82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
|
/*******************************************************************************
|
||
|
|
/
|
||
|
|
/ File: BufferGroup.h
|
||
|
|
/
|
||
|
|
/ Description: A BBufferGroup organizes sets of BBuffers so that you can request
|
||
|
|
/ and reclaim them.
|
||
|
|
/
|
||
|
|
/ Copyright 1997-98, Be Incorporated, All Rights Reserved
|
||
|
|
/
|
||
|
|
*******************************************************************************/
|
||
|
|
|
||
|
|
#if !defined(_BUFFER_GROUP_H)
|
||
|
|
#define _BUFFER_GROUP_H
|
||
|
|
|
||
|
|
#include <MediaDefs.h>
|
||
|
|
|
||
|
|
struct _shared_buffer_list;
|
||
|
|
|
||
|
|
class BBufferGroup
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
|
||
|
|
BBufferGroup(
|
||
|
|
size_t size,
|
||
|
|
int32 count = 3,
|
||
|
|
uint32 placement = B_ANY_ADDRESS,
|
||
|
|
uint32 lock = B_FULL_LOCK);
|
||
|
|
explicit BBufferGroup();
|
||
|
|
BBufferGroup(
|
||
|
|
int32 count,
|
||
|
|
const media_buffer_id * buffers);
|
||
|
|
~BBufferGroup(); /* BBufferGroup is NOT a virtual class!!! */
|
||
|
|
|
||
|
|
status_t InitCheck();
|
||
|
|
|
||
|
|
/* use this function to add buffers you created on your own */
|
||
|
|
status_t AddBuffer(
|
||
|
|
const buffer_clone_info & info,
|
||
|
|
BBuffer ** out_buffer = NULL);
|
||
|
|
|
||
|
|
BBuffer * RequestBuffer(
|
||
|
|
size_t size,
|
||
|
|
bigtime_t timeout = B_INFINITE_TIMEOUT);
|
||
|
|
status_t RequestBuffer(
|
||
|
|
BBuffer * buffer,
|
||
|
|
bigtime_t timeout = B_INFINITE_TIMEOUT);
|
||
|
|
status_t RequestError(); /* return last RequestBuffer error, useful if NULL is returned */
|
||
|
|
|
||
|
|
status_t CountBuffers(
|
||
|
|
int32 * out_count);
|
||
|
|
status_t GetBufferList(
|
||
|
|
int32 buf_count,
|
||
|
|
BBuffer ** out_buffers);
|
||
|
|
|
||
|
|
status_t WaitForBuffers();
|
||
|
|
status_t ReclaimAllBuffers();
|
||
|
|
|
||
|
|
private:
|
||
|
|
/* in BeOS R5 this is a deprecated api, from BeOS R4 times */
|
||
|
|
status_t AddBuffersTo(BMessage * message, const char * name, bool needLock=true);
|
||
|
|
|
||
|
|
status_t InitBufferGroup(); /* used internally */
|
||
|
|
BBufferGroup(const BBufferGroup &); /* not implemented */
|
||
|
|
BBufferGroup& operator=(const BBufferGroup&); /* not implemented */
|
||
|
|
|
||
|
|
friend struct _shared_buffer_list;
|
||
|
|
|
||
|
|
status_t fInitError;
|
||
|
|
status_t fRequestError;
|
||
|
|
int32 fBufferCount;
|
||
|
|
_shared_buffer_list * fBufferList;
|
||
|
|
|
||
|
|
// this is a BBufferGroup specific semaphore used for reclaiming BBuffers of this group
|
||
|
|
// is also is a system wide unique identifier of this group
|
||
|
|
sem_id fReclaimSem;
|
||
|
|
|
||
|
|
uint32 _reserved_buffer_group_[9];
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif /* _BUFFER_GROUP_H */
|
||
|
|
|