code: plan9front

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file: recognize and differentiate opus

--- a/sys/src/cmd/file.c

+++ b/sys/src/cmd/file.c

@@ -153,6 +153,8 @@

 int	istga(void);

 int	ismp3(void);

 int	ismp4(void);

+int	isoggvorbis(void);

+int	isoggopus(void);

 int	ismung(void);

 int	isp9bit(void);

 int	isp9font(void);

@@ -203,6 +205,8 @@

 	isicocur,		/* windows icon or cursor file */

 	isface,		/* ascii face file */

 	istga,

+	isoggvorbis,

+	isoggopus,

 	ismp4,

 	ismp3,

@@ -874,7 +878,6 @@

 	"\033%-12345X",		"HPJCL file",		9,	"application/hpjcl",

 	"\033Lua",		"Lua bytecode",		4,	OCTET,

 	"ID3",			"mp3 audio with id3",	3,	"audio/mpeg",

-	"OggS",			"ogg audio",		4,	"audio/ogg",

 	".snd",			"sun audio",		4,	"audio/basic",

 	"\211PNG",		"PNG image",		4,	"image/png",

 	"P1\n",			"ppm",			3,	"image/ppm",

@@ -1299,6 +1302,28 @@

 		return 1;

 	}

 	return 0;

+}

+

+int

+isoggvorbis(void)

+{

+	if(memcmp(&buf[0], "OggS", 4) != 0)

+		return 0;

+	if(memcmp(&buf[29], "vorbis", 6) != 0)

+		return 0;

+	print("%s\n", mime ? "audio/ogg;codecs=vorbis" : "ogg audio");

+	return 1;

+}

+

+int

+isoggopus(void)

+{

+	if(memcmp(&buf[0], "OggS", 4) != 0)

+		return 0;

+	if(memcmp(&buf[28], "OpusHead", 8) != 0)

+		return 0;

+	print("%s\n", mime ? "audio/ogg;codecs=opus" : "ogg audio");

+	return 1;

 }

 /*