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e40468ba3d
Specifically, I'm moving safe_compare.h safe_conversions.h safe_minmax.h They shouldn't be part of the API, and moving them to an appropriate subdirectory of rtc_base/ is a good way to keep track of that. BUG=webrtc:8445 Change-Id: I458531aeb30bcf4291c4bec3bf22a2fffbf054ff Reviewed-on: https://webrtc-review.googlesource.com/20860 Commit-Queue: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20829}
94 lines
3.6 KiB
C++
94 lines
3.6 KiB
C++
/*
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* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "modules/rtp_rtcp/source/rtcp_packet/dlrr.h"
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#include "modules/rtp_rtcp/source/byte_io.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/logging.h"
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#include "rtc_base/numerics/safe_conversions.h"
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namespace webrtc {
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namespace rtcp {
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// DLRR Report Block (RFC 3611).
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//
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// 0 1 2 3
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// 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
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | BT=5 | reserved | block length |
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// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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// | SSRC_1 (SSRC of first receiver) | sub-
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ block
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// | last RR (LRR) | 1
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | delay since last RR (DLRR) |
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// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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// | SSRC_2 (SSRC of second receiver) | sub-
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ block
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// : ... : 2
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Dlrr::Dlrr() = default;
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Dlrr::Dlrr(const Dlrr& other) = default;
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Dlrr::~Dlrr() = default;
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bool Dlrr::Parse(const uint8_t* buffer, uint16_t block_length_32bits) {
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RTC_DCHECK(buffer[0] == kBlockType);
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// kReserved = buffer[1];
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RTC_DCHECK_EQ(block_length_32bits,
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ByteReader<uint16_t>::ReadBigEndian(&buffer[2]));
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if (block_length_32bits % 3 != 0) {
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RTC_LOG(LS_WARNING) << "Invalid size for dlrr block.";
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return false;
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}
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size_t blocks_count = block_length_32bits / 3;
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const uint8_t* read_at = buffer + kBlockHeaderLength;
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sub_blocks_.resize(blocks_count);
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for (ReceiveTimeInfo& sub_block : sub_blocks_) {
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sub_block.ssrc = ByteReader<uint32_t>::ReadBigEndian(&read_at[0]);
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sub_block.last_rr = ByteReader<uint32_t>::ReadBigEndian(&read_at[4]);
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sub_block.delay_since_last_rr =
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ByteReader<uint32_t>::ReadBigEndian(&read_at[8]);
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read_at += kSubBlockLength;
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}
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return true;
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}
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size_t Dlrr::BlockLength() const {
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if (sub_blocks_.empty())
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return 0;
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return kBlockHeaderLength + kSubBlockLength * sub_blocks_.size();
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}
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void Dlrr::Create(uint8_t* buffer) const {
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if (sub_blocks_.empty()) // No subblocks, no need to write header either.
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return;
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// Create block header.
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const uint8_t kReserved = 0;
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buffer[0] = kBlockType;
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buffer[1] = kReserved;
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ByteWriter<uint16_t>::WriteBigEndian(
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&buffer[2], rtc::dchecked_cast<uint16_t>(3 * sub_blocks_.size()));
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// Create sub blocks.
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uint8_t* write_at = buffer + kBlockHeaderLength;
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for (const ReceiveTimeInfo& sub_block : sub_blocks_) {
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ByteWriter<uint32_t>::WriteBigEndian(&write_at[0], sub_block.ssrc);
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ByteWriter<uint32_t>::WriteBigEndian(&write_at[4], sub_block.last_rr);
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ByteWriter<uint32_t>::WriteBigEndian(&write_at[8],
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sub_block.delay_since_last_rr);
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write_at += kSubBlockLength;
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}
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RTC_DCHECK_EQ(buffer + BlockLength(), write_at);
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}
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} // namespace rtcp
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} // namespace webrtc
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