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/*
* Copyright (c) 2016 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.
*/
#ifndef MODULES_RTP_RTCP_SOURCE_RTP_HEADER_EXTENSIONS_H_
#define MODULES_RTP_RTCP_SOURCE_RTP_HEADER_EXTENSIONS_H_
#include <stddef.h>
#include <stdint.h>
#include <cstdint>
#include <string>
#include <vector>
#include "absl/strings/string_view.h"
#include "api/array_view.h"
#include "api/rtp_headers.h"
#include "api/rtp_parameters.h"
#include "api/units/timestamp.h"
#include "api/video/color_space.h"
#include "api/video/video_content_type.h"
#include "api/video/video_rotation.h"
#include "api/video/video_timing.h"
#include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
namespace webrtc {
class AbsoluteSendTime {
public:
using value_type = uint32_t;
static constexpr RTPExtensionType kId = kRtpExtensionAbsoluteSendTime;
static constexpr uint8_t kValueSizeBytes = 3;
static constexpr absl::string_view Uri() {
return RtpExtension::kAbsSendTimeUri;
}
static bool Parse(rtc::ArrayView<const uint8_t> data, uint32_t* time_24bits);
static size_t ValueSize(uint32_t time_24bits) { return kValueSizeBytes; }
static bool Write(rtc::ArrayView<uint8_t> data, uint32_t time_24bits);
static constexpr uint32_t To24Bits(Timestamp time) {
int64_t time_us = time.us() % (int64_t{1 << 6} * 1'000'000);
int64_t time6x18 = (time_us << 18) / 1'000'000;
RTC_DCHECK_GE(time6x18, 0);
RTC_DCHECK_LT(time6x18, 1 << 24);
return static_cast<uint32_t>(time6x18);
}
static constexpr Timestamp ToTimestamp(uint32_t time_24bits) {
RTC_DCHECK_LT(time_24bits, (1 << 24));
return Timestamp::Micros((time_24bits* int64_t{1'000'000}) >> 18);
}
};
class AbsoluteCaptureTimeExtension {
public:
using value_type = AbsoluteCaptureTime;
static constexpr RTPExtensionType kId = kRtpExtensionAbsoluteCaptureTime;
static constexpr uint8_t kValueSizeBytes = 16;
static constexpr uint8_t kValueSizeBytesWithoutEstimatedCaptureClockOffset =
8;
static constexpr absl::string_view Uri() {
return RtpExtension::kAbsoluteCaptureTimeUri;
}
static bool Parse(rtc::ArrayView<const uint8_t> data,
AbsoluteCaptureTime* extension);
static size_t ValueSize(const AbsoluteCaptureTime& extension);
static bool Write(rtc::ArrayView<uint8_t> data,
const AbsoluteCaptureTime& extension);
};
class AudioLevel {
public:
static constexpr RTPExtensionType kId = kRtpExtensionAudioLevel;
static constexpr uint8_t kValueSizeBytes = 1;
static constexpr absl::string_view Uri() {
return RtpExtension::kAudioLevelUri;
}
static bool Parse(rtc::ArrayView<const uint8_t> data,
bool* voice_activity,
uint8_t* audio_level);
static size_t ValueSize(bool voice_activity, uint8_t audio_level) {
return kValueSizeBytes;
}
static bool Write(rtc::ArrayView<uint8_t> data,
bool voice_activity,
uint8_t audio_level);
};
class CsrcAudioLevel {
public:
static constexpr RTPExtensionType kId = kRtpExtensionCsrcAudioLevel;
static constexpr uint8_t kMaxValueSizeBytes = 15;
static constexpr absl::string_view Uri() {
return RtpExtension::kCsrcAudioLevelsUri;
}
static bool Parse(rtc::ArrayView<const uint8_t> data,
std::vector<uint8_t>* csrc_audio_levels);
static size_t ValueSize(rtc::ArrayView<const uint8_t> csrc_audio_levels);
static bool Write(rtc::ArrayView<uint8_t> data,
rtc::ArrayView<const uint8_t> csrc_audio_levels);
};
class TransmissionOffset {
public:
using value_type = int32_t;
static constexpr RTPExtensionType kId = kRtpExtensionTransmissionTimeOffset;
static constexpr uint8_t kValueSizeBytes = 3;
static constexpr absl::string_view Uri() {
return RtpExtension::kTimestampOffsetUri;
}
static bool Parse(rtc::ArrayView<const uint8_t> data, int32_t* rtp_time);
static size_t ValueSize(int32_t rtp_time) { return kValueSizeBytes; }
static bool Write(rtc::ArrayView<uint8_t> data, int32_t rtp_time);
};
class TransportSequenceNumber {
public:
using value_type = uint16_t;
static constexpr RTPExtensionType kId = kRtpExtensionTransportSequenceNumber;
static constexpr uint8_t kValueSizeBytes = 2;
static constexpr absl::string_view Uri() {
return RtpExtension::kTransportSequenceNumberUri;
}
static bool Parse(rtc::ArrayView<const uint8_t> data,
uint16_t* transport_sequence_number);
static size_t ValueSize(uint16_t /*transport_sequence_number*/) {
return kValueSizeBytes;
}
static bool Write(rtc::ArrayView<uint8_t> data,
uint16_t transport_sequence_number);
};
class TransportSequenceNumberV2 {
public:
static constexpr RTPExtensionType kId =
kRtpExtensionTransportSequenceNumber02;
static constexpr uint8_t kValueSizeBytes = 4;
static constexpr uint8_t kValueSizeBytesWithoutFeedbackRequest = 2;
static constexpr absl::string_view Uri() {
return RtpExtension::kTransportSequenceNumberV2Uri;
}
static bool Parse(rtc::ArrayView<const uint8_t> data,
uint16_t* transport_sequence_number,
absl::optional<FeedbackRequest>* feedback_request);
static size_t ValueSize(
uint16_t /*transport_sequence_number*/,
const absl::optional<FeedbackRequest>& feedback_request) {
return feedback_request ? kValueSizeBytes
: kValueSizeBytesWithoutFeedbackRequest;
}
static bool Write(rtc::ArrayView<uint8_t> data,
uint16_t transport_sequence_number,
const absl::optional<FeedbackRequest>& feedback_request);
private:
static constexpr uint16_t kIncludeTimestampsBit = 1 << 15;
};
class VideoOrientation {
public:
using value_type = VideoRotation;
static constexpr RTPExtensionType kId = kRtpExtensionVideoRotation;
static constexpr uint8_t kValueSizeBytes = 1;
static constexpr absl::string_view Uri() {
return RtpExtension::kVideoRotationUri;
}
static bool Parse(rtc::ArrayView<const uint8_t> data, VideoRotation* value);
static size_t ValueSize(VideoRotation) { return kValueSizeBytes; }
static bool Write(rtc::ArrayView<uint8_t> data, VideoRotation value);
static bool Parse(rtc::ArrayView<const uint8_t> data, uint8_t* value);
static size_t ValueSize(uint8_t value) { return kValueSizeBytes; }
static bool Write(rtc::ArrayView<uint8_t> data, uint8_t value);
};
class PlayoutDelayLimits {
public:
using value_type = VideoPlayoutDelay;
static constexpr RTPExtensionType kId = kRtpExtensionPlayoutDelay;
static constexpr uint8_t kValueSizeBytes = 3;
static constexpr absl::string_view Uri() {
return RtpExtension::kPlayoutDelayUri;
}
// Playout delay in milliseconds. A playout delay limit (min or max)
// has 12 bits allocated. This allows a range of 0-4095 values which
// translates to a range of 0-40950 in milliseconds.
static constexpr int kGranularityMs = 10;
// Maximum playout delay value in milliseconds.
static constexpr int kMaxMs = 0xfff * kGranularityMs; // 40950.
static bool Parse(rtc::ArrayView<const uint8_t> data,
VideoPlayoutDelay* playout_delay);
static size_t ValueSize(const VideoPlayoutDelay&) { return kValueSizeBytes; }
static bool Write(rtc::ArrayView<uint8_t> data,
const VideoPlayoutDelay& playout_delay);
};
class VideoContentTypeExtension {
public:
using value_type = VideoContentType;
static constexpr RTPExtensionType kId = kRtpExtensionVideoContentType;
static constexpr uint8_t kValueSizeBytes = 1;
static constexpr absl::string_view Uri() {
return RtpExtension::kVideoContentTypeUri;
}
static bool Parse(rtc::ArrayView<const uint8_t> data,
VideoContentType* content_type);
static size_t ValueSize(VideoContentType) { return kValueSizeBytes; }
static bool Write(rtc::ArrayView<uint8_t> data,
VideoContentType content_type);
};
class VideoTimingExtension {
public:
using value_type = VideoSendTiming;
static constexpr RTPExtensionType kId = kRtpExtensionVideoTiming;
static constexpr uint8_t kValueSizeBytes = 13;
static constexpr absl::string_view Uri() {
return RtpExtension::kVideoTimingUri;
}
// Offsets of the fields in the RTP header extension, counting from the first
// byte after the one-byte header.
static constexpr uint8_t kFlagsOffset = 0;
static constexpr uint8_t kEncodeStartDeltaOffset = 1;
static constexpr uint8_t kEncodeFinishDeltaOffset = 3;
static constexpr uint8_t kPacketizationFinishDeltaOffset = 5;
static constexpr uint8_t kPacerExitDeltaOffset = 7;
static constexpr uint8_t kNetworkTimestampDeltaOffset = 9;
static constexpr uint8_t kNetwork2TimestampDeltaOffset = 11;
static bool Parse(rtc::ArrayView<const uint8_t> data,
VideoSendTiming* timing);
static size_t ValueSize(const VideoSendTiming&) { return kValueSizeBytes; }
static bool Write(rtc::ArrayView<uint8_t> data,
const VideoSendTiming& timing);
static size_t ValueSize(uint16_t time_delta_ms, uint8_t idx) {
return kValueSizeBytes;
}
// Writes only single time delta to position idx.
static bool Write(rtc::ArrayView<uint8_t> data,
uint16_t time_delta_ms,
uint8_t offset);
};
class ColorSpaceExtension {
public:
using value_type = ColorSpace;
static constexpr RTPExtensionType kId = kRtpExtensionColorSpace;
static constexpr uint8_t kValueSizeBytes = 28;
static constexpr uint8_t kValueSizeBytesWithoutHdrMetadata = 4;
static constexpr absl::string_view Uri() {
return RtpExtension::kColorSpaceUri;
}
static bool Parse(rtc::ArrayView<const uint8_t> data,
ColorSpace* color_space);
static size_t ValueSize(const ColorSpace& color_space) {
return color_space.hdr_metadata() ? kValueSizeBytes
: kValueSizeBytesWithoutHdrMetadata;
}
static bool Write(rtc::ArrayView<uint8_t> data,
const ColorSpace& color_space);
private:
static constexpr int kChromaticityDenominator = 50000; // 0.00002 resolution.
static constexpr int kLuminanceMaxDenominator = 1; // 1 resolution.
static constexpr int kLuminanceMinDenominator = 10000; // 0.0001 resolution.
static uint8_t CombineRangeAndChromaSiting(
ColorSpace::RangeID range,
ColorSpace::ChromaSiting chroma_siting_horizontal,
ColorSpace::ChromaSiting chroma_siting_vertical);
static size_t ParseHdrMetadata(rtc::ArrayView<const uint8_t> data,
HdrMetadata* hdr_metadata);
static size_t ParseChromaticity(const uint8_t* data,
HdrMasteringMetadata::Chromaticity* p);
static size_t ParseLuminance(const uint8_t* data, float* f, int denominator);
static size_t WriteHdrMetadata(rtc::ArrayView<uint8_t> data,
const HdrMetadata& hdr_metadata);
static size_t WriteChromaticity(uint8_t* data,
const HdrMasteringMetadata::Chromaticity& p);
static size_t WriteLuminance(uint8_t* data, float f, int denominator);
};
// Base extension class for RTP header extensions which are strings.
// Subclasses must defined kId and kUri static constexpr members.
class BaseRtpStringExtension {
public:
using value_type = std::string;
// String RTP header extensions are limited to 16 bytes because it is the
// maximum length that can be encoded with one-byte header extensions.
static constexpr uint8_t kMaxValueSizeBytes = 16;
static bool Parse(rtc::ArrayView<const uint8_t> data, std::string* str);
static size_t ValueSize(absl::string_view str) { return str.size(); }
static bool Write(rtc::ArrayView<uint8_t> data, absl::string_view str);
};
class RtpStreamId : public BaseRtpStringExtension {
public:
static constexpr RTPExtensionType kId = kRtpExtensionRtpStreamId;
static constexpr absl::string_view Uri() { return RtpExtension::kRidUri; }
};
class RepairedRtpStreamId : public BaseRtpStringExtension {
public:
static constexpr RTPExtensionType kId = kRtpExtensionRepairedRtpStreamId;
static constexpr absl::string_view Uri() {
return RtpExtension::kRepairedRidUri;
}
};
class RtpMid : public BaseRtpStringExtension {
public:
static constexpr RTPExtensionType kId = kRtpExtensionMid;
static constexpr absl::string_view Uri() { return RtpExtension::kMidUri; }
};
class InbandComfortNoiseExtension {
public:
using value_type = absl::optional<uint8_t>;
static constexpr RTPExtensionType kId = kRtpExtensionInbandComfortNoise;
static constexpr uint8_t kValueSizeBytes = 1;
static constexpr const char kUri[] =
"http://www.webrtc.org/experiments/rtp-hdrext/inband-cn";
static constexpr absl::string_view Uri() { return kUri; }
static bool Parse(rtc::ArrayView<const uint8_t> data,
absl::optional<uint8_t>* level);
static size_t ValueSize(absl::optional<uint8_t> level) {
return kValueSizeBytes;
}
static bool Write(rtc::ArrayView<uint8_t> data,
absl::optional<uint8_t> level);
};
class VideoFrameTrackingIdExtension {
public:
using value_type = uint16_t;
static constexpr RTPExtensionType kId = kRtpExtensionVideoFrameTrackingId;
static constexpr uint8_t kValueSizeBytes = 2;
static constexpr absl::string_view Uri() {
return RtpExtension::kVideoFrameTrackingIdUri;
}
static bool Parse(rtc::ArrayView<const uint8_t> data,
uint16_t* video_frame_tracking_id);
static size_t ValueSize(uint16_t /*video_frame_tracking_id*/) {
return kValueSizeBytes;
}
static bool Write(rtc::ArrayView<uint8_t> data,
uint16_t video_frame_tracking_id);
};
} // namespace webrtc
#endif // MODULES_RTP_RTCP_SOURCE_RTP_HEADER_EXTENSIONS_H_