On Sunday 09 April 2006 09:27, matt ingalls wrote:

> On Apr 8, 2006, at 7:40 PM, Istvan Varga wrote:
> 
> > On Saturday 08 April 2006 18:24, matt ingalls wrote:
> >
> >> well, better than nothing.
> >> csound is creating peak chunks still, right?
> >
> > Yes, as far as I know. I just did not find a way to read the peak  
> > chunks
> > using the libsndfile API.
> 
> does libsndfile automatically create peak chunks or do you need to   
> create a peak chunk manually through the libsndfile API ?

Peak chunks are enabled by the following code:

    if (csound->peakchunks)
      sf_command(ST(outfile), SFC_SET_ADD_PEAK_CHUNK, NULL, SF_TRUE);

Note that this apparently only works for WAV and AIFF files and floating
point samples (quoting from libsndfile sources):

        case SFC_SET_ADD_PEAK_CHUNK :
        {
            int format = psf->sf.format & SF_FORMAT_TYPEMASK ;

            /* Only WAV and AIFF support the PEAK chunk. */
            if (format != SF_FORMAT_WAV &&
                format != SF_FORMAT_WAVEX &&
                format != SF_FORMAT_AIFF)
                return SF_FALSE ;

            format = psf->sf.format & SF_FORMAT_SUBMASK ;

            /* Only files containg the following data types
               support the PEAK chunk. */
            if (format != SF_FORMAT_FLOAT &&
                format != SF_FORMAT_DOUBLE)
                return SF_FALSE ;
        } ;

> it the latter, there must be a way to read the chunk, right ?

I have not found a command to read peak chunks, only to create them.


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