blob: e37534267452e2fd247d18e83f2d6bf37c8f7ff0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
#include "config.h"
#include <stdlib.h>
#include <thread>
#include "alMain.h"
#include "alu.h"
#include "backends/base.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()
{ }
ALCboolean BackendBase::reset()
{ return ALC_FALSE; }
ALCenum BackendBase::captureSamples(void* UNUSED(buffer), ALCuint UNUSED(samples))
{ return ALC_INVALID_DEVICE; }
ALCuint BackendBase::availableSamples()
{ return 0; }
ClockLatency BackendBase::getClockLatency()
{
ClockLatency ret;
ALuint refcount;
do {
while(((refcount=mDevice->MixCount.load(std::memory_order_acquire))&1))
std::this_thread::yield();
ret.ClockTime = GetDeviceClockTime(mDevice);
std::atomic_thread_fence(std::memory_order_acquire);
} while(refcount != mDevice->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{mDevice->UpdateSize*maxi(mDevice->NumUpdates-1, 0)};
ret.Latency /= mDevice->Frequency;
return ret;
}
|
