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Add skip fn for skipping remaining bytes in a box.

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This commit is contained in:
Alf 2020-02-05 20:22:08 -08:00
parent 67303df65e
commit f04ebb4b61
3 changed files with 20 additions and 57 deletions
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2
Cargo.lock generated
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@ -7,7 +7,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]] [[package]]
name = "mp4" name = "mp4"
version = "0.3.0" version = "0.4.0"
dependencies = [ dependencies = [
"byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)", "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
] ]

2
Cargo.toml
View file

@ -1,6 +1,6 @@
[package] [package]
name = "mp4" name = "mp4"
version = "0.3.0" version = "0.4.0"
authors = ["Alf <alf.g.jr@gmail.com>"] authors = ["Alf <alf.g.jr@gmail.com>"]
edition = "2018" edition = "2018"

73
src/atoms.rs
View file

@ -390,11 +390,7 @@ fn parse_mvhd_box(f: &mut BufReader<File>, _offset: u64, size: u32) -> Result<Mv
let timescale = f.read_u32::<BigEndian>().unwrap(); let timescale = f.read_u32::<BigEndian>().unwrap();
let duration = f.read_u32::<BigEndian>().unwrap(); let duration = f.read_u32::<BigEndian>().unwrap();
let rate = f.read_u32::<BigEndian>().unwrap(); let rate = f.read_u32::<BigEndian>().unwrap();
skip(f, current, size);
// Skip remaining bytes.
let after = f.seek(SeekFrom::Current(0)).unwrap();
let remaining_bytes = (size as u64 - (after - current)) as i64;
f.seek(SeekFrom::Current(remaining_bytes - HEADER_SIZE as i64)).unwrap();
Ok(MvhdBox{ Ok(MvhdBox{
version, version,
@ -433,11 +429,8 @@ fn parse_trak_box(f: &mut BufReader<File>, _offset: u64, size: u32) -> Result<Tr
_ => break _ => break
} }
} }
skip(f, current, size);
// Skip remaining bytes.
let after = f.seek(SeekFrom::Current(0)).unwrap();
let remaining_bytes = (size as u64 - (after - current)) as i64;
f.seek(SeekFrom::Current(remaining_bytes - HEADER_SIZE as i64)).unwrap();
Ok(trak) Ok(trak)
} }
@ -474,11 +467,7 @@ fn parse_tkhd_box(f: &mut BufReader<File>, _offset: u64, size: u32) -> Result<Tk
let width = f.read_u32::<BigEndian>().unwrap() >> 8; let width = f.read_u32::<BigEndian>().unwrap() >> 8;
let height = f.read_u32::<BigEndian>().unwrap() >> 8; let height = f.read_u32::<BigEndian>().unwrap() >> 8;
skip(f, current, size);
// Skip remaining bytes.
let after = f.seek(SeekFrom::Current(0)).unwrap();
let remaining_bytes = (size as u64 - (after - current)) as i64;
f.seek(SeekFrom::Current(remaining_bytes - HEADER_SIZE as i64)).unwrap();
Ok(TkhdBox { Ok(TkhdBox {
version, version,
@ -514,11 +503,8 @@ fn parse_edts_box(f: &mut BufReader<File>, _offset: u64, size: u32) -> Result<Ed
_ => break _ => break
} }
} }
skip(f, current, size);
// Skip remaining bytes.
let after = f.seek(SeekFrom::Current(0)).unwrap();
let remaining_bytes = (size as u64 - (after - current)) as i64;
f.seek(SeekFrom::Current(remaining_bytes - HEADER_SIZE as i64)).unwrap();
Ok(edts) Ok(edts)
} }
@ -539,11 +525,7 @@ fn parse_elst_box(f: &mut BufReader<File>, _offset: u64, size: u32) -> Result<El
}; };
entries.push(entry); entries.push(entry);
} }
skip(f, current, size);
// Skip remaining bytes.
let after = f.seek(SeekFrom::Current(0)).unwrap();
let remaining_bytes = (size as u64 - (after - current)) as i64;
f.seek(SeekFrom::Current(remaining_bytes - HEADER_SIZE as i64)).unwrap();
Ok(ElstBox { Ok(ElstBox {
version, version,
@ -578,11 +560,8 @@ fn parse_mdia_box(f: &mut BufReader<File>, _offset: u64, size: u32) -> Result<Md
_ => break _ => break
} }
} }
skip(f, current, size);
// Skip remaining bytes.
let after = f.seek(SeekFrom::Current(0)).unwrap();
let remaining_bytes = (size as u64 - (after - current)) as i64;
f.seek(SeekFrom::Current(remaining_bytes - HEADER_SIZE as i64)).unwrap();
Ok(mdia) Ok(mdia)
} }
@ -600,11 +579,7 @@ fn parse_mdhd_box(f: &mut BufReader<File>, _offset: u64, size: u32) -> Result<Md
let duration = f.read_u32::<BigEndian>().unwrap(); let duration = f.read_u32::<BigEndian>().unwrap();
let language = f.read_u16::<BigEndian>().unwrap(); let language = f.read_u16::<BigEndian>().unwrap();
let language_string = get_language_string(language); let language_string = get_language_string(language);
skip(f, current, size);
// Skip remaining bytes.
let after = f.seek(SeekFrom::Current(0)).unwrap();
let remaining_bytes = (size as u64 - (after - current)) as i64;
f.seek(SeekFrom::Current(remaining_bytes - HEADER_SIZE as i64)).unwrap();
Ok(MdhdBox { Ok(MdhdBox {
version, version,
@ -653,11 +628,7 @@ fn parse_hdlr_box(f: &mut BufReader<File>, _offset: u64, size: u32) -> Result<Hd
Ok(t) => t, Ok(t) => t,
_ => String::from("null"), _ => String::from("null"),
}; };
skip(f, current, size);
// Skip remaining bytes.
let after = f.seek(SeekFrom::Current(0)).unwrap();
let remaining_bytes = (size as u64 - (after - current)) as i64;
f.seek(SeekFrom::Current(remaining_bytes - HEADER_SIZE as i64)).unwrap();
Ok(HdlrBox { Ok(HdlrBox {
version, version,
@ -695,11 +666,8 @@ fn parse_minf_box(f: &mut BufReader<File>, _offset: u64, size: u32) -> Result<Mi
_ => break _ => break
} }
} }
skip(f, current, size);
// Skip remaining bytes.
let after = f.seek(SeekFrom::Current(0)).unwrap();
let remaining_bytes = (size as u64 - (after - current)) as i64;
f.seek(SeekFrom::Current(remaining_bytes - HEADER_SIZE as i64)).unwrap();
Ok(minf) Ok(minf)
} }
@ -713,11 +681,7 @@ fn parse_vmhd_box(f: &mut BufReader<File>, _offset: u64, size: u32) -> Result<Vm
let flags = u32::from(flags_a) << 16 | u32::from(flags_b) << 8 | u32::from(flags_c); let flags = u32::from(flags_a) << 16 | u32::from(flags_b) << 8 | u32::from(flags_c);
let graphics_mode = f.read_u16::<BigEndian>().unwrap(); let graphics_mode = f.read_u16::<BigEndian>().unwrap();
let op_color = f.read_u16::<BigEndian>().unwrap(); let op_color = f.read_u16::<BigEndian>().unwrap();
skip(f, current, size);
// Skip remaining bytes.
let after = f.seek(SeekFrom::Current(0)).unwrap();
let remaining_bytes = (size as u64 - (after - current)) as i64;
f.seek(SeekFrom::Current(remaining_bytes - HEADER_SIZE as i64)).unwrap();
Ok(VmhdBox { Ok(VmhdBox {
version, version,
@ -769,11 +733,7 @@ fn parse_stts_box(f: &mut BufReader<File>, _offset: u64, size: u32) -> Result<St
sample_counts.push(sc); sample_counts.push(sc);
sample_deltas.push(sd); sample_deltas.push(sd);
} }
skip(f, current, size);
// Skip remaining bytes.
let after = f.seek(SeekFrom::Current(0)).unwrap();
let remaining_bytes = (size as u64 - (after - current)) as i64;
f.seek(SeekFrom::Current(remaining_bytes - HEADER_SIZE as i64)).unwrap();
Ok(SttsBox { Ok(SttsBox {
version, version,
@ -810,13 +770,16 @@ fn parse_stsd_box(f: &mut BufReader<File>, _offset: u64, size: u32) -> Result<St
_ => break _ => break
} }
} }
skip(f, current, size);
// Skip remaining bytes.
let after = f.seek(SeekFrom::Current(0)).unwrap();
let remaining_bytes = (size as u64 - (after - current)) as i64;
f.seek(SeekFrom::Current(remaining_bytes - HEADER_SIZE as i64)).unwrap();
Ok(StsdBox { Ok(StsdBox {
version, version,
flags, flags,
}) })
} }
fn skip(f: &mut BufReader<File>, current: u64, size: u32) {
let after = f.seek(SeekFrom::Current(0)).unwrap();
let remaining_bytes = (size as u64 - (after - current)) as i64;
f.seek(SeekFrom::Current(remaining_bytes - HEADER_SIZE as i64)).unwrap();
}