DirectShow: Sample grabber

Sample grabber filter to be used in the camera implementation, and a
prerequisite for adding audio and video probes support in DirectShow.

Change-Id: I94f6332ebf75788847bfe629e92132f8a03b40e7
Reviewed-by: Yoann Lopes <yoann.lopes@qt.io>

1 files changed, 89 insertions, 0 deletions

diff --git a/src/plugins/directshow/common/directshowsamplegrabber.h b/src/plugins/directshow/common/directshowsamplegrabber.h
new file mode 100644
index 000000000..edabae2db
--- /dev/null
+++ b/src/plugins/directshow/common/directshowsamplegrabber.h
@@ -0,0 +1,89 @@
+/****************************************************************************
+**
+** 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 DIRECTSHOWSAMPLEGRABBER_H
+#define DIRECTSHOWSAMPLEGRABBER_H
+
+#include <QtCore/qglobal.h>
+#include <QtCore/qobject.h>
+
+// TODO: Fix this.
+#include <directshowcameraglobal.h>
+
+QT_BEGIN_NAMESPACE
+
+class SampleGrabberCallbackPrivate;
+
+class DirectShowSampleGrabber : public QObject
+{
+    Q_OBJECT
+public:
+    DirectShowSampleGrabber(QObject *p = nullptr);
+    ~DirectShowSampleGrabber();
+
+    // 0 = ISampleGrabberCB::SampleCB, 1 = ISampleGrabberCB::BufferCB
+    enum class CallbackMethod : long
+    {
+        SampleCB,
+        BufferCB
+    };
+
+    bool isValid() const { return m_filter && m_sampleGrabber; }
+    bool getConnectedMediaType(AM_MEDIA_TYPE *mediaType);
+    bool setMediaType(const AM_MEDIA_TYPE *mediaType);
+
+    void stop();
+    void start(CallbackMethod method, bool oneShot = false, bool bufferSamples = false);
+
+    IBaseFilter *filter() const { return m_filter; }
+
+Q_SIGNALS:
+    void sampleAvailable(double time, IMediaSample *sample);
+    void bufferAvailable(double time, quint8 *buffer, long len);
+
+private:
+    IBaseFilter *m_filter;
+    ISampleGrabber *m_sampleGrabber;
+    SampleGrabberCallbackPrivate *m_sampleGabberCb;
+    CallbackMethod m_callbackType;
+};
+
+QT_END_NAMESPACE
+
+#endif // DIRECTSHOWSAMPLEGRABBER_H