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binkvideo: simplify and remove invalid shifts 

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2011-11-13 15:25:53 +00:00
parent 2625b621ce
commit 3f5d6a665a
1 changed files with 4 additions and 5 deletions
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9
libavcodec/bink.c
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@ -595,7 +595,7 @@ static int read_dct_coeffs(GetBitContext *gb, int32_t block[64], const uint8_t *
{
int coef_list[128];
int mode_list[128];
int i, t, mask, bits, ccoef, mode, sign;
int i, t, bits, ccoef, mode, sign;
int list_start = 64, list_end = 64, list_pos;
int coef_count = 0;
int coef_idx[64];
@ -609,8 +609,7 @@ static int read_dct_coeffs(GetBitContext *gb, int32_t block[64], const uint8_t *
coef_list[list_end] = 2; mode_list[list_end++] = 3;
coef_list[list_end] = 3; mode_list[list_end++] = 3;
bits = get_bits(gb, 4) - 1;
for (mask = 1 << bits; bits >= 0; mask >>= 1, bits--) {
for (bits = get_bits(gb, 4) - 1; bits >= 0; bits--) {
list_pos = list_start;
while (list_pos < list_end) {
if (!(mode_list[list_pos] | coef_list[list_pos]) || !get_bits1(gb)) {
@ -636,7 +635,7 @@ static int read_dct_coeffs(GetBitContext *gb, int32_t block[64], const uint8_t *
if (!bits) {
t = 1 - (get_bits1(gb) << 1);
} else {
t = get_bits(gb, bits) | mask;
t = get_bits(gb, bits) | 1 << bits;
sign = -get_bits1(gb);
t = (t ^ sign) - sign;
}
@ -657,7 +656,7 @@ static int read_dct_coeffs(GetBitContext *gb, int32_t block[64], const uint8_t *
if (!bits) {
t = 1 - (get_bits1(gb) << 1);
} else {
t = get_bits(gb, bits) | mask;
t = get_bits(gb, bits) | 1 << bits;
sign = -get_bits1(gb);
t = (t ^ sign) - sign;
}