229 lines
No EOL
7.4 KiB
Markdown
229 lines
No EOL
7.4 KiB
Markdown
# PulseAudio Configuration for seeed-voicecard
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Following this guide if you want to use your seeed-voicecard as a default source/sink of pulseaudio.
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### ReSpeaker 4 Mic Array
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1. Download pulseaudio
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```
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sudo apt install pulseaudio
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```
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2. First, you need to write [a profile for pulse](https://www.freedesktop.org/wiki/Software/PulseAudio/Backends/ALSA/Profiles/)
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```
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cd seeed-voicecard
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cd pulseaudio
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cd pulse_config_4mic
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sudo cp seeed-voicecard.conf /usr/share/pulseaudio/alsa-mixer/profile-sets/
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```
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3. Edit `udev rules`
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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`.
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```
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# have a look at /lib/udev/rules.d/90-pulseaudio.rules
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sudo vim /lib/udev/rules.d/90-pulseaudio.rules
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# add the following lines at about line 87(behind the setting for some laptops and before the line GOTO="pulseaudio_end")
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# Seeed Voicecard
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ATTR{id}=="seeed4micvoicec",ATTR{number}=="1",ENV{PULSE_PROFILE_SET}="seeed-voicecard.conf"
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```
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The value of `ATTR{number}` can be found with:
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```
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udevadm info -a -p /sys/class/sound/card0/
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# or udevadm info -a -p /sys/class/sound/card1/
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```
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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/`:
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```
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pi@raspberrypi:~ $ udevadm info -a -p /sys/class/sound/card1/
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Udevadm info starts with the device specified by the devpath and then
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walks up the chain of parent devices. It prints for every device
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found, all possible attributes in the udev rules key format.
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A rule to match, can be composed by the attributes of the device
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and the attributes from one single parent device.
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looking at device '/devices/platform/soc/soc:sound/sound/card1':
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KERNEL=="card1"
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SUBSYSTEM=="sound"
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DRIVER==""
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ATTR{id}=="seeed4micvoicec"
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ATTR{number}=="1"
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looking at parent device '/devices/platform/soc/soc:sound':
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KERNELS=="soc:sound"
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SUBSYSTEMS=="platform"
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DRIVERS=="seeed-voicecard"
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ATTRS{driver_override}=="(null)"
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looking at parent device '/devices/platform/soc':
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KERNELS=="soc"
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SUBSYSTEMS=="platform"
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DRIVERS==""
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ATTRS{driver_override}=="(null)"
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looking at parent device '/devices/platform':
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KERNELS=="platform"
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SUBSYSTEMS==""
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DRIVERS==""
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```
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4. config `default.pa` and `daemon.conf`
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```
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sudo cp default.pa /etc/pulse/
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sudo cp daemon.conf /etc/pulse/
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```
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5. reboot raspberry pi and check
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```
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sudo reboot
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pulseaudio --start # start pulse at first
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pactl info # check the setting
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Server String: /run/user/1000/pulse/native
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Library Protocol Version: 32
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Server Protocol Version: 32
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Is Local: yes
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Client Index: 18
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Tile Size: 65496
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User Name: pi
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Host Name: raspberrypi
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Server Name: pulseaudio
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Server Version: 10.0
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Default Sample Specification: s16le 4ch 96000Hz
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Default Channel Map: front-left,front-center,front-right,rear-center
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Default Sink: alsa_output.platform-soc_audio.analog-stereo
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Default Source: alsa_input.platform-soc_sound.seeed-source
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Cookie: 3b12:70b3
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```
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### 6-Mics Circular Array Kit and 4-Mics Linear Array
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1. Download pulseaudio
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```
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sudo apt install pulseaudio
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```
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2. First, you need to write [a profile for pulse](https://www.freedesktop.org/wiki/Software/PulseAudio/Backends/ALSA/Profiles/)
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```
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cd seeed-voicecard
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cd pulseaudio
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cd pulse_config_6mic
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sudo cp seeed-voicecard.conf /usr/share/pulseaudio/alsa-mixer/profile-sets/
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```
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3. Edit `udev rules`
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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`.
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```
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# have a look at /lib/udev/rules.d/90-pulseaudio.rules
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sudo vim /lib/udev/rules.d/90-pulseaudio.rules
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# add the following lines at about line 87(behind the setting for some laptops and before the line GOTO="pulseaudio_end")
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# Seeed Voicecard
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ATTR{id}=="seeed8micvoicec",ATTR{number}=="1",ENV{PULSE_PROFILE_SET}="seeed-voicecard.conf"
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```
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The value of `ATTR{number}` can be found with:
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```
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udevadm info -a -p /sys/class/sound/card0/
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# or udevadm info -a -p /sys/class/sound/card1/
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```
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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/`:
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```
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pi@raspberrypi:~ $ udevadm info -a -p /sys/class/sound/card1/
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Udevadm info starts with the device specified by the devpath and then
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walks up the chain of parent devices. It prints for every device
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found, all possible attributes in the udev rules key format.
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A rule to match, can be composed by the attributes of the device
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and the attributes from one single parent device.
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looking at device '/devices/platform/soc/soc:sound/sound/card1':
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KERNEL=="card1"
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SUBSYSTEM=="sound"
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DRIVER==""
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ATTR{id}=="seeed8micvoicec"
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ATTR{number}=="1"
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looking at parent device '/devices/platform/soc/soc:sound':
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KERNELS=="soc:sound"
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SUBSYSTEMS=="platform"
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DRIVERS=="seeed-voicecard"
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ATTRS{driver_override}=="(null)"
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looking at parent device '/devices/platform/soc':
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KERNELS=="soc"
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SUBSYSTEMS=="platform"
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DRIVERS==""
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ATTRS{driver_override}=="(null)"
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looking at parent device '/devices/platform':
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KERNELS=="platform"
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SUBSYSTEMS==""
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DRIVERS==""
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```
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4. config `default.pa` and `daemon.conf`
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```
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sudo cp default.pa /etc/pulse/
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sudo cp daemon.conf /etc/pulse/
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```
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5. reboot raspberry pi and check
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```
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sudo reboot
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pulseaudio --start # start pulse at first
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pactl info # check the setting
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# The output should be like this
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# You could see the default sink is seeed-2ch and default source is seeed-8ch
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pi@raspberrypi:~ $ pactl info
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Server String: /run/user/1000/pulse/native
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Library Protocol Version: 32
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Server Protocol Version: 32
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Is Local: yes
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Client Index: 6
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Tile Size: 65496
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User Name: pi
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Host Name: raspberrypi
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Server Name: pulseaudio
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Server Version: 10.0
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Default Sample Specification: s32le 8ch 96000Hz
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Default Channel Map: front-left,front-left-of-center,front-center,front-right,front-right-of-center,rear-center,aux0,aux1
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Default Sink: alsa_output.platform-soc_sound.seeed-2ch
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Default Source: alsa_input.platform-soc_sound.seeed-8ch
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Cookie: 3523:e5af
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```
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### FAQ
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1. Default Sink/Source not right
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Make sure there is no any other daemon or using the audio device. Then check profile and udev rules.
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`pacmd list-sinks` and `pacmd list-sources` can be used to show the avaiable sinks/sources, after pulseaudio is started.
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2. Can't start PulseAudio
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Check `default.pa` and `daemon.conf`
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3. How to get PulseAudio started automatically
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Normally the PulseAudio server is started automatically. If you want to disable it, you can set `autospawn = no` in `~/.config/pulse/client.conf` or `/etc/pulse/client.conf`.
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[Click this for more details](https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Running/).
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4. Why the default sample rate is 96000? What if my audio's sample rate is not the same as the default?
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For the other sample rate audio, PulseAudio will resample it into 96K, which means that if your audio's sample rate is lower than 96K, it will get smoothing. |