FreeBSD Architecture Handbook
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# 15.2 Files

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.

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