1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "media/cast/rtp_sender/rtp_packetizer/test/rtp_header_parser.h"
9 #include "net/base/big_endian.h"
14 static const uint8 kCastKeyFrameBitMask = 0x80;
15 static const uint8 kCastReferenceFrameIdBitMask = 0x40;
16 static const size_t kRtpCommonHeaderLength = 12;
17 static const size_t kRtpCastHeaderLength = 12;
20 RtpHeaderParser::RtpHeaderParser(const uint8* rtp_data,
21 size_t rtp_data_length)
22 : rtp_data_begin_(rtp_data),
23 length_(rtp_data_length) {}
25 RtpHeaderParser::~RtpHeaderParser() {}
27 bool RtpHeaderParser::Parse(RtpCastHeader* parsed_packet) const {
28 if (length_ < kRtpCommonHeaderLength + kRtpCastHeaderLength)
30 if (!ParseCommon(parsed_packet)) return false;
31 return ParseCast(parsed_packet);
34 bool RtpHeaderParser::ParseCommon(RtpCastHeader* parsed_packet) const {
35 const uint8 version = rtp_data_begin_[0] >> 6;
40 const uint8 num_csrcs = rtp_data_begin_[0] & 0x0f;
41 const bool marker = ((rtp_data_begin_[1] & 0x80) == 0) ? false : true;
43 const uint8 payload_type = rtp_data_begin_[1] & 0x7f;
45 const uint16 sequence_number = (rtp_data_begin_[2] << 8) +
48 const uint8* ptr = &rtp_data_begin_[4];
50 net::BigEndianReader big_endian_reader(ptr, 8);
51 uint32 rtp_timestamp, ssrc;
52 big_endian_reader.ReadU32(&rtp_timestamp);
53 big_endian_reader.ReadU32(&ssrc);
55 const uint8 csrc_octs = num_csrcs * 4;
57 parsed_packet->webrtc.header.markerBit = marker;
58 parsed_packet->webrtc.header.payloadType = payload_type;
59 parsed_packet->webrtc.header.sequenceNumber = sequence_number;
60 parsed_packet->webrtc.header.timestamp = rtp_timestamp;
61 parsed_packet->webrtc.header.ssrc = ssrc;
62 parsed_packet->webrtc.header.numCSRCs = num_csrcs;
64 parsed_packet->webrtc.type.Audio.numEnergy =
65 parsed_packet->webrtc.header.numCSRCs;
67 parsed_packet->webrtc.header.headerLength = 12 + csrc_octs;
71 bool RtpHeaderParser::ParseCast(RtpCastHeader* parsed_packet) const {
72 const uint8* data = rtp_data_begin_ + kRtpCommonHeaderLength;
73 parsed_packet->is_key_frame = (data[0] & kCastKeyFrameBitMask);
74 parsed_packet->is_reference = (data[0] & kCastReferenceFrameIdBitMask);
75 parsed_packet->frame_id = data[1];
77 net::BigEndianReader big_endian_reader(data + 2, 8);
78 big_endian_reader.ReadU16(&parsed_packet->packet_id);
79 big_endian_reader.ReadU16(&parsed_packet->max_packet_id);
81 if (parsed_packet->is_reference) {
82 parsed_packet->reference_frame_id = data[6];