On a 48Mhz ARM7 processor using the MP3 library that ARM wrote and sells,
you can just do the decompression and audio output, but there isn't enough
bandwidth left to do much else.

So doing it on the GBA wouldn't be possible using the ARM hand-coded MP3
library.

-Aaron


> -----Original Message-----
> From: yerricde [mailto:d_yerrick@...]
> Sent: Tuesday, July 02, 2002 11:16 PM
> To: gbadev@yahoogroups.com
> Subject: [gbadev] Re: MP3 then.
>
>
> --- In gbadev@y..., "Nathan Grebowiec" <me@n...> wrote:
> > This device could be a lot cheaper if it decoded in software
> > and uses the GBA's headphone out...sure you wouldn't get GBC
> > support...but come on...life into now.
>
> I wouldn't be so sure. I doubt that a 16.77 MHz ARM7TDMI
> processor can decode 44 kHz stereo MP3 audio in real time.
>
> And it would have to have its own headphone out, even if it were
> GBA specific. Each channel of MP3 audio is normally decoded to a
> 16 bit per sample buffer. GBA sound is 8 bits per sample. They'd
> have to do a lot of noise-shaping to push all the noise up into the
> high frequencies.
>
> --
> Damian
>
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