core: update metadata during playback, allow streams to export metadata

STREAM_CTRL_GET_METADATA will be used to poll for streamcast metadata.
Also add DEMUXER_CTRL_UPDATE_INFO, which could in theory be used by
demux_lavf.c. (Unfortunately, libavformat is too crappy to read metadata
mid-stream for mp3 or ogg, so we don't implement it.)

1 files changed, 13 insertions, 0 deletions

diff --git a/demux/demux.c b/demux/demux.c
index b66f5e3e61..a5d3211b0a 100644
--- a/demux/demux.c
+++ b/demux/demux.c
@@ -976,6 +976,7 @@ static struct demuxer *open_given_type(struct MPOpts *opts,
         }
         add_stream_chapters(demuxer);
         demuxer_sort_chapters(demuxer);
+        demux_info_update(demuxer);
         return demuxer;
     } else {
         // demux_mov can return playlist instead of mov
@@ -1227,6 +1228,18 @@ char *demux_info_get(demuxer_t *demuxer, const char *opt)
     return NULL;
 }
 
+void demux_info_update(struct demuxer *demuxer)
+{
+    demux_control(demuxer, DEMUXER_CTRL_UPDATE_INFO, NULL);
+    // Take care of stream metadata as well
+    char **meta;
+    if (stream_control(demuxer->stream, STREAM_CTRL_GET_METADATA, &meta) > 0) {
+        for (int n = 0; meta[n + 0]; n += 2)
+            demux_info_add(demuxer, meta[n + 0], meta[n + 1]);
+        talloc_free(meta);
+    }
+}
+
 int demux_control(demuxer_t *demuxer, int cmd, void *arg)
 {