Provided by: oss4-base_4.2-build2005-2ubuntu1_i386 bug


       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
       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 (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


       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

       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.


       4Front Technologies

                               05 February 2012                    oss_madi(7)