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ebml: show mp3 tracks

--- a/common.h

+++ b/common.h

@@ -13,6 +13,7 @@

 	/* fake ones, not supposed to show up in a mp4 */

 	FmtVorbis = 0x766f7262u,

 	FmtSrt = 0x00737274u, /* srt subtitles */

+	FmtMp3 = 0x006d7033u,

 };

 typedef struct Ebml Ebml;

@@ -86,9 +87,12 @@

 int ebmlrun(Biobuf *f);

 u32int crc32(u32int init, u8int *d, ulong len);

+

 int ivfpacket(Biobuf *out, Packetctx *ctx, Packet *p, int np, uvlong ts);

 int oggpacket(Biobuf *out, Packetctx *ctx, Packet *p, int np, uvlong ts);

 int srtpacket(Biobuf *out, Packetctx *ctx, Packet *p, int np, uvlong ts);

+int mp3packet(Biobuf *out, Packetctx *ctx, Packet *p, int np, uvlong ts);

+

 int ebmlint(Biobuf *f, vlong *out, int isid);

 vlong ebmlel(Biobuf *f, vlong sz, vlong *id, vlong *esz);

 vlong ebmlrawint(Biobuf *f, vlong sz, vlong *dst);

--- a/ebml.c

+++ b/ebml.c

@@ -139,6 +139,9 @@

 	if(e->tracktype == 17){

 		if(strcmp(e->codec.name, "S_TEXT/UTF8") == 0)

 			return "srt";

+	}else if(e->tracktype == 2){

+		if(strcmp(e->codec.name, "A_MPEG/L3") == 0)

+			return "mp3";

 	}

 	n = snprint(t, sizeof(t), "%s", e->codec.name+2);

@@ -176,6 +179,11 @@

 		if(strcmp(c, "opus") == 0){

 			e->fmt = FmtOpus;

 			e->fpacket = oggpacket;

+			return 0;

+		}

+		if(strcmp(c, "mp3") == 0){

+			e->fmt = FmtMp3;

+			e->fpacket = mp3packet;

 			return 0;

 		}

 	}else if(e->tracktype == 17){

--- a/mkfile

+++ b/mkfile

@@ -11,6 +11,7 @@

 	iso.$O\

 	ivf.$O\

 	main.$O\

+	mp3.$O\

 	ogg.$O\

 	srt.$O\

--- /dev/null

+++ b/mp3.c

@@ -1,0 +1,12 @@

+#include <u.h>

+#include <libc.h>

+#include <bio.h>

+#include "common.h"

+

+int

+mp3packet(Biobuf *out, Packetctx *ctx, Packet *p, int np, uvlong ts)

+{

+	USED(out, ctx, p, np, ts);

+	werrstr("mp3packet not implemented");

+	return -1;

+}