T
137 lines
6.0 KiB
C
137 lines
6.0 KiB
C
/*
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* Copyright (C) 2004-2010 NXP Software
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __LVC_MIXER_H__
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#define __LVC_MIXER_H__
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#include "LVM_Types.h"
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/**********************************************************************************
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INSTANCE MEMORY TYPE DEFINITION
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***********************************************************************************/
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/* LVMixer3_st structure stores Instance parameters for one audio stream */
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typedef struct
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{
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LVM_INT32 PrivateParams[4]; /* Private Instance params for Audio Stream */
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LVM_INT16 CallbackSet; /* Boolean. Should be set by calling application each time the target value is updated */
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LVM_INT16 CallbackParam; /* Parameter that will be used in the calback function */
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void *pCallbackHandle; /* Pointer to the instance of the callback function */
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void *pGeneralPurpose; /* Pointer for general purpose usage */
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LVM_Callback pCallBack; /* Pointer to the callback function */
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} LVMixer3_st;
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typedef struct
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{
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LVMixer3_st MixerStream[1]; /* Instance Params for one Audio Stream */
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} LVMixer3_1St_st;
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typedef struct
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{
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LVMixer3_st MixerStream[2]; /* Instance Params for two Audio Streams */
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} LVMixer3_2St_st;
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typedef struct
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{
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LVMixer3_st MixerStream[3]; /* Instance Params for three Audio Streams */
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} LVMixer3_3St_st;
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/**********************************************************************************
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FUNCTION PROTOTYPES (HIGH LEVEL FUNCTIONS)
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***********************************************************************************/
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/* Function names should be unique within first 16 characters */
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#define LVMixer3_MixSoft_1St_D16C31_SAT LVMixer3_1St_D16C31_SAT_MixSoft
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#define LVMixer3_MixInSoft_D16C31_SAT LVMixer3_D16C31_SAT_MixInSoft
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#define LVMixer3_MixSoft_2St_D16C31_SAT LVMixer3_2St_D16C31_SAT_MixSoft
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#define LVMixer3_MixSoft_3St_D16C31_SAT LVMixer3_3St_D16C31_SAT_MixSoft
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/*** General functions ************************************************************/
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/**********************************************************************************/
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/* This time constant calculation function assumes the mixer will be called with */
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/* large block sizes. When the block size is small, especially if less than 4, */
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/* then the calculation will give an incorrect value for alpha, see the mixer */
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/* documentation for further details. */
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/* ********************************************************************************/
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void LVC_Mixer_SetTarget( LVMixer3_st *pStream,
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LVM_INT32 TargetGain);
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LVM_INT32 LVC_Mixer_GetTarget( LVMixer3_st *pStream);
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LVM_INT32 LVC_Mixer_GetCurrent( LVMixer3_st *pStream);
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void LVC_Mixer_Init( LVMixer3_st *pStream,
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LVM_INT32 TargetGain,
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LVM_INT32 CurrentGain);
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void LVC_Mixer_SetTimeConstant( LVMixer3_st *pStream,
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LVM_INT32 Tc_millisec,
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LVM_Fs_en Fs,
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LVM_INT16 NumChannels);
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void LVC_Mixer_VarSlope_SetTimeConstant( LVMixer3_st *pStream,
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LVM_INT32 Tc_millisec,
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LVM_Fs_en Fs,
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LVM_INT16 NumChannels);
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/*** 16 bit functions *************************************************************/
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void LVC_MixSoft_1St_D16C31_SAT( LVMixer3_1St_st *pInstance,
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const LVM_INT16 *src,
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LVM_INT16 *dst,
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LVM_INT16 n);
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void LVC_MixInSoft_D16C31_SAT( LVMixer3_1St_st *pInstance,
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LVM_INT16 *src,
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LVM_INT16 *dst,
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LVM_INT16 n);
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void LVC_MixSoft_2St_D16C31_SAT( LVMixer3_2St_st *pInstance,
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const LVM_INT16 *src1,
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LVM_INT16 *src2,
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LVM_INT16 *dst, /* dst cannot be equal to src2 */
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LVM_INT16 n);
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/**********************************************************************************/
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/* For applying different gains to Left and right chennals */
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/* MixerStream[0] applies to Left channel */
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/* MixerStream[1] applies to Right channel */
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/* Gain values should not be more that 1.0 */
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/**********************************************************************************/
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void LVC_MixSoft_1St_2i_D16C31_SAT( LVMixer3_2St_st *pInstance,
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const LVM_INT16 *src,
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LVM_INT16 *dst, /* dst can be equal to src */
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LVM_INT16 n); /* Number of stereo samples */
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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/**********************************************************************************/
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#endif //#ifndef __LVC_MIXER_H__
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