Adds support local USB cameras

cmd/ffmpeg/devices.go

@@ -0,0 +1,73 @@
+package ffmpeg
+
+import (
+	"encoding/json"
+	"github.com/AlexxIT/go2rtc/pkg/streamer"
+	"github.com/rs/zerolog/log"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+)
+
+func getDevice(src string) (string, error) {
+	if medias == nil {
+		loadMedias()
+	}
+
+	input := deviceInputPrefix
+
+	var videoIdx, audioIdx int
+	if i := strings.IndexByte(src, '?'); i > 0 {
+		query, err := url.ParseQuery(src[i+1:])
+		if err != nil {
+			return "", err
+		}
+		for key, value := range query {
+			switch key {
+			case "video":
+				videoIdx, _ = strconv.Atoi(value[0])
+			case "audio":
+				audioIdx, _ = strconv.Atoi(value[0])
+			case "framerate":
+				input += " -framerate " + value[0]
+			case "resolution":
+				input += " -video_size " + value[0]
+			}
+		}
+	}
+
+	input += " -i " + deviceInputSuffix(videoIdx, audioIdx)
+
+	return input, nil
+}
+
+var medias []*streamer.Media
+
+func findMedia(kind string, index int) *streamer.Media {
+	for _, media := range medias {
+		if media.Kind != kind {
+			continue
+		}
+		if index == 0 {
+			return media
+		}
+		index--
+	}
+	return nil
+}
+
+func handleDevices(w http.ResponseWriter, r *http.Request) {
+	if medias == nil {
+		loadMedias()
+	}
+
+	data, err := json.Marshal(medias)
+	if err != nil {
+		log.Error().Err(err).Msg("[api.ffmpeg]")
+		return
+	}
+	if _, err = w.Write(data); err != nil {
+		log.Error().Err(err).Msg("[api.ffmpeg]")
+	}
+}