Edge: Dump cached metadata and sequence headers to late-joining consumers.

After v7.0.94 stopped creating SrsOriginHub on edge, the hub_active gate
in consumer_dumps() always evaluated false on edge, so late-joining
players never received the cached onMetaData / AVC SH / AAC SH and
failed with "dimensions not set". Fall back to the meta cache state when
hub_ is NULL so the dump path runs once the edge-pull has fetched
headers.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: winlinvip

trunk/src/app/srs_app_rtmp_source.cpp

@@ -2559,7 +2559,10 @@ srs_error_t SrsLiveSource::consumer_dumps(ISrsLiveConsumer *consumer, bool ds, b
     }
 
     // If stream is publishing, dumps the sequence header and gop cache.
-    bool hub_active = hub_ ? hub_->active() : false;
+    // On edge, hub_ is NULL; the source is "publishing" once the edge-pull has
+    // populated the meta cache. Late-joining consumers must still receive the
+    // cached metadata + sequence headers + GOP via this path.
+    bool hub_active = hub_ ? hub_->active() : (meta_->data() || meta_->vsh() || meta_->ash());
     if (hub_active) {
         // Copy metadata and sequence header to consumer.
         if ((err = meta_->dumps(consumer, atc_, jitter_algorithm_, dm, ds)) != srs_success) {