dropped-frame tracke

internal/playback/video.go

@@ -2,6 +2,17 @@ package playback
 
 import "context"
 
+type videoSourceContextKey struct{}
+
+func withVideoSource(ctx context.Context, source FeedConfig) context.Context {
+	return context.WithValue(ctx, videoSourceContextKey{}, source)
+}
+
+func videoSourceFromContext(ctx context.Context) FeedConfig {
+	source, _ := ctx.Value(videoSourceContextKey{}).(FeedConfig)
+	return source
+}
+
 // VideoFrame contains metadata and borrowed source payload.
 //
 // Payload is valid only until the next VideoReader.ReadVideo call or until the