res_musiconhold: Start playlist after initial announcement

Reset the samples counter to zero when we are done playing an
announcement so that we don't skip into the middle of the first file in
the playlist.

Also add the selected annoucement to the output of 'moh show classes.'

ASTERISK-24329 #close
Reported by: Thomas Frederiksen

Change-Id: I2a5f986a31279c981592f49391409ebf38d6f6d0

res/res_musiconhold.c

@@ -333,6 +333,7 @@ static int ast_moh_files_next(struct ast_channel *chan)
 		}
 	} else {
 		state->announcement = 0;
+		state->samples = 0;
 	}
 
 	if (!state->class->total_files) {
@@ -1934,6 +1935,9 @@ static char *handle_cli_moh_show_classes(struct ast_cli_entry *e, int cmd, struc
 		ast_cli(a->fd, "Class: %s\n", class->name);
 		ast_cli(a->fd, "\tMode: %s\n", S_OR(class->mode, "<none>"));
 		ast_cli(a->fd, "\tDirectory: %s\n", S_OR(class->dir, "<none>"));
+		if (ast_test_flag(class, MOH_ANNOUNCEMENT)) {
+			ast_cli(a->fd, "\tAnnouncement: %s\n", S_OR(class->announcement, "<none>"));
+		}
 		if (ast_test_flag(class, MOH_CUSTOM)) {
 			ast_cli(a->fd, "\tApplication: %s\n", S_OR(class->args, "<none>"));
 			ast_cli(a->fd, "\tKill Escalation Delay: %zu ms\n", class->kill_delay / 1000);