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| 1 | +use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt}; |
| 2 | +use std::io::{Read, Seek, Write}; |
| 3 | +use serde::{Serialize}; |
| 4 | + |
| 5 | +use crate::mp4box::*; |
| 6 | + |
| 7 | +#[derive(Debug, Clone, PartialEq, Serialize)] |
| 8 | +pub struct MehdBox { |
| 9 | + pub version: u8, |
| 10 | + pub flags: u32, |
| 11 | + pub fragment_duration: u64, |
| 12 | +} |
| 13 | + |
| 14 | +impl MehdBox { |
| 15 | + pub fn get_type(&self) -> BoxType { |
| 16 | + BoxType::MehdBox |
| 17 | + } |
| 18 | + |
| 19 | + pub fn get_size(&self) -> u64 { |
| 20 | + let mut size = HEADER_SIZE + HEADER_EXT_SIZE; |
| 21 | + |
| 22 | + if self.version == 1 { |
| 23 | + size += 8; |
| 24 | + } else { |
| 25 | + assert_eq!(self.version, 0); |
| 26 | + size += 4; |
| 27 | + } |
| 28 | + size |
| 29 | + } |
| 30 | +} |
| 31 | + |
| 32 | +impl Default for MehdBox { |
| 33 | + fn default() -> Self { |
| 34 | + MehdBox { |
| 35 | + version: 0, |
| 36 | + flags: 0, |
| 37 | + fragment_duration: 0, |
| 38 | + } |
| 39 | + } |
| 40 | +} |
| 41 | + |
| 42 | +impl Mp4Box for MehdBox { |
| 43 | + fn box_type(&self) -> BoxType { |
| 44 | + return self.get_type(); |
| 45 | + } |
| 46 | + |
| 47 | + fn box_size(&self) -> u64 { |
| 48 | + return self.get_size(); |
| 49 | + } |
| 50 | + |
| 51 | + fn to_json(&self) -> Result<String> { |
| 52 | + Ok(serde_json::to_string(&self).unwrap()) |
| 53 | + } |
| 54 | + |
| 55 | + fn summary(&self) -> Result<String> { |
| 56 | + let s = format!("fragment_duration={}", self.fragment_duration); |
| 57 | + Ok(s) |
| 58 | + } |
| 59 | +} |
| 60 | + |
| 61 | +impl<R: Read + Seek> ReadBox<&mut R> for MehdBox { |
| 62 | + fn read_box(reader: &mut R, size: u64) -> Result<Self> { |
| 63 | + let start = box_start(reader)?; |
| 64 | + |
| 65 | + let (version, flags) = read_box_header_ext(reader)?; |
| 66 | + |
| 67 | + let fragment_duration = if version == 1 { |
| 68 | + reader.read_u64::<BigEndian>()? |
| 69 | + } else { |
| 70 | + assert_eq!(version, 0); |
| 71 | + reader.read_u32::<BigEndian>()? as u64 |
| 72 | + }; |
| 73 | + skip_bytes_to(reader, start + size)?; |
| 74 | + |
| 75 | + Ok(MehdBox { |
| 76 | + version, |
| 77 | + flags, |
| 78 | + fragment_duration, |
| 79 | + }) |
| 80 | + } |
| 81 | +} |
| 82 | + |
| 83 | +impl<W: Write> WriteBox<&mut W> for MehdBox { |
| 84 | + fn write_box(&self, writer: &mut W) -> Result<u64> { |
| 85 | + let size = self.box_size(); |
| 86 | + BoxHeader::new(self.box_type(), size).write(writer)?; |
| 87 | + |
| 88 | + write_box_header_ext(writer, self.version, self.flags)?; |
| 89 | + |
| 90 | + if self.version == 1 { |
| 91 | + writer.write_u64::<BigEndian>(self.fragment_duration)?; |
| 92 | + } else { |
| 93 | + assert_eq!(self.version, 0); |
| 94 | + writer.write_u32::<BigEndian>(self.fragment_duration as u32)?; |
| 95 | + } |
| 96 | + |
| 97 | + Ok(size) |
| 98 | + } |
| 99 | +} |
| 100 | + |
| 101 | +#[cfg(test)] |
| 102 | +mod tests { |
| 103 | + use super::*; |
| 104 | + use crate::mp4box::BoxHeader; |
| 105 | + use std::io::Cursor; |
| 106 | + |
| 107 | + |
| 108 | + #[test] |
| 109 | + fn test_mehd32() { |
| 110 | + let src_box = MehdBox { |
| 111 | + version: 0, |
| 112 | + flags: 0, |
| 113 | + fragment_duration: 32, |
| 114 | + }; |
| 115 | + let mut buf = Vec::new(); |
| 116 | + src_box.write_box(&mut buf).unwrap(); |
| 117 | + assert_eq!(buf.len(), src_box.box_size() as usize); |
| 118 | + |
| 119 | + let mut reader = Cursor::new(&buf); |
| 120 | + let header = BoxHeader::read(&mut reader).unwrap(); |
| 121 | + assert_eq!(header.name, BoxType::MehdBox); |
| 122 | + assert_eq!(src_box.box_size(), header.size); |
| 123 | + |
| 124 | + let dst_box = MehdBox::read_box(&mut reader, header.size).unwrap(); |
| 125 | + assert_eq!(src_box, dst_box); |
| 126 | + } |
| 127 | + |
| 128 | + #[test] |
| 129 | + fn test_mehd64() { |
| 130 | + let src_box = MehdBox { |
| 131 | + version: 0, |
| 132 | + flags: 0, |
| 133 | + fragment_duration: 30439936, |
| 134 | + }; |
| 135 | + let mut buf = Vec::new(); |
| 136 | + src_box.write_box(&mut buf).unwrap(); |
| 137 | + assert_eq!(buf.len(), src_box.box_size() as usize); |
| 138 | + |
| 139 | + let mut reader = Cursor::new(&buf); |
| 140 | + let header = BoxHeader::read(&mut reader).unwrap(); |
| 141 | + assert_eq!(header.name, BoxType::MehdBox); |
| 142 | + assert_eq!(src_box.box_size(), header.size); |
| 143 | + |
| 144 | + let dst_box = MehdBox::read_box(&mut reader, header.size).unwrap(); |
| 145 | + assert_eq!(src_box, dst_box); |
| 146 | + } |
| 147 | +} |
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