Re: [MP3 ENCODER] l3psycho_anal
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
--
MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
--
MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
Re: [MP3 ENCODER] l3psycho_anal
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
--
MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
[MP3 ENCODER] l3psycho_anal
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 -- MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
