mirror of
https://github.com/alfg/mp4-rust.git
synced 2024-05-20 01:08:06 +00:00
188 lines
5.3 KiB
Rust
188 lines
5.3 KiB
Rust
use byteorder::{BigEndian, WriteBytesExt};
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use serde::Serialize;
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use std::io::Write;
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use std::mem::size_of;
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use crate::mp4box::*;
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#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize)]
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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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#[serde(skip_serializing)]
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pub entries: Vec<ElstEntry>,
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}
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#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize)]
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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 ElstBox {
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pub fn get_type(&self) -> BoxType {
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BoxType::ElstBox
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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 + 4;
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if self.version == 1 {
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size += self.entries.len() as u64 * 20;
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} else if self.version == 0 {
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size += self.entries.len() 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 Mp4Box for ElstBox {
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const TYPE: BoxType = BoxType::ElstBox;
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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!("elst_entries={}", self.entries.len());
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Ok(s)
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}
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}
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impl BlockReader for ElstBox {
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fn read_block<'a>(reader: &mut impl Reader<'a>) -> Result<Self> {
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let (version, flags) = read_box_header_ext(reader);
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let entry_count = reader.get_u32();
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let entry_size = {
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let mut entry_size = 0;
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entry_size += if version == 1 {
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size_of::<u64>() + size_of::<i64>() // segment_duration + media_time
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} else {
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size_of::<u32>() + size_of::<i32>() // segment_duration + media_time
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};
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entry_size += size_of::<i16>() + size_of::<i16>(); // media_rate_integer + media_rate_fraction
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entry_size
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};
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if entry_count as usize > reader.remaining() / entry_size {
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return Err(Error::InvalidData(
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"elst entry_count indicates more entries than could fit in the box",
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));
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}
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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) = if version == 1 {
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(reader.get_u64(), reader.get_u64())
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} else {
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(reader.get_u32() as u64, reader.get_u32() as u64)
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};
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entries.push(ElstEntry {
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segment_duration,
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media_time,
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media_rate: reader.get_u16(),
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media_rate_fraction: reader.get_u16(),
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});
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}
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Ok(ElstBox {
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version,
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flags,
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entries,
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})
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}
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fn size_hint() -> usize {
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8
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}
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}
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impl<W: Write> WriteBox<&mut W> for ElstBox {
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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, self.version, self.flags)?;
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writer.write_u32::<BigEndian>(self.entries.len() as u32)?;
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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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#[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_elst32() {
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let src_box = ElstBox {
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version: 0,
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flags: 0,
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entries: vec![ElstEntry {
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segment_duration: 634634,
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media_time: 0,
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media_rate: 1,
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media_rate_fraction: 0,
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}],
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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::ElstBox);
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assert_eq!(src_box.box_size(), header.size);
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let dst_box = ElstBox::read_block(&mut reader).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_elst64() {
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let src_box = ElstBox {
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version: 1,
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flags: 0,
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entries: vec![ElstEntry {
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segment_duration: 634634,
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media_time: 0,
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media_rate: 1,
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media_rate_fraction: 0,
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}],
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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::ElstBox);
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assert_eq!(src_box.box_size(), header.size);
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let dst_box = ElstBox::read_block(&mut reader).unwrap();
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assert_eq!(src_box, dst_box);
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}
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}
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