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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Radeon Audio clock running wrong speed"
href="https://bugs.freedesktop.org/show_bug.cgi?id=71753">71753</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>Radeon Audio clock running wrong speed
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>fritsch@xbmc.org
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg CVS
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Radeon
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
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<pre>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</pre>
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