media/libeffects/lvm/lib/Common/src/From2iToMono_32.cpp

/*
 * 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.
 */

/**********************************************************************************
   INCLUDE FILES
***********************************************************************************/

#include "VectorArithmetic.h"

/**********************************************************************************
   FUNCTION From2iToMono_32
***********************************************************************************/

void From2iToMono_32( const LVM_INT32 *src,
                            LVM_INT32 *dst,
                            LVM_INT16 n)
{
    LVM_INT16 ii;
    LVM_INT32 Temp;

    for (ii = n; ii != 0; ii--)
    {
        Temp = (*src>>1);
        src++;

        Temp +=(*src>>1);
        src++;

        *dst = Temp;
        dst++;
    }

    return;
}
#ifdef BUILD_FLOAT
void From2iToMono_Float( const LVM_FLOAT *src,
                         LVM_FLOAT *dst,
                         LVM_INT16 n)
{
    LVM_INT16 ii;
    LVM_FLOAT Temp;

    for (ii = n; ii != 0; ii--)
    {
        Temp = (*src);
        src++;

        Temp += (*src);
        src++;

        *dst = Temp / 2.0f;
        dst++;
    }

    return;
}
#ifdef SUPPORT_MC
/*
 * FUNCTION:       FromMcToMono_Float
 *
 * DESCRIPTION:
 *  Creates a mono stream from a multichannel input taking the avergae of
 *  sample values of all channels
 *
 * PARAMETERS:
 *  src            Source
 *  dst            Destination
 *  NrFrames       Number of frames
 *  NrChannels     Number of channels
 *
 * RETURNS:
 *  void
 *
 */
void FromMcToMono_Float(const LVM_FLOAT *src,
                        LVM_FLOAT *dst,
                        LVM_INT16 NrFrames,
                        LVM_INT16 NrChannels)
{
    LVM_INT16 ii, jj;
    LVM_FLOAT Temp;

    for (ii = NrFrames; ii != 0; ii--)
    {
        Temp = 0.0f;
        for (jj = NrChannels; jj !=0; jj--)
        {
            Temp += (*src);
            src++;
        }
        *dst = Temp / NrChannels;
        dst++;
    }

    return;
}
#endif

#endif
/**********************************************************************************/