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#include "qgstreamervideoencode.h"
#include "qgstreamercapturesession.h"
#include "qgstreamermediacontainercontrol.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));
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()
{
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() == QtMediaServices::ConstantQualityEncoding) {
QtMediaServices::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>();
}
QSet<QString> QGstreamerVideoEncode::supportedStreamTypes(const QString &codecName) const
{
return m_streamTypes.value(codecName);
}