mirror of https://github.com/arendst/Tasmota.git
79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
#include <Arduino.h>
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#include "AudioFileSourceFunction.h"
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#include "AudioGeneratorWAV.h"
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#include "AudioOutputI2SNoDAC.h"
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float hz = 440.f;
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// pre-defined function can also be used to generate the wave
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float sine_wave(const float time) {
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float v = sin(TWO_PI * hz * time); // C
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v *= fmod(time, 1.f); // change linear
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v *= 0.5; // scale
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return v;
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};
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AudioGeneratorWAV* wav;
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AudioFileSourceFunction* file;
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AudioOutputI2SNoDAC* out;
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void setup() {
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Serial.begin(115200);
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delay(1000);
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// ===== create instance with length of song in [sec] =====
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file = new AudioFileSourceFunction(8.);
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//
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// you can set (sec, channels, hz, bit/sample) but you should care about
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// the trade-off between performance and the audio quality
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//
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// file = new AudioFileSourceFunction(sec, channels, hz, bit/sample);
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// channels : default = 1
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// hz : default = 8000 (8000, 11025, 22050, 44100, 48000, etc.)
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// bit/sample : default = 16 (8, 16, 32)
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// ===== set your sound function =====
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file->addAudioGenerators([&](const float time) {
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float v = sin(TWO_PI * hz * time); // generate sine wave
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v *= fmod(time, 1.f); // change linear
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v *= 0.5; // scale
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return v;
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});
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//
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// sound function should have one argument(float) and one return(float)
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// param : float (current time [sec] of the song)
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// return : float (the amplitude of sound which varies from -1.f to +1.f)
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//
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// sound function can be registered only one or the same number with channels
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// if the channels > 1 && the number of function == 1,
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// same function are used to generate the sound in every channel
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//
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// file = new AudioFileSourceFunction(8., 2);
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// file->addAudioGenerators(
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// // L (channel 0)
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// [](const float time) {
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// return 0.25 * sin(TWO_PI * 440.f * time) * fmod(time, 1.f); // C
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// },
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// // R (channel 1)
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// [](const float time) {
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// return 0.25 * sin(TWO_PI * 550.f * time) * fmod(time, 1.f); // E
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// }
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// );
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//
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// you can also use the pre-defined function
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// file->addAudioGenerators(sine_wave);
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out = new AudioOutputI2SNoDAC();
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wav = new AudioGeneratorWAV();
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wav->begin(file, out);
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}
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void loop() {
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if (wav->isRunning()) {
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if (!wav->loop()) wav->stop();
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} else {
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Serial.println("function done!");
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delay(1000);
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}
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}
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