Implement audiounit_make_silent

README.md

@@ -49,9 +49,9 @@ Currently it can only be built by *rust-nightly* since we use *nightly-only* ato
 
 ### Interanl APIs
 
-- 🥚 : 14/75 (18.6%)
+- 🥚 : 13/75 (17.3%)
 - 🐣 : 7/75 (9.3%)
-- 🐥 : 54/75 (72%)
+- 🐥 : 55/75 (73.3%)
 
 | Interanl AudioUnit APIs                     | status |
 | ------------------------------------------- | ------ |
@@ -65,7 +65,7 @@ Currently it can only be built by *rust-nightly* since we use *nightly-only* ato
 | audiounit_decrement_active_streams          | 🐥      |
 | audiounit_active_streams                    | 🐥      |
 | audiounit_set_global_latency                | 🐥      |
-| audiounit_make_silent                       | 🥚      |
+| audiounit_make_silent                       | 🐥      |
 | audiounit_render_input                      | 🐥      |
 | audiounit_input_callback                    | 🐥      |
 | audiounit_mix_output_buffer                 | 🥚      |

src/backend/mod.rs

@@ -242,6 +242,13 @@ fn audiounit_set_global_latency(ctx: &mut AudioUnitContext, latency_frames: u32)
     ctx.global_latency_frames = latency_frames;
 }
 
+fn audiounit_make_silent(ioData: &mut AudioBuffer) {
+    assert!(!ioData.mData.is_null());
+    unsafe {
+        libc::memset(ioData.mData, 0, ioData.mDataByteSize as usize);
+    }
+}
+
 fn audiounit_render_input(stm: &mut AudioUnitStream,
                           flags: *mut AudioUnitRenderActionFlags,
                           tstamp: *const AudioTimeStamp,

src/backend/test.rs

@@ -896,6 +896,26 @@ fn test_set_global_latency() {
     }
 }
 
+// make_silent
+// ------------------------------------
+#[test]
+fn test_make_silent() {
+    let mut array = allocate_array::<u32>(10);
+    for data in array.iter_mut() {
+        *data = 0xFFFF;
+    }
+
+    let mut buffer = AudioBuffer::default();
+    buffer.mData = array.as_mut_ptr() as *mut c_void;
+    buffer.mDataByteSize = (array.len() * mem::size_of::<u32>()) as u32;
+    buffer.mNumberChannels = 1;
+
+    audiounit_make_silent(&mut buffer);
+    for data in array {
+        assert_eq!(data, 0);
+    }
+}
+
 // render_input
 // ------------------------------------
 // TODO