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/*
* libdatachannel streamer example
* Copyright (c) 2020 Filip Klembara (in2core)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef RTC_RTP_PACKETIZATION_CONFIG_H
#define RTC_RTP_PACKETIZATION_CONFIG_H
#if RTC_ENABLE_MEDIA
#include "rtp.hpp"
namespace rtc {
/// RTP configuration used in packetization process
class RTC_CPP_EXPORT RtpPacketizationConfig {
uint32_t _startTimestamp = 0;
double _startTime_s = 0;
RtpPacketizationConfig(const RtpPacketizationConfig &) = delete;
public:
const SSRC ssrc;
const std::string cname;
const uint8_t payloadType;
const uint32_t clockRate;
const double &startTime_s = _startTime_s;
const uint32_t &startTimestamp = _startTimestamp;
/// current sequence number
uint16_t sequenceNumber;
/// current timestamp
uint32_t timestamp;
enum class EpochStart : unsigned long long {
T1970 = 2208988800, // number of seconds between 1970 and 1900
T1900 = 0
};
/// Creates relation between time and timestamp mapping given start time and start timestamp
/// @param startTime_s Start time of the stream
/// @param epochStart Type of used epoch
/// @param startTimestamp Corresponding timestamp for given start time (current timestamp will
/// be used if value is nullopt)
void setStartTime(double startTime_s, EpochStart epochStart,
std::optional<uint32_t> startTimestamp = std::nullopt);
/// Construct RTP configuration used in packetization process
/// @param ssrc SSRC of source
/// @param cname CNAME of source
/// @param payloadType Payload type of source
/// @param clockRate Clock rate of source used in timestamps
/// @param sequenceNumber Initial sequence number of RTP packets (random number is choosed if
/// nullopt)
/// @param timestamp Initial timastamp of RTP packets (random number is choosed if nullopt)
RtpPacketizationConfig(SSRC ssrc, std::string cname, uint8_t payloadType, uint32_t clockRate,
std::optional<uint16_t> sequenceNumber = std::nullopt,
std::optional<uint32_t> timestamp = std::nullopt);
/// Convert timestamp to seconds
/// @param timestamp Timestamp
/// @param clockRate Clock rate for timestamp calculation
static double getSecondsFromTimestamp(uint32_t timestamp, uint32_t clockRate);
/// Convert timestamp to seconds
/// @param timestamp Timestamp
double timestampToSeconds(uint32_t timestamp);
/// Convert seconds to timestamp
/// @param seconds Number of seconds
/// @param clockRate Clock rate for timestamp calculation
static uint32_t getTimestampFromSeconds(double seconds, uint32_t clockRate);
/// Convert seconds to timestamp
/// @param seconds Number of seconds
uint32_t secondsToTimestamp(double seconds);
};
} // namespace rtc
#endif /* RTC_ENABLE_MEDIA */
#endif /* RTC_RTP_PACKETIZATION_CONFIG_H */