Feature/tfdt box (#90)

* Add Tfdt box parsing

* Derive Default for TfdtBox

* Derive Eq for TfdtBox

src/mp4box/mod.rs

@@ -50,6 +50,7 @@
 //!     mfhd
 //!     traf
 //!         tfhd
+//!         tfdt
 //!         trun
 //! mdat
 //! free
@@ -92,6 +93,7 @@ pub(crate) mod stsd;
 pub(crate) mod stss;
 pub(crate) mod stsz;
 pub(crate) mod stts;
+pub(crate) mod tfdt;
 pub(crate) mod tfhd;
 pub(crate) mod tkhd;
 pub(crate) mod traf;
@@ -155,6 +157,7 @@ boxtype! {
     MoofBox => 0x6d6f6f66,
     TkhdBox => 0x746b6864,
     TfhdBox => 0x74666864,
+    TfdtBox => 0x74666474,
     EdtsBox => 0x65647473,
     MdiaBox => 0x6d646961,
     ElstBox => 0x656c7374,

src/mp4box/tfdt.rs

@@ -0,0 +1,137 @@
+use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
+use serde::Serialize;
+use std::io::{Read, Seek, Write};
+
+use crate::mp4box::*;
+
+#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize)]
+pub struct TfdtBox {
+    pub version: u8,
+    pub flags: u32,
+    pub base_media_decode_time: u64,
+}
+
+impl TfdtBox {
+    pub fn get_type(&self) -> BoxType {
+        BoxType::TfdtBox
+    }
+
+    pub fn get_size(&self) -> u64 {
+        let mut sum = HEADER_SIZE + HEADER_EXT_SIZE;
+        if self.version == 1 {
+            sum += 8;
+        } else {
+            sum += 4;
+        }
+        sum
+    }
+}
+
+impl Mp4Box for TfdtBox {
+    fn box_type(&self) -> BoxType {
+        self.get_type()
+    }
+
+    fn box_size(&self) -> u64 {
+        self.get_size()
+    }
+
+    fn to_json(&self) -> Result<String> {
+        Ok(serde_json::to_string(&self).unwrap())
+    }
+
+    fn summary(&self) -> Result<String> {
+        let s = format!("base_media_decode_time={}", self.base_media_decode_time);
+        Ok(s)
+    }
+}
+
+impl<R: Read + Seek> ReadBox<&mut R> for TfdtBox {
+    fn read_box(reader: &mut R, size: u64) -> Result<Self> {
+        let start = box_start(reader)?;
+
+        let (version, flags) = read_box_header_ext(reader)?;
+
+        let base_media_decode_time = if version == 1 {
+            reader.read_u64::<BigEndian>()?
+        } else if version == 0 {
+            reader.read_u32::<BigEndian>()? as u64
+        } else {
+            return Err(Error::InvalidData("version must be 0 or 1"));
+        };
+
+        skip_bytes_to(reader, start + size)?;
+
+        Ok(TfdtBox {
+            version,
+            flags,
+            base_media_decode_time,
+        })
+    }
+}
+
+impl<W: Write> WriteBox<&mut W> for TfdtBox {
+    fn write_box(&self, writer: &mut W) -> Result<u64> {
+        let size = self.box_size();
+        BoxHeader::new(self.box_type(), size).write(writer)?;
+
+        write_box_header_ext(writer, self.version, self.flags)?;
+
+        if self.version == 1 {
+            writer.write_u64::<BigEndian>(self.base_media_decode_time)?;
+        } else if self.version == 0 {
+            writer.write_u32::<BigEndian>(self.base_media_decode_time as u32)?;
+        } else {
+            return Err(Error::InvalidData("version must be 0 or 1"));
+        }
+
+        Ok(size)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::mp4box::BoxHeader;
+    use std::io::Cursor;
+
+    #[test]
+    fn test_tfdt32() {
+        let src_box = TfdtBox {
+            version: 0,
+            flags: 0,
+            base_media_decode_time: 0,
+        };
+        let mut buf = Vec::new();
+        src_box.write_box(&mut buf).unwrap();
+        assert_eq!(buf.len(), src_box.box_size() as usize);
+
+        let mut reader = Cursor::new(&buf);
+        let header = BoxHeader::read(&mut reader).unwrap();
+        assert_eq!(header.name, BoxType::TfdtBox);
+        assert_eq!(src_box.box_size(), header.size);
+
+        let dst_box = TfdtBox::read_box(&mut reader, header.size).unwrap();
+        assert_eq!(src_box, dst_box);
+    }
+
+    #[test]
+    fn test_tfdt64() {
+        let src_box = TfdtBox {
+            version: 1,
+            flags: 0,
+            base_media_decode_time: 0,
+        };
+        let mut buf = Vec::new();
+        src_box.write_box(&mut buf).unwrap();
+        assert_eq!(buf.len(), src_box.box_size() as usize);
+
+        let mut reader = Cursor::new(&buf);
+        let header = BoxHeader::read(&mut reader).unwrap();
+        assert_eq!(header.name, BoxType::TfdtBox);
+        assert_eq!(src_box.box_size(), header.size);
+
+        let dst_box = TfdtBox::read_box(&mut reader, header.size).unwrap();
+        assert_eq!(src_box, dst_box);
+    }
+}

src/mp4box/traf.rs

@@ -2,11 +2,12 @@ use serde::Serialize;
 use std::io::{Read, Seek, SeekFrom, Write};
 
 use crate::mp4box::*;
-use crate::mp4box::{tfhd::TfhdBox, trun::TrunBox};
+use crate::mp4box::{tfdt::TfdtBox, tfhd::TfhdBox, trun::TrunBox};
 
 #[derive(Debug, Clone, PartialEq, Eq, Default, Serialize)]
 pub struct TrafBox {
     pub tfhd: TfhdBox,
+    pub tfdt: Option<TfdtBox>,
     pub trun: Option<TrunBox>,
 }
 
@@ -49,6 +50,7 @@ impl<R: Read + Seek> ReadBox<&mut R> for TrafBox {
         let start = box_start(reader)?;
 
         let mut tfhd = None;
+        let mut tfdt = None;
         let mut trun = None;
 
         let mut current = reader.seek(SeekFrom::Current(0))?;
@@ -62,6 +64,9 @@ impl<R: Read + Seek> ReadBox<&mut R> for TrafBox {
                 BoxType::TfhdBox => {
                     tfhd = Some(TfhdBox::read_box(reader, s)?);
                 }
+                BoxType::TfdtBox => {
+                    tfdt = Some(TfdtBox::read_box(reader, s)?);
+                }
                 BoxType::TrunBox => {
                     trun = Some(TrunBox::read_box(reader, s)?);
                 }
@@ -82,6 +87,7 @@ impl<R: Read + Seek> ReadBox<&mut R> for TrafBox {
 
         Ok(TrafBox {
             tfhd: tfhd.unwrap(),
+            tfdt,
             trun,
         })
     }