From 78c6c73770202cedcc92d4b19bccd4ffe9075bef Mon Sep 17 00:00:00 2001
From: Erik Kundiman <erik@megapahit.org>
Date: Thu, 22 Aug 2024 17:24:02 +0800
Subject: Stream notification

https://megapahit.com/show_bug.cgi?id=56
I could make such metadata setting triggered by an event only on the
media plugin's side, not on the viewer's side. I had tried adding
a MEDIA_EVENT_NOWPLAYING_CHANGED and hoped that mediactrl, viewerparcelmedia,
or viewermedia would react to it, but no, so this is the best I could
come up with for now, to keep checking if what's now playing has been
updated or not. I intentionally didn't clear mNowPlaying the way mURL is,
so that it wouldn't notify one last double after the player stops streaming.
mNowPlaying and mMediaNowPlaying need to be kept in their last states so
that the comparison is correct. I also intentionally didn't put the
notification inside the MEDIA_PLAYING scope, cause the flow somehow never
got into that scope.
---
 indra/llplugin/llpluginclassmedia.cpp              |  4 ++++
 indra/llplugin/llpluginclassmedia.h                |  2 ++
 indra/media_plugins/libvlc/media_plugin_libvlc.cpp | 14 ++++++++++++++
 indra/newview/llviewermedia_streamingaudio.cpp     |  7 +++++++
 indra/newview/llviewermedia_streamingaudio.h       |  1 +
 5 files changed, 28 insertions(+)

diff --git a/indra/llplugin/llpluginclassmedia.cpp b/indra/llplugin/llpluginclassmedia.cpp
index 453223b43e..2da24adbf7 100644
--- a/indra/llplugin/llpluginclassmedia.cpp
+++ b/indra/llplugin/llpluginclassmedia.cpp
@@ -1211,6 +1211,10 @@ void LLPluginClassMedia::receivePluginMessage(const LLPluginMessage &message)
             mMediaName = message.getValue("name");
             mediaEvent(LLPluginClassMediaOwner::MEDIA_EVENT_NAME_CHANGED);
         }
+        else if(message_name == "nowplaying_text")
+        {
+            mMediaNowPlaying = message.getValue("nowplaying");
+        }
         else if(message_name == "pick_file")
         {
             mIsMultipleFilePick = message.getValueBoolean("multiple_files");
diff --git a/indra/llplugin/llpluginclassmedia.h b/indra/llplugin/llpluginclassmedia.h
index 5d2f3bbb79..109f3880c5 100644
--- a/indra/llplugin/llpluginclassmedia.h
+++ b/indra/llplugin/llpluginclassmedia.h
@@ -311,6 +311,7 @@ public:
 
 
     const std::string& getMediaName() const { return mMediaName; };
+    const std::string& getMediaNowPlaying() const { return mMediaNowPlaying; };
     std::string getMediaDescription() const { return mMediaDescription; };
 
     // Crash the plugin.  If you use this outside of a testbed, you will be punished.
@@ -428,6 +429,7 @@ protected:
     bool            mCanPaste;
 
     std::string     mMediaName;
+    std::string     mMediaNowPlaying;
     std::string     mMediaDescription;
 
     LLColor4        mBackgroundColor;
diff --git a/indra/media_plugins/libvlc/media_plugin_libvlc.cpp b/indra/media_plugins/libvlc/media_plugin_libvlc.cpp
index a5d8f885fd..8ae9931dd4 100644
--- a/indra/media_plugins/libvlc/media_plugin_libvlc.cpp
+++ b/indra/media_plugins/libvlc/media_plugin_libvlc.cpp
@@ -294,6 +294,15 @@ void MediaPluginLibVLC::eventCallbacks(const libvlc_event_t* event, void* ptr)
         }
     }
     break;
+    case libvlc_MediaMetaChanged:
+        auto now_playing = libvlc_media_get_meta(parent->mLibVLCMedia, libvlc_meta_NowPlaying);
+        if (now_playing)
+        {
+            LLPluginMessage message(LLPLUGIN_MESSAGE_CLASS_MEDIA, "nowplaying_text");
+            message.setValue("nowplaying", now_playing);
+            parent->sendMessage(message);
+        }
+        break;
     }
 }
 
@@ -348,6 +357,11 @@ void MediaPluginLibVLC::playMedia()
         libvlc_event_attach(em, libvlc_MediaPlayerLengthChanged, eventCallbacks, this);
         libvlc_event_attach(em, libvlc_MediaPlayerTitleChanged, eventCallbacks, this);
     }
+    auto event_manager = libvlc_media_event_manager(mLibVLCMedia);
+    if (event_manager)
+    {
+        libvlc_event_attach(event_manager, libvlc_MediaMetaChanged, eventCallbacks, this);
+    }
 
     libvlc_video_set_callbacks(mLibVLCMediaPlayer, lock, unlock, display, &mLibVLCCallbackContext);
     libvlc_video_set_format(mLibVLCMediaPlayer, "RV32", mWidth, mHeight, mWidth * mDepth);
diff --git a/indra/newview/llviewermedia_streamingaudio.cpp b/indra/newview/llviewermedia_streamingaudio.cpp
index af3a21c183..15b6e3f802 100644
--- a/indra/newview/llviewermedia_streamingaudio.cpp
+++ b/indra/newview/llviewermedia_streamingaudio.cpp
@@ -34,6 +34,7 @@
 
 #include "llmimetypes.h"
 #include "lldir.h"
+#include "llnotificationmanager.h"
 
 LLStreamingAudio_MediaPlugins::LLStreamingAudio_MediaPlugins() :
     mMediaPlugin(NULL),
@@ -114,6 +115,12 @@ int LLStreamingAudio_MediaPlugins::isPlaying()
 
     LLPluginClassMediaOwner::EMediaStatus status =
         mMediaPlugin->getStatus();
+    auto nowPlaying = mMediaPlugin->getMediaNowPlaying();
+    if (mNowPlaying != nowPlaying)
+    {
+        LLNotificationsUI::LLNotificationManager::instance().onChat(LLChat{llformat("Now playing %s.", nowPlaying.c_str())}, LLSD{});
+        mNowPlaying = nowPlaying;
+    }
 
     switch (status)
     {
diff --git a/indra/newview/llviewermedia_streamingaudio.h b/indra/newview/llviewermedia_streamingaudio.h
index bf4d92c29e..5abefcdb0b 100644
--- a/indra/newview/llviewermedia_streamingaudio.h
+++ b/indra/newview/llviewermedia_streamingaudio.h
@@ -56,6 +56,7 @@ private:
     LLPluginClassMedia *mMediaPlugin;
 
     std::string mURL;
+    std::string mNowPlaying;
     F32 mGain;
 };
 
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