mirror of
https://github.com/alfg/mp4-rust.git
synced 2024-05-20 01:08:06 +00:00
247 lines
7.2 KiB
Rust
247 lines
7.2 KiB
Rust
use serde::Serialize;
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use crate::mp4box::hdlr::HdlrBox;
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use crate::mp4box::ilst::IlstBox;
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use crate::mp4box::*;
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#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
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#[serde(tag = "hdlr")]
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#[serde(rename_all = "lowercase")]
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pub enum MetaBox {
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Mdir {
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#[serde(skip_serializing_if = "Option::is_none")]
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ilst: Option<IlstBox>,
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},
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#[serde(skip)]
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Unknown {
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#[serde(skip)]
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hdlr: HdlrBox,
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#[serde(skip)]
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data: Vec<(BoxType, Vec<u8>)>,
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},
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}
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const MDIR: FourCC = FourCC { value: *b"mdir" };
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impl MetaBox {
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pub fn get_type(&self) -> BoxType {
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BoxType::MetaBox
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}
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pub fn get_size(&self) -> u64 {
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let mut size = HEADER_SIZE + HEADER_EXT_SIZE;
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match self {
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Self::Mdir { ilst } => {
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size += HdlrBox::default().box_size();
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if let Some(ilst) = ilst {
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size += ilst.box_size();
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}
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}
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Self::Unknown { hdlr, data } => {
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size += hdlr.box_size()
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+ data
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.iter()
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.map(|(_, data)| data.len() as u64 + HEADER_SIZE)
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.sum::<u64>()
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}
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}
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size
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}
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}
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impl Mp4Box for MetaBox {
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const TYPE: BoxType = BoxType::MetaBox;
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fn box_size(&self) -> u64 {
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self.get_size()
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}
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fn to_json(&self) -> Result<String> {
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Ok(serde_json::to_string(&self).unwrap())
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}
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fn summary(&self) -> Result<String> {
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let s = match self {
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Self::Mdir { .. } => "hdlr=ilst".to_string(),
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Self::Unknown { hdlr, data } => {
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format!("hdlr={} data_len={}", hdlr.handler_type, data.len())
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}
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};
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Ok(s)
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}
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}
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impl Default for MetaBox {
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fn default() -> Self {
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Self::Unknown {
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hdlr: Default::default(),
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data: Default::default(),
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}
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}
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}
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impl BlockReader for MetaBox {
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fn read_block<'a>(reader: &mut impl Reader<'a>) -> Result<Self> {
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let extended_header = reader.get_u32();
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if extended_header != 0 {
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// ISO mp4 requires this header (version & flags) to be 0. Some
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// files skip the extended header and directly start the hdlr box.
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let possible_hdlr = BoxType::from(reader.try_get_u32()?);
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if possible_hdlr == BoxType::HdlrBox {
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// This file skipped the extended header! Go back to start.
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// reader.seek(SeekFrom::Current(-8))?;
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} else {
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// Looks like we actually have a bad version number or flags.
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let v = (extended_header >> 24) as u8;
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return Err(Error::UnsupportedBoxVersion(BoxType::MetaBox, v));
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}
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}
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// find the hdlr box
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let hdlr = reader.find_box::<HdlrBox>()?;
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Ok(match hdlr.handler_type {
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MDIR => MetaBox::Mdir {
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ilst: reader.try_find_box::<IlstBox>()?,
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},
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_ => {
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let mut data = Vec::new();
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while let Some(mut bx) = reader.get_box()? {
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data.push((bx.kind, bx.inner.collect_remaining()))
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}
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MetaBox::Unknown { hdlr, data }
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}
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})
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}
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fn size_hint() -> usize {
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4
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}
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}
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impl<W: Write> WriteBox<&mut W> for MetaBox {
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fn write_box(&self, writer: &mut W) -> Result<u64> {
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let size = self.box_size();
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BoxHeader::new(Self::TYPE, size).write(writer)?;
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write_box_header_ext(writer, 0, 0)?;
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let hdlr = match self {
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Self::Mdir { .. } => HdlrBox {
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handler_type: MDIR,
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..Default::default()
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},
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Self::Unknown { hdlr, .. } => hdlr.clone(),
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};
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hdlr.write_box(writer)?;
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match self {
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Self::Mdir { ilst } => {
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if let Some(ilst) = ilst {
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ilst.write_box(writer)?;
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}
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}
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Self::Unknown { data, .. } => {
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for (box_type, data) in data {
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BoxHeader::new(*box_type, data.len() as u64 + HEADER_SIZE).write(writer)?;
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writer.write_all(data)?;
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}
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}
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}
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Ok(size)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::mp4box::BoxHeader;
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#[test]
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fn test_meta_mdir_empty() {
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let src_box = MetaBox::Mdir { ilst: None };
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let mut buf = Vec::new();
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src_box.write_box(&mut buf).unwrap();
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assert_eq!(buf.len(), src_box.box_size() as usize);
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let mut reader = buf.as_slice();
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let header = BoxHeader::read_sync(&mut reader).unwrap().unwrap();
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assert_eq!(header.kind, BoxType::MetaBox);
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assert_eq!(header.size, src_box.box_size());
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let dst_box = MetaBox::read_block(&mut reader).unwrap();
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assert_eq!(dst_box, src_box);
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}
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#[test]
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fn test_meta_mdir() {
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let src_box = MetaBox::Mdir {
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ilst: Some(IlstBox::default()),
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};
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let mut buf = Vec::new();
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src_box.write_box(&mut buf).unwrap();
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assert_eq!(buf.len(), src_box.box_size() as usize);
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let mut reader = buf.as_slice();
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let header = BoxHeader::read_sync(&mut reader).unwrap().unwrap();
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assert_eq!(header.kind, BoxType::MetaBox);
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assert_eq!(header.size, src_box.box_size());
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let dst_box = MetaBox::read_block(&mut reader).unwrap();
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assert_eq!(dst_box, src_box);
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}
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#[test]
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fn test_meta_hdrl_non_first() {
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let data = b"\x00\x00\x00\x7fmeta\x00\x00\x00\x00\x00\x00\x00Qilst\x00\x00\x00I\xa9too\x00\x00\x00Adata\x00\x00\x00\x01\x00\x00\x00\x00TMPGEnc Video Mastering Works 7 Version 7.0.15.17\x00\x00\x00\"hdlr\x00\x00\x00\x00\x00\x00\x00\x00mdirappl\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
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let mut reader = data.as_slice();
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let header = BoxHeader::read_sync(&mut reader).unwrap().unwrap();
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assert_eq!(header.kind, BoxType::MetaBox);
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let meta_box = MetaBox::read_block(&mut reader).unwrap();
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// this contains \xa9too box in the ilst
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// it designates the tool that created the file, but is not yet supported by this crate
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assert_eq!(
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meta_box,
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MetaBox::Mdir {
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ilst: Some(IlstBox::default())
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}
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);
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}
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#[test]
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fn test_meta_unknown() {
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let src_hdlr = HdlrBox {
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handler_type: FourCC::from(*b"test"),
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..Default::default()
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};
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let src_data = (BoxType::UnknownBox(0x42494241), b"123".to_vec());
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let src_box = MetaBox::Unknown {
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hdlr: src_hdlr,
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data: vec![src_data],
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};
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let mut buf = Vec::new();
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src_box.write_box(&mut buf).unwrap();
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assert_eq!(buf.len(), src_box.box_size() as usize);
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let mut reader = buf.as_slice();
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let header = BoxHeader::read_sync(&mut reader).unwrap().unwrap();
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assert_eq!(header.kind, BoxType::MetaBox);
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assert_eq!(header.size, src_box.box_size());
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let dst_box = MetaBox::read_block(&mut reader).unwrap();
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assert_eq!(dst_box, src_box);
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}
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}
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