/etc/apparmor.d/abstractions/audio is in apparmor 2.7.102-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | # vim:syntax=apparmor
# ------------------------------------------------------------------
#
#    Copyright (C) 2002-2009 Novell/SUSE
#    Copyright (C) 2009 Canonical Ltd.
#
#    This program is free software; you can redistribute it and/or
#    modify it under the terms of version 2 of the GNU General Public
#    License published by the Free Software Foundation.
#
# ------------------------------------------------------------------
/dev/admmidi*   rw,
/dev/adsp*      rw,
/dev/aload*     rw,
/dev/amidi*     rw,
/dev/audio*     rw,
/dev/dmfm*      rw,
/dev/dmmidi*    rw,
/dev/dsp*       rw,
/dev/midi*      rw,
/dev/mixer*     rw,
/dev/mpu401data rw,
/dev/mpu401stat rw,
/dev/patmgr*    rw,
/dev/phone*     rw,
/dev/radio*     rw,
/dev/rmidi*     rw,
/dev/sequencer  rw,
/dev/sequencer2 rw,
/dev/smpte*     rw,
/dev/snd/*      rw,
/dev/sound/*    rw,
@{PROC}/asound/** rw,
/usr/share/alsa/** r,
/usr/share/sounds/** r,
@{HOME}/.esd_auth  r,
@{HOME}/.asoundrc  r,
/etc/esound/esd.conf r,
# libcanberra
@{HOME}/.cache/event-sound-cache.* rwk,
# pulse
/etc/pulse/ r,
/etc/pulse/* r,
/{run,dev}/shm/ r,
owner /{run,dev}/shm/pulse-shm* rwk,
owner @{HOME}/.pulse-cookie rwk,
owner @{HOME}/.pulse/ rw,
owner @{HOME}/.pulse/* rwk,
owner /tmp/pulse-*/ rw,
owner /tmp/pulse-*/* rw,
# libgnome2
/etc/sound/ r,
/etc/sound/** r,
# openal
/etc/openal/alsoft.conf r,
owner @{HOME}/.alsoftrc r,
 |