func loadSong(filename string) (song Song, err error) {
f, err := os.Open(filename)
if err != nil {
return
}
song.Info = make(map[string]string)
id3info := id3.Read(f)
if id3info != nil {
song.Info["title"] = id3info.Name
song.Info["artist"] = id3info.Artist
}
song.Info["filename"] = filename
f.Close()
arguments := []string{filename}
arguments = append(arguments, soxFormat...)
arguments = append(arguments, "-")
arguments = append(arguments, soxTrim(30, 4)...)
cmd := exec.Command("sox", arguments...)
buffer := new(bytes.Buffer)
cmd.Stdout = buffer
err = cmd.Run()
if err != nil {
return Song{}, err
}
samples := make([]float64, buffer.Len())
for i, sample := range buffer.Bytes() {
samples[i] = float64(sample)
}
spectrogram := spectral.Compute(samples, 1024, 0.75)
statistics := spectrogram.Stats(22050)
features := []string{"cutoffFreq", "energyCV", "maxEnergyFreq", "maxVarFreq"}
song.Features = make([]float64, 0, len(features))
for _, stat := range features {
song.Features = append(song.Features, statistics[stat])
}
song.Features = append(song.Features, spectrogram.LogFreq...)
return
}
// MusicPick lets the user pick playlist tracks from local files
func MusicPick(inDirectory, outDirectory string, tracks Tracks) (err error) {
var id3Files []*id3.File
var filePaths []string
// Traverse all folders inside inDirectory and load all music files
walkFunc := func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
stat, err := os.Stat(path)
if err != nil {
return err
}
// We only open files
if stat.IsDir() {
return nil
}
// Only open .mp3 and .flac files
if !strings.HasSuffix(strings.ToLower(path), ".mp3") && !strings.HasSuffix(strings.ToLower(path), ".flac") {
return nil
}
// Open file
fd, err := os.Open(path)
if err != nil {
return err
}
defer fd.Close()
// Read id3
id3File := id3.Read(fd)
if id3File == nil {
errorf("could not read id3 tags\n")
return nil
}
// Add to slice
id3Files = append(id3Files, id3File)
filePaths = append(filePaths, path)
return err
}
if err = filepath.Walk(inDirectory, walkFunc); err != nil {
return
}
// Go through each track and try to find it.
for i, x := range tracks {
fmt.Fprintf(color.Output, "[%d / %d] Locating track: %s Artist: %s\n", i, len(tracks)-1, boldS(x.Name), boldS(x.ArtistName))
var matchedID3s []*id3.File
var matchedFilepaths []string
for k, y := range id3Files {
// Match algorithm
a, b := strings.ToLower(y.Artist), strings.ToLower(x.ArtistName)
if strings.Contains(a, b) || strings.Contains(b, a) {
matchedID3s = append(matchedID3s, y)
matchedFilepaths = append(matchedFilepaths, filePaths[k])
}
}
// Continue to next track if we got no results
if len(matchedID3s) < 1 {
logf("No matches\n")
continue
}
}
return
}
func getSongs() []SongRecord {
addfilechannel := make(chan SongRecord, 100)
var w sync.WaitGroup
for _, playlistRec := range IcerayCfg.Playlist {
fext := strings.ToLower(filepath.Ext(playlistRec.Path))
if fext == ".xspf" {
// process XML playlist file
} else if fext == ".m3u" {
// process m3u playlist file
} else {
w.Add(1)
go folderSearch(playlistRec.Path, playlistRec.Subdirs, addfilechannel, &w)
}
}
// wait for song search(es) to finish up
w.Wait()
close(addfilechannel)
var songs []SongRecord
for mfile := range addfilechannel {
// Read in MP3 info and save it
fd, err := os.Open(mfile.fullpath)
defer fd.Close()
if err != nil {
log.Println("Problem opening: " + mfile.fullpath)
continue
}
// Read in MP3 tags
mp3tags := id3.Read(fd)
if mp3tags == nil {
log.Println("Problems getting MP3 tags for " + mfile.fullpath)
continue
}
if mp3tags.Artist == "" {
log.Println("Artist tag missing for " + mfile.fullpath)
continue
}
if mp3tags.Name == "" {
log.Println("Song tag missing for " + mfile.fullpath)
continue
}
mfile.artist = mp3tags.Artist
mfile.title = mp3tags.Name
songs = append(songs, mfile)
}
if IcerayCfg.Music.Shuffle {
// Now (linear) shuffle it
sc := len(songs)
for i := range songs {
j := randGen.Intn(sc)
songs[i], songs[j] = songs[j], songs[i]
}
}
return songs
}