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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
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<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - module-loopback ignores latency_msec option"
href="https://bugs.freedesktop.org/show_bug.cgi?id=80770">80770</a>
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<th>CC</th>
<td>lennart@poettering.net
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</tr>
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<th>Assignee</th>
<td>pulseaudio-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>module-loopback ignores latency_msec option
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>pulseaudio-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>major
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Reporter</th>
<td>ifyoudieinthegameyoudieforreal@gmail.com
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Component</th>
<td>modules
</td>
</tr>
<tr>
<th>Product</th>
<td>PulseAudio
</td>
</tr></table>
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<pre>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@delphinium pulse]$ pactl load-module module-loopback latency_msec=1
38
[david@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@delphinium pulse]$ pactl unload-module module-loopback
[david@delphinium pulse]$ pactl load-module module-loopback latency_msec=2000
39
[david@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.</pre>
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