mod->flags2 = src->flags2;
- mod->amount = src->amount;
- }
- /**
- * Set a modulator's primary source controller and flags.
- * @param mod Modulator
- * @param src Modulator source (#fluid_mod_src or a MIDI controller number)
- * @param flags Flags determining mapping function and whether the source
- * controller is a general controller (#FLUID_MOD_GC) or a MIDI CC controller
- * (#FLUID_MOD_CC), see #fluid_mod_flags.
- */
- void
- fluid_mod_set_source1(fluid_mod_t* mod, int src, int flags)
- {
- mod->src1 = src;
- mod->flags1 = flags;
- }
- /**
- * Set a modulator's secondary source controller and flags.
- * @param mod Modulator
- * @param src Modulator source (#fluid_mod_src or a MIDI controller number)
- * @param flags Flags determining mapping function and whether the source
- * controller is a general controller (#FLUID_MOD_GC) or a MIDI CC controller
- * (#FLUID_MOD_CC), see #fluid_mod_flags.
- */
- void
- fluid_mod_set_source2(fluid_mod_t* mod, int src, int flags)
- {
- mod->src2 = src;
- mod->flags2 = flags;
- }
- /**
- * Set the destination effect of a modulator.
- * @param mod Modulator
- * @param dest Destination generator (#fluid_gen_type)
- */
- void
- fluid_mod_set_dest(fluid_mod_t* mod, int dest)
- {
- mod->dest = dest;
- }
- /**
- * Set the scale amount of a modulator.
- * @param mod Modulator
- * @param amount Scale amount to assign
- */
- void
- fluid_mod_set_amount(fluid_mod_t* mod, double amount)
- {
- mod->amount = (double) amount;
- }
- /**
- * Get the primary source value from a modulator.
- * @param mod Modulator
- * @return The primary source value (#fluid_mod_src or a MIDI CC controller value).
- */
- int
- fluid_mod_get_source1(fluid_mod_t* mod)
- {
- return mod->src1;
- }
- /**
- * Get primary source flags from a modulator.
- * @param mod Modulator
- * @return The primary source flags (#fluid_mod_flags).
- */
- int
- fluid_mod_get_flags1(fluid_mod_t* mod)
- {
- return mod->flags1;
- }
- /**
- * Get the secondary source value from a modulator.
- * @param mod Modulator
- * @return The secondary source value (#fluid_mod_src or a MIDI CC controller value).
- */
- int
- fluid_mod_get_source2(fluid_mod_t* mod)
- {
- return mod->src2;
- }
- /**
- * Get secondary source flags from a modulator.
- * @param mod Modulator
- * @return The secondary source flags (#fluid_mod_flags).
- */
- int
- fluid_mod_get_flags2(fluid_mod_t* mod)
- {
- return mod->flags2;
- }
- /**
- * Get destination effect from a modulator.
- * @param mod Modulator
- * @return Destination generator (#fluid_gen_type)
- */
- int
- fluid_mod_get_dest(fluid_mod_t* mod)
- {
- return mod->dest;
- }
- /**
- * Get the scale amount from a modulator.
- * @param mod Modulator
- * @return Scale amount
- */
- double
- fluid_mod_get_amount(fluid_mod_t* mod)
- {
- return (fluid_real_t) mod->amount;
- }
- /*
- * fluid_mod_get_value
- */
- fluid_real_t
- fluid_mod_get_value(fluid_mod_t* mod, fluid_channel_t* chan, fluid_voice_t* voice)
- {
- fluid_real_t v1 = 0.0, v2 = 1.0;
- fluid_real_t range1 = 127.0, range2 = 127.0;
- if (chan == NULL) {
- return 0.0f;
- }
- /* 'special treatment' for default controller
- *
- * Reference: SF2.01 section 8.4.2
- *
- * The GM default controller 'vel-to-filter cut off' is not clearly
- * defined: If implemented according to the specs, the filter
- * frequency jumps between vel=63 and vel=64. To maintain
- * compatibility with existing sound fonts, the implementation is
- * 'hardcoded', it is impossible to implement using only one
- * modulator otherwise.
- *
- * I assume here, that the 'intention' of the paragraph is one
- * octave (1200 cents) filter frequency shift between vel=127 and
- * vel=64. 'amount' is (-2400), at least as long as the controller
- * is set to default.
- *
- * Further, the 'appearance' of the modulator (source enumerator,
- * destination enumerator, flags etc) is different from that
- * described in section 8.4.2, but it matches the definition used in
- * several SF2.1 sound fonts (where it is used only to turn it off).
- * */
- if ((mod->src2 == FLUID_MOD_VELOCITY) &&
- (mod->src1 == FLUID_MOD_VELOCITY) &&
- (mod->flags1 == (FLUID_MOD_GC | FLUID_MOD_UNIPOLAR
- | FLUID_MOD_NEGATIVE | FLUID_MOD_LINEAR)) &&
- (mod->flags2 == (FLUID_MOD_GC | FLUID_MOD_UNIPOLAR
- | FLUID_MOD_POSITIVE | FLUID_MOD_SWITCH)) &&
- (mod->dest == GEN_FILTERFC)) {
- // S. Christian Collins' mod, to stop forcing velocity based filtering
- /*
- if (voice->vel < 64){
- return (fluid_real_t) mod->amount / 2.0;
- } else {
- return (fluid_real_t) mod->amount * (127 - voice->vel) / 127;
- }
- */
- return 0; // (fluid_real_t) mod->amount / 2.0;
- }
- // end S. Christian Collins' mod
- /* get the initial value of the first source */
- if (mod->src1 > 0) {
- if (mod->flags1 & FLUID_MOD_CC) {
- v1 = fluid_channel_get_cc(chan, mod->src1);
- } else { /* source 1 is one of the direct controllers */
- switch (mod->src1) {
- case FLUID_MOD_NONE: /* SF 2.01 8.2.1 item 0: src enum=0 => value is 1 */
- v1 = range1;
- break;
- case FLUID_MOD_VELOCITY:
- v1 = voice->vel;
- break;
- case FLUID_MOD_KEY:
- v1 = voice->key;
- break;
- case FLUID_MOD_KEYPRESSURE:
- v1 = fluid_channel_get_key_pressure (chan);
- break;
- case FLUID_MOD_CHANNELPRESSURE:
- v1 = fluid_channel_get_channel_pressure (chan);
- break;
- case FLUID_MOD_PITCHWHEEL:
- v1 = fluid_channel_get_pitch_bend (chan);
- range1 = 0x4000;
- break;
- case FLUID_MOD_PITCHWHEELSENS:
- v1 = fluid_channel_get_pitch_wheel_sensitivity (chan);
- break;
- default:
- v1 = 0.0;
- }
- }
- /* transform the input value */
- switch (mod->flags1 & 0x0f) {
- case 0: /* linear, unipolar, positive */
- v1 /= range1;
- break;
- case 1: /* linear, unipolar, negative */
- v1 = 1.0f - v1 / range1;
- break;
- case 2: /* linear, bipolar, positive */
- v1 = -1.0f + 2.0f * v1 / range1;
- break;
- case 3: /* linear, bipolar, negative */
- v1 = 1.0f - 2.0f * v1 / range1;
- break;
- case 4: /* concave, unipolar, positive */
- v1 = fluid_concave(v1);
- break;
- case 5: /* concave, unipolar, negative */
- v1 = fluid_concave(127 - v1);
- break;
- case 6: /* concave, bipolar, positive */
- v1 = (v1 > 64)? fluid_concave(2 * (v1 - 64)) : -fluid_concave(2 * (64 - v1));
- break;
- case 7: /* concave, bipolar, negative */
- v1 = (v1 > 64)? -fluid_concave(2 * (v1 - 64)) : fluid_concave(2 * (64 - v1));
- break;
- case 8: /* convex, unipolar, positive */
- v1 = fluid_convex(v1);
- break;
- case 9: /* convex, unipolar, negative */
- v1 = fluid_convex(127 - v1);
- break;
- case 10: /* convex, bipolar, positive */
- v1 = (v1 > 64)? fluid_convex(2 * (v1 - 64)) : -fluid_convex(2 * (64 - v1));
- break;
- case 11: /* convex, bipolar, negative */
- v1 = (v1 > 64)? -fluid_convex(2 * (v1 - 64)) : fluid_convex(2 * (64 - v1));
- break;
- case 12: /* switch, unipolar, positive */
- v1 = (v1 >= 64)? 1.0f : 0.0f;
- break;
- case 13: /* switch, unipolar, negative */
- v1 = (v1 >= 64)? 0.0f : 1.0f;
- break;
- case 14: /* switch, bipolar, positive */
- v1 = (v1 >= 64)? 1.0f : -1.0f;
- break;
- case 15: /* switch, bipolar, negative */
- v1 = (v1 >= 64)? -1.0f : 1.0f;
- break;
- }
- } else {
- return 0.0;
- }
- /* no need to go further */
- if (v1 == 0.0f) {
- return 0.0f;
- }
- /* get the second input source */
- if (mod->src2 > 0) {
- if (mod->flags2 & FLUID_MOD_CC) {
- v2 = fluid_channel_get_cc(chan, mod->src2);
- } else {
- switch (mod->src2) {
- case FLUID_MOD_NONE: /* SF 2.01 8.2.1 item 0: src enum=0 => value is 1 */
- v2 = range2;
- break;
- case FLUID_MOD_VELOCITY:
- v2 = voice->vel;
- break;
- case FLUID_MOD_KEY:
- v2 = voice->key;
- break;
- case FLUID_MOD_KEYPRESSURE:
- v2 = fluid_channel_get_key_pressure (chan);
- break;
- case FLUID_MOD_CHANNELPRESSURE:
- v2 = fluid_channel_get_channel_pressure (chan);
- break;
- case FLUID_MOD_PITCHWHEEL:
- v2 = fluid_channel_get_pitch_bend (chan);
- break;
- case FLUID_MOD_PITCHWHEELSENS:
- v2 = fluid_channel_get_pitch_wheel_sensitivity (chan);
- break;
- default:
- v1 = 0.0f;
- }
- }
- /* transform the second input value */
- switch (mod->flags2 & 0x0f) {
- case 0: /* linear, unipolar, positive */
- v2 /= range2;
- break;
- case 1: /* linear, unipolar, negative */
- v2 = 1.0f - v2 / range2;
- break;
- case 2: /* linear, bipolar, positive */
- v2 = -1.0f + 2.0f * v2 / range2;
- break;
- case 3: /* linear, bipolar, negative */
- v2 = -1.0f + 2.0f * v2 / range2;
- break;
- case 4: /* concave, unipolar, positive */
- v2 = fluid_concave(v2);
- break;
- case 5: /* concave, unipolar, negative */
- v2 = fluid_concave(127 - v2);
- break;
- case 6: /* concave, bipolar, positive */
- v2 = (v2 > 64)? fluid_concave(2 * (v2 - 64)) : -fluid_concave(2 * (64 - v2));
- break;
- case 7: /* concave, bipolar, negative */
- v2 = (v2 > 64)? -fluid_concave(2 * (v2 - 64)) : fluid_concave(2 * (64 - v2));
- break;
- case 8: /* convex, unipolar, positive */
- v2 = fluid_convex(v2);
- break;
- case 9: /* convex, unipolar, negative */
- v2 = 1.0f - fluid_convex(v2);
- break;
- case 10: /* convex, bipolar, positive */
- v2 = (v2 > 64)? -fluid_convex(2 * (v2 - 64)) : fluid_convex(2 * (64 - v2));
- break;
- case 11: /* convex, bipolar, negative */
- v2 = (v2 > 64)? -fluid_convex(2 * (v2 - 64)) : fluid_convex(2 * (64 - v2));
- break;
- case 12: /* switch, unipolar, positive */
- v2 = (v2 >= 64)? 1.0f : 0.0f;
- break;
- case 13: /* switch, unipolar, negative */
- v2 = (v2 >= 64)? 0.0f : 1.0f;
- break;
- case 14: /* switch, bipolar, positive */
- v2 = (v2 >= 64)? 1.0f : -1.0f;
- break;
- case 15: /* switch, bipolar, negative */
- v2 = (v2 >= 64)? -1.0f : 1.0f;
- break;
- }
- } else {
- v2 = 1.0f;
- }
- /* it's as simple as that: */
- return (fluid_real_t) mod->amount * v1 * v2;
- }
- /**
- * Create a new uninitialized modulator structure.
- * @return New allocated modulator or NULL if out of memory
- */
- fluid_mod_t*
- fluid_mod_new()
- {
- fluid_mod_t* mod = FLUID_NEW (fluid_mod_t);
- if (mod == NULL) {
- FLUID_LOG(FLUID_ERR, "Out of memory");
- return NULL;
- }
- return mod;
- }
- /**
- * Free a modulator structure.
- * @param mod Modulator to free
- */
- void
- fluid_mod_delete (fluid_mod_t *mod)
- {
- FLUID_FREE(mod);
- }
- /**
- * Checks if two modulators are identical in sources, flags and destination.
- * @param mod1 First modulator
- * @param mod2 Second modulator
- * @return TRUE if identical, FALSE otherwise
- *
- * SF2.01 section 9.5.1 page 69, 'bullet' 3 defines 'identical'.
- */
- int
- fluid_mod_test_identity (fluid_mod_t *mod1, fluid_mod_t *mod2)
- {
- return mod1->dest == mod2->dest
- && mod1->src1 == mod2->src1
- && mod1->src2 == mod2->src2
- && mod1->flags1 == mod2->flags1
- && mod1->flags2 == mod2->flags2;
- }
- /* debug function: Prints the contents of a modulator */
- void fluid_dump_modulator(fluid_mod_t * mod){
- int src1=mod->src1;
- int dest=mod->dest;
- int src2=mod->src2;
- int flags1=mod->flags1;
- int flags2=mod->flags2;
- fluid_real_t amount=(fluid_real_t)mod->amount;
- printf("Src: ");
- if (flags1 & FLUID_MOD_CC){
- printf("MIDI CC=%i",src1);
- } else {
- switch(src1){
- case FLUID_MOD_NONE:
- printf("None"); break;
- case FLUID_MOD_VELOCITY:
- printf("note-on velocity"); break;
- case FLUID_MOD_KEY:
- printf("Key nr"); break;
- case FLUID_MOD_KEYPRESSURE:
- printf("Poly pressure"); break;
- case FLUID_MOD_CHANNELPRESSURE:
- printf("Chan pressure"); break;
- case FLUID_MOD_PITCHWHEEL:
- printf("Pitch Wheel"); break;
- case FLUID_MOD_PITCHWHEELSENS:
- printf("Pitch Wheel sens"); break;
- default:
- printf("(unknown: %i)", src1);
- }; /* switch src1 */
- }; /* if not CC */
- if (flags1 & FLUID_MOD_NEGATIVE){printf("- ");} else {printf("+ ");};
- if (flags1 & FLUID_MOD_BIPOLAR){printf("bip ");} else {printf("unip ");};
- printf("-> ");
- switch(dest){
- case GEN_FILTERQ: printf("Q"); break;
- case GEN_FILTERFC: printf("fc"); break;
- case GEN_VIBLFOTOPITCH: printf("VibLFO-to-pitch"); break;
- case GEN_MODENVTOPITCH: printf("ModEnv-to-pitch"); break;
- case GEN_MODLFOTOPITCH: printf("ModLFO-to-pitch"); break;
- case GEN_CHORUSSEND: printf("Chorus send"); break;
- case GEN_REVERBSEND: printf("Reverb send"); break;
- case GEN_PAN: printf("pan"); break;
- case GEN_ATTENUATION: printf("att"); break;
- default: printf("dest %i",dest);
- }; /* switch dest */
- printf(", amount %f flags %i src2 %i flags2 %in",amount, flags1, src2, flags2);
- };