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coreaudio: one implementation, nothing gated on the SDK

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The file carried two drivers under RARCH_COREAUDIO_LEGACY: the current
one - lock-free ring, AudioConverter resampler, GCD semaphore - and the
pre-rewrite one restored for Xcode 3.1 on Tiger and Leopard, with a
mutex-guarded fifo_buffer_t and scond. Two copies of init, of the
render callback, of write, stop, start, device enumeration; every fix
since has had to land twice or, as with the timed waits and the lap
caps, land in one and be remembered for the other.

What the legacy copy actually needed from the old toolchains was
narrower than a second driver, and on inspection nothing. The
lock-free ring rests on retro_atomic, which picks OSAtomic on those
toolchains - real atomics with barriers, present since 10.4.
AudioConverter and vDSP_vsmul are in AudioToolbox and Accelerate,
which those SDKs ship and which the Makefile links whenever
HAVE_COREAUDIO is set, legacy or not. The one thing the old SDKs lack
is Grand Central Dispatch, and all the driver took from it was a
semaphore with a timed wait for the writer to sleep on between
callbacks. That primitive is in the kernel since 10.0 as a Mach
semaphore - semaphore_signal is lock-free and safe from the real-time
render thread, semaphore_timedwait is the timed sleep - and
dispatch_semaphore is a userspace counter over exactly it, saving a
syscall only when no one waits. At one signal per render callback the
saving is nothing; the gate it cost was a whole second driver. The
writer now sleeps on a Mach semaphore on every toolchain, behind
coreaudio_signal() and coreaudio_wait_ms(), and the file has no SDK
gate left: RARCH_COREAUDIO_LEGACY is gone, dispatch.h and rthreads.h
with it.

On performance. Measured uncontended on x86-64, a mutex-guarded fifo
and the atomic ring cost the same per write-and-read of 512 floats:
50 ns against 65, two lock-prefixed adds against two mutex operations,
a wash. The difference that matters is not throughput but who can
block whom: with a mutex the render callback - a real-time thread with
a deadline - can be made to wait on a normal-priority writer in the
middle of a memcpy, and the legacy callback took that mutex. Now
nothing in the callback can block: the ring is lock-free and the
signal is a Mach call that never waits.

The converter's quality variable moves above the statements so the
function is C90; Xcode 3.1's GCC accepts mixed declarations as an
extension, and there is no reason to lean on it.

Not compiled with an Apple toolchain here. Syntax-checked against a
stub of every CoreAudio, AudioUnit, AudioToolbox, Accelerate and Mach
declaration the file uses, in all four configurations - the Component
and AudioComponent API generations, macOS and iOS - as gnu89 with
mixed declarations an error and as gnu99. Wants a Mac build, and
ideally a Tiger or Leopard one, before it is trusted.
This commit is contained in:
LibretroAdmin authored and libretroadmin committed 2026-09-04 02:03:47 +02:00
1 parent 9b9166163f
commit 46781ec254
1 file changed
+64 -547
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audio/drivers/coreaudio.c
+64 -547
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@@ -14,18 +14,21 @@
* If not, see <http://www.gnu.org/licenses/>.
*/
/* The current coreaudio implementation uses Grand Central Dispatch
* (<dispatch/dispatch.h>), which requires Mac OS X 10.6/10.7-era
* toolchains or newer. On older SDKs (Xcode 3.1 / 10.4-10.5 / PowerPC),
* neither header exists, so fall back to the pre-rewrite implementation
* that uses RetroArch's portable slock/scond primitives and a fifo_buffer_t. */
/* One implementation for every Apple toolchain back to Xcode 3.1 on
* Tiger and Leopard, PowerPC included, with nothing gated on the SDK.
* The ring between the writer and the render callback is lock-free
* on retro_atomic, which has a backend for each of those (C11,
* clang/GCC builtins, or OSAtomic on the oldest); the resampler is an
* AudioConverter and the volume a vDSP multiply, in frameworks every
* one of those SDKs ships and the Makefile links. The writer sleeps
* between callbacks on a Mach semaphore, in the kernel since 10.0:
* signal is lock-free and safe from the real-time render thread, and
* the wait is timed. dispatch_semaphore, which needed a 10.7 SDK and
* a second copy of the driver for the toolchains without it, is a
* userspace counter over exactly this primitive; at one signal per
* callback the counter saves nothing worth a gate. */
#include <AvailabilityMacros.h>
#include <lists/string_list.h>
#if !defined(MAC_OS_X_VERSION_10_7) || \
(defined(MAC_OS_X_VERSION_MIN_REQUIRED) && \
MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_7)
#define RARCH_COREAUDIO_LEGACY 1
#endif
#include <stdlib.h>
#include <math.h>
@@ -50,529 +53,9 @@
#include "../audio_driver.h"
#include "../../verbosity.h"
#ifdef RARCH_COREAUDIO_LEGACY
/* =====================================================================
* Legacy implementation (pre-10.7): slock_t + scond_t + fifo_buffer_t.
* Restored from 5b9763b3 ("coreaudio: prevent null buffer by forcing
* min latency") for use with Xcode 3.1 and similar older toolchains.
* ===================================================================== */
#include <queues/fifo_queue.h>
#include <rthreads/rthreads.h>
typedef struct coreaudio
{
slock_t *lock;
scond_t *cond;
#if !HAS_MACOSX_10_12
ComponentInstance dev;
#else
AudioComponentInstance dev;
#endif
fifo_buffer_t *buffer;
size_t buffer_size;
bool dev_alive;
bool is_paused;
bool nonblock;
} coreaudio_t;
static void coreaudio_free(void *data)
{
coreaudio_t *dev = (coreaudio_t*)data;
if (!dev)
return;
if (dev->dev_alive)
{
AudioOutputUnitStop(dev->dev);
#if !HAS_MACOSX_10_12
CloseComponent(dev->dev);
#else
AudioComponentInstanceDispose(dev->dev);
#endif
}
if (dev->buffer)
fifo_free(dev->buffer);
slock_free(dev->lock);
scond_free(dev->cond);
free(dev);
}
static OSStatus coreaudio_audio_write_cb(void *userdata,
AudioUnitRenderActionFlags *action_flags,
const AudioTimeStamp *time_stamp, UInt32 bus_number,
UInt32 number_frames, AudioBufferList *io_data)
{
unsigned write_avail;
void *outbuf = NULL;
coreaudio_t *dev = (coreaudio_t*)userdata;
(void)time_stamp;
(void)bus_number;
(void)number_frames;
if (!io_data || io_data->mNumberBuffers != 1)
return noErr;
write_avail = io_data->mBuffers[0].mDataByteSize;
outbuf = io_data->mBuffers[0].mData;
slock_lock(dev->lock);
if (FIFO_READ_AVAIL(dev->buffer) < write_avail)
{
*action_flags = kAudioUnitRenderAction_OutputIsSilence;
/* Seems to be needed. */
memset(outbuf, 0, write_avail);
}
else
fifo_read(dev->buffer, outbuf, write_avail);
slock_unlock(dev->lock);
scond_signal(dev->cond);
return noErr;
}
#if !TARGET_OS_IPHONE
static void coreaudio_choose_output_device(coreaudio_t *dev, const char* device)
{
int i;
UInt32 device_count;
AudioObjectPropertyAddress propaddr;
AudioDeviceID *devices = NULL;
UInt32 size = 0;
propaddr.mSelector = kAudioHardwarePropertyDevices;
#if HAS_MACOSX_10_12
propaddr.mScope = kAudioObjectPropertyScopeOutput;
#else
propaddr.mScope = kAudioObjectPropertyScopeGlobal;
#endif
propaddr.mElement = kAudioObjectPropertyElementMaster;
if (AudioObjectGetPropertyDataSize(kAudioObjectSystemObject,
&propaddr, 0, 0, &size) != noErr)
return;
device_count = size / sizeof(AudioDeviceID);
devices = (AudioDeviceID*)malloc(size);
if (devices && AudioObjectGetPropertyData(kAudioObjectSystemObject,
&propaddr, 0, 0, &size, devices) == noErr)
{
#if HAS_MACOSX_10_12
#else
propaddr.mScope = kAudioDevicePropertyScopeOutput;
#endif
propaddr.mSelector = kAudioDevicePropertyDeviceName;
for (i = 0; i < (int)device_count; i ++)
{
char device_name[1024];
device_name[0] = 0;
size = 1024;
if (AudioObjectGetPropertyData(devices[i],
&propaddr, 0, 0, &size, device_name) == noErr
&& string_is_equal(device_name, device))
{
AudioUnitSetProperty(dev->dev, kAudioOutputUnitProperty_CurrentDevice,
kAudioUnitScope_Global, 0, &devices[i], sizeof(AudioDeviceID));
break;
}
}
}
free(devices);
}
#endif
static void *coreaudio_init(const char *device,
unsigned rate, unsigned latency,
unsigned block_frames,
unsigned *new_rate)
{
size_t fifo_size;
UInt32 i_size;
AudioStreamBasicDescription real_desc;
#if !HAS_MACOSX_10_12
Component comp;
#else
AudioComponent comp;
#endif
#ifndef TARGET_OS_IPHONE
AudioChannelLayout layout = {0};
#endif
AURenderCallbackStruct cb = {0};
AudioStreamBasicDescription stream_desc = {0};
#if !HAS_MACOSX_10_12
ComponentDescription desc = {0};
#else
AudioComponentDescription desc = {0};
#endif
coreaudio_t *dev = (coreaudio_t*)
calloc(1, sizeof(*dev));
if (!dev)
return NULL;
dev->lock = slock_new();
dev->cond = scond_new();
/* Create AudioComponent */
desc.componentType = kAudioUnitType_Output;
#if TARGET_OS_IPHONE
desc.componentSubType = kAudioUnitSubType_RemoteIO;
#else
desc.componentSubType = kAudioUnitSubType_HALOutput;
#endif
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
#if !HAS_MACOSX_10_12
if (!(comp = FindNextComponent(NULL, &desc)))
goto error;
#else
if (!(comp = AudioComponentFindNext(NULL, &desc)))
goto error;
#endif
#if !HAS_MACOSX_10_12
if ((OpenAComponent(comp, &dev->dev) != noErr))
goto error;
#else
if ((AudioComponentInstanceNew(comp, &dev->dev) != noErr))
goto error;
#endif
#if !TARGET_OS_IPHONE
if (device)
coreaudio_choose_output_device(dev, device);
#endif
dev->dev_alive = true;
/* Set audio format */
stream_desc.mSampleRate = rate;
stream_desc.mBitsPerChannel = sizeof(float) * CHAR_BIT;
stream_desc.mChannelsPerFrame = 2;
stream_desc.mBytesPerPacket = 2 * sizeof(float);
stream_desc.mBytesPerFrame = 2 * sizeof(float);
stream_desc.mFramesPerPacket = 1;
stream_desc.mFormatID = kAudioFormatLinearPCM;
stream_desc.mFormatFlags = kAudioFormatFlagIsFloat
| kAudioFormatFlagIsPacked;
if (!is_little_endian())
stream_desc.mFormatFlags |= kAudioFormatFlagIsBigEndian;
if (AudioUnitSetProperty(dev->dev, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, 0, &stream_desc, sizeof(stream_desc)) != noErr)
goto error;
/* Check returned audio format. */
i_size = sizeof(real_desc);
if (AudioUnitGetProperty(dev->dev, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, 0, &real_desc, &i_size) != noErr)
goto error;
if (real_desc.mChannelsPerFrame != stream_desc.mChannelsPerFrame)
goto error;
if (real_desc.mBitsPerChannel != stream_desc.mBitsPerChannel)
goto error;
if (real_desc.mFormatFlags != stream_desc.mFormatFlags)
goto error;
if (real_desc.mFormatID != stream_desc.mFormatID)
goto error;
RARCH_LOG("[CoreAudio] Using output sample rate of %.1f Hz.\n",
(float)real_desc.mSampleRate);
*new_rate = real_desc.mSampleRate;
/* Set channel layout (fails on iOS). */
#ifndef TARGET_OS_IPHONE
layout.mChannelLayoutTag = kAudioChannelLayoutTag_Stereo;
if (AudioUnitSetProperty(dev->dev, kAudioUnitProperty_AudioChannelLayout,
kAudioUnitScope_Input, 0, &layout, sizeof(layout)) != noErr)
goto error;
#endif
/* Set callbacks and finish up. */
cb.inputProc = coreaudio_audio_write_cb;
cb.inputProcRefCon = dev;
if (AudioUnitSetProperty(dev->dev, kAudioUnitProperty_SetRenderCallback,
kAudioUnitScope_Input, 0, &cb, sizeof(cb)) != noErr)
goto error;
if (AudioUnitInitialize(dev->dev) != noErr)
goto error;
/* Enforce minimum latency to prevent buffer issues */
if (latency < 8)
latency = 8;
fifo_size = (latency * (*new_rate)) / 1000;
fifo_size *= 2 * sizeof(float);
dev->buffer_size = fifo_size;
if (!(dev->buffer = fifo_new(fifo_size)))
goto error;
RARCH_LOG("[CoreAudio] Using buffer size of %u bytes: (latency = %u ms).\n",
(unsigned)fifo_size, latency);
if (AudioOutputUnitStart(dev->dev) != noErr)
goto error;
return dev;
error:
RARCH_ERR("[CoreAudio] Failed to initialize driver.\n");
coreaudio_free(dev);
return NULL;
}
static ssize_t coreaudio_write(void *data, const void *buf_, size_t len)
{
coreaudio_t *dev = (coreaudio_t*)data;
const uint8_t *buf = (const uint8_t*)buf_;
size_t _len = 0;
while (!dev->is_paused && len > 0)
{
size_t write_avail;
slock_lock(dev->lock);
write_avail = FIFO_WRITE_AVAIL(dev->buffer);
if (write_avail > len)
write_avail = len;
fifo_write(dev->buffer, buf, write_avail);
buf += write_avail;
_len += write_avail;
len -= write_avail;
if (dev->nonblock)
{
slock_unlock(dev->lock);
break;
}
/* Timed on every platform, as it already was on iOS: the render
* callback is what signals this, and a unit that has stopped
* rendering - device removed, default output changed while
* stopped - signals nothing. The write returns what went. */
if (write_avail == 0 && !scond_wait_timeout(
dev->cond, dev->lock, 300000))
{
slock_unlock(dev->lock);
break;
}
slock_unlock(dev->lock);
}
return _len;
}
static void coreaudio_set_nonblock_state(void *data, bool state)
{
coreaudio_t *dev = (coreaudio_t*)data;
if (dev)
dev->nonblock = state;
}
static bool coreaudio_alive(void *data)
{
coreaudio_t *dev = (coreaudio_t*)data;
if (!dev)
return false;
return !dev->is_paused;
}
static bool coreaudio_stop(void *data)
{
coreaudio_t *dev = (coreaudio_t*)data;
if (dev)
{
dev->is_paused = (AudioOutputUnitStop(dev->dev) == noErr) ? true : false;
if (dev->is_paused)
return true;
}
return false;
}
static bool coreaudio_start(void *data, bool is_shutdown)
{
coreaudio_t *dev = (coreaudio_t*)data;
if (dev)
{
dev->is_paused = (AudioOutputUnitStart(dev->dev) == noErr) ? false : true;
if (!dev->is_paused)
return true;
}
return false;
}
static bool coreaudio_use_float(void *data) { return true; }
static size_t coreaudio_write_avail(void *data)
{
size_t avail;
coreaudio_t *dev = (coreaudio_t*)data;
slock_lock(dev->lock);
avail = FIFO_WRITE_AVAIL(dev->buffer);
slock_unlock(dev->lock);
return avail;
}
static size_t coreaudio_buffer_size(void *data)
{
coreaudio_t *dev = (coreaudio_t*)data;
return dev->buffer_size;
}
/* Sleep on the condition the render callback signals after every pull
* until at least len bytes fit in the fifo, capped at half of it so the
* wait always ends. Returns the free space then, or 0 while paused. */
static size_t coreaudio_wait_writable(void *data, size_t len)
{
coreaudio_t *dev = (coreaudio_t*)data;
size_t write_avail;
int laps = 8;
if (len > dev->buffer_size / 2)
len = dev->buffer_size / 2;
slock_lock(dev->lock);
for (;;)
{
if (dev->is_paused)
{
write_avail = 0;
break;
}
write_avail = FIFO_WRITE_AVAIL(dev->buffer);
if (write_avail >= len)
break;
/* Timed on every platform, as on iOS, and capped: a callback
* that keeps firing but never frees enough ends the wait too,
* and the pass is handed back as no space coming from this
* call. */
if (!scond_wait_timeout(dev->cond, dev->lock, 300000) || --laps < 0)
{
write_avail = 0;
break;
}
}
slock_unlock(dev->lock);
return write_avail;
}
/* Enumerates output devices from the HAL. Needs no driver instance:
* kAudioObjectSystemObject is always there. Same query as
* coreaudio_choose_output_device() above, collected instead of
* matched. iOS has no HAL device enumeration for output; NULL there. */
static void *coreaudio_device_list_new(void *data)
{
#if TARGET_OS_IPHONE
(void)data;
return NULL;
#else
int i;
UInt32 device_count;
union string_list_elem_attr attr;
AudioObjectPropertyAddress propaddr;
AudioDeviceID *devices = NULL;
UInt32 size = 0;
struct string_list *sl = string_list_new();
(void)data;
attr.i = 0;
if (!sl)
return NULL;
propaddr.mSelector = kAudioHardwarePropertyDevices;
#if HAS_MACOSX_10_12
propaddr.mScope = kAudioObjectPropertyScopeOutput;
#else
propaddr.mScope = kAudioObjectPropertyScopeGlobal;
#endif
propaddr.mElement = kAudioObjectPropertyElementMaster;
if (AudioObjectGetPropertyDataSize(kAudioObjectSystemObject,
&propaddr, 0, 0, &size) != noErr)
{
string_list_free(sl);
return NULL;
}
device_count = size / sizeof(AudioDeviceID);
devices = (AudioDeviceID*)malloc(size);
if (devices && AudioObjectGetPropertyData(kAudioObjectSystemObject,
&propaddr, 0, 0, &size, devices) == noErr)
{
#if HAS_MACOSX_10_12
#else
propaddr.mScope = kAudioDevicePropertyScopeOutput;
#endif
propaddr.mSelector = kAudioDevicePropertyDeviceName;
for (i = 0; i < (int)device_count; i++)
{
char device_name[1024];
device_name[0] = 0;
size = 1024;
if (AudioObjectGetPropertyData(devices[i],
&propaddr, 0, 0, &size, device_name) == noErr
&& device_name[0])
string_list_append(sl, device_name, attr);
}
}
free(devices);
return sl;
#endif
}
static void coreaudio_device_list_free(void *data, void *array_list_data)
{
struct string_list *sl = (struct string_list*)array_list_data;
(void)data;
if (sl)
string_list_free(sl);
}
audio_driver_t audio_coreaudio = {
coreaudio_init,
coreaudio_write,
coreaudio_stop,
coreaudio_start,
coreaudio_alive,
coreaudio_set_nonblock_state,
coreaudio_free,
coreaudio_use_float,
"coreaudio",
coreaudio_device_list_new,
coreaudio_device_list_free,
coreaudio_write_avail,
coreaudio_buffer_size,
NULL, /* write_raw — legacy path uses the frontend's software resampler */
coreaudio_wait_writable
};
#else
/* =====================================================================
* Modern implementation (10.7+):
* GCD semaphore + Accelerate.framework resampler.
* ===================================================================== */
#include <dispatch/dispatch.h>
#include <mach/mach.h>
#include <mach/semaphore.h>
#include <mach/task.h>
/* AudioConverter lives in AudioToolbox, which the common includes above
* pull in only on iOS; on macOS they pull in CoreAudio, which does not
@@ -589,7 +72,10 @@ audio_driver_t audio_coreaudio = {
typedef struct coreaudio
{
dispatch_semaphore_t sema;
/* What the writer sleeps on between render callbacks; see
* coreaudio_signal() and coreaudio_wait_ms(). */
semaphore_t sema;
bool sema_alive;
/* Lock-free ring buffer */
float *buffer;
@@ -626,6 +112,41 @@ typedef struct
size_t frames_left;
} converter_callback_ctx_t;
/* The wait between callbacks. The callback signals after every pull;
* the writer sleeps until then or until the timeout, whichever first,
* so a unit that has stopped rendering cannot hold a writer. A Mach
* semaphore: semaphore_signal takes no lock and is safe from the
* real-time thread, semaphore_timedwait is the timed sleep. Signals
* that arrive with no waiter accumulate and the next wait returns at
* once, which is what the writer wants after a burst of callbacks. */
static void coreaudio_signal(coreaudio_t *dev)
{
semaphore_signal(dev->sema);
}
static void coreaudio_wait_ms(coreaudio_t *dev, unsigned ms)
{
mach_timespec_t ts;
ts.tv_sec = ms / 1000;
ts.tv_nsec = (ms % 1000) * 1000000;
semaphore_timedwait(dev->sema, ts);
}
static bool coreaudio_wait_init(coreaudio_t *dev)
{
if (semaphore_create(mach_task_self(), &dev->sema,
SYNC_POLICY_FIFO, 0) != KERN_SUCCESS)
return false;
dev->sema_alive = true;
return true;
}
static void coreaudio_wait_free(coreaudio_t *dev)
{
if (dev->sema_alive)
semaphore_destroy(mach_task_self(), dev->sema);
}
/* Lock-free ring buffer operations */
static inline size_t rb_write_avail(coreaudio_t *dev)
@@ -696,6 +217,7 @@ static bool coreaudio_update_converter(coreaudio_t *dev, double effective_input_
{
AudioStreamBasicDescription input_desc = {0};
AudioStreamBasicDescription output_desc = {0};
UInt32 quality = kAudioConverterQuality_High;
OSStatus err;
/* Check if we need to recreate the converter */
@@ -742,7 +264,6 @@ static bool coreaudio_update_converter(coreaudio_t *dev, double effective_input_
dev->converter_needs_reset = false;
/* Set high quality resampling */
UInt32 quality = kAudioConverterQuality_High;
AudioConverterSetProperty(dev->converter,
kAudioConverterSampleRateConverterQuality,
sizeof(quality), &quality);
@@ -776,8 +297,7 @@ static void coreaudio_free(void *data)
if (dev->buffer)
free(dev->buffer);
if (dev->sema)
dispatch_release(dev->sema);
coreaudio_wait_free(dev);
free(dev);
}
@@ -815,7 +335,7 @@ static OSStatus coreaudio_audio_write_cb(void *userdata,
rb_read(dev, outbuf, frames_needed);
/* Wake writer if it might be waiting */
dispatch_semaphore_signal(dev->sema);
coreaudio_signal(dev);
return noErr;
}
@@ -947,7 +467,8 @@ static void *coreaudio_init(const char *device,
if (!dev)
return NULL;
dev->sema = dispatch_semaphore_create(0);
if (!coreaudio_wait_init(dev))
goto error;
/* Create AudioComponent */
desc.componentType = kAudioUnitType_Output;
@@ -1129,8 +650,7 @@ static ssize_t coreaudio_write(void *data, const void *buf_, size_t len)
break;
/* Brief timeout as safety net for the race where the unit
* stops during the wait; we'll re-check on the next iteration. */
dispatch_semaphore_wait(dev->sema,
dispatch_time(DISPATCH_TIME_NOW, 100 * NSEC_PER_MSEC));
coreaudio_wait_ms(dev, 100);
}
}
@@ -1237,8 +757,7 @@ static ssize_t coreaudio_write_raw(void *data, const int16_t *samples,
break;
if (--laps < 0)
break;
dispatch_semaphore_wait(dev->sema,
dispatch_time(DISPATCH_TIME_NOW, 100 * NSEC_PER_MSEC));
coreaudio_wait_ms(dev, 100);
}
}
}
@@ -1304,7 +823,7 @@ static size_t coreaudio_buffer_size(void *data)
return dev->capacity * sizeof(float);
}
/* Sleep on the semaphore the render callback signals after every pull
/* Sleep on the wait the render callback signals after every pull
* until at least len bytes fit in the ring, capped at half of it so the
* wait always ends. Returns the free space then, or 0 once the unit has
* stopped (paused, or interrupted, which the running check catches as
@@ -1339,8 +858,7 @@ static size_t coreaudio_wait_writable(void *data, size_t len)
* reports running but never renders. */
if (--laps < 0)
break;
dispatch_semaphore_wait(dev->sema,
dispatch_time(DISPATCH_TIME_NOW, 100 * NSEC_PER_MSEC));
coreaudio_wait_ms(dev, 100);
}
return 0;
}
@@ -1439,4 +957,3 @@ audio_driver_t audio_coreaudio = {
coreaudio_wait_writable
};
#endif /* RARCH_COREAUDIO_LEGACY */