SuqashSRS4: Build SRT native

trunk/3rdparty/srt-1-fit/common/win_time.cpp

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+/*
+ * SRT - Secure, Reliable, Transport
+ * Copyright (c) 2018 Haivision Systems Inc.
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ * 
+ */
+
+/*****************************************************************************
+written by
+   Haivision Systems Inc.
+ *****************************************************************************/
+
+#include "win/wintime.h"
+#include <sys/timeb.h>
+
+void SRTCompat_timeradd(struct timeval *a, struct timeval *b, struct timeval *result)
+{
+    result->tv_sec  = a->tv_sec + b->tv_sec;
+    result->tv_usec = a->tv_usec + b->tv_usec;
+    if (result->tv_usec >= 1000000)
+    {
+        result->tv_sec++;
+        result->tv_usec -= 1000000;
+    }
+}
+
+int SRTCompat_gettimeofday(struct timeval* tp, struct timezone* tz)
+{
+    static LARGE_INTEGER tickFrequency, epochOffset;
+
+    // For our first call, use "ftime()", so that we get a time with a proper epoch.
+    // For subsequent calls, use "QueryPerformanceCount()", because it's more fine-grain.
+    static int isFirstCall = 1;
+
+    LARGE_INTEGER tickNow;
+    QueryPerformanceCounter(&tickNow);
+
+    if (isFirstCall)
+    {
+        struct timeb tb;
+        ftime(&tb);
+        tp->tv_sec  = (long)tb.time;
+        tp->tv_usec = 1000*tb.millitm;
+
+        // Also get our counter frequency:
+        QueryPerformanceFrequency(&tickFrequency);
+
+        // And compute an offset to add to subsequent counter times, so we get a proper epoch:
+        epochOffset.QuadPart = tb.time*tickFrequency.QuadPart + (tb.millitm*tickFrequency.QuadPart)/1000 - tickNow.QuadPart;
+
+        isFirstCall = 0; // for next time
+    }
+    else
+    {
+        // Adjust our counter time so that we get a proper epoch:
+        tickNow.QuadPart += epochOffset.QuadPart;
+
+        tp->tv_sec = (long) (tickNow.QuadPart / tickFrequency.QuadPart);
+        tp->tv_usec = (long) (((tickNow.QuadPart % tickFrequency.QuadPart) * 1000000L) / tickFrequency.QuadPart);
+    }
+    return 0;
+}