fix(#7): set default value for qmc-android-db flag to empty and adjust loading logic to use current directory's player_process_db if not specified

.cursor/rules/um-cli.mdc

@@ -0,0 +1,13 @@
+---
+description: um-cli (Unlock Music CLI) project conventions for agents
+alwaysApply: true
+---
+
+# um-cli
+
+- Module: `git.um-react.app/um/cli`. Entry: `cmd/um/main.go`. Read `AGENTS.md` before structural changes.
+- Decoders live under `algo/<vendor>/`, register via `common.RegisterDecoder` in `init()`, blank-import new packages from `cmd/um`.
+- Shared non-algo code goes in `internal/`. Pass secrets through `common.CryptoParams`, not globals.
+- Soft-fail optional key loaders (`Warn`); hard-fail only when decrypt cannot proceed. Normalize QMC map keys with `utils.NormalizeUnicode`.
+- OS-specific code: `*_windows.go` / `*_darwin.go` or explicit `//go:build` stubs (see QMC MMKV loaders, `pc_kugou_db`).
+- After flag or Go-version changes, update `README.md`. Keep changes minimal; run `go test ./...` for touched packages.

AGENTS.md

@@ -0,0 +1,141 @@
+# Agent guide — um-cli
+
+Unlock Music CLI (`um`): decrypt vendor-locked audio files to raw streams, optionally rewrite tags/cover with ffmpeg.
+
+Module path: `git.um-react.app/um/cli`  
+Entry point: `cmd/um/main.go`
+
+## Quick commands
+
+```bash
+go test ./...
+go build -o um ./cmd/um
+./um -h
+./um --supported-ext
+```
+
+CI (`.gitea/workflows/build.yml`): `go test ./...` then cross-build `linux|windows|darwin` × `amd64|arm64`, `CGO_ENABLED=0`, Go `^1.25`.
+
+Optional runtime deps (not needed to compile):
+
+- `ffmpeg` / `ffprobe` — only when `--update-metadata` is set
+- Windows: `qmpc-mmkv-cli.exe` for automatic QMC keys
+- Windows: KuGou `KGMusicV3.db` for `.kgg` (KGMv5)
+
+## Layout
+
+```
+cmd/um/          CLI flags, directory walk / watch, decode → write pipeline
+algo/
+  common/        Decoder interfaces, registry, raw “noop” passthrough, CryptoParams
+  ncm/ kgm/ kwm/ qmc/ tm/ xiami/ ximalaya/   one package per format family
+internal/
+  ffmpeg/        metadata + album art via ffmpeg/ffprobe
+  mmkv/          MMKV file read + QMCKeys merge/normalize
+  sniff/         audio/image magic → extension
+  utils/         crypto helpers, temp files, unicode normalize
+  logging/       zap helpers (mostly unused; logger still global in main)
+misc/            release/repack scripts
+```
+
+Do not invent new top-level packages; put shared non-algo code under `internal/`.
+
+## Architecture (decode path)
+
+1. `main` resolves input/output, loads crypto side-data into `common.CryptoParams`.
+2. `common.GetDecoder(path, skipNoop)` matches **filename suffix** (lowercased base name; multi-dot suffixes like `.kgm.flac` supported).
+3. For each matching `DecoderFactory`, `Create` → `Validate()`. First success wins.
+4. Decrypted bytes are read via `io.Reader`; first 64 bytes sniffed for output extension.
+5. Without `--update-metadata`: stream copy to output. With it: optional `AudioMetaGetter` / `CoverImageGetter`, then `ffmpeg.UpdateMeta`.
+
+Key types (`algo/common/interface.go`):
+
+- `Decoder` — `Validate() error` + `io.Reader`
+- `StreamDecoder` — `Decrypt(buf []byte, offset int)` for stream ciphers
+- `AudioMetaGetter` / `CoverImageGetter` — optional, used only with `--update-metadata`
+
+Registration (`algo/common/dispatch.go`):
+
+```go
+func init() {
+    common.RegisterDecoder("ext", false /* noop */, NewDecoder)
+}
+```
+
+Format packages are blank-imported from `cmd/um/main.go` so `init()` runs. New format packages **must** be blank-imported there.
+
+`noop == true` means “looks like plaintext audio” (see `algo/common/raw.go`). Default CLI skips them (`--skip-noop` defaults true).
+
+## CryptoParams / keys
+
+```go
+type CryptoParams struct {
+    KggDbPath string      // KuGou KGMv5
+    QmcKeys   QMCKeys     // map[normalizedName]ekey
+}
+```
+
+QMC key merge order in `appMain` (later maps overwrite earlier on same key):
+
+1. `qmc.LoadMMKVOrDefault` — **platform build tags**
+   - `key_mmkv_loader_darwin.go` — QQ Music Mac v8 / v10
+   - `key_mmkv_loader_windows.go` — runs `qmpc-mmkv-cli`
+   - `key_mmkv_loader_default.go` — other OS: empty
+2. `qmc.LoadUserMMKV(--qmc-mmkv, --qmc-mmkv-key)` — soft-fail
+3. `qmc.LoadAndroidDB(--qmc-android-db)` — soft-fail; tables `audio_file_ekey_table` or `EKeyFileInfo`
+
+Always normalize map keys/values with `internal/utils.NormalizeUnicode` (NFC) when adding loaders.
+
+KGG: `algo/kgm/pc_kugou_db` — real decrypt in `cipher_windows.go` (filename build constraint); stub on `!windows`.
+
+## Adding or changing a decoder
+
+1. Prefer extending an existing `algo/<vendor>` package over a new top-level package.
+2. Implement `Validate` (seek/parse headers, init cipher) then `Read` (decrypt in place with absolute offset).
+3. Register every real-world extension in `init()`; QMC already lists many aliases (Weiyun hex names, `mflac*` / `mgg*` suffixes).
+4. Blank-import the package from `cmd/um` if new.
+5. Pass secrets only via `DecoderParams.CryptoParams`, never globals.
+6. Soft-fail optional key sources with `logger.Warn`; hard-fail only when decrypt cannot proceed.
+7. Add `_test.go` next to the cipher/loader you touch; keep fixtures small.
+
+Optional metadata: implement `AudioMetaGetter` / `CoverImageGetter` on the same decoder type.
+
+## Platform / build tags
+
+| Pattern | Purpose |
+|---------|---------|
+| `*_darwin.go` / `*_windows.go` | OS-specific implementations |
+| `//go:build !windows` etc. | Explicit stubs |
+| `algo/qmc/qmmac/` | macOS QQ Music MMKV helpers |
+
+Do not call Windows-only or Darwin-only APIs from untagged files. Prefer stub + real file pairs over runtime `GOOS` switches when the whole API is unavailable.
+
+## Conventions
+
+- Errors: wrap with `%w` and a short package prefix (`qmc init cipher:`, `kgm v5:`).
+- Logging: `*zap.Logger` from `DecoderParams.Logger` inside algo code; CLI still uses a package-level logger in `main` (do not expand that pattern).
+- No new dependencies without need; prefer stdlib + existing modules (`urfave/cli/v2`, `zap`, `go-mmkv`, `modernc.org/sqlite`).
+- Do not commit built binaries (`/um`, `*.exe` — see `.gitignore`).
+- User-facing docs: keep `README.md` accurate when changing flags or Go version; keep `CHANGELOG.md` under `[Unreleased]` for notable behavior changes.
+- Scope: this repo is the CLI only; crypto shared with web may live in sibling `um` projects — do not assume web TS sources are present here.
+
+## Useful file map
+
+| Task | Start here |
+|------|------------|
+| CLI flags / pipeline | `cmd/um/main.go` |
+| Register / dispatch | `algo/common/dispatch.go`, `interface.go` |
+| QMC decrypt / footer | `algo/qmc/qmc.go`, `key_derive.go`, `cipher_*.go` |
+| QMC keys | `algo/qmc/key_mmkv_loader*.go`, `key_android_db_loader.go` |
+| KGM / KGG | `algo/kgm/`, `algo/kgm/pc_kugou_db/` |
+| NCM | `algo/ncm/` |
+| Metadata rewrite | `internal/ffmpeg/` |
+
+## Tests
+
+```bash
+go test ./algo/qmc/ -count=1
+go test ./... -count=1
+```
+
+Prefer table-driven tests; avoid network in unit tests. Platform-specific tests may no-op or skip off-target OS.

CHANGELOG.md

@@ -7,10 +7,29 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-## [v0.2.18] - 2025-09-15
+## [v0.2.20] - 2026-10-18
+
+### Added
+
+- [#2] Support `.mflac2` / `.mgg2` extensions.
+- [#7] Load QMC ekeys from QQ Music Android `player_process_db` (`--qmc-android-db`).
+- [#8] Windows: auto-fetch QMC keys via `qmpc-mmkv-cli` (`--qmpc-mmkv-cli-exe`).
 
 ### Changed
-- Fix `musicex\0` tag parsing.
+
+- [#8] User MMKV (`--qmc-mmkv`) now merges with platform default keys on all OSes.
+
+## [v0.2.19] - 2025-11-26
+
+### Fixed
+- MMKV parsing: Handle cases where MMKV value is empty.
+
+## [v0.2.18] - 2025-11-16
+
+### Changed
+- QMC2: Fix `musicex\0` tag parsing.
+- MMKV: Improved tolerance for corrupted MMKV file parsing.
+- Updated project dependencies.
 
 ## [v0.2.17] - 2025-09-09 ⚠️ **(Broken Release)**
 
@@ -71,3 +90,8 @@ git log --oneline --before="2024-11-05"
 ```
 
 Or view the complete commit history on the project repository for detailed information about features, fixes, and improvements in previous releases.
+
+[#2]: https://git.um-react.app/um/cli/pulls/2
+[#7]: https://git.um-react.app/um/cli/pulls/7
+[#8]: https://git.um-react.app/um/cli/pulls/8
+[v0.2.20]: https://git.um-react.app/um/cli/releases/tag/v0.2.20

README.md

@@ -11,8 +11,11 @@ Original: Web Edition https://git.um-react.app/um/web
 
 ## Features
 
-- [x] All Algorithm Supported By `unlock-music/web`
-- [x] Complete Metadata & Cover Image
+- Decrypt formats supported by `unlock-music/web` (NCM, QMC/MGG/MFLAC, KGM/KGG, KWM, XM, Ximalaya, TM, …)
+- Optional network metadata & cover update via `--update-metadata` (requires `ffmpeg` / `ffprobe` on `PATH`)
+- Directory watch mode (`--watch`), overwrite / remove-source helpers
+- QMC ekey loaders: platform defaults (macOS / Windows), user MMKV, Android `player_process_db`
+- KGG (KGMv5) on Windows via KuGou `KGMusicV3.db`
 
 ## Release
 
@@ -20,19 +23,43 @@ Original: Web Edition https://git.um-react.app/um/web
 
 ## Install from source
 
-- Requirements: **Golang 1.23.3**
+- Requirements: **Go 1.25+** (see `go.mod`)
 
-1. run `go install git.um-react.app/um/cli/cmd/um@main`
+```bash
+go install git.um-react.app/um/cli/cmd/um@main
+```
 
 ### Build from repo source
 
-1. Pull repo source.
-2. Build with `go build ./cmd/um`.
+```bash
+git clone https://git.um-react.app/um/cli.git
+cd cli
+go build -o um ./cmd/um
+```
 
-It will produce `um` or `um.exe` (Windows).
+Produces `um` (or `um.exe` on Windows).
 
 ## How to use
 
-- 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
+```bash
+# Single file or directory (default input = cwd, default output = input dir)
+./um [-o <output dir>] [-i] <input dir/file>
+
+# Common flags
+./um -o ./out --overwrite ./encrypted/
+./um --watch -o ./out ./inbox/                 # process existing + watch for new files
+./um --update-metadata -o ./out song.mflac     # needs ffmpeg/ffprobe
+./um --supported-ext                           # list registered extensions
+./um -h
+```
+
+Drag-and-drop onto `um.exe` also works on Windows (passes the path as argv).
+
+## Development
+
+See [AGENTS.md](./AGENTS.md) for repository layout, how to add a decoder, and agent-oriented conventions.
+
+## License
+
+This project is licensed under the MIT License.  
+See the [LICENSE](./LICENSE) file for details.

algo/qmc/key_android_db_loader.go

@@ -0,0 +1,110 @@
+package qmc
+
+import (
+	"database/sql"
+	"fmt"
+	"path/filepath"
+
+	"git.um-react.app/um/cli/algo/common"
+	"git.um-react.app/um/cli/internal/utils"
+	"go.uber.org/zap"
+	_ "modernc.org/sqlite"
+)
+
+// LoadAndroidDB loads QMC ekeys from a QQ Music Android SQLite DB
+// (player_process_db). Soft-fails with a warning.
+func LoadAndroidDB(path string, logger *zap.Logger) common.QMCKeys {
+	if path == "" {
+		return nil
+	}
+	logger.Debug("LoadAndroidDB: Loading Android DB", zap.String("path", path))
+
+	keys, err := loadAndroidDB(path)
+	if err != nil {
+		logger.Warn("LoadAndroidDB: could not read Android DB keys", zap.Error(err))
+		return nil
+	}
+	logger.Info("Using Android DB", zap.String("path", path), zap.Int("count", len(keys)))
+	return keys
+}
+
+func loadAndroidDB(path string) (common.QMCKeys, error) {
+	// mode=ro: refuse writes and do not create a missing database file.
+	dsn := "file:" + filepath.ToSlash(path) + "?mode=ro"
+	db, err := sql.Open("sqlite", dsn)
+	if err != nil {
+		return nil, fmt.Errorf("open: %w", err)
+	}
+	defer db.Close()
+
+	if err := db.Ping(); err != nil {
+		return nil, fmt.Errorf("ping: %w", err)
+	}
+
+	query, err := androidEKeyQuery(db)
+	if err != nil {
+		return nil, err
+	}
+
+	rows, err := db.Query(query)
+	if err != nil {
+		return nil, fmt.Errorf("query: %w", err)
+	}
+	defer rows.Close()
+
+	result := make(common.QMCKeys)
+	for rows.Next() {
+		var filePath, ekey string
+		if err := rows.Scan(&filePath, &ekey); err != nil {
+			return nil, fmt.Errorf("scan: %w", err)
+		}
+		filePath = utils.NormalizeUnicode(filePath)
+		ekey = utils.NormalizeUnicode(ekey)
+		if filePath == "" || ekey == "" {
+			continue
+		}
+		result[filePath] = ekey
+		if base := filepath.Base(filePath); base != filePath {
+			result[utils.NormalizeUnicode(base)] = ekey
+		}
+	}
+	if err := rows.Err(); err != nil {
+		return nil, fmt.Errorf("rows: %w", err)
+	}
+	return result, nil
+}
+
+func androidEKeyQuery(db *sql.DB) (string, error) {
+	has, err := hasTable(db, "audio_file_ekey_table")
+	if err != nil {
+		return "", err
+	}
+	if has {
+		return "select file_path, ekey from audio_file_ekey_table", nil
+	}
+
+	has, err = hasTable(db, "EKeyFileInfo")
+	if err != nil {
+		return "", err
+	}
+	if has {
+		return "select filePath, eKey from EKeyFileInfo", nil
+	}
+
+	return "", fmt.Errorf("no known ekey table found (audio_file_ekey_table or EKeyFileInfo)")
+}
+
+func hasTable(db *sql.DB, name string) (bool, error) {
+	var found string
+	err := db.QueryRow(
+		`select name from sqlite_master where type='table' and name=?`,
+		name,
+	).Scan(&found)
+	if err == sql.ErrNoRows {
+		return false, nil
+	}
+	if err != nil {
+		return false, fmt.Errorf("hasTable(%s): %w", name, err)
+	}
+	return true, nil
+}

algo/qmc/key_android_db_loader_test.go

@@ -0,0 +1,135 @@
+package qmc
+
+import (
+	"database/sql"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"go.uber.org/zap"
+)
+
+func TestLoadAndroidDB_audioFileEkeyTable(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "db")
+	db, err := sql.Open("sqlite", path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = db.Exec(`
+		create table audio_file_ekey_table (file_path text, ekey text);
+		insert into audio_file_ekey_table values
+			('/storage/emulated/0/Music/song.mflac', 'ekey1'),
+			('plain.mgg', 'ekey2'),
+			('', 'skip'),
+			('empty-ekey.mflac', '');
+	`)
+	if err != nil {
+		t.Fatal(err)
+	}
+	db.Close()
+
+	got := LoadAndroidDB(path, zap.NewNop())
+	if got["/storage/emulated/0/Music/song.mflac"] != "ekey1" {
+		t.Errorf("full path = %q", got["/storage/emulated/0/Music/song.mflac"])
+	}
+	if got["song.mflac"] != "ekey1" {
+		t.Errorf("basename = %q, want ekey1", got["song.mflac"])
+	}
+	if got["plain.mgg"] != "ekey2" {
+		t.Errorf("plain.mgg = %q", got["plain.mgg"])
+	}
+	if _, ok := got[""]; ok {
+		t.Error("empty path should not be stored")
+	}
+	if _, ok := got["empty-ekey.mflac"]; ok {
+		t.Error("empty ekey should not be stored")
+	}
+}
+
+func TestLoadAndroidDB_EKeyFileInfo(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "db")
+	db, err := sql.Open("sqlite", path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = db.Exec(`
+		create table EKeyFileInfo (filePath text, eKey text);
+		insert into EKeyFileInfo values
+			('/data/data/com.tencent.qqmusic/files/a.mflac', 'KEYA');
+	`)
+	if err != nil {
+		t.Fatal(err)
+	}
+	db.Close()
+
+	got := LoadAndroidDB(path, zap.NewNop())
+	if got["/data/data/com.tencent.qqmusic/files/a.mflac"] != "KEYA" {
+		t.Errorf("full path = %q", got["/data/data/com.tencent.qqmusic/files/a.mflac"])
+	}
+	if got["a.mflac"] != "KEYA" {
+		t.Errorf("basename = %q, want KEYA", got["a.mflac"])
+	}
+}
+
+func TestLoadAndroidDB_emptyPath(t *testing.T) {
+	got := LoadAndroidDB("", zap.NewNop())
+	if got != nil {
+		t.Errorf("got %#v, want nil", got)
+	}
+}
+
+func TestLoadAndroidDB_missingFile(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "no-such-db")
+	got := LoadAndroidDB(path, zap.NewNop())
+	if got != nil {
+		t.Errorf("got %#v, want nil", got)
+	}
+	if _, err := os.Stat(path); err == nil {
+		t.Error("missing db path should not be created")
+	} else if !os.IsNotExist(err) {
+		t.Fatalf("stat: %v", err)
+	}
+}
+
+func TestLoadAndroidDB_noKnownTable(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "db")
+	db, err := sql.Open("sqlite", path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := db.Exec(`create table other (x text)`); err != nil {
+		t.Fatal(err)
+	}
+	db.Close()
+
+	got := LoadAndroidDB(path, zap.NewNop())
+	if got != nil {
+		t.Errorf("got %#v, want nil", got)
+	}
+}
+
+func TestLoadAndroidDB_prefersAudioFileEkeyTable(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "db")
+	db, err := sql.Open("sqlite", path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = db.Exec(`
+		create table audio_file_ekey_table (file_path text, ekey text);
+		create table EKeyFileInfo (filePath text, eKey text);
+		insert into audio_file_ekey_table values ('from-new.mflac', 'new');
+		insert into EKeyFileInfo values ('from-old.mflac', 'old');
+	`)
+	if err != nil {
+		t.Fatal(err)
+	}
+	db.Close()
+
+	got := LoadAndroidDB(path, zap.NewNop())
+	if got["from-new.mflac"] != "new" {
+		t.Errorf("got %#v, want new table", got)
+	}
+	if _, ok := got["from-old.mflac"]; ok {
+		t.Error("should prefer audio_file_ekey_table over EKeyFileInfo")
+	}
+}

algo/qmc/key_mmkv_loader.go

@@ -0,0 +1,64 @@
+package qmc
+
+import (
+	"bufio"
+	"io"
+	"strings"
+
+	"git.um-react.app/um/cli/algo/common"
+	"git.um-react.app/um/cli/internal/mmkv"
+	"git.um-react.app/um/cli/internal/utils"
+	"go.uber.org/zap"
+)
+
+// MMKVLoaderOptions holds platform-specific inputs for LoadMMKVOrDefault.
+type MMKVLoaderOptions struct {
+	CliExe string // qmpc-mmkv-cli path (--qmpc-mmkv-cli-exe); Windows only
+}
+
+// LoadUserMMKV loads keys from a user-specified mmkv path. Soft-fails with a warning.
+func LoadUserMMKV(path string, key string, logger *zap.Logger) common.QMCKeys {
+	if path == "" {
+		return nil
+	}
+	logger.Debug("LoadUserMMKV: Loading user mmkv", zap.String("path", path), zap.String("key", key))
+	userKeys, err := mmkv.LoadFromPath(path, key, logger)
+	if err != nil {
+		logger.Warn("LoadUserMMKV: could not read user keys", zap.Error(err))
+		return nil
+	}
+	logger.Info("Using user mmkv", zap.String("path", path), zap.Int("count", len(userKeys)))
+	return userKeys
+}
+
+// parseQmpcMMKVCliOutput reads qmpc-mmkv-cli plaintext output as alternating
+// filename / ekey lines and builds a QMCKeys map.
+func parseQmpcMMKVCliOutput(r io.Reader, logger *zap.Logger) common.QMCKeys {
+	sc := bufio.NewScanner(r)
+	result := make(common.QMCKeys)
+
+	var name string
+	nameRead := false
+	for sc.Scan() {
+		line := utils.NormalizeUnicode(strings.TrimSpace(sc.Text()))
+		if !nameRead {
+			name = line
+		} else {
+			if name != "" && line != "" {
+				result[name] = line
+			}
+		}
+		nameRead = !nameRead
+	}
+
+	if err := sc.Err(); err != nil {
+		logger.Warn("LoadMMKVOrDefault: error reading qmpc-mmkv-cli output", zap.Error(err))
+	}
+	if nameRead {
+		logger.Warn("LoadMMKVOrDefault: qmpc-mmkv-cli output has odd number of lines, ignoring last line",
+			zap.String("line", name),
+		)
+	}
+
+	return result
+}

algo/qmc/key_mmkv_loader_darwin.go

@@ -7,7 +7,7 @@ import (
 	"go.uber.org/zap"
 )
 
-func LoadMMKVOrDefault(path string, key string, logger *zap.Logger) (result common.QMCKeys, err error) {
+func LoadMMKVOrDefault(opts MMKVLoaderOptions, logger *zap.Logger) (result common.QMCKeys, err error) {
 	key1, err := qmmac.LoadMacKeysV8(logger)
 	if err != nil {
 		key1 = nil
@@ -20,19 +20,7 @@ func LoadMMKVOrDefault(path string, key string, logger *zap.Logger) (result comm
 		logger.Warn("LoadMMKVOrDefault: could not read QQMusic v10.x keys", zap.Error(err))
 	}
 
-	userKeys := make(common.QMCKeys)
-	if path != "" {
-		logger.Info("Using user mmkv")
-		userKeys, err = mmkv.LoadFromPath(path, key, logger)
-		if err != nil {
-			userKeys = nil
-			logger.Warn("LoadMMKVOrDefault: could not read user keys", zap.Error(err))
-		}
-	}
-
-	allKeys := mmkv.Merge(key1, key2, userKeys)
-
+	allKeys := mmkv.Merge(key1, key2)
 	logger.Debug("Keys loaded", zap.Any("keys", allKeys), zap.Int("len", len(allKeys)))
-
 	return allKeys, nil
 }

algo/qmc/key_mmkv_loader_default.go

@@ -1,4 +1,4 @@
-//go:build !darwin
+//go:build !darwin && !windows
 
 package qmc
 
@@ -7,7 +7,7 @@ import (
 	"go.uber.org/zap"
 )
 
-func LoadMMKVOrDefault(path string, key string, logger *zap.Logger) (result common.QMCKeys, err error) {
-	// Stub: do nothing
+func LoadMMKVOrDefault(opts MMKVLoaderOptions, logger *zap.Logger) (result common.QMCKeys, err error) {
+	// No platform-default QMC keys on this OS.
 	return nil, nil
 }

algo/qmc/key_mmkv_loader_test.go

@@ -0,0 +1,79 @@
+package qmc
+
+import (
+	"strings"
+	"testing"
+
+	"go.uber.org/zap"
+)
+
+func TestParseQmpcMMKVCliOutput(t *testing.T) {
+	logger := zap.NewNop()
+
+	t.Run("pairs", func(t *testing.T) {
+		in := "file1.mflac\nkey1\nfile2.mgg\nkey2\n"
+		got := parseQmpcMMKVCliOutput(strings.NewReader(in), logger)
+		if len(got) != 2 {
+			t.Fatalf("len = %d, want 2", len(got))
+		}
+		if got["file1.mflac"] != "key1" {
+			t.Errorf("file1.mflac = %q, want key1", got["file1.mflac"])
+		}
+		if got["file2.mgg"] != "key2" {
+			t.Errorf("file2.mgg = %q, want key2", got["file2.mgg"])
+		}
+	})
+
+	t.Run("crlf", func(t *testing.T) {
+		in := "a.mflac\r\nKEYA\r\nb.mflac\r\nKEYB\r\n"
+		got := parseQmpcMMKVCliOutput(strings.NewReader(in), logger)
+		if got["a.mflac"] != "KEYA" || got["b.mflac"] != "KEYB" {
+			t.Errorf("got %#v", got)
+		}
+	})
+
+	t.Run("odd line ignored", func(t *testing.T) {
+		in := "file1.mflac\nkey1\norphan\n"
+		got := parseQmpcMMKVCliOutput(strings.NewReader(in), logger)
+		if len(got) != 1 || got["file1.mflac"] != "key1" {
+			t.Errorf("got %#v, want single pair", got)
+		}
+	})
+
+	t.Run("empty name skipped", func(t *testing.T) {
+		in := "\nkey-for-empty\nfile.mflac\nrealkey\n"
+		got := parseQmpcMMKVCliOutput(strings.NewReader(in), logger)
+		if len(got) != 1 || got["file.mflac"] != "realkey" {
+			t.Errorf("got %#v", got)
+		}
+		if _, ok := got[""]; ok {
+			t.Error("empty name should not be stored")
+		}
+	})
+
+	t.Run("empty key skipped", func(t *testing.T) {
+		in := "empty-key.mflac\n\nfile.mflac\nrealkey\n"
+		got := parseQmpcMMKVCliOutput(strings.NewReader(in), logger)
+		if len(got) != 1 || got["file.mflac"] != "realkey" {
+			t.Errorf("got %#v", got)
+		}
+		if _, ok := got["empty-key.mflac"]; ok {
+			t.Error("empty key should not be stored")
+		}
+	})
+
+	t.Run("empty input", func(t *testing.T) {
+		got := parseQmpcMMKVCliOutput(strings.NewReader(""), logger)
+		if len(got) != 0 {
+			t.Errorf("got %#v, want empty", got)
+		}
+	})
+
+	t.Run("no trailing newline", func(t *testing.T) {
+		in := "file.mflac\nkey"
+		got := parseQmpcMMKVCliOutput(strings.NewReader(in), logger)
+		if got["file.mflac"] != "key" {
+			t.Errorf("got %#v", got)
+		}
+	})
+}

algo/qmc/key_mmkv_loader_windows.go

@@ -0,0 +1,45 @@
+package qmc
+
+import (
+	"bytes"
+	"errors"
+	"os/exec"
+
+	"git.um-react.app/um/cli/algo/common"
+	"go.uber.org/zap"
+)
+
+func LoadMMKVOrDefault(opts MMKVLoaderOptions, logger *zap.Logger) (result common.QMCKeys, err error) {
+	cliExe := opts.CliExe
+	if cliExe == "" {
+		cliExe = "qmpc-mmkv-cli.exe"
+	}
+
+	cmd := exec.Command(cliExe, "-f", "plaintext", "-o", "-")
+	var stdout, stderr bytes.Buffer
+	cmd.Stdout = &stdout
+	cmd.Stderr = &stderr
+
+	err = cmd.Run()
+	if err != nil {
+		var exitErr *exec.ExitError
+		if errors.As(err, &exitErr) {
+			logger.Warn("LoadMMKVOrDefault: qmpc-mmkv-cli exited with non-zero status",
+				zap.String("exe", cliExe),
+				zap.Int("exit_code", exitErr.ExitCode()),
+				zap.String("stderr", stderr.String()),
+			)
+		} else {
+			logger.Warn("LoadMMKVOrDefault: failed to run qmpc-mmkv-cli",
+				zap.String("exe", cliExe),
+				zap.Error(err),
+				zap.String("stderr", stderr.String()),
+			)
+		}
+		return nil, nil
+	}
+
+	result = parseQmpcMMKVCliOutput(&stdout, logger)
+	logger.Debug("Keys loaded from qmpc-mmkv-cli", zap.Int("len", len(result)))
+	return result, nil
+}

algo/qmc/qmc.go

@@ -276,8 +276,8 @@ func init() {
 
 	// New ogg/flac:
 	extraExtsCanHaveSuffix := []string{"mgg", "mflac"}
-	// Mac also adds some extra suffix to ext:
-	extraExtSuffix := []string{"0", "1", "a", "h", "l", "m"}
+	// Mac/Android also adds some extra suffix to ext:
+	extraExtSuffix := []string{"0", "1", "2", "a", "h", "l", "m"}
 	for _, ext := range extraExtsCanHaveSuffix {
 		common.RegisterDecoder(ext, false, NewDecoder)
 		for _, suffix := range extraExtSuffix {

algo/qmc/qmc_meta.go

@@ -61,7 +61,7 @@ func (d *Decoder) getMetaBySongID(ctx context.Context) error {
 
 func (d *Decoder) searchMetaOnline(ctx context.Context, original common.AudioMeta) error {
 	c := client.NewQQMusicClient() // todo: use global client
-	keyword := lo.WithoutEmpty(append(
+	keyword := lo.Compact(append(
 		[]string{original.GetTitle(), original.GetAlbum()},
 		original.GetArtists()...),
 	)

cmd/um/main.go

@@ -24,6 +24,7 @@ import (
 	_ "git.um-react.app/um/cli/algo/xiami"
 	_ "git.um-react.app/um/cli/algo/ximalaya"
 	"git.um-react.app/um/cli/internal/ffmpeg"
+	"git.um-react.app/um/cli/internal/mmkv"
 	"git.um-react.app/um/cli/internal/sniff"
 	"git.um-react.app/um/cli/internal/utils"
 	"github.com/fsnotify/fsnotify"
@@ -51,6 +52,8 @@ func main() {
 			&cli.StringFlag{Name: "output", Aliases: []string{"o"}, Usage: "path to output dir", Required: false},
 			&cli.StringFlag{Name: "qmc-mmkv", Aliases: []string{"db"}, Usage: "path to QQMusic mmkv path", Required: false},
 			&cli.StringFlag{Name: "qmc-mmkv-key", Aliases: []string{"key"}, Usage: "QQMusic mmkv password (16 ascii chars)", Required: false},
+			&cli.StringFlag{Name: "qmpc-mmkv-cli-exe", Usage: "path to QMPC MMKV Cli by LSR (v0.1.1+, auto-fetch QMC keys; Windows only)", Required: false, Value: "qmpc-mmkv-cli.exe"},
+			&cli.StringFlag{Name: "qmc-android-db", Usage: "path to QQMusic Android player_process_db (dump from android: /data/data/com.tencent.qqmusic/databases/)", Required: false, Value: ""},
 			&cli.StringFlag{Name: "kgg-db", Usage: "path to kgg db (win32 kugou v11)", 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},
@@ -176,11 +179,26 @@ func appMain(c *cli.Context) (err error) {
 		return errors.New("output should be a writable directory")
 	}
 
-	// QMC: Load keys
-	qmcKeys, err := qmc.LoadMMKVOrDefault(c.String("qmc-mmkv"), c.String("qmc-mmkv-key"), logger)
+	// QMC: Load platform keys, then merge user mmkv (--qmc-mmkv) on all platforms.
+	qmcKeys, err := qmc.LoadMMKVOrDefault(qmc.MMKVLoaderOptions{
+		CliExe: c.String("qmpc-mmkv-cli-exe"),
+	}, logger)
 	if err != nil {
 		return err
 	}
+	qmcAndroidKeysPath := c.String("qmc-android-db")
+	if qmcAndroidKeysPath == "" {
+		// By default, use the current directory's `player_process_db` file if exists.
+		// Do not complain if this file does not exist.
+		if db, err := os.Stat("player_process_db"); err == nil && !db.IsDir() {
+			qmcAndroidKeysPath = "player_process_db"
+		}
+	}
+	qmcKeys = mmkv.Merge(
+		qmcKeys,
+		qmc.LoadUserMMKV(c.String("qmc-mmkv"), c.String("qmc-mmkv-key"), logger),
+		qmc.LoadAndroidDB(qmcAndroidKeysPath, logger),
+	)
 
 	kggDbPath := c.String("kgg-db")
 	if kggDbPath == "" {

go.mod

@@ -3,32 +3,32 @@ module git.um-react.app/um/cli
 go 1.25.1
 
 require (
-	github.com/fsnotify/fsnotify v1.8.0
+	github.com/fsnotify/fsnotify v1.9.0
 	github.com/go-flac/flacpicture v0.3.0
 	github.com/go-flac/flacvorbis v0.2.0
 	github.com/go-flac/go-flac v1.0.0
-	github.com/samber/lo v1.47.0
-	github.com/unlock-music/go-mmkv v0.1.2
-	github.com/urfave/cli/v2 v2.27.5
+	github.com/samber/lo v1.52.0
+	github.com/unlock-music/go-mmkv v0.1.4
+	github.com/urfave/cli/v2 v2.27.7
 	go.uber.org/zap v1.27.0
-	golang.org/x/crypto v0.29.0
-	golang.org/x/exp v0.0.0-20250305212735-054e65f0b394
-	golang.org/x/text v0.20.0
-	modernc.org/sqlite v1.37.0
+	golang.org/x/crypto v0.44.0
+	golang.org/x/text v0.31.0
+	modernc.org/sqlite v1.40.0
 )
 
 require (
-	github.com/cpuguy83/go-md2man/v2 v2.0.5 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.7 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
-	github.com/ncruces/go-strftime v0.1.9 // indirect
+	github.com/ncruces/go-strftime v1.0.0 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
-	github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1 // indirect
+	github.com/xrash/smetrics v0.0.0-20250705151800-55b8f293f342 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
-	golang.org/x/sys v0.31.0 // indirect
-	modernc.org/libc v1.62.1 // indirect
+	golang.org/x/exp v0.0.0-20250620022241-b7579e27df2b // indirect
+	golang.org/x/sys v0.38.0 // indirect
+	modernc.org/libc v1.66.10 // indirect
 	modernc.org/mathutil v1.7.1 // indirect
-	modernc.org/memory v1.9.1 // indirect
+	modernc.org/memory v1.11.0 // indirect
 )

go.sum

@@ -1,86 +1,96 @@
-github.com/cpuguy83/go-md2man/v2 v2.0.5 h1:ZtcqGrnekaHpVLArFSe4HK5DoKx1T0rq2DwVB0alcyc=
-github.com/cpuguy83/go-md2man/v2 v2.0.5/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/BurntSushi/toml v1.5.0 h1:W5quZX/G/csjUnuI8SUYlsHs9M38FC7znL0lIO+DvMg=
+github.com/BurntSushi/toml v1.5.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
+github.com/cpuguy83/go-md2man/v2 v2.0.7 h1:zbFlGlXEAKlwXpmvle3d8Oe3YnkKIK4xSRTd3sHPnBo=
+github.com/cpuguy83/go-md2man/v2 v2.0.7/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
-github.com/fsnotify/fsnotify v1.8.0 h1:dAwr6QBTBZIkG8roQaJjGof0pp0EeF+tNV7YBP3F/8M=
-github.com/fsnotify/fsnotify v1.8.0/go.mod h1:8jBTzvmWwFyi3Pb8djgCCO5IBqzKJ/Jwo8TRcHyHii0=
+github.com/fsnotify/fsnotify v1.9.0 h1:2Ml+OJNzbYCTzsxtv8vKSFD9PbJjmhYF14k/jKC7S9k=
+github.com/fsnotify/fsnotify v1.9.0/go.mod h1:8jBTzvmWwFyi3Pb8djgCCO5IBqzKJ/Jwo8TRcHyHii0=
 github.com/go-flac/flacpicture v0.3.0 h1:LkmTxzFLIynwfhHiZsX0s8xcr3/u33MzvV89u+zOT8I=
 github.com/go-flac/flacpicture v0.3.0/go.mod h1:DPbrzVYQ3fJcvSgLFp9HXIrEQEdfdk/+m0nQCzwodZI=
 github.com/go-flac/flacvorbis v0.2.0 h1:KH0xjpkNTXFER4cszH4zeJxYcrHbUobz/RticWGOESs=
 github.com/go-flac/flacvorbis v0.2.0/go.mod h1:uIysHOtuU7OLGoCRG92bvnkg7QEqHx19qKRV6K1pBrI=
 github.com/go-flac/go-flac v1.0.0 h1:6qI9XOVLcO50xpzm3nXvO31BgDgHhnr/p/rER/K/doY=
 github.com/go-flac/go-flac v1.0.0/go.mod h1:WnZhcpmq4u1UdZMNn9LYSoASpWOCMOoxXxcWEHSzkW8=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e h1:ijClszYn+mADRFY17kjQEVQ1XRhq2/JR1M3sGqeJoxs=
 github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e/go.mod h1:boTsfXsheKC2y+lKOCMpSfarhxDeIzfZG1jqGcPl3cA=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
-github.com/ncruces/go-strftime v0.1.9 h1:bY0MQC28UADQmHmaF5dgpLmImcShSi2kHU9XLdhx/f4=
-github.com/ncruces/go-strftime v0.1.9/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
+github.com/ncruces/go-strftime v1.0.0 h1:HMFp8mLCTPp341M/ZnA4qaf7ZlsbTc+miZjCLOFAw7w=
+github.com/ncruces/go-strftime v1.0.0/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
 github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
-github.com/samber/lo v1.47.0 h1:z7RynLwP5nbyRscyvcD043DWYoOcYRv3mV8lBeqOCLc=
-github.com/samber/lo v1.47.0/go.mod h1:RmDH9Ct32Qy3gduHQuKJ3gW1fMHAnE/fAzQuf6He5cU=
+github.com/samber/lo v1.52.0 h1:Rvi+3BFHES3A8meP33VPAxiBZX/Aws5RxrschYGjomw=
+github.com/samber/lo v1.52.0/go.mod h1:4+MXEGsJzbKGaUEQFKBq2xtfuznW9oz/WrgyzMzRoM0=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
-github.com/unlock-music/go-mmkv v0.1.1 h1:1w3shjaBMp58jRrRkxPghnMpvyUoP4ZkA++W9ueFpE8=
-github.com/unlock-music/go-mmkv v0.1.1/go.mod h1:E1h/HBpWPOKnCQw6LSQZkMpzxQojGDe+T5f/DRDXBsc=
-github.com/unlock-music/go-mmkv v0.1.2 h1:nZvYoyO/LO4ycXHYmObgHVNXxqMjfINeCYwKFmiyOQc=
-github.com/unlock-music/go-mmkv v0.1.2/go.mod h1:E1h/HBpWPOKnCQw6LSQZkMpzxQojGDe+T5f/DRDXBsc=
-github.com/urfave/cli/v2 v2.27.5 h1:WoHEJLdsXr6dDWoJgMq/CboDmyY/8HMMH1fTECbih+w=
-github.com/urfave/cli/v2 v2.27.5/go.mod h1:3Sevf16NykTbInEnD0yKkjDAeZDS0A6bzhBH5hrMvTQ=
-github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1 h1:gEOO8jv9F4OT7lGCjxCBTO/36wtF6j2nSip77qHd4x4=
-github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1/go.mod h1:Ohn+xnUBiLI6FVj/9LpzZWtj1/D6lUovWYBkxHVV3aM=
+github.com/unlock-music/go-mmkv v0.1.4 h1:onjxxlNd9Fcp4RYL8khOgp/DRY0n+Iuw958TdRoB/FA=
+github.com/unlock-music/go-mmkv v0.1.4/go.mod h1:u1fYHzYOO7et1E55Q86lTvjXf6p14CIELszAHI8T9zQ=
+github.com/urfave/cli/v2 v2.27.7 h1:bH59vdhbjLv3LAvIu6gd0usJHgoTTPhCFib8qqOwXYU=
+github.com/urfave/cli/v2 v2.27.7/go.mod h1:CyNAG/xg+iAOg0N4MPGZqVmv2rCoP267496AOXUZjA4=
+github.com/xrash/smetrics v0.0.0-20250705151800-55b8f293f342 h1:FnBeRrxr7OU4VvAzt5X7s6266i6cSVkkFPS0TuXWbIg=
+github.com/xrash/smetrics v0.0.0-20250705151800-55b8f293f342/go.mod h1:Ohn+xnUBiLI6FVj/9LpzZWtj1/D6lUovWYBkxHVV3aM=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
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internal/ffmpeg/meta_flac.go

@@ -2,14 +2,15 @@ package ffmpeg
 
 import (
 	"context"
-	"go.uber.org/zap"
 	"mime"
+	"slices"
 	"strings"
 
+	"go.uber.org/zap"
+
 	"github.com/go-flac/flacpicture"
 	"github.com/go-flac/flacvorbis"
 	"github.com/go-flac/go-flac"
-	"golang.org/x/exp/slices"
 )
 
 func updateMetaFlac(_ context.Context, outPath string, m *UpdateMetadataParams, logger *zap.Logger) error {

internal/sniff/audio.go

@@ -3,8 +3,7 @@ package sniff
 import (
 	"bytes"
 	"encoding/binary"
-
-	"golang.org/x/exp/slices"
+	"slices"
 )
 
 type Sniffer interface {