From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Sean M. Pappalardo - D.J. Pegasus" Subject: Help requested: new HSS1394 MIDI back-end Date: Fri, 25 May 2012 21:43:17 +0200 Message-ID: <4FBFE0D5.8030501@mixxx.org> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============8031111226226226646==" Return-path: Received: from mail-bk0-f51.google.com (mail-bk0-f51.google.com [209.85.214.51]) by alsa0.perex.cz (Postfix) with ESMTP id E9090244B8 for ; Fri, 25 May 2012 21:43:25 +0200 (CEST) Received: by bkcjg15 with SMTP id jg15so1046238bkc.38 for ; Fri, 25 May 2012 12:43:25 -0700 (PDT) List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org This is a cryptographically signed message in MIME format. --===============8031111226226226646== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms040305060501010207020405" This is a cryptographically signed message in MIME format. --------------ms040305060501010207020405 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable Hello everyone. I am a developer for Mixxx, GPL cross-platform digital DJ software:=20 http://www.mixxx.org. My focus is the controller subsystem. I am ready=20 to finally add Linux support for HSS1394 DJ controllers such as=20 Stanton's SCS.1m and SCS.1d. HSS1394 is just MIDI over IEEE1394 (Firewire) at wire speed. The Windows = and OSX library source code is LGPL and available on LaunchPad here:=20 https://launchpad.net/hss1394 The Stanton SCS.1m is a sound interface integrated with a two-way=20 control surface that speaks HSS1394. (The sound card uses an Oxford chip = set and works fine with FFADO 2.0.1 today up to 96kHz. I use it with=20 Mixxx via JACK.) The Stanton SCS.1d is a two-way control surface (no sound card) that=20 speaks HSS1394 and is capable of sending ALOT of latency-sensitive data: = about 4000 messages per platter rotation. (Now imagine if you had four=20 or even two of them on the same network running at +50% speed. This=20 would quickly overwhelm USB, at least at the time these devices were=20 designed.) Read about them here: http://www.stantondj.com/stanton-controllers-systems/system1.html After a lengthy discussion on the FFADO mailing list, we determined that = the best (cleanest and most flexible) way to get Linux support for these = devices is to write an ALSA kernel driver that speaks HSS1394 with the=20 devices and presents an ALSA MIDI device (with no data rate limits) for=20 each to Linux applications. The advantage of doing this is that the devices will appear to all MIDI=20 applications without them having to have specific support for HSS1394.=20 This means they could be used in DAW applications as well. (FWIW, FFADO trunk has a program called test-scs that does exactly this, = but using that is impractical because it depends on various internal=20 parts of the FFADO source so would require bundling all of FFADO with=20 the application, and it's unable to see non-audio devices due to FFADO's = intended use (so it sees the SCS.1m but not the .1d.)) So my questions are: where can I find documentation on writing a new=20 MIDI driver for ALSA? And is anyone else interested in helping me do this= ? Thank you very much for your time and work. Help me take the last step=20 to my dream DJ setup! (Linux, FLAC and SCS.1 controllers.) Sincerely, Sean M. Pappalardo "D.J. Pegasus" Mixxx Developer - Controller Specialist --------------ms040305060501010207020405 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIINtjCC BjQwggQcoAMCAQICASAwDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoT DVN0YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNp Z25pbmcxKTAnBgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3 MTAyNDIxMDI1NVoXDTE3MTAyNDIxMDI1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1T dGFydENvbSBMdGQuMSswKQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWdu aW5nMTgwNgYDVQQDEy9TdGFydENvbSBDbGFzcyAyIFByaW1hcnkgSW50ZXJtZWRpYXRlIENs aWVudCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMsohUWcASz7GfKrpTOM KqANy9BV7V0igWdGxA8IU77L3aTxErQ+fcxtDYZ36Z6GH0YFn7fq5RADteP0AYzrCA+EQTfi 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