Radeon Audio clock running wrong speed

Submitted by Peter Frühberger

Assigned to Default DRI bug account

Link to original bug (#71753)

Description

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