compress: Adjust forumla for clipping
authorAndre <maan@p133.(none)>
Fri, 5 May 2006 12:30:57 +0000 (14:30 +0200)
committerAndre <maan@p133.(none)>
Fri, 5 May 2006 12:30:57 +0000 (14:30 +0200)
Use (3 * old + min) / 4 instead of (old + min) / 2 as the new gain
if clipping occures.

compress.c

index b4e4c40..3e605d0 100644 (file)
@@ -67,8 +67,8 @@ static ssize_t compress(char *inbuf, size_t inbuf_len, struct filter_node *fn)
                                >> gain_shift;
                        if (unlikely(adjusted_sample > 32767)) {
                                adjusted_sample = 32767;
-                               pcd->current_gain = (pcd->current_gain +
-                                       (1 << pcd->conf->inertia_arg)) / 2;
+                               pcd->current_gain = (3 * pcd->current_gain +
+                                       (1 << pcd->conf->inertia_arg)) / 4;
                                pcd->peak = 0;
                        } else
                                if (adjusted_sample > pcd->peak)
@@ -78,8 +78,8 @@ static ssize_t compress(char *inbuf, size_t inbuf_len, struct filter_node *fn)
                                >> gain_shift);
                        if (unlikely(adjusted_sample < -32768)) {
                                adjusted_sample = -32768;
-                               pcd->current_gain = (pcd->current_gain +
-                                       (1 << pcd->conf->inertia_arg)) / 2;
+                               pcd->current_gain = (3 * pcd->current_gain +
+                                       (1 << pcd->conf->inertia_arg)) / 4;
                                pcd->peak = 0;
                        } else
                                if (-adjusted_sample > pcd->peak)