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mccparse: Map timecode to PTS directly without offset

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Assumes that caption stream's timeline starts from zero,
and maps timecode time_since_daily_jam() to PTS directly without
subtracting the first seen timecode.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1246>
This commit is contained in:
Seungha Yang 2023-06-16 00:48:39 +09:00
parent 26fd68a37c
commit 02c77d2e44
1 changed files with 0 additions and 18 deletions
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18
video/closedcaption/src/mcc_parse/imp.rs
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@ -60,7 +60,6 @@ struct State {
format: Option<Format>, format: Option<Format>,
need_segment: bool, need_segment: bool,
pending_events: Vec<gst::Event>, pending_events: Vec<gst::Event>,
start_position: Option<gst::ClockTime>,
last_position: Option<gst::ClockTime>, last_position: Option<gst::ClockTime>,
last_timecode: Option<gst_video::ValidVideoTimeCode>, last_timecode: Option<gst_video::ValidVideoTimeCode>,
timecode_rate: Option<(u8, bool)>, timecode_rate: Option<(u8, bool)>,
@ -86,7 +85,6 @@ impl Default for State {
format: None, format: None,
need_segment: true, need_segment: true,
pending_events: Vec::new(), pending_events: Vec::new(),
start_position: None,
last_position: None, last_position: None,
last_timecode: None, last_timecode: None,
timecode_rate: None, timecode_rate: None,
@ -204,21 +202,6 @@ impl State {
/// not produce timestamps jumping backwards /// not produce timestamps jumping backwards
fn update_timestamp(&mut self, imp: &MccParse, timecode: &gst_video::ValidVideoTimeCode) { fn update_timestamp(&mut self, imp: &MccParse, timecode: &gst_video::ValidVideoTimeCode) {
let nsecs = timecode.time_since_daily_jam(); let nsecs = timecode.time_since_daily_jam();
if self.start_position.is_none() {
self.start_position = Some(nsecs);
}
let start_position = self.start_position.expect("checked above");
let nsecs = nsecs.checked_sub(start_position).unwrap_or_else(|| {
gst::fixme!(
CAT,
imp: imp,
"New position {} < start position {}",
nsecs,
start_position,
);
start_position
});
if self if self
.last_position .last_position
@ -849,7 +832,6 @@ impl MccParse {
state.segment = gst::FormattedSegment::new(); state.segment = gst::FormattedSegment::new();
state.need_segment = true; state.need_segment = true;
state.pending_events.clear(); state.pending_events.clear();
state.start_position = Some(gst::ClockTime::ZERO);
state.last_position = None; state.last_position = None;
state.last_timecode = None; state.last_timecode = None;
state.timecode_rate = None; state.timecode_rate = None;