On 06/05/2020 1:09 p.m., frede...@ofb.net wrote:
Dear R Devel,
Since Linux moved away from using a file-system interface for audio, I think it
is necessary to write special libraries to interface with audio hardware from
various languages on Linux.
In R, it seems like the appropriate datatype for a `snd_pcm_t` handle pointing to an open ALSA source or sink would be a
"connection". Connection types are already defined in R for "file", "url", "pipe",
"fifo", "socketConnection", etc.
Is there a tutorial or an example package where a new type of connection is
defined, so that I can see how to do this properly in a package?
I can see from the R source that, for example, `do_gzfile` is defined in
`connections.c` and referenced in `names.c`. However, I thought I should ask
here first in case there is a better place to start, than trying to copy this
code.
I only want an object that I can use `readBin` and `writeBin` on, to read and
write audio data using e.g. `snd_pcm_writei` which is part of the `alsa-lib`
package.
I don't think R supports user-defined connections, but probably writing
readBin and writeBin equivalents specific to your library wouldn't be
any harder than creating a connection. For those, you will probably
want to work with an "external pointer" (see Writing R Extensions).
Rcpp probably has support for these if you're working in C++.
Duncan Murdoch
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