mirror of
https://github.com/alfg/mp4-rust.git
synced 2024-05-20 01:08:06 +00:00
192 lines
5.2 KiB
Rust
192 lines
5.2 KiB
Rust
use std::borrow::Cow;
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use std::collections::HashMap;
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use byteorder::ByteOrder;
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use serde::Serialize;
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use crate::mp4box::data::DataBox;
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use crate::mp4box::*;
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#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize)]
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pub struct IlstBox {
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pub items: HashMap<MetadataKey, DataBox>,
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}
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impl IlstBox {
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pub fn get_type(&self) -> BoxType {
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BoxType::IlstBox
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}
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pub fn get_size(&self) -> u64 {
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let mut size = HEADER_SIZE;
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for item in self.items.values() {
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size += item.get_size();
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}
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size
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}
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}
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impl Mp4Box for IlstBox {
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const TYPE: BoxType = BoxType::IlstBox;
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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!("item_count={}", self.items.len());
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Ok(s)
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}
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}
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impl BlockReader for IlstBox {
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fn read_block<'a>(reader: &mut impl Reader<'a>) -> Result<Self> {
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let mut items = HashMap::new();
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while let Some(mut bx) = reader.get_box()? {
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match bx.kind {
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BoxType::NameBox => {
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if let Some(title) = bx.inner.try_find_box::<DataBox>()? {
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items.insert(MetadataKey::Title, title);
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}
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}
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BoxType::DayBox => {
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if let Some(day) = bx.inner.try_find_box::<DataBox>()? {
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items.insert(MetadataKey::Year, day);
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}
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}
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BoxType::CovrBox => {
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if let Some(cover) = bx.inner.try_find_box::<DataBox>()? {
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items.insert(MetadataKey::Poster, cover);
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}
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}
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BoxType::DescBox => {
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if let Some(summary) = bx.inner.try_find_box::<DataBox>()? {
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items.insert(MetadataKey::Summary, summary);
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}
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}
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_ => continue,
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}
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}
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Ok(IlstBox { items })
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}
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fn size_hint() -> usize {
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0
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}
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}
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impl<W: Write> WriteBox<&mut W> for IlstBox {
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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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for (key, value) in &self.items {
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let name = match key {
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MetadataKey::Title => BoxType::NameBox,
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MetadataKey::Year => BoxType::DayBox,
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MetadataKey::Poster => BoxType::CovrBox,
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MetadataKey::Summary => BoxType::DescBox,
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};
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BoxHeader::new(name, value.get_size()).write(writer)?;
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value.write_box(writer)?;
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}
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Ok(size)
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}
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}
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impl<'a> Metadata<'a> for IlstBox {
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fn title(&self) -> Option<Cow<str>> {
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self.items.get(&MetadataKey::Title).map(item_to_str)
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}
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fn year(&self) -> Option<u32> {
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self.items.get(&MetadataKey::Year).and_then(item_to_u32)
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}
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fn poster(&self) -> Option<&[u8]> {
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self.items.get(&MetadataKey::Poster).map(item_to_bytes)
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}
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fn summary(&self) -> Option<Cow<str>> {
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self.items.get(&MetadataKey::Summary).map(item_to_str)
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}
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}
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fn item_to_bytes(item: &DataBox) -> &[u8] {
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&item.data
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}
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fn item_to_str(item: &DataBox) -> Cow<str> {
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String::from_utf8_lossy(&item.data)
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}
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fn item_to_u32(item: &DataBox) -> Option<u32> {
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match item.data_type {
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DataType::Binary if item.data.len() == 4 => Some(BigEndian::read_u32(&item.data)),
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DataType::Text => String::from_utf8_lossy(&item.data).parse::<u32>().ok(),
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_ => None,
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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_ilst() {
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let src_year = DataBox {
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data_type: DataType::Text,
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data: b"test_year".to_vec(),
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};
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let src_box = IlstBox {
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items: [
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(MetadataKey::Title, DataBox::default()),
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(MetadataKey::Year, src_year),
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(MetadataKey::Poster, DataBox::default()),
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(MetadataKey::Summary, DataBox::default()),
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]
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.into(),
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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::IlstBox);
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assert_eq!(src_box.box_size(), header.size);
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let dst_box = IlstBox::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_ilst_empty() {
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let src_box = IlstBox::default();
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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::IlstBox);
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assert_eq!(src_box.box_size(), header.size);
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let dst_box = IlstBox::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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