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/*
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; either version
2 of the License, or (at your option) any later version.
*/
#include <QFile>
#include <QDataStream>
#include <QSettings>
#include <QDir>
#include <QSemaphore>
#include <QMutex>
#include <QProcess>
#include <QTemporaryFile>
#include <QPixmap>
#include "framecache.h"
FrameCache::FrameCache(QObject *parent) : QObject(parent){
mSemFree = new QSemaphore(128); // 128 queued requests for a frame, should be enough
mSemUsed = new QSemaphore;
mFrameCache = new QHash<QPair<QString, QString>, QString>();
mDataQueue = new QQueue<QPair<QString, QString> >();
mCacheMx = new QMutex;
mGenerator = new FrameCacheGenerator(this);
mGenerator->init(mSemFree, mSemUsed, mCacheMx, mDataQueue, mFrameCache);
mGenerator->readConfig();
rebuild();
mGenerator->start();
QSettings s;
mWhen = s.value("ui/grabframe", "00:00:00").toString();
}
FrameCache::~FrameCache(){
mGenerator->exit();
}
const QPixmap FrameCache::entry(const QString &sourcePath, const QString &when){
QFileInfo fi(sourcePath);
QString w = when.isEmpty() ? mWhen : when;
QPair<QString, QString> key = qMakePair<QString, QString>(fi.fileName(), w);
mCacheMx->lock();
QPixmap retval;
if(!mFrameCache->contains(key)){
QString nullPath = mFrameCache->value(qMakePair<QString, QString>(key.first, "00:00:00"));
if(!nullPath.isEmpty()){
mCacheMx->unlock();
return QPixmap(nullPath);
}
mCacheMx->unlock();
mSemFree->acquire();
mDataQueue->enqueue(qMakePair<QString, QString>(sourcePath, when));
mSemUsed->release();
return QPixmap();
}
retval = QPixmap(mFrameCache->value(key));
mCacheMx->unlock();
return retval;
}
const QString FrameCache::entryPath(const QString &sourcePath, const QString &when){
QFileInfo fi(sourcePath);
if(!fi.exists()){
return QString();
}
QPair<QString, QString> data = qMakePair<QString, QString>(fi.fileName(), when);
QMutexLocker l(mCacheMx);
return mFrameCache->value(data);
}
void FrameCache::rebuild(){
QMutexLocker l(mCacheMx);
QDir cdir(mGenerator->cacheDir());
QFileInfoList files = cdir.entryInfoList(QDir::Files);
mFrameCache->clear();
foreach(QFileInfo fi, files){
QString base = fi.fileName();
base.chop(fi.suffix().size() + 1); // basename doesn't work, b/c we have filenames w spaces
base.chop(7); //remove temp. extension
QString when = base.right(8);
base.chop(9); //remove when + _, leaving the orig. filename
QPair<QString, QString> key = qMakePair<QString, QString>(base, when);
if(mFrameCache->contains(key)){
QFile::remove(fi.absoluteFilePath());
}else{
mFrameCache->insert(key, fi.absoluteFilePath());
}
}
}
FrameCacheGenerator::FrameCacheGenerator(QObject *parent) : QThread(parent), mCacheSubDir(".frameCache"), mCacheFileName("cache") {}
void FrameCacheGenerator::init(QSemaphore *set, QSemaphore *get, QMutex *cachemx, QQueue<QPair<QString, QString> > *data, QHash<QPair<QString, QString>, QString> *cache){
mSemFree = set;
mSemUsed = get;
mDataQueue = data;
mCacheMx = cachemx;
mFrameCache = cache;
}
void FrameCacheGenerator::readConfig(){
QSettings s;
QString archive = s.value("paths/archivedir").toString();
if(archive.isEmpty()){
return;
}
QDir archiveDir(archive);
if(!archiveDir.exists(mCacheSubDir)){
archiveDir.mkdir(mCacheSubDir);
}
mCacheDir = QString("%1/%2").arg(archive).arg(mCacheSubDir);
mCacheFile = QString("%1/%2").arg(mCacheDir).arg(mCacheFileName);
mFfMpegPath = s.value("paths/ffmpeg").toString();
}
void FrameCacheGenerator::run(){
forever{
mSemUsed->acquire();
QPair<QString, QString> cur = mDataQueue->dequeue();
if(!grabFrame(cur.first, cur.second)){
grabFrame(cur.first, "00:00:00");
}
mSemFree->release();
}
}
bool FrameCacheGenerator::grabFrame(const QString &sourceFile, QString when){
QFileInfo sourceInfo(sourceFile);
if(!sourceInfo.exists()){
return false;
}
QString tmpTemplate = QString("%1/%2_%3-XXXXXX.png").arg(mCacheDir).arg(sourceInfo.fileName()).arg(when);
QTemporaryFile tempFile(tmpTemplate);
tempFile.setAutoRemove(false);
if(tempFile.open()){
QStringList ffMpegArgs = QStringList() << "-vframes" << "1" << "-ss" << when << "-i" << sourceFile << "-y" << tempFile.fileName();
QProcess ffmpeg;
ffmpeg.start(mFfMpegPath, ffMpegArgs);
if(!ffmpeg.waitForStarted()){
return false;
}
ffmpeg.waitForFinished();
QFileInfo tfi(tempFile.fileName());
if(tfi.size() == 0){
tempFile.remove();
return false;
}
QPair<QString, QString> pair(sourceInfo.fileName(), when);
mCacheMx->lock();
mFrameCache->insert(pair, tempFile.fileName());
mCacheMx->unlock();
return true;
}
return false;
}
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