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sdl/audio: set pipe buffer size when running pcmconv; use the correct device name

--- a/libnpe_sdl2/audio.c

+++ b/libnpe_sdl2/audio.c

@@ -144,6 +144,16 @@

 	return ssz;

 }

+static void

+setpipebuf(int f, int sz)

+{

+	Dir d;

+

+	nulldir(&d);

+	d.length = sz;

+	dirfwstat(f, &d);

+}

+

 SDL_AudioDeviceID

 SDL_OpenAudioDevice(char *dev, int rec, SDL_AudioSpec *want, SDL_AudioSpec *have, u32int change)

 {

@@ -196,6 +206,7 @@

 		if((fd = open(a->name, a->mode)) < 0)

 			goto err;

 		pipe(p);

+		setpipebuf(p[0], a->bufsz);

 		if((a->pidconv = rfork(RFPROC|RFNOTEG|RFFDG|RFCENVG)) == 0){

 			dup(fd, rec ? 0 : 1); close(fd);

 			dup(p[0], rec ? 1 : 0); close(p[0]);

@@ -211,7 +222,7 @@

 		a->fd = p[1];

 		close(p[0]);

 		close(fd);

-	}else if(a->fd < 0 && (a->fd = open("/dev/audio", a->mode|OCEXEC)) < 0)

+	}else if(a->fd < 0 && (a->fd = open(a->name, a->mode|OCEXEC)) < 0)

 		goto err;

 	return id;