- 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 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.
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
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.
- 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.
- 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).
/etc/oss4/conf/oss_madi.conf Device configuration file.