Provided by: oss4-base_4.2-build2004-1ubuntu2_i386
oss_madi - RME HDSP MADI and AES32 audio driver
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
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.
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
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
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.
o 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.
o Use of mmap() is and will not be supported.
o Virtual mixer is not supported (yet).
/etc/oss4/conf/oss_madi.conf Device configuration file.
27 September 2011 oss_madi(7)