first commit

handlers/analyze.go

@@ -0,0 +1,81 @@
+package handlers
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"os"
+	"path/filepath"
+
+	"aroll/store"
+	"aroll/transcode"
+	"aroll/ws"
+)
+
+type analyzeRequest struct {
+	Filename   string  `json:"filename"`
+	NoiseDb    float64 `json:"noiseDb"`
+	MinSilence float64 `json:"minSilence"`
+	Padding    float64 `json:"padding"`
+}
+
+// AnalyzeHandler fetches the video bytes from Redis, writes them to a short-lived
+// temp file for FFmpeg, runs silence detection, then deletes the temp file.
+func AnalyzeHandler(st *store.Store, hub *ws.Hub) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPost {
+			http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
+			return
+		}
+
+		var req analyzeRequest
+		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+			http.Error(w, "bad JSON: "+err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		data, err := st.Get(context.Background(), req.Filename)
+		if err != nil {
+			http.Error(w, "file not found in store (may have expired)", http.StatusNotFound)
+			return
+		}
+
+		ext := filepath.Ext(req.Filename)
+
+		go func() {
+			// Write to a temp file — FFmpeg needs a file path, not a byte slice.
+			// This file exists only for the duration of the FFmpeg scan.
+			tmp, err := os.CreateTemp("", "aroll-analyze-*"+ext)
+			if err != nil {
+				broadcastError(hub, "create temp: "+err.Error())
+				return
+			}
+			defer os.Remove(tmp.Name())
+
+			if _, err := tmp.Write(data); err != nil {
+				tmp.Close()
+				broadcastError(hub, "write temp: "+err.Error())
+				return
+			}
+			tmp.Close()
+
+			_, err = transcode.DetectSpeechSegments(
+				tmp.Name(),
+				req.NoiseDb,
+				req.MinSilence,
+				req.Padding,
+				hub.Broadcast,
+			)
+			if err != nil {
+				broadcastError(hub, err.Error())
+			}
+		}()
+
+		w.WriteHeader(http.StatusAccepted)
+	}
+}
+
+func broadcastError(hub *ws.Hub, msg string) {
+	data, _ := json.Marshal(map[string]string{"type": "error", "message": msg})
+	hub.Broadcast(data)
+}