On 12/17/15, Ganesh Ajjanagadde <gajjanaga...@gmail.com> wrote:
> exp2 is faster.
>
> Signed-off-by: Ganesh Ajjanagadde <gajjanaga...@gmail.com>
> ---
> libavcodec/opus_celt.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/libavcodec/opus_celt.c b/libavcodec/opus_celt.c
> index 9911de3..474452f 100644
> --- a/libavcodec/opus_celt.c
> +++ b/libavcodec/opus_celt.c
> @@ -1677,7 +1677,7 @@ static void celt_denormalize(CeltContext *s, CeltFrame
> *frame, float *data)
>
> for (i = s->startband; i < s->endband; i++) {
> float *dst = data + (celt_freq_bands[i] << s->duration);
> - float norm = pow(2, frame->energy[i] + celt_mean_energy[i]);
> + float norm = exp2(frame->energy[i] + celt_mean_energy[i]);
>
> for (j = 0; j < celt_freq_range[i] << s->duration; j++)
> dst[j] *= norm;
> @@ -1857,7 +1857,7 @@ static void process_anticollapse(CeltContext *s,
> CeltFrame *frame, float *X)
>
> /* r needs to be multiplied by 2 or 2*sqrt(2) depending on LM
> because
> short blocks don't have the same energy as long */
> - r = pow(2, 1 - Ediff);
> + r = exp2(1 - Ediff);
> if (s->duration == 3)
> r *= M_SQRT2;
> r = FFMIN(thresh, r) * sqrt_1;
> --
> 2.6.3
>
> _______________________________________________
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>
should be ok iff fate passes.
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