client API: add event for metadata changes

6 files changed, 16 insertions, 3 deletions

diff --git a/DOCS/man/en/lua.rst b/DOCS/man/en/lua.rst
index 9176051231..2d6a7728b6 100644
--- a/DOCS/man/en/lua.rst
+++ b/DOCS/man/en/lua.rst
@@ -388,3 +388,6 @@ List of events
 
 ``audio-reconfig``
     Happens on audio output or filter reconfig.
+
+``metadata-update``
+    Metadata (like file tags) was updated.
diff --git a/demux/demux.c b/demux/demux.c
index 02e50a53c0..c15d66a8d3 100644
--- a/demux/demux.c
+++ b/demux/demux.c
@@ -745,7 +745,7 @@ char *demux_info_get(demuxer_t *demuxer, const char *opt)
     return mp_tags_get_str(demuxer->metadata, opt);
 }
 
-void demux_info_update(struct demuxer *demuxer)
+bool demux_info_update(struct demuxer *demuxer)
 {
     struct mp_tags *tags = demuxer->metadata;
     // Take care of stream metadata as well
@@ -767,8 +767,10 @@ void demux_info_update(struct demuxer *demuxer)
         talloc_free(demuxer->previous_metadata);
         demuxer->previous_metadata = data;
         demux_info_print(demuxer);
+        return true;
     } else {
         talloc_free(data);
+        return false;
     }
 }
 
diff --git a/demux/demux.h b/demux/demux.h
index 3d3a3e5bc8..a8c407e7ba 100644
--- a/demux/demux.h
+++ b/demux/demux.h
@@ -244,7 +244,7 @@ void demux_flush(struct demuxer *demuxer);
 int demux_seek(struct demuxer *demuxer, float rel_seek_secs, int flags);
 
 char *demux_info_get(struct demuxer *demuxer, const char *opt);
-void demux_info_update(struct demuxer *demuxer);
+bool demux_info_update(struct demuxer *demuxer);
 
 int demux_control(struct demuxer *demuxer, int cmd, void *arg);
 
diff --git a/libmpv/client.h b/libmpv/client.h
index 7bc613b15e..5139ceddfa 100644
--- a/libmpv/client.h
+++ b/libmpv/client.h
@@ -638,6 +638,12 @@ typedef enum mpv_event_id {
      * because there is no such thing as audio output embedding.
      */
     MPV_EVENT_AUDIO_RECONFIG    = 18,
+    /**
+     * Happens when metadata (like file tags) is possibly updated. (It's left
+     * unspecified whether this happens on file start or only when it changes
+     * within a file.)
+     */
+    MPV_EVENT_METADATA_UPDATE   = 19,
 } mpv_event_id;
 
 /**
diff --git a/player/client.c b/player/client.c
index f63611f79c..39c28d2074 100644
--- a/player/client.c
+++ b/player/client.c
@@ -844,6 +844,7 @@ static const char *event_table[] = {
     [MPV_EVENT_CLIENT_MESSAGE] = "client-message",
     [MPV_EVENT_VIDEO_RECONFIG] = "video-reconfig",
     [MPV_EVENT_AUDIO_RECONFIG] = "audio-reconfig",
+    [MPV_EVENT_METADATA_UPDATE] = "metadata-update",
 };
 
 const char *mpv_event_name(mpv_event_id event)
diff --git a/player/playloop.c b/player/playloop.c
index 261deaf217..88adf9e35c 100644
--- a/player/playloop.c
+++ b/player/playloop.c
@@ -669,7 +669,8 @@ static bool handle_osd_redraw(struct MPContext *mpctx)
 static void handle_metadata_update(struct MPContext *mpctx)
 {
     if (mp_time_sec() > mpctx->last_metadata_update + 2) {
-        demux_info_update(mpctx->demuxer);
+        if (demux_info_update(mpctx->demuxer))
+            mp_notify(mpctx, MPV_EVENT_METADATA_UPDATE, NULL);
         mpctx->last_metadata_update = mp_time_sec();
     }
 }