doompanning/linuxdoom-1.10/ib_sound/miniaudio.c

#include "../ib_sound.h"

#include <stddef.h>

#define MINIAUDIO_IMPLEMENTATION
#define MA_NO_DECODING
#define MA_NO_ENCODING
#define MA_NO_GENERATION
#include "miniaudio.h"

// The function that actually produces the output audio
static void (*audio_callback)(short* output_buffer, size_t frames_to_do, void *user_data);

// miniaudio context
static ma_context       context;

// miniaudio context
static ma_mutex         mutex;

// The actual output device.
static ma_device        audio_device;

static void Callback(ma_device* device, void* output_buffer, const void* input_buffer, ma_uint32 frames_to_do)
{
    (void)input_buffer;

    ma_mutex_lock(&mutex);

    audio_callback((short*)output_buffer, (size_t)frames_to_do, device->pUserData);

    ma_mutex_unlock(&mutex);
}

int IB_StartupSound(void (*initial_callback)(unsigned int output_sample_rate, void *user_data), void (*_audio_callback)(short* output_buffer, size_t frames_to_do, void *user_data), void *user_data)
{
    audio_callback = _audio_callback;

    ma_context_init(NULL, 0, NULL, &context);

    ma_mutex_init(&mutex);

    ma_device_config config = ma_device_config_init(ma_device_type_playback);
    config.playback.pDeviceID = NULL;
    config.playback.format = ma_format_s16;
    config.playback.channels = 2;
    config.sampleRate = 0; // Let miniaudio decide what sample rate to use
    config.dataCallback = Callback;
    config.pUserData = user_data;
    config.noPreZeroedOutputBuffer = ma_true;

    ma_device_init(&context, &config, &audio_device);

    initial_callback(audio_device.sampleRate, user_data);

    ma_device_start(&audio_device);

    return 1;
}

void IB_ShutdownSound(void)
{
    ma_device_uninit(&audio_device);
    ma_mutex_uninit(&mutex);
    ma_context_uninit(&context);
}

void IB_LockSound(void)
{
    ma_mutex_lock(&mutex);
}

void IB_UnlockSound(void)
{
    ma_mutex_unlock(&mutex);
}