af476c737f
There's no longer any need to make the two arguments have the same signedness, so we can drop the "u" suffix on literal integer arguments. NOPRESUBMIT=true BUG=webrtc:6645 Review-Url: https://codereview.webrtc.org/2535593002 Cr-Commit-Position: refs/heads/master@{#15280}
86 lines
2.9 KiB
C++
86 lines
2.9 KiB
C++
/*
|
|
* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
|
|
#include "webrtc/modules/rtp_rtcp/source/rtcp_packet.h"
|
|
|
|
#include "webrtc/base/checks.h"
|
|
|
|
namespace webrtc {
|
|
namespace rtcp {
|
|
constexpr size_t RtcpPacket::kHeaderLength;
|
|
|
|
rtc::Buffer RtcpPacket::Build() const {
|
|
rtc::Buffer packet(BlockLength());
|
|
|
|
size_t length = 0;
|
|
bool created = Create(packet.data(), &length, packet.capacity(), nullptr);
|
|
RTC_DCHECK(created) << "Invalid packet is not supported.";
|
|
RTC_DCHECK_EQ(length, packet.size())
|
|
<< "BlockLength mispredicted size used by Create";
|
|
|
|
return packet;
|
|
}
|
|
|
|
bool RtcpPacket::BuildExternalBuffer(uint8_t* buffer,
|
|
size_t max_length,
|
|
PacketReadyCallback* callback) const {
|
|
size_t index = 0;
|
|
if (!Create(buffer, &index, max_length, callback))
|
|
return false;
|
|
return OnBufferFull(buffer, &index, callback);
|
|
}
|
|
|
|
bool RtcpPacket::OnBufferFull(uint8_t* packet,
|
|
size_t* index,
|
|
PacketReadyCallback* callback) const {
|
|
if (*index == 0)
|
|
return false;
|
|
RTC_DCHECK(callback) << "Fragmentation not supported.";
|
|
callback->OnPacketReady(packet, *index);
|
|
*index = 0;
|
|
return true;
|
|
}
|
|
|
|
size_t RtcpPacket::HeaderLength() const {
|
|
size_t length_in_bytes = BlockLength();
|
|
RTC_DCHECK_GT(length_in_bytes, 0);
|
|
RTC_DCHECK_EQ(length_in_bytes % 4, 0) << "Padding not supported";
|
|
// Length in 32-bit words without common header.
|
|
return (length_in_bytes - kHeaderLength) / 4;
|
|
}
|
|
|
|
// From RFC 3550, RTP: A Transport Protocol for Real-Time Applications.
|
|
//
|
|
// RTP header format.
|
|
// 0 1 2 3
|
|
// 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
|
|
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
// |V=2|P| RC/FMT | PT | length |
|
|
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
void RtcpPacket::CreateHeader(
|
|
uint8_t count_or_format, // Depends on packet type.
|
|
uint8_t packet_type,
|
|
size_t length,
|
|
uint8_t* buffer,
|
|
size_t* pos) {
|
|
RTC_DCHECK_LE(length, 0xffffU);
|
|
RTC_DCHECK_LE(count_or_format, 0x1f);
|
|
constexpr uint8_t kVersionBits = 2 << 6;
|
|
constexpr uint8_t kNoPaddingBit = 0 << 5;
|
|
buffer[*pos + 0] = kVersionBits | kNoPaddingBit | count_or_format;
|
|
buffer[*pos + 1] = packet_type;
|
|
buffer[*pos + 2] = (length >> 8) & 0xff;
|
|
buffer[*pos + 3] = length & 0xff;
|
|
*pos += kHeaderLength;
|
|
}
|
|
|
|
} // namespace rtcp
|
|
} // namespace webrtc
|