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/*
* 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.
*/
#ifndef WEBRTC_MODULES_RTP_RTCP_RTP_HEADER_EXTENSION_H_
#define WEBRTC_MODULES_RTP_RTCP_RTP_HEADER_EXTENSION_H_
#include <map>
#include "webrtc/modules/rtp_rtcp/interface/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;
struct HeaderExtension {
HeaderExtension(RTPExtensionType extension_type)
: type(extension_type), length(0), active(true) {
Init();
}
HeaderExtension(RTPExtensionType extension_type, bool active)
: type(extension_type), length(0), active(active) {
Init();
}
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;
break;
case kRtpExtensionAudioLevel:
length = kAudioLevelLength;
break;
case kRtpExtensionAbsoluteSendTime:
length = kAbsoluteSendTimeLength;
break;
case kRtpExtensionVideoRotation:
length = kVideoRotationLength;
break;
case kRtpExtensionTransportSequenceNumber:
length = kTransportSequenceNumberLength;
break;
default:
assert(false);
}
}
const RTPExtensionType type;
uint8_t length;
bool active;
};
class RtpHeaderExtensionMap {
public:
RtpHeaderExtensionMap();
~RtpHeaderExtensionMap();
void Erase();
int32_t Register(const RTPExtensionType type, const uint8_t id);
// Active is a concept for a registered rtp header extension which doesn't
// take effect yet until being activated. Inactive RTP header extensions do
// not take effect and should not be included in size calculations until they
// are activated.
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;
int32_t GetId(const RTPExtensionType type, uint8_t* id) 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;
private:
int32_t Register(const RTPExtensionType type, const uint8_t id, bool active);
std::map<uint8_t, HeaderExtension*> extensionMap_;
};
}
#endif // WEBRTC_MODULES_RTP_RTCP_RTP_HEADER_EXTENSION_H_
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