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fmp4mux: Write a v0 tfdt box if the decode time is small enough

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Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/2184>
This commit is contained in:
Sebastian Dröge 2025-04-07 17:36:45 +03:00
parent 8ba5496563
commit c62139c64a
1 changed files with 26 additions and 5 deletions
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31
mux/fmp4/src/fmp4mux/boxes.rs
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@ -2066,9 +2066,25 @@ fn write_traf(
write_full_box(v, b"tfhd", FULL_BOX_VERSION_0, tf_flags, |v| {
write_tfhd(v, cfg, idx, default_size, default_duration, default_flags)
})?;
write_full_box(v, b"tfdt", FULL_BOX_VERSION_1, FULL_BOX_FLAGS_NONE, |v| {
write_tfdt(v, cfg, idx, stream, timescale)
})?;
let large_tfdt = stream
.start_time
.unwrap()
.mul_div_floor(timescale as u64, gst::ClockTime::SECOND.nseconds())
.context("base time overflow")?
.nseconds()
> u32::MAX as u64;
write_full_box(
v,
b"tfdt",
if large_tfdt {
FULL_BOX_VERSION_1
} else {
FULL_BOX_VERSION_0
},
FULL_BOX_FLAGS_NONE,
|v| write_tfdt(v, cfg, idx, stream, timescale),
)?;
let mut current_data_offset = 0;
@ -2160,9 +2176,14 @@ fn write_tfdt(
.start_time
.unwrap()
.mul_div_floor(timescale as u64, gst::ClockTime::SECOND.nseconds())
.context("base time overflow")?;
.context("base time overflow")?
.nseconds();
v.extend(base_time.to_be_bytes());
if base_time > u32::MAX as u64 {
v.extend(base_time.to_be_bytes());
} else {
v.extend((base_time as u32).to_be_bytes());
}
Ok(())
}