Provided by: oss4-base_4.2-build2010-5ubuntu1~16.04.2_amd64 
NAME
oss_madi - RME HDSP MADI and AES32 audio driver
DESCRIPTION
Open Sound System driver for RME HDSP MADI and AES32 audio interfaces.
This driver has been developed for RME HDSP MADI but it also supports HDSP AES32. The driver has been
tested under Linux and Solaris under x86 and Sparc.
The internal engine of the card supports 64 playback channels and 64 recording channels. Only the first
channels are connected to the actual input and output ports of the card.
The mixer section of the card has recording level settings for all inputs. There is also an output
mixer. Each output channel has mixer sliders for corresponding input channel and corresponding audio
playback channel.
There is a full 64x(64+64) mixing matrix supported by the hardware. For the time being this mixer matrix
cannot be accessed directly by the applications. However support for the SNDCTL_MIX_MATRIX_WRITE and
SNDCTL_MIX_MATRIX_READ ioctl calls can be added in the future.
DEVICE FILES
By default the driver will create input and output device files for each 32 stereo pairs. This can be
changed by editing the settings in oss_madi.conf (see below).
The application can set the devices to use 1, 2, 4, 8, 16, 32 or 64 channels. The device file being used
selects the first channel slot within the available channels. For example pcm0 and pcmin0 sill select
channel 0. Equally well pcm1 and pcmin1 will select channel slot 2 (assuming that madi_devsize option is
set to 2). The first device (pcm0 and pcmin0) can be set to use up to 64 channels. The last devices
(pcm31 and pcmin31) only support 1 or 2 channel mode. The other device files support channel
configurations where the last channel doesn't exceed the number of total channels (madi_maxchannels).
Also the driver will not let two device files to share any of the channels with some other open device
file.
This channel allocation mechanism gives maximum flexibility to the user. It is possible to use some
output channels by multi channel application while the others are available for other applications. This
works as long the channel allocations by different applications don't overlap.
OPTIONS
o madi_maxchannels
Number of channels supported by the driver. The default is 64 which is also the maximum. This
parameter can be set to a lower value if full 64 channels are not required. With less channels the
mixer/control panel interface will require less space on screen.
o madi_devsize
By default this parameter is set to 2 which means that a device file will be created for each
stereo channel pair. Possible values are 1, 2, 4, 8, 16, 32 or 64.
LIMITATIONS
• The current driver doesn't support all control panel features of the card. For example sampling rate
is fixed to 48 kHz. More features will be added on contract.
• Use of mmap() is and will not be supported.
• Virtual mixer is not supported (yet).
FILES
/etc/oss4/conf/oss_madi.conf Device configuration file.
AUTHOR
4Front Technologies
09 July 2018 oss_madi(7)