Add managed channel administration and moderation

tests/test_channel_samplerate.cpp

@@ -86,6 +86,7 @@ static bool connect_guest(vc_client*& client, const char* name, const char* labe
     if (!client) return false;
     ev.client = client;
     ev.label  = label;
+    if (vc_set_external_playback(client, 1) != VC_OK) return false;
     if (vc_connect(client, "127.0.0.1", port) != VC_OK) return false;
     if (vc_authenticate_guest(client, name) != VC_OK) return false;
     if (!wait_for(ev, [](EventStore& s) { return s.auth_ok; }, 8000)) return false;
@@ -163,6 +164,7 @@ static int64_t run_case(uint16_t port, vc_client* admin, EventStore& evAdmin,
     CHECK(connect_guest(clientA, "SrA", "sr-a", port, evA));
     CHECK(connect_guest(clientB, "SrB", "sr-b", port, evB));
     int64_t energy = -1;
+    SinkData sink; // Outlives both clients and their final audio callbacks.
     if (!clientA || !clientB) goto cleanup;
 
     {
@@ -174,11 +176,11 @@ static int64_t run_case(uint16_t port, vc_client* admin, EventStore& evAdmin,
         CHECK(vc_move_user(admin, b_uid, channel_id) == VC_OK);
         std::this_thread::sleep_for(std::chrono::milliseconds(500));
 
-        SinkData sink;
         CHECK(vc_set_pcm_sink(clientB, pcm_sink, &sink) == VC_OK);
 
         vc_stream_desc desc{};
         desc.kind = VC_STREAM_MIC;
+        desc.external_feed = 1; // Measure only the injected tone, never the host microphone.
         uint32_t a_sid = 0;
         CHECK(vc_stream_start(clientA, &desc, &a_sid) == VC_OK);
 
@@ -201,7 +203,7 @@ static int64_t run_case(uint16_t port, vc_client* admin, EventStore& evAdmin,
         CHECK(sink_wait(sink, 5000));
         std::this_thread::sleep_for(std::chrono::milliseconds(1500));
 
-        energy = sink.total_energy;
+        { std::lock_guard lk(sink.mu); energy = sink.total_energy; }
         std::printf("test_channel_samplerate[%s]: sr=%u calls=%d energy=%lld\n",
                     tag, expect_sr, sink.call_count.load(), static_cast<long long>(energy));
         CHECK(sink.call_count.load() > 0);