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DecMPA_Callbacks Struct Reference
[Structures]

This structure contains pointers to the functions that are used to read the MP3 data during DecMPA_Decode. More...

#include <decmpa.h>

List of all members.

Public Attributes
long(*	Read )(void *pContext, void *pBuffer, long nBytes)
	Pointer to the function that is used to read data.
int(*	Seek )(void *pContext, long DestPos)
	Pointer to function that seeks to the specified data stream position.
long(*	GetLength )(void *pContext)
	Pointer to a function that returns the length of the data stream.
long(*	GetPosition )(void *pContext)
	Pointer to a function that returns the current position in the data stream.

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Detailed Description

This structure contains pointers to the functions that are used to read the MP3 data during DecMPA_Decode.

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Member Data Documentation

long( * Read)(void* pContext,void* pBuffer,long nBytes)

Pointer to the function that is used to read data. If this pointer is NULL, DecMPA will read from stdin and ignore the other callback functions. Parameters: pContext  context pointer that was passed to DecMPA_CreateUsingCallbacks pBuffer  buffer that the data should be stored into nBytes  number of bytes to read Returns : the number of bytes read or -1 if an error occurred. If the returned value is less than nBytes it is assumed that the end of the data stream was reached. Note: the function that the pointer points to should have the calling convention DECMPA_CC, i.e. it should be defined as: long DECMPA_CC MyReadFuncName(void* pContext,void* pBuffer,long nBytes);

int( * Seek)(void* pContext,long DestPos)

Pointer to function that seeks to the specified data stream position. This function pointer should be set to NULL if seeking is not supported. Parameters: pContext  context pointer that was passed to DecMPA_CreateUsingCallbacks DestPos  destination position, in bytes. Returns : nonzero if successful, 0 otherwise. Note: the function that the pointer points to should have the calling convention DECMPA_CC, i.e. it should be defined as: int DECMPA_CC MySeekFuncName(void* pContext,long DestPos);

long( * GetLength)(void* pContext)

Pointer to a function that returns the length of the data stream. This function pointer can be set to NULL if the length cannot be determined. Alternatively the function can return -1, Parameters: pContext  context pointer that was passed to DecMPA_CreateUsingCallbacks Returns : the length, in bytes. -1 if unknown. Note: the function that the pointer points to should have the calling convention DECMPA_CC, i.e. it should be defined as: long DECMPA_CC MyGetLengthFuncName(void* pContext);

long( * GetPosition)(void* pContext)

Pointer to a function that returns the current position in the data stream. This function pointer can only be NULL if Read is also NULL. Parameters: pContext  context pointer that was passed to DecMPA_CreateUsingCallbacks Returns : the current position, in bytes or -1 if an error occurred. Note: the function that the pointer points to should have the calling convention DECMPA_CC, i.e. it should be defined as: long DECMPA_CC MyGetPositionFuncName(void* pContext);

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The documentation for this struct was generated from the following file:

• decmpa.h

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