All the relevant code lives in
/usr/src/sys/dev/sound/, except for the
public ioctl interface definitions, found in
/usr/src/sys/sys/soundcard.h
Under /usr/src/sys/dev/sound/, the
pcm/ directory holds the central code,
while the pci/, isa/
and usb/ directories have the drivers
for PCI and ISA boards, and for USB audio devices.
All FreeBSD documents are available for download at http://ftp.FreeBSD.org/pub/FreeBSD/doc/
Questions that are not answered by the
documentation may be
sent to <[email protected]>.
Send questions about this document to <[email protected]>.