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Add handling of the absolute send time header extension to the rtp_rtcp module.

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BUG=
R=asapersson@webrtc.org, stefan@webrtc.org, tina.legrand@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1480004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4041 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
solenberg@webrtc.org
2013-05-16 11:10:31 +00:00
parent 59a06670b5
commit 7ebbea14a9
7 changed files with 328 additions and 40 deletions
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21
webrtc/modules/rtp_rtcp/source/rtp_utility.cc
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@ -355,6 +355,9 @@ bool RTPHeaderParser::Parse(WebRtcRTPHeader& parsedPacket,
// is zero.
parsedPacket.extension.transmissionTimeOffset = 0;
// May not be present in packet.
parsedPacket.extension.absoluteSendTime = 0;
if (X) {
/* RTP header extension, RFC 3550.
0 1 2 3
@ -466,6 +469,24 @@ void RTPHeaderParser::ParseOneByteExtensionHeader(
// level=%u", ID, len, V, level);
break;
}
case kRtpExtensionAbsoluteSendTime: {
if (len != 2) {
WEBRTC_TRACE(kTraceWarning, kTraceRtpRtcp, -1,
"Incorrect absolute send time len: %d", len);
return;
}
// 0 1 2 3
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | ID | len=2 | absolute send time |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
uint32_t absoluteSendTime = *ptr++ << 16;
absoluteSendTime += *ptr++ << 8;
absoluteSendTime += *ptr++;
parsedPacket.extension.absoluteSendTime = absoluteSendTime;
break;
}
default: {
WEBRTC_TRACE(kTraceStream, kTraceRtpRtcp, -1,
"Extension type not implemented.");