diff --git a/atom/genStruct.js b/atom/genStruct.js
index e856fc6..95ad682 100644
--- a/atom/genStruct.js
+++ b/atom/genStruct.js
@@ -11,6 +11,13 @@ var atoms = {
 			['version', 'int8'],
 			['flags', 'int24'],
 			['left', '[]char'],
+
+			['$atomsCount', 'int32'],
+
+			['$atoms', [
+				['header', '*movieHeader'],
+				['tracks', '[]*track'],
+			]],
 		],
 	},
 
@@ -324,6 +331,8 @@ var DeclReadFunc = (opts) => {
 			return CallCheckAssign('ReadDummy', ['r', type.len], ['_']);
 		if (name == '$atoms')
 			return ReadAtoms(type.list);
+		if (name == '$atomsCount')
+			return CallCheckAssign('ReadDummy', ['r', type.len], ['_']);
 		if (type.arr && type.fn != 'Bytes')
 			return ReadArr('self.'+name, type);
 		return ReadCommnType('self.'+name, type);
@@ -365,6 +374,7 @@ var DeclWriteFunc = (opts) => {
 		return [
 			`if ${name} != nil {`,
 			field.type.arr ? WriteArr(name, field.type) : WriteCommnType(name, field.type),
+			atomsCount && `${atomsCount.name}++`,
 			`}`,
 		];
 	});
@@ -388,17 +398,45 @@ var DeclWriteFunc = (opts) => {
 		]
 	};
 
+	var atomsCount;
+
+	var WriteAtomsCountStart = (type) => {
+		atomsCount = {
+			name: 'atomsCount',
+			namePos: 'atomsCountPos',
+			type: type,
+		}
+		return [
+			DeclVar(atomsCount.name, 'int'),
+			DeclVar(atomsCount.namePos, 'int64'),
+			CallCheckAssign('WriteEmptyInt', ['w', type.len], [atomsCount.namePos]),
+		];
+	};
+
+	var WriteAtomsCountEnd = (type) => {
+		return [
+			CallCheckAssign('RefillInt', 
+				['w', atomsCount.namePos, atomsCount.name, atomsCount.type.len],
+				[]
+			),
+		];
+	};
+
 	var WriteField = (name, type) => {
 		if (name == '_')
 			return CallCheckAssign('WriteDummy', ['w', type.len], []);
 		if (name == '$atoms')
 			return WriteAtoms(type.list);
+		if (name == '$atomsCount')
+			return WriteAtomsCountStart(type);
 		if (type.arr && type.fn != 'Bytes')
 			return WriteArr('self.'+name, type);
 		return WriteCommnType('self.'+name, type);
 	};
 
-	var WriteFields = () => opts.fields.map(field => WriteField(field.name, field.type));
+	var WriteFields = () => opts.fields
+		.map(field => WriteField(field.name, field.type))
+		.concat(atomsCount && WriteAtomsCountEnd())
 
 	return Func(
 		'Write'+opts.type,
@@ -561,6 +599,8 @@ var allStmts = () => {
 	var genStructFields = fields => fields.map(field => {
 		if (field.name == '_')
 			return;
+		if (field.name == '$atomsCount')
+			return;
 		if (field.name == '$atoms')
 			return field.type.list;
 		return [field];
diff --git a/atom/struct.go b/atom/struct.go
index 118c815..06189c0 100644
--- a/atom/struct.go
+++ b/atom/struct.go
@@ -9,6 +9,8 @@ type Test struct {
 	Version int
 	Flags   int
 	Left    string
+	Header  *MovieHeader
+	Tracks  []*Track
 }
 
 func ReadTest(r *io.LimitedReader) (res *Test, err error) {
@@ -23,6 +25,36 @@ func ReadTest(r *io.LimitedReader) (res *Test, err error) {
 	if self.Left, err = ReadString(r, int(r.N)); err != nil {
 		return
 	}
+	if _, err = ReadDummy(r, 4); err != nil {
+		return
+	}
+	for r.N > 0 {
+		var cc4 string
+		var ar *io.LimitedReader
+		if ar, cc4, err = ReadAtomHeader(r, ""); err != nil {
+			return
+		}
+		switch cc4 {
+		case "mvhd":
+			{
+				if self.Header, err = ReadMovieHeader(ar); err != nil {
+					return
+				}
+			}
+		case "trak":
+			{
+				var item *Track
+				if item, err = ReadTrack(ar); err != nil {
+					return
+				}
+				self.Tracks = append(self.Tracks, item)
+			}
+
+		}
+		if _, err = ReadDummy(ar, int(ar.N)); err != nil {
+			return
+		}
+	}
 	res = self
 	return
 }
@@ -42,6 +74,28 @@ func WriteTest(w io.WriteSeeker, self *Test) (err error) {
 	if err = WriteString(w, self.Left, len(self.Left)); err != nil {
 		return
 	}
+	var atomsCount int
+	var atomsCountPos int64
+	if atomsCountPos, err = WriteEmptyInt(w, 4); err != nil {
+		return
+	}
+	if self.Header != nil {
+		if err = WriteMovieHeader(w, self.Header); err != nil {
+			return
+		}
+		atomsCount++
+	}
+	if self.Tracks != nil {
+		for _, elem := range self.Tracks {
+			if err = WriteTrack(w, elem); err != nil {
+				return
+			}
+		}
+		atomsCount++
+	}
+	if err = RefillInt(w, atomsCountPos, atomsCount, 4); err != nil {
+		return
+	}
 	if err = aw.Close(); err != nil {
 		return
 	}
diff --git a/atom/writer.go b/atom/writer.go
index 367c1a0..f50ca06 100644
--- a/atom/writer.go
+++ b/atom/writer.go
@@ -48,28 +48,28 @@ type Writer struct {
 	sizePos int64
 }
 
-func (self *Writer) WriteEmptyInt(n int) (pos int64, err error) {
-	if pos, err = self.Seek(0, 1); err != nil {
+func WriteEmptyInt(w io.WriteSeeker, n int) (pos int64, err error) {
+	if pos, err = w.Seek(0, 1); err != nil {
 		return
 	}
-	if err = WriteInt(self, 0, n); err != nil {
+	if err = WriteInt(w, 0, n); err != nil {
 		return
 	}
 	return
 }
 
-func (self *Writer) RefillInt(pos int64, val int, n int) (err error) {
+func RefillInt(w io.WriteSeeker, pos int64, val int, n int) (err error) {
 	var curPos int64
-	if curPos, err = self.Seek(0, 1); err != nil {
+	if curPos, err = w.Seek(0, 1); err != nil {
 		return
 	}
-	if _, err = self.Seek(pos, 0); err != nil {
+	if _, err = w.Seek(pos, 0); err != nil {
 		return
 	}
-	if err = WriteInt(self, val, n); err != nil {
+	if err = WriteInt(w, val, n); err != nil {
 		return
 	}
-	if _, err = self.Seek(curPos, 0); err != nil {
+	if _, err = w.Seek(curPos, 0); err != nil {
 		return
 	}
 	return
@@ -80,7 +80,7 @@ func (self *Writer) Close() (err error) {
 	if curPos, err = self.Seek(0, 1); err != nil {
 		return
 	}
-	if err = self.RefillInt(self.sizePos, int(curPos - self.sizePos), 4); err != nil {
+	if err = RefillInt(self, self.sizePos, int(curPos - self.sizePos), 4); err != nil {
 		return
 	}
 	if false {
@@ -92,7 +92,7 @@ func (self *Writer) Close() (err error) {
 func WriteAtomHeader(w io.WriteSeeker, cc4 string) (res *Writer, err error) {
 	self := &Writer{WriteSeeker: w}
 
-	if self.sizePos, err = self.WriteEmptyInt(4); err != nil {
+	if self.sizePos, err = WriteEmptyInt(w, 4); err != nil {
 		return
 	}
 	if err = WriteString(self, cc4, 4); err != nil {