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Re: AudioFileComponents
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Re: AudioFileComponents


  • Subject: Re: AudioFileComponents
  • From: Francisco Gimeno <email@hidden>
  • Date: Tue, 13 Sep 2005 23:47:57 +0200


Lets take one of these data formats and imagine we have this available as an AudioCodec. What does that give me? (Lets take FLAC as the example)
(1) I could read or write a CAF file with FLAC data in it - CAF files (CoreAudioFormat Files) can take any audio data format
(2) I could read or write a Movie file with FLAC data in it - Movie files can also contain any audio data format

These will both work with QT 7 (or Tiger) as it is today.

(3) With an Ogg AFC, I could also read or write Ogg files with FLAC data

Ok, but I have the impression that this is not enough for *all* applications in Tiger.  It's not at all clear to me which applications use which APIs and require which components/codecs/etc.  Personally, I'm primarily interested in making iTunes happy with ogg/vorbis for the moment.  Will that require the eat/spit components?

Yes.
it's any way for doing the qtcomponent reusing the AudioCodec and AudioFileComponent? was that in mind when Core Audio { AudioCodec + AudioFile } was developed?
The question is that there is a existing qtcomponent [1] for Ogg that has been broken for a QuickTime API change that hasn't been detected so far.

It could seems the order of GetDataSource calls could be changed or a structure not being initialized or something. Debugging the qtcomponent has taken 2/3 days for me with no success at all.

It has  been talked a lot on this list and Quicktime-api about that, but not conclusion at all. Now I'm thinking to back to the debug ( as far I have started the work on OggAudioFormatComponent ).

[1] http://qtcomponents.sourceforge.net

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