Hi Nathan,
I am not exactly sure what your problem is about. But here some hints:
Mixxx features two play position control object:
"playposition" and "visual_playposition"
"playposition" is updated rarely compared to "visual_playposition" to avoid
flooding the Qt event queue see
void EngineBuffer::updateIndicators(double rate, int iBufferSize);
When dejerking the waveform display I see additional issues with frequently
Qt events. So
i have introduced a Visual play position class with a timestamp:
See here:
http://bazaar.launchpad.net/~daschuer/mixxx/daschuers_trunk/view/head:/mixxx/src/visualplayposition.cpp
I hope that helps.
Kind regards,
Daniel
2013/3/17 Nathan Bannow <[email protected]>
> Hi,
>
> I have three ContolObjectThreads for tracking valueChanged events in
> Channel1 playposition, Channel2 playposition and the master crossfader.
>
> I am storing the channel playpositions in my class with volatile doubles,
> and updating them each time a valueChanged event occurs on that channel.
> (This is my naive method at the moment, which I think needs to be refined.)
>
> Then, when I get a crossfader event, I record the current values of the
> playpositions that I have along with the value of the crossfader.
>
> For example:
>
> MasterCrossfader:0.0252757241833457:0.0193490138654952:0.272754671488848
>
>
> This shows that channel 1 was at playposition 0.02527...,
>
> channel 2 is at : 0.01934...
>
> and the crossfader is at: 0.27275
>
>
>
> This system kind of works, but looking at the output generated, I am not
> confident that it is the correct way. Many times, I get duplicate
> playpositions in a row when the crossfader is changing:
>
>
> MasterCrossfader:0.0248450239290381:0.0187344885023211:0.0558569419328911
>
> MasterCrossfader:0.0248450239290381:0.0187344885023211:0.0813743218806509
>
> MasterCrossfader:0.0248450239290381:0.0187344885023211:0.0941330118545307
>
> MasterCrossfader:0.024988590680474:0.0188881198431147:0.11965039180229
>
> Note that the playpositions for channel 1 and 2 were the same for three
> crossfader events in a row.
>
>
>
> I have tried using both ContolObjectThread and ContolObjectThreadMain with
> similar results.
>
>
> Is there a way for me to get an accurate channel playback postion while in
> the middle of handling the mastercrossfader valueChanged event? Or do I
> need to have a method of tracking the positions via the playposition
> valueChanged events like I am currently attempting?
>
>
> Thank you,
>
> -Nathan
>
>
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