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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;
struct HeaderExtension {
HeaderExtension(RTPExtensionType extension_type)
: type(extension_type),
length(0) {
// 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:
// TODO(solenberg): Because of how the audio level extension is handled
// in RTPSenderAudio::SendAudio(), we cannot set the actual length here
// but must leave it at zero. The consequence is that any other header
// extensions registered for an audio channel are effectively ignored.
// length = kAudioLevelLength;
break;
case kRtpExtensionAbsoluteSendTime:
length = kAbsoluteSendTimeLength;
break;
default:
assert(false);
}
}
const RTPExtensionType type;
uint8_t length;
};
class RtpHeaderExtensionMap {
public:
RtpHeaderExtensionMap();
~RtpHeaderExtensionMap();
void Erase();
int32_t Register(const RTPExtensionType type, const uint8_t id);
int32_t Deregister(const RTPExtensionType type);
int32_t GetType(const uint8_t id, RTPExtensionType* type) const;
int32_t GetId(const RTPExtensionType type, uint8_t* id) const;
uint16_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:
std::map<uint8_t, HeaderExtension*> extensionMap_;
};
}
#endif // WEBRTC_MODULES_RTP_RTCP_RTP_HEADER_EXTENSION_H_
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