buffer.h

瑞星微公司RK27XX系列芯片的SDK开发包

/* Copyright (C) 2007 ROCK-CHIPS FUZHOU . All Rights Reserved. */
/*
File : \Audio\buffer\
Desc : Buffer

Author : FSH
Date : 2007-06-01
Notes :

$Log :
* FSH    2007/06/01 建立此文件
*
* Vincent  2007/08/xx 少量改动
*/
/****************************************************************/

#ifndef _BUFFER_H_
#define _BUFFER_H_

//****************************************************************************
//
// 环形缓冲区的当前状态
//
//****************************************************************************
typedef struct sbs
{
    //
    // A pointer to the circular buffer containing the left channel data.
    //
    short *psLeft;

    //
    // A pointer to the circular buffer containing the right channel data.
    //
    short *psRight;

    //
    // The length of the circular buffer.
    //
    long lLength;

    //
    // The next point in the circular buffer where data will be read.
    //
    long lReadPtr;

    //
    // The next point in the circular buffer where data will be written.
    //
    long lWritePtr;

    //
    // The instance data for this buffer.
    //
    long lInstanceData;
} BufferState;

//****************************************************************************
//
// Function prototypes.
//
//****************************************************************************
extern void BufferInit(BufferState *psBuffer,
                           long(*pfnIoctl)(unsigned long ulIoctl,
                                           BufferState *psBuffer,
                                           unsigned long ulParam1,
                                           unsigned long ulParam2,
                                           unsigned long ulParam3),
                           long lInstanceData);
extern long BufferSetBuffer(BufferState *psBuffer, short *psLeft,
                                short *psRight, long lLength);
extern long BufferDataAvailable(BufferState *psBuffer);
extern long BufferSpaceAvailable(BufferState *psBuffer, int skip);
extern long BufferIsEmpty(BufferState *psBuffer);
extern long BufferGetWritePointer(BufferState *psBuffer, short **ppsLeft,
                                      short **ppsRight, long *plLength, int skip);
extern long BufferUpdateWritePointer(BufferState *psBuffer, long lLength, int skip);
extern long BufferGetReadPointer(BufferState *psBuffer, short **ppsLeft,
                                     short **ppsRight, long *plLength);
extern long BufferUpdateReadPointer(BufferState *psBuffer, long lLength);
extern long BufferUpdateReadPointerJS(BufferState *psBuffer, long lLength);
extern long BufferSetSampleRate(BufferState *psBuffer, long lSampleRate);


#endif // #ifndef _BUFFER_H_