add clipping to RC update

Signed-off-by: Minsoo Park <mss.park@samsung.com>

Author: mss-park

src/oapv_rc.c

@@ -199,6 +199,9 @@ void oapve_rc_update_after_pic(oapve_ctx_t* ctx, double cost)
         diff_lambda = oapv_clip3(-0.125, 0.125, 0.25 * diff_lambda);
         ctx->rc_param.alpha = (ctx->rc_param.alpha) * exp(diff_lambda);
         ctx->rc_param.beta = (ctx->rc_param.beta) + diff_lambda / ln_bpp;
+
+        ctx->rc_param.alpha = oapv_clip3(0.05, 500, ctx->rc_param.alpha);
+        ctx->rc_param.beta = oapv_clip3(0.1, 3, ctx->rc_param.beta);
     }
     ctx->rc_param.is_updated = 1;
 }