shithub: aacenc

Info  •  Files  •  Log

a better way to balance band volume

--- a/libfaac/quantize.c

+++ b/libfaac/quantize.c

@@ -82,7 +82,7 @@

         target *= 0.45;

     }

-    bandqual[sfb] = 3.0 * target * quality;

+    bandqual[sfb] = 3.5 * target * quality;

   }

 }

@@ -134,9 +134,19 @@

       coderInfo->scale_factor[sb] = sfac;

       for (cnt = start; cnt < end; cnt++)

       {

+          int x0, x1;

+          double err0, err1;

           double tmp = fabs(xr[cnt]) * sfacfix;

           tmp = sqrt(tmp * sqrt(tmp));

-          xi[cnt] = (int)(tmp + 0.2);

+          x0 = tmp;

+          x1 = x0 + 1;

+          err0 = fabs(tmp * tmp - x0 * x0);

+          err1 = fabs(tmp * tmp - x1 * x1);

+

+          if (err0 < err1)

+              xi[cnt] = x0;

+          else

+              xi[cnt] = x1;

       }

     }

 }