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- amp MPEG audio decoder readme file (version 0.7.5)
- (C) Tomislav Uzelac 1996,1997
-
- amp is free software and can be _used_ freely by anyone. If you want to
- do anything else with it, be sure to check the Legal section of this
- document for legal issues.
-
- THERE IS NO WARRANTY FOR THIS PROGRAM. Please check out the Legal section
- of this document.
-
- 1. Introduction
- 2. Installation
- 3. Running
- 4. Feedback
- 5. Contributing
- 6. Legal
-
-
- 1. Introduction
-
- amp (Audio Mpeg Player) is an MPEG audio decoder which I originally started
- putting together as a side project of the MPEG hardware design project at
- FER/Zagreb - just to confirm my knowledge of the standard. It works with
- both MPEG1 and MPEG2 audio streams (except for the multichannel extensions
- defined in MPEG2), layers 2 and 3.
-
- There is a gui for amp, written in Tcl/Tk by Edouard Lafargue. It is
- available at the amp home site ftp://ftp.rasip.fer.hr
-
- Another gui supported is the Sajber Jukebox, written by Joel Lindholm.
-
- The following people contributed their time and knowledge to amp:
- Karl Anders Oygard, Ilkka Karvinen, Lutz Vieweg, Dan Nelson,
- Edouard Lafargue, Andrew Richards, George Colouris,
- Dmitry Boldyrev, Andy Lo A Foe, Thomas Sailer, Justin Frankel
-
- amp home location is
- ftp://ftp.rasip.fer.hr/pub/mpeg/
-
- and the mailing list: send 'HELP' in the body of the message to:
- multimedia@rasip.fer.hr
-
- If you want to find out more about MPEG, best places to start are
- http://www.mpeg.org
- http://www.mpeg2.de
-
-
- 2. Installation
-
- Installation should be simple enough if amp was ported to your system,
- just do a
-
- ./configure
- make
-
- You can edit the makefile further to suit your system. If configure fails
- to make a usable Makefile, you'll _have_ to edit it yourself.
-
- Linux users should try real-time playing support, as described
- in doc/realtime.txt. Some people that might pass on this feature are
- those with slower machines (i.e. 486's), or SMP systems (see the
- doc/linuxrealtime.txt file).
- Some versions of the linux C library produce an error when compiling
- amp with realtime support. A quick fix is to edit /usr/include/sched.h
- and replace _P in the offending line with __P.
-
- ./configure --enable-realtime
- make
- chown root.root amp
- chmod u+s amp
-
- ... this requires /dev/dsp to be both world readable and writeable. If you
- have a special group for people allowed to use the sound device (for
- instance, a group called sound), you can do a:
-
- chmod g+s amp
-
- or make your audio card world read/writeable (not recomended)
-
- chmod o+rw /dev/dsp*
-
- 3. Running:
-
- 'amp -h' gives you usage & options. If your computer is on the slower
- side, direct playback might not work, but you can decode it
- to .wav or raw pcm and play it later.
-
-
- 4. Feedback
-
- Send in your makefiles, opinions, bugreports, fixes; anything related to this
- program. You can also send me unlimited amounts of money, sugar, milk, etc.
-
- If you find any mpeg audio files that amp has trouble decoding, please tell
- me about this via e-mail <tuzelac@no.spam.please>.
-
-
- 5. Contributing
-
- Please contribute to amp. If you want to know what is going on in amp
- development, you can join the developers mailing list
-
- mpeg_audio_developers@rasip.fer.hr
-
- There are certain debugging facilities that I made in amp, but are disabled
- in the current release (they are neither nice nor user-friendly). If anyone
- enhances them (they are in dump.c) to the point that they're actually
- usable I'll be happy to include the changes in the release. I think this
- kind of debug output would be very useful to people studying these audio
- algorithms.
-
-
- 6. Legal
-
- This software can be used freely for any purpose. It can be distributed
- freely, as long as it is not sold commercially without permission from
- Tomislav Uzelac <tuzelac@no.spam.please>. However, including this software
- on CD_ROMs containing other free software is explicitly permitted even
- when a modest distribution fee is charged for the CD, as long as this
- software is not a primary selling argument for the CD.
-
- Building derived versions of this software is permitted, as long as they
- are not sold commercially without permission from Tomislav Uzelac
- <tuzelac@no.spam.please>. Any derived versions must be clearly marked as
- such, and must be called by a name other than amp. Any derived versions
- must retain this copyright notice.
-
- /* This license is itself copied from Tatu Ylonen's ssh package. It does
- * not mention being copyrighted itself :)
- */
-
- THERE IS NO WARRANTY FOR THIS PROGRAM - whatsoever. You use it entirely
- at your risk, and neither Tomislav Uzelac, nor FER will be liable for
- any damages that might occur to your computer, software, etc. in
- consequence of you using this freeware program.
-
-
- Tomislav Uzelac
- <tuzelac@no.spam.please>
-