nokhwa-iter helper crate

nokhwa-core/src/error.rs

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-use crate::frame_format::FrameFormat;
+use crate::frame_format::{CustomFrameFormat, FrameFormat};
 use std::fmt::Debug;
 use thiserror::Error;
 use crate::types::Backends;
@@ -66,6 +66,8 @@ pub enum NokhwaError {
     Decoder(String),
     #[error("Unsupported FrameFormat: {0}")]
     DecoderUnsupportedFrameFormat(FrameFormat),
+    #[error("The destination frame format from {0} to {1} is not supported.")]
+    DecoderUnsupportedCustomFrameFormatDestination(CustomFrameFormat, FrameFormat),
     #[error("Unsupported pixel configuration {0} with width {1}b.")]
     DecoderUnsupportedDestinationPixelFormat(&'static str, u32),
     #[error("Bad decoder configuration: {0}")]
@@ -79,7 +81,7 @@ pub enum NokhwaError {
     #[error("You need to pass in a destination hint, it is not optional for this decoder.")]
     DecoderDestinationHintRequired,
     #[error("Decoder already deinitialized. Unusable, please make a new decoder.")]
-    DecoderAlreadyDeinitialized
+    DecoderAlreadyDeinitialized,
 }
 //
 // pub enum InitializeError {}

nokhwa-core/src/frame_format.rs

@@ -205,13 +205,22 @@ define_frame_format_with_groups! {
     ]
 }
 
+impl FrameFormat {
+    pub fn is_custom(&self) -> bool {
+        if let FrameFormat::Custom(_) = self {
+            return true
+        }
+        false
+    }
+}
+
 impl Display for FrameFormat {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         write!(f, "{self:?}")
     }
 }
 
-#[derive(Copy, Clone, Debug, Hash, PartialOrd, PartialEq)]
+#[derive(Copy, Clone, Debug, Hash, Ord, PartialOrd, Eq, PartialEq)]
 #[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub enum CustomFrameFormat {
     UUID(u128),
@@ -222,6 +231,12 @@ pub enum CustomFrameFormat {
     F64(OrderedFloat<f64>),
 }
 
+impl Display for CustomFrameFormat {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{self:?}")
+    }
+}
+
 #[macro_export]
 macro_rules! define_back_and_fourth_frame_format {
     ($fourcc_type:ty, { $( $frame_format:expr => $value:literal, )* }, $func_u8_8_to_fcc:expr, $func_fcc_to_u8_8:expr, $value_to_fcc_type:expr) => {