R: R: R: How to recompile mpg123 for the DaVinci on the host

Gabriele Filosofi GabrieleF at cosmed.it
Wed Sep 24 05:04:11 CDT 2008


Thanks.
Please, can you tell me where I can find the VLC source, and how should I build it?
I would like to try this package.

Gabriele

-----Messaggio originale-----
Da: amr ali [mailto:amraldo at hotmail.com]
Inviato: mercoledì 24 settembre 2008 9.41
A: Gabriele Filosofi
Cc: davinci-linux-open-source at linux.davincidsp.com
Oggetto: RE: R: R: How to recompile mpg123 for the DaVinci on the host



I am not sure about my answer, but I would like to share it with you:
1. mpg123 uses floating point which uses double processing power than fixed point
2. when you compile it on DMxxxx and run it, I guess it detects the generic code and not the optimizied one
3. I guess you need to look carefully at the options using the command mpg123  --longhelp to get more options, they might be useful

BR,
Amr Ali.
________________________________
> From: GabrieleF at cosmed.it
> To: amraldo at hotmail.com
> CC: davinci-linux-open-source at linux.davincidsp.com
> Date: Wed, 24 Sep 2008 09:24:34 +0200
> Subject: R: R: How to recompile mpg123 for the DaVinci on the host
>
>
> The effect I described seems to be due to a insufficient cpu processing power.
>
> Infact, I've noticed that the file is played fine if I enable buffering. To do that I can use a mpg123 built-in command:
>
>
>
> $ mpg123  -b  1024  song.mp3
>
>
>
> In this case it starts playing after a initial delay, and the interruptions occour later with a periodicity proportional to the buffer size (1KB in the example).
>
> All that is correct, because interruptions correspond to buffer full conditions.
>
> About this, on the mpg123 web site I read:
>
>
>
> "A recent test (GNU/Linux OS) with 0.60-beta2 showed 3% to 4% CPU usage on decoding high quality VBR MP3 with a pentiumII laptop with 366MHz, while a pentium 100MHz can easily handle two mpg123 instances in realtime (plus the mixing daemon that works on decoded data)"
>
>
>
> Now, I'm wandering a 256 MHz running arm core inside the DM6441 has not processing power enough to do the job.
>
> Have any idea about this issue?
>
>
>
> Gabriele
>
>
>
> Da: amr ali [mailto:amraldo at hotmail.com]
> Inviato: martedì 23 settembre 2008 22.17
> A: Gabriele Filosofi
> Cc: davinci-linux-open-source at linux.davincidsp.com
> Oggetto: RE: R: How to recompile mpg123 for the DaVinci on the host
>
>
>
> Hi,
> I have noticed that at high bit rates (~128 KBPS)!!!
> When using VLC it plays fine, with mpg123 I get the effect you described.
> BR,
> Amr Ali.
>
>
>
>
>
>
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>
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