Bug 71753

Summary: Radeon Audio clock running wrong speed
Product: DRI Reporter: Peter Frühberger <fritsch>
Component: DRM/RadeonAssignee: Default DRI bug account <dri-devel>
Status: RESOLVED MOVED QA Contact:
Severity: normal    
Priority: medium    
Version: XOrg git   
Hardware: Other   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
xrandr output
none
dmesg output
none
glxinfo none

Description Peter Frühberger 2013-11-18 18:51:50 UTC 
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
Comment 1 Peter Frühberger 2013-11-18 18:58:08 UTC 
Created attachment 89423 [details]
xrandr output
Comment 2 Peter Frühberger 2013-11-18 18:59:04 UTC 
Created attachment 89424 [details]
dmesg output
Comment 3 Peter Frühberger 2013-11-18 18:59:36 UTC 
Created attachment 89425 [details]
glxinfo
Comment 4 Rainer Hochecker 2014-03-19 07:18:30 UTC 
Display also runs wrong speed. For a 23.976 mode we measure a average refresh rate of 23.95
Comment 5 Martin Peres 2019-11-19 08:40:04 UTC 
-- GitLab Migration Automatic Message --

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