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