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‎README.md‎

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Original file line numberDiff line numberDiff line change
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A modular synthesizer application written in C, using SDL2 for graphics and audio, and supporting MIDI input via libremidi. The GUI is resizable and features oscilloscope and spectrum displays, keyboard input, and real-time control of oscillators, effects, mixer, and arpeggiator.
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![sdl2-synth screenshot](screenshot.png)
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![GitHub last commit](https://img.shields.io/github/last-commit/koppi/sdl2-synth)
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![GitHub commit activity](https://img.shields.io/github/commit-activity/w/koppi/sdl2-synth)
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[![OS](https://github.com/koppi/sdl2-synth/actions/workflows/os.yml/badge.svg)](https://github.com/koppi/sdl2-synth/actions/workflows/os.yml)
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[![Web](https://github.com/koppi/sdl2-synth/actions/workflows/web.yml/badge.svg)](https://github.com/koppi/sdl2-synth/actions/workflows/web.yml)
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[![GitHub issues](https://img.shields.io/github/issues/koppi/sdl2-synth)](https://github.com/koppi/sdl2-synth/issues)
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![sdl2-synth screenshot](screenshot.png)
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## Features
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- **4-oscillator synth**: Each with independent waveform, pitch, detune, gain, phase, pulse width, and unison controls.

‎src/synth.c‎

Lines changed: 58 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -452,37 +452,91 @@ char* synth_save_preset_json(const Synth *synth) {
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cJSON_AddNumberToObject(osc, "pitch", synth->osc[i].pitch);
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cJSON_AddNumberToObject(osc, "detune", synth->osc[i].detune);
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cJSON_AddNumberToObject(osc, "gain", synth->osc[i].gain);
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cJSON_AddNumberToObject(osc, "pan", synth->osc[i].pan);
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cJSON_AddNumberToObject(osc, "pulse_width", synth->osc[i].pulse_width);
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cJSON_AddNumberToObject(osc, "unison_voices", synth->osc[i].unison_voices);
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cJSON_AddNumberToObject(osc, "unison_detune", synth->osc[i].unison_detune);
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cJSON_AddItemToArray(oscillators, osc);
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}
457-
cJSON_AddItemToObject(root, "oscillators", oscillators);
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cJSON_AddItemToObject(root, "oscillators", oscillators);
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// Save ADSR Envelope parameters
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cJSON *adsr = cJSON_CreateObject();
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cJSON_AddNumberToObject(adsr, "attack", synth->adsr.attack);
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cJSON_AddNumberToObject(adsr, "decay", synth->adsr.decay);
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cJSON_AddNumberToObject(adsr, "sustain", synth->adsr.sustain);
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cJSON_AddNumberToObject(adsr, "release", synth->adsr.release);
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cJSON_AddItemToObject(root, "adsr", adsr);
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// Save LFO parameters
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cJSON *lfos = cJSON_CreateArray();
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for (int i = 0; i < 3; ++i) {
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cJSON *lfo = cJSON_CreateObject();
475+
cJSON_AddNumberToObject(lfo, "waveform", synth->lfos[i].waveform);
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cJSON_AddNumberToObject(lfo, "frequency", synth->lfos[i].frequency);
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cJSON_AddNumberToObject(lfo, "depth", synth->lfos[i].depth);
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cJSON_AddNumberToObject(lfo, "phase", synth->lfos[i].phase);
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cJSON_AddNumberToObject(lfo, "gain", synth->lfos[i].gain);
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cJSON_AddNumberToObject(lfo, "target", synth->lfos[i].target);
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cJSON_AddNumberToObject(lfo, "sync", synth->lfos[i].sync);
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cJSON_AddBoolToObject(lfo, "enabled", synth->lfos[i].enabled);
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cJSON_AddItemToArray(lfos, lfo);
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}
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cJSON_AddItemToObject(root, "lfos", lfos);
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// Save Mixer parameters
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cJSON *mixer = cJSON_CreateObject();
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cJSON_AddNumberToObject(mixer, "master_gain", synth->mixer.master);
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cJSON_AddNumberToObject(mixer, "master_pan", synth->mixer.master_pan);
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cJSON_AddNumberToObject(mixer, "master_width", synth->mixer.master_width);
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cJSON *osc_gains = cJSON_CreateArray();
463-
for (int i = 0; i < 4; ++i) {
493+
for (int i = 0; i < 6; ++i) {
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cJSON_AddItemToArray(osc_gains, cJSON_CreateNumber(synth->mixer.osc_gain[i]));
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}
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cJSON_AddItemToObject(mixer, "osc_gains", osc_gains);
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// Add compressor parameters
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cJSON_AddNumberToObject(mixer, "comp_enabled", synth->mixer.comp_enabled);
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cJSON_AddNumberToObject(mixer, "comp_threshold", synth->mixer.comp_threshold);
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cJSON_AddNumberToObject(mixer, "comp_ratio", synth->mixer.comp_ratio);
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cJSON_AddNumberToObject(mixer, "comp_attack", synth->mixer.comp_attack);
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cJSON_AddNumberToObject(mixer, "comp_release", synth->mixer.comp_release);
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cJSON_AddNumberToObject(mixer, "comp_makeup_gain", synth->mixer.comp_makeup_gain);
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cJSON_AddNumberToObject(mixer, "dc_filter_enabled", synth->mixer.dc_filter_enabled);
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cJSON_AddNumberToObject(mixer, "dc_filter_freq", synth->mixer.dc_filter_freq);
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cJSON_AddNumberToObject(mixer, "soft_clip_enabled", synth->mixer.soft_clip_enabled);
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cJSON_AddNumberToObject(mixer, "soft_clip_threshold", synth->mixer.soft_clip_threshold);
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cJSON_AddNumberToObject(mixer, "soft_clip_ratio", synth->mixer.soft_clip_ratio);
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cJSON_AddNumberToObject(mixer, "auto_gain_enabled", synth->mixer.auto_gain_enabled);
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cJSON_AddNumberToObject(mixer, "auto_gain_target", synth->mixer.auto_gain_target);
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cJSON_AddItemToObject(root, "mixer", mixer);
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475513
// Save FX parameters
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cJSON *fx = cJSON_CreateObject();
515+
cJSON_AddNumberToObject(fx, "filter_enabled", synth->fx.filter_enabled);
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cJSON_AddNumberToObject(fx, "filter_type", synth->fx.filter_type);
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cJSON_AddNumberToObject(fx, "filter_cutoff", synth->fx.filter_cutoff);
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cJSON_AddNumberToObject(fx, "filter_resonance", synth->fx.filter_resonance);
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cJSON_AddNumberToObject(fx, "filter_drive", synth->fx.filter_drive);
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cJSON_AddNumberToObject(fx, "filter_mix", synth->fx.filter_mix);
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cJSON_AddNumberToObject(fx, "filter_oversampling", synth->fx.filter_oversampling);
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cJSON_AddNumberToObject(fx, "flanger_depth", synth->fx.flanger_depth);
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cJSON_AddNumberToObject(fx, "flanger_rate", synth->fx.flanger_rate);
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cJSON_AddNumberToObject(fx, "flanger_feedback", synth->fx.flanger_feedback);
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cJSON_AddNumberToObject(fx, "delay_time", synth->fx.delay_time);
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cJSON_AddNumberToObject(fx, "delay_feedback", synth->fx.delay_feedback);
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cJSON_AddNumberToObject(fx, "delay_mix", synth->fx.delay_mix);
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cJSON_AddNumberToObject(fx, "multitap_enabled", synth->fx.multitap_enabled);
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cJSON_AddNumberToObject(fx, "multitap_tap0", synth->fx.multitap_taps[0]);
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cJSON_AddNumberToObject(fx, "multitap_tap0_level", synth->fx.multitap_levels[0]);
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cJSON_AddNumberToObject(fx, "multitap_tap1", synth->fx.multitap_taps[1]);
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cJSON_AddNumberToObject(fx, "multitap_tap1_level", synth->fx.multitap_levels[1]);
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cJSON_AddNumberToObject(fx, "multitap_tap2", synth->fx.multitap_taps[2]);
534+
cJSON_AddNumberToObject(fx, "multitap_tap2_level", synth->fx.multitap_levels[2]);
535+
cJSON_AddNumberToObject(fx, "multitap_tap3", synth->fx.multitap_taps[3]);
536+
cJSON_AddNumberToObject(fx, "multitap_tap3_level", synth->fx.multitap_levels[3]);
483537
cJSON_AddNumberToObject(fx, "reverb_size", synth->fx.reverb_size);
484-
cJSON_AddNumberToObject(fx, "reverb_damping", synth->fx.reverb_damping);
485-
cJSON_AddNumberToObject(fx, "reverb_mix", synth->fx.reverb_mix);
538+
cJSON_AddNumberToObject(fx, "reverb_mix", synth->fx.reverb_damping);
539+
cJSON_AddNumberToObject(fx, "reverb_damping", synth->fx.reverb_mix);
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cJSON_AddItemToObject(root, "fx", fx);
487541

488542
// Save Ring Modulator parameters

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