mirror of
https://github.com/mii443/libdatachannel.git
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96 lines
3.4 KiB
C++
96 lines
3.4 KiB
C++
/**
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* Copyright (c) 2020 Filip Klembara (in2core)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef RTC_RTP_PACKETIZATION_CONFIG_H
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#define RTC_RTP_PACKETIZATION_CONFIG_H
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#if RTC_ENABLE_MEDIA
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#include "rtp.hpp"
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namespace rtc {
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/// RTP configuration used in packetization process
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class RTC_CPP_EXPORT RtpPacketizationConfig {
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uint32_t _startTimestamp = 0;
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double _startTime_s = 0;
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RtpPacketizationConfig(const RtpPacketizationConfig &) = delete;
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public:
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const SSRC ssrc;
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const std::string cname;
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const uint8_t payloadType;
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const uint32_t clockRate;
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const double &startTime_s = _startTime_s;
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const uint32_t &startTimestamp = _startTimestamp;
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/// current sequence number
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uint16_t sequenceNumber;
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/// current timestamp
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uint32_t timestamp;
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enum class EpochStart : unsigned long long {
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T1970 = 2208988800, // number of seconds between 1970 and 1900
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T1900 = 0
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};
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/// Creates relation between time and timestamp mapping given start time and start timestamp
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/// @param startTime_s Start time of the stream
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/// @param epochStart Type of used epoch
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/// @param startTimestamp Corresponding timestamp for given start time (current timestamp will
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/// be used if value is nullopt)
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void setStartTime(double startTime_s, EpochStart epochStart,
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optional<uint32_t> startTimestamp = std::nullopt);
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/// Construct RTP configuration used in packetization process
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/// @param ssrc SSRC of source
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/// @param cname CNAME of source
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/// @param payloadType Payload type of source
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/// @param clockRate Clock rate of source used in timestamps
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/// @param sequenceNumber Initial sequence number of RTP packets (random number is choosed if
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/// nullopt)
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/// @param timestamp Initial timastamp of RTP packets (random number is choosed if nullopt)
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RtpPacketizationConfig(SSRC ssrc, std::string cname, uint8_t payloadType, uint32_t clockRate,
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optional<uint16_t> sequenceNumber = std::nullopt,
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optional<uint32_t> timestamp = std::nullopt);
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/// Convert timestamp to seconds
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/// @param timestamp Timestamp
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/// @param clockRate Clock rate for timestamp calculation
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static double getSecondsFromTimestamp(uint32_t timestamp, uint32_t clockRate);
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/// Convert timestamp to seconds
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/// @param timestamp Timestamp
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double timestampToSeconds(uint32_t timestamp);
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/// Convert seconds to timestamp
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/// @param seconds Number of seconds
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/// @param clockRate Clock rate for timestamp calculation
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static uint32_t getTimestampFromSeconds(double seconds, uint32_t clockRate);
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/// Convert seconds to timestamp
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/// @param seconds Number of seconds
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uint32_t secondsToTimestamp(double seconds);
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};
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} // namespace rtc
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#endif /* RTC_ENABLE_MEDIA */
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#endif /* RTC_RTP_PACKETIZATION_CONFIG_H */
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