[Bug 89729] New: Volume-change problems

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89729

            Bug ID: 89729
           Summary: Volume-change problems
           Product: Spice
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: server
          Assignee: spice-bugs at lists.freedesktop.org
          Reporter: me at victortoso.com

Creating this bug to track volume-change issues between guest and client. I
believe that big part of these issues are in QEMU that calls spice-server with
the wrong volume value (proportionally) but the solution could be done in the
using vdagent to check/sync audio properly;

This is also related to https://bugzilla.redhat.com/show_bug.cgi?id=1012868 as
we are trying to sync volume between client and guest using the agent but the
server sends volume-change with different value of the one just set by the
agent and usually higher then the right value.

Main issues when setting guest volume;

1) F21(client) and F21(guest) - The value sent by spice-server is always higher
then the updated value in the guest;

2) F21(client) and Windows 7(guest) - Same as 1)

3) Windows 7(client) to Windows XP(guest): Setting 100% in the guest is 74% in
the client;

Example:
client: Fedora 21 (all spice components from git master)
guest: Fedora 21 (latests from f21)
volume in both before: 32768 or -18.06 dB (50%)
setting volume with `pacmd set-sink-volume 0 volume`
setting 10000 (around 15%), spice-gtk receives 22102 (33%)
setting 40000 (around 61%), spice-gtk receives 53970 (82%)
setting 50000 (around 76%), spice-gtk receives 59110 (90%)
setting 60000 (around 91%), spice-gtk receives 63736 (97%)
setting 65000 hits the maximum in the client (65536)

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