compress: Avoid PARA_ABS and PARA_MAX in inner loop.
[paraslash.git] / compress_filter.c
index 04377b7..cf55985 100644 (file)
@@ -75,8 +75,11 @@ next_buffer:
                op = para_malloc(length);
        for (i = 0; i < length / 2; i++) {
                /* be careful in that heat, my dear */
-               int sample = *ip++, adjusted_sample = (PARA_ABS(sample) *
-                       pcd->current_gain) >> gain_shift;
+               int sample = *ip++, adjusted_sample;
+
+               adjusted_sample = sample > 0? sample : -sample;
+               adjusted_sample *= pcd->current_gain;
+               adjusted_sample >>= gain_shift;
                if (adjusted_sample > 32767) { /* clip */
                        PARA_NOTICE_LOG("clip: sample: %d, adjusted sample: %d\n",
                                sample, adjusted_sample);
@@ -84,8 +87,8 @@ next_buffer:
                        pcd->current_gain = (3 * pcd->current_gain +
                                (1 << pcd->conf->inertia_arg)) / 4;
                        pcd->peak = 0;
-               } else
-                       pcd->peak = PARA_MAX(pcd->peak, adjusted_sample);
+               } else if (adjusted_sample > pcd->peak)
+                       pcd->peak = adjusted_sample;
                op[i] = sample >= 0? adjusted_sample : -adjusted_sample;
                if (++pcd->num_samples & mask)
                        continue;