streaming

commit bc72cfd4e08026c5399b8e62231a837b517737b2
parent 386a8f0c0352952344a54b7cb170ee67d693b2be
Author: Oliver Lowe <o@olowe.co>
Date:   Fri, 10 May 2024 17:07:28 +1000

internal/scte35: finish first working splice info decode

Only set CW Index when we're meant to (when packet is encrypted), and
extract the 12-bit tier value correctly; before we were setting a
whole uint16.

Diffstat:
M
internal/scte35/splice_info.go
 | 
6
++++--

1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/internal/scte35/splice_info.go b/internal/scte35/splice_info.go
@@ -167,13 +167,15 @@ func decodeSpliceInfo(buf []byte) (*SpliceInfo, error) {
 	pts[4] = buf[5]
 	info.PTSAdjustment = binary.BigEndian.Uint64(pts)
 
-	info.CWIndex = uint8(buf[6])
+	if info.Encrypted {
+		info.CWIndex = uint8(buf[6])
+	}
 
 	// want left-most 12 bits, remaining is used by command length.
 	// TODO(otl): still not getting expected values here;
 	// check TestDecodeSpliceInfo
 	tier := binary.BigEndian.Uint16([]byte{buf[7], buf[8] & 0xf0})
-	info.Tier = tier
+	info.Tier = tier >> 4
 
 	// 4-bits out of buf[8], then all of buf[9] for a 12-bit integer.
 	cmdlen := binary.BigEndian.Uint16([]byte{buf[8] & 0x0f, buf[9]})