606 lines
15 KiB
C
606 lines
15 KiB
C
/* Copyright 2016 Jack Humbert
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "audio.h"
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#include "ch.h"
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#include "hal.h"
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#include <string.h>
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#include "print.h"
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#include "keymap.h"
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#include "eeconfig.h"
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// -----------------------------------------------------------------------------
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int voices = 0;
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int voice_place = 0;
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float frequency = 0;
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float frequency_alt = 0;
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int volume = 0;
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long position = 0;
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float frequencies[8] = {0, 0, 0, 0, 0, 0, 0, 0};
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int volumes[8] = {0, 0, 0, 0, 0, 0, 0, 0};
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bool sliding = false;
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float place = 0;
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uint8_t * sample;
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uint16_t sample_length = 0;
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bool playing_notes = false;
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bool playing_note = false;
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float note_frequency = 0;
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float note_length = 0;
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uint8_t note_tempo = TEMPO_DEFAULT;
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float note_timbre = TIMBRE_DEFAULT;
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uint16_t note_position = 0;
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float (* notes_pointer)[][2];
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uint16_t notes_count;
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bool notes_repeat;
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bool note_resting = false;
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uint8_t current_note = 0;
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uint8_t rest_counter = 0;
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#ifdef VIBRATO_ENABLE
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float vibrato_counter = 0;
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float vibrato_strength = .5;
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float vibrato_rate = 0.125;
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#endif
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float polyphony_rate = 0;
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static bool audio_initialized = false;
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audio_config_t audio_config;
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uint16_t envelope_index = 0;
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bool glissando = true;
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#ifndef STARTUP_SONG
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#define STARTUP_SONG SONG(STARTUP_SOUND)
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#endif
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float startup_song[][2] = STARTUP_SONG;
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static void gpt_cb6(GPTDriver *gptp);
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static void gpt_cb7(GPTDriver *gptp);
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static void gpt_cb8(GPTDriver *gptp);
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/*
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* GPT6 configuration.
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*/
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GPTConfig gpt6cfg1 = {
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.frequency = 440,
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.callback = gpt_cb6,
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.cr2 = TIM_CR2_MMS_1, /* MMS = 010 = TRGO on Update Event. */
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.dier = 0U
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};
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GPTConfig gpt7cfg1 = {
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.frequency = 440,
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.callback = gpt_cb7,
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.cr2 = TIM_CR2_MMS_1, /* MMS = 010 = TRGO on Update Event. */
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.dier = 0U
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};
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GPTConfig gpt8cfg1 = {
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.frequency = 10,
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.callback = gpt_cb8,
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.cr2 = TIM_CR2_MMS_1, /* MMS = 010 = TRGO on Update Event. */
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.dier = 0U
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};
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static void gpt_cb6(GPTDriver *gptp) {
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palTogglePad(GPIOA, 4);
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}
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static void gpt_cb7(GPTDriver *gptp) {
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palTogglePad(GPIOA, 5);
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}
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void audio_init()
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{
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if (audio_initialized)
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return;
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// Check EEPROM
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// if (!eeconfig_is_enabled())
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// {
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// eeconfig_init();
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// }
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// audio_config.raw = eeconfig_read_audio();
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audio_config.enable = true;
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palSetPadMode(GPIOA, 4, PAL_MODE_OUTPUT_PUSHPULL);
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palSetPadMode(GPIOA, 5, PAL_MODE_OUTPUT_PUSHPULL);
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audio_initialized = true;
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if (audio_config.enable) {
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PLAY_SONG(startup_song);
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}
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}
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void stop_all_notes()
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{
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dprintf("audio stop all notes");
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if (!audio_initialized) {
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audio_init();
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}
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voices = 0;
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gptStopTimer(&GPTD6);
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gptStopTimer(&GPTD7);
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gptStopTimer(&GPTD8);
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playing_notes = false;
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playing_note = false;
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frequency = 0;
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frequency_alt = 0;
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volume = 0;
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for (uint8_t i = 0; i < 8; i++)
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{
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frequencies[i] = 0;
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volumes[i] = 0;
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}
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}
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void stop_note(float freq)
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{
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dprintf("audio stop note freq=%d", (int)freq);
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if (playing_note) {
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if (!audio_initialized) {
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audio_init();
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}
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for (int i = 7; i >= 0; i--) {
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if (frequencies[i] == freq) {
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frequencies[i] = 0;
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volumes[i] = 0;
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for (int j = i; (j < 7); j++) {
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frequencies[j] = frequencies[j+1];
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frequencies[j+1] = 0;
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volumes[j] = volumes[j+1];
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volumes[j+1] = 0;
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}
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break;
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}
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}
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voices--;
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if (voices < 0)
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voices = 0;
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if (voice_place >= voices) {
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voice_place = 0;
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}
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if (voices == 0) {
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gptStopTimer(&GPTD6);
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gptStopTimer(&GPTD7);
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gptStopTimer(&GPTD8);
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frequency = 0;
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frequency_alt = 0;
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volume = 0;
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playing_note = false;
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}
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}
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}
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#ifdef VIBRATO_ENABLE
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float mod(float a, int b)
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{
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float r = fmod(a, b);
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return r < 0 ? r + b : r;
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}
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float vibrato(float average_freq) {
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#ifdef VIBRATO_STRENGTH_ENABLE
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float vibrated_freq = average_freq * pow(vibrato_lut[(int)vibrato_counter], vibrato_strength);
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#else
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float vibrated_freq = average_freq * vibrato_lut[(int)vibrato_counter];
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#endif
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vibrato_counter = mod((vibrato_counter + vibrato_rate * (1.0 + 440.0/average_freq)), VIBRATO_LUT_LENGTH);
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return vibrated_freq;
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}
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#endif
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static void restart_gpt6(void) {
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// gptStopTimer(&GPTD6);
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gptStart(&GPTD6, &gpt6cfg1);
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gptStartContinuous(&GPTD6, 2U);
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}
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static void restart_gpt7(void) {
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// gptStopTimer(&GPTD7);
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gptStart(&GPTD7, &gpt7cfg1);
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gptStartContinuous(&GPTD7, 2U);
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}
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static void gpt_cb8(GPTDriver *gptp) {
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float freq;
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if (playing_note) {
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if (voices > 0) {
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float freq_alt = 0;
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if (voices > 1) {
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if (polyphony_rate == 0) {
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if (glissando) {
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if (frequency_alt != 0 && frequency_alt < frequencies[voices - 2] && frequency_alt < frequencies[voices - 2] * pow(2, -440/frequencies[voices - 2]/12/2)) {
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frequency_alt = frequency_alt * pow(2, 440/frequency_alt/12/2);
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} else if (frequency_alt != 0 && frequency_alt > frequencies[voices - 2] && frequency_alt > frequencies[voices - 2] * pow(2, 440/frequencies[voices - 2]/12/2)) {
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frequency_alt = frequency_alt * pow(2, -440/frequency_alt/12/2);
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} else {
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frequency_alt = frequencies[voices - 2];
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}
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} else {
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frequency_alt = frequencies[voices - 2];
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}
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#ifdef VIBRATO_ENABLE
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if (vibrato_strength > 0) {
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freq_alt = vibrato(frequency_alt);
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} else {
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freq_alt = frequency_alt;
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}
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#else
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freq_alt = frequency_alt;
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#endif
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}
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if (envelope_index < 65535) {
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envelope_index++;
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}
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freq_alt = voice_envelope(freq_alt);
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if (freq_alt < 30.517578125) {
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freq_alt = 30.52;
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}
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if (gpt6cfg1.frequency != (uint16_t)freq_alt) {
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gpt6cfg1.frequency = freq_alt;
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restart_gpt6();
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}
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//note_timbre;
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} else {
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// gptStopTimer(&GPTD6);
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}
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if (polyphony_rate > 0) {
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if (voices > 1) {
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voice_place %= voices;
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if (place++ > (frequencies[voice_place] / polyphony_rate)) {
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voice_place = (voice_place + 1) % voices;
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place = 0.0;
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}
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}
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#ifdef VIBRATO_ENABLE
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if (vibrato_strength > 0) {
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freq = vibrato(frequencies[voice_place]);
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} else {
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freq = frequencies[voice_place];
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}
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#else
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freq = frequencies[voice_place];
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#endif
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} else {
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if (glissando) {
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if (frequency != 0 && frequency < frequencies[voices - 1] && frequency < frequencies[voices - 1] * pow(2, -440/frequencies[voices - 1]/12/2)) {
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frequency = frequency * pow(2, 440/frequency/12/2);
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} else if (frequency != 0 && frequency > frequencies[voices - 1] && frequency > frequencies[voices - 1] * pow(2, 440/frequencies[voices - 1]/12/2)) {
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frequency = frequency * pow(2, -440/frequency/12/2);
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} else {
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frequency = frequencies[voices - 1];
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}
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} else {
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frequency = frequencies[voices - 1];
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}
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#ifdef VIBRATO_ENABLE
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if (vibrato_strength > 0) {
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freq = vibrato(frequency);
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} else {
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freq = frequency;
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}
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#else
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freq = frequency;
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#endif
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}
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if (envelope_index < 65535) {
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envelope_index++;
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}
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freq = voice_envelope(freq);
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if (freq < 30.517578125) {
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freq = 30.52;
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}
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if (gpt7cfg1.frequency != (uint16_t)freq) {
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gpt7cfg1.frequency = freq;
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restart_gpt7();
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}
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//note_timbre;
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} else {
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// gptStopTimer(&GPTD7);
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}
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}
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if (playing_notes) {
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if (note_frequency > 0) {
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#ifdef VIBRATO_ENABLE
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if (vibrato_strength > 0) {
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freq = vibrato(note_frequency);
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} else {
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freq = note_frequency;
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}
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#else
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freq = note_frequency;
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#endif
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if (envelope_index < 65535) {
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envelope_index++;
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}
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freq = voice_envelope(freq);
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if (gpt6cfg1.frequency != (uint16_t)freq) {
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gpt6cfg1.frequency = freq;
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restart_gpt6();
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gpt7cfg1.frequency = freq;
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restart_gpt7();
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}
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//note_timbre;
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} else {
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// gptStopTimer(&GPTD6);
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// gptStopTimer(&GPTD7);
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}
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note_position++;
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bool end_of_note = false;
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if (gpt6cfg1.frequency > 0) {
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if (!note_resting)
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end_of_note = (note_position >= (note_length*16 - 1));
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else
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end_of_note = (note_position >= (note_length*16));
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} else {
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end_of_note = (note_position >= (note_length*16));
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}
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if (end_of_note) {
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current_note++;
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if (current_note >= notes_count) {
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if (notes_repeat) {
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current_note = 0;
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} else {
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gptStopTimer(&GPTD6);
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gptStopTimer(&GPTD7);
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// gptStopTimer(&GPTD8);
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playing_notes = false;
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return;
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}
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}
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if (!note_resting) {
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note_resting = true;
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current_note--;
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if ((*notes_pointer)[current_note][0] == (*notes_pointer)[current_note + 1][0]) {
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note_frequency = 0;
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note_length = 1;
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} else {
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note_frequency = (*notes_pointer)[current_note][0];
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note_length = 1;
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}
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} else {
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note_resting = false;
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envelope_index = 0;
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note_frequency = (*notes_pointer)[current_note][0];
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note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
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}
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note_position = 0;
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}
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}
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if (!audio_config.enable) {
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playing_notes = false;
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playing_note = false;
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}
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}
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void play_note(float freq, int vol) {
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dprintf("audio play note freq=%d vol=%d", (int)freq, vol);
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if (!audio_initialized) {
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audio_init();
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}
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if (audio_config.enable && voices < 8) {
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// Cancel notes if notes are playing
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if (playing_notes)
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stop_all_notes();
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playing_note = true;
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envelope_index = 0;
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if (freq > 0) {
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frequencies[voices] = freq;
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volumes[voices] = vol;
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voices++;
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}
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gptStart(&GPTD8, &gpt8cfg1);
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gptStartContinuous(&GPTD8, 2U);
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}
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}
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void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat)
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{
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if (!audio_initialized) {
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audio_init();
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}
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if (audio_config.enable) {
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// Cancel note if a note is playing
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if (playing_note)
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stop_all_notes();
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playing_notes = true;
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notes_pointer = np;
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notes_count = n_count;
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notes_repeat = n_repeat;
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place = 0;
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current_note = 0;
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note_frequency = (*notes_pointer)[current_note][0];
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note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
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note_position = 0;
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gptStart(&GPTD8, &gpt8cfg1);
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gptStartContinuous(&GPTD8, 2U);
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restart_gpt6();
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restart_gpt7();
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}
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}
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bool is_playing_notes(void) {
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return playing_notes;
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}
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bool is_audio_on(void) {
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return (audio_config.enable != 0);
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}
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void audio_toggle(void) {
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audio_config.enable ^= 1;
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eeconfig_update_audio(audio_config.raw);
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if (audio_config.enable)
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audio_on_user();
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}
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void audio_on(void) {
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audio_config.enable = 1;
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eeconfig_update_audio(audio_config.raw);
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audio_on_user();
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}
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void audio_off(void) {
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audio_config.enable = 0;
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eeconfig_update_audio(audio_config.raw);
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}
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#ifdef VIBRATO_ENABLE
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// Vibrato rate functions
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void set_vibrato_rate(float rate) {
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vibrato_rate = rate;
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}
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void increase_vibrato_rate(float change) {
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vibrato_rate *= change;
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}
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void decrease_vibrato_rate(float change) {
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vibrato_rate /= change;
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}
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#ifdef VIBRATO_STRENGTH_ENABLE
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void set_vibrato_strength(float strength) {
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vibrato_strength = strength;
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}
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void increase_vibrato_strength(float change) {
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vibrato_strength *= change;
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}
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void decrease_vibrato_strength(float change) {
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vibrato_strength /= change;
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}
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#endif /* VIBRATO_STRENGTH_ENABLE */
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#endif /* VIBRATO_ENABLE */
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// Polyphony functions
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void set_polyphony_rate(float rate) {
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polyphony_rate = rate;
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}
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void enable_polyphony() {
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polyphony_rate = 5;
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}
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void disable_polyphony() {
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polyphony_rate = 0;
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}
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void increase_polyphony_rate(float change) {
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polyphony_rate *= change;
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}
|
|
|
|
void decrease_polyphony_rate(float change) {
|
|
polyphony_rate /= change;
|
|
}
|
|
|
|
// Timbre function
|
|
|
|
void set_timbre(float timbre) {
|
|
note_timbre = timbre;
|
|
}
|
|
|
|
// Tempo functions
|
|
|
|
void set_tempo(uint8_t tempo) {
|
|
note_tempo = tempo;
|
|
}
|
|
|
|
void decrease_tempo(uint8_t tempo_change) {
|
|
note_tempo += tempo_change;
|
|
}
|
|
|
|
void increase_tempo(uint8_t tempo_change) {
|
|
if (note_tempo - tempo_change < 10) {
|
|
note_tempo = 10;
|
|
} else {
|
|
note_tempo -= tempo_change;
|
|
}
|
|
}
|