From 631b89ddde44dfc8b72b904d8c41368b2c02d037 Mon Sep 17 00:00:00 2001
From: Yoann Lopes <yoann.lopes@theqtcompany.com>
Date: Fri, 29 Jan 2016 15:18:33 +0100
Subject: DirectShow: refactor custom renderer filter

Refactor out some of the filter and pin logic into the
DirectShowBaseFilter and DirectShowPin abstract classes.
This will avoid code duplication when implementing the probe
filter. The existing source filter (for qrc files) can also be
refactored to use these abstract classes.

Change-Id: Iaf141472dea82579ad085b3318624f9a57aa46d8
Reviewed-by: Christian Stromme <christian.stromme@qt.io>
---
 .../directshow/helpers/directshowpinenum.cpp       | 126 +++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 src/plugins/directshow/helpers/directshowpinenum.cpp

(limited to 'src/plugins/directshow/helpers/directshowpinenum.cpp')

diff --git a/src/plugins/directshow/helpers/directshowpinenum.cpp b/src/plugins/directshow/helpers/directshowpinenum.cpp
new file mode 100644
index 000000000..61aca8b9c
--- /dev/null
+++ b/src/plugins/directshow/helpers/directshowpinenum.cpp
@@ -0,0 +1,126 @@
+/****************************************************************************
+**
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "directshowpinenum.h"
+#include "directshowbasefilter.h"
+
+DirectShowPinEnum::DirectShowPinEnum(DirectShowBaseFilter *filter)
+    : m_filter(filter)
+    , m_index(0)
+{
+    m_filter->AddRef();
+    const QList<DirectShowPin *> pinList = filter->pins();
+    for (DirectShowPin *pin : pinList) {
+        pin->AddRef();
+        m_pins.append(pin);
+    }
+}
+
+DirectShowPinEnum::DirectShowPinEnum(const QList<IPin *> &pins)
+    : m_filter(NULL)
+    , m_pins(pins)
+    , m_index(0)
+{
+    for (IPin *pin : qAsConst(m_pins))
+        pin->AddRef();
+}
+
+DirectShowPinEnum::~DirectShowPinEnum()
+{
+    for (IPin *pin : qAsConst(m_pins))
+        pin->Release();
+    if (m_filter)
+        m_filter->Release();
+}
+
+HRESULT DirectShowPinEnum::getInterface(REFIID riid, void **ppvObject)
+{
+    if (riid == IID_IEnumPins) {
+        return GetInterface(static_cast<IEnumPins *>(this), ppvObject);
+    } else {
+        return DirectShowObject::getInterface(riid, ppvObject);
+    }
+}
+
+HRESULT DirectShowPinEnum::Next(ULONG cPins, IPin **ppPins, ULONG *pcFetched)
+{
+    if (ppPins && (pcFetched || cPins == 1)) {
+        ULONG count = qBound<ULONG>(0, cPins, m_pins.count() - m_index);
+
+        for (ULONG i = 0; i < count; ++i, ++m_index) {
+            ppPins[i] = m_pins.at(m_index);
+            ppPins[i]->AddRef();
+        }
+
+        if (pcFetched)
+            *pcFetched = count;
+
+        return count == cPins ? S_OK : S_FALSE;
+    } else {
+        return E_POINTER;
+    }
+}
+
+HRESULT DirectShowPinEnum::Skip(ULONG cPins)
+{
+    m_index = qMin(int(m_index + cPins), m_pins.count());
+
+    return m_index < m_pins.count() ? S_OK : S_FALSE;
+}
+
+HRESULT DirectShowPinEnum::Reset()
+{
+    m_index = 0;
+
+    return S_OK;
+}
+
+HRESULT DirectShowPinEnum::Clone(IEnumPins **ppEnum)
+{
+    if (ppEnum) {
+        if (m_filter)
+            *ppEnum = new DirectShowPinEnum(m_filter);
+        else
+            *ppEnum = new DirectShowPinEnum(m_pins);
+
+        return S_OK;
+    } else {
+        return E_POINTER;
+    }
+}
-- 
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