The alsa-lib is a library to interface with ALSA in the Linux kernel and virtual devices using a plugin system.
The up-to-date reference generated from sources can be accessed here:
http://www.alsa-project.org/alsa-doc/alsa-lib/
You may give a look for more information about the ALSA project to URL http://www.alsa-project.org.
The preferred way to submit patches is by sending them by email to the alsa-devel mailing list. Sending mail to the list requires subscription, subscribe here: https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
Add Takashi Iwai <tiwai@suse.de> and/or Jaroslav Kysela <perex@perex.cz> to
Cc so that your patch won't be missed.
Patches are also accepted as GitHub pull requests.