Porting SGI Audio Applications to Linux
I placed the ported programs and their sources on the Music Technology Department's FTP server at Bowling Green State University in Ohio, I then notified Dr. Hammer of our successes (he was pleased we had achieved so much), and I also advised NoTAM that their software was now available for Linux. NoTAM obtained the packages and placed them on their server, making the applications easily available to everyone. I also sent notices to the Csound mailing list and comp.os.linux.announce to inform the Linux community of the availability of these packages.
Since the releases were made public, development has continued. Working from our source packages and Richard's library code, the Swedish composer Reine Jonsson has contributed a version of Mix which now handles the popular WAV format sound files (the original Mix, along with the other NoTAM packages, supports only AIFF format files), while reducing loading times and enhancing playback smoothness (a critical factor on my 486/120). A new version of Ceres (see Figure 2) called Ceres2 is in development by Johnathan Lee and should be available in a Linux port by the time this article is published.
Improvements can still be made: the applications ported so far are reasonably stable but will sometimes crash for no apparent reason. In some cases, not all of the original functionality is available, particularly if the package uses routines specific to the SGI's audio hardware capabilities. The Mix source code, for instance, includes calls to the SGI MIDI interface, but a replacement library for those calls has yet to be written. For now, I have had to disable the MIDI control code in the Mix sources. I have received a substantial amount of mail from users who have expressed interest in seeing more of this porting development, and my hopes are high that we will soon have a replacement for the SGI MIDI libraries to add to the audio and audiofile libraries already supported.
It must be mentioned that the NoTAM packages are not the only sources for high-quality UNIX audio-processing software available for possible porting. Guenter Geiger has successfully ported Paul Lansky's RT, another real-time, sound file mixer with excellent scripting capabilities. Work proceeds on ports of Paul Lansky's Ein (a DSP scratch pad), Mara Helmuth's Patchmix (a graphic patcher for the Cmix audio-processing language), and Russell Pinkston's XPatchWork (similar to Patchmix, but using the Csound language). Many other audio-related packages are available for Linux, and the interested reader should look at the Linux Soundapps web page for a continuously updated and comprehensive listing.
When I first used Linux I was thrilled by its possibilities, but dismayed by the lack of high-quality sound-processing software. Nevertheless, I was inspired by the availability of source code and the willingness of the Linux community to help develop audio applications. Since I am not a programmer, I relied on the skill, experience and advice of Linux users around the world. Like Linux itself, these projects were developed by a distributed collaborative effort, heavily dependent on the Internet for all communication, and built with freely available tools and libraries.
Thanks to Dr. Oyvind Hammer, Richard Kent, the LessTif developers and the XFree86 project, Linux audio software grows in quantity and quality almost daily. I encourage interested developers to contact me and let me know what they're working on or what they wish to work on. Many projects are waiting for developers who would like to contribute their talent and interest to the rapidly growing Linux audio and music software base.
by Richard Kent
When I first heard of Dave's project to port audio applications from an SGI-based environment to Linux, I was very interested in becoming involved—particularly because the sheer dearth of audio applications for UNIX was the primary reason for programming the Digital Audio Processor. I initially implemented DAP for SGI-based systems, but shortly before Dave contacted me, I successfully ported DAP to run in a Linux-based environment. (See Figure 3.) This experience helped greatly when porting the NoTAM applications. This sidebar is intended to detail the three main technical considerations when attempting such ports.
Practical Task Scheduling Deployment
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
Free to Linux Journal readers.View Now!
|The Firebird Project's Firebird Relational Database||Jul 29, 2016|
|Stunnel Security for Oracle||Jul 28, 2016|
|SUSE LLC's SUSE Manager||Jul 21, 2016|
|My +1 Sword of Productivity||Jul 20, 2016|
|Non-Linux FOSS: Caffeine!||Jul 19, 2016|
|Murat Yener and Onur Dundar's Expert Android Studio (Wrox)||Jul 18, 2016|
- Stunnel Security for Oracle
- The Firebird Project's Firebird Relational Database
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- SUSE LLC's SUSE Manager
- Managing Linux Using Puppet
- My +1 Sword of Productivity
- Non-Linux FOSS: Caffeine!
- Doing for User Space What We Did for Kernel Space
- Google's SwiftShader Released
- SuperTuxKart 0.9.2 Released
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide