use serde::Serialize;
use std::io::{Read, Seek, Write};
use crate::meta::MetaBox;
use crate::mp4box::*;
use crate::mp4box::{mvex::MvexBox, mvhd::MvhdBox, trak::TrakBox, udta::UdtaBox};
#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize)]
pub struct MoovBox {
pub mvhd: MvhdBox,
#[serde(skip_serializing_if = "Option::is_none")]
pub meta: Option<MetaBox>,
#[serde(skip_serializing_if = "Option::is_none")]
pub mvex: Option<MvexBox>,
#[serde(rename = "trak")]
pub traks: Vec<TrakBox>,
#[serde(skip_serializing_if = "Option::is_none")]
pub udta: Option<UdtaBox>,
}
impl MoovBox {
pub fn get_type(&self) -> BoxType {
BoxType::MoovBox
}
pub fn get_size(&self) -> u64 {
let mut size = HEADER_SIZE + self.mvhd.box_size();
for trak in self.traks.iter() {
size += trak.box_size();
}
if let Some(meta) = &self.meta {
size += meta.box_size();
}
if let Some(udta) = &self.udta {
size += udta.box_size();
}
size
}
}
impl Mp4Box for MoovBox {
fn box_type(&self) -> BoxType {
self.get_type()
}
fn box_size(&self) -> u64 {
self.get_size()
}
fn to_json(&self) -> Result<String> {
Ok(serde_json::to_string(&self).unwrap())
}
fn summary(&self) -> Result<String> {
let s = format!("traks={}", self.traks.len());
Ok(s)
}
}
impl<R: Read + Seek> ReadBox<&mut R> for MoovBox {
fn read_box(reader: &mut R, size: u64) -> Result<Self> {
let start = box_start(reader)?;
let mut mvhd = None;
let mut meta = None;
let mut udta = None;
let mut mvex = None;
let mut traks = Vec::new();
let mut current = reader.stream_position()?;
let end = start + size;
while current < end {
let header = BoxHeader::read(reader)?;
let BoxHeader { name, size: s } = header;
if s > size {
return Err(Error::InvalidData(
"moov box contains a box with a larger size than it",
));
}
match name {
BoxType::MvhdBox => {
mvhd = Some(MvhdBox::read_box(reader, s)?);
}
BoxType::MetaBox => {
meta = Some(MetaBox::read_box(reader, s)?);
}
BoxType::MvexBox => {
mvex = Some(MvexBox::read_box(reader, s)?);
}
BoxType::TrakBox => {
let trak = TrakBox::read_box(reader, s)?;
traks.push(trak);
}
BoxType::UdtaBox => {
udta = Some(UdtaBox::read_box(reader, s)?);
}
_ => {
skip_box(reader, s)?;
}
}
current = reader.stream_position()?;
}
if mvhd.is_none() {
return Err(Error::BoxNotFound(BoxType::MvhdBox));
}
skip_bytes_to(reader, start + size)?;
Ok(MoovBox {
mvhd: mvhd.unwrap(),
meta,
udta,
mvex,
traks,
})
}
}
impl<W: Write> WriteBox<&mut W> for MoovBox {
fn write_box(&self, writer: &mut W) -> Result<u64> {
let size = self.box_size();
BoxHeader::new(self.box_type(), size).write(writer)?;
self.mvhd.write_box(writer)?;
for trak in self.traks.iter() {
trak.write_box(writer)?;
}
if let Some(meta) = &self.meta {
meta.write_box(writer)?;
}
if let Some(udta) = &self.udta {
udta.write_box(writer)?;
}
Ok(0)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::mp4box::BoxHeader;
use std::io::Cursor;
#[test]
fn test_moov() {
let src_box = MoovBox {
mvhd: MvhdBox::default(),
mvex: None, traks: vec![],
meta: Some(MetaBox::default()),
udta: Some(UdtaBox::default()),
};
let mut buf = Vec::new();
src_box.write_box(&mut buf).unwrap();
assert_eq!(buf.len(), src_box.box_size() as usize);
let mut reader = Cursor::new(&buf);
let header = BoxHeader::read(&mut reader).unwrap();
assert_eq!(header.name, BoxType::MoovBox);
assert_eq!(header.size, src_box.box_size());
let dst_box = MoovBox::read_box(&mut reader, header.size).unwrap();
assert_eq!(dst_box, src_box);
}
#[test]
fn test_moov_empty() {
let src_box = MoovBox::default();
let mut buf = Vec::new();
src_box.write_box(&mut buf).unwrap();
assert_eq!(buf.len(), src_box.box_size() as usize);
let mut reader = Cursor::new(&buf);
let header = BoxHeader::read(&mut reader).unwrap();
assert_eq!(header.name, BoxType::MoovBox);
assert_eq!(header.size, src_box.box_size());
let dst_box = MoovBox::read_box(&mut reader, header.size).unwrap();
assert_eq!(dst_box, src_box);
}
}