snd_emu10kx man page on FreeBSD

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SND_EMU10KX(4)		 BSD Kernel Interfaces Manual		SND_EMU10KX(4)

     snd_emu10kx — Creative SoundBlaster Live! and Audigy sound cards device

     To compile this driver into the kernel, place the following lines in your
     kernel configuration file:

	   device sound
	   device snd_emu10kx

     Alternatively, to load the driver as a module at boot time, place the
     following line in loader.conf(5):


     The snd_emu10kx bridge driver allows the generic audio driver sound(4) to
     attach to Creative sound cards based on the EMU10K1, CA0100, CA0101,
     CA0102 and CA0108 DSPs.

     The snd_emu10kx sound cards have a PCM part, which is accessible through
     one to five pcm(4) devices (see MULTICHANNEL PLAYBACK for details), and
     MPU401-compatible MIDI I/O controller, which is accessible through the
     midi device.  Wave table synthesizer support is not available.

     The snd_emu10kx driver supports the following sound cards:

     ·	 Creative Sound Blaster Live! (EMU10K1 Chipset).  Both PCM and MIDI
	 interfaces are available.
     ·	 Creative Sound Blaster Audigy (CA0100 and CA0101 Chipset).  PCM and
	 two MIDI interfaces available.
     ·	 Creative Sound Blaster Audigy 2 and Creative Sound Blaster Audigy 4
	 (CA0102 Chipset).  PCM support is limited to 48kHz/16 bit stereo
	 (192kHz/24 bit part of this chipset is not supported).
     ·	 Creative Sound Blaster Audigy 2 Value (CA0108 Chipset).  PCM support
	 is limited to 48kHz/16 bit stereo (192kHz/24 bit part of this chipset
	 is not supported).  There is no MIDI support for this card.

     The snd_emu10kx driver does not support the following sound cards
     (although they have names similar to some supported ones):

     ·	 Creative Sound Blaster Live! 24-Bit, identified by FreeBSD as
	 "emu10k1x Soundblaster Live! 5.1".
     ·	 Creative Sound Blaster Audigy LS / ES, identified by FreeBSD as
	 "CA0106-DAT Audigy LS".
     ·	 All other Creative sound cards with -DAT chipsets.
     ·	 All Creative X-Fi series sound cards.

     By default the snd_emu10kx driver is loaded with multichannel playback
     capabilities enabled.  If you do not set the
     hint.emu10kx.0.multichannel_disabled option in your loader.conf(5) con‐
     figuration file you will get up to five DSP devices, one for each sound
     card output.  You can use additional software (like audio/pulseaudio from
     The Ports Collection) to do sound stream demultiplexing.  Only “FRONT”
     output can play and record sound from external sources (like line or
     S/PDIF inputs).

     By default multichannel recording capabilities are not enabled when you
     load the snd_emu10kx driver.  If you enable the
     hint.emu10kx.0.multichannel_recording option in loader.conf(5) you will
     get one more DSP device that is rate-locked to 48kHz/16bit/mono.  This is
     actually 48kHz/16bit/32 channels on SB Live! cards and
     48kHz/16bit/64channels on Audigy cards, but the current implementation of
     the sound subsystem does not support such an amount of PCM channels.
     This device can not be opened for read, thus confusing many applications.

     Within a multichannel stream, the first half (0-15 or 0-31) is a copy of
     all DSP outputs, the second half (15-30 or 32-63) is a copy of some DSP
     inputs.  On Live! cards the last substream (31) is used as a sync stream
     and is always set to 0xc0de.  Audigy cards do not need such sync data,
     because a stream always starts with substream 0.

   SB Live! substream map (in byte offsets, each substream is 2 bytes LE)
     Offset	   Substream

     +0x00..+0x1E  PCM streams 0..15

     +0x20, +0x22  Empty

     +0x24..+0x2A  PCM inputs: front left, front right, rear left, rear right,
		   center, sub

     +0x2C..+0x3C  DSP inputs 0..8:

     +0x3E	   sync substream (0xc0de)

   Audigy substream map (in byte offsets, each substream is 2 bytes LE)
     Offset	   Substream

     +0x00..+0x3E  PCM streams 0..31

     +0x40..+0x5E  PCM inputs: front LR, rear LR, center, sub, ...

     +0x60..+0x7E  DSP inputs 0..16

     These are the controls available through the standard OSS programming
     interface.	 You can use mixer(8) to change them.

     On EMU10K1-based cards the OSS mixer directly controls the AC97 codec.
     On newer cards the OSS mixer controls some parameters of the AC97 codec
     and some DSP-based mixer controls.

     "vol" mixer control for the overall sound volume.

     "pcm" mixer control for the PCM playback volume.  It controls only front
     output volume in multichannel mode and all output volume in single chan‐
     nel mode.

     "rec" mixer control acts very differently on EMU10K1 and other cards.  On
     EMU10K1 cards it controls the AC97 codec recording level.	On non-EMU10K1
     cards it controls the amount of AC97 “stereo mix”
      entering the DSP.	 AC97 recording level and AC97 recording source are
     fixed on CA0100, CA0101, CA0102 and CA0108 cards.	The AC97 recording
     levels are always set to maximum and recording source is always “stereo

     "dig1" is a CD S/PDIF (on-card) volume control

     "dig2" is an AudigyDrive S/PDIF (Audigy series) or TOSLink (SB Live!
     series) volume control

     "dig3" is an on-card S/PDIF volume control

     "line2" is AudigyDrive "Line In 2" volume control

     "line3" is AudigyDrive "AUX In 2" volume control

     Other OSS mixer controls control the inputs of the AC97 codec.

     You can control some of EMU10Kx's operation and configuration parameters
     through dev.emu10kx.⟨X⟩ sysctls.  These sysctl(8) values are temporary
     and should not be relied upon.

     Loader tunables are used to set driver configuration.  Tunables can be
     set at the loader(8) prompt before booting the kernel or they can be
     stored in /boot/loader.conf.  These tunables cannot be changed from a
     machine sysctl(8) entry after boot, but you can change them using kenv(1)
     before loading the snd_emu10kx driver.

	     Disables loading a driver instance.

	     Disables multichannel playback support, when one card is repre‐
	     sented as several PCM devices.

	     Enables experimental multichannel recording support.

	     Set debug output level.

	     0	 No additional debug options enabled

	     1	 Enables all DSP outputs to be connected, even those that are
		 known to be unused on a particular card.

	     2	 Additional debug messages about in-driver events will be

	     2	 Additional debug messages will be printed when memory alloca‐
		 tion fails.

     /dev/emu10kx?  snd_emu10kx management interface


     The snd_emu10kx device driver first appeared in FreeBSD 7.0.

     The PCM part of the driver is based on the snd_emu10k1(4) SB Live! driver
     by Cameron Grant ⟨⟩.	 The MIDI interface is based on the
     snd_emu10k1(4) MIDI interface code by Mathew Kanner ⟨⟩.
     The snd_emu10kx device driver and this manual page were written by Yuriy

     The driver does not detect lost S/PDIF signals and produces noise when
     S/PDIF is not connected and S/PDIF volume is not zero.

     The PCM driver cannot detect the presence of Live!Drive or AudigyDrive
     breakout boxes and tries to use them (and list their connectors in the

     The MIDI driver cannot detect the presence of Live!Drive or AudigyDrive
     breakout boxes and tries to enable the IR receiver on them anyway.

BSD				 May 28, 2008				   BSD

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