MPEG-FAQ 4.0:
Maplay
From: "Tobias 'Doping' Bading" <bading@cs.tu-berlin.de>
This announcement has been posted to the following newsgroups:
alt.comp.compression, comp.compression, alt.binaries.multimedia,
comp.multimedia, alt.binaries.sounds.misc, de.alt.binaries.sounds
last edit: 6/23/94 14:36:07
Hi MPEG audio fans,
I'd like to announce the second release of my free, software-only MPEG
audio player maplay. Those of you who are already familiar with maplay 1.1
may take a look at the list of changes in version 1.2:
- required CPU time reduced by 50%
- support of 16 bit soundcarts under Linux
Implemented by Louis P. Kruger (lpkruger@phoenix.princeton.edu)
- 8 kHz u-law realtime playback on amd devices (SPARC 2/IPX/...)
or conversion to 8 kHz u-law to stdout
Based on an implementation by Jim Boucher (jboucher@flash.bu.edu)
- some bug-fixes (-u options, Solaris 2.3 problem, problems with older
GNU C++ releases, makedepend usage removed)
All in all version 1.2 is now capable of
- playing MPEG audio layer I or II streams on SPARC 10 (SunOS 4.1.3 or
Solaris 2.x), Silicon Graphics Indigo (IRIX 4.0.x or IRIX 5.x) and Linux
machines in nearly CD-quality. On a SPARC 10/40, maplay needs about
46% CPU time for realtime stereo playback and 26% for mono playback.
(maplay can't be compiled under IRIX 5.x because of the missing audio
library, but an IRIX 4.0.5F binary works under IRIX 5.x, too)
- playing these streams in 8 kHz u-law format on SPARC 2/IPX/...
(SunOS 4.1.x) machines using the amd device. On a SPARCstation IPX,
maplay needs about 43% CPU time for realtime mono playback.
- decoding streams to raw 16 bit pcm format at the frequency of the stream
(32, 44.1 or 48 kHz) or to 8 bit u-law format downsampled to 8 kHz.
The C++ sourcecode of maplay 1.2 and a short layer II MPEG audio stream
for testing purposes has been posted to alt.binaries.multimedia on 6/23/94.
The sources and some binaries are available via the ftp server
URL=ftp://ftp.cs.tu-berlin.de/incoming/maplay1.2/
It contains:
-rw-r--r-- 1 bading doping 4290 Jun 23 14:20 ANNOUNCEMENT
-rw-r--r-- 1 bading doping 95691 Jun 23 14:19 maplay1_2.tar.Z
-rwxr-xr-x 1 bading doping 96497 Jun 22 12:30 maplay_indigo.Z*
-rwxr-xr-x 1 bading doping 81469 Jun 22 12:12 maplay_sol2.Z*
-rwxr-xr-x 1 bading doping 88881 Jun 22 12:17 maplay_sunos4_1_3.Z*
-rwxr-xr-x 1 bading doping 93125 Jun 22 12:35 maplay_ulaw_sunos4_1_3.Z*
-rw-r--r-- 1 bading doping 372821 Jun 23 12:16 things.mp2
Due to slow Internet connections to this site, please use the mail server
mail-server@cs.tu-berlin.de. Send an email to this address with the contents
SEND incoming/maplay1.2/maplay1_2.tar.Z
and you will receive a mail with an uuencoded copy of the requested file.
Sending a mail containing "SEND help" returns a mail with more infos about
this mail server.
The available precompiled binaries are (in compressed format)
- maplay_sunos4_1_3.Z
for SPARCstations with a dbri device (e.g. SPARC 10, CD-quality)
under SunOS 4.1.x (created under SunOS 4.1.3)
- maplay_ulaw_sunos4_1_3.Z
for SPARCstations with an amd device (e.g. SPARC 2 or IPX, telephone
quality) under SunOS 4.1.x using 8 kHz u-law output
(created under SunOS 4.1.3)
- maplay_sol2.Z
for SPARCstations with a dbri device (e.g. SPARC 10, CD-quality)
under Solaris 2.x (created under Solaris 2.3 [= SunOS 5.3])
- maplay_indigo.Z
for Silicon Graphic Indigo machines (CD-quality)
under IRIX 4.0.x or IRIX 5.x (created under IRIX 4.0.5F)
To extract the source code, you may use "zcat maplay1_2.tar.Z | tar xvf -"
or "uncompress maplay1_2.tar.Z ; tar xvf maplay1_2.tar". Please take a look
at the README file next.
For a binary, you may use "uncompress maplay_sunos4_1_3.Z".
You may also take a look at the Internet Underground Music Archive (IUMA)
ftp server sunsite.unc.edu (152.2.22.81) in the directory
/pub/electronic-publications/IUMA/audio_utils/mpeg_players/Workstations
If you are also looking for an encoder, please take a look at the file
/pub/electronic-publications/IUMA/audio_utils/converters/source/mpegaudio.tar.Z
on the IUMA ftp server. It contains sources for an encoder and a decoder.
That's all for now,
Tobias Bading (bading@cs.tu-berlin.de)