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void ff_vector_fmul_window_c(float *dst, const float *src0, const float *src1, const float *win, float add_bias, int len){

    int i;

    for(i=0; i<len; i++)

        dst[i] = src0[i]*win[len-i-1] + src1[i]*win[i] + add_bias;

}

static av_always_inline int float_to_int16_one(const float *src){

    int_fast32_t tmp = *(const int32_t*)src;

    if(tmp & 0xf0000){

        tmp = (0x43c0ffff - tmp)>>31;

        // is this faster on some gcc/cpu combinations?

//      if(tmp > 0x43c0ffff) tmp = 0xFFFF;

//      else                 tmp = 0;

    }

    return tmp - 0x8000;

}

    for(i=0; i<len; i++)

        dst[i] = float_to_int16_one(src+i);

}

void ff_float_to_int16_interleave_c(int16_t *dst, const float *src, long len, int channels){

    int i,j,c;

    if(channels==2){

        for(i=0; i<len; i++){

            dst[2*i]   = float_to_int16_one(src+i);

            dst[2*i+1] = float_to_int16_one(src+i+len);

    }else{

        for(c=0; c<channels; c++, src+=len)

            for(i=0, j=c; i<len; i++, j+=channels)

                dst[j] = float_to_int16_one(src+i);

    c->vector_fmul_window = ff_vector_fmul_window_c;

    c->float_to_int16_interleave = ff_float_to_int16_interleave_c;