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README
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1997-05-09
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mpg123 0.58/dos beta 3 readme
This is a dos-port made by Tuomas Leikola, tobo@sci.fi.
Beta testing phase, so don't panic if it won't work. It propably will.
Some day.
please, if you make any modifications of bugfixes, share it with me :)
New versions available every now and then at http://www.sci.fi/~tobo/mpg123
...
currently supporting only sb16 compatibles. GUS will come.
ok the port code is messy, and many of the unix-related features
I removed could be done. You're welcome to do so. I am not paid
for doing this. I don't even care about the fame. I just needed something
to play my MP3gs in dos. That is what is happening now.
SB support is a lame hack. I know that.
GUS support has a funny problem. the DMA never starts. anyone care to tell
what could be the problem? (FYI: PIO is shit slow)
Buffering for the SB will come out some day. Or maybe not.
Hey i want something like this unix "diff" program.
Begin & end not handled properly.
Actually, a lot of things not handled properly.
No exit. (Ctrl-break)
About anything else, read on:
Original mpg123 "readme":
------------8<-------------------8<---------------------8<------------------
**********************************************************************
* MPEG 1.0 _AUDIO_ PLAYER, V0.58 *
* (full?) MPEG 1.0, Layer 1,2 and 3 support *
* Layer-3 realtime only with a 'fast' machine (e.g Sparc10) *
* Since 29.3.96 128kbit j-stereo on an amd 5x86-P75 (133Mhz), too ;) *
* Layer 1,2 stereo or Layer 3 with one channel seems to be *
* possible in realtime on a i486dx4-100 *
**********************************************************************
Please read first the important information in the COPYING file.
written/modfied by:
Michael Hipp (email: Michael.Hipp@student.uni-tuebingen.de)
Philipp Knirsch (email: phil@mpik-tueb.mpg.de)
-> still using an idea (the 'manual unroll') from Phil, though
his original code was replaced by a slightly faster code.
Uses code (or at least ideas) from:
MPEG Software Simulation Group (Base package)
Tobias Bading (subband synthesis)
Jeff Tsay (DCT36)
Philipp Knirsch (DCT36/manual unroll)
Thomas Woerner (SGI Audio)
Oliver Fromme <oliver.fromme@heim3.tu-clausthal.de>
(several enhancements, man pages, Makefile, FreeBSD port,License )
current original distribution site is:
http://www.sfs.nphil.uni-tuebingen.de/~hipp/mpg123.html
here's Oliver Fromme's mpg123 page:
http://www.heim3.tu-clausthal.de/~olli/mpg123/
(includes information about the mpg123 mailing list)
V0.58 plays a layer3,112Kbit/s,J-Stereo stream on my AMD 5x86/133Mhz
with about 73% CPU load.
If your machine isn't fast enough you may try the downsampling
feature (-2to1 and -4to1 options)
Playing in 'singlemix' (stero reduced to mono) also saves some
CPU cycles, though the whole code is optimized for 'full' stereo playing.
'Benchmarks': (+/- 2%)
----------------------
(AMD 5x86/133MHZ,ASUS SP3G,256KB cache,DIRTY-TAG installed,(BusLogic SCSI))
(Layer3, 112Kbit/s, J-Stereo stream)
(Compiled with: -DI386_ASSEM -DREAL_IS_FLOAT -DLINUX -Wall -O2 -m486
-fomit-frame-pointer -funroll-all-loops -finline-functions -ffast-math)
full quality: (stero) 72%
(singlemix) 42% (-> should work on 486DX66)
2:1 downsampling: (stereo) 59%
(singlemix) 35% (-> should work on 486DX50)
---------------------------------------------------------------------
Description:
This isn't a new player. It's a near fully rewritten version based on the
mpegaudio (FHG-version) package. The DCT algorithm in the
synthesis filter is a rewritten version of the DCT first seen in the maplay
package, which was written by Tobias Bading (bading@cs.tu-berlin.de). The
rewrite was neccassary, because the GPL may not allow this copyright mix.
The mpegaudio package was written by various people from the MPEG/audio
software simulation group. The maplay is under GPL .. You can find the
original sourcecode and the mpegaudio package on: ftp.tnt.uni-hannover.de.
You will find code from the mpegaudio package in:
layer3.c
common.c
mpg123.h
mpg123.c
I also often used the same variable names in the rewritten parts.
In the current layer3.c I'm using a DCT36 from Jeff Tsay's
(ctsay@pasteur.eecs.berkeley.edu) maplay 1.2+ package. His code is
under GPL ..
The output is always 'two channel interleaved'. If the input is a
a mono-stream or single-channel is enabled, the player duplicates
the channel. Currently, only (very simple) audiosupport for
Linux,HP7xx,SGI and SunOS/Solaris,FreeBSD systems.
I have tested the program with a lot of teststreams, but it's very
likely, that there are still a few bugs.
have fun,
Mike
----------------------------------------------------------------------------
Just for info:
I'm also working on a DSP port for this package.
A first testversion of the layer-2 part is finished and seems
to work in realtime with my 20MHZ ADSP-2115
----------------------------------------------------------------------------
Copyrights (c) 1995,1996,1997 of all changes/modifications and
of the new code by Michael Hipp. All rights reserved.
See the packages 'maplay 1.2(+)' and 'mpegaudio' for their copy-policies.
known bugs:
layer 3 i-stereo not heavily tested
btw: I'm looking for i-stereo teststreams .. maybe you could send me a few
Layer 1 not heavily tested
no CRC checking ..
no 'free format streams'
no clean audio interface
no MPEG 2.0 support
******************************************************************************
*
* This is software with ABSOLUTELY NO WARRANTY.
* Use it at your OWN RISK. It's possible to damage e.g. hardware or your hearing
* due to a bug or for other reasons.
*
* I do not warrant that the program is free of infringement of any third-party
* patents.
*
******************************************************************************
----------8<----------------------8<-------------------8<----------------------