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1 /* | 1 /* |
2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 4 * Use of this source code is governed by a BSD-style license |
5 * that can be found in the LICENSE file in the root of the source | 5 * that can be found in the LICENSE file in the root of the source |
6 * tree. An additional intellectual property rights grant can be found | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
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31 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 31 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
32 // 4 | Unused = 0 | | 32 // 4 | Unused = 0 | |
33 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 33 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
34 // 8 | Unique identifier 'R' 'E' 'M' 'B' | | 34 // 8 | Unique identifier 'R' 'E' 'M' 'B' | |
35 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 35 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
36 // 12 | Num SSRC | BR Exp | BR Mantissa | | 36 // 12 | Num SSRC | BR Exp | BR Mantissa | |
37 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 37 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
38 // 16 | SSRC feedback | | 38 // 16 | SSRC feedback | |
39 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 39 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
40 // : ... : | 40 // : ... : |
| 41 |
| 42 Remb::Remb() : bitrate_bps_(0) {} |
| 43 |
| 44 Remb::~Remb() = default; |
| 45 |
41 bool Remb::Parse(const CommonHeader& packet) { | 46 bool Remb::Parse(const CommonHeader& packet) { |
42 RTC_DCHECK(packet.type() == kPacketType); | 47 RTC_DCHECK(packet.type() == kPacketType); |
43 RTC_DCHECK_EQ(packet.fmt(), kFeedbackMessageType); | 48 RTC_DCHECK_EQ(packet.fmt(), kFeedbackMessageType); |
44 | 49 |
45 if (packet.payload_size_bytes() < 16) { | 50 if (packet.payload_size_bytes() < 16) { |
46 LOG(LS_WARNING) << "Payload length " << packet.payload_size_bytes() | 51 LOG(LS_WARNING) << "Payload length " << packet.payload_size_bytes() |
47 << " is too small for Remb packet."; | 52 << " is too small for Remb packet."; |
48 return false; | 53 return false; |
49 } | 54 } |
50 const uint8_t* const payload = packet.payload(); | 55 const uint8_t* const payload = packet.payload(); |
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85 | 90 |
86 bool Remb::SetSsrcs(std::vector<uint32_t> ssrcs) { | 91 bool Remb::SetSsrcs(std::vector<uint32_t> ssrcs) { |
87 if (ssrcs.size() > kMaxNumberOfSsrcs) { | 92 if (ssrcs.size() > kMaxNumberOfSsrcs) { |
88 LOG(LS_WARNING) << "Not enough space for all given SSRCs."; | 93 LOG(LS_WARNING) << "Not enough space for all given SSRCs."; |
89 return false; | 94 return false; |
90 } | 95 } |
91 ssrcs_ = std::move(ssrcs); | 96 ssrcs_ = std::move(ssrcs); |
92 return true; | 97 return true; |
93 } | 98 } |
94 | 99 |
| 100 size_t Remb::BlockLength() const { |
| 101 return kHeaderLength + kCommonFeedbackLength + (2 + ssrcs_.size()) * 4; |
| 102 } |
| 103 |
95 bool Remb::Create(uint8_t* packet, | 104 bool Remb::Create(uint8_t* packet, |
96 size_t* index, | 105 size_t* index, |
97 size_t max_length, | 106 size_t max_length, |
98 RtcpPacket::PacketReadyCallback* callback) const { | 107 RtcpPacket::PacketReadyCallback* callback) const { |
99 while (*index + BlockLength() > max_length) { | 108 while (*index + BlockLength() > max_length) { |
100 if (!OnBufferFull(packet, index, callback)) | 109 if (!OnBufferFull(packet, index, callback)) |
101 return false; | 110 return false; |
102 } | 111 } |
103 size_t index_end = *index + BlockLength(); | 112 size_t index_end = *index + BlockLength(); |
104 CreateHeader(kFeedbackMessageType, kPacketType, HeaderLength(), packet, | 113 CreateHeader(kFeedbackMessageType, kPacketType, HeaderLength(), packet, |
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123 | 132 |
124 for (uint32_t ssrc : ssrcs_) { | 133 for (uint32_t ssrc : ssrcs_) { |
125 ByteWriter<uint32_t>::WriteBigEndian(packet + *index, ssrc); | 134 ByteWriter<uint32_t>::WriteBigEndian(packet + *index, ssrc); |
126 *index += sizeof(uint32_t); | 135 *index += sizeof(uint32_t); |
127 } | 136 } |
128 RTC_DCHECK_EQ(index_end, *index); | 137 RTC_DCHECK_EQ(index_end, *index); |
129 return true; | 138 return true; |
130 } | 139 } |
131 } // namespace rtcp | 140 } // namespace rtcp |
132 } // namespace webrtc | 141 } // namespace webrtc |
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