diff -r cfcbf08528c4 -r 2b40d63a9c3d qtmobility/plugins/multimedia/gstreamer/mediacapture/qgstreamervideoencode.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/qtmobility/plugins/multimedia/gstreamer/mediacapture/qgstreamervideoencode.cpp	Fri Apr 16 15:51:22 2010 +0300
@@ -0,0 +1,321 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Qt Mobility Components.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qgstreamervideoencode.h"
+#include "qgstreamercapturesession.h"
+
+#include <QtCore/qdebug.h>
+
+#include <math.h>
+
+QGstreamerVideoEncode::QGstreamerVideoEncode(QGstreamerCaptureSession *session)
+    :QVideoEncoderControl(session), m_session(session)
+{
+    QList<QByteArray> codecCandidates;
+    codecCandidates << "video/h264" << "video/xvid" << "video/mpeg4" << "video/mpeg1" << "video/mpeg2" << "video/theora";
+
+    m_elementNames["video/h264"] = "x264enc";
+    m_elementNames["video/xvid"] = "xvidenc";
+    m_elementNames["video/mpeg4"] = "ffenc_mpeg4";
+    m_elementNames["video/mpeg1"] = "ffenc_mpeg1video";
+    m_elementNames["video/mpeg2"] = "ffenc_mpeg2video";
+    m_elementNames["video/theora"] = "theoraenc";
+
+    m_codecOptions["video/h264"] = QStringList() << "quantizer";
+    m_codecOptions["video/xvid"] = QStringList() << "quantizer" << "profile";
+    m_codecOptions["video/mpeg4"] = QStringList() << "quantizer";
+    m_codecOptions["video/mpeg1"] = QStringList() << "quantizer";
+    m_codecOptions["video/mpeg2"] = QStringList() << "quantizer";
+    m_codecOptions["video/theora"] = QStringList();
+
+    foreach( const QByteArray& codecName, codecCandidates ) {
+        QByteArray elementName = m_elementNames[codecName];
+        GstElementFactory *factory = gst_element_factory_find(elementName.constData());
+        if (factory) {
+            m_codecs.append(codecName);
+            const gchar *descr = gst_element_factory_get_description(factory);
+            m_codecDescriptions.insert(codecName, QString::fromUtf8(descr));
+
+            gst_object_unref(GST_OBJECT(factory));
+        }
+    }
+
+    if (!m_codecs.isEmpty())
+        m_videoSettings.setCodec(m_codecs[0]);
+}
+
+QGstreamerVideoEncode::~QGstreamerVideoEncode()
+{
+}
+
+QList<QSize> QGstreamerVideoEncode::supportedResolutions(const QVideoEncoderSettings &, bool *continuous) const
+{
+    if (continuous)
+        *continuous = m_session->videoInput() != 0;
+
+    return m_session->videoInput() ? m_session->videoInput()->supportedResolutions() : QList<QSize>();
+}
+
+QList< qreal > QGstreamerVideoEncode::supportedFrameRates(const QVideoEncoderSettings &, bool *continuous) const
+{
+    if (continuous)
+        *continuous = false;
+
+    return m_session->videoInput() ? m_session->videoInput()->supportedFrameRates() : QList<qreal>();
+}
+
+QStringList QGstreamerVideoEncode::supportedVideoCodecs() const
+{
+    return m_codecs;
+}
+
+QString QGstreamerVideoEncode::videoCodecDescription(const QString &codecName) const
+{
+    return m_codecDescriptions.value(codecName);
+}
+
+QStringList QGstreamerVideoEncode::supportedEncodingOptions(const QString &codec) const
+{
+    return m_codecOptions.value(codec);
+}
+
+QVariant QGstreamerVideoEncode::encodingOption(const QString &codec, const QString &name) const
+{
+    return m_options[codec].value(name);
+}
+
+void QGstreamerVideoEncode::setEncodingOption(
+        const QString &codec, const QString &name, const QVariant &value)
+{
+    m_options[codec][name] = value;
+}
+
+QVideoEncoderSettings QGstreamerVideoEncode::videoSettings() const
+{
+    return m_videoSettings;
+}
+
+void QGstreamerVideoEncode::setVideoSettings(const QVideoEncoderSettings &settings)
+{
+    m_videoSettings = settings;
+}
+
+GstElement *QGstreamerVideoEncode::createEncoder()
+{
+    GstBin *encoderBin = GST_BIN(gst_bin_new("video-encoder-bin"));
+    Q_ASSERT(encoderBin);
+
+    GstElement *capsFilter = gst_element_factory_make("capsfilter", "capsfilter-video");
+    gst_bin_add(encoderBin, capsFilter);
+
+    GstElement *colorspace = gst_element_factory_make("ffmpegcolorspace", NULL);
+    gst_bin_add(encoderBin, colorspace);
+
+    QString codec = m_videoSettings.codec();
+    //qDebug() << "create encoder for video codec" << codec;
+
+    GstElement *encoderElement = gst_element_factory_make( m_elementNames.value(codec).constData(), "video-encoder");
+    gst_bin_add(encoderBin, encoderElement);
+
+    gst_element_link_many(capsFilter, colorspace, encoderElement, NULL);
+
+    // add ghostpads
+    GstPad *pad = gst_element_get_static_pad(capsFilter, "sink");
+    gst_element_add_pad(GST_ELEMENT(encoderBin), gst_ghost_pad_new("sink", pad));
+    gst_object_unref(GST_OBJECT(pad));
+
+    pad = gst_element_get_static_pad(encoderElement, "src");
+    gst_element_add_pad(GST_ELEMENT(encoderBin), gst_ghost_pad_new("src", pad));
+    gst_object_unref(GST_OBJECT(pad));
+
+    if (encoderElement) {
+        if (m_videoSettings.encodingMode() == QtMedia::ConstantQualityEncoding) {
+            QtMedia::EncodingQuality qualityValue = m_videoSettings.quality();
+
+            if (codec == QLatin1String("video/h264")) {
+                //constant quantizer mode
+                g_object_set(G_OBJECT(encoderElement), "pass", 4, NULL);
+                int qualityTable[] = {
+                    50, //VeryLow
+                    35, //Low
+                    21, //Normal
+                    15, //High
+                    8 //VeryHigh
+                };
+                g_object_set(G_OBJECT(encoderElement), "quantizer", qualityTable[qualityValue], NULL);
+            } else if (codec == QLatin1String("video/xvid")) {
+                //constant quantizer mode
+                g_object_set(G_OBJECT(encoderElement), "pass", 3, NULL);
+                int qualityTable[] = {
+                    32, //VeryLow
+                    12, //Low
+                    5, //Normal
+                    3, //High
+                    2 //VeryHigh
+                };
+                int quant = qualityTable[qualityValue];
+                g_object_set(G_OBJECT(encoderElement), "quantizer", quant, NULL);
+            } else if (codec == QLatin1String("video/mpeg4") ||
+                       codec == QLatin1String("video/mpeg1") ||
+                       codec == QLatin1String("video/mpeg2") ) {
+                //constant quantizer mode
+                g_object_set(G_OBJECT(encoderElement), "pass", 2, NULL);
+                //quant from 1 to 30, default ~3
+                double qualityTable[] = {
+                    20, //VeryLow
+                    8.0, //Low
+                    3.0, //Normal
+                    2.5, //High
+                    2.0 //VeryHigh
+                };
+                double quant = qualityTable[qualityValue];
+                g_object_set(G_OBJECT(encoderElement), "quantizer", quant, NULL);
+            } else if (codec == QLatin1String("video/theora")) {
+                int qualityTable[] = {
+                    8, //VeryLow
+                    16, //Low
+                    32, //Normal
+                    45, //High
+                    60 //VeryHigh
+                };
+                //quality from 0 to 63
+                int quality = qualityTable[qualityValue];
+                g_object_set(G_OBJECT(encoderElement), "quality", quality, NULL);
+            }
+        } else {
+            int bitrate = m_videoSettings.bitRate();
+            if (bitrate > 0) {
+                g_object_set(G_OBJECT(encoderElement), "bitrate", bitrate, NULL);
+            }
+        }
+
+        QMap<QString,QVariant> options = m_options.value(codec);
+        QMapIterator<QString,QVariant> it(options);
+        while (it.hasNext()) {
+            it.next();
+            QString option = it.key();
+            QVariant value = it.value();
+
+            switch (value.type()) {
+            case QVariant::Int:
+                g_object_set(G_OBJECT(encoderElement), option.toAscii(), value.toInt(), NULL);
+                break;
+            case QVariant::Bool:
+                g_object_set(G_OBJECT(encoderElement), option.toAscii(), value.toBool(), NULL);
+                break;
+            case QVariant::Double:
+                g_object_set(G_OBJECT(encoderElement), option.toAscii(), value.toDouble(), NULL);
+                break;
+            case QVariant::String:
+                g_object_set(G_OBJECT(encoderElement), option.toAscii(), value.toString().toUtf8().constData(), NULL);
+                break;
+            default:
+                qWarning() << "unsupported option type:" << option << value;
+                break;
+            }
+
+        }
+    }
+
+    if (!m_videoSettings.resolution().isEmpty() || m_videoSettings.frameRate() > 0.001) {
+        GstCaps *caps = gst_caps_new_empty();
+        QStringList structureTypes;
+        structureTypes << "video/x-raw-yuv" << "video/x-raw-rgb";
+
+        foreach(const QString &structureType, structureTypes) {
+            GstStructure *structure = gst_structure_new(structureType.toAscii().constData(), NULL);
+
+            if (!m_videoSettings.resolution().isEmpty()) {
+                gst_structure_set(structure, "width", G_TYPE_INT, m_videoSettings.resolution().width(), NULL);
+                gst_structure_set(structure, "height", G_TYPE_INT, m_videoSettings.resolution().height(), NULL);
+            }
+
+            if (m_videoSettings.frameRate() > 0.001) {
+                QPair<int,int> rate = rateAsRational();
+
+                //qDebug() << "frame rate:" << num << denum;
+
+                gst_structure_set(structure, "framerate", GST_TYPE_FRACTION, rate.first, rate.second, NULL);
+            }
+
+            gst_caps_append_structure(caps,structure);
+        }
+
+        //qDebug() << "set video caps filter:" << gst_caps_to_string(caps);
+
+        g_object_set(G_OBJECT(capsFilter), "caps", caps, NULL);
+    }
+
+    return GST_ELEMENT(encoderBin);
+}
+
+QPair<int,int> QGstreamerVideoEncode::rateAsRational() const
+{
+    qreal frameRate = m_videoSettings.frameRate();
+
+    if (frameRate > 0.001) {
+        //convert to rational number
+        QList<int> denumCandidates;
+        denumCandidates << 1 << 2 << 3 << 5 << 10 << 1001 << 1000;
+
+        qreal error = 1.0;
+        int num = 1;
+        int denum = 1;
+
+        foreach (int curDenum, denumCandidates) {
+            int curNum = qRound(frameRate*curDenum);
+            qreal curError = qAbs(qreal(curNum)/curDenum - frameRate);
+
+            if (curError < error) {
+                error = curError;
+                num = curNum;
+                denum = curDenum;
+            }
+
+            if (curError < 1e-8)
+                break;
+        }
+
+        return QPair<int,int>(num,denum);
+    }
+
+    return QPair<int,int>();
+}