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opusrtp: Add support for RTP extension headers

Properly calculate the header size when extension headers are used.

Signed-off-by: Mark Harris <mark.hsj@gmail.com>

--- a/src/opusrtp.c

+++ b/src/opusrtp.c

@@ -436,6 +436,12 @@

   rtp->ext = (packet[0] >> 4) & 1;

   rtp->cc = packet[0] & 7;

   rtp->header_size = 12 + 4 * rtp->cc;

+  if (rtp->ext == 1) {

+    uint16_t ext_length;

+    rtp->header_size += 4;

+    ext_length = rbe16(packet + rtp->header_size - 2);

+    rtp->header_size += ext_length * 4;

+  }

   rtp->payload_size = size - rtp->header_size;

   rtp->mark = (packet[1] >> 7) & 1;