avcodec/nellymoserenc: use log2 instead of log()/M_LN2
authorGanesh Ajjanagadde <gajjanagadde@gmail.com>
Thu, 29 Oct 2015 04:06:00 +0000 (00:06 -0400)
committerGanesh Ajjanagadde <gajjanagadde@gmail.com>
Thu, 29 Oct 2015 22:46:00 +0000 (18:46 -0400)
This is likely more precise and conveys the intent better.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
libavcodec/nellymoserenc.c

index d7368d0..d998dba 100644 (file)
@@ -318,7 +318,7 @@ static void encode_block(NellyMoserEncodeContext *s, unsigned char *output, int
                        + s->mdct_out[i + NELLY_BUF_LEN] * s->mdct_out[i + NELLY_BUF_LEN];
         }
         cand[band] =
-            log(FFMAX(1.0, coeff_sum / (ff_nelly_band_sizes_table[band] << 7))) * 1024.0 / M_LN2;
+            log2(FFMAX(1.0, coeff_sum / (ff_nelly_band_sizes_table[band] << 7))) * 1024.0;
     }
 
     if (s->avctx->trellis) {