chore: bump version to v0.2.11

.drone.jsonnet

@@ -8,7 +8,10 @@ local CreateRelease() = {
   settings: {
     api_key: { from_secret: 'GITEA_API_KEY' },
     base_url: 'https://git.unlock-music.dev',
-    files: 'dist/*',
+    files: [
+      'um-*.tar.gz',
+      'um-*.zip',
+    ],
     checksum: 'sha256',
     draft: true,
     title: '${DRONE_TAG}',
@@ -17,25 +20,36 @@ local CreateRelease() = {
 
 
 local StepGoBuild(GOOS, GOARCH) = {
-  local filepath = 'dist/um-%s-%s.tar.gz' % [GOOS, GOARCH],
+  local windows = GOOS == 'windows',
+  local archiveExt = if windows then 'zip' else 'tar.gz',
+  local filepath = 'dist/um-%s-%s-%s.%s' % [GOOS, GOARCH, '$(git describe --tags --always)', archiveExt],
+
+  local archive = if windows then [
+    // Ensure zip is installed
+    'command -v zip >/dev/null || (apt update && apt install -y zip)',
+    'zip -9 -j -r "%s" $DIST_DIR' % filepath,
+  ] else [
+    'tar -c -C $DIST_DIR um | gzip -9 > "%s"' % filepath,
+  ],
 
   name: 'go build %s/%s' % [GOOS, GOARCH],
   image: 'golang:1.22',
   environment: {
     GOOS: GOOS,
     GOARCH: GOARCH,
-    GOPROXY: "https://goproxy.io,direct",
+    GOPROXY: 'https://goproxy.io,direct',
   },
   commands: [
     'DIST_DIR=$(mktemp -d)',
     'go build -v -trimpath -ldflags="-w -s -X main.AppVersion=$(git describe --tags --always)" -o $DIST_DIR ./cmd/um',
     'mkdir -p dist',
-    'tar cz -f %s -C $DIST_DIR .' % filepath,
+  ] + archive,
-  ],
 };
 
 local StepUploadArtifact(GOOS, GOARCH) = {
-  local filename = 'um-%s-%s.tar.gz' % [GOOS, GOARCH],
+  local windows = GOOS == 'windows',
+  local archiveExt = if windows then 'zip' else 'tar.gz',
+  local filename = 'um-%s-%s-%s.%s' % [GOOS, GOARCH, '$(git describe --tags --always)', archiveExt],
   local filepath = 'dist/%s' % filename,
   local pkgname = '${DRONE_REPO_NAME}-build',
 
@@ -71,7 +85,7 @@ local PipelineBuild(GOOS, GOARCH, RUN_TEST) = {
              name: 'go test',
              image: 'golang:1.22',
              environment: {
-               GOPROXY: "https://goproxy.io,direct",
+               GOPROXY: 'https://goproxy.io,direct',
              },
              commands: ['go test -v ./...'],
            }] else []
@@ -100,7 +114,7 @@ local PipelineRelease() = {
       name: 'go test',
       image: 'golang:1.22',
       environment: {
-        GOPROXY: "https://goproxy.io,direct",
+        GOPROXY: 'https://goproxy.io,direct',
       },
       commands: ['go test -v ./...'],
     },
@@ -108,9 +122,17 @@ local PipelineRelease() = {
     StepGoBuild('linux', 'arm64'),
     StepGoBuild('linux', '386'),
     StepGoBuild('windows', 'amd64'),
+    StepGoBuild('windows', 'arm64'),
     StepGoBuild('windows', '386'),
     StepGoBuild('darwin', 'amd64'),
     StepGoBuild('darwin', 'arm64'),
+    {
+      name: 'prepare root',
+      image: 'golang:1.22',
+      commands: [
+        'mv dist/*.tar.gz dist/*.zip ./',
+      ],
+    },
     CreateRelease(),
   ],
   trigger: {

.drone.yml

@@ -17,7 +17,8 @@ steps:
   - go build -v -trimpath -ldflags="-w -s -X main.AppVersion=$(git describe --tags
     --always)" -o $DIST_DIR ./cmd/um
   - mkdir -p dist
-  - tar cz -f dist/um-linux-amd64.tar.gz -C $DIST_DIR .
+  - tar -c -C $DIST_DIR um | gzip -9 > "dist/um-linux-amd64-$(git describe --tags
+    --always).tar.gz"
   environment:
     GOARCH: amd64
     GOOS: linux
@@ -25,9 +26,10 @@ steps:
   image: golang:1.22
   name: go build linux/amd64
 - commands:
-  - curl --fail --include --user "um-release-bot:$GITEA_API_KEY" --upload-file "dist/um-linux-amd64.tar.gz"
+  - curl --fail --include --user "um-release-bot:$GITEA_API_KEY" --upload-file "dist/um-linux-amd64-$(git
-    "$DRONE_GITEA_SERVER/api/packages/${DRONE_REPO_NAMESPACE}/generic/${DRONE_REPO_NAME}-build/${DRONE_BUILD_NUMBER}/um-linux-amd64.tar.gz"
+    describe --tags --always).tar.gz" "$DRONE_GITEA_SERVER/api/packages/${DRONE_REPO_NAMESPACE}/generic/${DRONE_REPO_NAME}-build/${DRONE_BUILD_NUMBER}/um-linux-amd64-$(git
-  - sha256sum dist/um-linux-amd64.tar.gz
+    describe --tags --always).tar.gz"
+  - sha256sum dist/um-linux-amd64-$(git describe --tags --always).tar.gz
   - echo $DRONE_GITEA_SERVER/${DRONE_REPO_NAMESPACE}/-/packages/generic/${DRONE_REPO_NAME}-build/${DRONE_BUILD_NUMBER}
   environment:
     DRONE_GITEA_SERVER: https://git.unlock-music.dev
@@ -53,7 +55,8 @@ steps:
   - go build -v -trimpath -ldflags="-w -s -X main.AppVersion=$(git describe --tags
     --always)" -o $DIST_DIR ./cmd/um
   - mkdir -p dist
-  - tar cz -f dist/um-windows-amd64.tar.gz -C $DIST_DIR .
+  - command -v zip >/dev/null || (apt update && apt install -y zip)
+  - zip -9 -j -r "dist/um-windows-amd64-$(git describe --tags --always).zip" $DIST_DIR
   environment:
     GOARCH: amd64
     GOOS: windows
@@ -61,9 +64,10 @@ steps:
   image: golang:1.22
   name: go build windows/amd64
 - commands:
-  - curl --fail --include --user "um-release-bot:$GITEA_API_KEY" --upload-file "dist/um-windows-amd64.tar.gz"
+  - curl --fail --include --user "um-release-bot:$GITEA_API_KEY" --upload-file "dist/um-windows-amd64-$(git
-    "$DRONE_GITEA_SERVER/api/packages/${DRONE_REPO_NAMESPACE}/generic/${DRONE_REPO_NAME}-build/${DRONE_BUILD_NUMBER}/um-windows-amd64.tar.gz"
+    describe --tags --always).zip" "$DRONE_GITEA_SERVER/api/packages/${DRONE_REPO_NAMESPACE}/generic/${DRONE_REPO_NAME}-build/${DRONE_BUILD_NUMBER}/um-windows-amd64-$(git
-  - sha256sum dist/um-windows-amd64.tar.gz
+    describe --tags --always).zip"
+  - sha256sum dist/um-windows-amd64-$(git describe --tags --always).zip
   - echo $DRONE_GITEA_SERVER/${DRONE_REPO_NAMESPACE}/-/packages/generic/${DRONE_REPO_NAME}-build/${DRONE_BUILD_NUMBER}
   environment:
     DRONE_GITEA_SERVER: https://git.unlock-music.dev
@@ -89,7 +93,8 @@ steps:
   - go build -v -trimpath -ldflags="-w -s -X main.AppVersion=$(git describe --tags
     --always)" -o $DIST_DIR ./cmd/um
   - mkdir -p dist
-  - tar cz -f dist/um-darwin-amd64.tar.gz -C $DIST_DIR .
+  - tar -c -C $DIST_DIR um | gzip -9 > "dist/um-darwin-amd64-$(git describe --tags
+    --always).tar.gz"
   environment:
     GOARCH: amd64
     GOOS: darwin
@@ -97,9 +102,10 @@ steps:
   image: golang:1.22
   name: go build darwin/amd64
 - commands:
-  - curl --fail --include --user "um-release-bot:$GITEA_API_KEY" --upload-file "dist/um-darwin-amd64.tar.gz"
+  - curl --fail --include --user "um-release-bot:$GITEA_API_KEY" --upload-file "dist/um-darwin-amd64-$(git
-    "$DRONE_GITEA_SERVER/api/packages/${DRONE_REPO_NAMESPACE}/generic/${DRONE_REPO_NAME}-build/${DRONE_BUILD_NUMBER}/um-darwin-amd64.tar.gz"
+    describe --tags --always).tar.gz" "$DRONE_GITEA_SERVER/api/packages/${DRONE_REPO_NAMESPACE}/generic/${DRONE_REPO_NAME}-build/${DRONE_BUILD_NUMBER}/um-darwin-amd64-$(git
-  - sha256sum dist/um-darwin-amd64.tar.gz
+    describe --tags --always).tar.gz"
+  - sha256sum dist/um-darwin-amd64-$(git describe --tags --always).tar.gz
   - echo $DRONE_GITEA_SERVER/${DRONE_REPO_NAMESPACE}/-/packages/generic/${DRONE_REPO_NAME}-build/${DRONE_BUILD_NUMBER}
   environment:
     DRONE_GITEA_SERVER: https://git.unlock-music.dev
@@ -131,7 +137,8 @@ steps:
   - go build -v -trimpath -ldflags="-w -s -X main.AppVersion=$(git describe --tags
     --always)" -o $DIST_DIR ./cmd/um
   - mkdir -p dist
-  - tar cz -f dist/um-linux-amd64.tar.gz -C $DIST_DIR .
+  - tar -c -C $DIST_DIR um | gzip -9 > "dist/um-linux-amd64-$(git describe --tags
+    --always).tar.gz"
   environment:
     GOARCH: amd64
     GOOS: linux
@@ -143,7 +150,8 @@ steps:
   - go build -v -trimpath -ldflags="-w -s -X main.AppVersion=$(git describe --tags
     --always)" -o $DIST_DIR ./cmd/um
   - mkdir -p dist
-  - tar cz -f dist/um-linux-arm64.tar.gz -C $DIST_DIR .
+  - tar -c -C $DIST_DIR um | gzip -9 > "dist/um-linux-arm64-$(git describe --tags
+    --always).tar.gz"
   environment:
     GOARCH: arm64
     GOOS: linux
@@ -155,7 +163,7 @@ steps:
   - go build -v -trimpath -ldflags="-w -s -X main.AppVersion=$(git describe --tags
     --always)" -o $DIST_DIR ./cmd/um
   - mkdir -p dist
-  - tar cz -f dist/um-linux-386.tar.gz -C $DIST_DIR .
+  - tar -c -C $DIST_DIR um | gzip -9 > "dist/um-linux-386-$(git describe --tags --always).tar.gz"
   environment:
     GOARCH: "386"
     GOOS: linux
@@ -167,7 +175,8 @@ steps:
   - go build -v -trimpath -ldflags="-w -s -X main.AppVersion=$(git describe --tags
     --always)" -o $DIST_DIR ./cmd/um
   - mkdir -p dist
-  - tar cz -f dist/um-windows-amd64.tar.gz -C $DIST_DIR .
+  - command -v zip >/dev/null || (apt update && apt install -y zip)
+  - zip -9 -j -r "dist/um-windows-amd64-$(git describe --tags --always).zip" $DIST_DIR
   environment:
     GOARCH: amd64
     GOOS: windows
@@ -179,7 +188,21 @@ steps:
   - go build -v -trimpath -ldflags="-w -s -X main.AppVersion=$(git describe --tags
     --always)" -o $DIST_DIR ./cmd/um
   - mkdir -p dist
-  - tar cz -f dist/um-windows-386.tar.gz -C $DIST_DIR .
+  - command -v zip >/dev/null || (apt update && apt install -y zip)
+  - zip -9 -j -r "dist/um-windows-arm64-$(git describe --tags --always).zip" $DIST_DIR
+  environment:
+    GOARCH: arm64
+    GOOS: windows
+    GOPROXY: https://goproxy.io,direct
+  image: golang:1.22
+  name: go build windows/arm64
+- commands:
+  - DIST_DIR=$(mktemp -d)
+  - go build -v -trimpath -ldflags="-w -s -X main.AppVersion=$(git describe --tags
+    --always)" -o $DIST_DIR ./cmd/um
+  - mkdir -p dist
+  - command -v zip >/dev/null || (apt update && apt install -y zip)
+  - zip -9 -j -r "dist/um-windows-386-$(git describe --tags --always).zip" $DIST_DIR
   environment:
     GOARCH: "386"
     GOOS: windows
@@ -191,7 +214,8 @@ steps:
   - go build -v -trimpath -ldflags="-w -s -X main.AppVersion=$(git describe --tags
     --always)" -o $DIST_DIR ./cmd/um
   - mkdir -p dist
-  - tar cz -f dist/um-darwin-amd64.tar.gz -C $DIST_DIR .
+  - tar -c -C $DIST_DIR um | gzip -9 > "dist/um-darwin-amd64-$(git describe --tags
+    --always).tar.gz"
   environment:
     GOARCH: amd64
     GOOS: darwin
@@ -203,13 +227,18 @@ steps:
   - go build -v -trimpath -ldflags="-w -s -X main.AppVersion=$(git describe --tags
     --always)" -o $DIST_DIR ./cmd/um
   - mkdir -p dist
-  - tar cz -f dist/um-darwin-arm64.tar.gz -C $DIST_DIR .
+  - tar -c -C $DIST_DIR um | gzip -9 > "dist/um-darwin-arm64-$(git describe --tags
+    --always).tar.gz"
   environment:
     GOARCH: arm64
     GOOS: darwin
     GOPROXY: https://goproxy.io,direct
   image: golang:1.22
   name: go build darwin/arm64
+- commands:
+  - mv dist/*.tar.gz dist/*.zip ./
+  image: golang:1.22
+  name: prepare root
 - image: plugins/gitea-release
   name: create release
   settings:
@@ -218,7 +247,9 @@ steps:
     base_url: https://git.unlock-music.dev
     checksum: sha256
     draft: true
-    files: dist/*
+    files:
+    - um-*.tar.gz
+    - um-*.zip
     title: ${DRONE_TAG}
 trigger:
   event:

.gitignore

@@ -2,3 +2,6 @@
 
 /dist
 *.exe
+
+/um-*.tar.gz
+/um-*.zip

README.md

@@ -6,6 +6,9 @@ Original: Web Edition https://git.unlock-music.dev/um/web
 - [Release Download](https://git.unlock-music.dev/um/cli/releases/latest)
 - [Latest Build](https://git.unlock-music.dev/um/-/packages/generic/cli-build/)
 
+> **WARNING**
+> 在本站 fork 不会起到备份的作用，只会浪费服务器储存空间。如无必要请勿 fork 该仓库。
+
 ## Features
 
 - [x] All Algorithm Supported By `unlock-music/web`
@@ -22,3 +25,13 @@ Original: Web Edition https://git.unlock-music.dev/um/web
 - Drag the encrypted file to `um.exe` (Tested on Windows)
 - Run: `./um [-o <output dir>] [-i] <input dir/file>`
 - Use `./um -h` to show help menu
+
+## Update CI pipeline
+
+1. Install [Drone CI binary](https://docs.drone.io/cli/install/)
+2. Edit `.drone.jsonnet`
+3. Update drone CI pipeline:
+
+   ```sh
+   drone jsonnet --format --stream
+   ```

algo/common/dispatch.go

@@ -18,25 +18,32 @@ type DecoderParams struct {
 }
 type NewDecoderFunc func(p *DecoderParams) Decoder
 
-type decoderItem struct {
+type DecoderFactory struct {
-	noop    bool
+	noop   bool
-	decoder NewDecoderFunc
+	Suffix string
+	Create NewDecoderFunc
 }
 
-var DecoderRegistry = make(map[string][]decoderItem)
+var DecoderRegistry []DecoderFactory
 
 func RegisterDecoder(ext string, noop bool, dispatchFunc NewDecoderFunc) {
-	DecoderRegistry[ext] = append(DecoderRegistry[ext],
+	DecoderRegistry = append(DecoderRegistry,
-		decoderItem{noop: noop, decoder: dispatchFunc})
+		DecoderFactory{noop: noop, Create: dispatchFunc, Suffix: "." + strings.TrimPrefix(ext, ".")})
 }
 
-func GetDecoder(filename string, skipNoop bool) (rs []NewDecoderFunc) {
+func GetDecoder(filename string, skipNoop bool) []DecoderFactory {
-	ext := strings.ToLower(strings.TrimLeft(filepath.Ext(filename), "."))
+	var result []DecoderFactory
-	for _, dec := range DecoderRegistry[ext] {
+	// Some extensions contains multiple dots, e.g. ".kgm.flac", hence iterate
+	//   all decoders for each extension.
+	name := strings.ToLower(filepath.Base(filename))
+	for _, dec := range DecoderRegistry {
+		if !strings.HasSuffix(name, dec.Suffix) {
+			continue
+		}
 		if skipNoop && dec.noop {
 			continue
 		}
-		rs = append(rs, dec.decoder)
+		result = append(result, dec)
 	}
-	return
+	return result
 }

algo/kgm/kgm.go

@@ -61,4 +61,7 @@ func init() {
 	common.RegisterDecoder("kgma", false, NewDecoder)
 	// Viper
 	common.RegisterDecoder("vpr", false, NewDecoder)
+	// Kugou Android
+	common.RegisterDecoder("kgm.flac", false, NewDecoder)
+	common.RegisterDecoder("vpr.flac", false, NewDecoder)
 }

algo/ncm/meta.go

@@ -1,6 +1,7 @@
 package ncm
 
 import (
+	"go.uber.org/zap"
 	"strings"
 
 	"unlock-music.dev/cli/algo/common"
@@ -17,33 +18,49 @@ type ncmMeta interface {
 }
 
 type ncmMetaMusic struct {
-	Format        string          `json:"format"`
+	logger *zap.Logger
-	MusicName     string          `json:"musicName"`
+
-	Artist        [][]interface{} `json:"artist"`
+	Format        string        `json:"format"`
-	Album         string          `json:"album"`
+	MusicName     string        `json:"musicName"`
-	AlbumPicDocID interface{}     `json:"albumPicDocId"`
+	Artist        interface{}   `json:"artist"`
-	AlbumPic      string          `json:"albumPic"`
+	Album         string        `json:"album"`
-	Flag          int             `json:"flag"`
+	AlbumPicDocID interface{}   `json:"albumPicDocId"`
-	Bitrate       int             `json:"bitrate"`
+	AlbumPic      string        `json:"albumPic"`
-	Duration      int             `json:"duration"`
+	Flag          int           `json:"flag"`
-	Alias         []interface{}   `json:"alias"`
+	Bitrate       int           `json:"bitrate"`
-	TransNames    []interface{}   `json:"transNames"`
+	Duration      int           `json:"duration"`
+	Alias         []interface{} `json:"alias"`
+	TransNames    []interface{} `json:"transNames"`
+}
+
+func newNcmMetaMusic(logger *zap.Logger) *ncmMetaMusic {
+	ncm := new(ncmMetaMusic)
+	ncm.logger = logger.With(zap.String("module", "ncmMetaMusic"))
+	return ncm
 }
 
 func (m *ncmMetaMusic) GetAlbumImageURL() string {
 	return m.AlbumPic
 }
 
-func (m *ncmMetaMusic) GetArtists() (artists []string) {
+func (m *ncmMetaMusic) GetArtists() []string {
-	for _, artist := range m.Artist {
+	m.logger.Debug("ncm artists", zap.Any("artists", m.Artist))
-		for _, item := range artist {
+
-			name, ok := item.(string)
+	var artists []string = nil
-			if ok {
+	if jsonArtists, ok := m.Artist.([][]string); ok {
+		for _, artist := range jsonArtists {
+			for _, name := range artist {
 				artists = append(artists, name)
 			}
 		}
+	} else if artist, ok := m.Artist.(string); ok {
+		// #78: artist is a string type.
+		// https://git.unlock-music.dev/um/cli/issues/78
+		artists = []string{artist}
+	} else {
+		m.logger.Warn("unexpected artist type", zap.Any("artists", m.Artist))
 	}
-	return
+	return artists
 }
 
 func (m *ncmMetaMusic) GetTitle() string {

algo/ncm/ncm.go

@@ -8,6 +8,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"go.uber.org/zap"
 	"io"
 	"net/http"
 	"strings"
@@ -30,11 +31,12 @@ var (
 )
 
 func NewDecoder(p *common.DecoderParams) common.Decoder {
-	return &Decoder{rd: p.Reader}
+	return &Decoder{rd: p.Reader, logger: p.Logger.With(zap.String("module", "ncm"))}
 }
 
 type Decoder struct {
-	rd io.ReadSeeker // rd is the original file reader
+	logger *zap.Logger
+	rd     io.ReadSeeker // rd is the original file reader
 
 	offset int
 	cipher common.StreamDecoder
@@ -74,7 +76,7 @@ func (d *Decoder) Validate() error {
 	}
 
 	if err := d.parseMeta(); err != nil {
-		return fmt.Errorf("parse meta failed: %w", err)
+		return fmt.Errorf("parse meta failed: %w (raw json=%s)", err, string(d.metaRaw))
 	}
 
 	d.cipher = newNcmCipher(keyData)
@@ -181,7 +183,7 @@ func (d *Decoder) readCoverData() error {
 func (d *Decoder) parseMeta() error {
 	switch d.metaType {
 	case "music":
-		d.meta = new(ncmMetaMusic)
+		d.meta = newNcmMetaMusic(d.logger)
 		return json.Unmarshal(d.metaRaw, d.meta)
 	case "dj":
 		d.meta = new(ncmMetaDJ)

cmd/um/main.go

@@ -5,21 +5,19 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"github.com/fsnotify/fsnotify"
+	"github.com/urfave/cli/v2"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
 	"io"
 	"os"
 	"os/signal"
-	"path"
 	"path/filepath"
 	"runtime"
 	"runtime/debug"
 	"sort"
 	"strings"
 	"time"
-
-	"github.com/fsnotify/fsnotify"
-	"github.com/urfave/cli/v2"
-	"go.uber.org/zap"
-
 	"unlock-music.dev/cli/algo/common"
 	_ "unlock-music.dev/cli/algo/kgm"
 	_ "unlock-music.dev/cli/algo/kwm"
@@ -29,14 +27,13 @@ import (
 	_ "unlock-music.dev/cli/algo/xiami"
 	_ "unlock-music.dev/cli/algo/ximalaya"
 	"unlock-music.dev/cli/internal/ffmpeg"
-	"unlock-music.dev/cli/internal/logging"
 	"unlock-music.dev/cli/internal/sniff"
 	"unlock-music.dev/cli/internal/utils"
 )
 
-var AppVersion = "v0.2.3"
+var AppVersion = "v0.2.11"
 
-var logger, _ = logging.NewZapLogger() // TODO: inject logger to application, instead of using global logger
+var logger = setupLogger(false) // TODO: inject logger to application, instead of using global logger
 
 func main() {
 	module, ok := debug.ReadBuildInfo()
@@ -55,6 +52,7 @@ func main() {
 			&cli.StringFlag{Name: "qmc-mmkv-key", Aliases: []string{"key"}, Usage: "mmkv password (16 ascii chars)", Required: false},
 			&cli.BoolFlag{Name: "remove-source", Aliases: []string{"rs"}, Usage: "remove source file", Required: false, Value: false},
 			&cli.BoolFlag{Name: "skip-noop", Aliases: []string{"n"}, Usage: "skip noop decoder", Required: false, Value: true},
+			&cli.BoolFlag{Name: "verbose", Aliases: []string{"V"}, Usage: "verbose logging", Required: false, Value: false},
 			&cli.BoolFlag{Name: "update-metadata", Usage: "update metadata & album art from network", Required: false, Value: false},
 			&cli.BoolFlag{Name: "overwrite", Usage: "overwrite output file without asking", Required: false, Value: false},
 			&cli.BoolFlag{Name: "watch", Usage: "watch the input dir and process new files", Required: false, Value: false},
@@ -67,6 +65,7 @@ func main() {
 		HideHelpCommand: true,
 		UsageText:       "um [-o /path/to/output/dir] [--extra-flags] [-i] /path/to/input",
 	}
+
 	err := app.Run(os.Args)
 	if err != nil {
 		logger.Fatal("run app failed", zap.Error(err))
@@ -75,16 +74,45 @@ func main() {
 
 func printSupportedExtensions() {
 	var exts []string
-	for ext := range common.DecoderRegistry {
+	extSet := make(map[string]int)
+	for _, factory := range common.DecoderRegistry {
+		ext := strings.TrimPrefix(factory.Suffix, ".")
+		if n, ok := extSet[ext]; ok {
+			extSet[ext] = n + 1
+		} else {
+			extSet[ext] = 1
+		}
+	}
+	for ext := range extSet {
 		exts = append(exts, ext)
 	}
 	sort.Strings(exts)
 	for _, ext := range exts {
-		fmt.Printf("%s: %d\n", ext, len(common.DecoderRegistry[ext]))
+		fmt.Printf("%s: %d\n", ext, extSet[ext])
 	}
 }
 
+func setupLogger(verbose bool) *zap.Logger {
+	logConfig := zap.NewProductionEncoderConfig()
+	logConfig.EncodeLevel = zapcore.CapitalColorLevelEncoder
+	logConfig.EncodeTime = zapcore.RFC3339TimeEncoder
+	enabler := zap.LevelEnablerFunc(func(level zapcore.Level) bool {
+		if verbose {
+			return true
+		}
+		return level >= zapcore.InfoLevel
+	})
+
+	return zap.New(zapcore.NewCore(
+		zapcore.NewConsoleEncoder(logConfig),
+		os.Stdout,
+		enabler,
+	))
+}
+
 func appMain(c *cli.Context) (err error) {
+	logger = setupLogger(c.Bool("verbose"))
+
 	cwd, err := os.Getwd()
 	if err != nil {
 		return err
@@ -106,20 +134,33 @@ func appMain(c *cli.Context) (err error) {
 		}
 	}
 
+	input, absErr := filepath.Abs(input)
+	if absErr != nil {
+		return fmt.Errorf("get abs path failed: %w", absErr)
+	}
+
 	output := c.String("output")
 	inputStat, err := os.Stat(input)
 	if err != nil {
 		return err
 	}
 
-	if output == "" {
+	var inputDir string
-		// Default to where the input is
+	if inputStat.IsDir() {
-		if inputStat.IsDir() {
+		inputDir = input
-			output = input
+	} else {
-		} else {
+		inputDir = filepath.Dir(input)
-			output = path.Dir(input)
-		}
 	}
+	inputDir, absErr = filepath.Abs(inputDir)
+	if absErr != nil {
+		return fmt.Errorf("get abs path (inputDir) failed: %w", absErr)
+	}
+
+	if output == "" {
+		// Default to where the input dir is
+		output = inputDir
+	}
+	logger.Debug("resolve input/output path", zap.String("inputDir", inputDir), zap.String("input", input), zap.String("output", output))
 
 	outputStat, err := os.Stat(output)
 	if err != nil {
@@ -143,7 +184,8 @@ func appMain(c *cli.Context) (err error) {
 	}
 
 	proc := &processor{
-		inputDir:        input,
+		logger:          logger,
+		inputDir:        inputDir,
 		outputDir:       output,
 		skipNoopDecoder: c.Bool("skip-noop"),
 		removeSource:    c.Bool("remove-source"),
@@ -165,6 +207,7 @@ func appMain(c *cli.Context) (err error) {
 }
 
 type processor struct {
+	logger    *zap.Logger
 	inputDir  string
 	outputDir string
 
@@ -256,6 +299,8 @@ func (p *processor) processDir(inputDir string) error {
 }
 
 func (p *processor) processFile(filePath string) error {
+	p.logger.Debug("processFile", zap.String("file", filePath), zap.String("inputDir", p.inputDir))
+
 	allDec := common.GetDecoder(filePath, p.skipNoopDecoder)
 	if len(allDec) == 0 {
 		return errors.New("skipping while no suitable decoder")
@@ -276,7 +321,19 @@ func (p *processor) processFile(filePath string) error {
 	return nil
 }
 
-func (p *processor) process(inputFile string, allDec []common.NewDecoderFunc) error {
+func (p *processor) findDecoder(decoders []common.DecoderFactory, params *common.DecoderParams) (*common.Decoder, *common.DecoderFactory, error) {
+	for _, factory := range decoders {
+		dec := factory.Create(params)
+		err := dec.Validate()
+		if err == nil {
+			return &dec, &factory, nil
+		}
+		logger.Warn("try decode failed", zap.Error(err))
+	}
+	return nil, nil, errors.New("no any decoder can resolve the file")
+}
+
+func (p *processor) process(inputFile string, allDec []common.DecoderFactory) error {
 	file, err := os.Open(inputFile)
 	if err != nil {
 		return err
@@ -284,26 +341,16 @@ func (p *processor) process(inputFile string, allDec []common.NewDecoderFunc) er
 	defer file.Close()
 	logger := logger.With(zap.String("source", inputFile))
 
-	decParams := &common.DecoderParams{
+	pDec, decoderFactory, err := p.findDecoder(allDec, &common.DecoderParams{
 		Reader:    file,
 		Extension: filepath.Ext(inputFile),
 		FilePath:  inputFile,
 		Logger:    logger,
+	})
+	if err != nil {
+		return err
 	}
-
+	dec := *pDec
-	var dec common.Decoder
-	for _, decFunc := range allDec {
-		dec = decFunc(decParams)
-		if err := dec.Validate(); err == nil {
-			break
-		} else {
-			logger.Warn("try decode failed", zap.Error(err))
-			dec = nil
-		}
-	}
-	if dec == nil {
-		return errors.New("no any decoder can resolve the file")
-	}
 
 	params := &ffmpeg.UpdateMetadataParams{}
 
@@ -365,13 +412,14 @@ func (p *processor) process(inputFile string, allDec []common.NewDecoderFunc) er
 		return fmt.Errorf("get relative dir failed: %w", err)
 	}
 
-	inFilename := strings.TrimSuffix(filepath.Base(inputFile), filepath.Ext(inputFile))
+	inFilename := strings.TrimSuffix(filepath.Base(inputFile), decoderFactory.Suffix)
 	outPath := filepath.Join(p.outputDir, inputRelDir, inFilename+params.AudioExt)
 
 	if !p.overwriteOutput {
 		_, err := os.Stat(outPath)
 		if err == nil {
-			return fmt.Errorf("output file %s is already exist", outPath)
+			logger.Warn("output file already exist, skip", zap.String("destination", outPath))
+			return nil
 		} else if !errors.Is(err, os.ErrNotExist) {
 			return fmt.Errorf("stat output file failed: %w", err)
 		}
@@ -391,7 +439,7 @@ func (p *processor) process(inputFile string, allDec []common.NewDecoderFunc) er
 		ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
 		defer cancel()
 
-		if err := ffmpeg.UpdateMeta(ctx, outPath, params); err != nil {
+		if err := ffmpeg.UpdateMeta(ctx, outPath, params, logger); err != nil {
 			return err
 		}
 	}

internal/ffmpeg/ffmpeg.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
+	"go.uber.org/zap"
 	"io"
 	"os"
 	"os/exec"
@@ -43,9 +44,9 @@ type UpdateMetadataParams struct {
 	AlbumArtExt string // required if AlbumArt is not nil
 }
 
-func UpdateMeta(ctx context.Context, outPath string, params *UpdateMetadataParams) error {
+func UpdateMeta(ctx context.Context, outPath string, params *UpdateMetadataParams, logger *zap.Logger) error {
 	if params.AudioExt == ".flac" {
-		return updateMetaFlac(ctx, outPath, params)
+		return updateMetaFlac(ctx, outPath, params, logger.With(zap.String("module", "updateMetaFlac")))
 	} else {
 		return updateMetaFFmpeg(ctx, outPath, params)
 	}

internal/ffmpeg/meta_flac.go

@@ -2,6 +2,7 @@ package ffmpeg
 
 import (
 	"context"
+	"go.uber.org/zap"
 	"mime"
 	"strings"
 
@@ -11,7 +12,7 @@ import (
 	"golang.org/x/exp/slices"
 )
 
-func updateMetaFlac(_ context.Context, outPath string, m *UpdateMetadataParams) error {
+func updateMetaFlac(_ context.Context, outPath string, m *UpdateMetadataParams, logger *zap.Logger) error {
 	f, err := flac.ParseFile(m.Audio)
 	if err != nil {
 		return err
@@ -62,27 +63,30 @@ func updateMetaFlac(_ context.Context, outPath string, m *UpdateMetadataParams)
 	}
 
 	if m.AlbumArt != nil {
-
+		coverMime := mime.TypeByExtension(m.AlbumArtExt)
+		logger.Debug("cover image mime detect", zap.String("mime", coverMime))
 		cover, err := flacpicture.NewFromImageData(
 			flacpicture.PictureTypeFrontCover,
 			"Front cover",
 			m.AlbumArt,
-			mime.TypeByExtension(m.AlbumArtExt),
+			coverMime,
 		)
-		if err != nil {
-			return err
-		}
-		coverBlock := cover.Marshal()
-		f.Meta = append(f.Meta, &coverBlock)
 
-		// add / replace flac cover
+		if err != nil {
-		coverIdx := slices.IndexFunc(f.Meta, func(b *flac.MetaDataBlock) bool {
+			logger.Warn("failed to create flac cover", zap.Error(err))
-			return b.Type == flac.Picture
-		})
-		if coverIdx < 0 {
-			f.Meta = append(f.Meta, &coverBlock)
 		} else {
-			f.Meta[coverIdx] = &coverBlock
+			coverBlock := cover.Marshal()
+			f.Meta = append(f.Meta, &coverBlock)
+
+			// add / replace flac cover
+			coverIdx := slices.IndexFunc(f.Meta, func(b *flac.MetaDataBlock) bool {
+				return b.Type == flac.Picture
+			})
+			if coverIdx < 0 {
+				f.Meta = append(f.Meta, &coverBlock)
+			} else {
+				f.Meta[coverIdx] = &coverBlock
+			}
 		}
 	}