[SCM] libav/experimental: bring back some randomness in fft-test. (regression in r18070)

[siretart at users.alioth.debian.org]

The following commit has been merged in the experimental branch:
commit 50b1785a578a44124877c4fe93e21c0c9376446b
Author: Loren Merritt <lorenm at u.washington.edu>
Date:   Sat Aug 22 15:56:06 2009 +0000

    bring back some randomness in fft-test. (regression in r18070)
    
    Originally committed as revision 19679 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/fft-test.c b/libavcodec/fft-test.c
index 421f8bb..3da7a23 100644
--- a/libavcodec/fft-test.c
+++ b/libavcodec/fft-test.c
@@ -129,11 +129,9 @@ static void mdct_ref(float *output, float *input, int nbits)
 }
 
 
-static float frandom(void)
+static float frandom(AVLFG *prng)
 {
-    AVLFG prng;
-    av_lfg_init(&prng, 1);
-    return (float)((av_lfg_get(&prng) & 0xffff) - 32768) / 32768.0;
+    return (int16_t)av_lfg_get(prng) / 32768.0;
 }
 
 static int64_t gettime(void)
@@ -189,6 +187,8 @@ int main(int argc, char **argv)
     MDCTContext m1, *m = &m1;
     int fft_nbits, fft_size;
     double scale = 1.0;
+    AVLFG prng;
+    av_lfg_init(&prng, 1);
 
     fft_nbits = 9;
     for(;;) {
@@ -243,8 +243,8 @@ int main(int argc, char **argv)
     /* generate random data */
 
     for(i=0;i<fft_size;i++) {
-        tab1[i].re = frandom();
-        tab1[i].im = frandom();
+        tab1[i].re = frandom(&prng);
+        tab1[i].im = frandom(&prng);
     }
 
     /* checking result */

-- 
Libav/FFmpeg packaging