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buffer proc for mixer

greases the wheel for midi to keep up at the cost
of some latency. For background music type stuff
this really doesn't matter.

--- a/libnpe_sdl2/mixer.c

+++ b/libnpe_sdl2/mixer.c

@@ -8,9 +8,7 @@

 static int forkerpid = -1;

 static int audiopid = -1;

-void audioexec(void *);

-void audioforker(void *);

-void audioproc(void *);

+void musicproc(void *);

 static int musicvol = 128;

 static int musicpaused = 0;

@@ -139,10 +137,16 @@

 	doneinit = 1;

 	memset(channels, 0, sizeof channels);

 	rfork(RFNAMEG);

-	if(rfork(RFPROC|RFFDG) == 0){

+	if(fork() == 0){

 		execl("/bin/audio/mixfs", "mixfs", nil);

 		sysfatal("exec: %r\n");

 	}

+	waitpid();

+	pipe(musicpipe);

+	if(fork() == 0){

+		musicproc(nil);

+		sysfatal("exec musicproc: %r");

+	}

 	return flags;

 }

@@ -207,7 +211,10 @@

 	while(loops == -1 || n-- > 0){

 		switch(rfork(RFPROC|RFFDG)){

 		case 0:

-			execl("/bin/games/midi", "midi", music->loc, nil);

+			dup(musicpipe[1], 1);

+			close(musicpipe[1]);

+			close(musicpipe[0]);

+			execl("/bin/games/midi", "midi", "-c", music->loc, nil);

 			sysfatal("exec: %r");

 			break;

 		default:

@@ -254,4 +261,25 @@

 	if(freesrc)

 		SDL_RWclose(src);

 	return m;

+}

+

+void

+musicproc(void *)

+{

+	int fd;

+	static char buf[8192];

+	int n;

+

+	fd = open("/dev/audio", OWRITE);

+	if(fd < 0)

+		sysfatal("musicproc: %r");

+

+	close(musicpipe[1]);

+	threadsetname("musicproc");

+	for(;;){

+		n = read(musicpipe[0], buf, sizeof buf);

+		if(n < 0)

+			threadexits(nil);

+		write(fd, buf, n);

+	}

 }