Finds the first available channel in a group of channels.
Defined in SDL_mixer.h
| tag | an arbitrary value, assigned to channels, to search for. |
Returns first available channel, or -1 if none are available.
A tag is an arbitrary number that can be assigned to several mixer channels, to form groups of channels.
This function searches all channels with a specified tag, and returns the channel number of the first one it finds that is currently unused.
If no channels with the specified tag are unused, this function returns -1.
This function is available since SDL_mixer 3.0.0.