envelope, filter cutoff/resonance mapped to default modulators (with semi-random magic numbers)
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Alex Birch
parent
c8ae1b0e9a
commit
bcf0d7dd7d
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@ -4,6 +4,7 @@
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#include <iostream>
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#include "FluidSynthModel.h"
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#include "MidiConstants.h"
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using namespace std;
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@ -15,8 +16,8 @@ FluidSynthModel::FluidSynthModel(SharesParams& p)
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currentSampleRate(44100),
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initialised(false),
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sfont_id(0),
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channel(0),
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mod(nullptr)
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channel(0)/*,
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mod(nullptr)*/
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{}
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@ -27,7 +28,7 @@ FluidSynthModel::~FluidSynthModel() {
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delete_fluid_settings(settings);
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// delete driver;
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// delete settings;
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delete_fluid_mod(mod);
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// delete_fluid_mod(mod);
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}
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}
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@ -63,37 +64,73 @@ void FluidSynthModel::initialise() {
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// changePreset(128, 13);
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float env_amount(12700.0f);
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fluid_mod_t *mod(new_fluid_mod());
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// mod = new_fluid_mod();
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//
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// // modulator's primary source controller and flags
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// // fluid_mod_src:
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// // https://github.com/FluidSynth/fluidsynth/blob/master/include/fluidsynth/mod.h#L61
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// // fluid_mod_flags:
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// // https://github.com/FluidSynth/fluidsynth/blob/master/include/fluidsynth/mod.h#L41
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// // diagrams showing what negative and concave mean:
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// // https://musescore.org/en/user/527826/blog/2016/05/23/volume-fluidsynth
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// // fluid_gen_type:
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// // https://github.com/FluidSynth/fluidsynth/blob/master/include/fluidsynth/gen.h#L36
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// // https://github.com/FluidSynth/fluidsynth/blob/master/src/synth/fluid_gen.c#L27
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// fluid_mod_set_source1(mod,
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// FLUID_MOD_KEYPRESSURE,
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// FLUID_MOD_CC |
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// FLUID_MOD_POSITIVE |
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// FLUID_MOD_UNIPOLAR |
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// FLUID_MOD_CONCAVE);
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// // modulator's secondary source controller and flags
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// // MIDI CC 74
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//// fluid_mod_set_source2(mod, 74, FLUID_MOD_CC);
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// fluid_mod_set_source2(mod, 0, 0);
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// // generator for filter cutoff
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// fluid_mod_set_dest(mod, GEN_MODENVATTACK);
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// fluid_mod_set_amount(mod, 13500.0f);
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//
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// fluid_synth_add_default_mod(synth, mod, FLUID_SYNTH_ADD);
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fluid_mod_set_source1(mod,
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static_cast<int>(SOUND_CTRL2), // MIDI CC 71 Timbre/Harmonic Intensity (filter resonance)
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FLUID_MOD_CC
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| FLUID_MOD_UNIPOLAR
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| FLUID_MOD_CONCAVE
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| FLUID_MOD_NEGATIVE);
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fluid_mod_set_source2(mod, 0, 0);
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fluid_mod_set_dest(mod, GEN_FILTERQ);
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fluid_mod_set_amount(mod, FLUID_PEAK_ATTENUATION);
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fluid_synth_add_default_mod(synth, mod, FLUID_SYNTH_ADD);
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delete_fluid_mod(mod);
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mod = new_fluid_mod();
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fluid_mod_set_source1(mod,
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static_cast<int>(SOUND_CTRL3), // MIDI CC 72 Release time
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FLUID_MOD_CC
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| FLUID_MOD_BIPOLAR
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| FLUID_MOD_CONCAVE
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| FLUID_MOD_POSITIVE);
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fluid_mod_set_source2(mod, 0, 0);
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fluid_mod_set_dest(mod, GEN_VOLENVRELEASE);
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fluid_mod_set_amount(mod, env_amount);
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fluid_synth_add_default_mod(synth, mod, FLUID_SYNTH_ADD);
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delete_fluid_mod(mod);
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mod = new_fluid_mod();
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fluid_mod_set_source1(mod,
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static_cast<int>(SOUND_CTRL4), // MIDI CC 73 Attack time
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FLUID_MOD_CC
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| FLUID_MOD_BIPOLAR
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| FLUID_MOD_CONCAVE
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| FLUID_MOD_POSITIVE);
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fluid_mod_set_source2(mod, 0, 0);
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fluid_mod_set_dest(mod, GEN_VOLENVATTACK);
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fluid_mod_set_amount(mod, env_amount);
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fluid_synth_add_default_mod(synth, mod, FLUID_SYNTH_ADD);
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delete_fluid_mod(mod);
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mod = new_fluid_mod();
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fluid_mod_set_source1(mod,
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static_cast<int>(SOUND_CTRL5), // MIDI CC 74 Brightness (cutoff frequency, FILTERFC)
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FLUID_MOD_CC
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| FLUID_MOD_SWITCH
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| FLUID_MOD_UNIPOLAR
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| FLUID_MOD_POSITIVE);
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fluid_mod_set_source2(mod, 0, 0);
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fluid_mod_set_dest(mod, GEN_FILTERFC);
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fluid_mod_set_amount(mod, -2400.0f);
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fluid_synth_add_default_mod(synth, mod, FLUID_SYNTH_ADD);
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delete_fluid_mod(mod);
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mod = new_fluid_mod();
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fluid_mod_set_source1(mod,
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static_cast<int>(SOUND_CTRL6), // MIDI CC 75 Decay Time
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FLUID_MOD_CC
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| FLUID_MOD_BIPOLAR
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| FLUID_MOD_CONCAVE
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| FLUID_MOD_POSITIVE);
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fluid_mod_set_source2(mod, 0, 0);
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fluid_mod_set_dest(mod, GEN_VOLENVDECAY);
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fluid_mod_set_amount(mod, env_amount);
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fluid_synth_add_default_mod(synth, mod, FLUID_SYNTH_ADD);
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delete_fluid_mod(mod);
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initialised = true;
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}
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@ -88,7 +88,7 @@ private:
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unsigned int sfont_id;
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unsigned int channel;
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fluid_mod_t* mod;
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// fluid_mod_t* mod;
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ListenerList<Listener> eventListeners;
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@ -1,7 +1,10 @@
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#pragma once
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/* Taken from fluidsynth/src/midi/fluid_midi.h
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/* Taken from:
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* fluidsynth/src/midi/fluid_midi.h
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* fluidsynth/src/utils/fluid_conv_tables.h
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* https://github.com/FluidSynth/fluidsynth/blob/master/src/midi/fluid_midi.h
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* https://github.com/FluidSynth/fluidsynth/blob/master/src/utils/fluid_conv_tables.h
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*
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* FluidSynth - A Software Synthesizer
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*
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@ -128,3 +131,34 @@ enum fluid_midi_control_change
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POLY_OFF = 0x7E,
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POLY_ON = 0x7F
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};
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/*
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Attenuation range in centibels.
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Attenuation range is the dynamic range of the volume envelope generator
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from 0 to the end of attack segment.
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fluidsynth is a 24 bit synth, it could (should??) be 144 dB of attenuation.
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However the spec makes no distinction between 16 or 24 bit synths, so use
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96 dB here.
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Note about usefulness of 24 bits:
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1)Even fluidsynth is a 24 bit synth, this format is only relevant if
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the sample format coming from the soundfont is 24 bits and the audio sample format
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choosen by the application (audio.sample.format) is not 16 bits.
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2)When the sample soundfont is 16 bits, the internal 24 bits number have
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16 bits msb and lsb to 0. Consequently, at the DAC output, the dynamic range of
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this 24 bit sample is reduced to the the dynamic of a 16 bits sample (ie 90 db)
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even if this sample is produced by the audio driver using an audio sample format
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compatible for a 24 bit DAC.
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3)When the audio sample format settings is 16 bits (audio.sample.format), the
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audio driver will make use of a 16 bit DAC, and the dynamic will be reduced to 96 dB
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even if the initial sample comes from a 24 bits soundfont.
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In both cases (2) or (3), the real dynamic range is only 96 dB.
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Other consideration for FLUID_NOISE_FLOOR related to case (1),(2,3):
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- for case (1), FLUID_NOISE_FLOOR should be the noise floor for 24 bits (i.e -138 dB).
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- for case (2) or (3), FLUID_NOISE_FLOOR should be the noise floor for 16 bits (i.e -90 dB).
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*/
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#define FLUID_PEAK_ATTENUATION 960.0f
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