ENVY(4) BSD Kernel Interfaces Manual ENVY(4)
envy -- VIA Envy24 audio device
envy* at pci?
audio* at envy?
midi* at envy?
The envy driver supports sound cards based on VIA Envy24 and Envy24HT PCI
chips. The following sound cards are currently supported:
o Dynex DX-SC51
o ESI Julia
o M-Audio Delta 1010, 1010LT, 66 and 44
o M-Audio Audiophile 2496
o M-Audio Revolution 5.1
o M-Audio Audiophile 192k
o Terratec EWX 24/96
o VIA Tremor 5.1
The chip features a digital mixer that routes and mixes the streams below
inputs There are 8 streams corresponding to data received by the
device from the codecs. They are labelled line0 - line7 in the
outputs There are 8 streams corresponding to data sent by the device to
the codecs. They are labelled line0 - line7. Each of them can
be individually configured to use any of the external inputs or
its corresponding playback stream as source. Additionally,
outputs line0 and line1 can be configured to use mon0 or mon1
monitor There are 2 streams that can be configured to contain any lin-
ear superposition of any of the 10 playback and 10 external
input streams. They are labelled mon0 and mon1. From the
mixer's point of view they are input streams, so they can be
used as sources of output streams. This feature is specific to
Envy24 based cards.
playback There are 10 streams corresponding to samples transferred from
the host to the device. They are labelled play0 - play9. From
the mixer's point of view they are input streams, so they are
usable as sources of output streams.
record There are 12 streams corresponding to samples transferred from
the device to the host. They are not controllable by the
mixer. Streams 0 to 7 are hardwired to external inputs line0 -
line7 and streams 10 and 11 are hardwired to mon0 and mon1.
Playback and record data formats
Both playback and record use linear encoding. Samples are represented by
32-bit signed numbers in little endian order. Only the first 24 most
significant bits are used. On Envy24-based cards, playback uses 10 chan-
nels and record uses 12 channels, while on Envy24HT-based cards the num-
ber of streams depend on the number of codecs physically present on the
audio(4), intro(4), midi(4), pci(4)
The envy driver first appeared in OpenBSD 4.3.
S/PDIF transmitter/receiver is not supported.
Ring buffer sizes are limited to 64kB, which can be limiting at high sam-
BSD March 7, 2011 BSD