diff --git a/audio/format/aac/libfdk-aac.go b/audio/format/aac/libfdk-aac.go
index 9285999..814ca7f 100644
--- a/audio/format/aac/libfdk-aac.go
+++ b/audio/format/aac/libfdk-aac.go
@@ -7,6 +7,7 @@ import (
 	"errors"
 	"fmt"
 	"git.gammaspectra.live/S.O.N.G/Kirika/audio"
+	"git.gammaspectra.live/S.O.N.G/Kirika/audio/format"
 	"git.gammaspectra.live/S.O.N.G/go-fdkaac/fdkaac"
 	aacAdts "github.com/Eyevinn/mp4ff/aac"
 	"github.com/Eyevinn/mp4ff/mp4"
@@ -503,7 +504,7 @@ func (f Format) Encode(source audio.Source, writer io.WriteCloser, options map[s
 	return nil
 }
 
-func (f Format) Identify(_ []byte, extension string) bool {
+func (f Format) Identify(_ [format.IdentifyPeekBytes]byte, extension string) bool {
 	//TODO: add .m4a/mp4 detection
 	return extension == "aac" || extension == "adts"
 }
diff --git a/audio/format/aac/vo-aacenc.go b/audio/format/aac/vo-aacenc.go
index b95d35c..c01ef4e 100644
--- a/audio/format/aac/vo-aacenc.go
+++ b/audio/format/aac/vo-aacenc.go
@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"git.gammaspectra.live/S.O.N.G/Kirika/audio"
 	"git.gammaspectra.live/S.O.N.G/Kirika/vector"
-	"git.gammaspectra.live/S.O.N.G/voaac-go"
 	"io"
 )
 
@@ -93,6 +92,6 @@ func (f Format) Encode(source audio.Source, writer io.WriteCloser, options map[s
 	return nil
 }
 
-func (f Format) Identify(peek []byte, extension string) bool {
+func (f Format) Identify(peek [format.IdentifyPeekBytes]byte, extension string) bool {
 	return extension == "aac" || extension == "adts"
 }
diff --git a/audio/format/alac/libalac.go b/audio/format/alac/libalac.go
index 5dbb224..2326a2d 100644
--- a/audio/format/alac/libalac.go
+++ b/audio/format/alac/libalac.go
@@ -136,6 +136,6 @@ func (f Format) Encode(source audio.Source, writer io.WriteCloser, options map[s
 	return nil
 }
 
-func (f Format) Identify(_ []byte, extension string) bool {
+func (f Format) Identify(_ [format.IdentifyPeekBytes]byte, extension string) bool {
 	return extension == "alac" || extension == "mp4" || extension == "m4a"
 }
diff --git a/audio/format/flac/goflac.go b/audio/format/flac/goflac.go
index 7a35a8a..5f5fb81 100644
--- a/audio/format/flac/goflac.go
+++ b/audio/format/flac/goflac.go
@@ -224,7 +224,7 @@ func (f Format) Encode(source audio.Source, writer io.WriteCloser, options map[s
 	return nil
 }
 
-func (f Format) Identify(peek []byte, extension string) bool {
+func (f Format) Identify(peek [format.IdentifyPeekBytes]byte, extension string) bool {
 	//No Ogg supported
 	return bytes.Compare(peek[:4], []byte{'f', 'L', 'a', 'C'}) == 0 || (bytes.Compare(peek[:3], []byte{'I', 'D', '3'}) == 0 && extension != "mp3") || extension == "flac"
 }
diff --git a/audio/format/flac/libflac.go b/audio/format/flac/libflac.go
index d03452d..a8ac7b2 100644
--- a/audio/format/flac/libflac.go
+++ b/audio/format/flac/libflac.go
@@ -161,6 +161,6 @@ func (f Format) Encode(source audio.Source, writer io.WriteCloser, options map[s
 	return nil
 }
 
-func (f Format) Identify(peek []byte, extension string) bool {
+func (f Format) Identify(peek [format.IdentifyPeekBytes]byte, extension string) bool {
 	return (bytes.Compare(peek[:4], []byte{'O', 'g', 'g', 'S'}) == 0 && extension != "opus" && extension != "vorbis") || bytes.Compare(peek[:4], []byte{'f', 'L', 'a', 'C'}) == 0 || (bytes.Compare(peek[:3], []byte{'I', 'D', '3'}) == 0 && extension != "mp3") || extension == "flac" || extension == "ogg"
 }
diff --git a/audio/format/format.go b/audio/format/format.go
index 64fe048..5a48fae 100644
--- a/audio/format/format.go
+++ b/audio/format/format.go
@@ -5,9 +5,11 @@ import (
 	"io"
 )
 
+const IdentifyPeekBytes = 16
+
 type Format interface {
 	// Identify checks whether a format is of a type. peek includes a few first bytes, extension is the lowercase file extension without a dot.
-	Identify(peek []byte, extension string) bool
+	Identify(peek [IdentifyPeekBytes]byte, extension string) bool
 	// Name returns the name of the codec or format
 	Name() string
 }
diff --git a/audio/format/guess/guess.go b/audio/format/guess/guess.go
index 2c1f35c..0334d7f 100644
--- a/audio/format/guess/guess.go
+++ b/audio/format/guess/guess.go
@@ -37,7 +37,7 @@ func (f NullFormat) Encode(audio.Source, io.WriteCloser, map[string]interface{})
 	return errors.New("null format")
 }
 
-func (f NullFormat) Identify([]byte, string) bool {
+func (f NullFormat) Identify([format.IdentifyPeekBytes]byte, string) bool {
 	return false
 }
 
@@ -103,8 +103,8 @@ func GetDecoders(r io.ReadSeekCloser, pathName string) (decoders []format.Decode
 	if err != nil {
 		return
 	}
-	peek := make([]byte, 16)
-	if _, err = r.Read(peek); err != nil {
+	var peek [format.IdentifyPeekBytes]byte
+	if _, err = r.Read(peek[:]); err != nil {
 		return
 	}
 	if _, err = r.Seek(startOffset, io.SeekStart); err != nil {
diff --git a/audio/format/mp3/mp3.go b/audio/format/mp3/mp3.go
index b380cca..f1414b8 100644
--- a/audio/format/mp3/mp3.go
+++ b/audio/format/mp3/mp3.go
@@ -5,6 +5,7 @@ package mp3
 import (
 	"bytes"
 	"git.gammaspectra.live/S.O.N.G/Kirika/audio"
+	"git.gammaspectra.live/S.O.N.G/Kirika/audio/format"
 	mp3Lib "git.gammaspectra.live/S.O.N.G/minimp3"
 	"golang.org/x/exp/slices"
 	"io"
@@ -53,7 +54,7 @@ func (f Format) Open(r io.ReadSeekCloser) (audio.Source, error) {
 	return source, nil
 }
 
-func (f Format) Identify(peek []byte, extension string) bool {
+func (f Format) Identify(peek [format.IdentifyPeekBytes]byte, extension string) bool {
 	//match ID3 / sync header
 	return peek[0] == 0xff && (peek[1]>>5) == 0b111 || (bytes.Compare(peek[:3], []byte{'I', 'D', '3'}) == 0 && extension != "flac") || extension == "mp3"
 }
diff --git a/audio/format/mp3/mp3_nocgo.go b/audio/format/mp3/mp3_nocgo.go
index dc41e84..d31c331 100644
--- a/audio/format/mp3/mp3_nocgo.go
+++ b/audio/format/mp3/mp3_nocgo.go
@@ -5,6 +5,7 @@ package mp3
 import (
 	"bytes"
 	"git.gammaspectra.live/S.O.N.G/Kirika/audio"
+	"git.gammaspectra.live/S.O.N.G/Kirika/audio/format"
 	mp3Lib "git.gammaspectra.live/S.O.N.G/go-mp3"
 	"golang.org/x/exp/slices"
 	"io"
@@ -51,7 +52,7 @@ func (f Format) Open(r io.ReadSeekCloser) (audio.Source, error) {
 	return source, nil
 }
 
-func (f Format) Identify(peek []byte, extension string) bool {
+func (f Format) Identify(peek [format.IdentifyPeekBytes]byte, extension string) bool {
 	//match ID3 / sync header
 	return peek[0] == 0xff && (peek[1]>>5) == 0b111 || (bytes.Compare(peek[:3], []byte{'I', 'D', '3'}) == 0 && extension != "flac") || extension == "mp3"
 }
diff --git a/audio/format/opus/opus.go b/audio/format/opus/opus.go
index 5fa80bd..6c78b04 100644
--- a/audio/format/opus/opus.go
+++ b/audio/format/opus/opus.go
@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"git.gammaspectra.live/S.O.N.G/Kirika/audio"
 	"git.gammaspectra.live/S.O.N.G/Kirika/audio/filter"
+	"git.gammaspectra.live/S.O.N.G/Kirika/audio/format"
 	libopus "git.gammaspectra.live/S.O.N.G/go-pus"
 	"io"
 	"time"
@@ -177,6 +178,6 @@ func (f Format) Encode(source audio.Source, writer io.WriteCloser, options map[s
 
 }
 
-func (f Format) Identify(peek []byte, extension string) bool {
+func (f Format) Identify(peek [format.IdentifyPeekBytes]byte, extension string) bool {
 	return bytes.Compare(peek[:4], []byte{'O', 'g', 'g', 'S'}) == 0 || extension == "opus" || extension == "ogg"
 }
diff --git a/audio/format/tta/tta.go b/audio/format/tta/tta.go
index 87e33c2..ca2e45d 100644
--- a/audio/format/tta/tta.go
+++ b/audio/format/tta/tta.go
@@ -180,6 +180,6 @@ func (f Format) Encode(source audio.Source, writer io.WriteCloser, options map[s
 	return nil
 }
 
-func (f Format) Identify(peek []byte, extension string) bool {
+func (f Format) Identify(peek [format.IdentifyPeekBytes]byte, extension string) bool {
 	return bytes.Compare(peek[:4], []byte{'T', 'T', 'A', '1'}) == 0 || extension == "tta"
 }
diff --git a/audio/format/vorbis/vorbis.go b/audio/format/vorbis/vorbis.go
index e7ec795..d6f5944 100644
--- a/audio/format/vorbis/vorbis.go
+++ b/audio/format/vorbis/vorbis.go
@@ -6,6 +6,7 @@ import (
 	"bytes"
 	"fmt"
 	"git.gammaspectra.live/S.O.N.G/Kirika/audio"
+	"git.gammaspectra.live/S.O.N.G/Kirika/audio/format"
 	libvorbis "git.gammaspectra.live/S.O.N.G/go-vorbis"
 	"io"
 )
@@ -111,6 +112,6 @@ func (f Format) Encode(source audio.Source, writer io.WriteCloser, options map[s
 
 }
 
-func (f Format) Identify(peek []byte, extension string) bool {
+func (f Format) Identify(peek [format.IdentifyPeekBytes]byte, extension string) bool {
 	return bytes.Compare(peek[:4], []byte{'O', 'g', 'g', 'S'}) == 0 || extension == "vorbis" || extension == "ogg"
 }
diff --git a/audio/format/vorbis/vorbis_nocgo.go b/audio/format/vorbis/vorbis_nocgo.go
index 8fdcfa0..df66943 100644
--- a/audio/format/vorbis/vorbis_nocgo.go
+++ b/audio/format/vorbis/vorbis_nocgo.go
@@ -5,6 +5,7 @@ package vorbis
 import (
 	"bytes"
 	"git.gammaspectra.live/S.O.N.G/Kirika/audio"
+	"git.gammaspectra.live/S.O.N.G/Kirika/audio/format"
 	libvorbis "github.com/jfreymuth/oggvorbis"
 	"io"
 )
@@ -53,6 +54,6 @@ func (f Format) Open(r io.ReadSeekCloser) (audio.Source, error) {
 	return source, nil
 }
 
-func (f Format) Identify(peek []byte, extension string) bool {
+func (f Format) Identify(peek [format.IdentifyPeekBytes]byte, extension string) bool {
 	return bytes.Compare(peek[:4], []byte{'O', 'g', 'g', 'S'}) == 0 || extension == "vorbis" || extension == "ogg"
 }