OpenShot Library | libopenshot
0.1.9
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This class is a memory-based cache manager for Frame objects. More...
#include <CacheMemory.h>
Public Member Functions | |
void | Add (std::shared_ptr< Frame > frame) |
Add a Frame to the cache. More... | |
CacheMemory () | |
Default constructor, no max bytes. More... | |
CacheMemory (int64_t max_bytes) | |
Constructor that sets the max bytes to cache. More... | |
void | Clear () |
Clear the cache of all frames. More... | |
int64_t | Count () |
Count the frames in the queue. More... | |
int64_t | GetBytes () |
Gets the maximum bytes value. More... | |
std::shared_ptr< Frame > | GetFrame (int64_t frame_number) |
Get a frame from the cache. More... | |
std::shared_ptr< Frame > | GetSmallestFrame () |
Get the smallest frame number. More... | |
string | Json () |
Get and Set JSON methods. More... | |
Json::Value | JsonValue () |
Generate Json::JsonValue for this object. More... | |
void | MoveToFront (int64_t frame_number) |
Move frame to front of queue (so it lasts longer) More... | |
void | Remove (int64_t frame_number) |
Remove a specific frame. More... | |
void | Remove (int64_t start_frame_number, int64_t end_frame_number) |
Remove a range of frames. More... | |
void | SetJson (string value) |
Load JSON string into this object. More... | |
void | SetJsonValue (Json::Value root) |
Load Json::JsonValue into this object. More... | |
~CacheMemory () | |
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CacheBase () | |
Default constructor, no max bytes. More... | |
CacheBase (int64_t max_bytes) | |
Constructor that sets the max bytes to cache. More... | |
int64_t | GetMaxBytes () |
Gets the maximum bytes value. More... | |
void | SetMaxBytes (int64_t number_of_bytes) |
Set maximum bytes to a different amount. More... | |
void | SetMaxBytesFromInfo (int64_t number_of_frames, int width, int height, int sample_rate, int channels) |
Set maximum bytes to a different amount based on a ReaderInfo struct. More... | |
Additional Inherited Members | |
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string | cache_type |
This is a friendly type name of the derived cache instance. More... | |
CriticalSection * | cacheCriticalSection |
Section lock for multiple threads. More... | |
int64_t | max_bytes |
This is the max number of bytes to cache (0 = no limit) More... | |
This class is a memory-based cache manager for Frame objects.
It is used by FileReaders (such as FFmpegReader) to cache recently accessed frames. Due to the high cost of decoding streams, once a frame is decoded, converted to RGB, and a Frame object is created, it critical to keep these Frames cached for performance reasons. However, the larger the cache, the more memory is required. You can set the max number of bytes to cache.
Definition at line 48 of file CacheMemory.h.
CacheMemory::CacheMemory | ( | ) |
Default constructor, no max bytes.
Definition at line 34 of file CacheMemory.cpp.
CacheMemory::CacheMemory | ( | int64_t | max_bytes | ) |
Constructor that sets the max bytes to cache.
max_bytes | The maximum bytes to allow in the cache. Once exceeded, the cache will purge the oldest frames. |
Definition at line 42 of file CacheMemory.cpp.
CacheMemory::~CacheMemory | ( | ) |
Definition at line 50 of file CacheMemory.cpp.
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virtual |
Add a Frame to the cache.
frame | The openshot::Frame object needing to be cached. |
Implements openshot::CacheBase.
Definition at line 130 of file CacheMemory.cpp.
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Clear the cache of all frames.
Implements openshot::CacheBase.
Definition at line 278 of file CacheMemory.cpp.
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Count the frames in the queue.
Implements openshot::CacheBase.
Definition at line 290 of file CacheMemory.cpp.
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Gets the maximum bytes value.
Implements openshot::CacheBase.
Definition at line 193 of file CacheMemory.cpp.
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Get a frame from the cache.
frame_number | The frame number of the cached frame |
Implements openshot::CacheBase.
Definition at line 155 of file CacheMemory.cpp.
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Get the smallest frame number.
Implements openshot::CacheBase.
Definition at line 171 of file CacheMemory.cpp.
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Get and Set JSON methods.
Generate JSON string of this object
Implements openshot::CacheBase.
Definition at line 321 of file CacheMemory.cpp.
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Generate Json::JsonValue for this object.
Implements openshot::CacheBase.
Definition at line 328 of file CacheMemory.cpp.
void CacheMemory::MoveToFront | ( | int64_t | frame_number | ) |
Move frame to front of queue (so it lasts longer)
frame_number | The frame number of the cached frame |
Definition at line 252 of file CacheMemory.cpp.
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virtual |
Remove a specific frame.
frame_number | The frame number of the cached frame |
Implements openshot::CacheBase.
Definition at line 211 of file CacheMemory.cpp.
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Remove a range of frames.
start_frame_number | The starting frame number of the cached frame |
end_frame_number | The ending frame number of the cached frame |
Implements openshot::CacheBase.
Definition at line 217 of file CacheMemory.cpp.
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Load JSON string into this object.
Implements openshot::CacheBase.
Definition at line 353 of file CacheMemory.cpp.
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Load Json::JsonValue into this object.
Implements openshot::CacheBase.
Definition at line 376 of file CacheMemory.cpp.