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|
use byteorder::{BigEndian, WriteBytesExt};
use four_cc::FourCC;
use bytes::{BufMut, BytesMut};
use crate::{FullBoxHeader, Mp4Box, Mp4BoxError};
use std::mem::size_of;
bitflags::bitflags! {
pub struct TrackFragmentHeaderFlags: u32 {
const BASE_DATA_OFFSET_PRESENT = 0x000001;
const SAMPLE_DESCRIPTION_INDEX_PRESENT = 0x000002;
const DEFAULT_SAMPLE_DURATION_PRESENT = 0x000008;
const DEFAULT_SAMPLE_SIZE_PRESENT = 0x000010;
const DEFAULT_SAMPLE_FLAGS_PRESENT = 0x000020;
const DURATION_IS_EMPTY = 0x010000;
const DEFAULT_BASE_IS_MOOF = 0x020000;
}
}
pub struct TrackFragmentHeaderBox {
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>,
pub duration_is_empty: bool,
pub default_base_is_moof: bool,
}
impl TrackFragmentHeaderBox {
fn flags_from_fields(&self) -> TrackFragmentHeaderFlags {
let mut flags = TrackFragmentHeaderFlags::empty();
if self.base_data_offset.is_some() {
flags.insert(TrackFragmentHeaderFlags::BASE_DATA_OFFSET_PRESENT);
}
if self.sample_description_index.is_some() {
flags.insert(TrackFragmentHeaderFlags::SAMPLE_DESCRIPTION_INDEX_PRESENT);
}
if self.default_sample_duration.is_some() {
flags.insert(TrackFragmentHeaderFlags::DEFAULT_SAMPLE_DURATION_PRESENT);
}
if self.default_sample_size.is_some() {
flags.insert(TrackFragmentHeaderFlags::DEFAULT_SAMPLE_SIZE_PRESENT);
}
if self.default_sample_flags.is_some() {
flags.insert(TrackFragmentHeaderFlags::DEFAULT_SAMPLE_FLAGS_PRESENT);
}
if self.duration_is_empty {
flags.insert(TrackFragmentHeaderFlags::DURATION_IS_EMPTY);
}
if self.default_base_is_moof {
flags.insert(TrackFragmentHeaderFlags::DEFAULT_BASE_IS_MOOF);
}
flags
}
}
impl Mp4Box for TrackFragmentHeaderBox {
const NAME: FourCC = FourCC(*b"tfhd");
fn get_full_box_header(&self) -> Option<FullBoxHeader> {
Some(FullBoxHeader::new(0, self.flags_from_fields().bits()))
}
fn content_size(&self) -> u64 {
let mut size = size_of::<u32>() as u64; // track_ID
if self.base_data_offset.is_some() {
size += size_of::<u64>() as u64;
}
if self.sample_description_index.is_some() {
size += size_of::<u32>() as u64;
}
if self.default_sample_duration.is_some() {
size += size_of::<u32>() as u64;
}
if self.default_sample_size.is_some() {
size += size_of::<u32>() as u64;
}
if self.default_sample_flags.is_some() {
size += size_of::<u32>() as u64;
}
size
}
fn write_box_contents(&self, writer: &mut BytesMut) -> Result<(), Mp4BoxError> {
let mut v = Vec::new();
v.write_u32::<BigEndian>(self.track_id)?;
if let Some(base_data_offset) = self.base_data_offset {
v.write_u64::<BigEndian>(base_data_offset)?;
}
if let Some(sample_description_index) = self.sample_description_index {
v.write_u32::<BigEndian>(sample_description_index)?;
}
if let Some(default_sample_duration) = self.default_sample_duration {
v.write_u32::<BigEndian>(default_sample_duration)?;
}
if let Some(default_sample_size) = self.default_sample_size {
v.write_u32::<BigEndian>(default_sample_size)?;
}
if let Some(default_sample_flags) = self.default_sample_flags {
v.write_u32::<BigEndian>(default_sample_flags)?;
}
writer.put_slice(&v);
Ok(())
}
}
|
