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RetroArch/audio/drivers/sdl_audio.c

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/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2017 - Daniel De Matteis
* Copyright (C) 2023-2025 - Jesse Talavera-Greenberg
*
* RetroArch is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <boolean.h>
#include <rthreads/rthreads.h>
#include <queues/fifo_queue.h>
#include <retro_inline.h>
#include <retro_math.h>
#include "SDL.h"
#include "SDL_audio.h"
#include "../audio_driver.h"
#include "../../verbosity.h"
#include "retro_assert.h"
#ifdef HAVE_SDL2
#ifdef HAVE_MICROPHONE
#include "../microphone_driver.h"
typedef struct sdl_microphone_handle
{
#ifdef HAVE_THREADS
slock_t *lock;
scond_t *cond;
#endif
/**
* The queue used to store incoming samples from the driver.
*/
fifo_buffer_t *sample_buffer;
SDL_AudioDeviceID device_id;
SDL_AudioSpec device_spec;
} sdl_microphone_handle_t;
typedef struct sdl_microphone
{
bool nonblock;
} sdl_microphone_t;
static INLINE int sdl_microphone_find_num_frames(int rate, int latency)
{
int frames = (rate * latency) / 1000;
/* SDL only likes 2^n sized buffers. */
return next_pow2(frames);
}
static void *sdl_microphone_init(void)
{
sdl_microphone_t *sdl = NULL;
uint32_t sdl_subsystem_flags = SDL_WasInit(0);
/* Initialise audio subsystem, if required */
if (sdl_subsystem_flags == 0)
{
if (SDL_Init(SDL_INIT_AUDIO) < 0)
return NULL;
}
else if ((sdl_subsystem_flags & SDL_INIT_AUDIO) == 0)
{
if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0)
return NULL;
}
if (!(sdl = (sdl_microphone_t*)calloc(1, sizeof(*sdl))))
return NULL;
return sdl;
}
static void sdl_microphone_close_mic(void *driver_context, void *mic_context)
{
sdl_microphone_handle_t *mic = (sdl_microphone_handle_t *)mic_context;
if (mic)
{
/* If the microphone was originally initialized successfully... */
if (mic->device_id > 0)
SDL_CloseAudioDevice(mic->device_id);
fifo_free(mic->sample_buffer);
#ifdef HAVE_THREADS
slock_free(mic->lock);
scond_free(mic->cond);
#endif
RARCH_LOG("[SDL audio] Freed microphone with former device ID %u.\n", mic->device_id);
free(mic);
}
}
static void sdl_microphone_free(void *data)
{
sdl_microphone_t *sdl = (sdl_microphone_t*)data;
if (sdl)
SDL_QuitSubSystem(SDL_INIT_AUDIO);
free(sdl);
/* NOTE: The microphone frontend should've closed the mics by now */
}
static void sdl_audio_record_cb(void *data, Uint8 *stream, int len)
{
sdl_microphone_handle_t *mic = (sdl_microphone_handle_t*)data;
size_t avail = FIFO_WRITE_AVAIL(mic->sample_buffer);
size_t read_size = MIN(len, (int)avail);
/* If the sample buffer is almost full, just write as much as we can into it*/
fifo_write(mic->sample_buffer, stream, read_size);
#ifdef HAVE_THREADS
scond_signal(mic->cond);
#endif
}
static void *sdl_microphone_open_mic(void *driver_context, const char *device,
unsigned rate, unsigned latency, unsigned *new_rate)
{
int frames;
size_t bufsize;
void *tmp = NULL;
sdl_microphone_handle_t *mic = NULL;
SDL_AudioSpec desired_spec = {0};
#if __APPLE__
if (!string_is_equal(audio_driver_get_ident(), "sdl2"))
{
const char *msg = msg_hash_to_str(MSG_SDL2_MIC_NEEDS_SDL2_AUDIO);
runloop_msg_queue_push(msg, strlen(msg),
1, 100, true, NULL,
MESSAGE_QUEUE_ICON_DEFAULT, MESSAGE_QUEUE_CATEGORY_WARNING);
return NULL;
}
#endif
/* If the audio driver wasn't initialized yet... */
if (!SDL_WasInit(SDL_INIT_AUDIO))
{
RARCH_ERR("[SDL mic] Attempted to initialize input device before initializing the audio subsystem.\n");
return NULL;
}
if (!(mic = (sdl_microphone_handle_t *)
calloc(1, sizeof(sdl_microphone_handle_t))))
return NULL;
/* Only print SDL audio devices if verbose logging is enabled */
if (verbosity_is_enabled())
{
int i;
int num_available_microphones = SDL_GetNumAudioDevices(true);
RARCH_DBG("[SDL mic] %d audio capture devices found:\n", num_available_microphones);
for (i = 0; i < num_available_microphones; ++i)
RARCH_DBG("[SDL mic] - %s\n", SDL_GetAudioDeviceName(i, true));
}
/* We have to buffer up some data ourselves, so we let SDL
* carry approximately half of the latency.
*
* SDL double buffers audio and we do as well. */
frames = sdl_microphone_find_num_frames(rate, latency / 4);
desired_spec.freq = rate;
desired_spec.format = AUDIO_F32SYS;
desired_spec.channels = 1; /* Microphones only usually provide input in mono */
desired_spec.samples = frames;
desired_spec.userdata = mic;
desired_spec.callback = sdl_audio_record_cb;
mic->device_id = SDL_OpenAudioDevice(
NULL,
true,
&desired_spec,
&mic->device_spec,
SDL_AUDIO_ALLOW_FREQUENCY_CHANGE
| SDL_AUDIO_ALLOW_FORMAT_CHANGE);
if (mic->device_id == 0)
{
RARCH_ERR("[SDL mic] Failed to open SDL audio input device: %s.\n", SDL_GetError());
goto error;
}
RARCH_DBG("[SDL mic] Opened SDL audio input device with ID %u.\n",
mic->device_id);
RARCH_DBG("[SDL mic] Requested a microphone frequency of %u Hz, got %u Hz.\n",
desired_spec.freq, mic->device_spec.freq);
RARCH_DBG("[SDL mic] Requested %u channels for microphone, got %u.\n",
desired_spec.channels, mic->device_spec.channels);
RARCH_DBG("[SDL mic] Requested a %u-sample microphone buffer, got %u samples (%u bytes).\n",
frames, mic->device_spec.samples, mic->device_spec.size);
RARCH_DBG("[SDL mic] Got a microphone silence value of %u.\n", mic->device_spec.silence);
RARCH_DBG("[SDL mic] Requested microphone audio format: %u-bit %s %s %s endian.\n",
SDL_AUDIO_BITSIZE(desired_spec.format),
SDL_AUDIO_ISSIGNED(desired_spec.format) ? "signed" : "unsigned",
SDL_AUDIO_ISFLOAT(desired_spec.format) ? "floating-point" : "integer",
SDL_AUDIO_ISBIGENDIAN(desired_spec.format) ? "big" : "little");
RARCH_DBG("[SDL mic] Received microphone audio format: %u-bit %s %s %s endian.\n",
SDL_AUDIO_BITSIZE(desired_spec.format),
SDL_AUDIO_ISSIGNED(desired_spec.format) ? "signed" : "unsigned",
SDL_AUDIO_ISFLOAT(desired_spec.format) ? "floating-point" : "integer",
SDL_AUDIO_ISBIGENDIAN(desired_spec.format) ? "big" : "little");
if (new_rate)
*new_rate = mic->device_spec.freq;
#ifdef HAVE_THREADS
mic->lock = slock_new();
mic->cond = scond_new();
#endif
RARCH_LOG("[SDL audio] Requested %u ms latency for input device, got %d ms.\n",
latency, (int)(mic->device_spec.samples * 4 * 1000 / mic->device_spec.freq));
/* Create a buffer twice as big as needed and prefill the buffer. */
bufsize = mic->device_spec.samples * 2 * (SDL_AUDIO_BITSIZE(mic->device_spec.format) / 8);
tmp = calloc(1, bufsize);
mic->sample_buffer = fifo_new(bufsize);
RARCH_DBG("[SDL audio] Initialized microphone sample queue with %u bytes.\n", bufsize);
if (tmp)
{
fifo_write(mic->sample_buffer, tmp, bufsize);
free(tmp);
}
RARCH_LOG("[SDL audio] Initialized microphone with device ID %u.\n", mic->device_id);
return mic;
error:
free(mic);
return NULL;
}
static bool sdl_microphone_mic_alive(const void *data, const void *mic_context)
{
const sdl_microphone_handle_t *mic = (const sdl_microphone_handle_t*)mic_context;
if (!mic)
return false;
/* Both params must be non-null */
return SDL_GetAudioDeviceStatus(mic->device_id) == SDL_AUDIO_PLAYING;
}
static bool sdl_microphone_start_mic(void *driver_context, void *mic_context)
{
sdl_microphone_handle_t *mic = (sdl_microphone_handle_t*)mic_context;
if (!mic)
return false;
SDL_PauseAudioDevice(mic->device_id, false);
if (SDL_GetAudioDeviceStatus(mic->device_id) != SDL_AUDIO_PLAYING)
{
RARCH_ERR("[SDL mic] Failed to start microphone %u: %s.\n", mic->device_id, SDL_GetError());
return false;
}
RARCH_DBG("[SDL mic] Started microphone %u.\n", mic->device_id);
return true;
}
static bool sdl_microphone_stop_mic(void *driver_context, void *mic_context)
{
sdl_microphone_t *sdl = (sdl_microphone_t*)driver_context;
sdl_microphone_handle_t *mic = (sdl_microphone_handle_t*)mic_context;
if (!sdl || !mic)
return false;
SDL_PauseAudioDevice(mic->device_id, true);
switch (SDL_GetAudioDeviceStatus(mic->device_id))
{
case SDL_AUDIO_PLAYING:
RARCH_ERR("[SDL mic] Microphone %u failed to pause.\n", mic->device_id);
return false;
case SDL_AUDIO_STOPPED:
RARCH_WARN("[SDL mic] Microphone %u is in state STOPPED; it may not start again.\n",
mic->device_id);
/* fall-through */
case SDL_AUDIO_PAUSED:
break;
default:
RARCH_ERR("[SDL mic] Microphone %u is in unknown state.\n",
mic->device_id);
return false;
}
return true;
}
static void sdl_microphone_set_nonblock_state(void *driver_context, bool state)
{
sdl_microphone_t *sdl = (sdl_microphone_t*)driver_context;
if (sdl)
sdl->nonblock = state;
}
static int sdl_microphone_read(void *driver_context, void *mic_context, void *s, size_t len)
{
int ret = 0;
sdl_microphone_t *sdl = (sdl_microphone_t*)driver_context;
sdl_microphone_handle_t *mic = (sdl_microphone_handle_t*)mic_context;
if (!sdl || !mic || !s)
return -1;
/* If we shouldn't block on an empty queue... */
if (sdl->nonblock)
{
size_t avail, read_amt;
SDL_LockAudioDevice(mic->device_id); /* Stop the SDL mic thread */
avail = FIFO_READ_AVAIL(mic->sample_buffer);
read_amt = avail > len ? len : avail;
if (read_amt > 0)
{ /* If the incoming queue isn't empty... */
fifo_read(mic->sample_buffer, s, read_amt);
/* ...then read as much data as will fit in buf */
}
SDL_UnlockAudioDevice(mic->device_id); /* Let the mic thread run again */
ret = (int)read_amt;
}
else
{
size_t read = 0;
/* Until we've given the caller as much data as they've asked for... */
while (read < len)
{
size_t avail;
SDL_LockAudioDevice(mic->device_id);
/* Stop the SDL microphone thread from running */
avail = FIFO_READ_AVAIL(mic->sample_buffer);
if (avail == 0)
{ /* If the incoming sample queue is empty... */
SDL_UnlockAudioDevice(mic->device_id);
/* Let the SDL microphone thread run so it can
* push some incoming samples */
#ifdef HAVE_THREADS
slock_lock(mic->lock);
/* Let *only* the SDL microphone thread access
* the incoming sample queue. */
scond_wait(mic->cond, mic->lock);
/* Wait until the SDL microphone thread tells us
* it's added some samples. */
slock_unlock(mic->lock);
/* Allow this thread to access the incoming sample queue,
* which we'll do next iteration */
#endif
}
else
{
size_t read_amt = MIN(len - read, avail);
fifo_read(mic->sample_buffer, s + read, read_amt);
/* Read as many samples as we have available without
* underflowing the queue */
SDL_UnlockAudioDevice(mic->device_id);
/* Let the SDL microphone thread run again */
read += read_amt;
}
}
ret = (int)read;
}
return ret;
}
static bool sdl_microphone_mic_use_float(const void *driver_context, const void *mic_context)
{
sdl_microphone_handle_t *mic = (sdl_microphone_handle_t*)mic_context;
return SDL_AUDIO_ISFLOAT(mic->device_spec.format);
}
microphone_driver_t microphone_sdl = {
sdl_microphone_init,
sdl_microphone_free,
sdl_microphone_read,
sdl_microphone_set_nonblock_state,
"sdl2",
NULL,
NULL,
sdl_microphone_open_mic,
sdl_microphone_close_mic,
sdl_microphone_mic_alive,
sdl_microphone_start_mic,
sdl_microphone_stop_mic,
sdl_microphone_mic_use_float,
};
#endif
#else
typedef Uint32 SDL_AudioDeviceID;
/** Compatibility stub that defers to SDL_PauseAudio. */
#define SDL_PauseAudioDevice(dev, pause_on) SDL_PauseAudio(pause_on)
/** Compatibility stub that defers to SDL_LockAudio. */
#define SDL_LockAudioDevice(dev) SDL_LockAudio()
/** Compatibility stub that defers to SDL_UnlockAudio. */
#define SDL_UnlockAudioDevice(dev) SDL_UnlockAudio()
/** Compatibility stub that defers to SDL_CloseAudio. */
#define SDL_CloseAudioDevice(dev) SDL_CloseAudio()
/* Macros for checking audio format bits that were introduced in SDL 2 */
#define SDL_AUDIO_MASK_BITSIZE (0xFF)
#define SDL_AUDIO_MASK_DATATYPE (1<<8)
#define SDL_AUDIO_MASK_ENDIAN (1<<12)
#define SDL_AUDIO_MASK_SIGNED (1<<15)
#define SDL_AUDIO_BITSIZE(x) (x & SDL_AUDIO_MASK_BITSIZE)
#define SDL_AUDIO_ISFLOAT(x) (x & SDL_AUDIO_MASK_DATATYPE)
#define SDL_AUDIO_ISBIGENDIAN(x) (x & SDL_AUDIO_MASK_ENDIAN)
#define SDL_AUDIO_ISSIGNED(x) (x & SDL_AUDIO_MASK_SIGNED)
#define SDL_AUDIO_ISINT(x) (!SDL_AUDIO_ISFLOAT(x))
#define SDL_AUDIO_ISLITTLEENDIAN(x) (!SDL_AUDIO_ISBIGENDIAN(x))
#define SDL_AUDIO_ISUNSIGNED(x) (!SDL_AUDIO_ISSIGNED(x))
#endif
typedef struct sdl_audio
{
#ifdef HAVE_THREADS
slock_t *lock;
scond_t *cond;
#endif
/**
* The queue used to store outgoing samples to be played by the driver.
* Audio from the core ultimately makes its way here,
* the last stop before the driver plays it.
*/
fifo_buffer_t *speaker_buffer;
bool nonblock;
bool is_paused;
SDL_AudioDeviceID speaker_device;
} sdl_audio_t;
static void sdl_audio_playback_cb(void *data, Uint8 *stream, int len)
{
sdl_audio_t *sdl = (sdl_audio_t*)data;
size_t avail = FIFO_READ_AVAIL(sdl->speaker_buffer);
size_t _len = (len > (int)avail) ? avail : (size_t)len;
fifo_read(sdl->speaker_buffer, stream, _len);
#ifdef HAVE_THREADS
scond_signal(sdl->cond);
#endif
/* If underrun, fill rest with silence. */
memset(stream + _len, 0, len - _len);
}
static INLINE int sdl_audio_find_num_frames(int rate, int latency)
{
int frames = (rate * latency) / 1000;
/* SDL only likes 2^n sized buffers. */
return next_pow2(frames);
}
static void *sdl_audio_init(const char *device,
unsigned rate, unsigned latency,
unsigned block_frames, unsigned *new_rate)
{
int frames;
size_t bufsize;
SDL_AudioSpec out;
SDL_AudioSpec spec = {0};
void *tmp = NULL;
sdl_audio_t *sdl = NULL;
uint32_t sdl_subsystem_flags = SDL_WasInit(0);
/* Initialise audio subsystem, if required */
if (sdl_subsystem_flags == 0)
{
if (SDL_Init(SDL_INIT_AUDIO) < 0)
return NULL;
}
else if ((sdl_subsystem_flags & SDL_INIT_AUDIO) == 0)
{
if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0)
return NULL;
}
sdl = (sdl_audio_t*)calloc(1, sizeof(*sdl));
if (!sdl)
return NULL;
/* We have to buffer up some data ourselves, so we let SDL
* carry approximately half of the latency.
*
* SDL double buffers audio and we do as well. */
frames = sdl_audio_find_num_frames(rate, latency / 4);
/* First, let's initialize the output device. */
spec.freq = rate;
spec.format = AUDIO_S16SYS;
spec.channels = 2;
spec.samples = frames; /* This is in audio frames, not samples ... :( */
spec.callback = sdl_audio_playback_cb;
spec.userdata = sdl;
/* No compatibility stub for SDL_OpenAudioDevice because its return value
* is different from that of SDL_OpenAudio. */
#ifdef HAVE_SDL2
sdl->speaker_device = SDL_OpenAudioDevice(NULL, false, &spec, &out, 0);
if (sdl->speaker_device == 0)
#else
sdl->speaker_device = SDL_OpenAudio(&spec, &out);
if (sdl->speaker_device < 0)
#endif
{
RARCH_ERR("[SDL audio] Failed to open SDL audio output device: %s.\n", SDL_GetError());
goto error;
}
*new_rate = out.freq;
RARCH_DBG("[SDL audio] Opened SDL audio out device with ID %u.\n",
sdl->speaker_device);
RARCH_DBG("[SDL audio] Requested a speaker frequency of %u Hz, got %u Hz.\n",
spec.freq, out.freq);
RARCH_DBG("[SDL audio] Requested %u channels for speaker, got %u.\n",
spec.channels, out.channels);
RARCH_DBG("[SDL audio] Requested a %u-frame speaker buffer, got %u frames (%u bytes).\n",
frames, out.samples, out.size);
RARCH_DBG("[SDL audio] Got a speaker silence value of %u.\n", out.silence);
RARCH_DBG("[SDL audio] Requested speaker audio format: %u-bit %s %s %s endian.\n",
SDL_AUDIO_BITSIZE(spec.format),
SDL_AUDIO_ISSIGNED(spec.format) ? "signed" : "unsigned",
SDL_AUDIO_ISFLOAT(spec.format) ? "floating-point" : "integer",
SDL_AUDIO_ISBIGENDIAN(spec.format) ? "big" : "little");
RARCH_DBG("[SDL audio] Received speaker audio format: %u-bit %s %s %s endian.\n",
SDL_AUDIO_BITSIZE(spec.format),
SDL_AUDIO_ISSIGNED(spec.format) ? "signed" : "unsigned",
SDL_AUDIO_ISFLOAT(spec.format) ? "floating-point" : "integer",
SDL_AUDIO_ISBIGENDIAN(spec.format) ? "big" : "little");
#ifdef HAVE_THREADS
sdl->lock = slock_new();
sdl->cond = scond_new();
#endif
RARCH_LOG("[SDL audio] Requested %u ms latency for output device, got %d ms.\n",
latency, (int)(out.samples * 4 * 1000 / (*new_rate)));
/* Create a buffer twice as big as needed and prefill the buffer. */
bufsize = out.samples * 4 * sizeof(int16_t);
tmp = calloc(1, bufsize);
sdl->speaker_buffer = fifo_new(bufsize);
if (tmp)
{
fifo_write(sdl->speaker_buffer, tmp, bufsize);
free(tmp);
}
RARCH_DBG("[SDL audio] Initialized speaker sample queue with %u bytes.\n", bufsize);
SDL_PauseAudioDevice(sdl->speaker_device, false);
return sdl;
error:
free(sdl);
return NULL;
}
static ssize_t sdl_audio_write(void *data, const void *s, size_t len)
{
ssize_t ret = 0;
sdl_audio_t *sdl = (sdl_audio_t*)data;
/* If we shouldn't wait for space in a full outgoing sample queue... */
if (sdl->nonblock)
{
size_t avail, write_amt;
SDL_LockAudioDevice(sdl->speaker_device); /* Stop the SDL speaker thread from running */
avail = FIFO_WRITE_AVAIL(sdl->speaker_buffer);
write_amt = (avail > len) ? len : avail; /* Enqueue as much data as we can */
fifo_write(sdl->speaker_buffer, s, write_amt);
SDL_UnlockAudioDevice(sdl->speaker_device); /* Let the speaker thread run again */
ret = write_amt; /* If the queue was full...well, too bad. */
}
else
{
size_t written = 0;
/* Until we've written all the sample data we have available... */
while (written < len)
{
size_t avail;
/* Stop the SDL speaker thread from running */
SDL_LockAudioDevice(sdl->speaker_device);
avail = FIFO_WRITE_AVAIL(sdl->speaker_buffer);
/* If the outgoing sample queue is full... */
if (avail == 0)
{
SDL_UnlockAudioDevice(sdl->speaker_device);
/* Let the SDL speaker thread run so it can play the enqueued samples,
* which will free up space for us to write new ones. */
#ifdef HAVE_THREADS
slock_lock(sdl->lock);
/* Let *only* the SDL speaker thread touch the outgoing sample queue */
scond_wait(sdl->cond, sdl->lock);
/* Block until SDL tells us that it's made room for new samples */
slock_unlock(sdl->lock);
/* Now let this thread use the outgoing sample queue (which we'll do next iteration) */
#endif
}
else
{
size_t write_amt = len - written > avail ? avail : len - written;
fifo_write(sdl->speaker_buffer, (const char*)s + written, write_amt);
/* Enqueue as many samples as we have available without overflowing the queue */
SDL_UnlockAudioDevice(sdl->speaker_device); /* Let the SDL speaker thread run again */
written += write_amt;
}
}
ret = written;
}
return ret;
}
static bool sdl_audio_stop(void *data)
{
sdl_audio_t *sdl = (sdl_audio_t*)data;
sdl->is_paused = true;
SDL_PauseAudioDevice(sdl->speaker_device, true);
return true;
}
static bool sdl_audio_alive(void *data)
{
sdl_audio_t *sdl = (sdl_audio_t*)data;
if (!sdl)
return false;
return !sdl->is_paused;
}
static bool sdl_audio_start(void *data, bool is_shutdown)
{
sdl_audio_t *sdl = (sdl_audio_t*)data;
sdl->is_paused = false;
SDL_PauseAudioDevice(sdl->speaker_device, false);
return true;
}
static void sdl_audio_set_nonblock_state(void *data, bool state)
{
sdl_audio_t *sdl = (sdl_audio_t*)data;
if (sdl)
sdl->nonblock = state;
}
static void sdl_audio_free(void *data)
{
sdl_audio_t *sdl = (sdl_audio_t*)data;
if (sdl)
{
if (sdl->speaker_device > 0)
{
SDL_CloseAudioDevice(sdl->speaker_device);
}
if (sdl->speaker_buffer)
fifo_free(sdl->speaker_buffer);
#ifdef HAVE_THREADS
slock_free(sdl->lock);
scond_free(sdl->cond);
#endif
SDL_QuitSubSystem(SDL_INIT_AUDIO);
}
free(sdl);
}
/* TODO/FIXME - implement */
static bool sdl_audio_use_float(void *data) { return false; }
static size_t sdl_audio_write_avail(void *data) { return 0; }
audio_driver_t audio_sdl = {
sdl_audio_init,
sdl_audio_write,
sdl_audio_stop,
sdl_audio_start,
sdl_audio_alive,
sdl_audio_set_nonblock_state,
sdl_audio_free,
sdl_audio_use_float,
#ifdef HAVE_SDL2
"sdl2",
#else
"sdl",
#endif
NULL,
NULL,
sdl_audio_write_avail,
NULL
};
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