Avoid insertion of FLLR chunk with ExtAudioFile wave files
Avoid insertion of FLLR chunk with ExtAudioFile wave files
- Subject: Avoid insertion of FLLR chunk with ExtAudioFile wave files
- From: Iain McCowan <email@hidden>
- Date: Tue, 09 Aug 2011 13:28:26 +1000
Hello,
I use the ExtAudioFile API to create and manipulate wave files.
I am having an issue integrating with a third-party software that does not correctly parse the .wav files produced using the ExtAudio functions.
The problem has been isolated to the FLLR chunk that the Apple library adds to align the data.
I know that strictly speaking the decoder should ignore FLLR chunk and is therefore incorrect, but I have no control over this and it's not the first time I've hit this issue.
And yes, I need to use wave format for this third-party software integration.
So my question then: Given this FLLR chunk is a "non-standard" feature, is there any known simple way to instruct the ExtAudioFile apis to not insert the FLLR chunk in waves?
I have searched the headers for format flags or properties, but haven't seen anything obvious that might control this.
Failing this, I will of course resort to other wave file library functions, or attempt to hack out the offending bytes from the wave file, but it would be nice to avoid this if I can.
thanks,
Iain.
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