Implement Error for error types (#1)

Cargo.toml

@@ -15,3 +15,4 @@ gstreamer = "0.16.2"
 gstreamer-app = "0.16.0"
 gstreamer-video = "0.16.0"
 log = "0.4"
+thiserror = "1"

src/file.rs

@@ -38,13 +38,8 @@ impl IntoIterator for FileSource {
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, thiserror::Error)]
 pub enum CaptureError {
-    IoError(io::Error),
-}
-
-impl From<io::Error> for CaptureError {
-    fn from(err: io::Error) -> Self {
-        CaptureError::IoError(err)
-    }
+    #[error("IO error: {0}")]
+    IoError(#[from] io::Error),
 }

src/video_stream.rs

@@ -33,9 +33,11 @@ pub struct GstErrorMessage {
     pub source: glib::Error,
 }
 
-#[derive(Debug)]
+#[derive(Debug, thiserror::Error)]
 pub enum StreamError {
+    #[error("GST error: {0:?}")]
     GstError(GstErrorMessage),
+    #[error("frame capture error")]
     FrameCaptureError,
 }