use byteorder::{BigEndian, WriteBytesExt};
use serde::Serialize;
use std::io::Write;
use std::mem::size_of;
use crate::mp4box::*;
#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize)]
pub struct TrunBox {
pub version: u8,
pub flags: u32,
pub sample_count: u32,
pub data_offset: Option<i32>,
pub first_sample_flags: Option<u32>,
#[serde(skip_serializing)]
pub sample_durations: Vec<u32>,
#[serde(skip_serializing)]
pub sample_sizes: Vec<u32>,
#[serde(skip_serializing)]
pub sample_flags: Vec<u32>,
#[serde(skip_serializing)]
pub sample_cts: Vec<u32>,
}
impl TrunBox {
pub const FLAG_DATA_OFFSET: u32 = 0x01;
pub const FLAG_FIRST_SAMPLE_FLAGS: u32 = 0x04;
pub const FLAG_SAMPLE_DURATION: u32 = 0x100;
pub const FLAG_SAMPLE_SIZE: u32 = 0x200;
pub const FLAG_SAMPLE_FLAGS: u32 = 0x400;
pub const FLAG_SAMPLE_CTS: u32 = 0x800;
pub fn get_type(&self) -> BoxType {
BoxType::TrunBox
}
pub fn get_size(&self) -> u64 {
let mut sum = HEADER_SIZE + HEADER_EXT_SIZE + 4;
if TrunBox::FLAG_DATA_OFFSET & self.flags > 0 {
sum += 4;
}
if TrunBox::FLAG_FIRST_SAMPLE_FLAGS & self.flags > 0 {
sum += 4;
}
if TrunBox::FLAG_SAMPLE_DURATION & self.flags > 0 {
sum += 4 * self.sample_count as u64;
}
if TrunBox::FLAG_SAMPLE_SIZE & self.flags > 0 {
sum += 4 * self.sample_count as u64;
}
if TrunBox::FLAG_SAMPLE_FLAGS & self.flags > 0 {
sum += 4 * self.sample_count as u64;
}
if TrunBox::FLAG_SAMPLE_CTS & self.flags > 0 {
sum += 4 * self.sample_count as u64;
}
sum
}
}
impl Mp4Box for TrunBox {
const TYPE: BoxType = BoxType::TrunBox;
fn box_size(&self) -> u64 {
self.get_size()
}
fn to_json(&self) -> Result<String, Error> {
Ok(serde_json::to_string(&self).unwrap())
}
fn summary(&self) -> Result<String, Error> {
let s = format!("sample_size={}", self.sample_count);
Ok(s)
}
}
impl BlockReader for TrunBox {
fn read_block<'a>(reader: &mut impl Reader<'a>) -> Result<Self, Error> {
let (version, flags) = read_box_header_ext(reader);
let sample_size = if TrunBox::FLAG_SAMPLE_DURATION & flags > 0 { size_of::<u32>() } else { 0 } + if TrunBox::FLAG_SAMPLE_SIZE & flags > 0 { size_of::<u32>() } else { 0 } + if TrunBox::FLAG_SAMPLE_FLAGS & flags > 0 { size_of::<u32>() } else { 0 } + if TrunBox::FLAG_SAMPLE_CTS & flags > 0 { size_of::<u32>() } else { 0 };
let sample_count = reader.get_u32();
let data_offset = if TrunBox::FLAG_DATA_OFFSET & flags > 0 {
Some(reader.try_get_i32()?)
} else {
None
};
let first_sample_flags = if TrunBox::FLAG_FIRST_SAMPLE_FLAGS & flags > 0 {
Some(reader.try_get_u32()?)
} else {
None
};
let mut sample_durations = Vec::new();
let mut sample_sizes = Vec::new();
let mut sample_flags = Vec::new();
let mut sample_cts = Vec::new();
if sample_count as usize * sample_size > reader.remaining() {
return Err(Error::InvalidData(
"trun sample_count indicates more values than could fit in the box",
));
}
if TrunBox::FLAG_SAMPLE_DURATION & flags > 0 {
sample_durations.reserve(sample_count as usize);
}
if TrunBox::FLAG_SAMPLE_SIZE & flags > 0 {
sample_sizes.reserve(sample_count as usize);
}
if TrunBox::FLAG_SAMPLE_FLAGS & flags > 0 {
sample_flags.reserve(sample_count as usize);
}
if TrunBox::FLAG_SAMPLE_CTS & flags > 0 {
sample_cts.reserve(sample_count as usize);
}
for _ in 0..sample_count {
if TrunBox::FLAG_SAMPLE_DURATION & flags > 0 {
let duration = reader.get_u32();
sample_durations.push(duration);
}
if TrunBox::FLAG_SAMPLE_SIZE & flags > 0 {
let sample_size = reader.get_u32();
sample_sizes.push(sample_size);
}
if TrunBox::FLAG_SAMPLE_FLAGS & flags > 0 {
let sample_flag = reader.get_u32();
sample_flags.push(sample_flag);
}
if TrunBox::FLAG_SAMPLE_CTS & flags > 0 {
let cts = reader.get_u32();
sample_cts.push(cts);
}
}
Ok(TrunBox {
version,
flags,
sample_count,
data_offset,
first_sample_flags,
sample_durations,
sample_sizes,
sample_flags,
sample_cts,
})
}
fn size_hint() -> usize {
8
}
}
impl<W: Write> WriteBox<&mut W> for TrunBox {
fn write_box(&self, writer: &mut W) -> Result<u64, Error> {
let size = self.box_size();
BoxHeader::new(Self::TYPE, size).write(writer)?;
write_box_header_ext(writer, self.version, self.flags)?;
writer.write_u32::<BigEndian>(self.sample_count)?;
if let Some(v) = self.data_offset {
writer.write_i32::<BigEndian>(v)?;
}
if let Some(v) = self.first_sample_flags {
writer.write_u32::<BigEndian>(v)?;
}
if self.sample_count != self.sample_sizes.len() as u32 {
return Err(Error::InvalidData("sample count out of sync"));
}
for i in 0..self.sample_count as usize {
if TrunBox::FLAG_SAMPLE_DURATION & self.flags > 0 {
writer.write_u32::<BigEndian>(self.sample_durations[i])?;
}
if TrunBox::FLAG_SAMPLE_SIZE & self.flags > 0 {
writer.write_u32::<BigEndian>(self.sample_sizes[i])?;
}
if TrunBox::FLAG_SAMPLE_FLAGS & self.flags > 0 {
writer.write_u32::<BigEndian>(self.sample_flags[i])?;
}
if TrunBox::FLAG_SAMPLE_CTS & self.flags > 0 {
writer.write_u32::<BigEndian>(self.sample_cts[i])?;
}
}
Ok(size)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::mp4box::BoxHeader;
#[tokio::test]
async fn test_trun_same_size() {
let src_box = TrunBox {
version: 0,
flags: 0,
data_offset: None,
sample_count: 0,
sample_sizes: vec![],
sample_flags: vec![],
first_sample_flags: None,
sample_durations: vec![],
sample_cts: vec![],
};
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(&mut reader, &mut 0).await.unwrap().unwrap();
assert_eq!(header.kind, BoxType::TrunBox);
assert_eq!(src_box.box_size(), header.size);
let dst_box = TrunBox::read_block(&mut reader).unwrap();
assert_eq!(src_box, dst_box);
}
#[tokio::test]
async fn test_trun_many_sizes() {
let src_box = TrunBox {
version: 0,
flags: TrunBox::FLAG_SAMPLE_DURATION
| TrunBox::FLAG_SAMPLE_SIZE
| TrunBox::FLAG_SAMPLE_FLAGS
| TrunBox::FLAG_SAMPLE_CTS,
data_offset: None,
sample_count: 9,
sample_sizes: vec![1165, 11, 11, 8545, 10126, 10866, 9643, 9351, 7730],
sample_flags: vec![1165, 11, 11, 8545, 10126, 10866, 9643, 9351, 7730],
first_sample_flags: None,
sample_durations: vec![1165, 11, 11, 8545, 10126, 10866, 9643, 9351, 7730],
sample_cts: vec![1165, 11, 11, 8545, 10126, 10866, 9643, 9351, 7730],
};
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(&mut reader, &mut 0).await.unwrap().unwrap();
assert_eq!(header.kind, BoxType::TrunBox);
assert_eq!(src_box.box_size(), header.size);
let dst_box = TrunBox::read_block(&mut reader).unwrap();
assert_eq!(src_box, dst_box);
}
}