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