Fix Ogg absolute sample number

audio/packetizer/ogg.go

@@ -8,11 +8,13 @@ import (
 )
 
 type OggPacketizer struct {
-	reader io.Reader
+	reader  io.Reader
+	samples int64
 }
 
 type OggPacket struct {
-	header struct {
+	sampleNumber int64
+	header       struct {
 		Capture                 [4]byte
 		Revision                byte
 		Flags                   byte
@@ -34,8 +36,7 @@ func (p *OggPacket) KeepMode() KeepMode {
 }
 
 func (p *OggPacket) GetSampleNumber() int64 {
-	//TODO
-	return p.header.AbsoluteGranulePosition
+	return p.sampleNumber
 }
 
 func (p *OggPacket) GetData() []byte {
@@ -76,5 +77,9 @@ func (o *OggPacketizer) GetPacket() Packet {
 		}
 	}
 
+	//use previous sample number instead
+	packet.sampleNumber = o.samples
+	o.samples = packet.header.AbsoluteGranulePosition
+
 	return packet
 }