qtmobility/plugins/multimedia/gstreamer/mediacapture/maemo/qgstreamervideoencode_maemo.cpp
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#include "qgstreamervideoencode_maemo.h"
#include "qgstreamercapturesession_maemo.h"
#include "qgstreamermediacontainercontrol_maemo.h"
#include <QtCore/qdebug.h>
QGstreamerVideoEncode::QGstreamerVideoEncode(QGstreamerCaptureSession *session)
:QVideoEncoderControl(session), m_session(session)
{
QList<QByteArray> codecCandidates;
codecCandidates << "video/mpeg4"; //"video/h264" << "video/xvid" << "video/mpeg4" << "video/mpeg1" << "video/mpeg2" << "video/theora";
m_elementNames["video/mpeg4"] = "dspmp4venc";
m_codecOptions["video/mpeg4"] = QStringList() << "quantizer";
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));
m_streamTypes.insert(codecName,
QGstreamerMediaContainerControl::supportedStreamTypes(factory, GST_PAD_SRC));
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()
{
QString codec = m_videoSettings.codec();
GstElement *encoderElement = gst_element_factory_make( m_elementNames.value(codec).constData(), "video-encoder");
return encoderElement;
}
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>();
}
QSet<QString> QGstreamerVideoEncode::supportedStreamTypes(const QString &codecName) const
{
return m_streamTypes.value(codecName);
}