mirror of
https://github.com/mpv-player/mpv.git
synced 2024-09-20 20:03:10 +02:00
930b483a68
Before this commit, timeBeginPeriod(1) was set once when mpv starts, and the timers remained hi-res till mpv exits. Now we do the same as before on Windows version < 10. On Windows 10+ we now use timeBeginPeriod if needed, per timeout. To force a mode regardless of Windows version, set env MPV_HRT: - "always": the old behavior - hires timers as long as mpv runs. - "perwait": sets 1ms timer resolution if timeout <= 50ms. - "never": don't use timeBeginPeriod at all. It was observed that on Windows 10 we lose about 0.5ms accuracy of timeouts with "perwait" mode (acceptable), but otherwise it works well for continuous timeouts (one after the other) and random ones. On Windows 7 with "perwait": continous timeouts are accurate, but random timeouts (after some time without timeouts) have bad accuracy - roughly 16ms resolution instead of the requested 1ms. Windows 8 was not tested, so to err on the side of caution, we keep the legacy behavior "always" by default.
118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <windows.h>
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#include <sys/time.h>
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#include <mmsystem.h>
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#include <stdlib.h>
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#include <versionhelpers.h>
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#include "timer.h"
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#include "config.h"
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static LARGE_INTEGER perf_freq;
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// ms values
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static int hires_max = 50;
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static int hires_res = 1;
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int mp_start_hires_timers(int wait_ms)
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{
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#if !HAVE_UWP
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// policy: request hires_res ms resolution if wait < hires_max ms
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if (wait_ms > 0 && wait_ms <= hires_max &&
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timeBeginPeriod(hires_res) == TIMERR_NOERROR)
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{
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return hires_res;
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}
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#endif
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return 0;
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}
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void mp_end_hires_timers(int res_ms)
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{
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#if !HAVE_UWP
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if (res_ms > 0)
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timeEndPeriod(res_ms);
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#endif
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}
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void mp_sleep_us(int64_t us)
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{
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if (us < 0)
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return;
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// Sleep(0) won't sleep for one clocktick as the unix usleep
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// instead it will only make the thread ready
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// it may take some time until it actually starts to run again
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if (us < 1000)
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us = 1000;
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int hrt = mp_start_hires_timers(us / 1000);
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Sleep(us / 1000);
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mp_end_hires_timers(hrt);
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}
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uint64_t mp_raw_time_us(void)
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{
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LARGE_INTEGER perf_count;
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QueryPerformanceCounter(&perf_count);
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// Convert QPC units (1/perf_freq seconds) to microseconds. This will work
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// without overflow because the QPC value is guaranteed not to roll-over
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// within 100 years, so perf_freq must be less than 2.9*10^9.
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return perf_count.QuadPart / perf_freq.QuadPart * 1000000 +
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perf_count.QuadPart % perf_freq.QuadPart * 1000000 / perf_freq.QuadPart;
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}
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void mp_raw_time_init(void)
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{
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QueryPerformanceFrequency(&perf_freq);
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#if !HAVE_UWP
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// allow (undocumented) control of all the High Res Timers parameters,
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// for easier experimentation and diagnostic of bug reports.
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const char *v;
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// 1..1000 ms max timetout for hires (used in "perwait" mode)
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if ((v = getenv("MPV_HRT_MAX"))) {
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int hmax = atoi(v);
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if (hmax >= 1 && hmax <= 1000)
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hires_max = hmax;
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}
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// 1..15 ms hires resolution (not used in "never" mode)
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if ((v = getenv("MPV_HRT_RES"))) {
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int res = atoi(v);
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if (res >= 1 && res <= 15)
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hires_res = res;
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}
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// "always"/"never"/"perwait" (or "auto" - same as unset)
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if (!(v = getenv("MPV_HRT")) || !strcmp(v, "auto"))
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v = IsWindows10OrGreater() ? "perwait" : "always";
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if (!strcmp(v, "perwait")) {
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// no-op, already per-wait
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} else if (!strcmp(v, "never")) {
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hires_max = 0;
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} else { // "always" or unknown value
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hires_max = 0;
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timeBeginPeriod(hires_res);
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}
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#endif
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}
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