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Archive of posts for wdmaudiodev at FreeLists
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    Ifyouhavetheproperhardware(i.e.afractionalPLL)theadjustmentsyoucan maketothelocalclockareextremelyprecise(typically0.01ppm)Ifyouthen alsoimplementalow-passfilterbehaviorontheclockadjustmentalgorithmand deployveryextensiveaveraging,youcanachieveaudioclockqualitylevels thatarebeyondwhatcurrentADCsandDACsrequire. Goingwiththeasynchronousmodeactuallyshifts(notsolves)theproblemto theHost.IftheHosthassufficientlysophisticatedasynchronoussamplingrate algorithmsavailable,thenthatmaybeagoodsolution.Butdonotassumethat allqualityconcernsevaporatewhenyouswitchtoasyncmode. ...

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    inthereliesthetruth,the opertativephrasehereisIfyouhavetheproper hardware...thepreviousposterisattemptingtosolvethisageoldproblem mostlyinsoftware...also,aSOCthatnativelyhasanIntegerPLL(alongwith afewothergoodies)canactually(hasactually)solvethisproblem,andfor bothclocktrees,andfromasingleexternalcrystal...soonereallycanpull arabbitoutofahat;) Ihaven'tranintomanyearsthatcandothePepsichallengewithASYNCvs SYNC(properlydoneinhardware,asGeertlaysoutbelow)andactuallytellthe difference,butIhavehadtheprivilegeofmeetingonesuchsole(ataworld renownedmusicstudio)thatcouldhearthedifference,itwastrulyanamazing ...

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    Well, HavesomeissuesonWindows7/64bitandmaygetheresomelightonthis WASAPIissues: ...

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    Thank you all for the insightful conversation, learned a lot here.. The SOC I'm using has fractional clocks that can be adjusted by 0.02%. I implemented ISO sync as that was outlined by our customer in their spec.. From all I read before, everyone seemed to be in consensus that ISO Async is the way to go.. As for now I've heard no pops/clicks ever since I implemented the clock matching.. From reading this thread, fractional clocks on SOC may just be good enough as long as the clock matching is done in hardware. I hope I get ...

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    Acoupleofpoints: Usingextensiveaveragingontheclockusuallymeansyouneeddeepaudio buffers-sonotasolutionifyouneedlowlatency. Myunderstandingofsoftwaresamplerateconversioninthewindowssystemis thatitsimplyassumesthedeclaredsampleratesarecorrectandappliesa fixedsamplerateconversion.Whichisthecorrectsolutionforthemostpart (asopposedtoasync.SRCwithsomeattempttomeasuretheactualinstantaneous samplerate).Inwhichcase,thequalitycouldbequitegood.Ofcourse,an ...

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    AkshaykeertiSharmawrote: Thankyouallfortheinsightfulconversation,learnedalothere.. Yes,thishasbeenoneofthemorefruitfulandeducationaldiscussions I'veseenonatechnicallistinquiteawhile. Inowhaveapretty clearnotionofhowtosolvemyproblem. Thankstoeveryoneinvolved. -- ...

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    ISOsynchronizationmethod(USBbasespec)hasnothingtodowithaudiosample rateconversion(SRC)-differenttopics/discussionsaltogether Acoupleofpoints: Usingextensiveaveragingontheclockusuallymeansyouneeddeepaudio buffers-sonotasolutionifyouneedlowlatency. ...

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    On19.OctIreportedissuesonWin7WASAPIExclusiveanddonothaveany lightsonthisissue/bug! Itestedwiththegiven“Play-Exclusive”CPPexamplegivenformMatthewvan Eerdewithequalfailed/buggydriverinitializeresult. ...

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    0x8007007aisHRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER).Itislikelythat thedriverisreturningafailingNTSTATUScodefromKsCreatePinwhichisbeing mappedtoERROR_INSUFFICIENT_BUFFER. IfyoucangetthistoreproonWindows10,pleasefileaproblemreportin FeedbackHubwithAudioGlitchestracing. ________________________________ From:wdmaudiodev-bounce@xxxxxxxxxxxxxwdmaudiodev-bounce@xxxxxxxxxxxxxon ...

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    IfyouwouldlikehelpwithaWindowsissueonversionspriortoWindows10, pleasecontactMicrosoftSupport- ________________________________ From:wdmaudiodev-bounce@xxxxxxxxxxxxxwdmaudiodev-bounce@xxxxxxxxxxxxxon behalfofHpW-WorksSupportsupport@xxxxxxxxxxxxx Sent:Monday,October30,201710:50:28AM To:wdmaudiodev@xxxxxxxxxxxxx Subject:[wdmaudiodev]Re:Windows7(only)WASAPIExclusiveIssue/Bug ...

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    Hi Whatistheformatofyour4khz.wav.DoesNVIDIAandRealtekdevice supporttheformatofyour4khz.wav?Maybetheproblemistheformatofyour 4khz.wavisnotsupportbyNVIDAandRealtekdevicessoitgetfailed.  寄件者:HpW-WorksSupportsupport@xxxxxxxxxxxxx 收件者:wdmaudiodev@xxxxxxxxxxxxx 寄件日期:2017/10/31(週二)1:50AM 主旨:[wdmaudiodev]Re:Windows7(only)WASAPIExclusiveIssue/Bug #yiv2212497417#yiv2212497417--_filtered#yiv2212497417{panose-1:245354 ...

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    Iinvestigatedsomemoreonthatmatter😃 Summary: 1.SimpleabugusingWASAPIExclusiveusingax86appasPlay-Exclusive ...

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    ThiscertainlysoundslikeaWindowsbugtome,particularlyintheWOW64 emulationlayer(probablyksthunk.sys) ________________________________ From:wdmaudiodev-bounce@xxxxxxxxxxxxxwdmaudiodev-bounce@xxxxxxxxxxxxxon behalfofSupportHpW-Works.comsupport@xxxxxxxxxxxxx Sent:Tuesday,October31,20172:45:19AM To:wdmaudiodev@xxxxxxxxxxxxx Subject:[wdmaudiodev]Re:Windows7(only)WASAPIExclusiveIssue/Bug ...

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    ForissuesonversionsofWindowspriortoWindows10,pleasecontactMicrosoft Supportdirectly.Ican’thelpyouwiththose. ________________________________ From:wdmaudiodev-bounce@xxxxxxxxxxxxxwdmaudiodev-bounce@xxxxxxxxxxxxxon behalfofHpW-WorksSupportsupport@xxxxxxxxxxxxx Sent:Tuesday,October31,201711:26:03AM To:wdmaudiodev@xxxxxxxxxxxxx Subject:[wdmaudiodev]Re:Windows7(only)WASAPIExclusiveIssue/Bug ...

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    Mayhelpinthisregardwhilelostintothedark(NoSound/WASAPITopics) AlsoIdonothaveanycontractsupport.. ...

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    AsIunderstandthingsthesupportfeeiswaivediftheissueisonMicrosoft’s side,soIwouldn’tworryaboutthesupportcontract. Noneoftheoptionsinthatdropdownlistlookcorrecttome.Solet’ssay,oh, SystemPerformance(whynot.) ________________________________ From:wdmaudiodev-bounce@xxxxxxxxxxxxxwdmaudiodev-bounce@xxxxxxxxxxxxxon behalfofSupportHpW-Works.comsupport@xxxxxxxxxxxxx Sent:Tuesday,October31,201712:44:30PM ...

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    HiMatthew, ThepointisthatIdonothave499$forgamble… whileitismayadriverissuefromLynx,NVIDIA,Realtek(andnotMS related)andintheotherhandthosefromRMEThesyconsimpleworks😃 ...

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    DoesitreprowiththeMicrosoftHighDefinitionAudioclassdriver? ________________________________ From:wdmaudiodev-bounce@xxxxxxxxxxxxxwdmaudiodev-bounce@xxxxxxxxxxxxxon behalfofSupportHpW-Works.comsupport@xxxxxxxxxxxxx Sent:Tuesday,October31,20171:16:38PM To:wdmaudiodev@xxxxxxxxxxxxx Subject:[wdmaudiodev]Re:Windows7(only)WASAPIExclusiveIssue/Bug ...

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    HiMatthew, Bingo:YESwithsameresultsasNOKonx86OKonamd64😉 ...

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    OK,thensinceyou’rerunningaMicrosoftapponaMicrosoftOSonaMicrosoft driver,it’sdefinitelyaproblemontheMicrosoftside. ________________________________ From:wdmaudiodev-bounce@xxxxxxxxxxxxxwdmaudiodev-bounce@xxxxxxxxxxxxxon behalfofSupportHpW-Works.comsupport@xxxxxxxxxxxxx Sent:Wednesday,November1,20171:56:18AM To:wdmaudiodev@xxxxxxxxxxxxx Subject:[wdmaudiodev]Re:Windows7(only)WASAPIExclusiveIssue/Bug ...

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    Me?No–butyoushouldfeelfreetodoso. ________________________________ From:wdmaudiodev-bounce@xxxxxxxxxxxxxwdmaudiodev-bounce@xxxxxxxxxxxxxon behalfofHpW-WorksSupportsupport@xxxxxxxxxxxxx Sent:Wednesday,November1,20179:43:46AM To:wdmaudiodev@xxxxxxxxxxxxx Subject:[wdmaudiodev]Re:Windows7(only)WASAPIExclusiveIssue/Bug ...

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    Hithere! IhaveissueswithMIDIportsnotbeingavailableinthesystemwhenthe MicrosoftWindows10UAC2driverisloaded(latestversion10.0.17025.1000from Windows10InsiderPreviewBuild17025.rs_prerelease.171020-1626). Microsoftdocumentationat ...

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    CanyougointoDeviceManager,viewbycontainer,expandtheperipheralin question,andsendascreenshot? ________________________________ From:wdmaudiodev-bounce@xxxxxxxxxxxxxwdmaudiodev-bounce@xxxxxxxxxxxxxon behalfofFranzDetrofranz.detro@xxxxxxxxxxxxxxxxxxxxx Sent:Wednesday,November8,20177:28:00AM To:wdmaudiodev@xxxxxxxxxxxxx Subject:[wdmaudiodev]USBAudioClass2driverandMIDI ...

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    OK,pleasefileaproblemreportinFeedbackHub;useHardware,Devices,and Drivers|Audioandsound;oncefiledusethe“Share”widgettosendmea directlink. ________________________________ From:wdmaudiodev-bounce@xxxxxxxxxxxxxwdmaudiodev-bounce@xxxxxxxxxxxxxon behalfofFranzDetrofranz.detro@xxxxxxxxxxxxxxxxxxxxx Sent:Thursday,November9,20173:25:54AM ...

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    Youcanwritean.infthatwrapswdma_usb.infbutspecifies PKEY_AudioEngine_OEMFormattofavor8kHz16bit. Butwhydoyouwanttofavor8kHzifthedevicesupports48kHz? ________________________________ From:wdmaudiodev-bounce@xxxxxxxxxxxxxwdmaudiodev-bounce@xxxxxxxxxxxxxon behalfofAkshaykeertiSharmaasharma@xxxxxxxxxxxxxxxxxxxxx Sent:Wednesday,November8,20173:52:19PM To:wdmaudiodev@xxxxxxxxxxxxx ...

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    Pleaserelaymy“why”questiontothecustomer.Iftheyanswerit,relaythe answertome.(Oryoucangivemycontactinformationtothemandaskthemto contactmedirectlyifyoulike.) Theanswertoyourquestionis,no,thereisnowayforaUSBAudio1.0device toconveyapreferredformattoWindowswithoutacustomdriver(oratleasta custom.inf.) Thedevicetellsthedriverwhatitsupports;thedrivertellsWindows;and Windowschoosestheformatthatitthinksisbest. ...

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    OK,pleasefileaproblemreportinFeedbackHub;useHardware,Devices,and Drivers|Audioandsound;oncefiledusethe“Share”widgettosendmea directlink. Icanconnectwiththedevelopersthroughasupportincidentifnecessary. ...

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    HelloMatthew, doyouhaveanynewsonthis? OK,pleasefileaproblemreportinFeedbackHub;useHardware,Devices,and Drivers|Audioandsound;oncefiledusethe“Share”widgettosendmea directlink. ...

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    Theinternalbugnumberis14610254whichmayhelpyouifyouwanttocreatea supportincident. From:FranzDetro Sent:Friday,November17,20171:23AM To:wdmaudiodev@xxxxxxxxxxxxx Subject:[wdmaudiodev]Re:USBAudioClass2driverandMIDI HelloMatthew, ...

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    Hello! Windows10(16299,15063andmaybeearlierversions)issuesseveral KSPROPERTY_PIN_PROPOSEDATAFORMAT/SETpropertyrequestsafterIRPsink interfacearrival.Someoftheserequestscontainobviouslyinvalid data. WatchingforKSDATAFORMATcontents,Iseethatthesamedataare passedinconsecutiverequests,exceptvaryingSubFormatfield: ...

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    NoteveryKSDATAFORMATisaKSDATAFORMAT_WAVEFORMATEX.Youcantellwhethera givenKSDATAFORMATisaKSDATAFORMAT_WAVEFORMATEXbylookingattheFormatSize andSpecifierfields. AKSDATAFORMAT_WAVEFORMATEXwillhaveSpecifier== KSDATAFORMAT_SPECIFIER_WAVEFORMATEXandaFormatSize= sizeof(KSDATAFORMAT_WAVEFORMATEX). ...

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    I'mafraidyoudidn'tunderstoodme. Asyoucanseefrommytextandattachedimages,Specifierfield alwaysisKSDATAFORMAT_SPECIFIER_WAVEFORMATEX.FormatSize(0x40),of course,islessthansizeof(KSDATAFORMAT_WAVEFORMATEX)(0x52). Insuchconditions,mydriverfailssuchrequestsasinvalid. ButtheserequestsaregeneratedbyWindowsAudioSubsystemona regularbasis. ...

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    MypointisthatifFormatSizeissizeof(KSDATAFORMAT),thenitisillegalto evenlookattheWAVEFORMATEX,soitismeaninglesstosaythatdatais “invalid.” Canyoutakeamemorydumpofsuchacallinprogressandsendittome?Ican lookatthestackandtrytofigureoutwhyWindowsismakingthecall. ...

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    reg.wad@xxxxxxxxxxxxxxwrote: KSPROPERTY_PIN_PROPOSEDATAFORMAT/SETpropertyrequestsafterIRPsink interfacearrival.Someoftheserequestscontainobviouslyinvalid data. It'snotobviouslyinvaliddata. AsMatthewsaid,whenFormatSizeis lessthanKSDATAFORMAT_WAVEFORMATEX,thenit'snota KSDATAFORMAT_WAVEFORMATEX,sothereisnoassociatedWAVEFORMATEX structure. Itcouldbetryingtoexplorewhetheryouaregenerically ...

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    HelloTim, notaKSDATAFORMAT_WAVEFORMATEX,sothereisnoassociated WAVEFORMATEXstructure. Butwhatcouldbeareasonforsuchlogic? KSPROPERTY_PIN_PROPOSEDATAFORMATisthespecificdataformat propertyrequest,notawide-purpose,universalone.MSdocssaidthat propertyvalueisKSDATAFORMAT,therearenoothervaluetypes. ...

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    *Whatcouldbeareason Dunno.GivemeadumpfileandI’lltellyoubasedonthestack.Ifit’sa Windowsbugthestackwillidentifytheculprit. ________________________________ ...

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    HelloMatthew, tome?IcanlookatthestackandtrytofigureoutwhyWindowsismaking thecall. Thankyouforhelp.IhavesentdumpfilelinktoyouremailatMS domain. Thestackshowsthatpropertyrequestwasissuedbysvchost.exe ...

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    TheAudioPositionPropertyarticle ( saysthatWaveRTdrivercanprovidepositionregistervaluedirectly asGetPositionresult: =============== Someaudiohardwarecontainsapositionregistertokeeptrackofthe byteoffsetofthesamplecurrentlyineachDACorADC,inwhichcase theGetPositionmethodsimplyretrievesthecontentsoftheposition registerfortheappropriatestream. ...

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    Forthe“positionregister”valueareyoulookingat KSPROPERTY_RTAUDIO_POSITIONREGISTER,or KSPROPERTY_RTAUDIO_PRESENTATION_POSITION,orboth? ________________________________ From:wdmaudiodev-bounce@xxxxxxxxxxxxxwdmaudiodev-bounce@xxxxxxxxxxxxxon behalfofEugeneMuzychenkoreg.wad@xxxxxxxxxxxxxx Sent:Thursday,December7,20171:14:19AM ...

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    HelloMatthew, KSPROPERTY_RTAUDIO_POSITIONREGISTER,or KSPROPERTY_RTAUDIO_PRESENTATION_POSITION,orboth? KSPROPERTY_RTAUDIO_POSITIONREGISTERonly.I'mtryingtomakeamost compatibleRTAudioclient. Regards, ...

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    TL:DR;thissoundslikeabugineithertheMicrosoftHDAudioclassdriver, theRealtekdriver,theHDAudiocontrollerdriver,orthehardware. MakinganRTAudioclientischallengingbecausethereareseveralflavorsof RTAudio: 1.Packetstreaming- KSPROPERTY_RTAUDIO_GETREADPACKET/KSPROPERTY_RTAUDIO_SETWRITEPACKET 2.RTstreaming ...

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    HelloMatthew, RTAudio: Yes,Iunderstand.Inmyexperiments,basicRTstreaming(introducedin Vista)isreliableenough. KSPROPERTY_RTAUDIO_GETREADPACKET/KSPROPERTY_RTAUDIO_SETWRITEPACKET ...