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zuke: basic replay gain support

--- a/sys/man/1/zuke

+++ b/sys/man/1/zuke

@@ -130,6 +130,9 @@

 .B r

 Toggle ``repeat one''.

 .TP

+.B g

+Switch between no gain, track gain, and album gain applied.

+.TP

 .B s

 Toggle ``shuffle''.

 .TP

--- a/sys/src/cmd/audio/zuke/mkplist.c

+++ b/sys/src/cmd/audio/zuke/mkplist.c

@@ -122,6 +122,16 @@

 			aux->imagereader = f != nil;

 		}

 		break;

+	case Ttrackgain:

+		aux->rgtrack = atof(v);

+		if(strncmp(k, "R128_", 5) == 0)

+			aux->rgtrack /= 256.0;

+		break;

+	case Talbumgain:

+		aux->rgalbum = atof(v);

+		if(strncmp(k, "R128_", 5) == 0)

+			aux->rgalbum /= 256.0;

+		break;

 	}

 }

@@ -393,8 +403,8 @@

 			if(icyfill(m) != 0){

 				fprint(2, "%s: %r\n", argv[i]);

 				free(m);

-			}

-			sendp(cmeta, m);

+			}else

+				sendp(cmeta, m);

 		}else{

 			if(argv[i][0] == '/')

 				dir = strdup(argv[i]);

--- a/sys/src/cmd/audio/zuke/plist.c

+++ b/sys/src/cmd/audio/zuke/plist.c

@@ -21,6 +21,10 @@

 		Bprint(b, "%c %s\n", Ptrack, m->track);

 	if(m->duration > 0)

 		Bprint(b, "%c %llud\n", Pduration, m->duration);

+	if(m->rgtrack != 0.0)

+		Bprint(b, "%c %g\n", Prgtrack, m->rgtrack);

+	if(m->rgalbum != 0.0)

+		Bprint(b, "%c %g\n", Prgalbum, m->rgalbum);

 	if(m->imagesize > 0)

 		Bprint(b, "%c %d %d %d %s\n", Pimage, m->imageoffset, m->imagesize, m->imagereader, m->imagefmt);

 	Bprint(b, "\n");

--- a/sys/src/cmd/audio/zuke/plist.h

+++ b/sys/src/cmd/audio/zuke/plist.h

@@ -16,11 +16,13 @@

 	Pbasename=		'b',

 	Pdate=			'd',

 	Pduration=		'D',

+	Pfilefmt=		'f',

 	Pimage=			'i',

 	Ptitle=			't',

 	Ptrack=			'T',

 	Ppath=			'p',

-	Pfilefmt=		'f',

+	Prgtrack=		'r',

+	Prgalbum=		'R',

 	/* unused */

 	Pchannels=		'c',

@@ -42,6 +44,8 @@

 	char *basename;

 	char *imagefmt;

 	char *filefmt;

+	double rgtrack;

+	double rgalbum;

 	uvlong duration;

 	int numartist;

 	int imageoffset;

--- a/sys/src/cmd/audio/zuke/zuke.c

+++ b/sys/src/cmd/audio/zuke/zuke.c

@@ -24,6 +24,11 @@

 	Ctoggle,

 	Cseekrel,

+	Rgdisabled = 0,

+	Rgtrack,

+	Rgalbum,

+	Numrg,

+

 	Everror = 1,

 	Evready,

@@ -57,6 +62,7 @@

 	Channel *ev;

 	Channel *img;

 	double seek;

+	double gain;

 	int pcur;

 };

@@ -72,7 +78,7 @@

 static int debug;

 static int audio = -1;

-static int volume;

+static int volume, rg;

 static int pnotifies;

 static Playlist *pl;

 static Player *playernext;

@@ -276,10 +282,11 @@

 	Image *col;

 	/* seekbar playback/duration text */

-	i = snprint(tmp, sizeof(tmp), "%s%s%s",

+	i = snprint(tmp, sizeof(tmp), "%s%s%s%s",

+		rg ? (rg == Rgalbum ? "ᴬ" : "ᵀ") : "",

 		repeatone ? "¹" : "",

 		shuffle != nil ? "∫" : "",

-		(repeatone || shuffle != nil) ? " " : ""

+		(rg || repeatone || shuffle != nil) ? " " : ""

 	);

 	msec = 0;

 	if(pcurplaying >= 0){

@@ -605,6 +612,20 @@

 static void playerthread(void *player_);

+static void

+setgain(Player *player)

+{

+	if(player == nil)

+		return;

+	if(rg == Rgdisabled)

+		player->gain = 0.0;

+	if(rg == Rgtrack)

+		player->gain = getmeta(player->pcur)->rgtrack;

+	else if(rg == Rgalbum)

+		player->gain = getmeta(player->pcur)->rgalbum;

+	player->gain = pow(10.0, player->gain/20.0);

+}

+

 static Player *

 newplayer(int pcur, int loadnext)

 {

@@ -624,6 +645,7 @@

 	player->ctl = chancreate(sizeof(ulong), 0);

 	player->ev = chancreate(sizeof(ulong), 0);

 	player->pcur = pcur;

+	setgain(player);

 	threadcreate(playerthread, player, 32768);

 	if(getmeta(pcur)->filefmt[0] && playerret(player) < 0)

@@ -637,6 +659,18 @@

 }

 static void

+gain(double g, char *buf, long n)

+{

+	s16int *f;

+

+	if(g != 1.0)

+		for(f = (s16int*)buf; n >= 4; n -= 4){

+			*f = g * *f++;

+			*f = g * *f++;

+		}

+}

+

+static void

 playerthread(void *player_)

 {

 	char *buf, cmd[64], seekpos[12], *fmt;

@@ -718,6 +752,7 @@

 		if(n < 1)

 			goto next;

 		audioon();

+		gain(player->gain, buf, n);

 		boffset = iowrite(io, audio, buf, n);

 		noinit = 1;

 	}

@@ -767,6 +802,7 @@

 		boffset += n;

 		byteswritten = boffset;

 		audioon();

+		gain(player->gain, buf, n);

 		iowrite(io, audio, buf, n);

 		if(trycoverload){

 			trycoverload = 0;

@@ -930,6 +966,8 @@

 		case Pdate:    m->date = s; break;

 		case Ptitle:   m->title = s; break;

 		case Ptrack:   m->track = s; break;

+		case Prgtrack: m->rgtrack = atof(s); break;

+		case Prgalbum: m->rgalbum = atof(s); break;

 		case Ppath:

 			m->path = s;

 			m->basename = (b = utfrrune(s, '/')) == nil ? s : b+1;

@@ -1502,6 +1540,12 @@

 				freeimage(cover);

 				cover = nil;

 				full = 1;

+				break;

+			case 'g':

+				rg = (rg+1) % Numrg;

+				setgain(playercurr);

+				setgain(playernext);

+				redraw(0);

 				break;

 			case 's':

 				toggleshuffle();