shithub: aubio

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fix underflowing index in beat tracking logic

--- a/src/tempo/beattracking.c

+++ b/src/tempo/beattracking.c

@@ -269,14 +269,14 @@

   if (gp < 2) return 4;

   if (acflen > 6 * gp + 2) {

     for (k = -2; k < 2; k++) {

-      three_energy += acf->data[3 * gp + k];

-      four_energy += acf->data[4 * gp + k];

+      three_energy += acf->data[3 * (int)gp + k];

+      four_energy += acf->data[4 * (int)gp + k];

     }

   } else {

     /*Expanded to be more accurate in time sig estimation */

     for (k = -2; k < 2; k++) {

-      three_energy += acf->data[3 * gp + k] + acf->data[6 * gp + k];

-      four_energy += acf->data[4 * gp + k] + acf->data[2 * gp + k];

+      three_energy += acf->data[3 * (int)gp + k] + acf->data[6 * (int)gp + k];

+      four_energy += acf->data[4 * (int)gp + k] + acf->data[2 * (int)gp + k];

     }

   }

   return (three_energy > four_energy) ? 3 : 4;