init pulse setting

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# PulseAudio Configuration for seeed-voicecard
Following this guide if you want to use your seeed-voicecard as a default source/sink of pulseaudio.
### ReSpeaker 4 Mic Array
1. Download pulseaudio
```
sudo apt install pulseaudio
pulseaudio --k
```
2. First, you need to write [a profile for pulse](https://www.freedesktop.org/wiki/Software/PulseAudio/Backends/ALSA/Profiles/)
```
cd seeed-voicecard
cd pulseaudio
cd pulse_config_4mic
sudo cp seeed-voicecard.conf /usr/share/pulseaudio/alsa-mixer/profile-sets/
```
3. Edit `udev rules`
During the system start, when the card "seeed4micvoicec" is detected, the PULSE_PROFILE_SET variable will be set in the udev database, and PulseAudio will be forced to use `seeed-voicecard.conf`.
```
# have a look at /lib/udev/rules.d/90-pulseaudio.rules
sudo vim /lib/udev/rules.d/90-pulseaudio.rules
# add the following lines at about line 87(behind the setting for some laptops and before the line GOTO="pulseaudio_end")
# Seeed Voicecard
ATTR{id}=="seeed4micvoicec",ATTR{number}=="1",ENV{PULSE_PROFILE_SET}="seeed-voicecard.conf"
```
![](./udev_rules_4mic.png)
The value of `ATTR{number}` can be found with:
```
udevadm info -a -p /sys/class/sound/card0/
# or udevadm info -a -p /sys/class/sound/card1/
```
For example, in Raspberry Pi, we can find `ATTR{id}=="seeed4micvoicec"` and `ATTR{number}=="1"` with command `udevadm info -a -p /sys/class/sound/card1/`:
```
pi@raspberrypi:~ $ udevadm info -a -p /sys/class/sound/card1/
Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.
looking at device '/devices/platform/soc/soc:sound/sound/card1':
KERNEL=="card1"
SUBSYSTEM=="sound"
DRIVER==""
ATTR{id}=="seeed4micvoicec"
ATTR{number}=="1"
looking at parent device '/devices/platform/soc/soc:sound':
KERNELS=="soc:sound"
SUBSYSTEMS=="platform"
DRIVERS=="seeed-voicecard"
ATTRS{driver_override}=="(null)"
looking at parent device '/devices/platform/soc':
KERNELS=="soc"
SUBSYSTEMS=="platform"
DRIVERS==""
ATTRS{driver_override}=="(null)"
looking at parent device '/devices/platform':
KERNELS=="platform"
SUBSYSTEMS==""
DRIVERS==""
```
4. config `default.pa` and `daemon.conf`
```
sudo cp default.pa /etc/pulse/
sudo cp daemon.conf /etc/pulse/
```
5. reboot raspberry pi and check
```
sudo reboot
pulseaudio --start # start pulse at first
pactl info # check the setting
Server String: /run/user/1000/pulse/native
Library Protocol Version: 32
Server Protocol Version: 32
Is Local: yes
Client Index: 18
Tile Size: 65496
User Name: pi
Host Name: raspberrypi
Server Name: pulseaudio
Server Version: 10.0
Default Sample Specification: s16le 4ch 16000Hz
Default Channel Map: front-left,front-center,front-right,rear-center
Default Sink: alsa_output.platform-soc_audio.analog-stereo
Default Source: alsa_input.platform-soc_sound.seeed-source
Cookie: 3b12:70b3
```
### 6-Mics Circular Array Kit and 4-Mics Linear Array
1. Download pulseaudio
```
sudo apt install pulseaudio
pulseaudio --k
```
2. First, you need to write [a profile for pulse](https://www.freedesktop.org/wiki/Software/PulseAudio/Backends/ALSA/Profiles/)
```
cd seeed-voicecard
cd pulseaudio
cd pulse_config_6mic
sudo cp seeed-voicecard.conf /usr/share/pulseaudio/alsa-mixer/profile-sets/
```
3. Edit `udev rules`
During the system start, when the card "seeed8micvoicec" is detected, the PULSE_PROFILE_SET variable will be set in the udev database, and PulseAudio will be forced to use `seeed-voicecard.conf`.
```
# have a look at /lib/udev/rules.d/90-pulseaudio.rules
sudo vim /lib/udev/rules.d/90-pulseaudio.rules
# add the following lines at about line 87(behind the setting for some laptops and before the line GOTO="pulseaudio_end")
# Seeed Voicecard
ATTR{id}=="seeed8micvoicec",ATTR{number}=="1",ENV{PULSE_PROFILE_SET}="seeed-voicecard.conf"
```
![](./udev_rules_6mic.png)
The value of `ATTR{number}` can be found with:
```
udevadm info -a -p /sys/class/sound/card0/
# or udevadm info -a -p /sys/class/sound/card1/
```
For example, in Raspberry Pi, we can find `ATTR{id}=="seeed8micvoicec"` and `ATTR{number}=="1"` with command `udevadm info -a -p /sys/class/sound/card1/`:
```
pi@raspberrypi:~ $ udevadm info -a -p /sys/class/sound/card1/
Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.
looking at device '/devices/platform/soc/soc:sound/sound/card1':
KERNEL=="card1"
SUBSYSTEM=="sound"
DRIVER==""
ATTR{id}=="seeed8micvoicec"
ATTR{number}=="1"
looking at parent device '/devices/platform/soc/soc:sound':
KERNELS=="soc:sound"
SUBSYSTEMS=="platform"
DRIVERS=="seeed-voicecard"
ATTRS{driver_override}=="(null)"
looking at parent device '/devices/platform/soc':
KERNELS=="soc"
SUBSYSTEMS=="platform"
DRIVERS==""
ATTRS{driver_override}=="(null)"
looking at parent device '/devices/platform':
KERNELS=="platform"
SUBSYSTEMS==""
DRIVERS==""
```
4. config `default.pa` and `daemon.conf`
```
sudo cp default.pa /etc/pulse/
sudo cp daemon.conf /etc/pulse/
```
5. reboot raspberry pi and check
```
sudo reboot
pulseaudio --start # start pulse at first
pactl info # check the setting
# The output should be like this
# You could see the default sink is seeed-2ch and default source is seeed-8ch
pi@raspberrypi:~ $ pactl info
Server String: /run/user/1000/pulse/native
Library Protocol Version: 32
Server Protocol Version: 32
Is Local: yes
Client Index: 6
Tile Size: 65496
User Name: pi
Host Name: raspberrypi
Server Name: pulseaudio
Server Version: 10.0
Default Sample Specification: s32le 8ch 48000Hz
Default Channel Map: front-left,front-left-of-center,front-center,front-right,front-right-of-center,rear-center,aux0,aux1
Default Sink: alsa_output.platform-soc_sound.seeed-2ch
Default Source: alsa_input.platform-soc_sound.seeed-8ch
Cookie: 3523:e5af
```
### FAQ
1. Default Sink/Source not right
Make sure there is no any other daemon or using the audio device. Then check profile and udev rules.
`pacmd list-sinks` and `pacmd list-sources` can be used to show the avaiable sinks/sources, after pulseaudio is started.
2. Can't start PulseAudio
Check `default.pa` and `daemon.conf`

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# This file is part of PulseAudio.
#
# PulseAudio is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PulseAudio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
## Configuration file for the PulseAudio daemon. See pulse-daemon.conf(5) for
## more information. Default values are commented out. Use either ; or # for
## commenting.
; daemonize = no
; fail = yes
; allow-module-loading = yes
; allow-exit = yes
; use-pid-file = yes
; system-instance = no
; local-server-type = user
; enable-shm = yes
; enable-memfd = yes
; shm-size-bytes = 0 # setting this 0 will use the system-default, usually 64 MiB
; lock-memory = no
; cpu-limit = no
; high-priority = yes
; nice-level = -11
; realtime-scheduling = yes
; realtime-priority = 5
; exit-idle-time = 20
; scache-idle-time = 20
; dl-search-path = (depends on architecture)
; load-default-script-file = yes
; default-script-file = /etc/pulse/default.pa
; log-target = auto
; log-level = notice
; log-meta = no
; log-time = no
; log-backtrace = 0
; resample-method = speex-float-1
; enable-remixing = yes
; enable-lfe-remixing = no
; lfe-crossover-freq = 0
; flat-volumes = yes
; rlimit-fsize = -1
; rlimit-data = -1
; rlimit-stack = -1
; rlimit-core = -1
; rlimit-as = -1
; rlimit-rss = -1
; rlimit-nproc = -1
; rlimit-nofile = 256
; rlimit-memlock = -1
; rlimit-locks = -1
; rlimit-sigpending = -1
; rlimit-msgqueue = -1
; rlimit-nice = 31
; rlimit-rtprio = 9
; rlimit-rttime = 200000
default-sample-format = s16le
default-sample-rate = 16000
; alternate-sample-rate = 48000
default-sample-channels = 4
; default-channel-map = front-left,front-right
; default-fragments = 4
; default-fragment-size-msec = 25
; enable-deferred-volume = yes
; deferred-volume-safety-margin-usec = 8000
; deferred-volume-extra-delay-usec = 0

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#!/usr/bin/pulseaudio -nF
#
# This file is part of PulseAudio.
#
# PulseAudio is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PulseAudio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
# This startup script is used only if PulseAudio is started per-user
# (i.e. not in system mode)
.fail
### Automatically restore the volume of streams and devices
load-module module-device-restore
load-module module-stream-restore
load-module module-card-restore
### Automatically augment property information from .desktop files
### stored in /usr/share/application
load-module module-augment-properties
### Should be after module-*-restore but before module-*-detect
load-module module-switch-on-port-available
### Load audio drivers statically
### (it's probably better to not load these drivers manually, but instead
### use module-udev-detect -- see below -- for doing this automatically)
#load-module module-alsa-sink device="hw:1,0" channels=8 rate=48000 format=s32le
#load-module module-alsa-source device="hw:1,0" channels=8 rate=48000 format=s32le
#load-module module-oss device="/dev/dsp" sink_name=output source_name=input
#load-module module-oss-mmap device="/dev/dsp" sink_name=output source_name=input
#load-module module-null-sink
#load-module module-pipe-sink
### Automatically load driver modules depending on the hardware available
.ifexists module-udev-detect.so
load-module module-udev-detect
#channels=8 rate=48000 format=s32le
.else
### Use the static hardware detection module (for systems that lack udev support)
load-module module-detect
.endif
### Automatically connect sink and source if JACK server is present
.ifexists module-jackdbus-detect.so
.nofail
load-module module-jackdbus-detect channels=2
.fail
.endif
### Automatically load driver modules for Bluetooth hardware
.ifexists module-bluetooth-policy.so
load-module module-bluetooth-policy
.endif
.ifexists module-bluetooth-discover.so
load-module module-bluetooth-discover
.endif
### Load several protocols
.ifexists module-esound-protocol-unix.so
load-module module-esound-protocol-unix
.endif
load-module module-native-protocol-unix
### Network access (may be configured with paprefs, so leave this commented
### here if you plan to use paprefs)
#load-module module-esound-protocol-tcp
#load-module module-native-protocol-tcp
#load-module module-zeroconf-publish
### Load the RTP receiver module (also configured via paprefs, see above)
#load-module module-rtp-recv
### Load the RTP sender module (also configured via paprefs, see above)
#load-module module-null-sink sink_name=rtp format=s16be channels=2 rate=44100 sink_properties="device.description='RTP Multicast Sink'"
#load-module module-rtp-send source=rtp.monitor
### Load additional modules from GConf settings. This can be configured with the paprefs tool.
### Please keep in mind that the modules configured by paprefs might conflict with manually
### loaded modules.
.ifexists module-gconf.so
.nofail
load-module module-gconf
.fail
.endif
### Automatically restore the default sink/source when changed by the user
### during runtime
### NOTE: This should be loaded as early as possible so that subsequent modules
### that look up the default sink/source get the right value
load-module module-default-device-restore
### Automatically move streams to the default sink if the sink they are
### connected to dies, similar for sources
load-module module-rescue-streams
### Make sure we always have a sink around, even if it is a null sink.
load-module module-always-sink
### Honour intended role device property
load-module module-intended-roles
### Automatically suspend sinks/sources that become idle for too long
load-module module-suspend-on-idle
### If autoexit on idle is enabled we want to make sure we only quit
### when no local session needs us anymore.
.ifexists module-console-kit.so
load-module module-console-kit
.endif
.ifexists module-systemd-login.so
load-module module-systemd-login
.endif
### Enable positioned event sounds
load-module module-position-event-sounds
### Cork music/video streams when a phone stream is active
load-module module-role-cork
### Modules to allow autoloading of filters (such as echo cancellation)
### on demand. module-filter-heuristics tries to determine what filters
### make sense, and module-filter-apply does the heavy-lifting of
### loading modules and rerouting streams.
load-module module-filter-heuristics
load-module module-filter-apply
### Make some devices default
#set-default-sink output
#set-default-source input
set-default-source alsa_input.platform-soc_sound.seeed-source

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# /usr/share/pulseaudio/alsa-mixer/profile-sets/seeed-voicecard.conf
[General]
auto-profiles = no
[Mapping seeed-source]
device-strings = ac108
channel-map = front-left,front-right,rear-left,rear-right
exact-channels = false
fallback = yes
paths-input = seeed-source
priority = 3
direction = input
[Mapping seeed-sink]
device-strings = playback
channel-map = front-left,front-right,rear-left,rear-right
exact-channels = false
fallback = yes
paths-output = seeed-sink
direction = output
priority = 2
[Profile output:seeed-sink+input:seeed-source]
output-mappings = seeed-sink
input-mappings = seeed-source
priority = 100
skip-probe = yes
[Profile output:seeed-sink]
output-mappings = seeed-sink
priority = 4
skip-probe = yes
[Profile input:seeed-source]
input-mappings = seeed-source
priority = 5
skip-probe = yes

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# This file is part of PulseAudio.
#
# PulseAudio is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PulseAudio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
## Configuration file for the PulseAudio daemon. See pulse-daemon.conf(5) for
## more information. Default values are commented out. Use either ; or # for
## commenting.
; daemonize = no
; fail = yes
; allow-module-loading = yes
; allow-exit = yes
; use-pid-file = yes
; system-instance = no
; local-server-type = user
; enable-shm = yes
; enable-memfd = yes
; shm-size-bytes = 0 # setting this 0 will use the system-default, usually 64 MiB
; lock-memory = no
; cpu-limit = no
; high-priority = yes
; nice-level = -11
; realtime-scheduling = yes
; realtime-priority = 5
; exit-idle-time = 20
; scache-idle-time = 20
; dl-search-path = (depends on architecture)
; load-default-script-file = yes
; default-script-file = /etc/pulse/default.pa
; log-target = auto
; log-level = notice
; log-meta = no
; log-time = no
; log-backtrace = 0
; resample-method = speex-float-1
; enable-remixing = yes
; enable-lfe-remixing = no
; lfe-crossover-freq = 0
; flat-volumes = yes
; rlimit-fsize = -1
; rlimit-data = -1
; rlimit-stack = -1
; rlimit-core = -1
; rlimit-as = -1
; rlimit-rss = -1
; rlimit-nproc = -1
; rlimit-nofile = 256
; rlimit-memlock = -1
; rlimit-locks = -1
; rlimit-sigpending = -1
; rlimit-msgqueue = -1
; rlimit-nice = 31
; rlimit-rtprio = 9
; rlimit-rttime = 200000
default-sample-format = s32le
default-sample-rate = 48000
; alternate-sample-rate = 48000
default-sample-channels = 8
; default-channel-map = front-left,front-right
; default-fragments = 4
; default-fragment-size-msec = 25
; enable-deferred-volume = yes
; deferred-volume-safety-margin-usec = 8000
; deferred-volume-extra-delay-usec = 0

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#!/usr/bin/pulseaudio -nF
#
# This file is part of PulseAudio.
#
# PulseAudio is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PulseAudio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
# This startup script is used only if PulseAudio is started per-user
# (i.e. not in system mode)
.fail
### Automatically restore the volume of streams and devices
load-module module-device-restore
load-module module-stream-restore
load-module module-card-restore
### Automatically augment property information from .desktop files
### stored in /usr/share/application
load-module module-augment-properties
### Should be after module-*-restore but before module-*-detect
load-module module-switch-on-port-available
### Load audio drivers statically
### (it's probably better to not load these drivers manually, but instead
### use module-udev-detect -- see below -- for doing this automatically)
#load-module module-alsa-sink device="hw:1,0" channels=8 rate=48000 format=s32le
#load-module module-alsa-source device="hw:1,0" channels=8 rate=48000 format=s32le
#load-module module-oss device="/dev/dsp" sink_name=output source_name=input
#load-module module-oss-mmap device="/dev/dsp" sink_name=output source_name=input
#load-module module-null-sink
#load-module module-pipe-sink
### Automatically load driver modules depending on the hardware available
.ifexists module-udev-detect.so
load-module module-udev-detect
#channels=8 rate=48000 format=s32le
.else
### Use the static hardware detection module (for systems that lack udev support)
load-module module-detect
.endif
### Automatically connect sink and source if JACK server is present
.ifexists module-jackdbus-detect.so
.nofail
load-module module-jackdbus-detect channels=2
.fail
.endif
### Automatically load driver modules for Bluetooth hardware
.ifexists module-bluetooth-policy.so
load-module module-bluetooth-policy
.endif
.ifexists module-bluetooth-discover.so
load-module module-bluetooth-discover
.endif
### Load several protocols
.ifexists module-esound-protocol-unix.so
load-module module-esound-protocol-unix
.endif
load-module module-native-protocol-unix
### Network access (may be configured with paprefs, so leave this commented
### here if you plan to use paprefs)
#load-module module-esound-protocol-tcp
#load-module module-native-protocol-tcp
#load-module module-zeroconf-publish
### Load the RTP receiver module (also configured via paprefs, see above)
#load-module module-rtp-recv
### Load the RTP sender module (also configured via paprefs, see above)
#load-module module-null-sink sink_name=rtp format=s16be channels=2 rate=44100 sink_properties="device.description='RTP Multicast Sink'"
#load-module module-rtp-send source=rtp.monitor
### Load additional modules from GConf settings. This can be configured with the paprefs tool.
### Please keep in mind that the modules configured by paprefs might conflict with manually
### loaded modules.
.ifexists module-gconf.so
.nofail
load-module module-gconf
.fail
.endif
### Automatically restore the default sink/source when changed by the user
### during runtime
### NOTE: This should be loaded as early as possible so that subsequent modules
### that look up the default sink/source get the right value
load-module module-default-device-restore
### Automatically move streams to the default sink if the sink they are
### connected to dies, similar for sources
load-module module-rescue-streams
### Make sure we always have a sink around, even if it is a null sink.
load-module module-always-sink
### Honour intended role device property
load-module module-intended-roles
### Automatically suspend sinks/sources that become idle for too long
load-module module-suspend-on-idle
### If autoexit on idle is enabled we want to make sure we only quit
### when no local session needs us anymore.
.ifexists module-console-kit.so
load-module module-console-kit
.endif
.ifexists module-systemd-login.so
load-module module-systemd-login
.endif
### Enable positioned event sounds
load-module module-position-event-sounds
### Cork music/video streams when a phone stream is active
load-module module-role-cork
### Modules to allow autoloading of filters (such as echo cancellation)
### on demand. module-filter-heuristics tries to determine what filters
### make sense, and module-filter-apply does the heavy-lifting of
### loading modules and rerouting streams.
load-module module-filter-heuristics
load-module module-filter-apply
### Make some devices default
#set-default-sink output
#set-default-source input
set-default-source alsa_input.platform-soc_sound.seeed-8ch
set-default-sink alsa_output.platform-soc_sound.seeed-2ch

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# /usr/share/pulseaudio/alsa-mixer/profile-sets/seeed-voiced.conf
[General]
auto-profiles = no
[Mapping seeed-8ch]
device-strings = hw:1,0
channel-map = front-left,front-right,rear-left,rear-right,front-center,lfe,side-left,side-right
exact-channels = false
fallback = yes
paths-input = seeed-8ch
priority = 3
direction = input
[Mapping seeed-2ch]
device-strings = hw:1,0
channel-map = front-left,front-right,rear-left,rear-right,front-center,lfe,side-left,side-right
exact-channels = false
exact-channels = false
fallback = yes
paths-output = seeed-2ch
direction = output
priority = 2
[Profile output:seeed-2ch+input:seeed-8ch]
output-mappings = seeed-2ch
input-mappings = seeed-8ch
priority = 100
skip-probe = yes
[Profile output:seeed-2ch]
output-mappings = seeed-2ch
priority = 4
skip-probe = yes
[Profile input:seeed-8ch]
input-mappings = seeed-8ch
priority = 5
skip-probe = yes

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