[FFmpeg-devel] [PATCH 3/4] avfilter/asrc_sine: increase frequency accuracy

[Nicolas George]

Marton Balint (12024-11-10):
> Previously the delta phase was fixed point fractional with 2^32 fractions,
> which caused inaccuracies in the output frequency, unless the input
> frequency*2^32 was divisable by the sample rate.
> 
> This patch improves frequency accuracy by tracking subfractions of the delta
> phase fractions. For this we are using a denominator which is a multiple of the
> sample rate, making sure that integer frequencies are always accurately
> represented.
> 
> Signed-off-by: Marton Balint <cus at passwd.hu>
> ---
>  libavfilter/asrc_sine.c | 24 +++++++++++++++++++++++-
>  1 file changed, 23 insertions(+), 1 deletion(-)

Sorry for the delay. The logic looks sound, and I am assuming you have
checked that it now gives periodical output when the frequency is a
divisor of the sample frequency, so ok.

Regards,

-- 
  Nicolas George