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mp4a: Support QT sound sample description version 1.

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If the QT version in a sound sample description is set to 1, there are 4
additional 32-bit integers in the description record according to QT
docs.

At least some recently sold iPhones produce sound sample description
records like this, so this change fixes a parsing failure for these
files.
This commit is contained in:
Florian Will 2023-06-30 09:25:14 +02:00
parent 55875d72de
commit d9b5755713
1 changed files with 11 additions and 1 deletions
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12
src/mp4box/mp4a.rs
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@ -83,12 +83,22 @@ impl<R: Read + Seek> ReadBox<&mut R> for Mp4aBox {
reader.read_u16::<BigEndian>()?; // reserved
let data_reference_index = reader.read_u16::<BigEndian>()?;
reader.read_u64::<BigEndian>()?; // reserved
// Next 8 bytes should be all 0 in ISO MP4
let qt_version = reader.read_u16::<BigEndian>()?; // QT: 0, 1 or 2
reader.read_u16::<BigEndian>()?; // QT: revision level, should be 0
reader.read_u32::<BigEndian>()?; // QT: vendor, should be 0
let channelcount = reader.read_u16::<BigEndian>()?;
let samplesize = reader.read_u16::<BigEndian>()?;
reader.read_u32::<BigEndian>()?; // pre-defined, reserved
let samplerate = FixedPointU16::new_raw(reader.read_u32::<BigEndian>()?);
if qt_version == 1 {
// Samples per packet, bytes per packet,
// bytes per frame, bytes per sample
skip_bytes(reader, 4 * 4)?;
}
let mut esds = None;
let current = reader.stream_position()?;
if current < start + size {