[Lame-dev] Downloading all the right files for 3.98

[Joe M. <jo...@te...>]

Hey,

  I would like to try installing the latest 3.98 to see if it solves
some problems I'm having, but I'm not sure how to get all the files I
need to compile it... can anybody give a hint on what command(s) I
should use (in linux) to get the right files?

Thanks!
-Joe Marty

-----Original Message-----
From: lam...@li...
[mailto:lam...@li...] On Behalf Of Alexander
Leidinger
Sent: Tuesday, October 09, 2007 5:31 AM
To: dianaloren
Cc: lam...@li...
Subject: Re: [Lame-dev] questions about lame API

Quoting dianaloren <dia...@gm...> (from Sun, 7 Oct 2007 =20
04:17:04 -0700 (PDT)):

>
>    I have been taking a look at the lame_encode_buffer_interleaved()
> function, but I still don't get too clear what should be the PCM input
(I'm
> sorry, I'm very new in this area).

It switches between left and right. IIRC it starts with the left =20
channel. So for 16bit stereo, it's 16bits left, then 16bits right, =20
then 16bits left, 16bits right, ...

>    For what I have been reading, the PCM should be basically the WAV
file.

No. It should be interleaved PCM samples. A WAV can contain a lot, not =20
only PCM samples.

> But how can I pass the WAV file as a short int PCM[]?? I haven't seen
any
> function for this in the lame.h... but I have seen how you do it in
the
> files in frontend/ ... but then you have to call lots of other
functions in
> other .c files. Is there an easier way?

You have to open a file yourself. Then you have to read the data. If =20
the data is already in the right format, you just feed it to lame. If =20
it is not in the right format, you have to convert it to the right =20
format yourself. The lame-lib is not a generic format conversation =20
library, but an mp3 encoding library. It does not know about formats =20
in files, only about PCM samples. In the frontend we have support for =20
a generic audio IO library (libsndfile), and we have some functions =20
which are able to read some simple file formats without this library.

If you don't know how the file format you have to use looks like, I =20
suggest to take a generic audio IO library, typically it is able to =20
provide the data in a interleaved PCM stream or separated PCM streams. =20
Which audio IO library you can use depends upon your needs and the =20
operating system, and is not related to LAME.

Hope this helps,
Alexander.

--=20
Removing the straw that broke the camel's back
does not necessarily allow the camel to walk again.

http://www.Leidinger.net    Alexander @ Leidinger.net: PGP ID =3D =
B0063FE7
http://www.FreeBSD.org       netchild @ FreeBSD.org  : PGP ID =3D =
72077137

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