void ff_aac_encode_tns_info(AACEncContext *s, SingleChannelElement *sce)
{
    TemporalNoiseShaping *tns = &sce->tns;
    int i, w, filt, coef_compress = 0, coef_len;
    const int is8 = sce->ics.window_sequence[0] == EIGHT_SHORT_SEQUENCE;
    const int c_bits = is8 ? TNS_Q_BITS_IS8 == 4 : TNS_Q_BITS == 4;

    if (!sce->tns.present)
        return;

    for (i = 0; i < sce->ics.num_windows; i++) {
        put_bits(&s->pb, 2 - is8, sce->tns.n_filt[i]);
        if (!tns->n_filt[i])
            continue;
        put_bits(&s->pb, 1, c_bits);
        for (filt = 0; filt < tns->n_filt[i]; filt++) {
            put_bits(&s->pb, 6 - 2 * is8, tns->length[i][filt]);
            put_bits(&s->pb, 5 - 2 * is8, tns->order[i][filt]);
            if (!tns->order[i][filt])
                continue;
            put_bits(&s->pb, 1, tns->direction[i][filt]);
            coef_compress = compress_coeffs(tns->coef_idx[i][filt],
                                            tns->order[i][filt], c_bits);
            put_bits(&s->pb, 1, coef_compress);
            coef_len = c_bits + 3 - coef_compress;
            for (w = 0; w < tns->order[i][filt]; w++)
                put_bits(&s->pb, coef_len, tns->coef_idx[i][filt][w]);
        }
    }
}