Add /api/ffmpeg for playing files and tts on cameras with two-way audio

internal/ffmpeg/api.go

@@ -0,0 +1,51 @@
+package ffmpeg
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/AlexxIT/go2rtc/internal/streams"
+)
+
+func apiFFmpeg(w http.ResponseWriter, r *http.Request) {
+	if r.Method != "POST" {
+		http.Error(w, "", http.StatusMethodNotAllowed)
+		return
+	}
+
+	query := r.URL.Query()
+	dst := query.Get("dst")
+	stream := streams.Get(dst)
+	if stream == nil {
+		http.Error(w, "", http.StatusNotFound)
+		return
+	}
+
+	var src string
+	if s := query.Get("file"); s != "" {
+		if streams.Validate(s) == nil {
+			src = "ffmpeg:" + s + "#audio=auto#input=file"
+		}
+	} else if s = query.Get("live"); s != "" {
+		if streams.Validate(s) == nil {
+			src = "ffmpeg:" + s + "#audio=auto"
+		}
+	} else if s = query.Get("text"); s != "" {
+		if strings.IndexAny(s, `'"&%$`) < 0 {
+			src = "ffmpeg:tts?text=" + s
+			if s = query.Get("voice"); s != "" {
+				src += "&voice=" + s
+			}
+			src += "#audio=auto"
+		}
+	}
+
+	if src == "" {
+		http.Error(w, "", http.StatusBadRequest)
+		return
+	}
+
+	if err := stream.Play(src); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+}