cinelerra/cachebase.h

   1 #ifndef CACHEBASE_H
   2 #define CACHEBASE_H
   3
   4
   5 #include "asset.inc"
   6 #include "linklist.h"
   7 #include "mutex.inc"
   8 #include <stdint.h>
   9
  10
  11 // Store rendered elements from files but not the files.
  12 // Drawing caches must be separate from file caches to avoid
  13 // delaying other file accesses for the drawing routines.
  14
  15
  16 class CacheItemBase : public ListItem<CacheItemBase>
  17 {
  18 public:
  19         CacheItemBase();
  20         virtual ~CacheItemBase();
  21
  22
  23
  24         virtual int get_size();
  25
  26 // asset_id - supplied by user if the cache is not part of a file.
  27 // Used for fast accesses.
  28         int asset_id;
  29 // path is needed since the item may need to be deleted based on file.
  30 // Used for deletion.
  31         char *path;
  32 // Number of last get or put operation involving this object.
  33         int age;
  34 // Starting point of item in asset's native rate.
  35         int64_t position;
  36 };
  37
  38
  39
  40 class CacheBase : public List<CacheItemBase>
  41 {
  42 public:
  43         CacheBase();
  44         virtual ~CacheBase();
  45
  46         int get_age();
  47
  48         void remove_all();
  49
  50 // Remove all items with the asset id.
  51         void remove_asset(Asset *asset);
  52
  53 // Insert item in list in ascending position order.
  54         void put_item(CacheItemBase *item);
  55
  56 // Get first item from list with matching position or 0 if none found.
  57         CacheItemBase* get_item(int64_t position);
  58
  59 // Called when done with the item returned by get_.
  60 // Ignore if item was 0.
  61         void unlock();
  62
  63 // Get ID of oldest member.
  64 // Called by MWindow::age_caches.
  65         int get_oldest();
  66
  67 // Delete oldest item.  Return 0 if successful.  Return 1 if nothing to delete.
  68         int delete_oldest();
  69
  70 // Calculate current size of cache in bytes
  71         int64_t get_memory_usage();
  72
  73         Mutex *lock;
  74 // Current position of search
  75         CacheItemBase *current_item;
  76 };
  77
  78
  79
  80 #endif