Re: [Osalp-dev] Saving files...

[Hugh M. <hu...@mo...>]

I think I've found part of the problem....

Again, maybe I'm doing something wrong, or maybe it's a dodgy file writer...

But when I look at a dump of my created file, the 'length' field (bytes 4-7) is set to 0. Am I missing a function to write this later, or is the code at fault?

I know this is a pretty quiet list, but I'd love any info I can get on this...

Cheers

Hugh Macdonald (at a slightly different e-mail address)

On Thu, 4 Nov 2004 09:08:32 +0000
Hugh Macdonald <hug...@gm...> wrote:

> I've been using osalp for a short while now for opening files (which I
> then store in a custom format before passing to libquicktime), but I'm
> now trying to go the other way, and am having slight problems....
> 
> Here's a chunk of my code:
> (audioData is a 2D array of size audioChans*audioSamples)
> 
> aflibConfig sInfo;
> aflibStatus sStatus;
> 
> sInfo.setChannels(audioChans);
> sInfo.setSampleSize(AFLIB_DATA_16S);
> sInfo.setSamplesPerSecond(audioSampleRate);
> sInfo.setTotalSamples(audioSamples);
> 
> aflibFile *sFile = aflibFile::create("AIFF", audioFile, sInfo, &sStatus);
> if(sStatus != AFLIB_SUCCESS)
> {
>   // Check what the error is, print error message and return
> }
> aflibData audData(sInfo, audioSamples);
> for(chan = 0; chan < audioChans; chan++)
> {
>   for(sample = 0; sample < audioSamples; sample++)
>   {
>     audData.setSample(audioData[chan][sample], sample, chan);
>   }
> }
> sFile->afwrite(audData);
> 
> 
> At the end of this, I have my file, but the header information seems
> to be corrupt... I've got a tool for printing out the header
> information of a .aif file - it uses libsndfile (this was what I used
> before I discovered osalp) - this gives correct header information
> except the number of frames (samples) which it reports as 0.
> 
> The other thing that's bugging me (which I suspect I can't do anything
> about) is that I don't seem to be able to set the format as "AUTO"
> when creating a file - If I do, I get
> AFLIB_ERROR_INITIALIZATION_FAILURE - it's not going to be too hard for
> me to write code that checks the needed extension and gives the right
> format, but I was surprised that this wasn't what "AUTO" did....
> 
> anyway, cheers for any help...
> 
> -- 
> Hugh Macdonald
> 
> 
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-- 
Hugh Macdonald
The Moving Picture Company