Function interpolate

libavcodec/twinvq.c:270–279

}

static void interpolate(float *out, float v1, float v2, int size)
{
    int i;
    float step = (v1 - v2)/(size + 1);

    for (i = 0; i < size; i++) {
        v2 += step;
        out[i] = v2;
    }
}

static inline float get_cos(int idx, int part, const float *cos_tab, int size)
{