Make FrameCache threaded

create snapshot pics in a separate thread. Also use the first frame
available if the clip isn't long enough for the configured frame.

1 files changed, 72 insertions, 0 deletions

diff --git a/framecache.h b/framecache.h
new file mode 100644
index 0000000..509fea6
--- /dev/null
+++ b/framecache.h
@@ -0,0 +1,72 @@
+/*
+  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.
+*/
+
+#ifndef FRAMECACHE_H
+#define FRAMECACHE_H
+
+#include <QThread>
+#include <QPair>
+#include <QHash>
+#include <QPair>
+#include <QQueue>
+#include <QString>
+
+class QSemaphore;
+class QMutex;
+class FrameCacheGenerator;
+
+class FrameCache : public QObject {
+    Q_OBJECT
+    public:
+        explicit FrameCache(QObject *parent = 0);
+        ~FrameCache();
+        const QPixmap entry(const QString &sourcePath, const QString &when = QString());
+        const QString entryPath(const QString &sourcePath, const QString &when);
+
+    private:
+        QHash<QPair<QString, QString>, QString> *mFrameCache;
+        QQueue<QPair<QString, QString> > *mDataQueue;
+        QString mCacheFile;
+        qint32 mMagic;
+        QSemaphore *mSemFree;
+        QSemaphore *mSemUsed;
+        QMutex *mCacheMx;
+        FrameCacheGenerator *mGenerator;
+        QString mWhen;
+};
+
+class FrameCacheGenerator : public QThread {
+    Q_OBJECT
+    public:
+        explicit FrameCacheGenerator(QObject *parent = 0);
+        void init(QSemaphore *set, QSemaphore *get, QMutex *cachemx, QQueue<QPair<QString, QString> > *data, QHash<QPair<QString, QString>, QString> *cache);
+        const QString cacheFile() const { return mCacheFile; }
+        qint32 magic() const { return mMagic; };
+        void readConfig();
+        void readCache();
+
+    public slots:
+        void run();
+
+    private:
+        bool grabFrame(const QString &sourceFile, QString when);
+        QSemaphore *mSemFree;
+        QSemaphore *mSemUsed;
+        QMutex *mCacheMx;
+        QQueue<QPair<QString, QString> > *mDataQueue;
+        QHash<QPair<QString, QString>, QString> *mFrameCache;
+        QString mCacheDir;
+        QString mCacheFile;
+        //QString mWhen;
+        QString mFfMpegPath;
+        const qint32 mMagic;
+        const QString mCacheSubDir;
+        const QString mCacheFileName;
+
+};
+
+#endif // FRAMECACHE_H