shithub: neindaw

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add vol command and dumb automixer

--- a/piper/README.md

+++ b/piper/README.md

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

 games/orca -u /fd/3 |[3] daw/piper /n/kick /n/ay

 ```

-Instances are created by piper automatically, but there is no

-automatic mixer connection yet, so still need to run `mixfs` and do

-manual `audio/pcmconv -i f32c1r44100` for each `data` entry.

+Instances are created by piper automatically, automatic mixing is

+enabled by default unless `-m` is passed.

 Piper accepts simple commands like so:

@@ -34,3 +33,5 @@

 it's `C2` *negative*.

 Commands can be separated with `;`.

+

+To change the global volume use `vol100` to set it to `1.0`.

--- a/piper/piper.c

+++ b/piper/piper.c

@@ -23,6 +23,7 @@

 static int bpm = 120;

 static float bar = 2.0;

+static float vol = 1.0;

 static QLock grouplock;

 static Group *groups;

 static int numgroups;

@@ -36,7 +37,7 @@

 static void

 usage(void)

 {

-	print("usage: %s DIR...\n", argv0);

+	print("usage: %s [-m] DIR...\n", argv0);

 	threadexitsall("usage");

 }

@@ -170,13 +171,49 @@

 			bpm = i;

 			bar = 240.0 / (float)bpm;

 		}

+	} else if (strncmp(s, "vol", 3) == 0) {

+		vol = atof(s+3) / 100.0;

 	}

 	return e;

 }

+enum {

+	Bufframes = 44100/100,

+};

+static void

+mixer(void *)

+{

+	int i, j, n;

+	s16int *pcm;

+	float *out, *x;

+	pcm = malloc(2*Bufframes*sizeof(*pcm));

+	out = malloc(Bufframes*sizeof(*out));

+	x = malloc(Bufframes*sizeof(*x));

+	for (;;) {

+		memset(out, 0, 44100/100*sizeof(*out));

+		qlock(&grouplock);

+		for (i = 0; i < numgroups; i++) {

+			for (j = 0; j < groups[i].numinst; j++) {

+				if (readn(groups[i].inst[j].data, x, Bufframes*sizeof(float)) < 1)

+					break;

+				for (n = 0; n < Bufframes; n++)

+					out[n] += x[n];

+			}

+		}

+		qunlock(&grouplock);

+		for (n = 0; n < Bufframes; n++) {

+			pcm[n*2+0] = pcm[n*2+1] = out[n] * 8192.0 * vol;

+		}

+		if (write(audio, pcm, 2*Bufframes*sizeof(*pcm)) < 0)

+			break;

+	}

+

+	threadexits(nil);

+}

+

 void

 threadmain(int argc, char **argv)

 {

@@ -183,9 +220,13 @@

 	char *s, t[256];

 	Synth *synth;

 	Biobuf *b;

-	int i, j, n;

+	int i, j, n, nomixer;

+	nomixer = 1;

 	ARGBEGIN{

+	case 'm':

+		nomixer = 1;

+		break;

 	default:

 		usage();

 	}ARGEND;

@@ -193,6 +234,9 @@

 	if (argc < 1)

 		usage();

+	if (!nomixer && (audio = open("/dev/audio", OWRITE)) < 0)

+		sysfatal("%r");

+

 	quotefmtinstall();

 	/* go through all groups */

@@ -227,6 +271,9 @@

 		if (synth == nil)

 			sysfatal("no name set in %s/metadata", argv[i]);

 	}

+

+	if (!nomixer)

+		proccreate(mixer, nil, 4096);

 	for (;;) {

 		if ((n = read(0, t, sizeof(t)-1)) < 1)