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#include "AudioFile.h"
#include <sstream>
#include <algorithm>
#include <taglib.h>
#include <fileref.h>
#include <mpegfile.h>
#include <id3v2tag.h>
#include <vorbisfile.h>
#include <flacfile.h>
#include <xiphcomment.h>
#include <mp4file.h>
#include <mp4tag.h>
/* Turn a string into an integer type for any map class. */
template <typename T, typename M>
inline T extractTag(M &map, const char *key)
{
T ret = 0;
std::stringstream stream(extractTag<std::string>(map, key));
stream >> ret;
return ret;
}
/* Turn a string into a bool, based on "1" and "true", for any map class. */
template <typename M>
inline bool extractTag(M &map, const char *key)
{
std::string str(extractTag<std::string>(map, key));
std::transform(str.begin(), str.end(), str.begin(), ::tolower);
return (str == "1" || str == "true");
}
/* Extract a string out of an MP3 map. */
template <>
inline std::string extractTag(const TagLib::ID3v2::FrameListMap &map, const char *key)
{
if (map[key].isEmpty())
return std::string();
return map[key].front()->toString().to8Bit(true);
}
/* Extract a string out of an OGG map. */
template <>
inline std::string extractTag(const TagLib::Ogg::FieldListMap &map, const char *key)
{
if (map[key].isEmpty())
return std::string();
return map[key].front().to8Bit(true);
}
/* Extract an integer out of an MP4 map. */
template <>
inline unsigned int extractTag(const TagLib::MP4::ItemListMap &map, const char *key)
{
if (!map[key].isValid())
return 0;
return map[key].toInt();
}
/* Extract a string out of an MP4 map. */
template <>
inline std::string extractTag(const TagLib::MP4::ItemListMap &map, const char *key)
{
if (!map[key].isValid())
return std::string();
return map[key].toStringList().toString().to8Bit(true);
}
/* Extract a bool out of an MP4 map. */
template <>
inline bool extractTag(const TagLib::MP4::ItemListMap &map, const char *key)
{
if (!map[key].isValid())
return false;
return map[key].toBool();
}
AudioFile::AudioFile(const std::string &filename) :
m_isValid(false),
m_filename(filename),
m_track(0),
m_disc(0),
m_bpm(0),
m_year(0),
m_length(0),
m_bitrate(0),
m_sampleRate(0),
m_channels(0),
m_compilation(false)
{
TagLib::FileRef fileRef(filename.c_str());
if (fileRef.isNull() || !fileRef.tag())
return;
/* First we copy out everything TagLib actually supports. */
if (const TagLib::Tag *tag = fileRef.tag()) {
m_title = tag->title().to8Bit(true);
m_artist = tag->artist().to8Bit(true);
m_album = tag->album().to8Bit(true);
m_comment = tag->comment().to8Bit(true);
m_genre = tag->genre().to8Bit(true);
m_year = tag->year();
m_track = tag->track();
/* Sometimes these integers are supposed to wrap,
* and taglib doesn't know about it, so we do it manually. */
if (m_track == 4294967295)
m_track = 0;
if (m_year == 4294967295)
m_year = 0;
}
/* If there isn't a title, generate one from the basename sans-extension of the file. */
if (m_title.length() == 0) {
size_t pos;
m_title = filename;
pos = m_title.find_last_of('/');
if (pos != std::string::npos)
m_title.erase(0, pos + 1);
pos = m_title.find_last_of('.');
if (pos != std::string::npos)
m_title.erase(pos);
}
/* TagLib also provides AudioProperties. */
if (const TagLib::AudioProperties *audio = fileRef.audioProperties()) {
m_length = audio->length();
m_bitrate = audio->bitrate();
m_sampleRate = audio->sampleRate();
m_channels = audio->channels();
}
/* Now we look at format specific tags, attempting to upcast, and then extracting fields. */
if (TagLib::MPEG::File *file = dynamic_cast<TagLib::MPEG::File*>(fileRef.file())) {
if (file->ID3v2Tag()) {
const TagLib::ID3v2::FrameListMap &map = file->ID3v2Tag()->frameListMap();
m_disc = extractTag<unsigned int>(map, "TPOS");
m_bpm = extractTag<unsigned int>(map, "TBPM");
m_composer = extractTag<std::string>(map, "TCOM");
m_albumArtist = extractTag<std::string>(map, "TPE2");
m_compilation = extractTag<bool>(map, "TCMP");
}
} else if (TagLib::Ogg::Vorbis::File *file = dynamic_cast<TagLib::Ogg::Vorbis::File*>(fileRef.file())) {
if (file->tag()) {
const TagLib::Ogg::FieldListMap &map = file->tag()->fieldListMap();
m_disc = extractTag<unsigned int>(map, "DISCNUMBER");
m_bpm = extractTag<unsigned int>(map, "BPM");
m_composer = extractTag<std::string>(map, "COMPOSER");
m_compilation = extractTag<bool>(map, "COMPILATION");
}
} else if (TagLib::FLAC::File *file = dynamic_cast<TagLib::FLAC::File*>(fileRef.file())) {
if (file->xiphComment()) {
const TagLib::Ogg::FieldListMap &map = file->xiphComment()->fieldListMap();
m_disc = extractTag<unsigned int>(map, "DISCNUMBER");
m_bpm = extractTag<unsigned int>(map, "BPM");
m_composer = extractTag<std::string>(map, "COMPOSER");
m_compilation = extractTag<bool>(map, "COMPILATION");
}
} else if (TagLib::MP4::File *file = dynamic_cast<TagLib::MP4::File*>(fileRef.file())) {
if (file->tag()) {
const TagLib::MP4::ItemListMap &map = file->tag()->itemListMap();
m_disc = extractTag<unsigned int>(map, "disk");
m_bpm = extractTag<unsigned int>(map, "tmpo");
m_albumArtist = extractTag<std::string>(map, "aART");
m_composer = extractTag<std::string>(map, "\xa9wrt");
m_compilation = extractTag<bool>(map, "cpil");
}
}
m_isValid = true;
}
bool AudioFile::operator<(const AudioFile &other) const
{
int comp;
if (comp = m_artist.compare(other.m_artist))
return comp < 0;
if (m_year != other.m_year)
return m_year < other.m_year;
if (comp = m_album.compare(other.m_album))
return comp < 0;
if (m_track != other.m_track)
return m_track < other.m_track;
return m_title.compare(other.m_title) < 0;
}
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