2013/4/30 Fred van Stappen <fi...@hotmail.com> > This about audio and fpc and fpGUI and LCL and Linux. (working good with > Windows) > Have some trouble with threads synchronize() procedure. > The main thread.execute is a loop to read-write audio data. > Inside the loop i use synchronize(myProc) to synchronize some graphic > component ( like taskbar.position, position.text,...). With LCL the graphic > synchro is good and the quality of sound is ok and not altered with > synchronize(myProc). With fpGui the synchro is good but not the quality of > sound. > Some audio chunk are omitted when using synchronize(myProc). > > I was thinking that the reason was the Graphic-refresh but it is not. > If i do a synchronize(dummyproc) i have the same bad result. > Without synchronize(dummyproc), the sound is perfect. > Here some code : > > >>The main thread.execute > procedure TUOS_Player.Execute; > begin > ... > repeat > ... > if LoopProc <> nil then synchronize(LoopProc); > ... > end; > end; > > >> And here LoopProc := DummyProc : > > Procedure TSimpleplayer.DummyProc ; > > begin > // Nothing ! > end; > I have a test example for Linux 64 bit. > > There are 3 binaries from same code : fpGUI, GTK2, Qt. > > On the fpGUI demo, there are 3 checkboxs more, > - With syhchro Grahic > - With synchro Dummy > - Without syhchro > > On my slow computer, the sound is altered while using synchro, even if the > proc is dummy ! > Why, what do synchronize() if the procedure is dummy ? > Here the demo test > :*https://sites.google.com/site/fiensprototyping/fpGUI_UOStest.tar.gz* > Download the zip file, and run the binaries in root folder (everything is > included and ready to use). > The source are in src. > > Many thanks > > Try Queue instead Syncronize.
-- Silvio Clécio My public projects - github.com/silvioprog
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