From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8B155C433DF for ; Sun, 31 May 2020 21:54:33 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 363FB206C3 for ; Sun, 31 May 2020 21:54:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="n2eP8tlI" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 363FB206C3 Authentication-Results: mail.kernel.org; dmarc=pass (p=none dis=none) header.from=alsa-project.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id C604F1693; Sun, 31 May 2020 23:53:41 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz C604F1693 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1590962071; bh=pf2GvYxUR06Y3rWJKeCALBJXPMrBsWqhuWMdyuSVWdk=; h=From:To:In-Reply-To:References:Subject:Date:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=n2eP8tlITp9fRx46eilYCNia3vg8B5Cve+jHIu6Ky++jivbA2yjiu94frpWDdSOSh TN+QTHuRXvbDoQoHmWdEzzDFaXwuEYtcbcJQehv7gJB+wP334/iCxhGnhr5MdUyQRP 3M3+ri9rDRaEJgbqKZl3HSHu/lZqRaFUfIUegPNI= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 39E74F80213; Sun, 31 May 2020 23:53:41 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 130BFF8023F; Sun, 31 May 2020 23:52:45 +0200 (CEST) Received: from webhooks-bot.alsa-project.org (gate.perex.cz [77.48.224.242]) by alsa1.perex.cz (Postfix) with ESMTP id CF56AF8013D for ; Sun, 31 May 2020 23:52:41 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz CF56AF8013D MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit From: GitHub issues - opened To: alsa-devel@alsa-project.org In-Reply-To: <1590961958912374020-webhooks-bot@alsa-project.org> References: <1590961958912374020-webhooks-bot@alsa-project.org> Subject: No way to get notified of playback progress Message-Id: <20200531215245.130BFF8023F@alsa1.perex.cz> Date: Sun, 31 May 2020 23:52:45 +0200 (CEST) X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" alsa-project/alsa-lib issue #54 was opened from wm4: See subject. There is a way to run user code in a signal handler with snd_async_add_pcm_handler(). But that seems extremely questionable, is for sure not supported everywhere, and is probably full of subtle synchronization bugs. There is snd_pcm_poll_descriptors() and related, but that seems to signal only whether at least 1 period is available, nothing else. Judging from the docs. That seems like a rather big missing thing - I probably overlooked something. Otherwise this is a feature request for an asynchronous notification on period boundaries/underruns/device disconnection, that does not run in a UNIX signal handler. Maybe something relatively similar to that poll() mechanism. Issue URL : https://github.com/alsa-project/alsa-lib/issues/54 Repository URL: https://github.com/alsa-project/alsa-lib