Waveform disappeas playaing on win XP + WDM-KS

[mixxxbot]

Reported by: daschuer
Date: 2014-12-22T07:05:15Z
Status: Fix Released
Importance: High
Launchpad Issue: lp1404803
Tags: waveform
Attachments: cast.mp4

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When a track is playing the waveform disappears and only the lead-In is shown, once it stops. the view is as expected.
This happens with Sound-API: WDM-KS
The problem is gone when playing with direct sound.

I think there is something wrong with the reported latencies.
Around line:

mixxx/src/sounddeviceportaudio.cpp

Line 770 in 8738354

VisualPlayPosition::setTimeInfo(timeInfo);

Can someone on a windows environment check that?

[mixxxbot]

Commented by: esbrandt
Date: 2014-12-22T13:57:40Z

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Can confirm with OSX 10.9.
But i think the reason is within your pitch scale patch #415
The issue is only with the patch applied, if the patch gets reversed, everything back to normal.

[mixxxbot]

Commented by: daschuer
Date: 2014-12-22T14:39:51Z

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I can reproduce it reliable with a plain mixxx-master-git5001-x86.exe from build server.
So in my case, it can't be related with pitch scale patch.
WDM-KS -> lead in with triangles
Direct sound -> waveforms
Stop = waveform in both cases.

@jus: Has you issue the same symptoms? Do you have to do something special to get in this state?

[mixxxbot]

Commented by: esbrandt
Date: 2014-12-22T15:07:26Z

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It was like this:
OSX Core-Audio-> lead in with triangles
Stop = waveform

Doo.
I just rebuild with your patch applied and could NOT reproduce it.
So my assumption about the patch was not correct. Switched waveforms and skins to no avail, still works as expected. Will keep an eye on it.

[mixxxbot]

Commented by: esbrandt
Date: 2014-12-22T21:04:08Z
Attachments: cast.mp4

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Just happened again, did not found a definitive pattern yet, see short screen recording.
For once i was able to toggle waveform/preroll display by (de)selecting a microphone input in the sound hardware preferences. Did not catch that on video though.

[mixxxbot]

Commented by: ywwg
Date: 2014-12-22T21:39:33Z

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• Does this happen with waveforms other than RGB?
• Can you hear the audio?
• Can you print out the visual_playposition control object and see what it's doing?

[mixxxbot]

Commented by: daschuer
Date: 2014-12-22T22:29:05Z

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Thank you for help, on win xp it look similar.
I think we need to add a plausibility check on timeInfo at

mixxx/src/sounddeviceportaudio.cpp

Line 770 in 8738354

VisualPlayPosition::setTimeInfo(timeInfo);

A faulty value of timeInfo will be helpfull here. Are you able to break at the line above?
If not, no problem, we should be able to fix it without.

[mixxxbot]

Commented by: daschuer
Date: 2014-12-22T22:30:04Z

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It happens with all waveforms
I can hear Audio
can't print visual_playposition because I have no development environment.

[mixxxbot]

Commented by: daschuer
Date: 2014-12-23T23:18:14Z

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Fixed since 40bd85f
by disabling the waveform syncing.
Not sure if it possible to sync again with the effected sound APIs

It currently locks one sync value per deck in mixxx.log maybe we can find a pattern .. of fix it in portaudio.

[mixxxbot]

Commented by: daschuer
Date: 2014-12-23T23:18:56Z

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@jus: please check it with your issue.

[mixxxbot]

Commented by: ywwg
Date: 2014-12-23T23:51:23Z

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oh good, glad you caught this

[mixxxbot]

Issue closed with status Fix Released.