Re: mpglib/mpg123 MP3 Decoding

Hi Thomas,

is there also a fixed point implementation available from mpglib or mpg123??
Or is this SHARP DSP already in fixed point?

cheers

Robert


-------- Original-Nachricht --------
Datum: Thu, 18 Jan 2007 01:37:45 +0100
Von: Thomas Orgis <[email protected]>
An: [email protected]
CC: 
Betreff: Re: [mp3encoder] mpglib/mpg123 MP3 Decoding

> Am Tue, 16 Jan 2007 13:08:21 +0100
> schrieb "Robert Leiking" <[email protected]>: 
> 
> > > There already was an attempt to make mpglib work on a SHARC 32bit DSP,
> > Maybe you could give me some more information about this stuff: 
> 
> Well, we started working on a branch of mpglib for this dsp. Including
> giving the result as 32bit float instead of converting to integers...
> Not too much changes were needed, actually. There were some bugs that
> arised from the fact that every data type on this dsp was 32 bits wide.
> Well, you can see what happened there via
> 
> http://mpg123.de/cgi-bin/viewvc.cgi/mpglib/sharc_dsp/
> 
> > 
> > > What do this members of the structure mp3data_struct in mpglib.h
> mean:"ssize, dsize, bsize, bsnum"?
> > >
> > > In this structure: Does "framesize","fsizeold" represent the number of
> samples within one mp3 frame (1152 for a Mp3 file, right?) or does it mean
> the length of a frame in bytes?
> > > 
> 
> These are for the frame data size. The number of of samples is normally
> 1152, but can be 576 or 384 ... that number should be the same throughout a
> file.
> Frame data size depends on the bitrate and can vary for VBR files (which
> consist of frames with differing bitrate values), short:
> 
> fr->framesize  = (long) tabsel_123[fr->lsf][2][fr->bitrate_index] *
> 144000;
> 
> ;-)
> 
> Alrighty then,
> 
> Thomas.
> 
> -- 
> Thomas Orgis - Source Mage GNU/Linux Developer
> (http://www.sourcemage.org) OrgisNetzOrganisation ---)=-
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