sanity check

src/mpv/format.rs

@@ -1,5 +1,5 @@
 use super::{ffi, Error};
-use std::ffi::{c_char, c_int, c_void, CString};
+use std::ffi::{c_char, c_int, c_void, CStr, CString};
 
 pub trait SetProperty {
     /// # Safety
@@ -121,3 +121,18 @@ impl GetProperty for i64 {
         Ok(value)
     }
 }
+
+impl GetProperty for String {
+    unsafe fn get_property(ctx: *mut ffi::mpv_handle, name: *const c_char) -> Result<Self, Error> {
+        let mut value: *mut c_char = std::ptr::null_mut();
+        Error::from_return_code(ffi::mpv_get_property(
+            ctx,
+            name,
+            ffi::mpv_format_MPV_FORMAT_STRING,
+            std::ptr::from_mut::<*mut c_char>(&mut value) as *mut c_void,
+        ))?;
+        let result = CStr::from_ptr(value).to_string_lossy().into_owned();
+        ffi::mpv_free(value as *mut c_void);
+        Ok(result)
+    }
+}

src/playbin2.rs

@@ -229,6 +229,12 @@ where
                 // since we set up the hook before, the current song is guaranteed not to change
                 // under our feet
                 self.file_started.emit(self, ());
+
+                // sanity check
+                assert_eq!(
+                    self.entries()[self.current_entry().unwrap()].url().as_str(),
+                    &self.mpv.get_property::<String>("path").unwrap()
+                );
             }
 
             _ => println!("mpv event {:?}", event),