ref: 87b689f97ac0d0bfc8b71188dafbee5e01adf1bd
parent: ada850786c7e0a5d6024b7716db9896124fd483e
author: Scott LaVarnway <slavarnway@google.com>
date: Fri Sep 23 01:03:52 EDT 2016
VP9: token decoder expansion This version is based on Change 267683, but does not use the macros. Change-Id: I0619fa618decf8bdeef250584d75d70318b5d9a7
--- a/vp9/decoder/vp9_detokenize.c
+++ b/vp9/decoder/vp9_detokenize.c
@@ -29,9 +29,45 @@
if (counts) ++coef_counts[band][ctx][token]; \
} while (0)
-static INLINE int read_coeff(const vpx_prob *probs, int n, vpx_reader *r) {+static INLINE int read_bool(vpx_reader *r, int prob, BD_VALUE *value,
+ int *count, unsigned int *range) {+ const unsigned int split = (*range * prob + (256 - prob)) >> CHAR_BIT;
+ const BD_VALUE bigsplit = (BD_VALUE)split << (BD_VALUE_SIZE - CHAR_BIT);
+
+ if (*count < 0) {+ r->value = *value;
+ r->count = *count;
+ vpx_reader_fill(r);
+ *value = r->value;
+ *count = r->count;
+ }
+
+ if (*value >= bigsplit) {+ *range = *range - split;
+ *value = *value - bigsplit;
+ {+ const int shift = vpx_norm[*range];
+ *range <<= shift;
+ *value <<= shift;
+ *count -= shift;
+ }
+ return 1;
+ }
+ *range = split;
+ {+ const int shift = vpx_norm[*range];
+ *range <<= shift;
+ *value <<= shift;
+ *count -= shift;
+ }
+ return 0;
+}
+
+static INLINE int read_coeff(vpx_reader *r, const vpx_prob *probs, int n,
+ BD_VALUE *value, int *count, unsigned int *range) {int i, val = 0;
- for (i = 0; i < n; ++i) val = (val << 1) | vpx_read(r, probs[i]);
+ for (i = 0; i < n; ++i)
+ val = (val << 1) | read_bool(r, probs[i], value, count, range);
return val;
}
@@ -52,7 +88,7 @@
uint8_t token_cache[32 * 32];
const uint8_t *band_translate = get_band_translate(tx_size);
const int dq_shift = (tx_size == TX_32X32);
- int v, token;
+ int v;
int16_t dqv = dq[0];
const uint8_t *const cat6_prob =
#if CONFIG_VP9_HIGHBITDEPTH
@@ -66,6 +102,11 @@
(xd->bd == VPX_BITS_12) ? 18 : (xd->bd == VPX_BITS_10) ? 16 :
#endif // CONFIG_VP9_HIGHBITDEPTH
14;
+ // Keep value, range, and count as locals. The compiler produces better
+ // results with the locals than using r directly.
+ BD_VALUE value = r->value;
+ unsigned int range = r->range;
+ int count = r->count;
if (counts) {coef_counts = counts->coef[tx_size][type][ref];
@@ -77,70 +118,98 @@
band = *band_translate++;
prob = coef_probs[band][ctx];
if (counts) ++eob_branch_count[band][ctx];
- if (!vpx_read(r, prob[EOB_CONTEXT_NODE])) {+ if (!read_bool(r, prob[EOB_CONTEXT_NODE], &value, &count, &range)) {INCREMENT_COUNT(EOB_MODEL_TOKEN);
break;
}
- while (!vpx_read(r, prob[ZERO_CONTEXT_NODE])) {+ while (!read_bool(r, prob[ZERO_CONTEXT_NODE], &value, &count, &range)) {INCREMENT_COUNT(ZERO_TOKEN);
dqv = dq[1];
token_cache[scan[c]] = 0;
++c;
- if (c >= max_eob) return c; // zero tokens at the end (no eob token)
+ if (c >= max_eob) {+ r->value = value;
+ r->range = range;
+ r->count = count;
+ return c; // zero tokens at the end (no eob token)
+ }
ctx = get_coef_context(nb, token_cache, c);
band = *band_translate++;
prob = coef_probs[band][ctx];
}
- if (!vpx_read(r, prob[ONE_CONTEXT_NODE])) {- INCREMENT_COUNT(ONE_TOKEN);
- token = ONE_TOKEN;
- val = 1;
- } else {+ if (read_bool(r, prob[ONE_CONTEXT_NODE], &value, &count, &range)) {+ const vpx_prob *p = vp9_pareto8_full[prob[PIVOT_NODE] - 1];
INCREMENT_COUNT(TWO_TOKEN);
- token = vpx_read_tree(r, vp9_coef_con_tree,
- vp9_pareto8_full[prob[PIVOT_NODE] - 1]);
- switch (token) {- case TWO_TOKEN:
- case THREE_TOKEN:
- case FOUR_TOKEN: val = token; break;
- case CATEGORY1_TOKEN:
- val = CAT1_MIN_VAL + read_coeff(vp9_cat1_prob, 1, r);
- break;
- case CATEGORY2_TOKEN:
- val = CAT2_MIN_VAL + read_coeff(vp9_cat2_prob, 2, r);
- break;
- case CATEGORY3_TOKEN:
- val = CAT3_MIN_VAL + read_coeff(vp9_cat3_prob, 3, r);
- break;
- case CATEGORY4_TOKEN:
- val = CAT4_MIN_VAL + read_coeff(vp9_cat4_prob, 4, r);
- break;
- case CATEGORY5_TOKEN:
- val = CAT5_MIN_VAL + read_coeff(vp9_cat5_prob, 5, r);
- break;
- case CATEGORY6_TOKEN:
- val = CAT6_MIN_VAL + read_coeff(cat6_prob, cat6_bits, r);
- break;
+ if (read_bool(r, p[0], &value, &count, &range)) {+ if (read_bool(r, p[3], &value, &count, &range)) {+ token_cache[scan[c]] = 5;
+ if (read_bool(r, p[5], &value, &count, &range)) {+ if (read_bool(r, p[7], &value, &count, &range)) {+ val = CAT6_MIN_VAL +
+ read_coeff(r, cat6_prob, cat6_bits, &value, &count, &range);
+ } else {+ val = CAT5_MIN_VAL +
+ read_coeff(r, vp9_cat5_prob, 5, &value, &count, &range);
+ }
+ } else if (read_bool(r, p[6], &value, &count, &range)) {+ val = CAT4_MIN_VAL +
+ read_coeff(r, vp9_cat4_prob, 4, &value, &count, &range);
+ } else {+ val = CAT3_MIN_VAL +
+ read_coeff(r, vp9_cat3_prob, 3, &value, &count, &range);
+ }
+ } else {+ token_cache[scan[c]] = 4;
+ if (read_bool(r, p[4], &value, &count, &range)) {+ val = CAT2_MIN_VAL +
+ read_coeff(r, vp9_cat2_prob, 2, &value, &count, &range);
+ } else {+ val = CAT1_MIN_VAL +
+ read_coeff(r, vp9_cat1_prob, 1, &value, &count, &range);
+ }
+ }
+ v = (val * dqv) >> dq_shift;
+ } else {+ if (read_bool(r, p[1], &value, &count, &range)) {+ token_cache[scan[c]] = 3;
+ v = ((3 + read_bool(r, p[2], &value, &count, &range)) * dqv) >>
+ dq_shift;
+ } else {+ token_cache[scan[c]] = 2;
+ v = (2 * dqv) >> dq_shift;
+ }
}
+ } else {+ INCREMENT_COUNT(ONE_TOKEN);
+ token_cache[scan[c]] = 1;
+ v = dqv >> dq_shift;
}
- v = (val * dqv) >> dq_shift;
#if CONFIG_COEFFICIENT_RANGE_CHECKING
#if CONFIG_VP9_HIGHBITDEPTH
- dqcoeff[scan[c]] = highbd_check_range((vpx_read_bit(r) ? -v : v), xd->bd);
+ dqcoeff[scan[c]] =
+ highbd_check_range(read_bool(r, 128, &value, &count, &range) ? -v : v),
+ xd->bd);
#else
- dqcoeff[scan[c]] = check_range(vpx_read_bit(r) ? -v : v);
+ dqcoeff[scan[c]] =
+ check_range(read_bool(r, 128, &value, &count, &range) ? -v : v);
#endif // CONFIG_VP9_HIGHBITDEPTH
#else
- dqcoeff[scan[c]] = vpx_read_bit(r) ? -v : v;
+ if (read_bool(r, 128, &value, &count, &range)) {+ dqcoeff[scan[c]] = -v;
+ } else {+ dqcoeff[scan[c]] = v;
+ }
#endif // CONFIG_COEFFICIENT_RANGE_CHECKING
- token_cache[scan[c]] = vp9_pt_energy_class[token];
++c;
ctx = get_coef_context(nb, token_cache, c);
dqv = dq[1];
}
+ r->value = value;
+ r->range = range;
+ r->count = count;
return c;
}