From owner-freebsd-multimedia@FreeBSD.ORG  Thu Oct 11 09:29:04 2007
Return-Path: <owner-freebsd-multimedia@FreeBSD.ORG>
Delivered-To: freebsd-multimedia@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 3A09716A420
	for <freebsd-multimedia@freebsd.org>;
	Thu, 11 Oct 2007 09:29:04 +0000 (UTC)
	(envelope-from achill@matrix.gatewaynet.com)
Received: from smadev.internal.net (host3.dynacom.ondsl.gr [62.103.35.211])
	by mx1.freebsd.org (Postfix) with ESMTP id C050E13C45B
	for <freebsd-multimedia@freebsd.org>;
	Thu, 11 Oct 2007 09:29:03 +0000 (UTC)
	(envelope-from achill@matrix.gatewaynet.com)
Received: from smadev.internal.net (localhost [127.0.0.1])
	by smadev.internal.net (8.13.6/8.13.6) with ESMTP id l9B9Ssl5050908;
	Thu, 11 Oct 2007 12:28:54 +0300 (EEST)
	(envelope-from achill@matrix.gatewaynet.com)
Received: by smadev.internal.net (8.13.6/8.13.6/Submit) id l9B9SmId050907;
	Thu, 11 Oct 2007 12:28:48 +0300 (EEST)
	(envelope-from achill@matrix.gatewaynet.com)
From: Achilleas Mantzios <achill@matrix.gatewaynet.com>
Organization: Dynacom Tankers Mgmt
To: Mark Tinguely <tinguely@casselton.net>
Date: Thu, 11 Oct 2007 12:28:47 +0300
User-Agent: KMail/1.9.3
References: <200710051443.l95EhAOV066689@casselton.net>
In-Reply-To: <200710051443.l95EhAOV066689@casselton.net>
MIME-Version: 1.0
Content-Type: text/plain;
  charset="utf-8"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200710111228.47687.achill@matrix.gatewaynet.com>
Cc: freebsd-multimedia@freebsd.org
Subject: Re: Zoneminder and multichannel cards
X-BeenThere: freebsd-multimedia@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Multimedia discussions <freebsd-multimedia.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-multimedia>, 
	<mailto:freebsd-multimedia-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-multimedia>
List-Post: <mailto:freebsd-multimedia@freebsd.org>
List-Help: <mailto:freebsd-multimedia-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-multimedia>, 
	<mailto:freebsd-multimedia-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 11 Oct 2007 09:29:04 -0000

Just a question, in context with our previous discussions.
I managed to capture video from more than 1 camera, in zoneminder.
I'd like to ask, whats the theoritical max fps for each of 4 cameras using the 
bktr driver in its FreeBSD-6.2 state?

In my code, with METEOR_CAP_CONTINOUS (single camera) it can do
(as ZM reports) 25 fps (which AFAIK is good), whereas with all 4 cameras
and by using METEOR_CAP_SINGLE, the fps drop down to 2.5 fps/camera.

Is that the max the driver can do, or is my code in trouble?
Where is what i do (pseudocode):

void initialize() {
	if (single camera) {
		c = METEOR_CAP_CONTINOUS;
	        ioctl(m_videohandle, METEORCAPTUR, &c);
	}
}

void PreCapture(int channel) {
	if (number_of_cameras > 1) { 
/* this runs only when number of cameras are 2 or more */
		/*stop continous capture */
		int tmpc = METEOR_CAP_STOP_CONT;
/*1*/		ioctl(m_videohandle, METEORCAPTUR, &tmpc); 

		/* set the input */
		int tmpint=bktr_dev[channel];
/*2*/		ioctl(m_videohandle, METEORSINPUT, &tmpint);

		/* 3 set single capture mode */
		tmpc = METEOR_CAP_SINGLE;
/*3*/		ioctl(m_videohandle, METEORCAPTUR, &tmpc); 
	}
}


The PreCapture method is never called when number_of_cameras > 1.
In case (number_of_cameras > 1), the operations "1" and "3" are needed to be 
run only the first time that capture() is run. Subsequent runs dont need 
those.

Has the above code any flaws?
If i try to remove syscalls "1","3" from runs 2,3,4,... whould i have better 
performance?

Any ideas are wellcome.
-- 
Achilleas Mantzios