//****************************************************************************//// VOLUME.H - Contains function prototypes for the routines in the volume//            control.//// Copyright (c) 1999,2000,2001 Cirrus Logic, Inc.////****************************************************************************#include "buffer/buffer.h"//****************************************************************************//// The persistent state of the volume control.////****************************************************************************typedef struct{    //    // The scalar for the current volume setting.    //    unsigned short usVolume;    //    // A boolean which is true if the audio should be passed through the volume    // control.    //    unsigned short bProcessAudio;    //    // The buffer from which we receive input data.    //    BufferState sInputBuffer;    //    // The buffer to which we send output data.    //    BufferState *pOutputBuffer;} tVolumeControl;//****************************************************************************//// Function prototypes.////****************************************************************************extern void VolumeInit(tVolumeControl *pVol, BufferState *pOutputBuffer);extern void VolumeAdjust(tVolumeControl *pVol, long lGain);extern void VolumeEnable(tVolumeControl *pVol);extern void VolumeDisable(tVolumeControl *pVol);extern BufferState *VolumeGetInputBuffer(tVolumeControl *pVol);