gstreamer/subprojects/gst-plugins-bad/sys/win32ipc/gstwin32ipcutils.cpp

Ignoring revisions in .git-blame-ignore-revs. Click here to bypass and see the normal blame view.

72 lines
1.9 KiB
C++
Raw Normal View History

/* GStreamer
* Copyright (C) 2022 Seungha Yang <seungha@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "gstwin32ipcutils.h"
#include <windows.h>
#include <string>
#include <mutex>
static ULONG global_index = 0;
static DWORD
gst_win32_ipc_get_pid (void)
{
static std::once_flag once_flag;
static DWORD pid = 0;
std::call_once (once_flag,[&]() {
pid = GetCurrentProcessId ();
});
return pid;
}
/* Create unique prefix for named shared memory */
gchar *
gst_win32_ipc_get_mmf_prefix (void)
{
std::string prefix = "Local\\gst.win32.ipc." +
std::to_string (gst_win32_ipc_get_pid ()) + std::string (".") +
std::to_string (InterlockedIncrement (&global_index)) + std::string (".");
return g_strdup (prefix.c_str ());
}
gboolean
gst_win32_ipc_clock_is_qpc (GstClock * clock)
{
GstClockType clock_type = GST_CLOCK_TYPE_MONOTONIC;
GstClock *mclock;
if (G_OBJECT_TYPE (clock) != GST_TYPE_SYSTEM_CLOCK)
return FALSE;
g_object_get (clock, "clock-type", &clock_type, nullptr);
if (clock_type != GST_CLOCK_TYPE_MONOTONIC)
return FALSE;
mclock = gst_clock_get_master (clock);
if (!mclock)
return TRUE;
gst_object_unref (mclock);
return FALSE;
}