[Bug 71753] New: Radeon Audio clock running wrong speed - bugzilla-daemon

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 71753] New: Radeon Audio clock running wrong speed
Date: Mon, 18 Nov 2013 18:51:50 +0000	[thread overview]
Message-ID: <bug-71753-502@http.bugs.freedesktop.org/> (raw)

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https://bugs.freedesktop.org/show_bug.cgi?id=71753

          Priority: medium
            Bug ID: 71753
          Assignee: dri-devel@lists.freedesktop.org
           Summary: Radeon Audio clock running wrong speed
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: fritsch@xbmc.org
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

When syncing radeon audio to a systemclock one realizes that it goes wrong
approximately 10ms per 6 seconds.

For example with 60hz and 50hz the audio clock is 10ms / 6 seconds too fast,
which causes great issues, when watching e.g. LiveTV.

When displaying at 24hz the audio clock is approximately 10ms / 6 seconds too
slow, which can be workarounded by doubling packages.

You can only realize this problem, if you don't use any resample algorithms to
make audio fit.

Some output from an xbmc.log:

Configuration: 50hz no sync playback to display.
Kernel 3.12 (Pierre Ossmann patch applied) with mesa git

19:46:13 T:139718574470912   DEBUG: CDVDPlayerAudio:: Discontinuity2 -
was:62710358734.243919, should be:62710332298.764549, error:-26435.479370
19:46:16 T:139718574470912   DEBUG: CDVDPlayerAudio:: Discontinuity2 -
was:62712528103.582550, should be:62712508710.849106, error:-19392.733447
19:46:17 T:139718566078208   DEBUG: CPullupCorrection: detected pattern of
length 1: 40000.00, frameduration: 40000.000000
19:46:22 T:139718574470912   DEBUG: CDVDPlayerAudio:: Discontinuity2 -
was:62718996472.639107, should be:62719007584.295349, error:11111.656243
19:46:28 T:139718574470912   DEBUG: CDVDPlayerAudio:: Discontinuity2 -
was:62725295876.976349, should be:62725306470.191048, error:10593.214698
19:46:35 T:139718574470912   DEBUG: CDVDPlayerAudio:: Discontinuity2 -
was:62731698477.715050, should be:62731709235.032417, error:10757.317365
19:46:38 T:139719056176896   DEBUG: Thread JobWorker 139719056176896
terminating (autodelete)
19:46:41 T:139718574470912   DEBUG: CDVDPlayerAudio:: Discontinuity2 -
was:62738297284.064415, should be:62738308465.384331, error:11181.319916
19:46:48 T:139718574470912   DEBUG: CDVDPlayerAudio:: Discontinuity2 -
was:62744796455.484329, should be:62744807397.750954, error:10942.266624

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