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extract aac audio from mkv

--- /dev/null

+++ b/aac.c

@@ -1,0 +1,16 @@

+#include <u.h>

+#include <libc.h>

+#include <bio.h>

+#include "common.h"

+

+int

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

+{

+	int i;

+

+	USED(ctx); USED(ts);

+	for(i = 0; i < np; i++, p++)

+		Bwrite(out, p->data, p->sz);

+

+	return 0;

+}

--- a/common.h

+++ b/common.h

@@ -92,6 +92,7 @@

 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 aacpacket(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);

--- a/ebml.c

+++ b/ebml.c

@@ -191,24 +191,25 @@

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

 			e->fmt = FmtVorbis;

 			e->fpacket = oggpacket;

-			return 0;

-		}

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

+		}else if(strcmp(c, "opus") == 0){

 			e->fmt = FmtOpus;

 			e->fpacket = oggpacket;

-			return 0;

-		}

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

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

 			e->fmt = FmtMp3;

 			e->fpacket = mp3packet;

-			return 0;

-		}

+		}else if(strcmp(c, "aac") == 0){

+			e->fmt = FmtMp4a;

+			e->fpacket = aacpacket;

+		}else

+			goto err;

+		return 0;

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

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

 			e->fmt = FmtSrt;

 			e->fpacket = srtpacket;

-			return 0;

-		}

+		}else

+			goto err;

+		return 0;

 	}

 err:

--- a/ivf.c

+++ b/ivf.c

@@ -141,7 +141,7 @@

 			}

 		}

-		if(ivfframe(out, p[0].data, p[0].sz, ts, ctx->fmt == FmtAvc1) != 0)

+		if(ivfframe(out, p->data, p->sz, ts, ctx->fmt == FmtAvc1) != 0)

 			goto err;

 		ctx->frid++;

 	}

--- a/mkfile

+++ b/mkfile

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

 BIN=/$objtype/bin

 OFILES=\

+	aac.$O\

 	crc32.$O\

 	ebml.$O\

 	iso.$O\