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=-10.8 required=3.0 tests=BAYES_00,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 EC7A0C433DB for ; Fri, 19 Feb 2021 23:53:36 +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 4A8EB64EC7 for ; Fri, 19 Feb 2021 23:53:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4A8EB64EC7 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 22C0C1662; Sat, 20 Feb 2021 00:52:43 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 22C0C1662 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1613778813; bh=/r1rJVqB8/LN1nHheftFxJIosf4eljuH9LZ8BHYzd0I=; h=From:To:In-Reply-To:References:Subject:Date:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=Kqmxo+khdRQtf3L3uxpGI80JYdQ1HqIE4QLYGrlt902N8jSeKcNWYWxHNLJoMm1Tl 1i63Q2tbMWXbZQZq3M95CnOI4t7z63lEAbEjUww59DEUzc6WFE8ZplTH3ifjkuoi/C C4BB24pItVOpT290qZ8h/xeo8kvVhs2RkULZlXWM= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id A04C8F8013F; Sat, 20 Feb 2021 00:52:42 +0100 (CET) Received: by alsa1.perex.cz (Postfix, from userid 50401) id CBB73F8020B; Sat, 20 Feb 2021 00:52:41 +0100 (CET) Received: from webhooks-bot.alsa-project.org (gate.perex.cz [77.48.224.242]) by alsa1.perex.cz (Postfix) with ESMTP id 8BADAF8013F for ; Sat, 20 Feb 2021 00:52:37 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 8BADAF8013F 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: <1613778752188235044-webhooks-bot@alsa-project.org> References: <1613778752188235044-webhooks-bot@alsa-project.org> Subject: What is the semantics of snd_pcm_hw_params_any? Message-Id: <20210219235241.CBB73F8020B@alsa1.perex.cz> Date: Sat, 20 Feb 2021 00:52:41 +0100 (CET) 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 #119 was opened from jpalus: It is not really a bug report but rather a request for clarification in attempt to figure out who is to blame for incorrect pulseaudio behavior. I've got two different cards -- one internal and one USB -- which behave quite differently for this simple high level code: ``` snd_pcm_open() snd_pcm_hw_params_any() iterate snd_pcm_hw_params_test_rate() to check for supported rates snd_pcm_hw_params_set_rate_near(44100) snd_pcm_hw_params() snd_pcm_hw_params_any() iterate snd_pcm_hw_params_test_rate() to check for supported rates ``` In essence supported sample rates are queried twice, always with snd_pcm_hw_params_any() before them, but separated by snd_pcm_hw_params_set_rate_near(). Now with internal card both iterations report 7 supported rates while for USB first iteration reports 4 rates and second only one (44100). Is that expected or is snd_pcm_hw_params_any() supposed to provide configuration which would result in all rates reported again? Issue URL : https://github.com/alsa-project/alsa-lib/issues/119 Repository URL: https://github.com/alsa-project/alsa-lib