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qdm2: simplify arithmetic coder tables generation

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Someone should rename the variables, theres nothing random in there

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-03-06 04:56:33 +01:00
parent bb01be8046
commit 5c8ffbaa7f
1 changed files with 7 additions and 12 deletions
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19
libavcodec/qdm2_tablegen.h
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@ -54,8 +54,7 @@ static av_cold void softclip_table_init(void) {
// random generated table // random generated table
static av_cold void rnd_table_init(void) { static av_cold void rnd_table_init(void) {
int i,j; int i,j;
uint32_t ldw,hdw; uint32_t ldw;
uint64_t tmp64_1;
uint64_t random_seed = 0; uint64_t random_seed = 0;
float delta = 1.0 / 16384.0; float delta = 1.0 / 16384.0;
for(i = 0; i < 4096 ;i++) { for(i = 0; i < 4096 ;i++) {
@ -67,22 +66,18 @@ static av_cold void rnd_table_init(void) {
random_seed = 81; random_seed = 81;
ldw = i; ldw = i;
for (j = 0; j < 5 ;j++) { for (j = 0; j < 5 ;j++) {
random_dequant_index[i][j] = (uint8_t)((ldw / random_seed) & 0xFF); random_dequant_index[i][j] = ldw / random_seed;
ldw = (uint32_t)ldw % (uint32_t)random_seed; ldw %= random_seed;
tmp64_1 = (random_seed * 0x55555556); random_seed /= 3;
hdw = (uint32_t)(tmp64_1 >> 32);
random_seed = (uint64_t)(hdw + (ldw >> 31));
} }
} }
for (i = 0; i < 128 ;i++) { for (i = 0; i < 128 ;i++) {
random_seed = 25; random_seed = 25;
ldw = i; ldw = i;
for (j = 0; j < 3 ;j++) { for (j = 0; j < 3 ;j++) {
random_dequant_type24[i][j] = (uint8_t)((ldw / random_seed) & 0xFF); random_dequant_type24[i][j] = ldw / random_seed;
ldw = (uint32_t)ldw % (uint32_t)random_seed; ldw %= random_seed;
tmp64_1 = (random_seed * 0x66666667); random_seed /= 5;
hdw = (uint32_t)(tmp64_1 >> 33);
random_seed = hdw + (ldw >> 31);
} }
} }
} }