mirror of
https://github.com/mii443/libdatachannel.git
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71 lines
2.5 KiB
C++
71 lines
2.5 KiB
C++
/*
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* libdatachannel streamer example
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* Copyright (c) 2020 Filip Klembara (in2core)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "h264fileparser.hpp"
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#include <fstream>
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#include "rtc/rtc.hpp"
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using namespace std;
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H264FileParser::H264FileParser(string directory, uint32_t fps, bool loop): FileParser(directory, ".h264", fps, loop) { }
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void H264FileParser::loadNextSample() {
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FileParser::loadNextSample();
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unsigned long long i = 0;
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while (i < sample.size()) {
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assert(i + 4 < sample.size());
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auto lengthPtr = (uint32_t *) (sample.data() + i);
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uint32_t length = ntohl(*lengthPtr);
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auto naluStartIndex = i + 4;
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auto naluEndIndex = naluStartIndex + length;
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assert(naluEndIndex <= sample.size());
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auto header = reinterpret_cast<rtc::NalUnitHeader *>(sample.data() + naluStartIndex);
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auto type = header->unitType();
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switch (type) {
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case 7:
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previousUnitType7 = {sample.begin() + i, sample.begin() + naluEndIndex};
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break;
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case 8:
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previousUnitType8 = {sample.begin() + i, sample.begin() + naluEndIndex};;
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break;
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case 5:
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previousUnitType5 = {sample.begin() + i, sample.begin() + naluEndIndex};;
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break;
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}
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i = naluEndIndex;
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}
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}
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vector<byte> H264FileParser::initialNALUS() {
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vector<byte> units{};
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if (previousUnitType7.has_value()) {
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auto nalu = previousUnitType7.value();
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units.insert(units.end(), nalu.begin(), nalu.end());
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}
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if (previousUnitType8.has_value()) {
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auto nalu = previousUnitType8.value();
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units.insert(units.end(), nalu.begin(), nalu.end());
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}
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if (previousUnitType5.has_value()) {
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auto nalu = previousUnitType5.value();
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units.insert(units.end(), nalu.begin(), nalu.end());
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}
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return units;
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}
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