Implement make_sized_audio_channel_layout

README.md

@@ -59,13 +59,13 @@ By applying the [patch][integrate-with-cubeb] to integrate within [Cubeb][cubeb]
 
 ### Interanl APIs
 
-- 🥚 : 10/75 (13.3%)
+- 🥚 : 9/75 (12%)
 - 🐣 : 7/75 (9.3%)
-- 🐥 : 58/75 (77.3%)
+- 🐥 : 59/75 (78.6%)
 
 | Interanl AudioUnit APIs                     | status |
 | ------------------------------------------- | ------ |
-| make_sized_audio_channel_layout             | 🥚      |
+| make_sized_audio_channel_layout             | 🐥      |
 | to_string                                   | 🐥      |
 | has_input                                   | 🐥      |
 | has_output                                  | 🐥      |

src/backend/mod.rs

@@ -150,6 +150,21 @@ enum io_side {
   OUTPUT,
 }
 
+fn make_sized_audio_channel_layout(sz: usize) -> AutoRelease<AudioChannelLayout> {
+    assert!(sz >= mem::size_of::<AudioChannelLayout>());
+    assert_eq!(
+        (sz - mem::size_of::<AudioChannelLayout>()) % mem::size_of::<AudioChannelDescription>(),
+        0
+    );
+    let acl = unsafe { libc::calloc(1, sz) } as *mut AudioChannelLayout;
+
+    unsafe extern "C" fn free_acl(acl: *mut AudioChannelLayout) {
+        libc::free(acl as *mut c_void);
+    }
+
+    AutoRelease::new(acl, free_acl)
+}
+
 fn to_string(side: &io_side) -> &'static str
 {
     match side {

src/backend/test.rs

@@ -825,6 +825,28 @@ fn test_manual_ctx_stream_register_device_changed_callback() {
 
 // Private APIs
 // ============================================================================
+// make_sized_audio_channel_layout
+// ------------------------------------
+#[test]
+#[should_panic]
+fn test_make_sized_audio_channel_layout_with_wrong_size() {
+    // let _ = make_sized_audio_channel_layout(0);
+    let one_channel_size = mem::size_of::<AudioChannelLayout>();
+    let padding_size = 10;
+    assert_ne!(mem::size_of::<AudioChannelDescription>(), padding_size);
+    let wrong_size = one_channel_size + padding_size;
+    let _ = make_sized_audio_channel_layout(wrong_size);
+}
+
+#[test]
+fn test_make_sized_audio_channel_layout() {
+    for channels in 1..10 {
+        let size = mem::size_of::<AudioChannelLayout>()
+            + (channels - 1) * mem::size_of::<AudioChannelDescription>();
+        let _ = make_sized_audio_channel_layout(size);
+    }
+}
+
 // to_string
 // ------------------------------------
 #[test]