mirror of
https://github.com/alfg/mp4-rust.git
synced 2024-06-11 09:29:21 +00:00
132 lines
3.5 KiB
Rust
132 lines
3.5 KiB
Rust
use serde::Serialize;
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use std::io::{Read, Seek, Write};
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use crate::mp4box::*;
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const RESERVED_DATA_SIZE: u64 = 28;
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#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize)]
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pub struct EncaBox {
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#[serde(skip_serializing_if = "Option::is_none")]
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pub mp4a: Option<Mp4aBox>,
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pub sinf: SinfBox,
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}
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impl EncaBox {
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pub fn get_type(&self) -> BoxType {
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BoxType::EncaBox
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}
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pub fn get_size(&self) -> u64 {
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let mut size = 0;
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if let Some(ref mp4a) = self.mp4a {
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// HEADER_SIZE intentionally omitted
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size += mp4a.box_size();
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} else {
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size += HEADER_SIZE + RESERVED_DATA_SIZE;
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}
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size += self.sinf.box_size();
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size
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}
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}
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impl Mp4Box for EncaBox {
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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 child_summary = if let Some(ref mp4a) = self.mp4a {
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mp4a.summary()
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} else {
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Err(Error::InvalidData(""))
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};
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let mut s = format!("original_format={}", &self.sinf.frma.original_format);
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if let Ok(summary) = child_summary {
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s.push(' ');
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s.push_str(&summary);
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}
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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 EncaBox {
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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 mut mp4a = None;
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let mut sinf = None;
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// skip current container items
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skip_bytes(reader, RESERVED_DATA_SIZE)?;
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let mut current = reader.stream_position()?;
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let end = start + size;
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while current < end {
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// Get box header.
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let header = BoxHeader::read(reader)?;
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let BoxHeader { name, size: s } = header;
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if s > size {
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return Err(Error::InvalidData(
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"enca box contains a box with a larger size than it",
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));
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}
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match name {
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BoxType::SinfBox => {
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sinf = Some(SinfBox::read_box(reader, s)?);
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break;
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}
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_ => {
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skip_box(reader, s)?;
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}
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}
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current = reader.stream_position()?;
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}
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let sinf = sinf.ok_or(Error::BoxNotFound(BoxType::SinfBox))?;
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reader.seek(SeekFrom::Start(start + HEADER_SIZE))?;
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let original_format: BoxType = sinf.frma.original_format.into();
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if original_format == BoxType::Mp4aBox {
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mp4a = Some(Mp4aBox::read_box(reader, size)?);
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}
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skip_bytes_to(reader, start + size)?;
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Ok(EncaBox { mp4a, sinf })
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}
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}
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impl<W: Write> WriteBox<&mut W> for EncaBox {
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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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if let Some(ref mp4a) = self.mp4a {
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// the enca box header is used, so the header from this box
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// must be removed
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let mut buf = Vec::with_capacity(mp4a.box_size() as usize);
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mp4a.write_box(&mut buf)?;
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writer.write_all(&buf[HEADER_SIZE as usize..])?;
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} else {
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writer.write_all(&[0; RESERVED_DATA_SIZE as usize])?;
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}
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self.sinf.write_box(writer)?;
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Ok(size)
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}
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}
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