[FFmpeg-cvslog] qdm2: simplify arithmetic coder tables generation

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Wed Mar  6 04:56:33 2013 +0100| [5c8ffbaa7fe7ccba78ffe056d943910400af9508] | committer: Michael Niedermayer

qdm2: simplify arithmetic coder tables generation

Someone should rename the variables, theres nothing random in there

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5c8ffbaa7fe7ccba78ffe056d943910400af9508
---

 libavcodec/qdm2_tablegen.h |   19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/libavcodec/qdm2_tablegen.h b/libavcodec/qdm2_tablegen.h
index a90682f..13ec9be 100644
--- a/libavcodec/qdm2_tablegen.h
+++ b/libavcodec/qdm2_tablegen.h
@@ -54,8 +54,7 @@ static av_cold void softclip_table_init(void) {
 // random generated table
 static av_cold void rnd_table_init(void) {
     int i,j;
-    uint32_t ldw,hdw;
-    uint64_t tmp64_1;
+    uint32_t ldw;
     uint64_t random_seed = 0;
     float delta = 1.0 / 16384.0;
     for(i = 0; i < 4096 ;i++) {
@@ -67,22 +66,18 @@ static av_cold void rnd_table_init(void) {
         random_seed = 81;
         ldw = i;
         for (j = 0; j < 5 ;j++) {
-            random_dequant_index[i][j] = (uint8_t)((ldw / random_seed) & 0xFF);
-            ldw = (uint32_t)ldw % (uint32_t)random_seed;
-            tmp64_1 = (random_seed * 0x55555556);
-            hdw = (uint32_t)(tmp64_1 >> 32);
-            random_seed = (uint64_t)(hdw + (ldw >> 31));
+            random_dequant_index[i][j] = ldw / random_seed;
+            ldw %= random_seed;
+            random_seed /= 3;
         }
     }
     for (i = 0; i < 128 ;i++) {
         random_seed = 25;
         ldw = i;
         for (j = 0; j < 3 ;j++) {
-            random_dequant_type24[i][j] = (uint8_t)((ldw / random_seed) & 0xFF);
-            ldw = (uint32_t)ldw % (uint32_t)random_seed;
-            tmp64_1 = (random_seed * 0x66666667);
-            hdw = (uint32_t)(tmp64_1 >> 33);
-            random_seed = hdw + (ldw >> 31);
+            random_dequant_type24[i][j] = ldw / random_seed;
+            ldw %= random_seed;
+            random_seed /= 5;
         }
     }
 }