blob: f7df4bbe4caf5d9536236145416f122c1a3e7346 [file] [log] [blame]
* Copyright (c) 2012 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 <map>
#include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"
#include "webrtc/typedefs.h"
namespace webrtc {
const uint16_t kRtpOneByteHeaderExtensionId = 0xBEDE;
const size_t kRtpOneByteHeaderLength = 4;
const size_t kTransmissionTimeOffsetLength = 4;
const size_t kAudioLevelLength = 2;
const size_t kAbsoluteSendTimeLength = 4;
const size_t kVideoRotationLength = 2;
const size_t kTransportSequenceNumberLength = 3;
const size_t kPlayoutDelayLength = 4;
// 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.
const int kPlayoutDelayGranularityMs = 10;
// Maximum playout delay value in milliseconds.
const int kPlayoutDelayMaxMs = 40950;
struct HeaderExtension {
explicit HeaderExtension(RTPExtensionType extension_type)
: type(extension_type), length(0), active(true) {
HeaderExtension(RTPExtensionType extension_type, bool active)
: type(extension_type), length(0), active(active) {
void Init() {
// TODO(solenberg): Create handler classes for header extensions so we can
// get rid of switches like these as well as handling code spread out all
// over.
switch (type) {
case kRtpExtensionTransmissionTimeOffset:
length = kTransmissionTimeOffsetLength;
case kRtpExtensionAudioLevel:
length = kAudioLevelLength;
case kRtpExtensionAbsoluteSendTime:
length = kAbsoluteSendTimeLength;
case kRtpExtensionVideoRotation:
length = kVideoRotationLength;
case kRtpExtensionTransportSequenceNumber:
length = kTransportSequenceNumberLength;
case kRtpExtensionPlayoutDelay:
length = kPlayoutDelayLength;
const RTPExtensionType type;
uint8_t length;
bool active;
class RtpHeaderExtensionMap {
static constexpr RTPExtensionType kInvalidType = kRtpExtensionNone;
static constexpr uint8_t kInvalidId = 0;
void Erase();
int32_t Register(const RTPExtensionType type, const uint8_t id);
// Active on an extension indicates whether it is currently being added on
// on the RTP packets. The active/inactive status on an extension can change
// dynamically depending on the need to convey new information.
int32_t RegisterInactive(const RTPExtensionType type, const uint8_t id);
bool SetActive(const RTPExtensionType type, bool active);
int32_t Deregister(const RTPExtensionType type);
bool IsRegistered(RTPExtensionType type) const;
int32_t GetType(const uint8_t id, RTPExtensionType* type) const;
// Return kInvalidType if not found.
RTPExtensionType GetType(uint8_t id) const;
int32_t GetId(const RTPExtensionType type, uint8_t* id) const;
// Return kInvalidId if not found.
uint8_t GetId(RTPExtensionType type) const;
// Methods below ignore any inactive rtp header extensions.
size_t GetTotalLengthInBytes() const;
int32_t GetLengthUntilBlockStartInBytes(const RTPExtensionType type) const;
void GetCopy(RtpHeaderExtensionMap* map) const;
int32_t Size() const;
RTPExtensionType First() const;
RTPExtensionType Next(RTPExtensionType type) const;
int32_t Register(const RTPExtensionType type, const uint8_t id, bool active);
std::map<uint8_t, HeaderExtension*> extensionMap_;
} // namespace webrtc