Counter overflow in ivas_ism_metadata_enc_fx()

Basic info

• Fixed point:
  • Encoder (fixed): 21cecc43

Bug description

Using the a very long file (basically any file longer than 32767 frames) cause an overflow in some counters in function ivas_ism_metadata_enc_fx()

the code is located after line 800:

    FOR( ch = 0; ch < nchan_ism; ch++ )
    {
        hIsmMeta[ch]->last_ism_metadata_flag = hIsmMeta[ch]->ism_metadata_flag;
        move16();

        IF( hIsmMeta[ch]->ism_metadata_flag == 0 )
        {
  >>>       hIsmMeta[ch]->ism_md_fec_cnt_enc = add( hIsmMeta[ch]->ism_md_fec_cnt_enc, 1 );
            move16();
        }
        ELSE
        {
            hIsmMeta[ch]->ism_md_fec_cnt_enc = 0;
            move16();
        }
        hIsmMeta[ch]->ism_md_inc_diff_cnt = add( hIsmMeta[ch]->ism_md_inc_diff_cnt, 1 );
        move16();
        hIsmMeta[ch]->ism_md_inc_diff_cnt = s_min( hIsmMeta[ch]->ism_md_inc_diff_cnt, ISM_MD_INC_DIFF_CNT_MAX );
        move16();
    }

cc @vasilache, @vaclav the same problem may be happening in float as well The datatype should be change or a limit should be added to ensure it doesn't overflow

Ways to reproduce

IVAS_cod -ISM 1 NULL 32000 16 longlongfile.wav bit