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[78.124.78.108]) by smtp.gmail.com with ESMTPSA id a13sm35398740wrh.80.2020.03.25.10.44.36 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Mar 2020 10:44:37 -0700 (PDT) Date: Wed, 25 Mar 2020 17:44:19 +0000 From: sylvain.bertrand@gmail.com To: alsa-devel@alsa-project.org Subject: sw_params for a direct-ed(dmix) hw pcm Message-ID: <20200325174419.GA1224@freedom> References: <20200321155303.GB357@freedom> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20200321155303.GB357@freedom> User-Agent: Mutt/ (2018-04-13) 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" Hi, On this issue, I am doing something fundamentaly wrong, but I don't see how to do it right. While configuring a pcm, I should not use sw_params if it is a "direct-ed" (direct::dmix) real hw pcm: in pcm_direct.c, snd_pcm_direct_sw_params function is empty and it seems coherent with the fact the real hw pcm is actually shared and was probably already configured. How do I know a pcm is actually a "pipeline" of pcms which ends up with a "direct-ed" real hw pcm? That would tell my code how to behave regarding sw_params usage. Is this related to the "topology" and "ucm" apis? regards, -- Sylvain