# Ap4Interfaces.h File Reference

`#include "Ap4Types.h"`

Go to the source code of this file.

## Classes
class | AP4_Exception
class | AP4_Referenceable
## Defines
#define | AP4_RELEASE(o) do { if (o) (o)->Release(); (o) = NULL; } while (0)
#define | AP4_ADD_REFERENCE(o) do { if (o) (o)->AddReference(); } while (0)

## Define Documentation

#define AP4_ADD_REFERENCE | ( | o |  | ) | do { if (o) (o)->AddReference(); } while (0)

Definition at line 41 of file Ap4Interfaces.h.

#define AP4_RELEASE | ( | o |  | ) | do { if (o) (o)->Release(); (o) = NULL; } while (0)

Definition at line 40 of file Ap4Interfaces.h.