use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
use serde::Serialize;
use std::io::{Read, Seek, Write};
use crate::mp4box::*;
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Default)]
pub struct TfhdBox {
pub version: u8,
pub flags: u32,
pub track_id: u32,
pub base_data_offset: Option<u64>,
pub sample_description_index: Option<u32>,
pub default_sample_duration: Option<u32>,
pub default_sample_size: Option<u32>,
pub default_sample_flags: Option<u32>,
}
impl TfhdBox {
pub const FLAG_BASE_DATA_OFFSET: u32 = 0x01;
pub const FLAG_SAMPLE_DESCRIPTION_INDEX: u32 = 0x02;
pub const FLAG_DEFAULT_SAMPLE_DURATION: u32 = 0x08;
pub const FLAG_DEFAULT_SAMPLE_SIZE: u32 = 0x10;
pub const FLAG_DEFAULT_SAMPLE_FLAGS: u32 = 0x20;
pub fn get_type(&self) -> BoxType {
BoxType::TfhdBox
}
pub fn get_size(&self) -> u64 {
let mut sum = HEADER_SIZE + HEADER_EXT_SIZE + 4;
if TfhdBox::FLAG_BASE_DATA_OFFSET & self.flags > 0 {
sum += 8;
}
if TfhdBox::FLAG_SAMPLE_DESCRIPTION_INDEX & self.flags > 0 {
sum += 4;
}
if TfhdBox::FLAG_DEFAULT_SAMPLE_DURATION & self.flags > 0 {
sum += 4;
}
if TfhdBox::FLAG_DEFAULT_SAMPLE_SIZE & self.flags > 0 {
sum += 4;
}
if TfhdBox::FLAG_DEFAULT_SAMPLE_FLAGS & self.flags > 0 {
sum += 4;
}
sum
}
}
impl Mp4Box for TfhdBox {
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!("track_id={}", self.track_id);
Ok(s)
}
}
impl<R: Read + Seek> ReadBox<&mut R> for TfhdBox {
fn read_box(reader: &mut R, size: u64) -> Result<Self> {
let start = box_start(reader)?;
let (version, flags) = read_box_header_ext(reader)?;
let track_id = reader.read_u32::<BigEndian>()?;
let base_data_offset = if TfhdBox::FLAG_BASE_DATA_OFFSET & flags > 0 {
Some(reader.read_u64::<BigEndian>()?)
} else {
None
};
let sample_description_index = if TfhdBox::FLAG_SAMPLE_DESCRIPTION_INDEX & flags > 0 {
Some(reader.read_u32::<BigEndian>()?)
} else {
None
};
let default_sample_duration = if TfhdBox::FLAG_DEFAULT_SAMPLE_DURATION & flags > 0 {
Some(reader.read_u32::<BigEndian>()?)
} else {
None
};
let default_sample_size = if TfhdBox::FLAG_DEFAULT_SAMPLE_SIZE & flags > 0 {
Some(reader.read_u32::<BigEndian>()?)
} else {
None
};
let default_sample_flags = if TfhdBox::FLAG_DEFAULT_SAMPLE_FLAGS & flags > 0 {
Some(reader.read_u32::<BigEndian>()?)
} else {
None
};
skip_bytes_to(reader, start + size)?;
Ok(TfhdBox {
version,
flags,
track_id,
base_data_offset,
sample_description_index,
default_sample_duration,
default_sample_size,
default_sample_flags,
})
}
}
impl<W: Write> WriteBox<&mut W> for TfhdBox {
fn write_box(&self, writer: &mut W) -> Result<u64> {
let size = self.box_size();
BoxHeader::new(self.box_type(), size).write(writer)?;
write_box_header_ext(writer, self.version, self.flags)?;
writer.write_u32::<BigEndian>(self.track_id)?;
if let Some(base_data_offset) = self.base_data_offset {
writer.write_u64::<BigEndian>(base_data_offset)?;
}
if let Some(sample_description_index) = self.sample_description_index {
writer.write_u32::<BigEndian>(sample_description_index)?;
}
if let Some(default_sample_duration) = self.default_sample_duration {
writer.write_u32::<BigEndian>(default_sample_duration)?;
}
if let Some(default_sample_size) = self.default_sample_size {
writer.write_u32::<BigEndian>(default_sample_size)?;
}
if let Some(default_sample_flags) = self.default_sample_flags {
writer.write_u32::<BigEndian>(default_sample_flags)?;
}
Ok(size)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::mp4box::BoxHeader;
use std::io::Cursor;
#[test]
fn test_tfhd() {
let src_box = TfhdBox {
version: 0,
flags: 0,
track_id: 1,
base_data_offset: None,
sample_description_index: None,
default_sample_duration: None,
default_sample_size: None,
default_sample_flags: None,
};
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::TfhdBox);
assert_eq!(src_box.box_size(), header.size);
let dst_box = TfhdBox::read_box(&mut reader, header.size).unwrap();
assert_eq!(src_box, dst_box);
}
#[test]
fn test_tfhd_with_flags() {
let src_box = TfhdBox {
version: 0,
flags: TfhdBox::FLAG_SAMPLE_DESCRIPTION_INDEX
| TfhdBox::FLAG_DEFAULT_SAMPLE_DURATION
| TfhdBox::FLAG_DEFAULT_SAMPLE_FLAGS,
track_id: 1,
base_data_offset: None,
sample_description_index: Some(1),
default_sample_duration: Some(512),
default_sample_size: None,
default_sample_flags: Some(0x1010000),
};
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::TfhdBox);
assert_eq!(src_box.box_size(), header.size);
let dst_box = TfhdBox::read_box(&mut reader, header.size).unwrap();
assert_eq!(src_box, dst_box);
}
}