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#include "config.h"
#include <stdlib.h>
#include <thread>
#include "alMain.h"
#include "alu.h"
#include "backends/base.h"
void ALCdevice_Lock(ALCdevice *device)
{ V0(device->Backend,lock)(); }
void ALCdevice_Unlock(ALCdevice *device)
{ V0(device->Backend,unlock)(); }
ClockLatency GetClockLatency(ALCdevice *device)
{
ClockLatency ret = V0(device->Backend,getClockLatency)();
ret.Latency += device->FixedLatency;
return ret;
}
/* Base ALCbackend method implementations. */
void ALCbackend_Construct(ALCbackend *self, ALCdevice *device)
{
self->mDevice = device;
}
void ALCbackend_Destruct(ALCbackend* UNUSED(self))
{
}
ALCboolean ALCbackend_reset(ALCbackend* UNUSED(self))
{
return ALC_FALSE;
}
ALCenum ALCbackend_captureSamples(ALCbackend* UNUSED(self), void* UNUSED(buffer), ALCuint UNUSED(samples))
{
return ALC_INVALID_DEVICE;
}
ALCuint ALCbackend_availableSamples(ALCbackend* UNUSED(self))
{
return 0;
}
ClockLatency ALCbackend_getClockLatency(ALCbackend *self)
{
ALCdevice *device = self->mDevice;
ALuint refcount;
ClockLatency ret;
do {
while(((refcount=device->MixCount.load(std::memory_order_acquire))&1))
std::this_thread::yield();
ret.ClockTime = GetDeviceClockTime(device);
std::atomic_thread_fence(std::memory_order_acquire);
} while(refcount != device->MixCount.load(std::memory_order_relaxed));
/* NOTE: The device will generally have about all but one periods filled at
* any given time during playback. Without a more accurate measurement from
* the output, this is an okay approximation.
*/
ret.Latency = std::chrono::seconds{device->UpdateSize*maxi(device->NumUpdates-1, 0)};
ret.Latency /= device->Frequency;
return ret;
}
void ALCbackend_lock(ALCbackend *self)
{
try {
self->mMutex.lock();
}
catch(...) {
std::terminate();
}
}
void ALCbackend_unlock(ALCbackend *self)
{
try {
self->mMutex.unlock();
}
catch(...) {
std::terminate();
}
}
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