mirror of
https://github.com/alfg/mp4-rust.git
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105 lines
3.1 KiB
Rust
105 lines
3.1 KiB
Rust
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use std::io::{BufReader, SeekFrom, Seek, Read, BufWriter, Write};
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use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
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use crate::*;
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#[derive(Debug, Default)]
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pub struct ElstBox {
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pub version: u8,
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pub flags: u32,
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pub entry_count: u32,
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pub entries: Vec<ElstEntry>,
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}
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#[derive(Debug, Default)]
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pub struct ElstEntry {
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pub segment_duration: u64,
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pub media_time: u64,
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pub media_rate: u16,
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pub media_rate_fraction: u16,
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}
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impl Mp4Box for ElstBox {
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fn box_type(&self) -> BoxType {
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BoxType::ElstBox
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}
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fn box_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 += self.entry_count as u64 * 20;
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} else {
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assert_eq!(self.version, 0);
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size += self.entry_count as u64 * 12;
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}
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size
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}
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}
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impl<R: Read + Seek> ReadBox<&mut BufReader<R>> for ElstBox {
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fn read_box(reader: &mut BufReader<R>, size: u64) -> Result<Self> {
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let current = reader.seek(SeekFrom::Current(0))?; // Current cursor position.
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let (version, flags) = read_box_header_ext(reader)?;
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let entry_count = reader.read_u32::<BigEndian>()?;
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let mut entries = Vec::with_capacity(entry_count as usize);
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for _ in 0..entry_count {
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let (segment_duration, media_time)
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= if version == 1 {
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(
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reader.read_u64::<BigEndian>()?,
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reader.read_u64::<BigEndian>()?,
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)
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} else {
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(
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reader.read_u32::<BigEndian>()? as u64,
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reader.read_u32::<BigEndian>()? as u64,
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)
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};
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let entry = ElstEntry{
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segment_duration,
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media_time,
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media_rate: reader.read_u16::<BigEndian>()?,
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media_rate_fraction: reader.read_u16::<BigEndian>()?,
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};
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entries.push(entry);
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}
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skip_read(reader, current, size)?;
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Ok(ElstBox {
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version,
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flags,
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entry_count,
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entries,
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})
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}
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}
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impl<W: Write> WriteBox<&mut BufWriter<W>> for ElstBox {
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fn write_box(&self, writer: &mut BufWriter<W>) -> Result<u64> {
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let size = self.box_size();
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BoxHeader::new(self.box_type(), size).write_box(writer)?;
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write_box_header_ext(writer, self.version, self.flags)?;
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assert_eq!(self.entry_count as usize, self.entries.len());
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writer.write_u32::<BigEndian>(self.entry_count)?;
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for entry in self.entries.iter() {
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if self.version == 1 {
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writer.write_u64::<BigEndian>(entry.segment_duration)?;
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writer.write_u64::<BigEndian>(entry.media_time)?;
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} else {
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writer.write_u32::<BigEndian>(entry.segment_duration as u32)?;
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writer.write_u32::<BigEndian>(entry.media_time as u32)?;
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}
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writer.write_u16::<BigEndian>(entry.media_rate)?;
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writer.write_u16::<BigEndian>(entry.media_rate_fraction)?;
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}
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Ok(size)
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}
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}
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