[feat] add native Android controller

apps/android/native/controller_protocol.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <minirtc.h>
+#include <nlohmann/json.hpp>
+#include <remote_action.h>
+
+namespace crossdesk::android_controller {
+inline std::string VideoSettingsMessage(int quality, int frame_rate, int preference,
+                                        uint32_t request_id) {
+  RemoteAction action{};
+  action.type = video_settings;
+  action.vs = {quality, frame_rate, preference, request_id, false};
+  return action.to_json();
+}
+
+inline nlohmann::json NetworkReport(const MiniRtcNetTrafficStats& stats, TraversalMode mode) {
+  const auto traffic = [](const MiniRtcInboundStats& in, const MiniRtcOutboundStats& out) {
+    return nlohmann::json{{"inbound", in.bitrate}, {"outbound", out.bitrate}, {"loss", in.loss_rate}};
+  };
+  return {{"rtt", stats.rtt_ms}, {"mode", mode}, {"srtp", stats.srtp_active},
+    {"video", traffic(stats.video_inbound_stats, stats.video_outbound_stats)},
+    {"audio", traffic(stats.audio_inbound_stats, stats.audio_outbound_stats)},
+    {"data", traffic(stats.data_inbound_stats, stats.data_outbound_stats)},
+    {"total", traffic(stats.total_inbound_stats, stats.total_outbound_stats)}};
+}
+}  // namespace crossdesk::android_controller