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// This file is part of the 64k demo project.
// It implements the production audio backend using miniaudio.
// Moved from audio.cc to enable backend abstraction for testing.
#include "miniaudio_backend.h"
#include "audio.h"
#include "ring_buffer.h"
#include <stdio.h>
// Static callback for miniaudio (C API requirement)
void MiniaudioBackend::audio_callback(ma_device* pDevice, void* pOutput,
const void* pInput,
ma_uint32 frameCount) {
(void)pDevice;
(void)pInput;
float* fOutput = (float*)pOutput;
// Read from ring buffer instead of calling synth directly
AudioRingBuffer* ring_buffer = audio_get_ring_buffer();
if (ring_buffer != nullptr) {
const int samples_to_read = (int)frameCount * 2; // Stereo
ring_buffer->read(fOutput, samples_to_read);
}
}
MiniaudioBackend::MiniaudioBackend() : initialized_(false) {
}
MiniaudioBackend::~MiniaudioBackend() {
if (initialized_) {
shutdown();
}
}
void MiniaudioBackend::init() {
if (initialized_) {
return;
}
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 = MiniaudioBackend::audio_callback;
config.pUserData = this;
if (ma_device_init(NULL, &config, &device_) != MA_SUCCESS) {
printf("Failed to open playback device.\n");
return;
}
initialized_ = true;
}
void MiniaudioBackend::start() {
if (!initialized_) {
printf("Cannot start: backend not initialized.\n");
return;
}
if (ma_device_start(&device_) != MA_SUCCESS) {
printf("Failed to start playback device.\n");
ma_device_uninit(&device_);
initialized_ = false;
return;
}
}
void MiniaudioBackend::shutdown() {
if (!initialized_) {
return;
}
ma_device_stop(&device_);
ma_device_uninit(&device_);
initialized_ = false;
}
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