Configuring Sound on Linux/Pulse Audio/Testing
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To test a PulseAudio installation use pacat which is equivalent to ALSA's aplay utility. Warning: the output from this command may be _very_ loud.
pacat < /dev/urandom
Using pacmd
[edit | edit source]Firstly run pacmd.
~$ pacmd
Welcome to PulseAudio! Use "help" for usage information.
Next run the command list-sinks.
>>> list-sinks
1 sink(s) available.
* index: 0
name: <alsa_output.pci_8086_27d8_sound_card_0_alsa_playback_0>
driver: <modules/module-alsa-sink.c>
flags: HW_VOLUME_CTRL LATENCY HARDWARE
state: RUNNING
volume: <0: 63% 1: 63%>
mute: <0>
latency: <78911 usec>
monitor source: <1>
sample spec: <s16le 2ch 44100Hz>
channel map: <front-left,front-right>
used by: <1>
linked by: <1>
module: <1>
description: <ALSA PCM on front:0 (AD198x Analog) via DMA>
Now you know the name of your sink and your index. In this example the name is alsa_output.pci_8086_27d8_sound_card_0_alsa_playback_0, and the index is 0. Now you will want a list of samples, use list-samples to accomplish this.
>>> list-samples
3 cache entries available.
name: <pulse-hotplug>
index: <0>
sample spec: <n/a>
channel map: <n/a>
length: <0>
duration: <0.0s>
volume: <0: 100% 1: 100%>
lazy: yes
filename: /usr/share/sounds/startup3.wav
name: <esound.gnome-2/logout>
index: <1>
sample spec: <s16le 2ch 44100Hz>
channel map: <front-left,front-right>
length: <317500>
duration: <1.8s>
volume: <0: 100% 1: 100%>
lazy: no
filename: n/a
name: <esound.gnome-2/login>
index: <2>
sample spec: <s16le 2ch 44100Hz>
channel map: <front-left,front-right>
length: <1361924>
duration: <7.7s>
volume: <0: 100% 1: 100%>
lazy: no
filename: n/a
Now you can use the command play-sample followed by the name of the sample, and the index or the sink-name to test your PulseAudio configuration.
>>> play-sample pulse-hotplug 0
-or-
>>> play-sample pulse-hotplug alsa_output.pci_8086_27d8_sound_card_0_alsa_playback_0
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