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MHI driver for mpeg.device

   Author:       Andreas Barth (based on verson 1.1 by Michael Henke)
   Uploader:     andreas_barth gmx net (Andreas Barth)
   Type:         mus/play
   Version:      1.5
   Architecture: m68k-amigaos >= 2.0.4
   Distribution: Aminet
   Date:         2023-03-04
   Readme:       http://aminet.net/mus/play/mhimdev.readme
   Downloads:    157

http://aminet.net/mus/play/mhimdev.lha

$VER: mhimdev.library 1.5 (Sat 04-Mar-2023)

#features

mhimdev.library is a driver for the MHI system. It doesn't support any

specific MPEG audio hardware decoder directly, instead it sends the data

to an mpeg.device driver. It's an "interface converter" or "wrapper" that

allows you to use your existing MPEG hardware and drivers in applications

which support the new MHI interface only. (such as AmigaAMP)

This program is free software, full source code available at:

https://bitbucket.org/supernobby/mhimdev

#requirements

-AmigaOS V37+

-MPEG audio hardware decoder with mpeg.device support

(eg. CD32 FMV, Delfina DSP, MAS Player, Melody and possibly some more)

-developed on A1200 - OS3.1/68030+882 at 40MHz/16MBFastRAM/Delfina1200DSP

-tested with delfinampeg.device 1.2 and AmigaAMP 2.9-beta1

-tested with AmigaAMP 2.24

#changes since previous release

- after pause resume did not work correctly

#reason for version 1.2

I used the mhi_mdev.library and noticed a problem with the MPEGCMD_PLAY.

The library uses DoIO to send it to the device, which I think is not

compatible with the Commodore standard, where the command instead will

be aborted later.

I asked Michael to change this. But he can't do this any more. As source

is available, I did it.

Now, the MPEGCMD_PLAY is issued with SendIO and later aborted. This should

not cause any problems with mpeg devices that already worked with the

mhi_mdev.library. But now also the devices that wait for the MPEGCMD_PLAY

to be aborted (if there are any), which is I think so according to the

Commodore documentation, will also work.

#how to use

1) install library

> makedir LIBS:MHI

> copy mhimdev.library LIBS:MHI/

2) configure library

two parameters must be set in the environment variable MHIMDEV

-name of your specific mpeg.device

-unit number (usually 0, but may be different for your hardware)

example from my system:

> setenv MHIMDEV delfinampeg.device 0

> copy ENV:MHIMDEV ENVARC:

3) configure application(s)

at the moment only AmigaAMP uses the new MHI interface.

-start AmigaAMP prefs program

-go to System page

-select engine: MHI-Driver

-select driver: LIBS:MHI/mhimdev.library

4) have fun. ;-)

#known problems

-MHI defines a few extensions that are NOT SUPPORTED by the mpeg.device

standard so they are simply ignored. Currently they are:

-tone control (bass/mid/treble)

-crossmixing control (stereo channel separation)

-mhimdev.library was written according to the mpeg.device specification so

it should work with all MPEG decoders which support this interface.

Due to lack of other hardware decoders I can test it only with my Delfina

using delfinampeg.device. I would like to know what other mpeg.devices are

used with this MHI driver. (please report successful usage, too)

#acknowledgements

-idea and source by Michael Henke

mhimdev.library uses ideas/code from:

-MHI developers package by Paul Qureshi and Thomas Wenzel

-Melody developers package by Thorsten Hansen

-CLib-SDI example.library by Dirk Stoecker, Andreas R. Kleinert and others

#author

version 1.2 up to current:

Andreas Barth (andreas_barth at gmx.net)

up to version 1.1:

mailto: smack42 at web.de or smack at smack.de

mhimdev.library - MHI driver for mpeg.device

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Contents of mus/play/mhimdev.lha

PERMISSION  UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP     NAME
---------- ----------- ------- ------- ------ ---------- ------------ ----------
[unknown]                  275     628  43.8% -lh5- 678c Apr  5  2020 mhimdev.info
[unknown]                  496     820  60.5% -lh5- 4856 Mar  4 10:17 mhimdev/CHANGES
[unknown]                 7000   18113  38.6% -lh5- 9ad4 Jan 23 16:12 mhimdev/COPYING
[unknown]                 1748    2608  67.0% -lh5- 1b51 Mar  4 10:12 mhimdev/mhimdev.library
[unknown]                 2121    4493  47.2% -lh5- 8e45 Mar  4 10:20 mhimdev/README
[unknown]                  205     464  44.2% -lh5- 1983 Apr  5  2020 mhimdev/README.info
---------- ----------- ------- ------- ------ ---------- ------------ ----------
 Total         6 files   11845   27126  43.7%            Mar  5 03:48