textahead: fix previous buffers

Actually implement a proper queue.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1033>

1 files changed, 4 insertions, 3 deletions

diff --git a/text/ahead/src/textahead/imp.rs b/text/ahead/src/textahead/imp.rs
index 82dc1f1b4..6af01de99 100644
--- a/text/ahead/src/textahead/imp.rs
+++ b/text/ahead/src/textahead/imp.rs
@@ -6,6 +6,7 @@
 //
 // SPDX-License-Identifier: MPL-2.0
 
+use std::collections::VecDeque;
 use std::sync::{Mutex, MutexGuard};
 
 use once_cell::sync::Lazy;
@@ -54,7 +55,7 @@ struct Input {
 
 #[derive(Default)]
 struct State {
-    previous: Vec<Input>,
+    previous: VecDeque<Input>,
     pending: Vec<Input>,
     done: bool,
     /// Segment for which we should send a buffer with ahead text. Only set if `Settings.buffer_start_segment` is set.
@@ -425,10 +426,10 @@ impl TextAhead {
             let duration = current.duration;
 
             if settings.n_previous > 0 {
-                state.previous.push(current);
+                state.previous.push_back(current);
 
                 if state.previous.len() > settings.n_previous as usize {
-                    state.previous.pop();
+                    state.previous.pop_front();
                 }
             }