CMSIS-DSP/ComputeGraph/cg/nodes/cpp/ToReal.h

/* ----------------------------------------------------------------------
 * Project:      CMSIS DSP Library
 * Title:        ToReal.h
 * Description:  Node to convert complex to reals
 *
 *
 * Target Processor: Cortex-M and Cortex-A cores
 * -------------------------------------------------------------------- 
 *
 * Copyright (C) 2021-2023 ARM Limited or its affiliates. All rights reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * 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
 *
 * 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 _TOREAL_H_ 
#define _TOREAL_H_

/*

Convert a stream of complex a 0 b 0 c 0 ...
to reals a b c ...
*/
template<typename IN, int inputSize,typename OUT,int outputSize>
class ToReal;

template<typename IN, int inputSize,int outputSize>
class ToReal<IN,inputSize,IN,outputSize>: public GenericNode<IN,inputSize,IN,outputSize>
{
public:
    ToReal(FIFOBase<IN> &src,FIFOBase<IN> &dst):GenericNode<IN,inputSize,IN,outputSize>(src,dst){
    };

    int prepareForRunning() final
    {
        if (this->willOverflow() ||
            this->willUnderflow()
           )
        {
           return(CG_SKIP_EXECUTION_ID_CODE); // Skip execution
        }

        return(0);
    };

    int run() final
    {
        IN *a=this->getReadBuffer();
        IN *b=this->getWriteBuffer();
        for(int i=0;i<outputSize;i++)
        {
            b[i]=a[2*i];
        }
        return(0);
    };


};

#endif