mirror of
https://github.com/wang-bin/QtAV.git
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wang-bin
108 lines
3.3 KiB
C++
108 lines
3.3 KiB
C++
/******************************************************************************
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VideoRendererTypes: type id and manually id register function
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Copyright (C) 2015 Wang Bin <wbsecg1@gmail.com>
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* This file is part of QtAV
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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 "QtAVWidgets/VideoPreviewWidget.h"
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#include "QtAV/VideoFrameExtractor.h"
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#include "QtAV/VideoOutput.h"
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#include <QtGui/QResizeEvent>
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namespace QtAV {
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VideoPreviewWidget::VideoPreviewWidget(QWidget *parent)
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: QWidget(parent)
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, m_keep_ar(false)
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, m_extractor(new VideoFrameExtractor(this))
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, m_out(new VideoOutput(VideoRendererId_Widget, this))
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// FIXME: opengl may crash, so use software renderer here
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{
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setWindowFlags(Qt::FramelessWindowHint);
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Q_ASSERT_X(m_out->widget(), "VideoPreviewWidget()", "widget based renderer is not found");
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m_out->widget()->setParent(this);
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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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m_extractor->setAutoExtract(false);
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}
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void VideoPreviewWidget::resizeEvent(QResizeEvent *e)
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{
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m_out->widget()->resize(e->size());
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}
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void VideoPreviewWidget::setTimestamp(qint64 value)
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{
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m_extractor->setPosition(value);
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}
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qint64 VideoPreviewWidget::timestamp() const
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{
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return m_extractor->position();
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}
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void VideoPreviewWidget::preview()
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{
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m_extractor->extract();
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}
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void VideoPreviewWidget::setFile(const QString &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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m_extractor->setSource(m_file);
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emit fileChanged();
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}
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QString VideoPreviewWidget::file() const
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{
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return m_file;
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}
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void VideoPreviewWidget::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 (m_out->isSupported(frame.format().pixelFormat())) {
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m_out->receive(frame);
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return;
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}
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QSize s = m_out->widget()->rect().size();
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if (m_keep_ar) {
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QSize fs(frame.size());
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fs.scale(s, Qt::KeepAspectRatio);
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s = fs;
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}
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VideoFrame f(frame.to(VideoFormat::Format_RGB32, s));
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if (!f.isValid())
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return;
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m_out->receive(f);
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}
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void VideoPreviewWidget::displayNoFrame()
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{
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m_out->receive(VideoFrame());
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}
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} //namespace QtAV
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