mirror of
https://github.com/mii443/libdatachannel.git
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124 lines
3.9 KiB
C++
124 lines
3.9 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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#if RTC_ENABLE_MEDIA
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#include "rtcpnackresponder.hpp"
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#include "impl/internals.hpp"
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#include <cassert>
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namespace rtc {
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RtcpNackResponder::Storage::Element::Element(binary_ptr packet, uint16_t sequenceNumber, shared_ptr<Element> next)
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: packet(packet), sequenceNumber(sequenceNumber), next(next) { }
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unsigned RtcpNackResponder::Storage::size() { return storage.size(); }
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RtcpNackResponder::Storage::Storage(unsigned _maximumSize): maximumSize(_maximumSize) {
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assert(maximumSize > 0);
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storage.reserve(maximumSize);
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}
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optional<binary_ptr> RtcpNackResponder::Storage::get(uint16_t sequenceNumber) {
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auto position = storage.find(sequenceNumber);
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return position != storage.end() ? std::make_optional(storage.at(sequenceNumber)->packet) : nullopt;
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}
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void RtcpNackResponder::Storage::store(binary_ptr packet) {
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if (!packet || packet->size() < 12) {
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return;
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}
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auto rtp = reinterpret_cast<RTP *>(packet->data());
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auto sequenceNumber = rtp->seqNumber();
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assert((storage.empty() && !oldest && !newest) || (!storage.empty() && oldest && newest));
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if (size() == 0) {
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newest = std::make_shared<Element>(packet, sequenceNumber);
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oldest = newest;
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} else {
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auto current = std::make_shared<Element>(packet, sequenceNumber);
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newest->next = current;
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newest = current;
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}
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storage.emplace(sequenceNumber, newest);
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if (size() > maximumSize) {
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assert(oldest);
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if (oldest) {
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storage.erase(oldest->sequenceNumber);
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oldest = oldest->next;
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}
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}
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}
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RtcpNackResponder::RtcpNackResponder(unsigned maxStoredPacketCount)
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: MediaHandlerElement(), storage(std::make_shared<Storage>(maxStoredPacketCount)) { }
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ChainedIncomingControlProduct RtcpNackResponder::processIncomingControlMessage(message_ptr message) {
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optional<ChainedOutgoingProduct> optPackets = ChainedOutgoingProduct(nullptr);
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auto packets = make_chained_messages_product();
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unsigned int i = 0;
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while (i < message->size()) {
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auto nack = reinterpret_cast<RTCP_NACK *>(message->data() + i);
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i += nack->header.header.lengthInBytes();
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// check if rtcp is nack
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if (nack->header.header.payloadType() != 205 || nack->header.header.reportCount() != 1) {
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continue;
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}
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auto fieldsCount = nack->getSeqNoCount();
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std::vector<uint16_t> missingSequenceNumbers{};
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for(unsigned int i = 0; i < fieldsCount; i++) {
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auto field = nack->parts[i];
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auto newMissingSeqenceNumbers = field.getSequenceNumbers();
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missingSequenceNumbers.insert(missingSequenceNumbers.end(), newMissingSeqenceNumbers.begin(), newMissingSeqenceNumbers.end());
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}
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packets->reserve(packets->size() + missingSequenceNumbers.size());
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for (auto sequenceNumber: missingSequenceNumbers) {
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auto optPacket = storage->get(sequenceNumber);
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if (optPacket.has_value()) {
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auto packet = optPacket.value();
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packets->push_back(packet);
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}
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}
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}
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if (!packets->empty()) {
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return {message, ChainedOutgoingProduct(packets)};
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} else {
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return {message, nullopt};
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}
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}
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ChainedOutgoingProduct RtcpNackResponder::processOutgoingBinaryMessage(ChainedMessagesProduct messages, message_ptr control) {
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for (auto message: *messages) {
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storage->store(message);
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}
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return {messages, control};
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}
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} // namespace rtc
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#endif /* RTC_ENABLE_MEDIA */
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