Add multi-resolution playback support

backend/internal/api/room.go

@@ -48,3 +48,18 @@ func GetActiveRooms(c *gin.Context) {
 
 	c.JSON(http.StatusOK, gin.H{"active_rooms": result})
 }
+
+func GetRoomPlaybackOptions(c *gin.Context) {
+	roomID := c.Param("room_id")
+	qualities := []string{"source"}
+	if adminRTMP != nil {
+		if available := adminRTMP.AvailablePlaybackQualities(roomID); len(available) > 0 {
+			qualities = available
+		}
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"room_id":   roomID,
+		"qualities": qualities,
+	})
+}

backend/internal/api/router.go

@@ -37,6 +37,7 @@ func SetupRouter(streamServer *stream.RTMPServer) *gin.Engine {
 	authGroup.Use(AuthMiddleware())
 	{
 		authGroup.GET("/room/my", GetMyRoom)
+		authGroup.GET("/rooms/:room_id/playback-options", GetRoomPlaybackOptions)
 		authGroup.POST("/user/change-password", ChangePassword)
 
 		adminGroup := authGroup.Group("/admin")

backend/internal/stream/server.go

@@ -1,11 +1,16 @@
 package stream
 
 import (
+	"context"
+	"crypto/rand"
+	"encoding/hex"
 	"fmt"
 	"io"
 	"net/http"
+	"os/exec"
 	"strings"
 	"sync"
+	"time"
 
 	"github.com/gin-gonic/gin"
 	"github.com/nareix/joy4/av/avutil"
@@ -27,9 +32,38 @@ func init() {
 
 // RTMPServer manages all active live streams
 type RTMPServer struct {
-	server   *rtmp.Server
+	server             *rtmp.Server
-	channels map[string]*pubsub.Queue
+	channels           map[string]*pubsub.Queue
-	mutex    sync.RWMutex
+	transcoders        map[string][]*variantTranscoder
+	internalPublishKey string
+	mutex              sync.RWMutex
+}
+
+type variantTranscoder struct {
+	quality string
+	cancel  context.CancelFunc
+	cmd     *exec.Cmd
+}
+
+type qualityProfile struct {
+	scale        string
+	videoBitrate string
+	audioBitrate string
+}
+
+var qualityOrder = []string{"source", "720p", "480p"}
+
+var supportedQualities = map[string]qualityProfile{
+	"720p": {
+		scale:        "1280:-2",
+		videoBitrate: "2500k",
+		audioBitrate: "128k",
+	},
+	"480p": {
+		scale:        "854:-2",
+		videoBitrate: "1200k",
+		audioBitrate: "96k",
+	},
 }
 
 type writeFlusher struct {
@@ -45,32 +79,29 @@ func (w writeFlusher) Flush() error {
 // NewRTMPServer creates and initializes a new media server
 func NewRTMPServer() *RTMPServer {
 	s := &RTMPServer{
-		channels: make(map[string]*pubsub.Queue),
+		channels:           make(map[string]*pubsub.Queue),
-		server:   &rtmp.Server{},
+		transcoders:        make(map[string][]*variantTranscoder),
+		internalPublishKey: generateInternalPublishKey(),
+		server:             &rtmp.Server{},
 	}
 
 	// Triggered when a broadcaster (e.g., OBS) starts publishing
 	s.server.HandlePublish = func(conn *rtmp.Conn) {
-		streamPath := conn.URL.Path // Expected format: /live/{stream_key}
+		streamPath := conn.URL.Path // Expected format: /live/{stream_key} or /variant/{room_id}/{quality}/{token}
 		monitor.Infof("OBS publish attempt: %s", streamPath)
 
-		// Extract stream key from path
 		parts := strings.Split(streamPath, "/")
-		if len(parts) < 3 || parts[1] != "live" {
+		if len(parts) < 3 {
 			monitor.Warnf("Invalid publish path format: %s", streamPath)
 			return
 		}
-		streamKey := parts[2]
 
-		// Authenticate stream key
+		roomID, channelPath, isSource, ok := s.resolvePublishPath(parts)
-		var room model.Room
+		if !ok {
-		if err := db.DB.Where("stream_key = ?", streamKey).First(&room).Error; err != nil {
+			monitor.Warnf("Invalid publish key/path: %s", streamPath)
-			monitor.Warnf("Invalid stream key: %s", streamKey)
+			return
-			return // Reject connection
 		}
 
-		monitor.Infof("Stream authenticated for room_id=%d", room.ID)
-
 		// 1. Get audio/video stream metadata
 		streams, err := conn.Streams()
 		if err != nil {
@@ -78,31 +109,40 @@ func NewRTMPServer() *RTMPServer {
 			return
 		}
 
-		// 2. Map the active stream by Room ID so viewers can use /live/{room_id}
+		monitor.Infof("Stream authenticated for room_id=%s path=%s", roomID, channelPath)
-		roomLivePath := fmt.Sprintf("/live/%d", room.ID)
+
-		
 		s.mutex.Lock()
 		q := pubsub.NewQueue()
 		q.WriteHeader(streams)
-		s.channels[roomLivePath] = q
+		s.channels[channelPath] = q
 		s.mutex.Unlock()
 
-		// Mark room as active in DB (using map to ensure true/false is correctly updated)
+		if isSource {
-		db.DB.Model(&room).Updates(map[string]interface{}{"is_active": true})
+			roomIDUint := parseRoomID(roomID)
+			if roomIDUint != 0 {
+				db.DB.Model(&model.Room{}).Where("id = ?", roomIDUint).Updates(map[string]interface{}{"is_active": true})
+			}
+			s.startVariantTranscoders(roomID)
+		}
 
 		// 3. Cleanup on end
 		defer func() {
 			s.mutex.Lock()
-			delete(s.channels, roomLivePath)
+			delete(s.channels, channelPath)
 			s.mutex.Unlock()
 			q.Close()
-			// Explicitly set is_active to false using map
+
-			db.DB.Model(&room).Updates(map[string]interface{}{"is_active": false})
+			if isSource {
-			
+				s.stopVariantTranscoders(roomID)
-			// Clear chat history for this room
+				roomIDUint := parseRoomID(roomID)
-			chat.MainHub.ClearRoomHistory(fmt.Sprintf("%d", room.ID))
+				if roomIDUint != 0 {
-			
+					db.DB.Model(&model.Room{}).Where("id = ?", roomIDUint).Updates(map[string]interface{}{"is_active": false})
-			monitor.Infof("Publishing ended for room_id=%d", room.ID)
+				}
+				chat.MainHub.ClearRoomHistory(roomID)
+				monitor.Infof("Publishing ended for room_id=%s", roomID)
+			} else {
+				monitor.Infof("Variant publishing ended for room_id=%s path=%s", roomID, channelPath)
+			}
 		}()
 
 		// 4. Continuously copy data packets to our broadcast queue
@@ -158,6 +198,9 @@ func (s *RTMPServer) Start(addr string) error {
 // HandleHTTPFLV serves browser-compatible HTTP-FLV playback for web clients.
 func (s *RTMPServer) HandleHTTPFLV(c *gin.Context) {
 	streamPath := fmt.Sprintf("/live/%s", c.Param("room_id"))
+	if quality := normalizeQuality(c.Query("quality")); quality != "" {
+		streamPath = fmt.Sprintf("%s/%s", streamPath, quality)
+	}
 
 	s.mutex.RLock()
 	q, ok := s.channels[streamPath]
@@ -198,10 +241,149 @@ func (s *RTMPServer) HandleHTTPFLV(c *gin.Context) {
 	}
 }
 
+func (s *RTMPServer) resolvePublishPath(parts []string) (roomID string, channelPath string, isSource bool, ok bool) {
+	if parts[1] == "live" && len(parts) == 3 {
+		var room model.Room
+		if err := db.DB.Where("stream_key = ?", parts[2]).First(&room).Error; err != nil {
+			return "", "", false, false
+		}
+		roomID = fmt.Sprintf("%d", room.ID)
+		channelPath = fmt.Sprintf("/live/%s", roomID)
+		return roomID, channelPath, true, true
+	}
+
+	if parts[1] == "variant" && len(parts) == 5 {
+		roomID = parts[2]
+		quality := normalizeQuality(parts[3])
+		token := parts[4]
+		if quality == "" || token != s.internalPublishKey {
+			return "", "", false, false
+		}
+		return roomID, fmt.Sprintf("/live/%s/%s", roomID, quality), false, true
+	}
+
+	return "", "", false, false
+}
+
+func (s *RTMPServer) startVariantTranscoders(roomID string) {
+	s.stopVariantTranscoders(roomID)
+
+	launch := make([]*variantTranscoder, 0, len(supportedQualities))
+	for quality, profile := range supportedQualities {
+		ctx, cancel := context.WithCancel(context.Background())
+		inputURL := fmt.Sprintf("rtmp://127.0.0.1:1935/live/%s", roomID)
+		outputURL := fmt.Sprintf("rtmp://127.0.0.1:1935/variant/%s/%s/%s", roomID, quality, s.internalPublishKey)
+		cmd := exec.CommandContext(
+			ctx,
+			"ffmpeg",
+			"-nostdin",
+			"-loglevel", "error",
+			"-i", inputURL,
+			"-vf", "scale="+profile.scale+":force_original_aspect_ratio=decrease",
+			"-c:v", "libx264",
+			"-preset", "veryfast",
+			"-tune", "zerolatency",
+			"-g", "48",
+			"-keyint_min", "48",
+			"-sc_threshold", "0",
+			"-b:v", profile.videoBitrate,
+			"-maxrate", profile.videoBitrate,
+			"-bufsize", profile.videoBitrate,
+			"-c:a", "aac",
+			"-b:a", profile.audioBitrate,
+			"-ar", "44100",
+			"-ac", "2",
+			"-f", "flv",
+			outputURL,
+		)
+
+		transcoder := &variantTranscoder{
+			quality: quality,
+			cancel:  cancel,
+			cmd:     cmd,
+		}
+		launch = append(launch, transcoder)
+
+		go func(roomID string, tr *variantTranscoder) {
+			time.Sleep(2 * time.Second)
+			monitor.Infof("Starting transcoder room_id=%s quality=%s", roomID, tr.quality)
+			if err := tr.cmd.Start(); err != nil {
+				monitor.Errorf("Failed to start transcoder room_id=%s quality=%s: %v", roomID, tr.quality, err)
+				return
+			}
+			if err := tr.cmd.Wait(); err != nil && ctx.Err() == nil {
+				monitor.Warnf("Transcoder exited room_id=%s quality=%s: %v", roomID, tr.quality, err)
+			}
+		}(roomID, transcoder)
+	}
+
+	s.mutex.Lock()
+	s.transcoders[roomID] = launch
+	s.mutex.Unlock()
+}
+
+func (s *RTMPServer) stopVariantTranscoders(roomID string) {
+	s.mutex.Lock()
+	transcoders := s.transcoders[roomID]
+	delete(s.transcoders, roomID)
+	s.mutex.Unlock()
+
+	for _, transcoder := range transcoders {
+		transcoder.cancel()
+	}
+}
+
+func normalizeQuality(value string) string {
+	value = strings.ToLower(strings.TrimSpace(value))
+	if _, ok := supportedQualities[value]; ok {
+		return value
+	}
+	return ""
+}
+
+func parseRoomID(value string) uint {
+	var roomID uint
+	_, _ = fmt.Sscanf(value, "%d", &roomID)
+	return roomID
+}
+
+func generateInternalPublishKey() string {
+	buf := make([]byte, 16)
+	if _, err := rand.Read(buf); err != nil {
+		return "internal_publish_fallback_key"
+	}
+	return hex.EncodeToString(buf)
+}
+
 func (s *RTMPServer) ActiveStreamCount() int {
 	s.mutex.RLock()
 	defer s.mutex.RUnlock()
-	return len(s.channels)
+
+	count := 0
+	for path := range s.channels {
+		if strings.Count(path, "/") == 2 {
+			count++
+		}
+	}
+	return count
+}
+
+func (s *RTMPServer) AvailablePlaybackQualities(roomID string) []string {
+	s.mutex.RLock()
+	defer s.mutex.RUnlock()
+
+	basePath := fmt.Sprintf("/live/%s", roomID)
+	available := make([]string, 0, len(qualityOrder))
+	for _, quality := range qualityOrder {
+		streamPath := basePath
+		if quality != "source" {
+			streamPath = fmt.Sprintf("%s/%s", basePath, quality)
+		}
+		if _, ok := s.channels[streamPath]; ok {
+			available = append(available, quality)
+		}
+	}
+	return available
 }
 
 func (s *RTMPServer) ActiveStreamPaths() []string {
@@ -210,7 +392,9 @@ func (s *RTMPServer) ActiveStreamPaths() []string {
 
 	paths := make([]string, 0, len(s.channels))
 	for path := range s.channels {
-		paths = append(paths, path)
+		if strings.Count(path, "/") == 2 {
+			paths = append(paths, path)
+		}
 	}
 	return paths
 }

frontend/lib/pages/player_page.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:convert';
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
@@ -8,6 +9,7 @@ import 'package:video_player/video_player.dart';
 
 import '../providers/auth_provider.dart';
 import '../providers/settings_provider.dart';
+import '../services/api_service.dart';
 import '../services/chat_service.dart';
 import '../widgets/web_stream_player.dart';
 
@@ -24,7 +26,7 @@ class PlayerPage extends StatefulWidget {
   });
 
   @override
-  _PlayerPageState createState() => _PlayerPageState();
+  State<PlayerPage> createState() => _PlayerPageState();
 }
 
 class _PlayerPageState extends State<PlayerPage> {
@@ -42,11 +44,13 @@ class _PlayerPageState extends State<PlayerPage> {
   bool _controlsVisible = true;
   int _playerVersion = 0;
   String _selectedResolution = 'Source';
+  List<String> _availableResolutions = const ['Source'];
   Timer? _controlsHideTimer;
 
   @override
   void initState() {
     super.initState();
+    _loadPlaybackOptions();
     if (!kIsWeb) {
       _initializePlayer();
     }
@@ -55,9 +59,8 @@ class _PlayerPageState extends State<PlayerPage> {
   }
 
   Future<void> _initializePlayer() async {
-    _controller = VideoPlayerController.networkUrl(
+    final playbackUrl = _currentPlaybackUrl();
-      Uri.parse(widget.playbackUrl),
+    _controller = VideoPlayerController.networkUrl(Uri.parse(playbackUrl));
-    );
     try {
       await _controller!.initialize();
       _controller!.play();
@@ -81,6 +84,55 @@ class _PlayerPageState extends State<PlayerPage> {
     }
   }
 
+  String _currentPlaybackUrl() {
+    final settings = context.read<SettingsProvider>();
+    final quality = _selectedResolution == 'Source'
+        ? null
+        : _selectedResolution.toLowerCase();
+    return settings.playbackUrl(widget.roomId, quality: quality);
+  }
+
+  Future<void> _loadPlaybackOptions() async {
+    final settings = context.read<SettingsProvider>();
+    final auth = context.read<AuthProvider>();
+    final api = ApiService(settings, auth.token);
+
+    try {
+      final response = await api.getPlaybackOptions(widget.roomId);
+      if (response.statusCode != 200) {
+        return;
+      }
+
+      final data = jsonDecode(response.body) as Map<String, dynamic>;
+      final rawQualities =
+          (data['qualities'] as List<dynamic>? ?? const ['source'])
+              .map((item) => item.toString().trim().toLowerCase())
+              .where((item) => item.isNotEmpty)
+              .toList();
+
+      final normalized = <String>['Source'];
+      for (final quality in rawQualities) {
+        if (quality == 'source') {
+          continue;
+        }
+        normalized.add(quality);
+      }
+
+      if (!mounted) {
+        return;
+      }
+
+      setState(() {
+        _availableResolutions = normalized.toSet().toList();
+        if (!_availableResolutions.contains(_selectedResolution)) {
+          _selectedResolution = 'Source';
+        }
+      });
+    } catch (_) {
+      // Keep source-only playback when the capability probe fails.
+    }
+  }
+
   void _initializeChat() {
     final settings = context.read<SettingsProvider>();
     final auth = context.read<AuthProvider>();
@@ -141,6 +193,8 @@ class _PlayerPageState extends State<PlayerPage> {
       return;
     }
 
+    await _loadPlaybackOptions();
+
     setState(() {
       _isRefreshing = true;
       _isError = false;
@@ -223,22 +277,30 @@ class _PlayerPageState extends State<PlayerPage> {
 
   Future<void> _selectResolution() async {
     _showControls();
+    await _loadPlaybackOptions();
+    if (!mounted) {
+      return;
+    }
+
     final nextResolution = await showModalBottomSheet<String>(
       context: context,
       builder: (context) {
         const options = ['Source', '720p', '480p'];
+        final available = _availableResolutions.toSet();
         return SafeArea(
           child: Column(
             mainAxisSize: MainAxisSize.min,
             children: [
-              const ListTile(
+              ListTile(
                 title: Text('Playback Resolution'),
                 subtitle: Text(
-                  'Current backend only provides the source stream. Lower resolutions are reserved for future multi-bitrate output.',
+                  available.length > 1
+                      ? 'Select an available transcoded stream.'
+                      : 'Only the source stream is available right now.',
                 ),
               ),
               ...options.map((option) {
-                final enabled = option == 'Source';
+                final enabled = available.contains(option);
                 return ListTile(
                   enabled: enabled,
                   leading: Icon(
@@ -249,7 +311,7 @@ class _PlayerPageState extends State<PlayerPage> {
                   title: Text(option),
                   subtitle: enabled
                       ? const Text('Available now')
-                      : const Text('Requires backend transcoding support'),
+                      : const Text('Waiting for backend transcoding output'),
                   onTap: enabled ? () => Navigator.pop(context, option) : null,
                 );
               }),
@@ -376,7 +438,7 @@ class _PlayerPageState extends State<PlayerPage> {
                   : kIsWeb
                   ? WebStreamPlayer(
                       key: ValueKey('web-player-$_playerVersion'),
-                      streamUrl: widget.playbackUrl,
+                      streamUrl: _currentPlaybackUrl(),
                     )
                   : _controller != null && _controller!.value.isInitialized
                   ? AspectRatio(

frontend/lib/pages/settings_page.dart

@@ -307,11 +307,11 @@ class _SettingsPageState extends State<SettingsPage> {
                     style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
                   ),
                   Text(
-                    "Version: 1.0.0-beta3.5",
+                    "Version: 1.0.0-beta4.1",
                     style: TextStyle(color: Colors.grey),
                   ),
                   Text(
-                    "Author: Highground-Soft & Minimax",
+                    "Author: Highground-Soft",
                     style: TextStyle(color: Colors.grey),
                   ),
                   SizedBox(height: 20),

frontend/lib/providers/settings_provider.dart

@@ -62,12 +62,26 @@ class SettingsProvider with ChangeNotifier {
     return "rtmp://${uri.host}:1935/live";
   }
 
-  String playbackUrl(String roomId) {
+  String playbackUrl(String roomId, {String? quality}) {
     final uri = Uri.parse(_baseUrl);
+    final normalizedQuality = quality?.trim().toLowerCase();
+
     if (kIsWeb) {
-      return uri.replace(path: '/live/$roomId').toString();
+      return uri
+          .replace(
+            path: '/live/$roomId',
+            queryParameters:
+                normalizedQuality == null || normalizedQuality.isEmpty
+                ? null
+                : {'quality': normalizedQuality},
+          )
+          .toString();
     }
-    return "$rtmpUrl/$roomId";
+
+    if (normalizedQuality == null || normalizedQuality.isEmpty) {
+      return "$rtmpUrl/$roomId";
+    }
+    return "$rtmpUrl/$roomId/$normalizedQuality";
   }
 
   ThemeMode _themeModeFromString(String value) {

frontend/lib/services/api_service.dart

@@ -43,11 +43,24 @@ class ApiService {
     );
   }
 
-  Future<http.Response> changePassword(String oldPassword, String newPassword) async {
+  Future<http.Response> getPlaybackOptions(String roomId) async {
+    return await http.get(
+      Uri.parse("${settings.baseUrl}/api/rooms/$roomId/playback-options"),
+      headers: _headers,
+    );
+  }
+
+  Future<http.Response> changePassword(
+    String oldPassword,
+    String newPassword,
+  ) async {
     return await http.post(
       Uri.parse("${settings.baseUrl}/api/user/change-password"),
       headers: _headers,
-      body: jsonEncode({"old_password": oldPassword, "new_password": newPassword}),
+      body: jsonEncode({
+        "old_password": oldPassword,
+        "new_password": newPassword,
+      }),
     );
   }
 }