public static Mp4Box CreateMp4Box(byte[] buffer, int offset)
{
if ((buffer != null) &&
(offset + 8 < buffer.Length))
{
Mp4Box box = CreateMp4BoxFromType(ReadMp4BoxType(buffer, offset));
if (box != null)
{
box.Length = ReadMp4BoxLength(buffer, offset);
if ((offset + box.Length <= buffer.Length) && (box.Length > 8))
{
box.Type = ReadMp4BoxType(buffer, offset);
box.SetPath("/" + box.GetBoxType());
box.Data = ReadMp4BoxData(buffer, offset, box.Length);
List <Mp4Box> list = box.GetChildren();
if ((list != null) && (list.Count > 0))
{
foreach (var b in list)
{
box.AddMp4Box(b);
}
}
return(box);
}
}
}
return(null);
}
public static Mp4Box ReadMp4Box(FileStream fs)
{
Mp4Box box = null;
if (fs != null)
{
byte[] buffer = new byte[4];
if (buffer != null)
{
if (fs.Read(buffer, 0, 4) == 4)
{
int mp4BoxLen = 0;
mp4BoxLen |= (int)(buffer[0] << 24);
mp4BoxLen |= (int)(buffer[1] << 16);
mp4BoxLen |= (int)(buffer[2] << 8);
mp4BoxLen |= (int)(buffer[3] << 0);
if (mp4BoxLen >= 8)
{
buffer = new byte[mp4BoxLen];
if (buffer != null)
{
WriteMp4BoxInt32(buffer, 0, mp4BoxLen);
if (fs.Read(buffer, 4, mp4BoxLen - 4) == (mp4BoxLen - 4))
{
return(CreateMp4Box(buffer, 0));
}
}
}
}
}
}
return(box);
}
public void UpdateParentLength(Mp4Box box, int Len)
{
Mp4Box pbox = box.GetParent();
while (pbox != null)
{
pbox.SetBoxLength(pbox.GetBoxLength() + Len);
pbox = pbox.GetParent();
}
}
public static Mp4Box CreateEmptyMp4Box(string Type)
{
Mp4Box box = new Mp4Box();
if (box != null)
{
box.Length = 8;
if (!string.IsNullOrEmpty(Type) &&
(Type.Length <= 4))
{
box.Type = Type;
return(box);
}
}
return(null);
}
public bool AddMp4Box(Mp4Box box, bool bAddInData = false)
{
if (Children == null)
{
Children = new List <Mp4Box>();
}
if (Children != null)
{
box.SetParent(this);
box.SetPath(this.GetPath() + "/" + box.GetBoxType());
Children.Add(box);
if (bAddInData == true)
{
Append(box.Data);
}
return(true);
}
return(false);
}
public List <Mp4Box> GetChildren()
{
List <Mp4Box> list = new List <Mp4Box>();
if ((list != null) && (Data != null))
{
ChildrenOffset = 0;
if (this.GetBoxType() == "stsd")
{
ChildrenOffset = 8;
}
else if (this.GetBoxType() == "dref")
{
ChildrenOffset = 8;
}
else if (this.GetBoxType() == "encv")
{
ChildrenOffset = 78;
}
else if (this.GetBoxType() == "enca")
{
ChildrenOffset = 28;
}
int Offset = ChildrenOffset;
while (Offset < Data.Length)
{
Mp4Box box = CreateMp4Box(Data, Offset);
if (box != null)
{
list.Add(box);
Offset += box.Length;
}
else
{
break;
}
}
}
return(list);
}
public static bool WriteMp4Box(Mp4Box box, FileStream fs)
{
bool result = false;
if ((box != null) && (fs != null))
{
try
{
byte[] header = new byte[8];
Mp4Box.WriteMp4BoxInt32(header, 0, box.Length);
Mp4Box.WriteMp4BoxString(header, 4, box.GetBoxType());
fs.Write(header, 0, 8);
fs.Write(box.Data, 0, box.Data.Length);
result = true;
}
catch (Exception ex)
{
System.Diagnostics.Debug.Write("Exception while writing box in file: " + ex.Message);
}
}
return(result);
}
public Mp4Box GetChild(string type)
{
if (Children != null)
{
foreach (var box in Children)
{
if (box.GetBoxType() == type)
{
return(box);
}
else
{
Mp4Box childbox = box.GetChild(type);
if (childbox != null)
{
return(childbox);
}
}
}
}
return(null);
}
public Mp4Box FindChildBox(string BoxType)
{
if (Children != null)
{
foreach (var box in Children)
{
if (box.GetBoxType() == BoxType)
{
return(box);
}
else
{
Mp4Box ChildBox = box.FindChildBox(BoxType);
if (ChildBox != null)
{
return(ChildBox);
}
}
}
}
return(null);
}
public static string GetBoxChildrenString(int level, Mp4Box box)
{
string result = string.Empty;
int locallevel = level + 1;
if (box != null)
{
List <Mp4Box> list = box.GetChildren();
if ((list != null) && (list.Count > 0))
{
foreach (var m in list)
{
string prefix = string.Empty;
for (int i = 0; i < locallevel; i++)
{
prefix += "\t\t";
}
result += prefix + m.ToString() + "\r\n";
result += GetBoxChildrenString(locallevel, m);
}
}
}
return(result);
}
public void SetParent(Mp4Box box)
{
this.Path = box.GetPath() + "/" + this.GetBoxType();
Parent = box;
}
