Split the lib in smaller libs to ease unit tests
This commit is contained in:
emeric
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/*
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* Copyright (C) 2015 Emeric Poupon
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*
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* This file is part of LMS.
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*
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* LMS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* LMS 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 LMS. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "av/AvTranscoder.hpp"
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#include <atomic>
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#include <mutex>
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#include "av/AvInfo.hpp"
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#include "utils/IConfig.hpp"
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#include "utils/Path.hpp"
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#include "utils/Logger.hpp"
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#include "utils/Service.hpp"
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namespace Av {
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#define LMS_LOG_TRANSCODE(sev) LMS_LOG(TRANSCODE, sev) << "[" << _id << "] - "
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static std::atomic<size_t> globalId {};
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static std::filesystem::path ffmpegPath;
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void
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Transcoder::init()
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{
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ffmpegPath = ServiceProvider<IConfig>::get()->getPath("ffmpeg-file", "/usr/bin/ffmpeg");
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if (!std::filesystem::exists(ffmpegPath))
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throw LmsException {"File '" + ffmpegPath.string() + "' does not exist!"};
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}
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Transcoder::Transcoder(const std::filesystem::path& filePath, const TranscodeParameters& parameters)
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: _filePath {filePath},
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_parameters {parameters},
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_id {globalId++}
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{
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}
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bool
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Transcoder::start()
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{
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if (!std::filesystem::exists(_filePath))
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return false;
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else if (!std::filesystem::is_regular_file( _filePath) )
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return false;
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LMS_LOG_TRANSCODE(INFO) << "Transcoding file '" << _filePath.string() << "'";
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std::vector<std::string> args;
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args.emplace_back(ffmpegPath.string());
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// Make sure we do not produce anything in the stderr output
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// in order not to block the whole forked process
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args.emplace_back("-loglevel");
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args.emplace_back("quiet");
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args.emplace_back("-nostdin");
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// input Offset
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if (_parameters.offset)
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{
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args.emplace_back("-ss");
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args.emplace_back(std::to_string((*_parameters.offset).count()));
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}
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// Input file
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args.emplace_back("-i");
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args.emplace_back(_filePath.string());
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// Stream mapping, if set
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if (_parameters.stream)
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{
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args.emplace_back("-map");
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args.emplace_back("0:" + std::to_string(*_parameters.stream));
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}
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if (_parameters.stripMetadata)
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{
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// Strip metadata
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args.emplace_back("-map_metadata");
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args.emplace_back("-1");
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}
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// Skip video flows (including covers)
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args.emplace_back("-vn");
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// Codecs and formats
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if (_parameters.encoding)
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{
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// Output bitrates
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args.emplace_back("-b:a");
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args.emplace_back(std::to_string(_parameters.bitrate));
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switch (*_parameters.encoding)
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{
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case Encoding::MP3:
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args.emplace_back("-f");
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args.emplace_back("mp3");
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break;
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case Encoding::OGG_OPUS:
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args.emplace_back("-acodec");
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args.emplace_back("libopus");
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args.emplace_back("-f");
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args.emplace_back("ogg");
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break;
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case Encoding::MATROSKA_OPUS:
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args.emplace_back("-acodec");
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args.emplace_back("libopus");
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args.emplace_back("-f");
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args.emplace_back("matroska");
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break;
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case Encoding::OGG_VORBIS:
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args.emplace_back("-acodec");
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args.emplace_back("libvorbis");
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args.emplace_back("-f");
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args.emplace_back("ogg");
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break;
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case Encoding::WEBM_VORBIS:
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args.emplace_back("-acodec");
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args.emplace_back("libvorbis");
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args.emplace_back("-f");
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args.emplace_back("webm");
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break;
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default:
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return false;
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}
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_outputMimeType = encodingToMimetype(*_parameters.encoding);
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}
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else
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{
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auto mediaFileFormat {guessMediaFileFormat(_filePath)};
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if (!mediaFileFormat)
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{
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LMS_LOG(AV, ERROR) << "Cannot guess media file format for '" << _filePath.string() << "'";
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return false;
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}
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args.emplace_back("-acodec");
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args.emplace_back("copy");
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args.emplace_back("-f");
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args.emplace_back(mediaFileFormat->format);
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_outputMimeType = mediaFileFormat->mimeType;
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}
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args.emplace_back("pipe:1");
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LMS_LOG_TRANSCODE(DEBUG) << "Dumping args (" << args.size() << ")";
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for (const std::string& arg : args)
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LMS_LOG_TRANSCODE(DEBUG) << "Arg = '" << arg << "'";
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// make sure only one thread is executing this part of code
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{
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static std::mutex transcoderMutex;
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std::lock_guard<std::mutex> lock {transcoderMutex};
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_child = std::make_shared<redi::ipstream>();
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// Caution: stdin must have been closed before
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_child->open(ffmpegPath.string(), args);
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if (!_child->is_open())
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{
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LMS_LOG_TRANSCODE(DEBUG) << "Exec failed!";
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return false;
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}
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if (_child->out().eof())
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{
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LMS_LOG_TRANSCODE(DEBUG) << "Early end of file!";
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return false;
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}
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}
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LMS_LOG_TRANSCODE(DEBUG) << "Stream opened!";
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return true;
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}
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void
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Transcoder::process(std::vector<unsigned char>& output, std::size_t maxSize)
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{
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if (!_child || _isComplete)
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return;
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if (_child->out().fail())
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{
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LMS_LOG_TRANSCODE(DEBUG) << "Stdout FAILED 2";
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}
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if (_child->out().eof())
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{
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LMS_LOG_TRANSCODE(DEBUG) << "Stdout ENDED 2";
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}
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output.resize(maxSize);
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//Read on the output stream
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_child->out().read(reinterpret_cast<char*>(&output[0]), maxSize);
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output.resize(_child->out().gcount());
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if (_child->out().fail())
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{
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LMS_LOG_TRANSCODE(DEBUG) << "Stdout FAILED";
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}
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if (_child->out().eof())
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{
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LMS_LOG_TRANSCODE(DEBUG) << "Stdout EOF!";
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_child->clear();
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_isComplete = true;
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_child.reset();
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}
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_total += output.size();
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LMS_LOG_TRANSCODE(DEBUG) << "nb bytes = " << output.size() << ", total = " << _total;
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}
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Transcoder::~Transcoder()
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{
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LMS_LOG_TRANSCODE(DEBUG) << ", ~Transcoder called! Total produced bytes = " << _total;
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if (_child)
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{
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LMS_LOG_TRANSCODE(DEBUG) << "Child still here!";
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_child->rdbuf()->kill(SIGKILL);
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LMS_LOG_TRANSCODE(DEBUG) << "Closing...";
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_child->rdbuf()->close();
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LMS_LOG_TRANSCODE(DEBUG) << "Closing DONE";
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}
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}
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} // namespace Transcode
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