From ade8f281cb1e4f4e03fc3bfdf8a0b7b9ccd819c9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20Str=C3=B8mme?= <christian.stromme@qt.io>
Date: Wed, 9 Nov 2016 15:29:39 +0100
Subject: DirectShow: Add utility class

Centralized place for helper functions etc.

Change-Id: Ia4474d0681a37fc95a100a3766800141a8b1d900
Reviewed-by: Yoann Lopes <yoann.lopes@qt.io>
---
 src/plugins/directshow/helpers/directshowutils.h | 87 ++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 src/plugins/directshow/helpers/directshowutils.h

(limited to 'src/plugins/directshow/helpers/directshowutils.h')

diff --git a/src/plugins/directshow/helpers/directshowutils.h b/src/plugins/directshow/helpers/directshowutils.h
new file mode 100644
index 000000000..09c81c257
--- /dev/null
+++ b/src/plugins/directshow/helpers/directshowutils.h
@@ -0,0 +1,87 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef DIRECTSHOWUTILS_H
+#define DIRECTSHOWUTILS_H
+
+#include "directshowglobal.h"
+
+QT_BEGIN_NAMESPACE
+
+namespace DirectShowUtils
+{
+template <typename T>
+void safeRelease(T **iface) {
+    if (!iface)
+        return;
+
+    if (!*iface)
+        return;
+
+    (*iface)->Release();
+    *iface = nullptr;
+}
+
+template <typename T>
+struct ScopedSafeRelease
+{
+    T **iunknown;
+    ~ScopedSafeRelease()
+    {
+        DirectShowUtils::safeRelease(iunknown);
+    }
+};
+
+bool getPin(IBaseFilter *filter, PIN_DIRECTION pinDirection, IPin **pin, HRESULT *hrOut);
+bool isPinConnected(IPin *pin, HRESULT *hrOut = nullptr);
+bool hasPinDirection(IPin *pin, PIN_DIRECTION direction, HRESULT *hrOut = nullptr);
+bool matchPin(IPin *pin, PIN_DIRECTION pinDirection, BOOL shouldBeConnected, HRESULT *hrOut = nullptr);
+bool findUnconnectedPin(IBaseFilter *filter, PIN_DIRECTION pinDirection, IPin **pin, HRESULT *hrOut = nullptr);
+bool connectFilters(IGraphBuilder *graph, IPin *outputPin, IBaseFilter *filter, HRESULT *hrOut = nullptr);
+bool connectFilters(IGraphBuilder *graph, IBaseFilter *filter, IPin *inputPin, HRESULT *hrOut = nullptr);
+bool connectFilters(IGraphBuilder *graph,
+                    IBaseFilter *upstreamFilter,
+                    IBaseFilter *downstreamFilter,
+                    bool autoConnect = false,
+                    HRESULT *hrOut = nullptr);
+}
+
+QT_END_NAMESPACE
+
+#endif // DIRECTSHOWUTILS_H
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