add video playback attempt

internal/playback/video_attempt.go

@@ -0,0 +1,55 @@
+package playback
+
+import (
+	"context"
+	"errors"
+	"fmt"
+)
+
+type videoSinkError struct {
+	err error
+}
+
+func (e *videoSinkError) Error() string {
+	return fmt.Sprintf("consume video: %v", e.err)
+}
+
+func (e *videoSinkError) Unwrap() error {
+	return e.err
+}
+
+func runVideoAttempt(
+	ctx context.Context,
+	factory VideoReaderFactory,
+	sink VideoSink,
+	config FeedConfig,
+) (resultErr error) {
+	reader, err := factory.OpenVideo(ctx, config)
+	if err != nil {
+		return fmt.Errorf("open video: %w", err)
+	}
+
+	defer func() {
+		if closeErr := reader.Close(); closeErr != nil {
+			closeErr = fmt.Errorf("close video: %w", closeErr)
+			resultErr = errors.Join(resultErr, closeErr)
+		}
+	}()
+
+	for {
+		frame, err := reader.ReadVideo(ctx)
+		if err != nil {
+			if ctx.Err() != nil {
+				return ctx.Err()
+			}
+			return fmt.Errorf("read video: %w", err)
+		}
+
+		if err := sink.ConsumeVideo(ctx, frame); err != nil {
+			if ctx.Err() != nil {
+				return ctx.Err()
+			}
+			return &videoSinkError{err: err}
+		}
+	}
+}