After digging into this a bit more, it appears that the latency on the null
sink is all over the place when pavucontrol is NOT running. For example, here
is a case when it is not running:
index: 2
name: <ip_mcast>
driver: <module-null-sink.c>
flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
state: IDLE
suspend cause:
priority: 1000
volume: mono: 65536 / 100% / 0.00 dB
balance 0.00
base volume: 65536 / 100% / 0.00 dB
volume steps: 65537
muted: no
current latency: 1147.05 ms
max request: 62 KiB
max rewind: 62 KiB
monitor source: 3
sample spec: s16le 1ch 16000Hz
channel map: mono
Mono
used by: 0
linked by: 0
configured latency: 2000.00 ms; range is 0.50 .. 2000.00 ms
module: 4
properties:
device.description = "ip_mcast"
device.class = "abstract"
device.icon_name = "audio-card”
When pavucontrol is running, I get much more reasonable latencies (20-30mS).
index: 2
name: <ip_mcast>
driver: <module-null-sink.c>
flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
state: IDLE
suspend cause:
priority: 1000
volume: mono: 65536 / 100% / 0.00 dB
balance 0.00
base volume: 65536 / 100% / 0.00 dB
volume steps: 65537
muted: no
current latency: 20.63 ms
max request: 1 KiB
max rewind: 1 KiB
monitor source: 3
sample spec: s16le 1ch 16000Hz
channel map: mono
Mono
used by: 0
linked by: 1
configured latency: 40.00 ms; range is 0.50 .. 2000.00 ms
module: 4
properties:
device.description = "ip_mcast"
device.class = “abstract"
The biggest thing I notices is obviously the max request size. pavucontrol
probably sets that to 1 KiB and restores it to 62 KiB when it exists. Is this
something that can be changed from a config file?
Thanks again,
Travis
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