[PD] [readanysf~] and so called interleaved wav files.

august august at alien.mur.at
Tue Dec 15 15:33:35 CET 2009

> On Tue, 2009-12-15 at 00:13 +0100, Roman Haefeli wrote:
> > Hi all
> > 
> > I'm trying to build an application that supports loading as many
> > different WAV-formats as possible (primarily different bit-depths and
> > number of channels). I found, that when focussing on PCM-encoded files
> > only, the variety of formats is still big. Actually, i'd like the
> > application to auto-recognize the number of channels of loaded files.
> > Since [readanysf~] doesn't do that, i use also [ext13/wavinfo] to gather
> > some data about the files. Unfortunately, this externals doesn't read
> > files with a so-called 'broadcast' format. But this is a different
> > story. 
> > Then i encountered, that there is something called 'interleaved' format.
> > Those multi-channel files are read fine by [readsf~], but not by
> > [readanysf~]. I have a 8-channel-interleaved file, which [readanysf~]
> > seems to play (according to the right most outlet), but all output
> > channels are mute. However, 8-channel-files i created myself, seem to
> > work well with both, [readsf~] and [readanysf~]. I have another
> > 6-channel interleaved files, which only 5 are played from by
> > [readanysf~]. 
> > Now, i wonder what is the magic behind those 'interleaved' files and
> > also, if there is a way to play them in Pd _AND_ have a 'seek' option as
> > [readanysf~] offers?
> Googling some more makes me believe, that 'interleaved' does mean
> nothing more than just 'many audio channels interleaved into one single
> file'. So actually both my 8-channel WAV-files are interleaved. Both are
> 8ch 16bit 44100Hz PCM files and still they are different in that only
> one of them is read correctly by [readanysf~]. 
> * How can i get info about PCM-WAV files in Pd?
> * How can i reliably play them back (with the ability to seek)?

Can you put the files online somewhere so I can download them and test


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