From 877f5c906cd6264434f40714826ffbd2099b3674 Mon Sep 17 00:00:00 2001
From: jazzfool <shamoslover69@gmail.com>
Date: Sun, 6 Oct 2024 21:36:20 +1100
Subject: [PATCH] do not busy loop when paused

---
 src/video.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/video.rs b/src/video.rs
index 0a7a66d..12c0e1b 100644
--- a/src/video.rs
+++ b/src/video.rs
@@ -237,6 +237,7 @@ impl Video {
         let alive = Arc::new(AtomicBool::new(true));
         let last_frame_time = Arc::new(Mutex::new(Instant::now()));
 
+        let pipeline_ref = pipeline.clone();
         let frame_ref = Arc::clone(&frame);
         let upload_frame_ref = Arc::clone(&upload_frame);
         let alive_ref = Arc::clone(&alive);
@@ -245,6 +246,13 @@ impl Video {
         let worker = std::thread::spawn(move || {
             while alive_ref.load(Ordering::Acquire) {
                 let frame_interval = std::time::Duration::from_secs_f64(1.0 / framerate);
+
+                let state = pipeline_ref.state(None).1;
+                if state != gst::State::Playing {
+                    // otherwise thread will busy loop pulling preroll
+                    std::thread::sleep(2 * frame_interval);
+                }
+
                 if let Err(gst::FlowError::Error) = (|| -> Result<(), gst::FlowError> {
                     let timeout =
                         gst::ClockTime::from_nseconds(2 * frame_interval.as_nanos() as u64);