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streamproducer: expose set_forward_preroll() API

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This is useful to decide whether the preroll sample should be forwarded
to consumers when prerolling or only once it is time to render it.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1439>
This commit is contained in:
Mathieu Duponchelle 2024-05-09 20:12:34 +02:00 committed by GStreamer Marge Bot
parent 455996c60b
commit 0ef80c4fe7
1 changed files with 14 additions and 2 deletions
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12
gstreamer-utils/src/streamproducer.rs
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@ -364,6 +364,11 @@ impl StreamProducer {
self.consumers.lock().unwrap().events_to_forward = events_to_forward.into_iter().collect(); self.consumers.lock().unwrap().events_to_forward = events_to_forward.into_iter().collect();
} }
/// configure whether the preroll sample should be forwarded (default: `true`)
pub fn set_forward_preroll(&self, forward_preroll: bool) {
self.consumers.lock().unwrap().forward_preroll = forward_preroll;
}
/// Get the GStreamer `appsink` wrapped by this producer /// Get the GStreamer `appsink` wrapped by this producer
pub fn appsink(&self) -> &gst_app::AppSink { pub fn appsink(&self) -> &gst_app::AppSink {
&self.appsink &self.appsink
@ -399,6 +404,7 @@ impl<'a> From<&'a gst_app::AppSink> for StreamProducer {
// it would make sense to automatically forward more events such as Tag but that would break // it would make sense to automatically forward more events such as Tag but that would break
// with older GStreamer, see https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4297 // with older GStreamer, see https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4297
events_to_forward: vec![gst::EventType::Eos], events_to_forward: vec![gst::EventType::Eos],
forward_preroll: true,
just_forwarded_preroll: false, just_forwarded_preroll: false,
})); }));
@ -434,9 +440,13 @@ impl<'a> From<&'a gst_app::AppSink> for StreamProducer {
} }
}; };
if consumers.forward_preroll {
consumers.just_forwarded_preroll = true; consumers.just_forwarded_preroll = true;
StreamProducer::process_sample(sample, appsink, consumers) StreamProducer::process_sample(sample, appsink, consumers)
} else {
Ok(gst::FlowSuccess::Ok)
}
})) }))
.new_event(glib::clone!(@strong consumers => move |appsink| { .new_event(glib::clone!(@strong consumers => move |appsink| {
match appsink.pull_object().map(|obj| obj.downcast::<gst::Event>()) { match appsink.pull_object().map(|obj| obj.downcast::<gst::Event>()) {
@ -525,6 +535,8 @@ struct StreamConsumers {
consumers: HashMap<gst_app::AppSrc, StreamConsumer>, consumers: HashMap<gst_app::AppSrc, StreamConsumer>,
/// What events should be forwarded to consumers /// What events should be forwarded to consumers
events_to_forward: Vec<gst::EventType>, events_to_forward: Vec<gst::EventType>,
/// Whether the preroll sample should be forwarded at all
forward_preroll: bool,
/// Whether we just forwarded the preroll sample. When we did we want to /// Whether we just forwarded the preroll sample. When we did we want to
/// discard the next sample from on_new_sample as it would cause us to /// discard the next sample from on_new_sample as it would cause us to
/// otherwise push out the same sample twice to consumers. /// otherwise push out the same sample twice to consumers.