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fmp4mux: Add new decode-time-offset property

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This allows shifting the decoding timeline by changing the decode time
of all streams in the tfdt box.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/2193>
This commit is contained in:
Sebastian Dröge 2025-04-09 12:54:26 +03:00 committed by GStreamer Marge Bot
parent 6ff5b8d019
commit dd6cf65a18
2 changed files with 67 additions and 1 deletions
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14
docs/plugins/gst_plugins_cache.json
View file

@ -3404,6 +3404,20 @@
"type": "guint64",
"writable": true
},
"decode-time-offset": {
"blurb": "Offset to apply to the tfdt",
"conditionally-available": false,
"construct": false,
"construct-only": false,
"controllable": false,
"default": "0",
"max": "9223372036854775807",
"min": "-9223372036854775808",
"mutable": "ready",
"readable": true,
"type": "gint64",
"writable": true
},
"fragment-duration": {
"blurb": "Duration for each FMP4 fragment in nanoseconds",
"conditionally-available": false,

54
mux/fmp4/src/fmp4mux/imp.rs
View file

@ -114,6 +114,8 @@ const DEFAULT_INTERLEAVE_TIME: Option<gst::ClockTime> = Some(gst::ClockTime::fro
const DEFAULT_WRITE_EDTS_MODE: WriteEdtsMode = WriteEdtsMode::Auto;
const DEFAULT_SEND_FORCE_KEYUNIT: bool = true;
const DEFAULT_MANUAL_SPLIT: bool = false;
const DEFAULT_OFFSET_TO_ZERO: bool = false;
const DEFAULT_DECODE_TIME_OFFSET: gst::ClockTimeDiff = 0;
#[derive(Debug, Clone)]
struct Settings {
@ -129,6 +131,7 @@ struct Settings {
write_edts_mode: WriteEdtsMode,
send_force_keyunit: bool,
manual_split: bool,
decode_time_offset: gst::ClockTimeDiff,
}
impl Default for Settings {
@ -142,10 +145,11 @@ impl Default for Settings {
interleave_bytes: DEFAULT_INTERLEAVE_BYTES,
interleave_time: DEFAULT_INTERLEAVE_TIME,
movie_timescale: 0,
offset_to_zero: false,
offset_to_zero: DEFAULT_OFFSET_TO_ZERO,
write_edts_mode: DEFAULT_WRITE_EDTS_MODE,
send_force_keyunit: DEFAULT_SEND_FORCE_KEYUNIT,
manual_split: DEFAULT_MANUAL_SPLIT,
decode_time_offset: DEFAULT_DECODE_TIME_OFFSET,
}
}
}
@ -3083,6 +3087,30 @@ impl FMP4Mux {
}
}
if settings.decode_time_offset != 0 {
for stream in &mut streams {
if let Some(start_time) = stream.start_time {
if settings.decode_time_offset >= 0 {
stream.start_time = Some(
start_time
.checked_add(gst::ClockTime::from_nseconds(
settings.decode_time_offset as u64,
))
.unwrap(),
);
} else {
stream.start_time = Some(
start_time
.checked_sub(gst::ClockTime::from_nseconds(
(-settings.decode_time_offset) as u64,
))
.unwrap(),
);
}
}
}
}
if interleaved_buffers.is_empty() {
assert!(at_eos);
return Ok((caps, None));
@ -3886,6 +3914,22 @@ impl ObjectImpl for FMP4Mux {
.default_value(DEFAULT_MANUAL_SPLIT)
.mutable_ready()
.build(),
/**
* GstFMP4Mux:decode-time-offset:
*
* Offset to apply to the decode time in the tfdt box. By default the offset is the
* running time of the first DTS or earliest PTS of the stream.
*
* This can be used to shift the decoding timeline.
*
* Since: plugins-rs-0.14.0
*/
glib::ParamSpecInt64::builder("decode-time-offset")
.nick("Decode Time Offset")
.blurb("Offset to apply to the tfdt")
.default_value(DEFAULT_DECODE_TIME_OFFSET)
.mutable_ready()
.build(),
]
});
@ -3967,6 +4011,10 @@ impl ObjectImpl for FMP4Mux {
let mut settings = self.settings.lock().unwrap();
settings.manual_split = value.get().expect("type checked upstream");
}
"decode-time-offset" => {
let mut settings = self.settings.lock().unwrap();
settings.decode_time_offset = value.get().expect("type checked upstream");
}
_ => unimplemented!(),
}
}
@ -4024,6 +4072,10 @@ impl ObjectImpl for FMP4Mux {
let settings = self.settings.lock().unwrap();
settings.manual_split.to_value()
}
"decode-time-offset" => {
let settings = self.settings.lock().unwrap();
settings.decode_time_offset.to_value()
}
_ => unimplemented!(),
}
}