Path: usenet.cise.ufl.edu!newsfeeds.nerdc.ufl.edu!news.ao.net!schenectady.netmonger.net!news.chicago.winstar.net!newspump.sol.net!news.execpc.com!newspeer.sol.net!howland.erols.net!newsfeed.corridex.com!nntp2.savvis.net!inetarena.com!not-for-mail From: Joern Reder Newsgroups: comp.lang.perl.announce,comp.lang.perl.modules Subject: ANNOUNCE: MPEG::MP3Play 0.09 Date: 26 Sep 1999 19:37:13 GMT Organization: Internet Arena Lines: 236 Approved: merlyn@stonehenge.com (comp.lang.perl.announce) Message-ID: <7slsl9$pkg$1@play.inetarena.com> Reply-To: joern@netcologne.de NNTP-Posting-Host: halfdome.holdit.com X-Disclaimer: The "Approved" header verifies header information for article transmission and does not imply approval of content. Xref: usenet.cise.ufl.edu comp.lang.perl.announce:372 comp.lang.perl.modules:13667 I just uploaded MPEG::MP3Play 0.09 to CPAN. Its final destination is: http://www.perl.com/CPAN/modules/by-authors/id/J/JR/JRED/MPEG-MP3Play-0.09.tar.gz Version 0.09 is a minor bugfix release. Mainly a few 'perl -w' warning messages are fixed. See the CHANGES section of the attached README for details. There are no changes to the interface. NAME MPEG::MP3Play - Perl extension for playing back MPEG music SYNOPSIS use MPEG::MP3Play; my $mp3 = new MPEG::MP3Play; $mp3->open ("test.mp3"); $mp3->play; $mp3->message_handler; DESCRIPTION This Perl module enables you to playback MPEG music. This README and the documention cover version 0.09 of the MPEG::MP3Play module. PREREQUISITES Xaudio SDK MPEG::MP3Play is build against the 3.0 version of the Xaudio SDK and uses the async interface of the Xaudio library. I don't know if older versions will work properly. The SDK is not part of this distribution, so get and install it first (http://www.xaudio.com/). Perl I built and tested this module using Perl 5.005_03. It should work also with Perl 5.004_04 and above, but I did not test this. If someone builds MPEG::MP3Play successfully with other versions of Perl, plesase drop me a note. Optionally used Perl modules samples/play.pl uses Term::ReadKey if it's installed. samples/handler.pl requires Term::ReadKey. samples/gtk*.pl require Gtk. DOWNLOADING You can download MPEG::MP3Play from any CPAN mirror. You will find it in the following directories: http://www.perl.com/CPAN/modules/by-module/MPEG/ http://www.perl.com/CPAN/modules/by-authors/id/J/JR/JRED/ You'll also find recent information and download links on my homepage: http://www.netcologne.de/~nc-joernre/ INSTALLATION First, generate the Makefile: perl Makefile.PL You will be prompted for the location of the Xaudio SDK. The directory must contain the include and lib subdirectories, where the Xaudio header and library files are installed. make make test ./runsample play.pl ./runsample handler.pl ./runsample gtk.pl ./runsample gtkhandler.pl ./runsample gtkinherit.pl ./runsample synopsis.pl make install SAMPLE SCRIPTS There are some small test scripts in the samples directory. You can run these scripts before 'make install' with the runsample script (or directly with 'perl', after running 'make install'). For runsample usage: see above. All scripts expect a mp3 file 'test.mp3' in the actual directory. play.pl Textmodus playback. Displays the timecode. Simple volume control with '+' and '-' keys. handler.pl Does generally the same as play.pl, but uses the builtin message handler. You'll see, that this solution is much more elegant. It *requires* Term::ReadKey. This script makes use of the debugging facility and is best documented so far. gtk.pl This script demonstrates the usage of MPEG::MP3Play with the Gtk module. It produces a simple window with a progress bar while playing back the test.mp3 file. gtkhandler.pl This script does the same as gtk.pl but uses the builtin message handler concept instead of implementing message handling by itself. Advantage of using the builtin message handler: no global variables are necessary anymore. Because 'runsample' uses '`perl -w'' you'll get a warning message here complaining about a subroutine redefinition. See the section USING THE BUILTIN MESSAGE HANDLER for a discussion about this. gtkinherit.pl This is 'gtkhandler.pl' but throwing no warnings, because it uses subclassing for implementing messages handlers. synopsis.pl This one proves that the usage shown in the SYNOPSIS *really* works ;) BASIC CONCEPT The concept of the Xaudio async API is based on forking an extra process (or thread) for the MPEG decoding and playing. The parent process controls this process by sending and recieving messages. This message passing is asynchronous. This module interface provides methods for sending common messages to the MPEG process, eg. play, pause, stop. Also it implements a message handler to process the messages sent back. Eg. every message sent to the subprocess will be acknowledged by sending back an XA_MSG_NOTIFY_ACK message (or XA_MSG_NOTIFY_NACK on error). Error handling must be set up by handling this messages. You will find detailed information about the interface of this module in its POD documentation. TODO - Win32 support - support of the full Xaudio API, with input/output modules, etc. - documentation: more details about the messages hashes Ideas, code and any help are very appreciated. BUGS Currently there are no known bugs. PROBLEMS AND REPORTING BUGS First check if you're using the most recent version of this module, maybe the bug you're about to report is already fixed. Also please read the documentation entirely. If you find a bug please send me a report. I will fix this as soon as possible. You'll make my life easier if you provide the following information along with your bugreport: - your OS and Perl version (please send me the output of 'perl -V') - exact version number of the Xaudio development kit you're using (including libc version, if this is relevant for your OS, e.g. Linux) - for bug reports regarding the GTK+ functionality I need the version number of your GTK+ library and the version number of your Perl Gtk module. If you have a solution to fix the bug you're welcome to send me a unified context diff of your changes, so I can apply them to the trunk. You'll get a credit in the Changes file. If you have problems with your soundsystem (you hear nothing, or the sound is chopped up) please try to compile the sample programs that are part of the Xaudio development kit. Do they work properly? If not, this is most likely a problem of your sound configuration and not a MPEG::MP3Play issue. Please check the Xaudio documentation in this case, before contacting me. Thanks. MPEG::MP3Play APPLICATIONS I'm very interested to know, if someone write applications based on MPEG::MP3Play. So don't hesitate to send me an email, if you like (or not like ;) this module. TESTED ENVIRONMENTS This section will list the environments where this module is known to function well: - Perl 5.005_03 and Perl 5.004_04, Linux 2.0.33 and Linux 2.2.10, Xaudio SDK 3.01 glibc6, gtk+ 1.2.3, Perl Gtk 0.5121 - FreeBSD 3.2 and 3.3. See README.FreeBSD for details about building MPEG::MP3Play for this platform. AUTHOR Joern Reder COPYRIGHT Copyright (C) 1999 by Joern Reder, All Rights Reserved. This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The Xaudio SDK is copyright by MpegTV,LLC. Please refer to the LICENSE text published on http://www.xaudio.com/. SEE ALSO perl(1), MPEG::MP3Info. CHANGES Revision history for Perl extension MPEG::MP3Play. 0.09 Fri Sep 26 1999, joern - The error messages thrown on exit of the Gtk+ sample scripts are gone. Thanks to Dermot Musgrove for his suggestions. I added a small chapter about preventing these error messages in the documentation. - 'runsample' now uses 'perl -w'. MPEG::MP3Play and all sample scripts should now work without throwing warning messages (except 'gtkhandler.pl' where this is intended). - There is a new sample script 'gtkinherit.pl' to demonstrate implementing message handlers by subclassing MPEG::MP3Play - README.FreeBSD added, thanks go to Bryan Collins for his detailed information - 'runsample' is now generated by Makefile.PL to ensure that the correct Perl interpreter is used