The decision to encode in M/S or Stereo could be made in
l3psycho_anal, just after it determines the block type,
but this would make the routine even bigger :-)
Mark
>
> Gabriel Bouvigne schrieb am Don, 01 Jun 2000:
> > In the big (too big?) l3psycho_anal function, in the "determin final block
> > type" section, is there a way to know if the frame is m/s or stereo? I mean,
> > is there something like blocktype[chn] to know it?
> >
> >
> > Regards,
> >
> > --
> >
> > Gabriel Bouvigne - France
> > [EMAIL PROTECTED]
> > icq: 12138873
> >
> > MP3' Tech: www.mp3-tech.org
>
> Hi Gabriel,
>
> the decision to encode in M/S or Stereo is made in lame.c:
>
>
> /* use m/s gfc->stereo? */
> check_ms_stereo = (gfp->mode == MPG_MD_JOINT_STEREO);
> if (check_ms_stereo) {
> /* make sure block type is the same in each channel */
> check_ms_stereo =
>
>(gfc->l3_side.gr[0].ch[0].tt.block_type==gfc->l3_side.gr[0].ch[1].tt.block_type) &&
>
>(gfc->l3_side.gr[1].ch[0].tt.block_type==gfc->l3_side.gr[1].ch[1].tt.block_type);
> }
> if (check_ms_stereo) {
> /* ms_ratio = is like the ratio of side_energy/total_energy */
> FLOAT8 ms_ratio_ave;
> /* ms_ratio_ave = .5*(ms_ratio[0] + ms_ratio[1]);*/
> ms_ratio_ave = .25*(gfc->ms_ratio[0] + gfc->ms_ratio[1]+
> ms_ratio_prev + ms_ratio_next);
> if ( (ms_ratio_ave <.35) && (.5*(gfc->ms_ratio[0]+gfc->ms_ratio[1])<.45) )
> gfc->mode_ext = MPG_MD_MS_LR;
> }
> if (gfp->force_ms) gfc->mode_ext = MPG_MD_MS_LR;
>
> Robert
> --
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>
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