ndi: Fix/silence various clippy warnings

net/ndi/src/ndi.rs

@@ -1,6 +1,7 @@
 use crate::ndisys;
 use crate::ndisys::*;
 use std::ffi;
+use std::fmt;
 use std::mem;
 use std::ptr;
 
@@ -226,11 +227,11 @@ impl<'a> RecvBuilder<'a> {
                     p_ndi_name: ndi_name
                         .as_ref()
                         .map(|s| s.as_ptr())
-                        .unwrap_or_else(|| ptr::null_mut()),
+                        .unwrap_or(ptr::null_mut()),
                     p_url_address: url_address
                         .as_ref()
                         .map(|s| s.as_ptr())
-                        .unwrap_or_else(|| ptr::null_mut()),
+                        .unwrap_or(ptr::null_mut()),
                 },
                 allow_video_fields: self.allow_video_fields,
                 bandwidth: self.bandwidth,
@@ -252,6 +253,17 @@ pub struct RecvInstance(ptr::NonNull<::std::os::raw::c_void>);
 
 unsafe impl Send for RecvInstance {}
 
+#[derive(Debug, Copy, Clone)]
+pub struct ReceiveError;
+
+impl fmt::Display for ReceiveError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Receive error")
+    }
+}
+
+impl std::error::Error for ReceiveError {}
+
 impl RecvInstance {
     pub fn builder<'a>(
         ndi_name: Option<&'a str>,
@@ -284,7 +296,7 @@ impl RecvInstance {
         }
     }
 
-    pub fn capture(&self, timeout_in_ms: u32) -> Result<Option<Frame>, ()> {
+    pub fn capture(&self, timeout_in_ms: u32) -> Result<Option<Frame>, ReceiveError> {
         unsafe {
             let ptr = self.0.as_ptr();
 
@@ -310,7 +322,7 @@ impl RecvInstance {
                 NDIlib_frame_type_e::NDIlib_frame_type_metadata => Ok(Some(Frame::Metadata(
                     MetadataFrame::Borrowed(metadata_frame, self),
                 ))),
-                NDIlib_frame_type_e::NDIlib_frame_type_error => Err(()),
+                NDIlib_frame_type_e::NDIlib_frame_type_error => Err(ReceiveError),
                 _ => Ok(None),
             }
         }
@@ -444,6 +456,17 @@ pub enum VideoFrame<'a> {
     ),
 }
 
+#[derive(Debug, Copy, Clone)]
+pub struct TryFromVideoFrameError;
+
+impl fmt::Display for TryFromVideoFrameError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Can't handle video frame")
+    }
+}
+
+impl std::error::Error for TryFromVideoFrameError {}
+
 impl<'a> VideoFrame<'a> {
     pub fn xres(&self) -> i32 {
         match self {
@@ -702,7 +725,7 @@ impl<'a> VideoFrame<'a> {
     pub fn try_from_video_frame(
         frame: &'a gst_video::VideoFrameRef<&'a gst::BufferRef>,
         timecode: i64,
-    ) -> Result<Self, ()> {
+    ) -> Result<Self, TryFromVideoFrameError> {
         // Planar formats must be in contiguous memory
         let format = match frame.format() {
             gst_video::VideoFormat::Uyvy => ndisys::NDIlib_FourCC_video_type_UYVY,
@@ -711,14 +734,14 @@ impl<'a> VideoFrame<'a> {
                     .checked_sub(frame.plane_data(0).unwrap().as_ptr() as usize)
                     != Some(frame.height() as usize * frame.plane_stride()[0] as usize)
                 {
-                    return Err(());
+                    return Err(TryFromVideoFrameError);
                 }
 
                 if (frame.plane_data(2).unwrap().as_ptr() as usize)
                     .checked_sub(frame.plane_data(1).unwrap().as_ptr() as usize)
                     != Some((frame.height() as usize + 1) / 2 * frame.plane_stride()[1] as usize)
                 {
-                    return Err(());
+                    return Err(TryFromVideoFrameError);
                 }
 
                 ndisys::NDIlib_FourCC_video_type_I420
@@ -728,7 +751,7 @@ impl<'a> VideoFrame<'a> {
                     .checked_sub(frame.plane_data(0).unwrap().as_ptr() as usize)
                     != Some(frame.height() as usize * frame.plane_stride()[0] as usize)
                 {
-                    return Err(());
+                    return Err(TryFromVideoFrameError);
                 }
 
                 ndisys::NDIlib_FourCC_video_type_NV12
@@ -738,7 +761,7 @@ impl<'a> VideoFrame<'a> {
                     .checked_sub(frame.plane_data(0).unwrap().as_ptr() as usize)
                     != Some(frame.height() as usize * frame.plane_stride()[0] as usize)
                 {
-                    return Err(());
+                    return Err(TryFromVideoFrameError);
                 }
 
                 ndisys::NDIlib_FourCC_video_type_NV12
@@ -748,14 +771,14 @@ impl<'a> VideoFrame<'a> {
                     .checked_sub(frame.plane_data(0).unwrap().as_ptr() as usize)
                     != Some(frame.height() as usize * frame.plane_stride()[0] as usize)
                 {
-                    return Err(());
+                    return Err(TryFromVideoFrameError);
                 }
 
                 if (frame.plane_data(2).unwrap().as_ptr() as usize)
                     .checked_sub(frame.plane_data(1).unwrap().as_ptr() as usize)
                     != Some((frame.height() as usize + 1) / 2 * frame.plane_stride()[1] as usize)
                 {
-                    return Err(());
+                    return Err(TryFromVideoFrameError);
                 }
 
                 ndisys::NDIlib_FourCC_video_type_YV12
@@ -764,7 +787,7 @@ impl<'a> VideoFrame<'a> {
             gst_video::VideoFormat::Bgrx => ndisys::NDIlib_FourCC_video_type_BGRX,
             gst_video::VideoFormat::Rgba => ndisys::NDIlib_FourCC_video_type_RGBA,
             gst_video::VideoFormat::Rgbx => ndisys::NDIlib_FourCC_video_type_RGBX,
-            _ => return Err(()),
+            _ => return Err(TryFromVideoFrameError),
         };
 
         let frame_format_type = match frame.info().interlace_mode() {
@@ -787,7 +810,7 @@ impl<'a> VideoFrame<'a> {
             {
                 NDIlib_frame_format_type_e::NDIlib_frame_format_type_field_1
             }
-            _ => return Err(()),
+            _ => return Err(TryFromVideoFrameError),
         };
 
         let picture_aspect_ratio =
@@ -835,6 +858,17 @@ pub enum AudioFrame<'a> {
     BorrowedRecv(NDIlib_audio_frame_v3_t, &'a RecvInstance),
 }
 
+#[derive(Debug, Copy, Clone)]
+pub struct TryFromAudioBufferError;
+
+impl fmt::Display for TryFromAudioBufferError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Can't handle audio buffer")
+    }
+}
+
+impl std::error::Error for TryFromAudioBufferError {}
+
 impl<'a> AudioFrame<'a> {
     pub fn sample_rate(&self) -> i32 {
         match self {
@@ -1012,13 +1046,15 @@ impl<'a> AudioFrame<'a> {
         info: &gst_audio::AudioInfo,
         buffer: &gst::BufferRef,
         timecode: i64,
-    ) -> Result<Self, ()> {
+    ) -> Result<Self, TryFromAudioBufferError> {
         if info.format() != gst_audio::AUDIO_FORMAT_F32 {
-            return Err(());
+            return Err(TryFromAudioBufferError);
         }
 
-        let map = buffer.map_readable().map_err(|_| ())?;
-        let src_data = map.as_slice_of::<f32>().map_err(|_| ())?;
+        let map = buffer.map_readable().map_err(|_| TryFromAudioBufferError)?;
+        let src_data = map
+            .as_slice_of::<f32>()
+            .map_err(|_| TryFromAudioBufferError)?;
 
         let no_samples = src_data.len() as i32 / info.channels() as i32;
         let channel_stride_or_data_size_in_bytes = no_samples * mem::size_of::<f32>() as i32;

net/ndi/src/ndisinkcombiner/imp.rs

@@ -348,41 +348,41 @@ impl AggregatorImpl for NdiSinkCombiner {
             None => None,
         };
 
-        let audio_buffer_segment_and_pad;
-        if let Some(audio_pad) = self.audio_pad.lock().unwrap().clone() {
-            audio_buffer_segment_and_pad = match audio_pad.peek_buffer() {
-                Some(audio_buffer) if audio_buffer.size() == 0 => {
-                    // Skip empty/gap audio buffer
-                    audio_pad.drop_buffer();
-                    gst_trace!(CAT, obj: agg, "Empty audio buffer, waiting for next");
-                    return Err(gst_base::AGGREGATOR_FLOW_NEED_DATA);
-                }
-                Some(audio_buffer) => {
-                    let audio_segment = audio_pad.segment();
-                    let audio_segment = match audio_segment.downcast::<gst::ClockTime>() {
-                        Ok(audio_segment) => audio_segment,
-                        Err(audio_segment) => {
-                            gst_error!(
-                                CAT,
-                                obj: agg,
-                                "Audio segment of wrong format {:?}",
-                                audio_segment.format()
-                            );
-                            return Err(gst::FlowError::Error);
-                        }
-                    };
+        let audio_buffer_segment_and_pad =
+            if let Some(audio_pad) = self.audio_pad.lock().unwrap().clone() {
+                match audio_pad.peek_buffer() {
+                    Some(audio_buffer) if audio_buffer.size() == 0 => {
+                        // Skip empty/gap audio buffer
+                        audio_pad.drop_buffer();
+                        gst_trace!(CAT, obj: agg, "Empty audio buffer, waiting for next");
+                        return Err(gst_base::AGGREGATOR_FLOW_NEED_DATA);
+                    }
+                    Some(audio_buffer) => {
+                        let audio_segment = audio_pad.segment();
+                        let audio_segment = match audio_segment.downcast::<gst::ClockTime>() {
+                            Ok(audio_segment) => audio_segment,
+                            Err(audio_segment) => {
+                                gst_error!(
+                                    CAT,
+                                    obj: agg,
+                                    "Audio segment of wrong format {:?}",
+                                    audio_segment.format()
+                                );
+                                return Err(gst::FlowError::Error);
+                            }
+                        };
 
-                    Some((audio_buffer, audio_segment, audio_pad))
+                        Some((audio_buffer, audio_segment, audio_pad))
+                    }
+                    None if !audio_pad.is_eos() => {
+                        gst_trace!(CAT, obj: agg, "Waiting for audio buffer");
+                        return Err(gst_base::AGGREGATOR_FLOW_NEED_DATA);
+                    }
+                    None => None,
                 }
-                None if !audio_pad.is_eos() => {
-                    gst_trace!(CAT, obj: agg, "Waiting for audio buffer");
-                    return Err(gst_base::AGGREGATOR_FLOW_NEED_DATA);
-                }
-                None => None,
+            } else {
+                None
             };
-        } else {
-            audio_buffer_segment_and_pad = None;
-        }
 
         let mut state_storage = self.state.lock().unwrap();
         let state = match &mut *state_storage {

net/ndi/src/ndisrcdemux/imp.rs

@@ -124,6 +124,7 @@ impl ElementImpl for NdiSrcDemux {
         PAD_TEMPLATES.as_ref()
     }
 
+    #[allow(clippy::single_match)]
     fn change_state(
         &self,
         element: &Self::Type,
@@ -158,10 +159,13 @@ impl NdiSrcDemux {
     ) -> Result<gst::FlowSuccess, gst::FlowError> {
         gst_log!(CAT, obj: pad, "Handling buffer {:?}", buffer);
 
-        let meta = buffer.make_mut().meta_mut::<ndisrcmeta::NdiSrcMeta>().ok_or_else(|| {
-            gst_error!(CAT, obj: element, "Buffer without NDI source meta");
-            gst::FlowError::Error
-        })?;
+        let meta = buffer
+            .make_mut()
+            .meta_mut::<ndisrcmeta::NdiSrcMeta>()
+            .ok_or_else(|| {
+                gst_error!(CAT, obj: element, "Buffer without NDI source meta");
+                gst::FlowError::Error
+            })?;
 
         let mut events = vec![];
         let srcpad;
@@ -288,11 +292,7 @@ impl NdiSrcDemux {
         state.combiner.update_pad_flow(&srcpad, res)
     }
 
-    fn sink_event(&self,
-        pad: &gst::Pad,
-        element: &super::NdiSrcDemux,
-        event: gst::Event
-    ) -> bool {
+    fn sink_event(&self, pad: &gst::Pad, element: &super::NdiSrcDemux, event: gst::Event) -> bool {
         use gst::EventView;
 
         gst_log!(CAT, obj: pad, "Handling event {:?}", event);
@@ -308,5 +308,4 @@ impl NdiSrcDemux {
         }
         pad.event_default(Some(element), event)
     }
-
 }

net/ndi/src/ndisys.rs

@@ -136,7 +136,7 @@ pub const NDIlib_recv_color_format_ex_compressed_v5: NDIlib_recv_color_format_e
 pub const NDIlib_recv_color_format_ex_compressed_v5_with_audio: NDIlib_recv_color_format_e = 308;
 
 const fn make_fourcc(fourcc: &[u8; 4]) -> u32 {
-    ((fourcc[0] as u32) << 0)
+    (fourcc[0] as u32)
         | ((fourcc[1] as u32) << 8)
         | ((fourcc[2] as u32) << 16)
         | ((fourcc[3] as u32) << 24)

net/ndi/src/receiver.rs

@@ -24,6 +24,7 @@ static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
 pub struct Receiver(Arc<ReceiverInner>);
 
 #[derive(Debug, PartialEq, Eq)]
+#[allow(clippy::large_enum_variant)]
 pub enum AudioInfo {
     AudioInfo(gst_audio::AudioInfo),
     #[cfg(feature = "advanced-sdk")]
@@ -169,12 +170,14 @@ impl VideoInfo {
 }
 
 #[derive(Debug)]
+#[allow(clippy::large_enum_variant)]
 pub enum Buffer {
     Audio(gst::Buffer, AudioInfo),
     Video(gst::Buffer, VideoInfo),
 }
 
 #[derive(Debug)]
+#[allow(clippy::large_enum_variant)]
 pub enum ReceiverItem {
     Buffer(Buffer),
     Flushing,
@@ -564,6 +567,7 @@ impl Receiver {
         }
     }
 
+    #[allow(clippy::too_many_arguments)]
     pub fn connect(
         element: &gst_base::BaseSrc,
         ndi_name: Option<&str>,