Re: NewMovieFromStorageOffset() replacement with NewMovieFromProperties() seems broken

On Nov 14, 2007, at 12:07 PM, Matthew Veenstra:

> I am trying to update my NewMovieFromStorageOffset to  
> NewMovieFromProperties so I can use visual contexts as necessary  
> etc. But I cannot seem to get this to work. I get the standard -50  
> paramErr on with NewMovieFromProperties. Below is the old that  
> works and new code that does not.
>
> // Here is the OLD code which works perfect.
> wide *anOffset;
> DataHandler aDataHandler = NULL;
> Movie aMovie = NULL;
>
> // keyTo... are just internal macros
> aDataHandler = keyToHandle(keyArgument(1));
> keyIfNULL(aDataHandler);
> anOffset = keyToPointer(keyArgument(2));
> keyIfError(NewMovieFromStorageOffset(&aMovie, aDataHandler, (wide  
> *) anOffset, newMovieActive | newMovieAsyncOK, NULL));
>
>
> // Here is the NEW code that _FAILS_.
> wide *anOffset;
> DataHandler aDataHandler = NULL;
> Movie aMovie = NULL;
>
> Boolean isActive = true;
> Boolean isAsync = true;
> Boolean dontResolve = true;
> Boolean ratePitch = true;
> QTAudioContextRef aAudioContextRef = NULL;
> QTVisualContextRef aVisualContext = NULL;
>
> QTNewMoviePropertyElement aMovieProperties[] = {
> {kQTPropertyClass_DataLocation,  
> kQTDataLocationPropertyID_QTDataHandler, sizeof(aDataHandler),  
> &aDataHandler, 0},
> {kQTPropertyClass_MovieResourceLocator,  
> kQTMovieResourceLocatorPropertyID_FileOffset, sizeof(anOffset),  
> &anOffset, 0},
> {kQTPropertyClass_NewMovieProperty, kQTNewMoviePropertyID_Active,  
> sizeof(isActive), &isActive, 0},
> {kQTPropertyClass_MovieInstantiation,  
> kQTMovieInstantiationPropertyID_AsyncOK, sizeof(isAsync), &isAsync,  
> 0},
> {kQTPropertyClass_MovieInstantiation,  
> kQTMovieInstantiationPropertyID_DontAskUnresolvedDataRefs, sizeof  
> (dontResolve), &dontResolve, 0},
> {kQTPropertyClass_Audio,  
> kQTAudioPropertyID_RateChangesPreservePitch, sizeof(ratePitch),  
> &ratePitch, 0},
> {kQTPropertyClass_Context, kQTContextPropertyID_AudioContext,  
> sizeof (aAudioContextRef), &aAudioContextRef, 0},
> {kQTPropertyClass_Context, kQTContextPropertyID_VisualContext,  
> sizeof (aVisualContext), &aVisualContext, 0}
> };
>
> // keyTo... are just internal macros
> aDataHandler = keyToHandle(keyArgument(1));
> keyIfNULL(aDataHandler);
> anOffset = keyToPointer(keyArgument(2));
> keyIfError(NewMovieFromProperties(sizeof(aMovieProperties) / sizeof  
> (QTNewMoviePropertyElement), aMovieProperties, 0, NULL, &aMovie));
>
> Has anyone tried this?
> The movie I am retrieve was added to the file with  
> PutMovieIntoStorage (). The headers say  
> kQTMovieResourceLocatorPropertyID_FileOffset is for  
> NewMovieFromDataFork but there is no other attribute I could find  
> that made sense.

I think your code is fine but you may be missing a step. It's hard to  
tell, since I don't know what keyToHandle(keyArgument(1)) is. I have  
used very similar code, with the difference that I have this  
additional line of code:

	status = OpenMovieStorage(dataReferenceRecord.dataRef,  
dataReferenceRecord.dataRefType, kDataHCanRead, &handler);

Are you doing anything like that? Does adding that line help?


Tim Monroe
QuickTime Engineering



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