[PD] [readanysf~] and so called interleaved wav files.
august at alien.mur.at
Wed Dec 16 14:53:48 CET 2009
> > Can you put the files online somewhere so I can download them and test
> > them?
> Of course:
> this plays fine:
> this plays, but no sound:
> <don't know if i can post that link on the list>
Why does that link not go through to the list? hmm.
Anyway, if you set up readanysf~ with 8 channel output, both DO play
just fine. The second one is playing, but is VERY soft....just jack up
the amplitude multiplication on it. Readanysf~ doesn't normalize your
audio for you.
> BTW: Is there some documentation about how [readanysf~] (or the
> underlying layer) tries to assign the channels, when the number of
> channels created and the number of channels of the loaded file do not
no. this is all undefined as it comes from gavl. Thank you for
bringing it up though. I am now in discussion with the developer about
making an arbitrary mix matrix for mixing channels. I also found a bug
in gavl that makes readanysf~ crash if you start it with, say, 4
channels, but feed it an 8 channel audio.
So, this will have to change for the next version.
Here is what I plan...let me know what y'all think.
Because of how PD works, I can only define the number of out channels at
object creation. (right?) I cannot match the output number of channels
to the input number of channels for any given file.
The way I would like it to work by default is:
for mono output:
* for all input except stereo, just the first channel is played
* for stereo input, it is downmixed
for stereo output:
* mono input will be upmixed to stereo
* 3 or more channel input will just drop the channels after the
for 2+ channel output:
* mono input is upmixed to stereo, remaining channels are empty
* if input has less channels than output, all input channels are
sent to output in order. any remaining output channels are left
* if input has more channels thant output, all output channels
are filled with corresponding input channel. the remaining input
channels are not sent to output.
I don't know if it makes sense to have special default cases for mono
More information about the Pd-list