[pulseaudio-tickets] [Bug 80770] New: module-loopback ignores latency_msec option

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80770

          Priority: medium
            Bug ID: 80770
                CC: lennart at poettering.net
          Assignee: pulseaudio-bugs at lists.freedesktop.org
           Summary: module-loopback ignores latency_msec option
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: ifyoudieinthegameyoudieforreal at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: modules
           Product: PulseAudio

My latency using module-loopback is unacceptable for playing video games
through it (video game hardware connected to analog input). After I couldn't
get any better using the module's latency_msec option, I dinked around all that
I could with possible priority problems, realtime problems... Now, though, I
see that my latency is exactly the same whether I set latency_msec=1 or
latency_msec=2000, and 'pactl list sink-inputs' reflects that:

[david at delphinium pulse]$ pactl load-module module-loopback latency_msec=1   
38
[david at delphinium pulse]$ pactl list sink-inputs
Sink Input #10
    Driver: module-loopback.c
    Owner Module: 38
    Client: n/a
    Sink: 0
    Sample Specification: s16le 2ch 44011Hz
    Channel Map: front-left,front-right
    Format: pcm
    Corked: no
    Mute: no
    Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% /
0.00 dB
            balance 0.00
    Buffer Latency: 200767 usec
    Sink Latency: 99891 usec
    Resample method: speex-float-1
    Properties:
        media.role = "abstract"
        module-stream-restore.id = "sink-input-by-media-role:abstract"
        media.name = "Loopback from CMI8788 [Oxygen HD Audio] (Virtuoso 100
(Xonar DX)) Analog Stereo"
[david at delphinium pulse]$ pactl unload-module module-loopback
[david at delphinium pulse]$ pactl load-module module-loopback latency_msec=2000
39
[david at delphinium pulse]$ pactl list sink-inputs
Sink Input #11
    Driver: module-loopback.c
    Owner Module: 39
    Client: n/a
    Sink: 0
    Sample Specification: s16le 2ch 44011Hz
    Channel Map: front-left,front-right
    Format: pcm
    Corked: no
    Mute: no
    Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% /
0.00 dB
            balance 0.00
    Buffer Latency: 197905 usec
    Sink Latency: 99844 usec
    Resample method: speex-float-1
    Properties:
        media.role = "abstract"
        module-stream-restore.id = "sink-input-by-media-role:abstract"
        media.name = "Loopback from CMI8788 [Oxygen HD Audio] (Virtuoso 100
(Xonar DX)) Analog Stereo"

No matter what I set latency_msec to, 'Buffer Latency' is ~200ms, which is
latency_msec's default value. It appears that this option is being ignored,
which is a huge pain, obviously.

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