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101 lines
3.3 KiB
C++
101 lines
3.3 KiB
C++
/**
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* @file
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* @brief Header file for Cache class
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* @author Jonathan Thomas <jonathan@openshot.org>
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*
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* @section LICENSE
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*
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* Copyright (c) 2008-2014 OpenShot Studios, LLC
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* <http://www.openshotstudios.com/>. This file is part of
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* OpenShot Library (libopenshot), an open-source project dedicated to
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* delivering high quality video editing and animation solutions to the
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* world. For more information visit <http://www.openshot.org/>.
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*
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* OpenShot Library (libopenshot) is free software: you can redistribute it
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* and/or modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* OpenShot Library (libopenshot) is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef OPENSHOT_CACHE_H
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#define OPENSHOT_CACHE_H
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#include <map>
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#include <deque>
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#include <tr1/memory>
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#include "CacheBase.h"
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#include "Frame.h"
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#include "Exceptions.h"
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namespace openshot {
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/**
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* @brief This class is a cache manager for Frame objects.
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*
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* It is used by FileReaders (such as FFmpegReader) to cache recently accessed frames. Due to the
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* high cost of decoding streams, once a frame is decoded, converted to RGB, and a Frame object is created,
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* it critical to keep these Frames cached for performance reasons. However, the larger the cache, the more memory
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* is required. You can set the max number of bytes to cache.
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*/
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class CacheMemory : public CacheBase {
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private:
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map<long int, tr1::shared_ptr<Frame> > frames; ///< This map holds the frame number and Frame objects
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deque<long int> frame_numbers; ///< This queue holds a sequential list of cached Frame numbers
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/// Clean up cached frames that exceed the max number of bytes
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void CleanUp();
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public:
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/// Default constructor, no max bytes
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CacheMemory();
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/// @brief Constructor that sets the max bytes to cache
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/// @param max_bytes The maximum bytes to allow in the cache. Once exceeded, the cache will purge the oldest frames.
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CacheMemory(int64 max_bytes);
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// Default destructor
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~CacheMemory();
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/// @brief Add a Frame to the cache
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/// @param frame The openshot::Frame object needing to be cached.
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void Add(tr1::shared_ptr<Frame> frame);
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/// Clear the cache of all frames
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void Clear();
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/// Count the frames in the queue
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long int Count();
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/// @brief Get a frame from the cache
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/// @param frame_number The frame number of the cached frame
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tr1::shared_ptr<Frame> GetFrame(long int frame_number);
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/// Gets the maximum bytes value
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int64 GetBytes();
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/// Get the smallest frame number
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tr1::shared_ptr<Frame> GetSmallestFrame();
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/// @brief Move frame to front of queue (so it lasts longer)
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/// @param frame_number The frame number of the cached frame
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void MoveToFront(long int frame_number);
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/// @brief Remove a specific frame
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/// @param frame_number The frame number of the cached frame
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void Remove(long int frame_number);
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};
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}
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#endif
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