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>

1 files changed, 111 insertions, 0 deletions

diff --git a/src/plugins/directshow/helpers/directshowmediatypeenum.cpp b/src/plugins/directshow/helpers/directshowmediatypeenum.cpp
new file mode 100644
index 000000000..a1c8b2306
--- /dev/null
+++ b/src/plugins/directshow/helpers/directshowmediatypeenum.cpp
@@ -0,0 +1,111 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "directshowmediatypeenum.h"
+
+#include "directshowpin.h"
+
+DirectShowMediaTypeEnum::DirectShowMediaTypeEnum(DirectShowPin *pin)
+    : m_pin(pin)
+    , m_mediaTypes(pin->supportedMediaTypes())
+    , m_index(0)
+{
+    m_pin->AddRef();
+}
+
+DirectShowMediaTypeEnum::DirectShowMediaTypeEnum(const QList<DirectShowMediaType> &types)
+    : m_pin(NULL)
+    , m_mediaTypes(types)
+    , m_index(0)
+{
+}
+
+DirectShowMediaTypeEnum::~DirectShowMediaTypeEnum()
+{
+    if (m_pin)
+        m_pin->Release();
+}
+
+HRESULT DirectShowMediaTypeEnum::getInterface(REFIID riid, void **ppvObject)
+{
+    if (riid == IID_IEnumMediaTypes) {
+        return GetInterface(static_cast<IEnumMediaTypes *>(this), ppvObject);
+    } else {
+        return DirectShowObject::getInterface(riid, ppvObject);
+    }
+}
+
+HRESULT DirectShowMediaTypeEnum::Next(ULONG cMediaTypes, AM_MEDIA_TYPE **ppMediaTypes, ULONG *pcFetched)
+{
+    if (ppMediaTypes && (pcFetched || cMediaTypes == 1)) {
+        ULONG count = qBound<ULONG>(0, cMediaTypes, m_mediaTypes.count() - m_index);
+
+        for (ULONG i = 0; i < count; ++i, ++m_index) {
+            ppMediaTypes[i] = reinterpret_cast<AM_MEDIA_TYPE *>(CoTaskMemAlloc(sizeof(AM_MEDIA_TYPE)));
+            DirectShowMediaType::copy(ppMediaTypes[i], m_mediaTypes.at(m_index));
+        }
+
+        if (pcFetched)
+            *pcFetched = count;
+
+        return count == cMediaTypes ? S_OK : S_FALSE;
+    } else {
+        return E_POINTER;
+    }
+}
+
+HRESULT DirectShowMediaTypeEnum::Skip(ULONG cMediaTypes)
+{
+    m_index = qMin(int(m_index + cMediaTypes), m_mediaTypes.count());
+    return m_index < m_mediaTypes.count() ? S_OK : S_FALSE;
+}
+
+HRESULT DirectShowMediaTypeEnum::Reset()
+{
+    m_index = 0;
+    return S_OK;
+}
+
+HRESULT DirectShowMediaTypeEnum::Clone(IEnumMediaTypes **ppEnum)
+{
+    if (ppEnum) {
+        if (m_pin)
+            *ppEnum = new DirectShowMediaTypeEnum(m_pin);
+        else
+            *ppEnum = new DirectShowMediaTypeEnum(m_mediaTypes);
+        return S_OK;
+    } else {
+        return E_POINTER;
+    }
+}
+