From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Original-To: caml-list@yquem.inria.fr Delivered-To: caml-list@yquem.inria.fr Received: from concorde.inria.fr (concorde.inria.fr [192.93.2.39]) by yquem.inria.fr (Postfix) with ESMTP id CBE34BB9C for ; Thu, 17 Nov 2005 10:17:53 +0100 (CET) Received: from mx1.polytechnique.org (mx1.polytechnique.org [129.104.30.34]) by concorde.inria.fr (8.13.0/8.13.0) with ESMTP id jAH9HrlK021201 for ; Thu, 17 Nov 2005 10:17:53 +0100 Received: from [192.168.0.11] (falcal.net [81.56.73.55]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ssl.polytechnique.org (Postfix) with ESMTP id 8984D331AA; Thu, 17 Nov 2005 10:17:52 +0100 (CET) In-Reply-To: References: Mime-Version: 1.0 (Apple Message framework v746.2) Content-Type: multipart/signed; micalg=sha1; boundary=Apple-Mail-4--706944812; protocol="application/pkcs7-signature" Message-Id: <640063C5-4B83-4635-9E9B-755E0F80D5A3@m4x.org> Cc: caml-list@yquem.inria.fr From: Damien Bobillot Subject: Re: [Caml-list] Video/Audio codecs in ocaml Date: Thu, 17 Nov 2005 10:17:57 +0100 To: Jonathan Roewen X-Mailer: Apple Mail (2.746.2) X-AV-Checked: ClamAV using ClamSMTP at djali.polytechnique.org (Thu Nov 17 10:17:52 2005 +0100 (CET)) X-DCC--Metrics: djali 32702; Body=1 Fuz1=1 Fuz2=1 X-Org-Mail: damien.bobillot.2002@polytechnique.org X-Miltered: at concorde with ID 437C4AC1.000 by Joe's j-chkmail (http://j-chkmail.ensmp.fr)! X-Spam: no; 0.00; damien:01 damien:01 caml-list:01 ocaml:01 flowed:01 ocaml:01 simd:01 ffmpeg:01 pkcs:01 065:98 emu:98 1341:98 wrote:01 slower:01 checking:02 X-Spam-Checker-Version: SpamAssassin 3.0.3 (2005-04-27) on yquem.inria.fr X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=none autolearn=disabled version=3.0.3 --Apple-Mail-4--706944812 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Jonathan Roewen wrote : >> Has anyone done anything with video and/or audio processing >> using ocaml? > > Even better: would anyone like to help with an mpeg2 decoder written > completely in ocaml? > > OCaml is supposed to be good at numerical processing right? So I hope > performance for a 100% software based decoder will be okay... With OCaml you can't use features like SIMD instructions of CPUs, and will do many bound checking, so it will be slower. I'm a bit sceptical that ocaml may be as good as C for pure signal processing. > My goal is to get something going within one week =P I have no idea if > it can be done, so we'll see... Writing a mpeg2 decoder won't take less than a week !!! (except perhaps if you've already spent time on a mpeg2 decoder) If you have to write something, a ocaml wrapper for ffmpeg may be a good start. -- Damien alias Schmurtz aim:goim?screenname=schmuuurtz --Apple-Mail-4--706944812 Content-Transfer-Encoding: base64 Content-Type: application/pkcs7-signature; name=smime.p7s Content-Disposition: attachment; filename=smime.p7s MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIGIjCCAtsw ggJEoAMCAQICAw54xzANBgkqhkiG9w0BAQQFADBiMQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhh d3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVt YWlsIElzc3VpbmcgQ0EwHhcNMDUwNDEzMTc1MTAxWhcNMDYwNDEzMTc1MTAxWjBJMR8wHQYDVQQD ExZUaGF3dGUgRnJlZW1haWwgTWVtYmVyMSYwJAYJKoZIhvcNAQkBFhdkYW1pZW4uYm9iaWxsb3RA bTR4Lm9yZzCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJ1TOYBqwJ42s0Fzz56jY1p0 fplGyikFgoNEUKGnOpqt4vpeoqUppAnORt2yvdQJxfIkhsWkrD/diiPS7MTF73wcxlSJtqYzVzPK G/2WDm6dBinuWCIyWYFhtGedyxbap3kJW44H7cL7HUVVxZ0JhOIOTsjCoEzaeKnML7bctbIJeXEE lErfbDv2jA1PDG1ru5dx+Q+AmbexX92ygnntE6aX3QZLSbhrytg4yCRdV8cOyQ9eFruZBI42RJv3 nJXevjUOr4n+y/7bzijAJj4BFyUU+dllvj6bmk5brnUXheCSOD0Ci20dqGNC1MyJ43b6MoIrbW7j JwYIv12D6KuWoaUCAwEAAaM0MDIwIgYDVR0RBBswGYEXZGFtaWVuLmJvYmlsbG90QG00eC5vcmcw DAYDVR0TAQH/BAIwADANBgkqhkiG9w0BAQQFAAOBgQB0u5b6wgwsbcyzDHJTzshlCn4gshxWtU/1 mH77gBCpsY8L554YV4/Tvm1PzmDzErm++drQf5HMy8sEFjmwLvNfBP0BqtkSqsdRFGR4wHzTjMhS EW5LgmlaccqBQzqQrANtzglgBVbtmBDAV92qHjQslwHK4FohCRRzGl4DLQmqBDCCAz8wggKooAMC AQICAQ0wDQYJKoZIhvcNAQEFBQAwgdExCzAJBgNVBAYTAlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENh cGUxEjAQBgNVBAcTCUNhcGUgVG93bjEaMBgGA1UEChMRVGhhd3RlIENvbnN1bHRpbmcxKDAmBgNV BAsTH0NlcnRpZmljYXRpb24gU2VydmljZXMgRGl2aXNpb24xJDAiBgNVBAMTG1RoYXd0ZSBQZXJz b25hbCBGcmVlbWFpbCBDQTErMCkGCSqGSIb3DQEJARYccGVyc29uYWwtZnJlZW1haWxAdGhhd3Rl LmNvbTAeFw0wMzA3MTcwMDAwMDBaFw0xMzA3MTYyMzU5NTlaMGIxCzAJBgNVBAYTAlpBMSUwIwYD VQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29u YWwgRnJlZW1haWwgSXNzdWluZyBDQTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAxKY8VXNV +065yplaHmjAdQRwnd/p/6Me7L3N9VvyGna9fww6YfK/Uc4B1OVQCjDXAmNaLIkVcI7dyfArhVqq P3FWy688Cwfn8R+RNiQqE88r1fOCdz0Dviv+uxg+B79AgAJk16emu59l0cUqVIUPSAR/p7bRPGEE QB5kGXJgt/sCAwEAAaOBlDCBkTASBgNVHRMBAf8ECDAGAQH/AgEAMEMGA1UdHwQ8MDowOKA2oDSG Mmh0dHA6Ly9jcmwudGhhd3RlLmNvbS9UaGF3dGVQZXJzb25hbEZyZWVtYWlsQ0EuY3JsMAsGA1Ud DwQEAwIBBjApBgNVHREEIjAgpB4wHDEaMBgGA1UEAxMRUHJpdmF0ZUxhYmVsMi0xMzgwDQYJKoZI hvcNAQEFBQADgYEASIzRUIPqCy7MDaNmrGcPf6+svsIXoUOWlJ1/TCG4+DYfqi2fNi/A9BxQIJNw PP2t4WFiw9k6GX6EsZkbAMUaC4J0niVQlGLH2ydxVyWN3amcOY6MIE9lX5Xa9/eH1sYITq726jTl EBpbNU1341YheILcIRk13iSx0x1G/11fZU8xggLnMIIC4wIBATBpMGIxCzAJBgNVBAYTAlpBMSUw IwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVy c29uYWwgRnJlZW1haWwgSXNzdWluZyBDQQIDDnjHMAkGBSsOAwIaBQCgggFTMBgGCSqGSIb3DQEJ AzELBgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTA1MTExNzA5MTc1OFowIwYJKoZIhvcNAQkE MRYEFOq8hFTxiSPzF+LJVW3m2SU8dp52MHgGCSsGAQQBgjcQBDFrMGkwYjELMAkGA1UEBhMCWkEx JTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMTI1RoYXd0ZSBQ ZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBAgMOeMcwegYLKoZIhvcNAQkQAgsxa6BpMGIxCzAJ BgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQuMSwwKgYDVQQD EyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNzdWluZyBDQQIDDnjHMA0GCSqGSIb3DQEBAQUA BIIBAGnozWmxJfQRT/KUfutWi3XWeIfDCLoL2PFQb0ICkVvlB2SjTM2wCOtMJk+qEw6Ua66JunGT jHSeHz/9ENfXp60iCFcAxbV2bRdwg0o5OB+ZpYVFpiONh01Eq8/cbDaN7ntpNCJBVnIHtx2aYuXA nF1/W76qT/wQPDzfRwAuldQyFEOmmltUEALwWdU38xL7yMkIVrMTzaXPLUBwCyrNG16jinu2eq7c keUUZNstNf6HiWLPBX5u6UvQeDUMDclaAr4Qel23JEGCt4YEFMGdzorhDxP7+Y1q68rp9jqXfJWE 4l1UOrBpQZ0S3xd5J7qNnoc12r+X525V/iOWSIu2zOUAAAAAAAA= --Apple-Mail-4--706944812--