From: "Henryk Plötz" <henryk@ploetzli.ch>
To: bluez-devel@lists.sourceforge.net
Subject: Re: [Bluez-devel] Elimination of pow() in SBC code
Date: Sun, 28 Nov 2004 02:57:50 +0100 [thread overview]
Message-ID: <20041128025750.00e11da4.henryk@ploetzli.ch> (raw)
In-Reply-To: <1101599506.18467.6.camel@pegasus>
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Moin,
Am Sun, 28 Nov 2004 00:51:46 +0100 schrieb Marcel Holtmann:
> the pow() function is the only reason for linking with -lm and it is
> only used in one place with a limit range of parameters.
Oh yes, that occurence of pow(2.0, x) is in older code I forgot about.
(And before -lm was necessary for cos(), too)
> So what is the range of scale_factor[ch][sb]. From a quick testing a
> saw that it ranges from 0 - 15. Is this always true?
Yes, scale_factor is a 4 bit integer (Table 12.13 of A2DP) and there
should be no way of getting it bigger. If there was this would be a bug.
> If yes, then I would use a pre-calculated array for 2^x.
Isn't 1<<x good enough for that?
--
Henryk Plötz
Grüße aus Berlin
~~~~~~~ Un-CDs, nein danke! http://www.heise.de/ct/cd-register/ ~~~~~~~
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next prev parent reply other threads:[~2004-11-28 1:57 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-27 23:51 [Bluez-devel] Elimination of pow() in SBC code Marcel Holtmann
2004-11-28 1:57 ` Henryk Plötz [this message]
2004-11-28 12:15 ` Marcel Holtmann
2004-11-28 2:38 ` Brad Midgley
2004-11-28 13:32 ` Marcel Holtmann
2004-11-28 15:57 ` Brad Midgley
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