egui

src/iq_reader.rs

@@ -28,12 +28,14 @@ pub struct FileSource {
     pub chunk_samples_size: usize,
     // raw_buffer position (in samples)
     pub cursor: usize,
+    // The length of the file in samples
+    pub len: u64,
 }
 
 impl FileSource {
     pub fn new(file_path: &str, chunk_samples_size: usize) -> Result<Self, Box<dyn Error>> {
         let file = File::open(file_path)?;
-
+        let len = file.metadata().unwrap().len() / 2;
         // Init buffer with size 16 Mo
         let reader = BufReader::with_capacity(16 * 1024 * 1024, file);
 
@@ -45,13 +47,20 @@ impl FileSource {
             raw_buffer: raw_reader,
             chunk_samples_size,
             cursor: chunk_samples_size,
+            len,
         })
     }
 }
 
+impl ExactSizeIterator for FileSource {}
+
 impl Iterator for FileSource {
     type Item = Result<IqSample, Box<dyn Error>>;
 
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        (self.len as usize, Some(self.len as usize))
+    }
+
     fn next(&mut self) -> Option<Self::Item> {
         if self.cursor >= self.chunk_samples_size {
             // Buffer read chunk