[FFmpeg-devel] [PATCH 2/2] imdct15: replace the FFT with a faster PFA FFT algorithm

[Peter Barfuss]

> +    /* 15-point FFT exptab */
> +    for (i = 0; i < 19; i++) {
> +        if (i < 15) {
> +            double theta = 2 * M_PI * i / 15;
> +            s->exptab[i].re = cos(theta);
> +            s->exptab[i].im = sin(theta);
> +        } else { /* Wrap around to simplify fft[1]5 */
> +            s->exptab[i] = s->exptab[i - 15];

Slightly surprised that you don't just leave these
pregenerated/hardcoded as it's just 24 float values. Is this for ease
of making a fixed-point version later, or some other reason?