mirror of
https://github.com/mpv-player/mpv
synced 2025-03-30 15:29:56 +00:00
59dd7d94af
Linux and macOS already use nanosecond resolution for their sleep functions. It was just being converted from microseconds before. Since we have mp_time_ns now, go ahead and bump the precision here. The timer for windows uses some timeBeginPeriod thing which I'm not sure what it does really but whatever just convert the units to ms like they were doing before. There's really no reason to keep the mp_sleep_us helper around. A multiplication by 1000 is trivial and underlying OS clocks have nanosecond precision.
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_ns(int64_t ns)
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{
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if (ns < 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 (ns < 1e6)
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ns = 1e6;
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int hrt = mp_start_hires_timers(ns / 1e6);
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Sleep(ns / 1e6);
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mp_end_hires_timers(hrt);
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}
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uint64_t mp_raw_time_ns(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 nanoseconds. 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 * UINT64_C(1000000000) +
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perf_count.QuadPart % perf_freq.QuadPart * UINT64_C(1000000000) / 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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