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package audio
import (
"fmt"
"io"
"os"
"time"
"github.com/dhowden/tag"
"github.com/tcolgate/mp3"
settings "physick.ru/culture_exam/Settings"
)
type TrackMeta struct {
Name string
Author string
Album string
Location string
Duration time.Duration
}
func GenerateMetadata(fileName string) (TrackMeta, error) {
var fullPath = fmt.Sprintf("%s/%s", settings.Current.SongsLocation, fileName)
var duration, error = GetSongDuration(fullPath)
// If file doesn't exist that will be caught there
if error != nil {
return TrackMeta{}, error
}
var Artist, Title, Album, metaErr = GetInfo(fullPath)
if metaErr != nil {
return TrackMeta{}, metaErr
}
return TrackMeta {
Name: Title,
Author: Artist,
Album: Album,
Location: fullPath,
Duration: duration,
}, nil
}
func GetSongDuration(path string) (time.Duration, error) {
var file, fopenErr = os.Open(path)
if fopenErr != nil {
return time.Duration(0), fopenErr
}
defer file.Close()
var track = mp3.NewDecoder(file)
var duration time.Duration
var frame mp3.Frame
var skipped = 0
for {
var err = track.Decode(&frame, &skipped)
if err != nil {
if err == io.EOF {
break
}
return time.Duration(0), err
}
duration += frame.Duration()
}
return duration, nil
}
// Author - name - album
func GetInfo (filePath string) (string, string, string, error) {
f, err := os.Open(filePath)
if err != nil {
return "", "", "", err
}
defer f.Close()
m, err := tag.ReadFrom(f)
if err != nil {
return "", "", "", err
}
return m.Artist(), m.Title(), m.Album(), nil
}
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