diff --git a/atom/otherStruct.go b/atom/otherStruct.go
index c5b298e..77e6093 100644
--- a/atom/otherStruct.go
+++ b/atom/otherStruct.go
@@ -7,66 +7,6 @@ import (
 	"github.com/nareix/bits"
 )
 
-type GolombBitReader struct {
-	R    io.Reader
-	buf  [1]byte
-	left byte
-}
-
-func (self *GolombBitReader) ReadBit() (res uint, err error) {
-	if self.left == 0 {
-		if _, err = self.R.Read(self.buf[:]); err != nil {
-			return
-		}
-		self.left = 8
-	}
-	self.left--
-	res = uint(self.buf[0]>>self.left) & 1
-	return
-}
-
-func (self *GolombBitReader) ReadBits(n int) (res uint, err error) {
-	for i := 0; i < n; i++ {
-		var bit uint
-		if bit, err = self.ReadBit(); err != nil {
-			return
-		}
-		res |= bit << uint(n-i-1)
-	}
-	return
-}
-
-func (self *GolombBitReader) ReadExponentialGolombCode() (res uint, err error) {
-	i := 0
-	for {
-		var bit uint
-		if bit, err = self.ReadBit(); err != nil {
-			return
-		}
-		if !(bit == 0 && i < 32) {
-			break
-		}
-		i++
-	}
-	if res, err = self.ReadBits(i); err != nil {
-		return
-	}
-	res += (1 << uint(i)) - 1
-	return
-}
-
-func (self *GolombBitReader) ReadSE() (res uint, err error) {
-	if res, err = self.ReadExponentialGolombCode(); err != nil {
-		return
-	}
-	if res&0x01 != 0 {
-		res = (res + 1) / 2
-	} else {
-		res = -res / 2
-	}
-	return
-}
-
 type H264SPSInfo struct {
 	ProfileIdc uint
 	LevelIdc   uint
@@ -84,7 +24,7 @@ type H264SPSInfo struct {
 }
 
 func ParseH264SPS(data []byte) (res *H264SPSInfo, err error) {
-	r := &GolombBitReader{
+	r := &bits.GolombBitReader{
 		R: bytes.NewReader(data),
 	}
 
@@ -285,18 +225,6 @@ type AVCDecoderConfRecord struct {
 	PPS                  [][]byte
 }
 
-func WriteSampleByNALU(w io.Writer, nalu []byte) (size int, err error) {
-	if err = WriteInt(w, len(nalu), 4); err != nil {
-		return
-	}
-	size += 4
-	if _, err = w.Write(nalu); err != nil {
-		return
-	}
-	size += len(nalu)
-	return
-}
-
 func CreateAVCDecoderConfRecord(
 	SPS []byte,
 	PPS []byte,
@@ -412,6 +340,18 @@ func ReadAVCDecoderConfRecord(r *io.LimitedReader) (self AVCDecoderConfRecord, e
 	return
 }
 
+func WriteSampleByNALU(w io.Writer, nalu []byte) (size int, err error) {
+	if err = WriteInt(w, len(nalu), 4); err != nil {
+		return
+	}
+	size += 4
+	if _, err = w.Write(nalu); err != nil {
+		return
+	}
+	size += len(nalu)
+	return
+}
+
 const (
 	TFHD_BASE_DATA_OFFSET     = 0x01
 	TFHD_STSD_ID              = 0x02