ff_clz is faster, and uses an intrinsic (at the moment on GCC). exp2 is
a wasteful function for a simple integer exponentiation.
Untested.
Signed-off-by: Ganesh Ajjanagadde <gajjanaga...@gmail.com>
---
libavfilter/af_sofalizer.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/libavfilter/af_sofalizer.c b/libavfilter/af_sofalizer.c
index 6a24cbc..0bd1931 100644
--- a/libavfilter/af_sofalizer.c
+++ b/libavfilter/af_sofalizer.c
@@ -30,6 +30,7 @@
#include "libavcodec/avfft.h"
#include "libavutil/float_dsp.h"
+#include "libavutil/intmath.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "internal.h"
@@ -996,8 +997,8 @@ static int config_input(AVFilterLink *inlink)
}
/* buffer length is longest IR plus max. delay -> next power of 2
(32 - count leading zeros gives required exponent) */
- s->buffer_length = exp2(32 - clz((uint32_t)n_max));
- s->n_fft = exp2(32 - clz((uint32_t)(n_max + inlink->sample_rate)));
+ s->buffer_length = 1 << (32 - ff_clz(n_max));
+ s->n_fft = 1 << (32 - ff_clz(n_max + inlink->sample_rate));
if (s->type == FREQUENCY_DOMAIN) {
av_fft_end(s->fft[0]);
--
2.6.4
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