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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"
#include "util/asset_manager.h"
#define MINIAUDIO_IMPLEMENTATION
#include "miniaudio.h"
#include "synth.h"
#include <stdio.h>
int register_spec_asset(AssetId id) {
size_t size;
const uint8_t* data = GetAsset(id, &size);
if (!data || size < sizeof(SpecHeader))
return -1;
const SpecHeader* header = (const SpecHeader*)data;
const float* spectral_data = (const float*)(data + sizeof(SpecHeader));
Spectrogram spec;
spec.spectral_data_a = spectral_data;
spec.spectral_data_b = spectral_data; // No double-buffer for static assets
spec.num_frames = header->num_frames;
return synth_register_spectrogram(&spec);
}
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;
}
}
void audio_start() {
if (ma_device_start(&g_device) != MA_SUCCESS) {
printf("Failed to start playback device.\n");
ma_device_uninit(&g_device);
return;
}
}
#if !defined(STRIP_ALL)
void audio_render_silent(float duration_sec) {
const int sample_rate = 32000;
const int chunk_size = 512;
int total_frames = (int)(duration_sec * sample_rate);
float buffer[chunk_size * 2]; // Stereo
while (total_frames > 0) {
int frames_to_render =
(total_frames > chunk_size) ? chunk_size : total_frames;
synth_render(buffer, frames_to_render);
total_frames -= frames_to_render;
}
}
#endif /* !defined(STRIP_ALL) */
void audio_update() {
}
void audio_shutdown() {
ma_device_stop(&g_device);
ma_device_uninit(&g_device);
synth_shutdown();
}
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