media/cast/rtp_sender/rtp_packetizer/test/rtp_header_parser.cc - Issue 112133002: Cast:Moving netwrok sender related code to a designated folder

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Issue 112133002: Cast:Moving netwrok sender related code to a designated folder (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src

Patch Set: Created 7 years ago

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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.

4

5 #include "media/cast/rtp_sender/rtp_packetizer/test/rtp_header_parser.h"

6

7 #include <cstddef>

8

9 #include "net/base/big_endian.h"

10

11 namespace media {

12 namespace cast {

13

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;

18

19

20 RtpHeaderParser::RtpHeaderParser(const uint8* rtp_data,

21 size_t rtp_data_length)

22 : rtp_data_begin_(rtp_data),

23 length_(rtp_data_length) {}

24

25 RtpHeaderParser::~RtpHeaderParser() {}

26

27 bool RtpHeaderParser::Parse(RtpCastHeader* parsed_packet) const {

28 if (length_ < kRtpCommonHeaderLength + kRtpCastHeaderLength)

29 return false;

30 if (!ParseCommon(parsed_packet)) return false;

31 return ParseCast(parsed_packet);

32 }

33

34 bool RtpHeaderParser::ParseCommon(RtpCastHeader* parsed_packet) const {

35 const uint8 version = rtp_data_begin_[0] >> 6;

36 if (version != 2) {

37 return false;

38 }

39

40 const uint8 num_csrcs = rtp_data_begin_[0] & 0x0f;

41 const bool marker = ((rtp_data_begin_[1] & 0x80) == 0) ? false : true;

42 const uint8 payload_type = rtp_data_begin_[1] & 0x7f;

43 const uint16 sequence_number = (rtp_data_begin_[2] << 8) +

44 rtp_data_begin_[3];

45

46 const uint8* ptr = &rtp_data_begin_[4];

47

48 net::BigEndianReader big_endian_reader(ptr, 8);

49 uint32 rtp_timestamp, ssrc;

50 big_endian_reader.ReadU32(&rtp_timestamp);

51 big_endian_reader.ReadU32(&ssrc);

52

53 const uint8 csrc_octs = num_csrcs * 4;

54

55 parsed_packet->webrtc.header.markerBit = marker;

56 parsed_packet->webrtc.header.payloadType = payload_type;

57 parsed_packet->webrtc.header.sequenceNumber = sequence_number;

58 parsed_packet->webrtc.header.timestamp = rtp_timestamp;

59 parsed_packet->webrtc.header.ssrc = ssrc;

60 parsed_packet->webrtc.header.numCSRCs = num_csrcs;

61

62 parsed_packet->webrtc.type.Audio.numEnergy =

63 parsed_packet->webrtc.header.numCSRCs;

64

65 parsed_packet->webrtc.header.headerLength = 12 + csrc_octs;

66 return true;

67 }

68

69 bool RtpHeaderParser::ParseCast(RtpCastHeader* parsed_packet) const {

70 const uint8* data = rtp_data_begin_ + kRtpCommonHeaderLength;

71 parsed_packet->is_key_frame = (data[0] & kCastKeyFrameBitMask);

72 parsed_packet->is_reference = (data[0] & kCastReferenceFrameIdBitMask);

73 parsed_packet->frame_id = frame_id_wrap_helper_.MapTo32bitsFrameId(data[1]);

74

75 net::BigEndianReader big_endian_reader(data + 2, 8);

76 big_endian_reader.ReadU16(&parsed_packet->packet_id);

77 big_endian_reader.ReadU16(&parsed_packet->max_packet_id);

78

79 if (parsed_packet->is_reference) {

80 parsed_packet->reference_frame_id =

81 reference_frame_id_wrap_helper_.MapTo32bitsFrameId(data[6]);

82 }

83 return true;

84 }

85

86 } // namespace cast

87 } // namespace media

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