彻底解决mp4_as_player设置为1时，on_stream_none_reader回调无效流信息的问题 (#4725)

src/Common/MediaSource.cpp

@@ -66,11 +66,6 @@ ProtocolOption::ProtocolOption() {
 
 //////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
-struct MediaSourceNull : public MediaSource {
-    MediaSourceNull() : MediaSource("schema", MediaTuple{"vhost", "app", "stream", ""}) {};
-    int readerCount() override { return 0; }
-};
-
 MediaSource &MediaSource::NullMediaSource() {
     static std::shared_ptr<MediaSource> s_null = std::make_shared<MediaSourceNull>();
     return *s_null;

src/Common/MediaSource.h

@@ -573,5 +573,11 @@ private:
     toolkit::ObjectStatistic<MediaSource> _statistic;
 };
 
+struct MediaSourceNull : public MediaSource {
+    MediaSourceNull(const MediaTuple &tuple = { "vhost", "app", "stream", "" })
+        : MediaSource("schema", tuple) { };
+    int readerCount() override { return 0; }
+};
+
 } /* namespace mediakit */
 #endif //ZLMEDIAKIT_MEDIASOURCE_H

src/Common/MultiMediaSourceMuxer.cpp

@@ -206,6 +206,7 @@ void MultiMediaSourceMuxer::forEachRtpSender(const std::function<void(const std:
 }
 #endif // ENABLE_RTPPROXY
 MultiMediaSourceMuxer::MultiMediaSourceMuxer(const MediaTuple& tuple, float dur_sec, const ProtocolOption &option): _tuple(tuple) {
+    _null_src = std::make_shared<MediaSourceNull>(tuple);
     if (!option.stream_replace.empty()) {
         // 支持在on_publish hook中替换stream_id  [AUTO-TRANSLATED:375eb2ff]
         // Support replacing stream_id in on_publish hook
@@ -319,7 +320,7 @@ bool MultiMediaSourceMuxer::setupRecord(Recorder::type type, bool start, const s
         if (_option.mp4_as_player && type == Recorder::type_mp4) {
             // 开启关闭mp4录制，触发观看人数变化相关事件  [AUTO-TRANSLATED:b63a8deb]
             // Turn on/off mp4 recording, trigger events related to changes in the number of viewers
-            onReaderChanged(*getAnyMediaSource(), totalReaderCount());
+            onReaderChanged(*_null_src, totalReaderCount());
         }
     });
     switch (type) {
@@ -908,24 +909,6 @@ bool MultiMediaSourceMuxer::onTrackFrame_l(const Frame::Ptr &frame_in) {
     return ret;
 }
 
-#define TRY_SRC(muxer) \
-    if (muxer) { \
-        auto src = muxer->getMediaSource(); \
-        if (src) { \
-            return src; \
-        } \
-    }
-
-MediaSource::Ptr MultiMediaSourceMuxer::getAnyMediaSource() const {
-    TRY_SRC(_fmp4)
-    TRY_SRC(_rtmp)
-    TRY_SRC(_rtsp)
-    TRY_SRC(_ts)
-    TRY_SRC(_hls)
-    TRY_SRC(_hls_fmp4)
-    return MediaSource::NullMediaSource().shared_from_this();
-}
-
 bool MultiMediaSourceMuxer::isEnabled(){
     GET_CONFIG(uint32_t, stream_none_reader_delay_ms, General::kStreamNoneReaderDelayMS);
     if (!_is_enable || _last_check.elapsedTime() > stream_none_reader_delay_ms) {

src/Common/MultiMediaSourceMuxer.h

@@ -237,8 +237,6 @@ protected:
     bool onTrackFrame(const Frame::Ptr &frame) override;
     bool onTrackFrame_l(const Frame::Ptr &frame);
 
-    MediaSource::Ptr getAnyMediaSource() const;
-
 private:
     void createGopCacheIfNeed(size_t gop_count);
     std::shared_ptr<MediaSinkInterface> makeRecorder(Recorder::type type);
@@ -267,9 +265,8 @@ private:
     HlsFMP4Recorder::Ptr _hls_fmp4;
     toolkit::EventPoller::Ptr _poller;
     RingType::Ptr _ring;
-
     MediaSinkInterface::Ptr _delegate;
-
+    MediaSourceNull::Ptr _null_src;
     // 对象个数统计  [AUTO-TRANSLATED:3b43e8c2]
     // Object count statistics
     toolkit::ObjectStatistic<MultiMediaSourceMuxer> _statistic;