mirror of
https://github.com/alfg/mp4-rust.git
synced 2024-05-20 01:08:06 +00:00
161 lines
4.4 KiB
Rust
161 lines
4.4 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 StszBox {
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pub version: u8,
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pub flags: u32,
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pub sample_size: u32,
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pub sample_count: u32,
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#[serde(skip_serializing)]
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pub sample_sizes: Vec<u32>,
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}
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impl StszBox {
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pub fn get_type(&self) -> BoxType {
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BoxType::StszBox
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}
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pub fn get_size(&self) -> u64 {
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HEADER_SIZE + HEADER_EXT_SIZE + 8 + (4 * self.sample_sizes.len() as u64)
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}
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}
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impl Mp4Box for StszBox {
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const TYPE: BoxType = BoxType::StszBox;
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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!(
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"sample_size={} sample_count={} sample_sizes={}",
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self.sample_size,
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self.sample_count,
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self.sample_sizes.len()
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);
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Ok(s)
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}
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}
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impl BlockReader for StszBox {
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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 sample_size = reader.get_u32();
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let stsz_item_size = if sample_size == 0 {
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size_of::<u32>() // entry_size
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} else {
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0
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};
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let sample_count = reader.get_u32();
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let mut sample_sizes = Vec::new();
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if sample_size == 0 {
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if sample_count as usize > reader.remaining() / stsz_item_size {
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return Err(Error::InvalidData(
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"stsz sample_count indicates more values than could fit in the box",
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));
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}
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sample_sizes.reserve(sample_count as usize);
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for _ in 0..sample_count {
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let sample_number = reader.get_u32();
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sample_sizes.push(sample_number);
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}
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}
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Ok(StszBox {
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version,
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flags,
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sample_size,
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sample_count,
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sample_sizes,
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})
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}
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fn size_hint() -> usize {
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12
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}
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}
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impl<W: Write> WriteBox<&mut W> for StszBox {
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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.sample_size)?;
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writer.write_u32::<BigEndian>(self.sample_count)?;
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if self.sample_size == 0 {
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if self.sample_count != self.sample_sizes.len() as u32 {
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return Err(Error::InvalidData("sample count out of sync"));
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}
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for sample_number in self.sample_sizes.iter() {
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writer.write_u32::<BigEndian>(*sample_number)?;
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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_stsz_same_size() {
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let src_box = StszBox {
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version: 0,
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flags: 0,
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sample_size: 1165,
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sample_count: 12,
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sample_sizes: vec![],
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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::StszBox);
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assert_eq!(src_box.box_size(), header.size);
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let dst_box = StszBox::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_stsz_many_sizes() {
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let src_box = StszBox {
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version: 0,
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flags: 0,
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sample_size: 0,
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sample_count: 9,
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sample_sizes: vec![1165, 11, 11, 8545, 10126, 10866, 9643, 9351, 7730],
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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::StszBox);
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assert_eq!(src_box.box_size(), header.size);
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let dst_box = StszBox::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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