mirror of
https://github.com/alfg/mp4-rust.git
synced 2024-05-20 01:08:06 +00:00
268 lines
8.3 KiB
Rust
268 lines
8.3 KiB
Rust
use byteorder::{BigEndian, WriteBytesExt};
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use serde::Serialize;
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use std::io::Write;
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use std::mem::size_of;
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use crate::mp4box::*;
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#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize)]
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pub struct TrunBox {
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pub version: u8,
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pub flags: u32,
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pub sample_count: u32,
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pub data_offset: Option<i32>,
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pub first_sample_flags: Option<u32>,
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#[serde(skip_serializing)]
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pub sample_durations: Vec<u32>,
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#[serde(skip_serializing)]
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pub sample_sizes: Vec<u32>,
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#[serde(skip_serializing)]
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pub sample_flags: Vec<u32>,
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#[serde(skip_serializing)]
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pub sample_cts: Vec<u32>,
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}
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impl TrunBox {
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pub const FLAG_DATA_OFFSET: u32 = 0x01;
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pub const FLAG_FIRST_SAMPLE_FLAGS: u32 = 0x04;
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pub const FLAG_SAMPLE_DURATION: u32 = 0x100;
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pub const FLAG_SAMPLE_SIZE: u32 = 0x200;
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pub const FLAG_SAMPLE_FLAGS: u32 = 0x400;
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pub const FLAG_SAMPLE_CTS: u32 = 0x800;
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pub fn get_type(&self) -> BoxType {
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BoxType::TrunBox
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}
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pub fn get_size(&self) -> u64 {
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let mut sum = HEADER_SIZE + HEADER_EXT_SIZE + 4;
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if TrunBox::FLAG_DATA_OFFSET & self.flags > 0 {
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sum += 4;
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}
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if TrunBox::FLAG_FIRST_SAMPLE_FLAGS & self.flags > 0 {
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sum += 4;
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}
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if TrunBox::FLAG_SAMPLE_DURATION & self.flags > 0 {
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sum += 4 * self.sample_count as u64;
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}
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if TrunBox::FLAG_SAMPLE_SIZE & self.flags > 0 {
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sum += 4 * self.sample_count as u64;
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}
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if TrunBox::FLAG_SAMPLE_FLAGS & self.flags > 0 {
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sum += 4 * self.sample_count as u64;
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}
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if TrunBox::FLAG_SAMPLE_CTS & self.flags > 0 {
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sum += 4 * self.sample_count as u64;
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}
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sum
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}
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}
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impl Mp4Box for TrunBox {
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const TYPE: BoxType = BoxType::TrunBox;
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fn box_size(&self) -> u64 {
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self.get_size()
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}
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fn to_json(&self) -> Result<String> {
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Ok(serde_json::to_string(&self).unwrap())
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}
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fn summary(&self) -> Result<String> {
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let s = format!("sample_size={}", self.sample_count);
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Ok(s)
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}
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}
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impl BlockReader for TrunBox {
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fn read_block<'a>(reader: &mut impl Reader<'a>) -> Result<Self> {
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let (version, flags) = read_box_header_ext(reader);
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let sample_size = if TrunBox::FLAG_SAMPLE_DURATION & flags > 0 { size_of::<u32>() } else { 0 } // sample_duration
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+ if TrunBox::FLAG_SAMPLE_SIZE & flags > 0 { size_of::<u32>() } else { 0 } // sample_size
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+ if TrunBox::FLAG_SAMPLE_FLAGS & flags > 0 { size_of::<u32>() } else { 0 } // sample_flags
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+ if TrunBox::FLAG_SAMPLE_CTS & flags > 0 { size_of::<u32>() } else { 0 }; // sample_composition_time_offset
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let sample_count = reader.get_u32();
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let data_offset = if TrunBox::FLAG_DATA_OFFSET & flags > 0 {
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Some(reader.try_get_i32()?)
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} else {
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None
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};
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let first_sample_flags = if TrunBox::FLAG_FIRST_SAMPLE_FLAGS & flags > 0 {
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Some(reader.try_get_u32()?)
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} else {
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None
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};
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let mut sample_durations = Vec::new();
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let mut sample_sizes = Vec::new();
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let mut sample_flags = Vec::new();
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let mut sample_cts = Vec::new();
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if sample_count as usize * sample_size > reader.remaining() {
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return Err(Error::InvalidData(
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"trun sample_count indicates more values than could fit in the box",
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));
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}
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if TrunBox::FLAG_SAMPLE_DURATION & flags > 0 {
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sample_durations.reserve(sample_count as usize);
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}
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if TrunBox::FLAG_SAMPLE_SIZE & flags > 0 {
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sample_sizes.reserve(sample_count as usize);
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}
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if TrunBox::FLAG_SAMPLE_FLAGS & flags > 0 {
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sample_flags.reserve(sample_count as usize);
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}
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if TrunBox::FLAG_SAMPLE_CTS & flags > 0 {
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sample_cts.reserve(sample_count as usize);
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}
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for _ in 0..sample_count {
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if TrunBox::FLAG_SAMPLE_DURATION & flags > 0 {
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let duration = reader.get_u32();
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sample_durations.push(duration);
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}
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if TrunBox::FLAG_SAMPLE_SIZE & flags > 0 {
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let sample_size = reader.get_u32();
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sample_sizes.push(sample_size);
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}
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if TrunBox::FLAG_SAMPLE_FLAGS & flags > 0 {
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let sample_flag = reader.get_u32();
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sample_flags.push(sample_flag);
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}
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if TrunBox::FLAG_SAMPLE_CTS & flags > 0 {
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let cts = reader.get_u32();
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sample_cts.push(cts);
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}
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}
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Ok(TrunBox {
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version,
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flags,
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sample_count,
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data_offset,
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first_sample_flags,
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sample_durations,
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sample_sizes,
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sample_flags,
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sample_cts,
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})
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}
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fn size_hint() -> usize {
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8
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}
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}
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impl<W: Write> WriteBox<&mut W> for TrunBox {
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fn write_box(&self, writer: &mut W) -> Result<u64> {
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let size = self.box_size();
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BoxHeader::new(Self::TYPE, size).write(writer)?;
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write_box_header_ext(writer, self.version, self.flags)?;
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writer.write_u32::<BigEndian>(self.sample_count)?;
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if let Some(v) = self.data_offset {
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writer.write_i32::<BigEndian>(v)?;
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}
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if let Some(v) = self.first_sample_flags {
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writer.write_u32::<BigEndian>(v)?;
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}
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if self.sample_count != self.sample_sizes.len() as u32 {
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return Err(Error::InvalidData("sample count out of sync"));
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}
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for i in 0..self.sample_count as usize {
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if TrunBox::FLAG_SAMPLE_DURATION & self.flags > 0 {
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writer.write_u32::<BigEndian>(self.sample_durations[i])?;
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}
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if TrunBox::FLAG_SAMPLE_SIZE & self.flags > 0 {
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writer.write_u32::<BigEndian>(self.sample_sizes[i])?;
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}
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if TrunBox::FLAG_SAMPLE_FLAGS & self.flags > 0 {
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writer.write_u32::<BigEndian>(self.sample_flags[i])?;
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}
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if TrunBox::FLAG_SAMPLE_CTS & self.flags > 0 {
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writer.write_u32::<BigEndian>(self.sample_cts[i])?;
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}
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}
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Ok(size)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::mp4box::BoxHeader;
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#[test]
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fn test_trun_same_size() {
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let src_box = TrunBox {
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version: 0,
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flags: 0,
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data_offset: None,
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sample_count: 0,
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sample_sizes: vec![],
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sample_flags: vec![],
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first_sample_flags: None,
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sample_durations: vec![],
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sample_cts: vec![],
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};
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let mut buf = Vec::new();
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src_box.write_box(&mut buf).unwrap();
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assert_eq!(buf.len(), src_box.box_size() as usize);
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let mut reader = buf.as_slice();
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let header = BoxHeader::read_sync(&mut reader).unwrap().unwrap();
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assert_eq!(header.kind, BoxType::TrunBox);
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assert_eq!(src_box.box_size(), header.size);
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let dst_box = TrunBox::read_block(&mut reader).unwrap();
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assert_eq!(src_box, dst_box);
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}
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#[test]
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fn test_trun_many_sizes() {
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let src_box = TrunBox {
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version: 0,
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flags: TrunBox::FLAG_SAMPLE_DURATION
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| TrunBox::FLAG_SAMPLE_SIZE
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| TrunBox::FLAG_SAMPLE_FLAGS
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| TrunBox::FLAG_SAMPLE_CTS,
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data_offset: None,
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sample_count: 9,
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sample_sizes: vec![1165, 11, 11, 8545, 10126, 10866, 9643, 9351, 7730],
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sample_flags: vec![1165, 11, 11, 8545, 10126, 10866, 9643, 9351, 7730],
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first_sample_flags: None,
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sample_durations: vec![1165, 11, 11, 8545, 10126, 10866, 9643, 9351, 7730],
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sample_cts: vec![1165, 11, 11, 8545, 10126, 10866, 9643, 9351, 7730],
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};
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let mut buf = Vec::new();
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src_box.write_box(&mut buf).unwrap();
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assert_eq!(buf.len(), src_box.box_size() as usize);
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let mut reader = buf.as_slice();
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let header = BoxHeader::read_sync(&mut reader).unwrap().unwrap();
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assert_eq!(header.kind, BoxType::TrunBox);
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assert_eq!(src_box.box_size(), header.size);
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let dst_box = TrunBox::read_block(&mut reader).unwrap();
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assert_eq!(src_box, dst_box);
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}
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}
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