Run an external command as the music stream.
int Mix_SetMusicCMD(const char *command);
Returns 0 if successful, -1 on error
This halts any currently-playing music, and next time the music stream is played, SDL_mixer will spawn a process using the command line specified in
command. This command is not subject to shell expansion, and beyond some basic splitting up of arguments, is passed to execvp() on most platforms, not system().
The command is responsible for generating sound; it is NOT mixed by SDL_mixer! SDL_mixer will kill the child process if asked to halt the music, but otherwise does not have any control over what the process does.
You are strongly encouraged not to use this function without an extremely good reason.
This function is available since SDL_mixer 2.0.0.