1 /** 2 * Copyright (c) 2020 Filip Klembara (in2core) 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with this library; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 19 #ifndef RTC_H264_RTP_PACKETIZER_H 20 #define RTC_H264_RTP_PACKETIZER_H 21 22 #if RTC_ENABLE_MEDIA 23 24 #include "mediahandlerrootelement.hpp" 25 #include "nalunit.hpp" 26 #include "rtppacketizer.hpp" 27 28 namespace rtc { 29 30 /// RTP packetization of h264 payload 31 class RTC_CPP_EXPORT H264RtpPacketizer final : public RtpPacketizer, 32 public MediaHandlerRootElement { 33 shared_ptr<NalUnits> splitMessage(binary_ptr message); 34 const uint16_t maximumFragmentSize; 35 36 public: 37 /// Default clock rate for H264 in RTP 38 inline static const uint32_t defaultClockRate = 90 * 1000; 39 40 /// NAL unit separator 41 enum class Separator { 42 Length = RTC_NAL_SEPARATOR_LENGTH, // first 4 bytes are NAL unit length 43 LongStartSequence = RTC_NAL_SEPARATOR_LONG_START_SEQUENCE, // 0x00, 0x00, 0x00, 0x01 44 ShortStartSequence = RTC_NAL_SEPARATOR_SHORT_START_SEQUENCE, // 0x00, 0x00, 0x01 45 StartSequence = RTC_NAL_SEPARATOR_START_SEQUENCE, // LongStartSequence or ShortStartSequence 46 }; 47 48 H264RtpPacketizer(H264RtpPacketizer::Separator separator, 49 shared_ptr<RtpPacketizationConfig> rtpConfig, 50 uint16_t maximumFragmentSize = NalUnits::defaultMaximumFragmentSize); 51 52 /// Constructs h264 payload packetizer with given RTP configuration. 53 /// @note RTP configuration is used in packetization process which may change some configuration 54 /// properties such as sequence number. 55 /// @param rtpConfig RTP configuration 56 /// @param maximumFragmentSize maximum size of one NALU fragment 57 H264RtpPacketizer(shared_ptr<RtpPacketizationConfig> rtpConfig, 58 uint16_t maximumFragmentSize = NalUnits::defaultMaximumFragmentSize); 59 60 ChainedOutgoingProduct processOutgoingBinaryMessage(ChainedMessagesProduct messages, 61 message_ptr control) override; 62 63 private: 64 const Separator separator; 65 }; 66 67 } // namespace rtc 68 69 #endif /* RTC_ENABLE_MEDIA */ 70 71 #endif /* RTC_H264_RTP_PACKETIZER_H */ 72