electricboogaloo/parse.go

package main

import (
	"fmt"
	"io"
	"log"
	"os"
	"path/filepath"
	"strings"

	"github.com/bogem/id3v2/v2"
	"github.com/go-flac/flacpicture"
	"github.com/go-flac/go-flac"
)

// has

func hasFlacTrackArt(s string) bool {
	// dumb check
	if !strings.HasSuffix(s, ".flac") {
		return false
	}

	//  is parsable
	f, err := flac.ParseFile(s)
	if err != nil {
		return false
	}

	// has any frames
	if len(f.Meta) == 0 {
		return false
	}

	// has any pictures
	for _, metadata := range f.Meta {
		if metadata.Type == flac.Picture {
			return true
		}
	}

	// no pictures
	return false
}

func hasMp3TrackArt(s string) bool {
	// dumb check
	if !strings.HasSuffix(s, ".mp3") {
		return false
	}

	// is parsable
	m, err := id3v2.Open(s, id3v2.Options{Parse: true})
	if err != nil {
		return false
	}
	defer m.Close()

	// has a picture
	pic := m.GetFrames(m.CommonID("Attached picture"))
	if pic != nil {
		return true
	}

	// no pictures
	return false
}

func hasCoverArtFile(s string) bool {
	exts := []string{".jpg", ".jpeg", ".png", ".gif"} // check all sane image types
	dir := filepath.Dir(s)
	file, err := os.Open(dir)
	if err != nil {
		log.Printf("can't open %v; %v\n", dir, err.Error())
		return false
	}
	defer file.Close()
	indexes, _ := file.ReadDir(0)
	for i := range indexes {
		for _, key := range exts {
			if "cover"+key == indexes[i].Name() {
				return true
			}
		}
	}

	return false
}

// get

func getFlacArt(s string) ([]byte, error) {
	f, err := flac.ParseFile(s)
	if err != nil {
		return nil, fmt.Errorf("can't open file")
	}
	for _, metadata := range f.Meta {
		if metadata.Type == flac.Picture {
			// do not care if it has multiple pictures, pick the first one.
			pic, err := flacpicture.ParseFromMetaDataBlock(*metadata)
			return pic.ImageData, err
		}
	}
	return nil, fmt.Errorf("no image found")
}

func getMP3Art(s string) ([]byte, error) {
	tags, err := id3v2.Open(s, id3v2.Options{Parse: true})
	if err != nil {
		return nil, fmt.Errorf("can't open mp3 tags")
	}
	defer tags.Close()
	pic := tags.GetFrames(tags.CommonID("Attached picture"))
	if pic != nil {
		// do not care if it has multiple pictures, pick the first one.
		return pic[0].(id3v2.PictureFrame).Picture, nil
	}
	return nil, fmt.Errorf("no image found")
}

func getCoverArtFile(s string) ([]byte, error) {
	exts := []string{".jpg", ".jpeg", ".png", ".gif"}
	dir := filepath.Dir(s)
	file, err := os.Open(dir)
	if err != nil {
		return nil, fmt.Errorf("can't open %v; %v", dir, err.Error())
	}
	defer file.Close()
	indexes, _ := file.ReadDir(0)
	for i := range indexes {
		for _, key := range exts {
			if "cover"+key == indexes[i].Name() {
				cover, err := os.Open(dir + "/" + indexes[i].Name())
				if err != nil {
					return nil, fmt.Errorf("can't open %v", indexes[i].Name())
				}
				defer cover.Close()
				if err != nil {
					return nil, fmt.Errorf("cant stat %v; %v", indexes[i].Name(), err.Error())
				}

				return io.ReadAll(cover)
			}
		}
	}
	return nil, fmt.Errorf("cover not found")
}

func getDefaultArt() ([]byte, error) {
	file, err := os.Open("default.jpg")
	if err != nil {
		return []byte{}, err
	}
	defer file.Close()
	info, err := file.Stat()
	if err != nil {
		return []byte{}, err
	}
	art := make([]byte, info.Size())

	file.Read(art)
	return art, err
}