Cleanup

src/detail/transport_player.hpp

@@ -16,6 +16,7 @@ struct transport_state {
   std::uint32_t channels{};
   std::uint64_t duration{};
   mutable std::uint64_t cursor{};
+  mutable std::size_t first_live_click{};
   sonus::transport_config config{};
   std::array<std::vector<std::float32_t>, 2> samples{};
   mutable std::vector<std::float32_t> scratch{};

src/transport.cpp

@@ -155,7 +155,18 @@ auto sonus::detail::transport_player::render(std::float32_t *output, std::uint64
         return;
       }
     }
-    for (auto const &click : state->config.clicks) {
+    // Retain overlapping tails, but never revisit an expired schedule prefix.
+    // The cursor is owned by the render thread and needs no allocation or lock.
+    while (state->first_live_click < state->config.clicks.size()) {
+      auto const &click = state->config.clicks[state->first_live_click];
+      auto length = state->samples[click.downbeat ? 0 : 1].size() / channels;
+      if (click.frame > state->cursor || length > state->cursor - click.frame) {
+        break;
+      }
+      ++state->first_live_click;
+    }
+    for (auto index = state->first_live_click; index < state->config.clicks.size(); ++index) {
+      auto const &click = state->config.clicks[index];
       if (click.frame >= state->cursor + count) {
         break;
       }