From owner-freebsd-usb@freebsd.org Mon Oct 9 20:41:18 2017 Return-Path: Delivered-To: freebsd-usb@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 1BDB5E3B69A for ; Mon, 9 Oct 2017 20:41:18 +0000 (UTC) (envelope-from hps@selasky.org) Received: from mail.turbocat.net (turbocat.net [88.99.82.50]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id D38347EEDB for ; Mon, 9 Oct 2017 20:41:16 +0000 (UTC) (envelope-from hps@selasky.org) Received: from hps2016.home.selasky.org (unknown [62.141.128.70]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.turbocat.net (Postfix) with ESMTPSA id 4104E260342; Mon, 9 Oct 2017 22:41:09 +0200 (CEST) Subject: Re: uaudio - distorted output To: Alexander Leidinger Cc: freebsd-usb@freebsd.org References: <20171008125631.Horde.ZsqSFDr1-uiT1YrkgH5i0tF@webmail.leidinger.net> <633f23dd-3b61-fe17-b894-6b1221a5dfd4@selasky.org> <20171008142514.Horde.hRkzth4Ur4wvjgUIlWuc70c@webmail.leidinger.net> <21e04dc4-045d-fb30-337a-7f7bd4fe8b50@selasky.org> <20171008230836.Horde.gG7VyE_62V3bMJX_VtbUrAP@webmail.leidinger.net> <85f5fd9a-2a58-9f5d-6796-716aae617274@selasky.org> <20171009210535.Horde.-orp9MzE2_7XgkKpP7K9L4J@webmail.leidinger.net> <9399c2dc-b514-fd0f-3401-57d43daad96b@selasky.org> <20171009214747.Horde.6Me9X2nep_RP1M2tHVDmKxq@webmail.leidinger.net> From: Hans Petter Selasky Message-ID: Date: Mon, 9 Oct 2017 22:38:32 +0200 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 In-Reply-To: <20171009214747.Horde.6Me9X2nep_RP1M2tHVDmKxq@webmail.leidinger.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-usb@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: FreeBSD support for USB List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Oct 2017 20:41:18 -0000 On 10/09/17 21:47, Alexander Leidinger wrote: >> If you are using multi channel audio equipment with 24-bits, try to >> avoid FULL-speed ones! > > Well... first I want to get the 2 channel 16bit case working... then I > will have a look at extending this to 5.1 (most probably 16bit, that's > enough to watch action movies). Hi, Some more ideas: 2 channel 16 bit will only work if you turn off bitperfect. The lowest number of channels the device exports is 4 for playback. That means the kernel will re-format 2 channels to 4 channels always and that is done by the PCM feeder. You'll need to check that there is a filter which handle that. You might want to install virtual_oss from ports to handle this device properly. --HPS