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https://github.com/wang-bin/QtAV.git
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wang-bin
81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
/******************************************************************************
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QtAV: Multimedia framework based on Qt and FFmpeg
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Copyright (C) 2012-2016 Wang Bin <wbsecg1@gmail.com>
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* This file is part of QtAV (from 2014)
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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******************************************************************************/
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#include "QmlAV/QuickVideoPreview.h"
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#include <QtCore/QRectF>
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namespace QtAV {
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QuickVideoPreview::QuickVideoPreview(QQuickItem *parent) : BaseQuickRenderer(parent)
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{
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connect(&m_extractor, SIGNAL(positionChanged()), this, SIGNAL(timestampChanged()));
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connect(&m_extractor, SIGNAL(frameExtracted(QtAV::VideoFrame)), SLOT(displayFrame(QtAV::VideoFrame)));
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connect(&m_extractor, SIGNAL(error()), SLOT(displayNoFrame()));
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connect(this, SIGNAL(fileChanged()), SLOT(displayNoFrame()));
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}
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void QuickVideoPreview::setTimestamp(int value)
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{
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m_extractor.setPosition((qint64)value);
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}
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int QuickVideoPreview::timestamp() const
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{
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return (int)m_extractor.position();
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}
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void QuickVideoPreview::setFile(const QUrl &value)
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{
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if (m_file == value)
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return;
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m_file = value;
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emit fileChanged();
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m_extractor.setSource(QUrl::fromPercentEncoding(m_file.toEncoded()));
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}
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QUrl QuickVideoPreview::file() const
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{
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return m_file;
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}
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void QuickVideoPreview::displayFrame(const QtAV::VideoFrame &frame)
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{
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int diff = qAbs(qint64(frame.timestamp()*1000.0) - m_extractor.position());
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if (diff > m_extractor.precision()) {
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//qWarning("timestamp difference (%d/%lld) is too large! ignore", diff);
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}
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if (isOpenGL() || frame.imageFormat() != QImage::Format_Invalid) {
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receive(frame);
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return;
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}
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VideoFrame f(frame.to(VideoFormat::Format_RGB32, boundingRect().toRect().size()));
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if (!f.isValid())
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return;
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receive(f);
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}
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void QuickVideoPreview::displayNoFrame()
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{
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receive(VideoFrame());
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}
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} //namespace QtAV
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