src/audio/audio.cc


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// This file is part of the 64k demo project.
// It manages the low-level audio device and high-level audio state.
// Implementation uses miniaudio for cross-platform support.

#include "audio.h"
#define MINIAUDIO_IMPLEMENTATION
#include "miniaudio.h"
#include "synth.h"

#include <stdio.h>

static ma_device g_device;

void audio_data_callback(ma_device *pDevice, void *pOutput, const void *pInput,
                         ma_uint32 frameCount) {
  (void)pInput;
  float *fOutput = (float *)pOutput;
  synth_render(fOutput, (int)frameCount);
}

void audio_init() {
  synth_init();

  ma_device_config config = ma_device_config_init(ma_device_type_playback);
  config.playback.format = ma_format_f32;
  config.playback.channels = 2;
  config.sampleRate = 32000;
  config.dataCallback = audio_data_callback;

  if (ma_device_init(NULL, &config, &g_device) != MA_SUCCESS) {
    printf("Failed to open playback device.\n");
    return;
  }

  if (ma_device_start(&g_device) != MA_SUCCESS) {
    printf("Failed to start playback device.\n");
    ma_device_uninit(&g_device);
    return;
  }
}

void audio_update() {
}

void audio_shutdown() {
  ma_device_stop(&g_device);
  ma_device_uninit(&g_device);
  synth_shutdown();
}