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ebml/ogg: use discard padding, codec delay and seek preroll to calculate granule position

--- a/common.h

+++ b/common.h

@@ -27,6 +27,8 @@

 struct Packetctx {

 	uvlong frid;

 	uvlong duration;

+	uvlong seekpreroll;

+	vlong discardpad;

 	struct {

 		char name[16];

 		vlong delay;

@@ -62,7 +64,6 @@

 	packet_f fpacket;

 	vlong timestampscale;

-	vlong seekpreroll;

 	vlong perframe;

 	int tracknum;

 	int tracktype;

--- a/ebml.c

+++ b/ebml.c

@@ -242,9 +242,8 @@

 {

 	int isebml, npackets, i;

 	vlong left, id, n, sz, bufsz, track, off, packetsz, x;

-	uvlong ts;

+	uvlong ts, timestamp, endtracks, timestampscale;

 	uchar *buf;

-	vlong timestamp, endtracks, timestampscale;

 	double duration;

 	Ebml e, te;

@@ -401,7 +400,7 @@

 				}

 				/* ns timestamp */

-				ts = (timestamp + (s16int)(buf[0]<<8 | buf[1])) * timestampscale;

+				ts = (timestamp + (s16int)(buf[0]<<8 | buf[1])) * timestampscale - te.codec.delay;

 				if(te.fpacket(&out, &te, packets, npackets, ts) != 0)

 					goto err;

 				continue;

@@ -454,6 +453,8 @@

 				ebmlgetfloat(0x4489, duration)

 			else

 				ebmlgetnumber(0x73c5, e.trackuid)

+			else

+				ebmlgetnumber(0x75a2, te.discardpad)

 			//else

 			//	ebmlgetnumber(0x9b, blockdur)

 		}

--- a/ogg.c

+++ b/ogg.c

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

 	if(Bwrite(out, h, ntot) != ntot)

 		return -1;

 	for(ip = 0; ip < np; ip++){

+		fprint(2, "%d %.*H\n", ip, min(8, p[ip].sz), p[ip].data);

 		if(Bwrite(out, p[ip].data, p[ip].sz) != p[ip].sz)

 			return -1;

 	}

@@ -80,8 +81,7 @@

 	int sgszs[4];

 	Packet onep;

-	if(ctx->fmt == FmtOpus)

-		ts += 80000000; /* pre-skip */

+	ts += ctx->seekpreroll - ctx->discardpad;

 	gr = (ts * 48) / 1000000;

 	r = 0;

@@ -137,7 +137,7 @@

 			goto err;

 	}

-	if(np > 0 && packet(out, ctx, 0, p, np, gr) != 0)

+	if(np > 0 && packet(out, ctx, ctx->discardpad ? 4 : 0, p, np, gr) != 0)

 		goto err;

 	return 0;