Re: Sound question

[mjmahon@aol.com (Michael J. Mahon)]

Lynn Crumbling noted:

>"Rich J." wrote:
>
>> left_the_scene <postmaster@nyc-strip-clubs.com> wrote in message
>news:<3C470621.8010200@nyc-strip-clubs.com>...
>> > Anyone know of a way to convert MP3's to a format playable on a IIgs?
>> >
>> > If so, what format do they convert to and what do I need software wise
>> > on the iigs side to play the converted files?
>> >
>>
>> Convert it to a WAV file (I'm pretty sure, It's been a while).
>>
>> A regular sound editor or player should play it back.
>>
>> The WAV file is going to be humungous.  The MP3 format is
>> a compression algorithm that crams a song into a smaller
>> area on the disk.  A WAV file is not compressed.
>>
>> Will it be worth the effort?  I don't know.
>>
>> How about a 65816 MP3 decoder?  Not likely that it will
>> ever happen.  I don't know how much CPU power you need
>> to play MP3s
>>
>> Rich
>
>My P133 could barely pull off decoding. If downmixed, a P100 could pull it
>off, with some skips.

Realtime decoding is out, but it is certainly possible to write an
off-line MP3 decoder that would output, say, stereo 8-bit samples
at a sampling rate of 22.050KHz for reasonable fidelity, or even
11.025KHz for "AM stereo" fidelity, and a 2:1 saving in disk space.

An option to fold the stereo samples to mono would save another
factor of two.

There are real-time players for the IIgs that can play at least
11.025KHz mono from hard disk--and I would think that stereo
would also be possible at this rate.  Perhaps a good use for
DMA disk transfers.  ;-)

-michael

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