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/**
* @file
* @brief Header file for CacheBase class
* @author Jonathan Thomas <jonathan@openshot.org>
*
* @section LICENSE
*
* Copyright (c) 2008-2014 OpenShot Studios, LLC
* <http://www.openshotstudios.com/>. This file is part of
* OpenShot Library (libopenshot), an open-source project dedicated to
* delivering high quality video editing and animation solutions to the
* world. For more information visit <http://www.openshot.org/>.
*
* OpenShot Library (libopenshot) is free software: you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* OpenShot Library (libopenshot) 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef OPENSHOT_CACHE_BASE_H
#define OPENSHOT_CACHE_BASE_H
#include <memory>
#include "Frame.h"
#include "Exceptions.h"
#include "Json.h"
namespace openshot {
/**
* @brief All cache managers in libopenshot are based on this CacheBase class
*
* Cache is a very important element of video editing, and is required to achieve a high degree
* of performance. There are multiple derived cache objects based on this class, some which use
* memory, and some which use disk to store the cache.
*/
class CacheBase
{
protected:
string cache_type; ///< This is a friendly type name of the derived cache instance
int64_t max_bytes; ///< This is the max number of bytes to cache (0 = no limit)
/// Section lock for multiple threads
CriticalSection *cacheCriticalSection;
public:
/// Default constructor, no max bytes
CacheBase();
/// @brief Constructor that sets the max bytes to cache
/// @param max_bytes The maximum bytes to allow in the cache. Once exceeded, the cache will purge the oldest frames.
CacheBase(int64_t max_bytes);
/// @brief Add a Frame to the cache
/// @param frame The openshot::Frame object needing to be cached.
virtual void Add(std::shared_ptr<Frame> frame) = 0;
/// Clear the cache of all frames
virtual void Clear() = 0;
/// Count the frames in the queue
virtual int64_t Count() = 0;
/// @brief Get a frame from the cache
/// @param frame_number The frame number of the cached frame
virtual std::shared_ptr<Frame> GetFrame(int64_t frame_number) = 0;
/// Gets the maximum bytes value
virtual int64_t GetBytes() = 0;
/// Get the smallest frame number
virtual std::shared_ptr<Frame> GetSmallestFrame() = 0;
/// @brief Remove a specific frame
/// @param frame_number The frame number of the cached frame
virtual void Remove(int64_t frame_number) = 0;
/// @brief Remove a range of frames
/// @param start_frame_number The starting frame number of the cached frame
/// @param end_frame_number The ending frame number of the cached frame
virtual void Remove(int64_t start_frame_number, int64_t end_frame_number) = 0;
/// Gets the maximum bytes value
int64_t GetMaxBytes() { return max_bytes; };
/// @brief Set maximum bytes to a different amount
/// @param number_of_bytes The maximum bytes to allow in the cache. Once exceeded, the cache will purge the oldest frames.
void SetMaxBytes(int64_t number_of_bytes) { max_bytes = number_of_bytes; };
/// @brief Set maximum bytes to a different amount based on a ReaderInfo struct
/// @param number_of_frames The maximum number of frames to hold in cache
/// @param width The width of the frame's image
/// @param height The height of the frame's image
/// @param sample_rate The sample rate of the frame's audio data
/// @param channels The number of audio channels in the frame
void SetMaxBytesFromInfo(int64_t number_of_frames, int width, int height, int sample_rate, int channels);
/// Get and Set JSON methods
virtual string Json() = 0; ///< Generate JSON string of this object
virtual void SetJson(string value) = 0; ///< Load JSON string into this object
virtual Json::Value JsonValue() = 0; ///< Generate Json::JsonValue for this object
virtual void SetJsonValue(Json::Value root) = 0; ///< Load Json::JsonValue into this object
};
}
#endif
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