AHI — Retargetable Audio for AmigaOS et al.

• Introduction
• News & recent changes

  • What's new here?
• Support
• Downloads

  • Binaries
  • Source code

Introduction

Welcome to the new home of AHI!

AHI is (still!) the de facto standard audio subsystem for AmigaOS, MorphOS and AROS. It handles sound card arbitration and sharing, real-time audio mixing and virtual audio channel management.

AHI was written by Martin Blom more than ten years ago (the original site is still online!), while he was still an inexperienced student and didn't even know C, but had plenty of spare time that could be spent coding. The situation is quite different today, especially regarding that spare time part, but AHI is still being maintained and even improved upon once in a while. Over the years, lots of people have contributed to the project.

AHI is released under a mixed license, where the executable programs are covered by the GNU GPL license and the device/library is LGPL'ed, making it possible for non-free software to use the system without restrictions.

The GPL and LGPL give everyone the right to freely modify, enhance, hack and rebuild AHI, and also to redistribute the result to others. You are encouraged to do so!

AHI currently supports the following sound cards:

Drivers for more cards are constantly being developed. It's fun! Don't hesitate to try yourself if you're interested. See the support section below for information about where you can ask for help. The developer archives from the download section contain driver examples and skeletons that you are free to use in any way you want. They are in the public domain and not covered by the GPL and LGPL licenses.

News & recent changes

Here are all the major changes since the last stable release, v4:

• Anti-click mixing routines, which makes AHI search for a zero-crossing before playing a new note
• Playback of 32 bit samples.
• Multi-channel audio. Eight channels are supported.
• Support for four more architectures: MorphOS/PPC, AmigaOS4/PPC, Amithlon/ix86, AROS/ix86.
• Support for PowerPC accelerator cards (MorphOS and AmigaOS4 only).
• A new driver, device.audio, can be used to make all low-level AHI applications, which normally open AHI in exclusive mode, behave as if they used the high-level API which allows several AHI applications to work simultaneously.
• The 68000 processor is no longer supported; a 68020 or better is required.

For a full log of everything that has been updated, see the ChangeLog file below.

What's new here?

2006-10-18

The old v4 site is now online again at Lysator, so I added a link to it.

2006-07-28

Added the 2006-04-01 update that was previously lost in the disk crash.

2006-07-26

Unfortunately, it looks like Lysator's project web servers will be off-line for quite some time, perhaps forever. What a shame, considering that Lysator had Sweden's first web server online back in february 1993 — server number 10 in the world. AHI has now moved completely to Berlios; sadly, that means that the old v4 site is gone (at least until I can find a server that still runs Roxen 1.3).

2006-04-01

Sorry, no April Fools jokes this year either. Instead, there is a beta release of ahi.device v6.7 available. Please test!

2005-11-23

Added a new archive with extra drivers for m68k-amigaos, including the latest paula.audio, toccata.audio and more.

2005-11-20

AHI v6 is finally released and this page goes online!

Support

Over at Berlios, I've set up a user forum, a bug tracker and mailing lists, both for users and developers. The various forums on the Amiga community sites, like Amiga.org, AmigaWorld.Net, AROS-Exec and MorphZone to name just a few, are also great support resources.

Downloads

AHI is available for a wide number of Amiga-like systems. This page offers downloads of binaries for all supported architectures, online documentation and the complete source code.

Online documentation

The online documentation includes a subset of the formats it is available in. The downloadable binary packages also include documentation in DVI, AutoDoc and AmigaGuide formats.

Binaries

In case you have problems with the download links below, all packages are also available from the files section at Berlios. You will also find all old releases archived there.

Source code

The most recent source code release is available here or from Berlios.

The code is also available for anonymous Subversion checkout:

svn co svn://svn.berlios.de/arp2/ahi/ahisrc/branches/BRANCH_6 ahisrc-6

Or even better, create a local mirror using SVK, which makes it really easy to stay up-to-date, develop new features and send patches:

# Create a local mirror
svk mirror svn://svn.berlios.de/arp2/ahi/ahisrc/branches/BRANCH_6/ //mirror/ahisrc-6

# Sync it
svk sync //mirror/ahisrc-6

# Create a local branch
svk cp -p //mirror/ahisrc-6 //local/ahisrc-6

# Check out the local branch
svk co //local/ahisrc-6

# Work
cd ahisrc-6; emacs some-file; svk diff

# Stay updated
svk pull

# Check in your new code to the local branch
svk ci

# Create a patch for submission
svk push -P cool-feature

You can also register as a developer at Berlios and get direct write access to the repository.

In case you just want to browse around, the source code is also available via WebSVN or ViewCVS.

(If you think that this page looks like crap, your browser is either lacking CSS support, or you don't know your history. If the latter, use your browser or the links at the bottom to switch style sheet.)

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