Switched from sync transcoder to async transcoder
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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 "AudioFile.hpp"
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extern "C"
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{
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#define __STDC_CONSTANT_MACROS
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#include <libavcodec/avcodec.h>
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#include <libavformat/avformat.h>
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#include <libavutil/error.h>
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}
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#include <array>
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#include "utils/Logger.hpp"
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#include "utils/String.hpp"
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namespace Av {
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static std::string averror_to_string(int error)
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{
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std::array<char, 128> buf = {0};
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if (av_strerror(error, buf.data(), buf.size()) == 0)
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return &buf[0];
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else
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return "Unknown error";
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}
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class AudioFileException : public Av::Exception
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{
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public:
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AudioFileException(int avError)
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: Av::Exception {"AudioFileException: " + averror_to_string(avError)}
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{}
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};
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std::unique_ptr<IAudioFile>
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parseAudioFile(const std::filesystem::path& p)
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{
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return std::make_unique<AudioFile>(p);
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}
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AudioFile::AudioFile(const std::filesystem::path& p)
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: _p {p}
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{
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int error {avformat_open_input(&_context, _p.string().c_str(), nullptr, nullptr)};
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if (error < 0)
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{
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LMS_LOG(AV, ERROR) << "Cannot open " << _p.string() << ": " << averror_to_string(error);
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throw AudioFileException {error};
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}
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error = avformat_find_stream_info(_context, nullptr);
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if (error < 0)
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{
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LMS_LOG(AV, ERROR) << "Cannot find stream information on " << _p.string() << ": " << averror_to_string(error);
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avformat_close_input(&_context);
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throw AudioFileException {error};
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}
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}
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AudioFile::~AudioFile()
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{
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avformat_close_input(&_context);
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}
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const std::filesystem::path&
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AudioFile::getPath() const
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{
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return _p;
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}
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std::chrono::milliseconds
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AudioFile::getDuration() const
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{
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if (_context->duration == AV_NOPTS_VALUE)
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return std::chrono::milliseconds {0}; // TODO estimate
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return std::chrono::milliseconds {_context->duration / AV_TIME_BASE * 1000};
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}
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void
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getMetaDataFromDictionnary(AVDictionary* dictionnary, AudioFile::MetadataMap& res)
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{
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if (!dictionnary)
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return;
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AVDictionaryEntry *tag = NULL;
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while ((tag = av_dict_get(dictionnary, "", tag, AV_DICT_IGNORE_SUFFIX)))
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{
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res[StringUtils::stringToUpper(tag->key)] = tag->value;
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}
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}
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AudioFile::MetadataMap
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AudioFile::getMetaData() const
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{
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MetadataMap res;
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getMetaDataFromDictionnary(_context->metadata, res);
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// HACK for OGG files
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// If we did not find tags, search metadata in streams
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if (res.empty())
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{
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for (std::size_t i {}; i < _context->nb_streams; ++i)
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{
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getMetaDataFromDictionnary(_context->streams[i]->metadata, res);
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if (!res.empty())
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break;
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}
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}
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return res;
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}
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std::vector<StreamInfo>
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AudioFile::getStreamInfo() const
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{
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std::vector<StreamInfo> res;
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for (std::size_t i {}; i < _context->nb_streams; ++i)
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{
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AVStream* avstream { _context->streams[i]};
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// Skip attached pics
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if (avstream->disposition & AV_DISPOSITION_ATTACHED_PIC)
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continue;
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if (!avstream->codecpar)
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{
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LMS_LOG(AV, ERROR) << "Skipping stream " << i << " since no codecpar is set";
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continue;
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}
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if (avstream->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
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continue;
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res.push_back( {i, static_cast<std::size_t>(avstream->codecpar->bit_rate)} );
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}
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return res;
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}
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std::optional<std::size_t>
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AudioFile::getBestStream() const
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{
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int res = av_find_best_stream(_context,
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AVMEDIA_TYPE_AUDIO,
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-1, // Auto
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-1, // Auto
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NULL,
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0);
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if (res < 0)
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return std::nullopt;
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return res;
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}
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bool
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AudioFile::hasAttachedPictures(void) const
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{
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for (std::size_t i = 0; i < _context->nb_streams; ++i)
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{
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if (_context->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC)
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return true;
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}
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return false;
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}
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void
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AudioFile::visitAttachedPictures(std::function<void(const Picture&)> func) const
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{
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static const std::unordered_map<int, std::string> codecMimeMap =
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{
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{ AV_CODEC_ID_BMP, "image/x-bmp" },
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{ AV_CODEC_ID_GIF, "image/gif" },
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{ AV_CODEC_ID_MJPEG, "image/jpeg" },
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{ AV_CODEC_ID_PNG, "image/png" },
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{ AV_CODEC_ID_PNG, "image/x-png" },
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{ AV_CODEC_ID_PPM, "image/x-portable-pixmap" },
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};
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for (std::size_t i = 0; i < _context->nb_streams; ++i)
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{
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AVStream *avstream = _context->streams[i];
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// Skip attached pics
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if (!(avstream->disposition & AV_DISPOSITION_ATTACHED_PIC))
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continue;
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if (avstream->codecpar == nullptr)
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{
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LMS_LOG(AV, ERROR) << "Skipping stream " << i << " since no codecpar is set";
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continue;
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}
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Picture picture;
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auto itMime = codecMimeMap.find(avstream->codecpar->codec_id);
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if (itMime != codecMimeMap.end())
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{
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picture.mimeType = itMime->second;
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}
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else
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{
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picture.mimeType = "application/octet-stream";
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LMS_LOG(AV, ERROR) << "CODEC ID " << avstream->codecpar->codec_id << " not handled in mime type conversion";
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}
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const AVPacket& pkt {avstream->attached_pic};
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picture.data = reinterpret_cast<const std::byte*>(pkt.data);
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picture.dataSize = pkt.size;
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func(picture);
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}
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}
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std::optional<AudioFileFormat>
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guessMediaFileFormat(const std::filesystem::path& file)
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{
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AVOutputFormat* format {av_guess_format(NULL,file.string().c_str(),NULL)};
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if (!format || !format->name)
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return {};
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LMS_LOG(AV, DEBUG) << "File '" << file.string() << "', formats = '" << format->name << "'";
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auto formats {StringUtils::splitString(format->name, ",")};
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if (formats.size() > 1)
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LMS_LOG(AV, INFO) << "File '" << file.string() << "' reported several formats: '" << format->name << "'";
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std::vector<std::string> mimeTypes;
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if (format->mime_type)
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mimeTypes = StringUtils::splitString(format->mime_type, ",");
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if (mimeTypes.empty())
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LMS_LOG(AV, INFO) << "File '" << file.string() << "', no mime type found!";
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else if (mimeTypes.size() > 1)
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LMS_LOG(AV, INFO) << "File '" << file.string() << "' reported several mime types: '" << format->mime_type << "'";
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AudioFileFormat res;
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res.format = formats.front();
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res.mimeType = mimeTypes.empty() ? "application/octet-stream" : mimeTypes.front();
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return res;
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}
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} // namespace Av
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