63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
|
|
#include "config.h"
|
|
|
|
#include "base.h"
|
|
|
|
#include <atomic>
|
|
#include <thread>
|
|
|
|
#include "AL/al.h"
|
|
|
|
#include "alcmain.h"
|
|
#include "alexcpt.h"
|
|
#include "alnumeric.h"
|
|
#include "atomic.h"
|
|
|
|
|
|
ClockLatency GetClockLatency(ALCdevice *device)
|
|
{
|
|
BackendBase *backend{device->Backend.get()};
|
|
ClockLatency ret{backend->getClockLatency()};
|
|
ret.Latency += device->FixedLatency;
|
|
return ret;
|
|
}
|
|
|
|
|
|
/* BackendBase method implementations. */
|
|
BackendBase::BackendBase(ALCdevice *device) noexcept : mDevice{device}
|
|
{ }
|
|
|
|
BackendBase::~BackendBase() = default;
|
|
|
|
bool BackendBase::reset()
|
|
{ throw al::backend_exception{ALC_INVALID_DEVICE, "Invalid BackendBase call"}; }
|
|
|
|
ALCenum BackendBase::captureSamples(al::byte*, ALCuint)
|
|
{ return ALC_INVALID_DEVICE; }
|
|
|
|
ALCuint BackendBase::availableSamples()
|
|
{ return 0; }
|
|
|
|
ClockLatency BackendBase::getClockLatency()
|
|
{
|
|
ClockLatency ret;
|
|
|
|
ALuint refcount;
|
|
do {
|
|
while(((refcount=ReadRef(mDevice->MixCount))&1) != 0)
|
|
std::this_thread::yield();
|
|
ret.ClockTime = GetDeviceClockTime(mDevice);
|
|
std::atomic_thread_fence(std::memory_order_acquire);
|
|
} while(refcount != ReadRef(mDevice->MixCount));
|
|
|
|
/* 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::max(std::chrono::seconds{mDevice->BufferSize-mDevice->UpdateSize},
|
|
std::chrono::seconds::zero());
|
|
ret.Latency /= mDevice->Frequency;
|
|
|
|
return ret;
|
|
}
|