mirror of
https://github.com/mpv-player/mpv.git
synced 2024-09-20 20:03:10 +02:00
a27d402f37
Allows higher resolution sleeps than Sleep which has milliseconds resolution. In practice Windows kernel does not really go below 0.5ms, but we don't have to limit ourselves on API side of things and do the best we can.
142 lines
3.9 KiB
C
142 lines
3.9 KiB
C
/*
|
|
* This file is part of mpv.
|
|
*
|
|
* mpv is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* mpv is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <windows.h>
|
|
#include <sys/time.h>
|
|
#include <mmsystem.h>
|
|
#include <stdlib.h>
|
|
#include <versionhelpers.h>
|
|
|
|
#include "timer.h"
|
|
|
|
#include "config.h"
|
|
|
|
static LARGE_INTEGER perf_freq;
|
|
|
|
// ms values
|
|
static int hires_max = 50;
|
|
static int hires_res = 1;
|
|
|
|
int mp_start_hires_timers(int wait_ms)
|
|
{
|
|
#if !HAVE_UWP
|
|
// policy: request hires_res ms resolution if wait < hires_max ms
|
|
if (wait_ms > 0 && wait_ms <= hires_max &&
|
|
timeBeginPeriod(hires_res) == TIMERR_NOERROR)
|
|
{
|
|
return hires_res;
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
void mp_end_hires_timers(int res_ms)
|
|
{
|
|
#if !HAVE_UWP
|
|
if (res_ms > 0)
|
|
timeEndPeriod(res_ms);
|
|
#endif
|
|
}
|
|
|
|
void mp_sleep_ns(int64_t ns)
|
|
{
|
|
if (ns < 0)
|
|
return;
|
|
|
|
int hrt = mp_start_hires_timers(ns < 1e6 ? 1 : ns / 1e6);
|
|
|
|
#ifndef CREATE_WAITABLE_TIMER_HIGH_RESOLUTION
|
|
#define CREATE_WAITABLE_TIMER_HIGH_RESOLUTION 0x2
|
|
#endif
|
|
|
|
HANDLE timer = CreateWaitableTimerEx(NULL, NULL,
|
|
CREATE_WAITABLE_TIMER_HIGH_RESOLUTION,
|
|
TIMER_ALL_ACCESS);
|
|
|
|
// CREATE_WAITABLE_TIMER_HIGH_RESOLUTION is supported in Windows 10 1803+,
|
|
// retry without it.
|
|
if (!timer)
|
|
timer = CreateWaitableTimerEx(NULL, NULL, 0, TIMER_ALL_ACCESS);
|
|
|
|
if (!timer)
|
|
goto end;
|
|
|
|
// Time is expected in 100 nanosecond intervals.
|
|
// Negative values indicate relative time.
|
|
LARGE_INTEGER time = (LARGE_INTEGER){ .QuadPart = -(ns / 100) };
|
|
if (!SetWaitableTimer(timer, &time, 0, NULL, NULL, 0))
|
|
goto end;
|
|
|
|
if (WaitForSingleObject(timer, INFINITE) != WAIT_OBJECT_0)
|
|
goto end;
|
|
|
|
end:
|
|
if (timer)
|
|
CloseHandle(timer);
|
|
mp_end_hires_timers(hrt);
|
|
}
|
|
|
|
uint64_t mp_raw_time_ns(void)
|
|
{
|
|
LARGE_INTEGER perf_count;
|
|
QueryPerformanceCounter(&perf_count);
|
|
|
|
// Convert QPC units (1/perf_freq seconds) to nanoseconds. This will work
|
|
// without overflow because the QPC value is guaranteed not to roll-over
|
|
// within 100 years, so perf_freq must be less than 2.9*10^9.
|
|
return perf_count.QuadPart / perf_freq.QuadPart * UINT64_C(1000000000) +
|
|
perf_count.QuadPart % perf_freq.QuadPart * UINT64_C(1000000000) / perf_freq.QuadPart;
|
|
}
|
|
|
|
void mp_raw_time_init(void)
|
|
{
|
|
QueryPerformanceFrequency(&perf_freq);
|
|
|
|
#if !HAVE_UWP
|
|
// allow (undocumented) control of all the High Res Timers parameters,
|
|
// for easier experimentation and diagnostic of bug reports.
|
|
const char *v;
|
|
|
|
// 1..1000 ms max timetout for hires (used in "perwait" mode)
|
|
if ((v = getenv("MPV_HRT_MAX"))) {
|
|
int hmax = atoi(v);
|
|
if (hmax >= 1 && hmax <= 1000)
|
|
hires_max = hmax;
|
|
}
|
|
|
|
// 1..15 ms hires resolution (not used in "never" mode)
|
|
if ((v = getenv("MPV_HRT_RES"))) {
|
|
int res = atoi(v);
|
|
if (res >= 1 && res <= 15)
|
|
hires_res = res;
|
|
}
|
|
|
|
// "always"/"never"/"perwait" (or "auto" - same as unset)
|
|
if (!(v = getenv("MPV_HRT")) || !strcmp(v, "auto"))
|
|
v = IsWindows10OrGreater() ? "perwait" : "always";
|
|
|
|
if (!strcmp(v, "perwait")) {
|
|
// no-op, already per-wait
|
|
} else if (!strcmp(v, "never")) {
|
|
hires_max = 0;
|
|
} else { // "always" or unknown value
|
|
hires_max = 0;
|
|
timeBeginPeriod(hires_res);
|
|
}
|
|
#endif
|
|
}
|