mirror of
https://github.com/alfg/mp4-rust.git
synced 2024-05-09 03:52:53 +00:00
19e4eaa3c8
* Extract esds from wave box * Allow empty, multi-byte, and arbitrary NUL terminated strings * Skip unsupported avc1 sub-boxes * Fixed non-integer framerates * Fixed bitrate calculation * Fixed format issue * Public read sample offset * Fix lint warning. --------- Co-authored-by: Alfred Gutierrez <alfg@users.noreply.github.com>
174 lines
4.9 KiB
Rust
174 lines
4.9 KiB
Rust
use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
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use serde::Serialize;
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use std::io::{Read, Seek, Write};
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use crate::mp4box::*;
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#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize)]
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pub struct HdlrBox {
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pub version: u8,
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pub flags: u32,
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pub handler_type: FourCC,
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pub name: String,
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}
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impl HdlrBox {
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pub fn get_type(&self) -> BoxType {
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BoxType::HdlrBox
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}
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pub fn get_size(&self) -> u64 {
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HEADER_SIZE + HEADER_EXT_SIZE + 20 + self.name.len() as u64 + 1
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}
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}
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impl Mp4Box for HdlrBox {
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fn box_type(&self) -> BoxType {
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self.get_type()
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}
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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 = format!("handler_type={} name={}", self.handler_type, self.name);
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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 HdlrBox {
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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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reader.read_u32::<BigEndian>()?; // pre-defined
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let handler = reader.read_u32::<BigEndian>()?;
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skip_bytes(reader, 12)?; // reserved
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let buf_size = size
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.checked_sub(HEADER_SIZE + HEADER_EXT_SIZE + 20)
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.ok_or(Error::InvalidData("hdlr size too small"))?;
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let mut buf = vec![0u8; buf_size as usize];
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reader.read_exact(&mut buf)?;
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if let Some(end) = buf.iter().position(|&b| b == b'\0') {
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buf.truncate(end);
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}
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let handler_string = String::from_utf8(buf).unwrap_or_default();
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skip_bytes_to(reader, start + size)?;
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Ok(HdlrBox {
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version,
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flags,
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handler_type: From::from(handler),
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name: handler_string,
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})
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}
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}
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impl<W: Write> WriteBox<&mut W> for HdlrBox {
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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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writer.write_u32::<BigEndian>(0)?; // pre-defined
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writer.write_u32::<BigEndian>((&self.handler_type).into())?;
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// 12 bytes reserved
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for _ in 0..3 {
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writer.write_u32::<BigEndian>(0)?;
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}
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writer.write_all(self.name.as_bytes())?;
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writer.write_u8(0)?;
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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_hdlr() {
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let src_box = HdlrBox {
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version: 0,
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flags: 0,
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handler_type: str::parse::<FourCC>("vide").unwrap(),
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name: String::from("VideoHandler"),
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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::HdlrBox);
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assert_eq!(src_box.box_size(), header.size);
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let dst_box = HdlrBox::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_hdlr_empty() {
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let src_box = HdlrBox {
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version: 0,
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flags: 0,
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handler_type: str::parse::<FourCC>("vide").unwrap(),
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name: String::new(),
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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::HdlrBox);
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assert_eq!(src_box.box_size(), header.size);
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let dst_box = HdlrBox::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_hdlr_extra() {
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let real_src_box = HdlrBox {
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version: 0,
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flags: 0,
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handler_type: str::parse::<FourCC>("vide").unwrap(),
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name: String::from("Good"),
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};
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let src_box = HdlrBox {
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version: 0,
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flags: 0,
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handler_type: str::parse::<FourCC>("vide").unwrap(),
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name: String::from_utf8(b"Good\0Bad".to_vec()).unwrap(),
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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::HdlrBox);
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assert_eq!(src_box.box_size(), header.size);
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let dst_box = HdlrBox::read_box(&mut reader, header.size).unwrap();
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assert_eq!(real_src_box, dst_box);
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}
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}
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