feat: add broadcast event for player count change (#3562)

conf/config.ini

@@ -126,6 +126,8 @@ wait_track_ready_ms=10000
 wait_add_track_ms=3000
 #如果track未就绪，我们先缓存帧数据，但是有最大个数限制，防止内存溢出
 unready_frame_cache=100
+#是否启用观看人数变化事件广播，置1则启用，置0则关闭
+broadcast_player_count_changed=0
 
 [hls]
 #hls写文件的buf大小，调整参数可以提高文件io性能

src/Common/MediaSource.cpp

@@ -652,6 +652,10 @@ MediaSource::Ptr MediaSource::createFromMP4(const string &schema, const string &
 /////////////////////////////////////MediaSourceEvent//////////////////////////////////////
 
 void MediaSourceEvent::onReaderChanged(MediaSource &sender, int size){
+    GET_CONFIG(bool, enable, General::kBroadcastPlayerCountChanged);
+    if (enable) {
+        NOTICE_EMIT(BroadcastPlayerCountChangedArgs, Broadcast::kBroadcastPlayerCountChanged, sender.getMediaTuple(), sender.totalReaderCount());
+    }
     if (size || sender.totalReaderCount()) {
         //还有人观看该视频，不触发关闭事件
         _async_close_timer = nullptr;

src/Common/config.cpp

@@ -64,6 +64,7 @@ const string kBroadcastRtcSctpFailed = "kBroadcastRtcSctpFailed";
 const string kBroadcastRtcSctpClosed = "kBroadcastRtcSctpClosed";
 const string kBroadcastRtcSctpSend = "kBroadcastRtcSctpSend";
 const string kBroadcastRtcSctpReceived = "kBroadcastRtcSctpReceived";
+const string kBroadcastPlayerCountChanged = "kBroadcastPlayerCountChanged";
 
 } // namespace Broadcast
 
@@ -82,6 +83,7 @@ const string kEnableFFmpegLog = GENERAL_FIELD "enable_ffmpeg_log";
 const string kWaitTrackReadyMS = GENERAL_FIELD "wait_track_ready_ms";
 const string kWaitAddTrackMS = GENERAL_FIELD "wait_add_track_ms";
 const string kUnreadyFrameCache = GENERAL_FIELD "unready_frame_cache";
+const string kBroadcastPlayerCountChanged = GENERAL_FIELD "broadcast_player_count_changed";
 
 static onceToken token([]() {
     mINI::Instance()[kFlowThreshold] = 1024;
@@ -96,6 +98,7 @@ static onceToken token([]() {
     mINI::Instance()[kWaitTrackReadyMS] = 10000;
     mINI::Instance()[kWaitAddTrackMS] = 3000;
     mINI::Instance()[kUnreadyFrameCache] = 100;
+    mINI::Instance()[kBroadcastPlayerCountChanged] = 0;
 });
 
 } // namespace General

src/Common/config.h

@@ -124,6 +124,10 @@ extern const std::string kBroadcastRtcSctpSend;
 extern const std::string kBroadcastRtcSctpReceived;
 #define BroadcastRtcSctpReceivedArgs WebRtcTransport& sender, uint16_t &streamId, uint32_t &ppid, const uint8_t *&msg, size_t &len
 
+// 观看人数变化广播
+extern const std::string kBroadcastPlayerCountChanged;
+#define BroadcastPlayerCountChangedArgs const MediaTuple& args, const int& count
+
 #define ReloadConfigTag ((void *)(0xFF))
 #define RELOAD_KEY(arg, key)                                                                                           \
     do {                                                                                                               \
@@ -196,6 +200,8 @@ extern const std::string kWaitTrackReadyMS;
 extern const std::string kWaitAddTrackMS;
 // 如果track未就绪，我们先缓存帧数据，但是有最大个数限制(100帧时大约4秒)，防止内存溢出
 extern const std::string kUnreadyFrameCache;
+// 是否启用观看人数变化事件广播，置1则启用，置0则关闭
+extern const std::string kBroadcastPlayerCountChanged;
 } // namespace General
 
 namespace Protocol {