[pulseaudio-tickets] [Bug 98368] New: module-http-protocol-tcp: add send buffer size argument

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98368

            Bug ID: 98368
           Summary: module-http-protocol-tcp: add send buffer size
                    argument
           Product: PulseAudio
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: modules
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: ewtoombs at uwaterloo.ca
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

Streaming audio from streams provided by module-http-protocol-tcp is often
impossible over wifi for reasons having nothing to do with sustained connection
speed.

Over wired ethernet,

$ wget -O -
http://server:4714/listen/source/alsa_output.pci-0000_00_07.0.analog-stereo.monitor
>/dev/null

goes at around 180KiB/s, so that's the speed it needs to go at to sustain the
stream. When I do the same thing over wifi, I only get a speed of around
100KiB/s—not fast enough. I tested this same wifi connection using an HTTP
stream between the same two hosts and got a sustained speed well in excess of
1.5MiB/s, so the wifi is plenty fast enough.

It must be some kind of queueing problem on the pulseaudio server end—probably
send buffer overflows. For instance, I can stream reliably with the following
command run on the remote client:

$ ssh server wget -q -O -
http://localhost:4714/listen/source/alsa_output.pci-0000_00_07.0.analog-stereo.monitor
|aplay -f s16_be -c 2 -r 44100

I'd like the option of increasing the size of this sending buffer, so that I do
the same streaming without having to tunnel through ssh. I don't really care
how much of an audio delay this incurs, since synchronisation isn't an issue.
Even if it were, I'd be OK with adding a corresponding delay to the local audio
output to maintain synchronisation. Something like this:

$ pactl load-module module-http-protocol-tcp send-buffer-time=500ms

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