Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932506AbcKNOQP (ORCPT ); Mon, 14 Nov 2016 09:16:15 -0500 Received: from mail-yw0-f180.google.com ([209.85.161.180]:33482 "EHLO mail-yw0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932109AbcKNOQL (ORCPT ); Mon, 14 Nov 2016 09:16:11 -0500 MIME-Version: 1.0 In-Reply-To: <8ff2fc76-2290-d353-08cd-2aa31c31a19c@xs4all.nl> References: <1470247430-11168-1-git-send-email-steve_longerbeam@mentor.com> <1470247430-11168-8-git-send-email-steve_longerbeam@mentor.com> <8ff2fc76-2290-d353-08cd-2aa31c31a19c@xs4all.nl> From: Devin Heitmueller Date: Mon, 14 Nov 2016 09:16:08 -0500 Message-ID: Subject: Re: [PATCH v4 7/8] v4l: Add signal lock status to source change events To: Hans Verkuil Cc: Steve Longerbeam , Lars-Peter Clausen , mchehab@kernel.org, Linux Media Mailing List , Linux Kernel , Steve Longerbeam , Mauro Carvalho Chehab Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 550 Lines: 17 > OK, but what can the application do with that event? If the glitch didn't > affect the video, then it is pointless. > > If the lock is lost, then normally you loose video as well. If not, then > applications are not interested in the event. What about free running mode (where some decoders delivers blue or black video with no signal present)? In that case it might still be useful to inform the application so it can show a message that says something like "No Signal". Devin -- Devin J. Heitmueller - Kernel Labs http://www.kernellabs.com