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Short: Retargetable audio v4.16, Developer's Archive
Author: Martin Blom <lcs@lysator.liu.se>
Uploader: Martin Blom <lcs@lysator.liu.se>
Type: dev/misc
This archive contains the developer documentation and
example source code for AHI, both for programmer who wish
to use AHI in their own applications and those who want
to write hardware drivers.
Changes since last release
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
Bug fixes in the device code.
Updated documentation.
New translation (hrvatski).
Added driver for Maestro Pro to the distribution.
Added driver for Concierto to the distribution.
TITLE
AHI Audio system
VERSION
Release 4
AUTHOR
Martin Blom <lcs@lysator.liu.se>
DESCRIPTION
Retargetable Audio for AmigaOS
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
(When refering to this software, the correct term is
'AHI audio system' or just 'AHI', never 'Audio Hardware
Interface'! 'AHI' is pronounced 'atchii', as in 'God bless!'.)
Starting with version 3 of AHI, the MC68000 processor is also supported.
However, many features are lacking:
· Very limited volime control when using 16 bit samples
· No HiFi mixing routines are available.
· No stereo samples
· No DSP effects are available.
· Less precision on some calculations
· Slower
As you can see, this version is very primitive. Get yourself an
accelerator! I cannot guarantee that I will continue to support this
processor in the future.
Quick overview
¯¯¯¯¯¯¯¯¯¯¯¯¯¯
* Driver based
Each supported sound card is controlled by a library-based audio
driver. For a 'dumb' sound card, a new driver should be written in
a few hours. For a 'smart' sound card, it is possible to utilize an
on-board DSP, for example, to maximize performance and sound quality.
For sound cards with own DSP but little or no memory, it is possible
to use the main CPU to mix channels and do the post-processing
with the DSP. Available today are drivers for
· Aura (sampler only)
· Clarity (sampler only)
· Concierto (Picasso IV sound module)
· Delfina DSP and Delfina Lite
· DraCo Motion
· Maestro Pro
· Melody MPEG
· Paula (8/14/14c bit)
· Prelude
· Toccata
· Wavetools
· 8SVX (mono) and AIFF/AIFC (mono & stereo) sample render
* Fast, powerful mixing routines (yeah, right... haha)
The device's mixing routines mix 8- or 16-bit signed samples, both
mono and stereo, located in Fast-RAM and outputs 16-bit mono or stereo
(with stereo panning if desired) data, using any number of channels
(as long as 'any' means less than 128...). Tables can be used speed
the mixing up (especially when using 8-bit samples). The samples can
have any length (including odd) and can have any number of loops.
* Support for non-realtime mixing
By providing a timing feature, it is possible to create high-
quality output even if the processing power is lacking, by saving
the output to disk, for example as an IFF AIFF or 8SXV file.
There are so-called HiFi mixing routines that can be used, which
use linear interpolation and gives 32 bit output.
* Audio database
Uses ID codes, much like Screenmode IDs, to select the many
parameters that can be set. The functions to access the audio
database are not too different from those in 'graphics.library'.
The device also features a requester to get an ID code from the
user.
* Both high- and low-level protocol
By acting both like a device and a library, AHI gives the programmer
a choice between full control and simplicity. The device API allows
several programs to use the audio hardware at the same time, and
the AUDIO: dos-device driver makes playing and recording sound very
simple for both the programmer and user.
* Future Compatible
When AmigaOS gets device-independent audio worth it's name, it should
not be too difficult to write a driver for AHI, allowing applications
using 'ahi.device' to automatically use the new OS interface. At
least I hope it wont.
SPECIAL REQUIREMENTS
AmigaOS release 2.
MC68020 processor or better strongly recommended.
AVAILABILITY
Aminet, for example:
ftp://ftp.germany.aminet.org/pub/aminet/dev/misc/ahidev.lha
ftp://ftp.germany.aminet.org/pub/aminet/mus/misc/ahiusr.lha
ftp://ftp.germany.aminet.org/pub/aminet/docs/misc/ahiman.lha
WWW:
http://www.lysator.liu.se/~lcs/ahi.html
PRICE
Free. But if you use it in a shareware of commercial product,
I would like a registered copy for me and each of the audio driver
authors (this is merely a wish, you don't have to do it if you don't
think we deserve it). See the AHI User's Guide for more information.
DISTRIBUTABILITY
Copyright ©1994-1997 Martin Blom.
Freely distributable in unmodified form.
See the AHI User's Guide for more information.
============================= Archive contents =============================
Original Packed Ratio Date Time Name
-------- ------- ----- --------- -------- -------------
632 274 56.6% 08-Aug-97 17:39:30 AHI.info
5108 2347 54.0% 04-Nov-97 23:05:26 +ahidev.readme
468 236 49.5% 08-Aug-97 17:39:30 +ahidev.readme.info
364 219 39.8% 21-Mar-97 20:13:22 +Copyright
468 229 51.0% 08-Aug-97 17:39:30 +Copyright.info
65297 17904 72.5% 04-Nov-97 22:59:54 +ahi.doc
75989 19168 74.7% 04-Nov-97 22:59:56 +ahi.guide
79854 19388 75.7% 04-Nov-97 23:00:00 +ahi.html
23055 6921 69.9% 04-Nov-97 23:00:02 +ahi_sub.doc
26982 7542 72.0% 04-Nov-97 23:00:04 +ahi_sub.guide
27939 7610 72.7% 04-Nov-97 23:00:06 +ahi_sub.html
51689 15021 70.9% 04-Nov-97 23:14:14 +devguide.guide
1373 437 68.1% 17-Sep-96 11:08:26 +asmfuncs.a
22993 5881 74.4% 29-Apr-97 09:39:48 +filesave.c
2432 966 60.2% 08-Sep-96 14:26:28 +filesave.h
594 279 53.0% 08-Sep-96 14:26:42 +filesave.i
2074 415 79.9% 02-Jun-97 12:26:46 +prefsfile.a
1525 621 59.2% 03-Jul-97 16:04:22 +smakefile
920 372 59.5% 05-Jul-97 12:39:18 +macros.i
408 172 57.8% 05-Jul-97 16:49:50 +Makefile
362 107 70.4% 05-Jul-97 15:50:02 +debug.a
84028 21004 75.0% 08-Oct-97 22:46:22 +paula_audio.a
7519 706 90.6% 31-Oct-97 16:02:24 +prefsfile.a
998 415 58.4% 07-Jul-97 23:16:50 +smakefile
7029 2218 68.4% 27-May-97 21:23:40 +asmfuncs.a
3038 418 86.2% 18-May-97 15:53:12 +prefsfile.a
1452 631 56.5% 12-Aug-97 21:39:32 +smakefile
19507 5044 74.1% 13-Aug-97 06:43:12 +toccata.c
1046 417 60.1% 23-Apr-97 21:19:50 +toccata.h
649 301 53.6% 23-Apr-97 21:19:54 +toccata.i
5794 2372 59.0% 23-Dec-95 12:19:54 +dad_audio.i
1098 625 43.0% 03-Jul-97 16:36:20 +log.ascii
98 74 24.4% 08-Feb-97 19:20:50 +makeit
2130 385 81.9% 03-Jul-97 16:34:04 +prefsfile.a
487 260 46.6% 03-Jul-97 16:35:16 +smakefile
693 403 41.8% 15-Feb-97 01:29:44 +wavetools.audio.readme
26557 6912 73.9% 03-Jul-97 16:32:26 +wavetools_audio.a
987 506 48.7% 09-Apr-97 01:54:16 +AHI-Handler.DICE
30792 7674 75.0% 09-Apr-97 01:55:50 +main.c
3960 1248 68.4% 12-Mar-97 16:28:54 +main.h
60110 15947 73.4% 09-Apr-97 01:55:50 +main.c,v
199 137 31.1% 05-Jul-97 16:54:20 +smakefile
407 173 57.4% 05-Jul-97 16:55:20 +Makefile
2916 1945 33.2% 04-Nov-97 22:49:34 +PlayTest
3579 1451 59.4% 08-Apr-97 23:34:36 +PlayTest.c
138 119 13.7% 26-Mar-97 02:07:36 +SCOPTIONS
306 168 45.0% 02-Jul-97 10:29:48 +smakefile
2736 1833 33.0% 04-Nov-97 22:49:46 +RecordTest
2724 1136 58.2% 08-Apr-97 23:34:26 +RecordTest.c
138 119 13.7% 03-Nov-96 19:22:44 +SCOPTIONS
308 169 45.1% 02-Jul-97 10:29:54 +smakefile
2340 1640 29.9% 04-Nov-97 22:52:04 +CheckAHIPrefs
1965 796 59.4% 02-Nov-97 23:41:58 +CheckAHIPrefs.c
362 182 49.7% 02-Nov-97 23:46:18 +smakefile
389 159 59.1% 02-Nov-97 23:44:36 +Makefile
2382 1044 56.1% 01-May-96 20:13:30 +GetAudioID.info
840 474 43.5% 01-May-96 20:13:30 +empty.ct
376 232 38.2% 01-May-96 20:13:30 +GetAudioID.catalog
2276 1394 38.7% 01-May-96 20:13:30 +GetAudioID
8438 3543 58.0% 01-May-96 20:13:30 +GetAudioID.guide
1831 1130 38.2% 01-May-96 20:13:30 +GetAudioID.guide.info
1903 600 68.4% 01-May-96 20:13:30 +GetAudioID.info
841 463 44.9% 01-May-96 20:13:30 +GAI.cd
11973 4497 62.4% 01-May-96 20:13:30 +GAI.S
2960 1893 36.0% 04-Nov-97 22:50:00 +BestAudioID
2655 977 63.2% 02-Jul-97 10:24:02 +BestAudioID.c
150 116 22.6% 28-Jun-97 18:30:02 +SCOPTIONS
309 172 44.3% 02-Jul-97 10:30:44 +smakefile
3540 2200 37.8% 04-Nov-97 22:50:12 +DoubleBuffer
7604 2069 72.7% 03-Aug-97 18:36:36 +DoubleBuffer.c
153 121 20.9% 30-Sep-96 09:38:30 +SCOPTIONS
310 172 44.5% 02-Jul-97 10:30:04 +smakefile
830 511 38.4% 03-Jul-97 11:09:14 +HardDiskRecord.catalog
3397 951 72.0% 03-Jul-97 11:09:14 +HardDiskRecord.ct
13035 3406 73.8% 16-Sep-96 15:51:34 +GUI.c
16250 2348 85.5% 18-Jul-96 09:17:18 +GUI.des
292 91 68.8% 18-Jul-96 09:17:18 +GUI.extras.h
2546 737 71.0% 16-Sep-96 15:51:36 +GUI.h
12676 6911 45.4% 04-Nov-97 22:50:40 +HardDiskRecord
19955 5951 70.1% 23-Jan-97 18:59:54 +HardDiskRecord.c
2612 616 76.4% 16-Sep-96 15:51:34 +HardDiskRecord.cd
2896 659 77.2% 16-Sep-96 15:51:34 +HardDiskRecord.ct
1657 679 59.0% 18-Jul-96 09:17:18 +HardDiskRecord.h
374 246 34.2% 22-Apr-97 00:04:08 +HardDiskRecord.readme
3307 1191 63.9% 18-Jul-96 09:17:18 +recordfunc.a
1081 487 54.9% 03-Jul-97 12:01:12 +smakefile
620 391 36.9% 04-Nov-97 22:50:52 +ahi.lib
1226 580 52.6% 02-Apr-97 21:48:46 +AHI_lib.c
219 124 43.3% 03-Jul-97 12:07:12 +smakefile
473 218 53.9% 05-Jul-97 16:55:26 +Makefile
2318 761 67.1% 17-Apr-97 01:56:22 +PT-AHIPlay.h
1901 708 62.7% 17-Apr-97 01:56:26 +PT-AHIPlay.i
4508 2571 42.9% 04-Nov-97 22:50:58 +PT-AHIPlay.o
29995 7592 74.6% 11-Jul-97 11:17:14 +PT-AHIPlay.s
29117 7798 73.2% 17-Apr-97 01:26:54 +PT-AHIPlay_old.s
113 98 13.2% 02-Jul-97 10:35:46 +smakefile
7070 2045 71.0% 29-Apr-97 00:07:16 +Class.c
3038 1044 65.6% 18-Apr-97 17:38:54 +Data.h
485 268 44.7% 28-Oct-96 21:54:00 +DT_code.a
299 158 47.1% 29-Apr-97 13:03:44 +DT_ident
7179 2160 69.9% 18-Apr-97 17:39:16 +LibCode.c
263 152 42.2% 29-Apr-97 00:04:48 +protracker.datatype_rev.h
312 177 43.2% 29-Apr-97 00:04:48 +protracker.datatype_rev.i
15 15 0.0% 29-Apr-97 00:04:48 +protracker.datatype_rev.rev
281 168 40.2% 07-Oct-96 19:17:14 +protracker_rev.i
14 14 0.0% 07-Oct-96 19:17:14 +protracker_rev.rev
628 278 55.7% 29-Apr-97 13:08:12 +ProtrackerDT.info
7008 4034 42.4% 04-Nov-97 22:51:18 +protracker.datatype
248 196 20.9% 04-Nov-97 22:51:24 +Protracker
473 294 37.8% 13-Oct-96 09:16:24 +Protracker.info
3 3 0.0% 02-Jul-97 11:05:08 +Protracker
643 287 55.3% 29-Apr-97 13:04:08 +Install
726 361 50.2% 29-Apr-97 13:07:38 +Install.info
1189 650 45.3% 29-Apr-97 13:09:38 +ProtrackerDT.readme
468 231 50.6% 29-Apr-97 13:07:38 +ProtrackerDT.readme.info
1338 529 60.4% 18-Apr-97 12:31:26 +RomTag.a
1246 628 49.5% 03-Jul-97 11:47:36 +SMakefile
2635 1234 53.1% 17-Nov-96 16:05:12 +RecordTestQnD.s
2280 1544 32.2% 04-Nov-97 22:51:38 +Req-test
1915 855 55.3% 28-Jun-97 18:27:28 +req-test.c
150 116 22.6% 02-Apr-97 21:59:08 +SCOPTIONS
306 168 45.0% 02-Jul-97 10:29:32 +smakefile
153 121 20.9% 26-Jan-97 22:52:12 +SCOPTIONS
3760 2438 35.1% 04-Nov-97 22:51:52 +SimplePlay
10853 2926 73.0% 23-Apr-97 20:09:34 +SimplePlay.c
308 172 44.1% 02-Jul-97 10:31:12 +smakefile
371 149 59.8% 02-Nov-97 23:44:18 +Makefile
4914 993 79.7% 04-Nov-97 22:59:38 +ahi.h
3115 696 77.6% 04-Nov-97 22:59:38 +ahi_sub.h
53 53 0.0% 15-Nov-96 00:23:00 +ahi_pragmas.h
61 61 0.0% 15-Nov-96 00:23:12 +ahi_sub_pragmas.h
188 135 28.1% 11-Jan-97 20:26:18 +ahi.h
205 144 29.7% 11-Jan-97 20:26:28 +ahi_sub.h
14170 4552 67.8% 27-Apr-97 14:08:44 +ahi.i
2661 1103 58.5% 02-Apr-97 22:03:52 +ahi_sub.i
850 287 66.2% 04-Nov-97 22:59:32 +ahi_lib.i
628 226 64.0% 04-Nov-97 22:59:32 +ahi_sub_lib.i
2011 632 68.5% 02-Apr-97 22:06:16 +ahi_protos.h
1424 503 64.6% 02-Apr-97 22:06:06 +ahi_sub_protos.h
14198 4172 70.6% 27-Apr-97 14:08:34 +ahi.h
3495 1249 64.2% 18-May-97 16:10:54 +ahi_sub.h
396 213 46.2% 04-Nov-97 22:59:40 +ahi.m
300 159 47.0% 04-Nov-97 22:59:40 +ahi_sub.m
4702 1933 58.8% 04-Nov-97 22:59:44 +ahi.m
822 425 48.2% 04-Nov-97 22:59:48 +ahi_sub.m
991 432 56.4% 02-Apr-97 22:06:42 +ahi_lib.fd
796 313 60.6% 26-Mar-97 23:25:16 +ahi_sub_lib.fd
1820 535 70.6% 04-Nov-97 22:59:34 +ahi_pragmas.h
1073 331 69.1% 04-Nov-97 22:59:36 +ahi_sub_pragmas.h
191 129 32.4% 04-Nov-97 22:59:36 +ahi.h
214 138 35.5% 04-Nov-97 22:59:36 +ahi_sub.h
1809 521 71.1% 04-Nov-97 22:59:32 +ahi_lib.h
1107 344 68.9% 04-Nov-97 22:59:34 +ahi_sub_lib.h
186 127 31.7% 04-Nov-97 22:59:34 +ahi.h
209 139 33.4% 04-Nov-97 22:59:34 +ahi_sub.h
50 48 4.0% 03-Mar-96 17:41:04 +ReadMe.txt
4696 2857 39.1% 08-Jul-97 00:25:36 +ScanAudioModes
8456 4950 41.4% 31-Dec-95 17:15:38 +sift
5765 1912 66.8% 21-May-96 19:19:16 +ScanAudioModes.c
85 69 18.8% 08-Jul-97 00:25:26 +SCOPTIONS
265 172 35.0% 21-May-96 19:19:30 +smakefile
5612 2503 55.3% 31-Dec-95 17:15:38 +sift.c
20821 7436 64.2% 03-Nov-97 00:13:28 +History
468 231 50.6% 08-Aug-97 17:39:30 +History.info
76850 20590 73.2% 02-Nov-97 00:01:38 +Install AHI
709 354 50.0% 08-Aug-97 17:39:30 +Install AHI.info
-------- ------- ----- --------- --------
1108967 335500 69.7% 11-Nov-97 22:23:28 166 files