flowly_mp4/mp4box/
vpcc.rs

1use crate::mp4box::*;
2use crate::Mp4Box;
3use serde::Serialize;
4
5#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize)]
6pub struct VpccBox {
7    pub version: u8,
8    pub flags: u32,
9    pub profile: u8,
10    pub level: u8,
11    pub bit_depth: u8,
12    pub chroma_subsampling: u8,
13    pub video_full_range_flag: bool,
14    pub color_primaries: u8,
15    pub transfer_characteristics: u8,
16    pub matrix_coefficients: u8,
17    pub codec_initialization_data_size: u16,
18}
19
20impl VpccBox {
21    pub const DEFAULT_VERSION: u8 = 1;
22    pub const DEFAULT_BIT_DEPTH: u8 = 8;
23}
24
25impl Mp4Box for VpccBox {
26    const TYPE: BoxType = BoxType::VpccBox;
27
28    fn box_size(&self) -> u64 {
29        HEADER_SIZE + HEADER_EXT_SIZE + 8
30    }
31
32    fn to_json(&self) -> Result<String, Error> {
33        Ok(serde_json::to_string(&self).unwrap())
34    }
35
36    fn summary(&self) -> Result<String, Error> {
37        Ok(format!("{self:?}"))
38    }
39}
40
41impl BlockReader for VpccBox {
42    fn read_block<'a>(reader: &mut impl Reader<'a>) -> Result<Self, Error> {
43        let (version, flags) = read_box_header_ext(reader);
44
45        let profile = reader.get_u8();
46        let level = reader.get_u8();
47        let (bit_depth, chroma_subsampling, video_full_range_flag) = {
48            let b = reader.get_u8();
49            (b >> 4, b << 4 >> 5, b & 0x01 == 1)
50        };
51
52        let transfer_characteristics = reader.get_u8();
53        let matrix_coefficients = reader.get_u8();
54        let codec_initialization_data_size = reader.get_u16();
55
56        Ok(Self {
57            version,
58            flags,
59            profile,
60            level,
61            bit_depth,
62            chroma_subsampling,
63            video_full_range_flag,
64            color_primaries: 0,
65            transfer_characteristics,
66            matrix_coefficients,
67            codec_initialization_data_size,
68        })
69    }
70
71    fn size_hint() -> usize {
72        11
73    }
74}
75
76impl<W: Write> WriteBox<&mut W> for VpccBox {
77    fn write_box(&self, writer: &mut W) -> Result<u64, Error> {
78        let size = self.box_size();
79        BoxHeader::new(Self::TYPE, size).write(writer)?;
80
81        write_box_header_ext(writer, self.version, self.flags)?;
82
83        writer.write_u8(self.profile)?;
84        writer.write_u8(self.level)?;
85        writer.write_u8(
86            (self.bit_depth << 4)
87                | (self.chroma_subsampling << 1)
88                | (self.video_full_range_flag as u8),
89        )?;
90        writer.write_u8(self.color_primaries)?;
91        writer.write_u8(self.transfer_characteristics)?;
92        writer.write_u8(self.matrix_coefficients)?;
93        writer.write_u16::<BigEndian>(self.codec_initialization_data_size)?;
94
95        Ok(size)
96    }
97}
98
99#[cfg(test)]
100mod tests {
101    use super::*;
102    use crate::mp4box::BoxHeader;
103
104    #[tokio::test]
105    async fn test_vpcc() {
106        let src_box = VpccBox {
107            version: VpccBox::DEFAULT_VERSION,
108            flags: 0,
109            profile: 0,
110            level: 0x1F,
111            bit_depth: VpccBox::DEFAULT_BIT_DEPTH,
112            chroma_subsampling: 0,
113            video_full_range_flag: false,
114            color_primaries: 0,
115            transfer_characteristics: 0,
116            matrix_coefficients: 0,
117            codec_initialization_data_size: 0,
118        };
119        let mut buf = Vec::new();
120        src_box.write_box(&mut buf).unwrap();
121        assert_eq!(buf.len(), src_box.box_size() as usize);
122
123        let mut reader = buf.as_slice();
124        let header = BoxHeader::read(&mut reader, &mut 0).await.unwrap().unwrap();
125        assert_eq!(header.kind, BoxType::VpccBox);
126        assert_eq!(src_box.box_size(), header.size);
127
128        let dst_box = VpccBox::read_block(&mut reader).unwrap();
129        assert_eq!(src_box, dst_box);
130    }
131}
flowly_mp4/mp4box/vpcc.rs

flowly_mp4/mp4box/
vpcc.rs
