101 lines
3.2 KiB
Plaintext
101 lines
3.2 KiB
Plaintext
Alsa driver for Digigram miXart8 and miXart8AES/EBU soundcards
|
|
Digigram <alsa@digigram.com>
|
|
|
|
|
|
GENERAL
|
|
=======
|
|
|
|
The miXart8 is a multichannel audio processing and mixing soundcard
|
|
that has 4 stereo audio inputs and 4 stereo audio outputs.
|
|
The miXart8AES/EBU is the same with a add-on card that offers further
|
|
4 digital stereo audio inputs and outputs.
|
|
Furthermore the add-on card offers external clock synchronisation
|
|
(AES/EBU, Word Clock, Time Code and Video Synchro)
|
|
|
|
The mainboard has a PowerPC that offers onboard mpeg encoding and
|
|
decoding, samplerate conversions and various effects.
|
|
|
|
The driver don't work properly at all until the certain firmwares
|
|
are loaded, i.e. no PCM nor mixer devices will appear.
|
|
Use the mixartloader that can be found in the alsa-tools package.
|
|
|
|
|
|
VERSION 0.1.0
|
|
=============
|
|
|
|
One miXart8 board will be represented as 4 alsa cards, each with 1
|
|
stereo analog capture 'pcm0c' and 1 stereo analog playback 'pcm0p' device.
|
|
With a miXart8AES/EBU there is in addition 1 stereo digital input
|
|
'pcm1c' and 1 stereo digital output 'pcm1p' per card.
|
|
|
|
Formats
|
|
-------
|
|
U8, S16_LE, S16_BE, S24_3LE, S24_3BE, FLOAT_LE, FLOAT_BE
|
|
Sample rates : 8000 - 48000 Hz continuously
|
|
|
|
Playback
|
|
--------
|
|
For instance the playback devices are configured to have max. 4
|
|
substreams performing hardware mixing. This could be changed to a
|
|
maximum of 24 substreams if wished.
|
|
Mono files will be played on the left and right channel. Each channel
|
|
can be muted for each stream to use 8 analog/digital outputs separately.
|
|
|
|
Capture
|
|
-------
|
|
There is one substream per capture device. For instance only stereo
|
|
formats are supported.
|
|
|
|
Mixer
|
|
-----
|
|
<Master> and <Master Capture> : analog volume control of playback and capture PCM.
|
|
<PCM 0-3> and <PCM Capture> : digital volume control of each analog substream.
|
|
<AES 0-3> and <AES Capture> : digital volume control of each AES/EBU substream.
|
|
<Monitoring> : Loopback from 'pcm0c' to 'pcm0p' with digital volume
|
|
and mute control.
|
|
|
|
Rem : for best audio quality try to keep a 0 attenuation on the PCM
|
|
and AES volume controls which is set by 219 in the range from 0 to 255
|
|
(about 86% with alsamixer)
|
|
|
|
|
|
NOT YET IMPLEMENTED
|
|
===================
|
|
|
|
- external clock support (AES/EBU, Word Clock, Time Code, Video Sync)
|
|
- MPEG audio formats
|
|
- mono record
|
|
- on-board effects and samplerate conversions
|
|
- linked streams
|
|
|
|
|
|
FIRMWARE
|
|
========
|
|
|
|
[As of 2.6.11, the firmware can be loaded automatically with hotplug
|
|
when CONFIG_FW_LOADER is set. The mixartloader is necessary only
|
|
for older versions or when you build the driver into kernel.]
|
|
|
|
For loading the firmware automatically after the module is loaded, use a
|
|
install command. For example, add the following entry to
|
|
/etc/modprobe.d/mixart.conf for miXart driver:
|
|
|
|
install snd-mixart /sbin/modprobe --first-time -i snd-mixart && \
|
|
/usr/bin/mixartloader
|
|
(for 2.2/2.4 kernels, add "post-install snd-mixart /usr/bin/vxloader" to
|
|
/etc/modules.conf, instead.)
|
|
|
|
The firmware binaries are installed on /usr/share/alsa/firmware
|
|
(or /usr/local/share/alsa/firmware, depending to the prefix option of
|
|
configure). There will be a miXart.conf file, which define the dsp image
|
|
files.
|
|
|
|
The firmware files are copyright by Digigram SA
|
|
|
|
|
|
COPYRIGHT
|
|
=========
|
|
|
|
Copyright (c) 2003 Digigram SA <alsa@digigram.com>
|
|
Distributable under GPL.
|