RE: MovieExportComponent codecname

• Subject: RE: MovieExportComponent codecname
• From: nick briggs <email@hidden>
• Date: Wed, 27 Sep 2006 11:17:43 +0100
• Delivered-to: email@hidden
• Delivered-to: email@hidden

replacing QTGetAtomDataPtr with QTCopyDataToPtr did the trick.

Thanks

Nick

Begin forwarded message:
From: nick briggs <email@hidden>
Date: 26 September 2006 20:31:03 BDT
To: email@hidden
Subject: Re: MovieExportComponent codecname

Thanks

don't you want GetComponentInfo()?

	ComponentDescription cd;
	Handle cn = NewHandle(0);
	Handle ci = NewHandle(0);
	err = GetComponentInfo(movieExporterComponent,
						   &cd,
						   cn,
						   ci,
						   nil);
	if(err){
		NSLog(@"GetComponentInfo err:%d", err);
        goto bail;
	}
	
	CopyPascalStringToC((const unsigned char*)*cn, (char*)*cn);
	NSLog(@"%@", [NSString stringWithCString:*cn]);
	
	CopyPascalStringToC((const unsigned char*)*ci, (char*)*ci);
	NSLog(@"%@", [NSString stringWithCString:*ci]);
	

Nick

On 26 Sep 2006, at 20:04, email@hidden wrote:
Message: 4
Date: Tue, 26 Sep 2006 15:00:12 +0100
From: nick briggs <email@hidden>
Subject: MovieExportComponent codecname
To: email@hidden
Message-ID: <email@hidden>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

Hi

Our aim is to read a MovieExportComponent's codecName, we've tried a
couple of approaches listed below, which  are clearly flawed, as
neither work.

How best to go about this?

In this case we are reading settings from an archived
QTAtomContainer, but we get the same problem if going via
MovieExportDoUserDialog

Here's one approach, SCGetInfo returns badComponentSelector.

-----------------------------------------

	OSErr err = noErr;
	QTAtomContainer settings;
	ComponentDescription compDesc;
     Component movieExporterComponent = 0;
	MovieExportComponent exporter = NULL;
	SCSpatialSettings ss;

	compDesc.componentType = MovieExportType;
     compDesc.componentSubType = kQTFileTypeMovie;
     compDesc.componentManufacturer = kAppleManufacturer;
     compDesc.componentFlags = 0;
     compDesc.componentFlagsMask = cmpIsMissing;
     movieExporterComponent = FindNextComponent(NULL, &compDesc);
     if (movieExporterComponent == NULL){
         return;
	}
     err = OpenAComponent(movieExporterComponent, &exporter);
     if (err){
         goto bail;
     }
	

	NSData *data = [[NSKeyedUnarchiver unarchiveObjectWithFile:path]
retain];
	if(data) {
		settings = NewHandle([data length]);
		if(settings) {
			[data getBytes:*settings];	
		}else{
			goto bail;
		}
	}	

	err = MovieExportSetSettingsFromAtomContainer(exporter, settings);
	if (err){
         goto bail;
	}
		
	err = SCGetInfo(exporter, scSpatialSettingsType, &ss);
	if (err){
		NSLog(@"SCGetInfo:%d",err);  //badComponentSelector
		goto bail;
	}

-----------------------------------------

Another approach, this time we get noCodecErr

-----------------------------------------

	OSErr err = noErr;
	QTAtomContainer settings;
	QTAtom videAtom = 0;
	QTAtom nameAtom = 0;	
	CodecInfo ci;
	SCSpatialSettings ss;
	

	NSData *data = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
	if(data) {
		settings = NewHandle([data length]);
		if(settings) {
			[data getBytes:*settings];	
		}else{
			goto bail;
		}
	}	
	
	videAtom = QTFindChildByID(settings, kParentAtomIsContainer,
kQTSettingsVideo, 1, NULL);
	if (!videAtom) {
		goto bail;
	}
	
	nameAtom = QTFindChildByID(settings, videAtom,
scSpatialSettingsType, 1, NULL); // scCodecManufacturerType
	if (!nameAtom) {
		goto bail;
	}
	
	
	long   dataSize, *dataPtr;
	err = QTGetAtomDataPtr(settings, nameAtom, &dataSize, (Ptr*)&dataPtr);
	if (err != noErr) {
		goto bail;
	}
	

	memcpy(&ss, &dataPtr, dataSize);
	err = GetCodecInfo(&ci, ss.codecType,ss.codec);
	if (err != noErr) {
		NSLog(@"err:%d", err); //noCodecError
		goto bail;
	}

-----------------------------------------

Cheers
Nick
	

_______________________________________________
Do not post admin requests to the list. They will be ignored.
QuickTime-API mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/quicktime-api/email@hidden

• Prev by Date: Re: Do output PCM samples require some special data handling before copying them to outputBuffer?
• Next by Date: QuickTime Player not using custom Reassembler
• Previous by thread: Re: MovieExportComponent codecname
• Next by thread: DisposeMovie and CoreAudio IOProcs
• Index(es):
  • Date
  • Thread