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/*
* Copyright (C) 2013 Canonical, Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "thumbnail-provider.h"
#include "thumbnail-pipeline-gst.h"
#include <QtCore/QStringList>
#include <QtCore/QTimer>
#include <QtCore/QMutex>
#include <QtCore/QMutexLocker>
#include <QtCore/QCoreApplication>
#include <QtMultimedia/QVideoRendererControl>
#include <QtMultimedia/QMediaService>
ThumbnailProvider::ThumbnailProvider()
: QObject(0),
QQuickImageProvider(QQuickImageProvider::Image),
m_player(0)
{
connect(qApp, SIGNAL(aboutToQuit()), this, SLOT(applicationAboutToQuit()), Qt::DirectConnection);
createPlayer();
}
ThumbnailProvider::~ThumbnailProvider()
{
if (m_player) {
QMutexLocker locker(&m_mutex);
delete m_player;
m_player = 0;
}
}
void ThumbnailProvider::createPlayer()
{
m_player = new ThumbnailPipeline();
}
void ThumbnailProvider::applicationAboutToQuit()
{
QMutexLocker locker(&m_mutex);
delete m_player;
m_player = 0;
}
QString ThumbnailProvider::parseThumbnailName(const QString &id, qint64 *time) const
{
QStringList data = id.split("/");
if (data.count() < 2) {
return "";
}
bool ok;
*time = data.takeLast().toInt(&ok, 10);
if (ok) {
return data.join("/");
} else {
*time = 0;
return "";
}
}
QImage ThumbnailProvider::requestImage (const QString &id, QSize *size, const QSize &requestedSize)
{
qint64 time;
QString uri = parseThumbnailName(id, &time);
if (uri.isEmpty()) {
qWarning() << "Invalid url:" << id;
return QImage();
}
// check if the player exists ( the application still running )
if (!m_player) {
return QImage();
}
QMutexLocker locker(&m_mutex);
// again check if the player exits after lock the mutex, since this function will run in a separed thread,
// the application could be destroyed at this point and the function applicationAboutToQuit was called
if (!m_player) {
return QImage();
}
if (uri != m_player->uri()) {
m_player->setUri(uri);
m_cache.clear();
}
QImage img;
if (m_cache.contains(time)) {
img = m_cache[time];
} else {
img = m_player->request(time, requestedSize).copy();
if (!img.isNull()) {
m_cache.insert(time, img);
}
}
*size = img.size();
return img;
}
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