static int decode_term_subexp(vp9_reader *r) {
if (!vp9_read_bit(r))
return vp9_read_literal(r, 4);
if (!vp9_read_bit(r))
return vp9_read_literal(r, 4) + 16;
if (!vp9_read_bit(r))
return vp9_read_literal(r, 5) + 32;
return decode_uniform(r) + 64;
}
static void setup_txfm_mode(VP9_COMMON *pc, int lossless, vp9_reader *r) {
if (lossless) {
pc->txfm_mode = ONLY_4X4;
} else {
pc->txfm_mode = vp9_read_literal(r, 2);
if (pc->txfm_mode == ALLOW_32X32)
pc->txfm_mode += vp9_read_bit(r);
if (pc->txfm_mode == TX_MODE_SELECT) {
int i, j;
for (i = 0; i < TX_SIZE_CONTEXTS; ++i) {
for (j = 0; j < TX_SIZE_MAX_SB - 3; ++j) {
if (vp9_read(r, VP9_MODE_UPDATE_PROB))
pc->fc.tx_probs_8x8p[i][j] =
vp9_read_prob_diff_update(r, pc->fc.tx_probs_8x8p[i][j]);
}
}
for (i = 0; i < TX_SIZE_CONTEXTS; ++i) {
for (j = 0; j < TX_SIZE_MAX_SB - 2; ++j) {
if (vp9_read(r, VP9_MODE_UPDATE_PROB))
pc->fc.tx_probs_16x16p[i][j] =
vp9_read_prob_diff_update(r, pc->fc.tx_probs_16x16p[i][j]);
}
}
for (i = 0; i < TX_SIZE_CONTEXTS; ++i) {
for (j = 0; j < TX_SIZE_MAX_SB - 1; ++j) {
if (vp9_read(r, VP9_MODE_UPDATE_PROB))
pc->fc.tx_probs_32x32p[i][j] =
vp9_read_prob_diff_update(r, pc->fc.tx_probs_32x32p[i][j]);
}
}
}
}
}
static int decode_uniform(vp9_reader *r, int n) {
int v;
const int l = get_unsigned_bits(n);
const int m = (1 << l) - n;
if (!l)
return 0;
v = vp9_read_literal(r, l - 1);
return v < m ? v : (v << 1) - m + vp9_read_bit(r);
}
static int decode_term_subexp(vp9_reader *r, int k, int num_syms) {
int i = 0, mk = 0, word;
while (1) {
const int b = i ? k + i - 1 : k;
const int a = 1 << b;
if (num_syms <= mk + 3 * a) {
word = decode_uniform(r, num_syms - mk) + mk;
break;
} else {
if (vp9_read_bit(r)) {
i++;
mk += a;
} else {
word = vp9_read_literal(r, b) + mk;
break;
}
}
}
return word;
}
static int decode_uniform(vp9_reader *r) {
const int l = 8;
const int m = (1 << l) - 191;
const int v = vp9_read_literal(r, l - 1);
return v < m ? v : (v << 1) - m + vp9_read_bit(r);
}
static TX_MODE read_tx_mode(vp9_reader *r) {
TX_MODE tx_mode = vp9_read_literal(r, 2);
if (tx_mode == ALLOW_32X32)
tx_mode += vp9_read_bit(r);
return tx_mode;
}
static void update_mv(vp9_reader *r, vp9_prob *p) {
if (vp9_read(r, NMV_UPDATE_PROB))
*p = (vp9_read_literal(r, 7) << 1) | 1;
}
