Add private API for conversion from QVideoFrame to QImage.

The Android plugin had a function to convert from NV21 to RGB32.
It's now moved to the Qt Multimedia library and it supports additional
source formats. It could be further improved with more SIMD code, it
could then become a public API.

Change-Id: Ibee349027048a263a1a7ea74dc51237f7747912c
Reviewed-by: Christian Stromme <christian.stromme@theqtcompany.com>

1 files changed, 106 insertions, 0 deletions

diff --git a/src/multimedia/video/qvideoframeconversionhelper_p.h b/src/multimedia/video/qvideoframeconversionhelper_p.h
new file mode 100644
index 000000000..eead17a91
--- /dev/null
+++ b/src/multimedia/video/qvideoframeconversionhelper_p.h
@@ -0,0 +1,106 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QVIDEOFRAMECONVERSIONHELPER_P_H
+#define QVIDEOFRAMECONVERSIONHELPER_P_H
+
+#include <qvideoframe.h>
+#include <private/qsimd_p.h>
+
+typedef void (QT_FASTCALL *VideoFrameConvertFunc)(const QVideoFrame &frame, uchar *output);
+
+inline quint32 qConvertBGRA32ToARGB32(quint32 bgra)
+{
+    return (((bgra & 0xFF000000) >> 24)
+            | ((bgra & 0x00FF0000) >> 8)
+            | ((bgra & 0x0000FF00) << 8)
+            | ((bgra & 0x000000FF) << 24));
+}
+
+inline quint32 qConvertBGR24ToARGB32(const uchar *bgr)
+{
+    return 0xFF000000 | bgr[0] | bgr[1] << 8 | bgr[2] << 16;
+}
+
+inline quint32 qConvertBGR565ToARGB32(quint16 bgr)
+{
+    return 0xff000000
+            | ((((bgr) >> 8) & 0xf8) | (((bgr) >> 13) & 0x7))
+            | ((((bgr) << 5) & 0xfc00) | (((bgr) >> 1) & 0x300))
+            | ((((bgr) << 19) & 0xf80000) | (((bgr) << 14) & 0x70000));
+}
+
+inline quint32 qConvertBGR555ToARGB32(quint16 bgr)
+{
+    return 0xff000000
+            | ((((bgr) >> 7) & 0xf8) | (((bgr) >> 12) & 0x7))
+            | ((((bgr) << 6) & 0xf800) | (((bgr) << 1) & 0x700))
+            | ((((bgr) << 19) & 0xf80000) | (((bgr) << 11) & 0x70000));
+}
+
+#define FETCH_INFO_PACKED(frame) \
+    const uchar *src = frame.bits(); \
+    int stride = frame.bytesPerLine(); \
+    int width = frame.width(); \
+    int height = frame.height();
+
+#define FETCH_INFO_BIPLANAR(frame) \
+    const uchar *plane1 = frame.bits(0); \
+    const uchar *plane2 = frame.bits(1); \
+    int plane1Stride = frame.bytesPerLine(0); \
+    int plane2Stride = frame.bytesPerLine(1); \
+    int width = frame.width(); \
+    int height = frame.height();
+
+#define FETCH_INFO_TRIPLANAR(frame) \
+    const uchar *plane1 = frame.bits(0); \
+    const uchar *plane2 = frame.bits(1); \
+    const uchar *plane3 = frame.bits(2); \
+    int plane1Stride = frame.bytesPerLine(0); \
+    int plane2Stride = frame.bytesPerLine(1); \
+    int plane3Stride = frame.bytesPerLine(2); \
+    int width = frame.width(); \
+    int height = frame.height(); \
+
+#define MERGE_LOOPS(width, height, stride, bpp) \
+    if (stride == width * bpp) { \
+        width *= height; \
+        height = 1; \
+        stride = 0; \
+    }
+
+#define ALIGN(boundary, ptr, x, length) \
+    for (; ((reinterpret_cast<qintptr>(ptr) & (boundary - 1)) != 0) && x < length; ++x)
+
+#endif // QVIDEOFRAMECONVERSIONHELPER_P_H
+