mirror of
https://github.com/mollyim/webrtc.git
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f0cc814343
Bug: None Change-Id: I17b9ba0eb8095cfd8e6bc5bf97b2949d5d3edd24 Reviewed-on: https://webrtc-review.googlesource.com/17500 Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20524}
385 lines
15 KiB
C++
385 lines
15 KiB
C++
/*
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* Copyright (c) 2016 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/rtp_header_extensions.h"
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#include "modules/rtp_rtcp/include/rtp_cvo.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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namespace webrtc {
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// Absolute send time in RTP streams.
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//
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// The absolute send time is signaled to the receiver in-band using the
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// general mechanism for RTP header extensions [RFC5285]. The payload
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// of this extension (the transmitted value) is a 24-bit unsigned integer
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// containing the sender's current time in seconds as a fixed point number
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// with 18 bits fractional part.
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//
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// The form of the absolute send time extension block:
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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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// | ID | len=2 | absolute send time |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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constexpr RTPExtensionType AbsoluteSendTime::kId;
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constexpr uint8_t AbsoluteSendTime::kValueSizeBytes;
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constexpr const char AbsoluteSendTime::kUri[];
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bool AbsoluteSendTime::Parse(rtc::ArrayView<const uint8_t> data,
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uint32_t* time_24bits) {
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if (data.size() != 3)
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return false;
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*time_24bits = ByteReader<uint32_t, 3>::ReadBigEndian(data.data());
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return true;
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}
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bool AbsoluteSendTime::Write(uint8_t* data, uint32_t time_24bits) {
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RTC_DCHECK_LE(time_24bits, 0x00FFFFFF);
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ByteWriter<uint32_t, 3>::WriteBigEndian(data, time_24bits);
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return true;
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}
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// An RTP Header Extension for Client-to-Mixer Audio Level Indication
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//
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// https://datatracker.ietf.org/doc/draft-lennox-avt-rtp-audio-level-exthdr/
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//
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// The form of the audio level extension block:
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//
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// 0 1
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | ID | len=0 |V| level |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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//
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constexpr RTPExtensionType AudioLevel::kId;
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constexpr uint8_t AudioLevel::kValueSizeBytes;
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constexpr const char AudioLevel::kUri[];
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bool AudioLevel::Parse(rtc::ArrayView<const uint8_t> data,
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bool* voice_activity,
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uint8_t* audio_level) {
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if (data.size() != 1)
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return false;
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*voice_activity = (data[0] & 0x80) != 0;
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*audio_level = data[0] & 0x7F;
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return true;
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}
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bool AudioLevel::Write(uint8_t* data,
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bool voice_activity,
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uint8_t audio_level) {
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RTC_CHECK_LE(audio_level, 0x7f);
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data[0] = (voice_activity ? 0x80 : 0x00) | audio_level;
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return true;
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}
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// From RFC 5450: Transmission Time Offsets in RTP Streams.
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//
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// The transmission time is signaled to the receiver in-band using the
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// general mechanism for RTP header extensions [RFC5285]. The payload
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// of this extension (the transmitted value) is a 24-bit signed integer.
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// When added to the RTP timestamp of the packet, it represents the
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// "effective" RTP transmission time of the packet, on the RTP
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// timescale.
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//
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// The form of the transmission offset extension block:
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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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// | ID | len=2 | transmission offset |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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constexpr RTPExtensionType TransmissionOffset::kId;
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constexpr uint8_t TransmissionOffset::kValueSizeBytes;
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constexpr const char TransmissionOffset::kUri[];
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bool TransmissionOffset::Parse(rtc::ArrayView<const uint8_t> data,
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int32_t* rtp_time) {
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if (data.size() != 3)
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return false;
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*rtp_time = ByteReader<int32_t, 3>::ReadBigEndian(data.data());
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return true;
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}
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bool TransmissionOffset::Write(uint8_t* data, int32_t rtp_time) {
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RTC_DCHECK_LE(rtp_time, 0x00ffffff);
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ByteWriter<int32_t, 3>::WriteBigEndian(data, rtp_time);
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return true;
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}
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// 0 1 2
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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
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | ID | L=1 |transport wide sequence number |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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constexpr RTPExtensionType TransportSequenceNumber::kId;
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constexpr uint8_t TransportSequenceNumber::kValueSizeBytes;
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constexpr const char TransportSequenceNumber::kUri[];
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bool TransportSequenceNumber::Parse(rtc::ArrayView<const uint8_t> data,
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uint16_t* value) {
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if (data.size() != 2)
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return false;
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*value = ByteReader<uint16_t>::ReadBigEndian(data.data());
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return true;
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}
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bool TransportSequenceNumber::Write(uint8_t* data, uint16_t value) {
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ByteWriter<uint16_t>::WriteBigEndian(data, value);
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return true;
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}
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// Coordination of Video Orientation in RTP streams.
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//
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// Coordination of Video Orientation consists in signaling of the current
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// orientation of the image captured on the sender side to the receiver for
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// appropriate rendering and displaying.
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//
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// 0 1
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | ID | len=0 |0 0 0 0 C F R R|
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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constexpr RTPExtensionType VideoOrientation::kId;
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constexpr uint8_t VideoOrientation::kValueSizeBytes;
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constexpr const char VideoOrientation::kUri[];
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bool VideoOrientation::Parse(rtc::ArrayView<const uint8_t> data,
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VideoRotation* rotation) {
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if (data.size() != 1)
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return false;
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*rotation = ConvertCVOByteToVideoRotation(data[0]);
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return true;
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}
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bool VideoOrientation::Write(uint8_t* data, VideoRotation rotation) {
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data[0] = ConvertVideoRotationToCVOByte(rotation);
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return true;
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}
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bool VideoOrientation::Parse(rtc::ArrayView<const uint8_t> data,
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uint8_t* value) {
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if (data.size() != 1)
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return false;
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*value = data[0];
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return true;
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}
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bool VideoOrientation::Write(uint8_t* data, uint8_t value) {
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data[0] = value;
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return true;
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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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// | ID | len=2 | MIN delay | MAX delay |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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constexpr RTPExtensionType PlayoutDelayLimits::kId;
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constexpr uint8_t PlayoutDelayLimits::kValueSizeBytes;
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constexpr const char PlayoutDelayLimits::kUri[];
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bool PlayoutDelayLimits::Parse(rtc::ArrayView<const uint8_t> data,
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PlayoutDelay* playout_delay) {
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RTC_DCHECK(playout_delay);
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if (data.size() != 3)
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return false;
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uint32_t raw = ByteReader<uint32_t, 3>::ReadBigEndian(data.data());
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uint16_t min_raw = (raw >> 12);
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uint16_t max_raw = (raw & 0xfff);
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if (min_raw > max_raw)
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return false;
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playout_delay->min_ms = min_raw * kGranularityMs;
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playout_delay->max_ms = max_raw * kGranularityMs;
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return true;
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}
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bool PlayoutDelayLimits::Write(uint8_t* data,
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const PlayoutDelay& playout_delay) {
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RTC_DCHECK_LE(0, playout_delay.min_ms);
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RTC_DCHECK_LE(playout_delay.min_ms, playout_delay.max_ms);
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RTC_DCHECK_LE(playout_delay.max_ms, kMaxMs);
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// Convert MS to value to be sent on extension header.
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uint32_t min_delay = playout_delay.min_ms / kGranularityMs;
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uint32_t max_delay = playout_delay.max_ms / kGranularityMs;
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ByteWriter<uint32_t, 3>::WriteBigEndian(data, (min_delay << 12) | max_delay);
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return true;
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}
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// Video Content Type.
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//
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// E.g. default video or screenshare.
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//
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// 0 1
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | ID | len=0 | Content type |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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constexpr RTPExtensionType VideoContentTypeExtension::kId;
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constexpr uint8_t VideoContentTypeExtension::kValueSizeBytes;
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constexpr const char VideoContentTypeExtension::kUri[];
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bool VideoContentTypeExtension::Parse(rtc::ArrayView<const uint8_t> data,
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VideoContentType* content_type) {
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if (data.size() == 1 &&
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videocontenttypehelpers::IsValidContentType(data[0])) {
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*content_type = static_cast<VideoContentType>(data[0]);
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return true;
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}
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return false;
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}
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bool VideoContentTypeExtension::Write(uint8_t* data,
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VideoContentType content_type) {
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data[0] = static_cast<uint8_t>(content_type);
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return true;
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}
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// Video Timing.
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// 6 timestamps in milliseconds counted from capture time stored in rtp header:
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// encode start/finish, packetization complete, pacer exit and reserved for
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// modification by the network modification. |flags| is a bitmask and has the
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// following allowed values:
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// 0 = Valid data, but no flags available (backwards compatibility)
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// 1 = Frame marked as timing frame due to cyclic timer.
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// 2 = Frame marked as timing frame due to size being outside limit.
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// 255 = Invalid. The whole timing frame extension should be ignored.
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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 2
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | ID | len=12| flags | encode start ms delta |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | encode finish ms delta | packetizer finish ms delta |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | pacer exit ms delta | network timestamp ms delta |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | network2 timestamp ms delta |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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constexpr RTPExtensionType VideoTimingExtension::kId;
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constexpr uint8_t VideoTimingExtension::kValueSizeBytes;
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constexpr const char VideoTimingExtension::kUri[];
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bool VideoTimingExtension::Parse(rtc::ArrayView<const uint8_t> data,
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VideoSendTiming* timing) {
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RTC_DCHECK(timing);
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// TODO(sprang): Deprecate support for old wire format.
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ptrdiff_t off = 0;
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switch (data.size()) {
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case kValueSizeBytes - 1:
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timing->flags = 0;
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off = 1; // Old wire format without the flags field.
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break;
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case kValueSizeBytes:
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timing->flags = ByteReader<uint8_t>::ReadBigEndian(data.data());
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break;
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default:
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return false;
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}
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timing->encode_start_delta_ms = ByteReader<uint16_t>::ReadBigEndian(
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data.data() + VideoSendTiming::kEncodeStartDeltaOffset - off);
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timing->encode_finish_delta_ms = ByteReader<uint16_t>::ReadBigEndian(
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data.data() + VideoSendTiming::kEncodeFinishDeltaOffset - off);
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timing->packetization_finish_delta_ms = ByteReader<uint16_t>::ReadBigEndian(
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data.data() + VideoSendTiming::kPacketizationFinishDeltaOffset - off);
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timing->pacer_exit_delta_ms = ByteReader<uint16_t>::ReadBigEndian(
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data.data() + VideoSendTiming::kPacerExitDeltaOffset - off);
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timing->network_timestamp_delta_ms = ByteReader<uint16_t>::ReadBigEndian(
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data.data() + VideoSendTiming::kNetworkTimestampDeltaOffset - off);
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timing->network2_timestamp_delta_ms = ByteReader<uint16_t>::ReadBigEndian(
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data.data() + VideoSendTiming::kNetwork2TimestampDeltaOffset - off);
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return true;
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}
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bool VideoTimingExtension::Write(uint8_t* data, const VideoSendTiming& timing) {
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ByteWriter<uint8_t>::WriteBigEndian(data + VideoSendTiming::kFlagsOffset,
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timing.flags);
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ByteWriter<uint16_t>::WriteBigEndian(
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data + VideoSendTiming::kEncodeStartDeltaOffset,
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timing.encode_start_delta_ms);
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ByteWriter<uint16_t>::WriteBigEndian(
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data + VideoSendTiming::kEncodeFinishDeltaOffset,
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timing.encode_finish_delta_ms);
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ByteWriter<uint16_t>::WriteBigEndian(
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data + VideoSendTiming::kPacketizationFinishDeltaOffset,
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timing.packetization_finish_delta_ms);
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ByteWriter<uint16_t>::WriteBigEndian(
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data + VideoSendTiming::kPacerExitDeltaOffset,
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timing.pacer_exit_delta_ms);
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ByteWriter<uint16_t>::WriteBigEndian(
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data + VideoSendTiming::kNetworkTimestampDeltaOffset,
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timing.network_timestamp_delta_ms);
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ByteWriter<uint16_t>::WriteBigEndian(
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data + VideoSendTiming::kNetwork2TimestampDeltaOffset,
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timing.network2_timestamp_delta_ms);
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return true;
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}
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bool VideoTimingExtension::Write(uint8_t* data,
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uint16_t time_delta_ms,
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uint8_t offset) {
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RTC_DCHECK_LE(offset, kValueSizeBytes - sizeof(uint16_t));
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ByteWriter<uint16_t>::WriteBigEndian(data + offset, time_delta_ms);
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return true;
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}
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bool BaseRtpStringExtension::Parse(rtc::ArrayView<const uint8_t> data,
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StringRtpHeaderExtension* str) {
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if (data.empty() || data[0] == 0) // Valid string extension can't be empty.
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return false;
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str->Set(data);
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RTC_DCHECK(!str->empty());
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return true;
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}
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bool BaseRtpStringExtension::Write(uint8_t* data,
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const StringRtpHeaderExtension& str) {
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RTC_DCHECK_GE(str.size(), 1);
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RTC_DCHECK_LE(str.size(), StringRtpHeaderExtension::kMaxSize);
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memcpy(data, str.data(), str.size());
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return true;
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}
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bool BaseRtpStringExtension::Parse(rtc::ArrayView<const uint8_t> data,
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std::string* str) {
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if (data.empty() || data[0] == 0) // Valid string extension can't be empty.
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return false;
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const char* cstr = reinterpret_cast<const char*>(data.data());
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// If there is a \0 character in the middle of the |data|, treat it as end
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// of the string. Well-formed string extensions shouldn't contain it.
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str->assign(cstr, strnlen(cstr, data.size()));
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RTC_DCHECK(!str->empty());
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return true;
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}
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bool BaseRtpStringExtension::Write(uint8_t* data, const std::string& str) {
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RTC_DCHECK_GE(str.size(), 1);
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RTC_DCHECK_LE(str.size(), StringRtpHeaderExtension::kMaxSize);
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memcpy(data, str.data(), str.size());
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return true;
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}
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// Constant declarations for string RTP header extension types.
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constexpr RTPExtensionType RtpStreamId::kId;
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constexpr const char RtpStreamId::kUri[];
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constexpr RTPExtensionType RepairedRtpStreamId::kId;
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constexpr const char RepairedRtpStreamId::kUri[];
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constexpr RTPExtensionType RtpMid::kId;
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constexpr const char RtpMid::kUri[];
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} // namespace webrtc
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