av/media/libeffects/lvm/lib/Common/src/LVC_Mixer.h

/*
 * Copyright (C) 2004-2010 NXP Software
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __LVC_MIXER_H__
#define __LVC_MIXER_H__


#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */


#include "LVM_Types.h"

/**********************************************************************************
   INSTANCE MEMORY TYPE DEFINITION
***********************************************************************************/

/* LVMixer3_st structure stores Instance parameters for one audio stream */
typedef struct
{
    LVM_INT32       PrivateParams[4];   /* Private Instance params for Audio Stream */
    LVM_INT16       CallbackSet;        /* Boolean.  Should be set by calling application each time the target value is updated */
    LVM_INT16       CallbackParam;      /* Parameter that will be used in the calback function */
    void            *pCallbackHandle;   /* Pointer to the instance of the callback function */
    void            *pGeneralPurpose;   /* Pointer for general purpose usage */
    LVM_Callback    pCallBack;          /* Pointer to the callback function */
} LVMixer3_st;

typedef struct
{
    LVMixer3_st     MixerStream[1];    /* Instance Params for one Audio Stream */
} LVMixer3_1St_st;

typedef struct
{
    LVMixer3_st     MixerStream[2];    /* Instance Params for two Audio Streams */
} LVMixer3_2St_st;

typedef struct
{
    LVMixer3_st     MixerStream[3];    /* Instance Params for three Audio Streams */
} LVMixer3_3St_st;

/**********************************************************************************
   FUNCTION PROTOTYPES (HIGH LEVEL FUNCTIONS)
***********************************************************************************/

/* Function names should be unique within first 16 characters  */
#define    LVMixer3_MixSoft_1St_D16C31_SAT   LVMixer3_1St_D16C31_SAT_MixSoft
#define    LVMixer3_MixInSoft_D16C31_SAT     LVMixer3_D16C31_SAT_MixInSoft
#define    LVMixer3_MixSoft_2St_D16C31_SAT   LVMixer3_2St_D16C31_SAT_MixSoft
#define    LVMixer3_MixSoft_3St_D16C31_SAT   LVMixer3_3St_D16C31_SAT_MixSoft


/*** General functions ************************************************************/

/**********************************************************************************/
/* This time constant calculation function assumes the mixer will be called with  */
/* large block sizes. When the block size is small, especially if less than 4,    */
/* then the calculation will give an incorrect value for alpha, see the mixer     */
/* documentation for further details.                                             */
/* ********************************************************************************/
void LVC_Mixer_SetTarget( LVMixer3_st *pStream,
                                LVM_INT32           TargetGain);

LVM_INT32 LVC_Mixer_GetTarget( LVMixer3_st *pStream);

LVM_INT32 LVC_Mixer_GetCurrent( LVMixer3_st *pStream);

void LVC_Mixer_Init( LVMixer3_st *pStream,
                                LVM_INT32           TargetGain,
                                LVM_INT32           CurrentGain);

void LVC_Mixer_SetTimeConstant( LVMixer3_st *pStream,
                                LVM_INT32           Tc_millisec,
                                LVM_Fs_en           Fs,
                                LVM_INT16           NumChannels);

void LVC_Mixer_VarSlope_SetTimeConstant( LVMixer3_st *pStream,
                                        LVM_INT32           Tc_millisec,
                                        LVM_Fs_en           Fs,
                                        LVM_INT16           NumChannels);

/*** 16 bit functions *************************************************************/

void LVC_MixSoft_1St_D16C31_SAT( LVMixer3_1St_st *pInstance,
                                  const LVM_INT16           *src,
                                        LVM_INT16           *dst,
                                        LVM_INT16           n);

void LVC_MixInSoft_D16C31_SAT( LVMixer3_1St_st *pInstance,
                                        LVM_INT16           *src,
                                        LVM_INT16           *dst,
                                        LVM_INT16           n);

void LVC_MixSoft_2St_D16C31_SAT( LVMixer3_2St_st *pInstance,
                                const LVM_INT16             *src1,
                                      LVM_INT16             *src2,
                                      LVM_INT16             *dst,  /* dst cannot be equal to src2 */
                                      LVM_INT16             n);

/**********************************************************************************/
/* For applying different gains to Left and right chennals                        */
/* MixerStream[0] applies to Left channel                                         */
/* MixerStream[1] applies to Right channel                                        */
/* Gain values should not be more that 1.0                                        */
/**********************************************************************************/
void LVC_MixSoft_1St_2i_D16C31_SAT( LVMixer3_2St_st         *pInstance,
                                const   LVM_INT16           *src,
                                        LVM_INT16           *dst,   /* dst can be equal to src */
                                        LVM_INT16           n);     /* Number of stereo samples */


#ifdef __cplusplus
}
#endif /* __cplusplus */

/**********************************************************************************/

#endif //#ifndef __LVC_MIXER_H__