commit 209821c7b7ead3ac58743d0a6d21dd05a2e77708
author Marco Nelissen <marcone@google.com> Tue Jan 18 16:44:28 2011 -0800
committer Marco Nelissen <marcone@google.com> Mon Jan 24 08:47:55 2011 -0800
tree e9cc0ea746bad9d05425f459ad245f882ceab36c
parent b517e006b51c95db9c44bf5f104f562d431ae597

Increase the number of useful bits in the spectrum.

Change-Id: I3efc2ac8db689285566df35cb6f594aab41141db

media/libmedia/Visualizer.cpp

diff --git a/media/libmedia/Visualizer.cpp b/media/libmedia/Visualizer.cpp
index a660429..43571cf 100644
--- a/media/libmedia/Visualizer.cpp
+++ b/media/libmedia/Visualizer.cpp
@@ -219,8 +219,13 @@
     }
 
     for (uint32_t i = 0; i < mCaptureSize; i += 2) {
-        fft[i] = workspace[i >> 1] >> 24;
-        fft[i + 1] = workspace[i >> 1] >> 8;
+        short tmp = workspace[i >> 1] >> 21;
+        while (tmp > 127 || tmp < -128) tmp >>= 1;
+        fft[i] = tmp;
+        tmp = workspace[i >> 1];
+        tmp >>= 5;
+        while (tmp > 127 || tmp < -128) tmp >>= 1;
+        fft[i + 1] = tmp;
     }
 
     return NO_ERROR;