初始提交：短剧库源码（含转码优化 ultrafast）

internal/app/playback_activity.go

@@ -0,0 +1,30 @@
+package app
+
+import (
+	"net/http"
+	"time"
+)
+
+type playbackActivityWriter struct {
+	http.ResponseWriter
+	app       *UIApp
+	run       *playbackRunContext
+	nextTouch time.Time
+}
+
+func (writer *playbackActivityWriter) Unwrap() http.ResponseWriter {
+	return writer.ResponseWriter
+}
+
+func (writer *playbackActivityWriter) Write(data []byte) (int, error) {
+	count, err := writer.ResponseWriter.Write(data)
+	if count > 0 && err == nil && time.Now().After(writer.nextTouch) {
+		writer.app.playbackMu.Lock()
+		if session := writer.app.playbacks[writer.run.id]; session == writer.run.session && session.run == writer.run.run && writer.run.ctx.Err() == nil {
+			writer.app.touchPlaybackLocked(session)
+		}
+		writer.app.playbackMu.Unlock()
+		writer.nextTouch = time.Now().Add(20 * time.Second)
+	}
+	return count, err
+}