mirror of
https://github.com/alfg/mp4-rust.git
synced 2024-05-20 01:08:06 +00:00
219 lines
6.3 KiB
Rust
219 lines
6.3 KiB
Rust
use std::io::Write;
|
|
|
|
use byteorder::{BigEndian, WriteBytesExt};
|
|
use serde::Serialize;
|
|
|
|
use crate::mp4box::*;
|
|
|
|
#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize)]
|
|
pub struct EmsgBox {
|
|
pub version: u8,
|
|
pub flags: u32,
|
|
pub timescale: u32,
|
|
pub presentation_time: Option<u64>,
|
|
pub presentation_time_delta: Option<u32>,
|
|
pub event_duration: u32,
|
|
pub id: u32,
|
|
pub scheme_id_uri: String,
|
|
pub value: String,
|
|
pub message_data: Vec<u8>,
|
|
}
|
|
|
|
impl EmsgBox {
|
|
fn size_without_message(version: u8, scheme_id_uri: &str, value: &str) -> u64 {
|
|
HEADER_SIZE + HEADER_EXT_SIZE +
|
|
4 + // id
|
|
Self::time_size(version) +
|
|
(scheme_id_uri.len() + 1) as u64 +
|
|
(value.len() as u64 + 1)
|
|
}
|
|
|
|
fn time_size(version: u8) -> u64 {
|
|
match version {
|
|
0 => 12,
|
|
1 => 16,
|
|
_ => panic!("version must be 0 or 1"),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Mp4Box for EmsgBox {
|
|
const TYPE: BoxType = BoxType::EmsgBox;
|
|
|
|
fn box_size(&self) -> u64 {
|
|
Self::size_without_message(self.version, &self.scheme_id_uri, &self.value)
|
|
+ self.message_data.len() as u64
|
|
}
|
|
|
|
fn to_json(&self) -> Result<String> {
|
|
Ok(serde_json::to_string(&self).unwrap())
|
|
}
|
|
|
|
fn summary(&self) -> Result<String> {
|
|
let s = format!("id={} value={}", self.id, self.value);
|
|
Ok(s)
|
|
}
|
|
}
|
|
|
|
impl BlockReader for EmsgBox {
|
|
fn read_block<'a>(reader: &mut impl Reader<'a>) -> Result<Self> {
|
|
let (version, flags) = read_box_header_ext(reader);
|
|
|
|
let (
|
|
timescale,
|
|
presentation_time,
|
|
presentation_time_delta,
|
|
event_duration,
|
|
id,
|
|
scheme_id_uri,
|
|
value,
|
|
) = match version {
|
|
0 => {
|
|
let scheme_id_uri = reader.get_null_terminated_string();
|
|
let value = reader.get_null_terminated_string();
|
|
|
|
(
|
|
reader.get_u32(),
|
|
None,
|
|
Some(reader.get_u32()),
|
|
reader.get_u32(),
|
|
reader.get_u32(),
|
|
scheme_id_uri,
|
|
value,
|
|
)
|
|
}
|
|
1 => (
|
|
reader.get_u32(),
|
|
Some(reader.get_u64()),
|
|
None,
|
|
reader.get_u32(),
|
|
reader.get_u32(),
|
|
reader.get_null_terminated_string(),
|
|
reader.get_null_terminated_string(),
|
|
),
|
|
_ => return Err(Error::InvalidData("version must be 0 or 1")),
|
|
};
|
|
|
|
Ok(EmsgBox {
|
|
version,
|
|
flags,
|
|
timescale,
|
|
presentation_time,
|
|
presentation_time_delta,
|
|
event_duration,
|
|
id,
|
|
scheme_id_uri,
|
|
value,
|
|
message_data: reader.collect(reader.remaining())?,
|
|
})
|
|
}
|
|
|
|
fn size_hint() -> usize {
|
|
22
|
|
}
|
|
}
|
|
|
|
impl<W: Write> WriteBox<&mut W> for EmsgBox {
|
|
fn write_box(&self, writer: &mut W) -> Result<u64> {
|
|
let size = self.box_size();
|
|
BoxHeader::new(Self::TYPE, size).write(writer)?;
|
|
|
|
write_box_header_ext(writer, self.version, self.flags)?;
|
|
match self.version {
|
|
0 => {
|
|
write_null_terminated_str(writer, &self.scheme_id_uri)?;
|
|
write_null_terminated_str(writer, &self.value)?;
|
|
writer.write_u32::<BigEndian>(self.timescale)?;
|
|
writer.write_u32::<BigEndian>(self.presentation_time_delta.unwrap())?;
|
|
writer.write_u32::<BigEndian>(self.event_duration)?;
|
|
writer.write_u32::<BigEndian>(self.id)?;
|
|
}
|
|
1 => {
|
|
writer.write_u32::<BigEndian>(self.timescale)?;
|
|
writer.write_u64::<BigEndian>(self.presentation_time.unwrap())?;
|
|
writer.write_u32::<BigEndian>(self.event_duration)?;
|
|
writer.write_u32::<BigEndian>(self.id)?;
|
|
write_null_terminated_str(writer, &self.scheme_id_uri)?;
|
|
write_null_terminated_str(writer, &self.value)?;
|
|
}
|
|
_ => return Err(Error::InvalidData("version must be 0 or 1")),
|
|
}
|
|
|
|
for &byte in &self.message_data {
|
|
writer.write_u8(byte)?;
|
|
}
|
|
|
|
Ok(size)
|
|
}
|
|
}
|
|
|
|
fn write_null_terminated_str<W: Write>(writer: &mut W, string: &str) -> Result<()> {
|
|
for byte in string.bytes() {
|
|
writer.write_u8(byte)?;
|
|
}
|
|
writer.write_u8(0)?;
|
|
Ok(())
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
|
|
use crate::mp4box::BoxHeader;
|
|
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn test_emsg_version0() {
|
|
let src_box = EmsgBox {
|
|
version: 0,
|
|
flags: 0,
|
|
timescale: 48000,
|
|
presentation_time: None,
|
|
presentation_time_delta: Some(100),
|
|
event_duration: 200,
|
|
id: 8,
|
|
scheme_id_uri: String::from("foo"),
|
|
value: String::from("foo"),
|
|
message_data: vec![1, 2, 3],
|
|
};
|
|
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 = buf.as_slice();
|
|
let header = BoxHeader::read_sync(&mut reader).unwrap().unwrap();
|
|
assert_eq!(header.kind, BoxType::EmsgBox);
|
|
assert_eq!(src_box.box_size(), header.size);
|
|
|
|
let dst_box = EmsgBox::read_block(&mut reader).unwrap();
|
|
assert_eq!(src_box, dst_box);
|
|
}
|
|
|
|
#[test]
|
|
fn test_emsg_version1() {
|
|
let src_box = EmsgBox {
|
|
version: 1,
|
|
flags: 0,
|
|
timescale: 48000,
|
|
presentation_time: Some(50000),
|
|
presentation_time_delta: None,
|
|
event_duration: 200,
|
|
id: 8,
|
|
scheme_id_uri: String::from("foo"),
|
|
value: String::from("foo"),
|
|
message_data: vec![3, 2, 1],
|
|
};
|
|
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 = buf.as_slice();
|
|
let header = BoxHeader::read_sync(&mut reader).unwrap().unwrap();
|
|
assert_eq!(header.kind, BoxType::EmsgBox);
|
|
assert_eq!(src_box.box_size(), header.size);
|
|
|
|
let dst_box = EmsgBox::read_block(&mut reader).unwrap();
|
|
assert_eq!(src_box, dst_box);
|
|
}
|
|
}
|