diff --git a/coolq/bot.go b/coolq/bot.go
index 228faf3..5ff9b36 100644
--- a/coolq/bot.go
+++ b/coolq/bot.go
@@ -14,8 +14,6 @@ import (
 	"sync"
 	"time"
 
-	"github.com/gabriel-vasile/mimetype"
-
 	"github.com/Mrs4s/MiraiGo/binary"
 	"github.com/Mrs4s/MiraiGo/client"
 	"github.com/Mrs4s/MiraiGo/message"
@@ -70,29 +68,6 @@ func (e *Event) JSONString() string {
 	return utils.B2S(e.buffer.Bytes())
 }
 
-// keep sync with /docs/file.md#MINE
-var lawfulImageTypes = [...]string{
-	"image/bmp",
-	"image/gif",
-	"image/jpeg",
-	"image/png",
-	"image/webp",
-}
-
-var lawfulAudioTypes = [...]string{
-	"audio/aac",
-	"audio/aiff",
-	"audio/amr",
-	"audio/ape",
-	"audio/flac",
-	"audio/midi",
-	"audio/mp4",
-	"audio/mpeg",
-	"audio/ogg",
-	"audio/wav",
-	"audio/x-m4a",
-}
-
 // NewQQBot 初始化一个QQBot实例
 func NewQQBot(cli *client.QQClient, conf *config.Config) *CQBot {
 	bot := &CQBot{
@@ -203,7 +178,7 @@ func (bot *CQBot) UploadLocalImageAsGroup(groupCode int64, img *LocalImageElemen
 		defer func() { _ = f.Close() }()
 		img.Stream = f
 	}
-	if lawful, mime := IsLawfulImage(img.Stream); !lawful {
+	if lawful, mime := base.IsLawfulImage(img.Stream); !lawful {
 		return nil, errors.New("image type error: " + mime)
 	}
 	i, err = bot.Client.UploadGroupImage(groupCode, img.Stream)
@@ -238,7 +213,7 @@ func (bot *CQBot) UploadLocalImageAsPrivate(userID int64, img *LocalImageElement
 		defer func() { _ = f.Close() }()
 		img.Stream = f
 	}
-	if lawful, mime := IsLawfulImage(img.Stream); !lawful {
+	if lawful, mime := base.IsLawfulImage(img.Stream); !lawful {
 		return nil, errors.New("image type error: " + mime)
 	}
 	i, err = bot.Client.UploadPrivateImage(userID, img.Stream)
@@ -609,25 +584,3 @@ func (bot *CQBot) uploadMedia(raw message.IMessageElement, target int64, group b
 	}
 	return nil, errors.New("unsupported message element type")
 }
-
-// IsLawfulImage 判断给定流是否为合法图片
-// 返回 是否合法, 实际Mime
-// 判断后会自动将 Stream Seek 至 0
-func IsLawfulImage(r io.ReadSeeker) (bool, string) {
-	if base.SkipMimeScan {
-		return true, ""
-	}
-	_, _ = r.Seek(0, io.SeekStart)
-	defer func() { _, _ = r.Seek(0, io.SeekStart) }()
-	t, err := mimetype.DetectReader(r)
-	if err != nil {
-		log.Debugf("扫描 Mime 时出现问题: %v", err)
-		return false, ""
-	}
-	for _, lt := range lawfulImageTypes {
-		if t.Is(lt) {
-			return true, t.String()
-		}
-	}
-	return false, t.String()
-}
diff --git a/coolq/cqcode.go b/coolq/cqcode.go
index 55296a7..e0a6975 100644
--- a/coolq/cqcode.go
+++ b/coolq/cqcode.go
@@ -20,12 +20,10 @@ import (
 	"github.com/Mrs4s/MiraiGo/binary"
 	"github.com/Mrs4s/MiraiGo/message"
 	"github.com/Mrs4s/MiraiGo/utils"
-	"github.com/gabriel-vasile/mimetype"
 	log "github.com/sirupsen/logrus"
 	"github.com/tidwall/gjson"
 
 	"github.com/Mrs4s/go-cqhttp/global"
-	"github.com/Mrs4s/go-cqhttp/global/codec"
 	"github.com/Mrs4s/go-cqhttp/internal/base"
 	"github.com/Mrs4s/go-cqhttp/internal/param"
 )
@@ -715,7 +713,7 @@ func (bot *CQBot) ToElement(t string, d map[string]string, isGroup bool) (m inte
 		if err != nil {
 			return nil, err
 		}
-		return &message.VoiceElement{Data: codec.RecodeTo24K(data)}, nil
+		return &message.VoiceElement{Data: base.ResampleSilk(data)}, nil
 	case "record":
 		f := d["file"]
 		data, err := global.FindFile(f, d["cache"], global.VoicePath)
@@ -725,17 +723,10 @@ func (bot *CQBot) ToElement(t string, d map[string]string, isGroup bool) (m inte
 		if err != nil {
 			return nil, err
 		}
-		if !base.SkipMimeScan && !global.IsAMRorSILK(data) {
-			mt := mimetype.Detect(data)
-			lawful := false
-			for _, lt := range lawfulAudioTypes {
-				if mt.Is(lt) {
-					lawful = true
-					break
-				}
-			}
+		if !global.IsAMRorSILK(data) {
+			lawful, mt := base.IsLawfulAudio(bytes.NewReader(data))
 			if !lawful {
-				return nil, errors.New("audio type error: " + mt.String())
+				return nil, errors.New("audio type error: " + mt)
 			}
 		}
 		if !global.IsAMRorSILK(data) {
diff --git a/global/codec.go b/global/codec.go
index 9ff78cb..223c533 100644
--- a/global/codec.go
+++ b/global/codec.go
@@ -7,9 +7,9 @@ import (
 	"os/exec"
 	"path"
 
-	"github.com/Mrs4s/go-cqhttp/global/codec"
-
 	"github.com/pkg/errors"
+
+	"github.com/Mrs4s/go-cqhttp/internal/base"
 )
 
 // EncoderSilk 将音频编码为Silk
@@ -23,7 +23,7 @@ func EncoderSilk(data []byte) ([]byte, error) {
 	if silkPath := path.Join("data/cache", tempName+".silk"); PathExists(silkPath) {
 		return os.ReadFile(silkPath)
 	}
-	slk, err := codec.EncodeToSilk(data, tempName, true)
+	slk, err := base.EncodeSilk(data, tempName)
 	if err != nil {
 		return nil, errors.Wrap(err, "encode silk failed")
 	}
diff --git a/global/codec/doc.go b/global/codec/doc.go
deleted file mode 100644
index ec2c484..0000000
--- a/global/codec/doc.go
+++ /dev/null
@@ -1,2 +0,0 @@
-// Package codec Slik编码核心模块
-package codec
diff --git a/internal/base/feature.go b/internal/base/feature.go
new file mode 100644
index 0000000..f27c0a0
--- /dev/null
+++ b/internal/base/feature.go
@@ -0,0 +1,31 @@
+package base
+
+import (
+	"io"
+
+	"github.com/pkg/errors"
+)
+
+// silk encode features
+var (
+	EncodeSilk   = encodeSilk   // 编码 SilkV3 音频
+	ResampleSilk = resampleSilk // 将silk重新编码为 24000 bit rate
+)
+
+func encodeSilk(_ []byte, _ string) ([]byte, error) {
+	return nil, errors.New("not supported now")
+}
+
+func resampleSilk(data []byte) []byte {
+	return data
+}
+
+// Mime scan feature
+var (
+	IsLawfulImage = nocheck // 检查图片MIME
+	IsLawfulAudio = nocheck // 检查音频MIME
+)
+
+func nocheck(_ io.ReadSeeker) (bool, string) {
+	return true, ""
+}
diff --git a/main.go b/main.go
index 6c939d0..d2205f6 100644
--- a/main.go
+++ b/main.go
@@ -23,6 +23,9 @@ import (
 	"golang.org/x/crypto/pbkdf2"
 	"golang.org/x/term"
 
+	_ "github.com/Mrs4s/go-cqhttp/modules/mime" // mime检查模块
+	_ "github.com/Mrs4s/go-cqhttp/modules/silk" // silk编码模块
+
 	"github.com/Mrs4s/go-cqhttp/coolq"
 	"github.com/Mrs4s/go-cqhttp/global"
 	"github.com/Mrs4s/go-cqhttp/global/config"
diff --git a/modules/mime/mime.go b/modules/mime/mime.go
new file mode 100644
index 0000000..4563099
--- /dev/null
+++ b/modules/mime/mime.go
@@ -0,0 +1,70 @@
+// Package mime 提供MIME检查功能
+package mime
+
+import (
+	"io"
+
+	"github.com/gabriel-vasile/mimetype"
+	"github.com/sirupsen/logrus"
+
+	"github.com/Mrs4s/go-cqhttp/internal/base"
+)
+
+func init() {
+	base.IsLawfulAudio = checkImage
+	base.IsLawfulAudio = checkAudio
+}
+
+// keep sync with /docs/file.md#MINE
+var lawfulImage = [...]string{
+	"image/bmp",
+	"image/gif",
+	"image/jpeg",
+	"image/png",
+	"image/webp",
+}
+
+var lawfulAudio = [...]string{
+	"audio/aac",
+	"audio/aiff",
+	"audio/amr",
+	"audio/ape",
+	"audio/flac",
+	"audio/midi",
+	"audio/mp4",
+	"audio/mpeg",
+	"audio/ogg",
+	"audio/wav",
+	"audio/x-m4a",
+}
+
+func check(r io.ReadSeeker, list []string) (bool, string) {
+	if base.SkipMimeScan {
+		return true, ""
+	}
+	_, _ = r.Seek(0, io.SeekStart)
+	defer r.Seek(0, io.SeekStart) // nolint
+	t, err := mimetype.DetectReader(r)
+	if err != nil {
+		logrus.Debugf("扫描 Mime 时出现问题: %v", err)
+		return false, ""
+	}
+	for _, lt := range list {
+		if t.Is(lt) {
+			return true, t.String()
+		}
+	}
+	return false, t.String()
+}
+
+// checkImage 判断给定流是否为合法图片
+// 返回 是否合法, 实际Mime
+// 判断后会自动将 Stream Seek 至 0
+func checkImage(r io.ReadSeeker) (bool, string) {
+	return check(r, lawfulImage[:])
+}
+
+// checkImage 判断给定流是否为合法音频
+func checkAudio(r io.ReadSeeker) (bool, string) {
+	return check(r, lawfulAudio[:])
+}
diff --git a/global/codec/codec.go b/modules/silk/codec.go
similarity index 80%
rename from global/codec/codec.go
rename to modules/silk/codec.go
index 7563518..19118c6 100644
--- a/global/codec/codec.go
+++ b/modules/silk/codec.go
@@ -4,7 +4,7 @@
 // +build !race
 // +build !nosilk
 
-package codec
+package silk
 
 import (
 	"os"
@@ -19,8 +19,8 @@ import (
 
 const silkCachePath = "data/cache"
 
-// EncodeToSilk 将音频编码为Silk
-func EncodeToSilk(record []byte, tempName string, useCache bool) (silkWav []byte, err error) {
+// encode 将音频编码为Silk
+func encode(record []byte, tempName string) (silkWav []byte, err error) {
 	// 1. 写入缓存文件
 	rawPath := path.Join(silkCachePath, tempName+".wav")
 	err = os.WriteFile(rawPath, record, os.ModePerm)
@@ -50,15 +50,13 @@ func EncodeToSilk(record []byte, tempName string, useCache bool) (silkWav []byte
 	if err != nil {
 		return nil, errors.Wrap(err, "silk encode error")
 	}
-	if useCache {
-		silkPath := path.Join(silkCachePath, tempName+".silk")
-		err = os.WriteFile(silkPath, silkWav, 0o666)
-	}
+	silkPath := path.Join(silkCachePath, tempName+".silk")
+	err = os.WriteFile(silkPath, silkWav, 0o666)
 	return
 }
 
-// RecodeTo24K 将silk重新编码为 24000 bit rate
-func RecodeTo24K(data []byte) []byte {
+// resample 将silk重新编码为 24000 bit rate
+func resample(data []byte) []byte {
 	pcm, err := silk.DecodeSilkBuffToPcm(data, 24000)
 	if err != nil {
 		panic(err)
diff --git a/global/codec/codec_unsupported.go b/modules/silk/codec_unsupported.go
similarity index 58%
rename from global/codec/codec_unsupported.go
rename to modules/silk/codec_unsupported.go
index 336b023..684dcc3 100644
--- a/global/codec/codec_unsupported.go
+++ b/modules/silk/codec_unsupported.go
@@ -1,16 +1,16 @@
 //go:build (!arm && !arm64 && !amd64 && !386) || (!windows && !linux && !darwin) || (windows && arm) || (windows && arm64) || race || nosilk
 // +build !arm,!arm64,!amd64,!386 !windows,!linux,!darwin windows,arm windows,arm64 race nosilk
 
-package codec
+package silk
 
 import "errors"
 
-// EncodeToSilk 将音频编码为Silk
-func EncodeToSilk(record []byte, tempName string, useCache bool) ([]byte, error) {
+// encode 将音频编码为Silk
+func encode(record []byte, tempName string, useCache bool) ([]byte, error) {
 	return nil, errors.New("not supported now")
 }
 
-// RecodeTo24K 将silk重新编码为 24000 bit rate
-func RecodeTo24K(data []byte) []byte {
+// resample 将silk重新编码为 24000 bit rate
+func resample(data []byte) []byte {
 	return data
 }
diff --git a/modules/silk/stubs.go b/modules/silk/stubs.go
new file mode 100644
index 0000000..1b86c70
--- /dev/null
+++ b/modules/silk/stubs.go
@@ -0,0 +1,11 @@
+// Package silk Silk编码核心模块
+package silk
+
+import (
+	"github.com/Mrs4s/go-cqhttp/internal/base"
+)
+
+func init() {
+	base.EncodeSilk = encode
+	base.ResampleSilk = resample
+}