osdep/timer-win2: rename to timer-win32

1 files changed, 141 insertions, 0 deletions

diff --git a/osdep/timer-win32.c b/osdep/timer-win32.c
new file mode 100644
index 0000000000..7867b5a525
--- /dev/null
+++ b/osdep/timer-win32.c
@@ -0,0 +1,141 @@
+/*
+ * 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
+}