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libtags: separate "album artist" key

--- a/sys/src/cmd/audio/libtags/id3v2.c

+++ b/sys/src/cmd/audio/libtags/id3v2.c

@@ -19,8 +19,10 @@

 	k++;

 	if(strcmp(k, "AL") == 0 || strcmp(k, "ALB") == 0)

 		txtcb(ctx, Talbum, k-1, v);

-	else if(strcmp(k, "PE1") == 0 || strcmp(k, "PE2") == 0 || strcmp(k, "P1") == 0 || strcmp(k, "P2") == 0)

+	else if(strcmp(k, "PE1") == 0 || strcmp(k, "P1") == 0)

 		txtcb(ctx, Tartist, k-1, v);

+	else if(strcmp(k, "PE2") == 0 || strcmp(k, "P2") == 0)

+		txtcb(ctx, Talbumartist, k-1, v);

 	else if(strcmp(k, "IT2") == 0 || strcmp(k, "T2") == 0)

 		txtcb(ctx, Ttitle, k-1, v);

 	else if(strcmp(k, "YE") == 0 || strcmp(k, "YER") == 0 || strcmp(k, "DRC") == 0)

--- a/sys/src/cmd/audio/libtags/m4a.c

+++ b/sys/src/cmd/audio/libtags/m4a.c

@@ -87,6 +87,8 @@

 			type = Talbum;

 		else if(memcmp(d, "\251ART", 4) == 0)

 			type = Tartist;

+		else if(memcmp(d, "aART", 4) == 0)

+			type = Talbumartist;

 		else if(memcmp(d, "\251gen", 4) == 0 || memcmp(d, "gnre", 4) == 0)

 			type = Tgenre;

 		else if(memcmp(d, "\251day", 4) == 0)

--- a/sys/src/cmd/audio/libtags/tags.h

+++ b/sys/src/cmd/audio/libtags/tags.h

@@ -20,6 +20,7 @@

 	Timage,

 	Tcomposer,

 	Tcomment,

+	Talbumartist,

 };

 /* GAIN note:

--- a/sys/src/cmd/audio/libtags/vorbis.c

+++ b/sys/src/cmd/audio/libtags/vorbis.c

@@ -22,6 +22,8 @@

 	{"genre", Tgenre},

 	{"composer", Tcomposer},

 	{"comment", Tcomment},

+	{"albumartist", Talbumartist},

+	{"album artist", Talbumartist}, // some legacy leftovers

 };

 void

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

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

@@ -24,6 +24,7 @@

 	[Timage] = "image",

 	[Tcomposer] = "composer",

 	[Tcomment] = "comment",

+	[Talbumartist] = "albumartist",

 };

 static int image;

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

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

@@ -79,11 +79,14 @@

 	switch(t){

 	case Tartist:

+	case Talbumartist:

 		if(aux->numartist < Maxartist){

 			iscomposer = strcmp(k, "TCM") == 0 || strcmp(k, "TCOM") == 0;

-			/* prefer lead performer/soloist, helps when TP2/TPE2 is the first one and is set to "VA" */

-			/* always put composer first, if available */

-			if(iscomposer || (!aux->keepfirstartist && (strcmp(k, "TP1") == 0 || strcmp(k, "TPE1") == 0))){

+			/* prefer lead performer/soloist, helps when TP2/TPE2

+			 * (album artist) is the first one and is set to "VA";

+			 * always put composer first, if available

+			 */

+			if(iscomposer || (!aux->keepfirstartist && t == Tartist)){

 				if(aux->numartist > 0)

 					aux->artist[aux->numartist] = aux->artist[aux->numartist-1];

 				aux->artist[0] = strdup(v);