| /* |
| * 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_SOURCE_RTP_UTILITY_H_ |
| #define WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_UTILITY_H_ |
| |
| #include <stddef.h> // size_t, ptrdiff_t |
| |
| #include "webrtc/modules/rtp_rtcp/interface/rtp_rtcp_defines.h" |
| #include "webrtc/modules/rtp_rtcp/interface/receive_statistics.h" |
| #include "webrtc/modules/rtp_rtcp/source/rtp_header_extension.h" |
| #include "webrtc/modules/rtp_rtcp/source/rtp_rtcp_config.h" |
| #include "webrtc/typedefs.h" |
| |
| namespace webrtc { |
| |
| const uint8_t kRtpMarkerBitMask = 0x80; |
| |
| RtpData* NullObjectRtpData(); |
| RtpFeedback* NullObjectRtpFeedback(); |
| RtpAudioFeedback* NullObjectRtpAudioFeedback(); |
| ReceiveStatistics* NullObjectReceiveStatistics(); |
| |
| namespace RtpUtility { |
| // January 1970, in NTP seconds. |
| const uint32_t NTP_JAN_1970 = 2208988800UL; |
| |
| // Magic NTP fractional unit. |
| const double NTP_FRAC = 4.294967296E+9; |
| |
| struct Payload |
| { |
| char name[RTP_PAYLOAD_NAME_SIZE]; |
| bool audio; |
| PayloadUnion typeSpecific; |
| }; |
| |
| typedef std::map<int8_t, Payload*> PayloadTypeMap; |
| |
| // Return the current RTP timestamp from the NTP timestamp |
| // returned by the specified clock. |
| uint32_t GetCurrentRTP(Clock* clock, uint32_t freq); |
| |
| // Return the current RTP absolute timestamp. |
| uint32_t ConvertNTPTimeToRTP(uint32_t NTPsec, |
| uint32_t NTPfrac, |
| uint32_t freq); |
| |
| uint32_t pow2(uint8_t exp); |
| |
| // Returns true if |newTimestamp| is older than |existingTimestamp|. |
| // |wrapped| will be set to true if there has been a wraparound between the |
| // two timestamps. |
| bool OldTimestamp(uint32_t newTimestamp, |
| uint32_t existingTimestamp, |
| bool* wrapped); |
| |
| bool StringCompare(const char* str1, |
| const char* str2, |
| const uint32_t length); |
| |
| // Round up to the nearest size that is a multiple of 4. |
| size_t Word32Align(size_t size); |
| |
| class RtpHeaderParser { |
| public: |
| RtpHeaderParser(const uint8_t* rtpData, size_t rtpDataLength); |
| ~RtpHeaderParser(); |
| |
| bool RTCP() const; |
| bool ParseRtcp(RTPHeader* header) const; |
| bool Parse(RTPHeader& parsedPacket, |
| RtpHeaderExtensionMap* ptrExtensionMap = NULL) const; |
| |
| private: |
| void ParseOneByteExtensionHeader( |
| RTPHeader& parsedPacket, |
| const RtpHeaderExtensionMap* ptrExtensionMap, |
| const uint8_t* ptrRTPDataExtensionEnd, |
| const uint8_t* ptr) const; |
| |
| uint8_t ParsePaddingBytes( |
| const uint8_t* ptrRTPDataExtensionEnd, |
| const uint8_t* ptr) const; |
| |
| const uint8_t* const _ptrRTPDataBegin; |
| const uint8_t* const _ptrRTPDataEnd; |
| }; |
| } // namespace RtpUtility |
| } // namespace webrtc |
| |
| #endif // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_UTILITY_H_ |