main/bridge: Add some verbose logging for video source changes

It's actually quite useful to see the source of a video stream change.
This doesn't happen terribly often, even with talk detection - but when
it does, it's nice to know which channel is now providing your video
stream.

As a verbose 5 level message, it shouldn't be terribly spammy or costly
to have, and is 'lower level' then most other verbose messages that the
bridge system emits.

ASTERISK-26555

Change-Id: Ia1c20ecafa9670171fd38bddcf3beccae47fb15c

main/bridge.c

@@ -3770,6 +3770,10 @@ void ast_bridge_set_single_src_video_mode(struct ast_bridge *bridge, struct ast_
 	cleanup_video_mode(bridge);
 	bridge->softmix.video_mode.mode = AST_BRIDGE_VIDEO_MODE_SINGLE_SRC;
 	bridge->softmix.video_mode.mode_data.single_src_data.chan_vsrc = ast_channel_ref(video_src_chan);
+	ast_verb(5, "Video source in bridge '%s' (%s) is now '%s' (%s)\n",
+		bridge->name, bridge->uniqueid,
+		ast_channel_name(video_src_chan),
+		ast_channel_uniqueid(video_src_chan));
 	ast_test_suite_event_notify("BRIDGE_VIDEO_MODE", "Message: video mode set to single source\r\nVideo Mode: %u\r\nVideo Channel: %s",
 		bridge->softmix.video_mode.mode, ast_channel_name(video_src_chan));
 	ast_indicate(video_src_chan, AST_CONTROL_VIDUPDATE);
@@ -3810,6 +3814,10 @@ void ast_bridge_update_talker_src_video_mode(struct ast_bridge *bridge, struct a
 		}
 		data->chan_vsrc = ast_channel_ref(chan);
 		data->average_talking_energy = talker_energy;
+		ast_verb(5, "Video source in bridge '%s' (%s) is now '%s' (%s)\n",
+			bridge->name, bridge->uniqueid,
+			ast_channel_name(data->chan_vsrc),
+			ast_channel_uniqueid(data->chan_vsrc));
 		ast_test_suite_event_notify("BRIDGE_VIDEO_SRC", "Message: video source updated\r\nVideo Channel: %s", ast_channel_name(data->chan_vsrc));
 		ast_indicate(data->chan_vsrc, AST_CONTROL_VIDUPDATE);
 	} else if ((data->average_talking_energy < talker_energy) && !is_keyframe) {
@@ -3817,6 +3825,10 @@ void ast_bridge_update_talker_src_video_mode(struct ast_bridge *bridge, struct a
 	} else if (!data->chan_vsrc && is_keyframe) {
 		data->chan_vsrc = ast_channel_ref(chan);
 		data->average_talking_energy = talker_energy;
+		ast_verb(5, "Video source in bridge '%s' (%s) is now '%s' (%s)\n",
+			bridge->name, bridge->uniqueid,
+			ast_channel_name(data->chan_vsrc),
+			ast_channel_uniqueid(data->chan_vsrc));
 		ast_test_suite_event_notify("BRIDGE_VIDEO_SRC", "Message: video source updated\r\nVideo Channel: %s", ast_channel_name(data->chan_vsrc));
 		ast_indicate(chan, AST_CONTROL_VIDUPDATE);
 	} else if (!data->chan_old_vsrc && is_keyframe) {