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https://github.com/alfg/mp4-rust.git
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56cc260a5c
Initial effort to reduce or eliminate the use of assertions in the production code (i.e. not test code). See issue 43 for an example of how this can cause an application (thread) to panic when reading an unusual file. Not all of the changes were as simple as returning an Err, since some functions did not return a Result. Also, the error type used (InvalidData) is just a catch-all with a message, and in some cases a more refined error type may be in order. cargo test passes
149 lines
3.7 KiB
Rust
149 lines
3.7 KiB
Rust
use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
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use std::io::{Read, Seek, Write};
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use serde::{Serialize};
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use crate::mp4box::*;
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#[derive(Debug, Clone, PartialEq, Serialize)]
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pub struct MehdBox {
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pub version: u8,
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pub flags: u32,
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pub fragment_duration: u64,
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}
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impl MehdBox {
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pub fn get_type(&self) -> BoxType {
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BoxType::MehdBox
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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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if self.version == 1 {
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size += 8;
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} else if self.version == 0 {
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size += 4;
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}
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size
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}
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}
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impl Default for MehdBox {
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fn default() -> Self {
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MehdBox {
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version: 0,
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flags: 0,
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fragment_duration: 0,
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}
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}
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}
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impl Mp4Box for MehdBox {
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fn box_type(&self) -> BoxType {
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return self.get_type();
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}
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fn box_size(&self) -> u64 {
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return 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 = format!("fragment_duration={}", self.fragment_duration);
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Ok(s)
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}
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}
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impl<R: Read + Seek> ReadBox<&mut R> for MehdBox {
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fn read_box(reader: &mut R, size: u64) -> Result<Self> {
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let start = box_start(reader)?;
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let (version, flags) = read_box_header_ext(reader)?;
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let fragment_duration = if version == 1 {
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reader.read_u64::<BigEndian>()?
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} else if version == 0 {
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reader.read_u32::<BigEndian>()? as u64
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} else {
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return Err(Error::InvalidData("version must be 0 or 1"));
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};
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skip_bytes_to(reader, start + size)?;
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Ok(MehdBox {
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version,
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flags,
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fragment_duration,
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})
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}
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}
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impl<W: Write> WriteBox<&mut W> for MehdBox {
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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.box_type(), size).write(writer)?;
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write_box_header_ext(writer, self.version, self.flags)?;
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if self.version == 1 {
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writer.write_u64::<BigEndian>(self.fragment_duration)?;
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} else if self.version == 0 {
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writer.write_u32::<BigEndian>(self.fragment_duration as u32)?;
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} else {
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return Err(Error::InvalidData("version must be 0 or 1"));
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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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use std::io::Cursor;
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#[test]
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fn test_mehd32() {
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let src_box = MehdBox {
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version: 0,
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flags: 0,
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fragment_duration: 32,
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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 = Cursor::new(&buf);
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let header = BoxHeader::read(&mut reader).unwrap();
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assert_eq!(header.name, BoxType::MehdBox);
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assert_eq!(src_box.box_size(), header.size);
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let dst_box = MehdBox::read_box(&mut reader, header.size).unwrap();
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assert_eq!(src_box, dst_box);
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}
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#[test]
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fn test_mehd64() {
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let src_box = MehdBox {
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version: 0,
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flags: 0,
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fragment_duration: 30439936,
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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 = Cursor::new(&buf);
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let header = BoxHeader::read(&mut reader).unwrap();
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assert_eq!(header.name, BoxType::MehdBox);
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assert_eq!(src_box.box_size(), header.size);
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let dst_box = MehdBox::read_box(&mut reader, header.size).unwrap();
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assert_eq!(src_box, dst_box);
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}
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}
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