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mp4a: Support QT sound sample description version 1. #112

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mp4a: Support QT sound sample description version 1. #112

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12 changes: 11 additions & 1 deletion src/mp4box/mp4a.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -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 {
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