From: Andre <maan@p133.(none)>
Date: Fri, 5 May 2006 12:30:57 +0000 (+0200)
Subject: compress: Adjust forumla for clipping
X-Git-Tag: v0.2.12~12
X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=commitdiff_plain;h=aab63ef382a98dd47bd9c41338ab852dc84a725d

compress: Adjust forumla for clipping

Use (3 * old + min) / 4 instead of (old + min) / 2 as the new gain
if clipping occures.
---

diff --git a/compress.c b/compress.c
index b4e4c40a..3e605d0e 100644
--- a/compress.c
+++ b/compress.c
@@ -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)