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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_receiver/rtp_parser/test/rtp_packet_builder.h" | |
6 | |
7 #include "base/big_endian.h" | |
8 #include "base/logging.h" | |
9 | |
10 namespace media { | |
11 namespace cast { | |
12 | |
13 const uint32 kCastRtpHeaderLength = 7; | |
14 const uint32 kGenericRtpHeaderLength = 12; | |
15 static const uint8 kRtpMarkerBitMask = 0x80; | |
16 | |
17 RtpPacketBuilder::RtpPacketBuilder() | |
18 : is_key_(false), | |
19 frame_id_(0), | |
20 packet_id_(0), | |
21 max_packet_id_(0), | |
22 reference_frame_id_(0), | |
23 timestamp_(0), | |
24 sequence_number_(0), | |
25 marker_(false), | |
26 payload_type_(0), | |
27 ssrc_(0) {} | |
28 | |
29 void RtpPacketBuilder::SetKeyFrame(bool is_key) { is_key_ = is_key; } | |
30 | |
31 void RtpPacketBuilder::SetFrameIds(uint32 frame_id, uint32 reference_frame_id) { | |
32 frame_id_ = frame_id; | |
33 reference_frame_id_ = reference_frame_id; | |
34 } | |
35 | |
36 void RtpPacketBuilder::SetPacketId(uint16 packet_id) { packet_id_ = packet_id; } | |
37 | |
38 void RtpPacketBuilder::SetMaxPacketId(uint16 max_packet_id) { | |
39 max_packet_id_ = max_packet_id; | |
40 } | |
41 | |
42 void RtpPacketBuilder::SetTimestamp(uint32 timestamp) { | |
43 timestamp_ = timestamp; | |
44 } | |
45 | |
46 void RtpPacketBuilder::SetSequenceNumber(uint16 sequence_number) { | |
47 sequence_number_ = sequence_number; | |
48 } | |
49 | |
50 void RtpPacketBuilder::SetMarkerBit(bool marker) { marker_ = marker; } | |
51 | |
52 void RtpPacketBuilder::SetPayloadType(int payload_type) { | |
53 payload_type_ = payload_type; | |
54 } | |
55 | |
56 void RtpPacketBuilder::SetSsrc(uint32 ssrc) { ssrc_ = ssrc; } | |
57 | |
58 void RtpPacketBuilder::BuildHeader(uint8* data, uint32 data_length) { | |
59 BuildCommonHeader(data, data_length); | |
60 BuildCastHeader(data + kGenericRtpHeaderLength, | |
61 data_length - kGenericRtpHeaderLength); | |
62 } | |
63 | |
64 void RtpPacketBuilder::BuildCastHeader(uint8* data, uint32 data_length) { | |
65 // Build header. | |
66 DCHECK_LE(kCastRtpHeaderLength, data_length); | |
67 // Set the first 7 bytes to 0. | |
68 memset(data, 0, kCastRtpHeaderLength); | |
69 base::BigEndianWriter big_endian_writer(reinterpret_cast<char*>(data), 56); | |
70 const bool includes_specific_frame_reference = | |
71 (is_key_ && (reference_frame_id_ != frame_id_)) || | |
72 (!is_key_ && (reference_frame_id_ != (frame_id_ - 1))); | |
73 big_endian_writer.WriteU8((is_key_ ? 0x80 : 0) | | |
74 (includes_specific_frame_reference ? 0x40 : 0)); | |
75 big_endian_writer.WriteU8(frame_id_); | |
76 big_endian_writer.WriteU16(packet_id_); | |
77 big_endian_writer.WriteU16(max_packet_id_); | |
78 if (includes_specific_frame_reference) { | |
79 big_endian_writer.WriteU8(reference_frame_id_); | |
80 } | |
81 } | |
82 | |
83 void RtpPacketBuilder::BuildCommonHeader(uint8* data, uint32 data_length) { | |
84 DCHECK_LE(kGenericRtpHeaderLength, data_length); | |
85 base::BigEndianWriter big_endian_writer(reinterpret_cast<char*>(data), 96); | |
86 big_endian_writer.WriteU8(0x80); | |
87 big_endian_writer.WriteU8(payload_type_ | (marker_ ? kRtpMarkerBitMask : 0)); | |
88 big_endian_writer.WriteU16(sequence_number_); | |
89 big_endian_writer.WriteU32(timestamp_); | |
90 big_endian_writer.WriteU32(ssrc_); | |
91 } | |
92 | |
93 } // namespace cast | |
94 } // namespace media | |
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