[FFmpeg-devel] [PATCH 2/2] lavfi/af_anequalizer: replace pow(x, -2) by 1/(x*x)

[Ganesh Ajjanagadde]

On Mon, Dec 28, 2015 at 12:14 AM, Paul B Mahol <onemda at gmail.com> wrote:
> On 12/28/15, Ganesh Ajjanagadde <gajjanagadde at gmail.com> wrote:
>> Signed-off-by: Ganesh Ajjanagadde <gajjanagadde at gmail.com>
>> ---
>>  libavfilter/af_anequalizer.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/libavfilter/af_anequalizer.c b/libavfilter/af_anequalizer.c
>> index d7b5b6c..649c0b9 100644
>> --- a/libavfilter/af_anequalizer.c
>> +++ b/libavfilter/af_anequalizer.c
>> @@ -391,8 +391,8 @@ static void chebyshev1_bp_filter(EqualizatorFilter *f,
>>
>>      epsilon = sqrt((G*G - Gb*Gb) / (Gb*Gb - G0*G0));
>>      g0 = pow(G0,1.0/N);
>> -    alfa = pow(1.0/epsilon    + sqrt(1 + pow(epsilon,-2.0)), 1.0/N);
>> -    beta = pow(G/epsilon + Gb * sqrt(1 + pow(epsilon,-2.0)), 1.0/N);
>> +    alfa = pow(1.0/epsilon    + sqrt(1 + 1/(epsilon*epsilon)), 1.0/N);
>> +    beta = pow(G/epsilon + Gb * sqrt(1 + 1/(epsilon*epsilon)), 1.0/N);
>>      a = 0.5 * (alfa - 1.0/alfa);
>>      b = 0.5 * (beta - g0*g0*(1/beta));
>>      tetta_b = tan(wb/2);
>> --
>> 2.6.4
>>
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>>
>
> both patches ok

thanks, please also have a look at the one removing cabs/cexp:
https://ffmpeg.org/pipermail/ffmpeg-devel/2015-December/185847.html.
Pushing later today.