--- /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>();
+}