blob: 021a0f1738faeeebf5f086bedf6c10cde738c263 (
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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
#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. */
ALCbackend::ALCbackend(ALCdevice *device) noexcept : mDevice{device}
{ }
ALCbackend::~ALCbackend()
{ }
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();
}
}
|
