Import aom library

This is the reference implementation for the Alliance for Open Media's av1 video code.

The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.

third_party/aom/av1/encoder/tokenize.h

@@ -0,0 +1,151 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#ifndef AV1_ENCODER_TOKENIZE_H_
+#define AV1_ENCODER_TOKENIZE_H_
+
+#include "av1/common/entropy.h"
+
+#include "av1/encoder/block.h"
+#include "av1/encoder/treewriter.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define EOSB_TOKEN 127  // Not signalled, encoder only
+
+#if CONFIG_HIGHBITDEPTH
+typedef int32_t EXTRABIT;
+#else
+typedef int16_t EXTRABIT;
+#endif
+
+typedef struct {
+  int16_t token;
+  EXTRABIT extra;
+} TOKENVALUE;
+
+typedef struct {
+#if CONFIG_NEW_TOKENSET
+  aom_cdf_prob (*tail_cdf)[CDF_SIZE(ENTROPY_TOKENS)];
+  aom_cdf_prob (*head_cdf)[CDF_SIZE(ENTROPY_TOKENS)];
+  int eob_val;
+  int first_val;
+#elif CONFIG_EC_MULTISYMBOL
+  aom_cdf_prob (*token_cdf)[CDF_SIZE(ENTROPY_TOKENS)];
+#endif
+  const aom_prob *context_tree;
+  EXTRABIT extra;
+  uint8_t token;
+  uint8_t skip_eob_node;
+} TOKENEXTRA;
+
+extern const aom_tree_index av1_coef_tree[];
+extern const aom_tree_index av1_coef_con_tree[];
+#if !CONFIG_EC_MULTISYMBOL
+extern const struct av1_token av1_coef_encodings[];
+#endif  // !CONFIG_EC_MULTISYMBOL
+
+int av1_is_skippable_in_plane(MACROBLOCK *x, BLOCK_SIZE bsize, int plane);
+
+struct AV1_COMP;
+struct ThreadData;
+
+typedef enum {
+  OUTPUT_ENABLED = 0,
+  DRY_RUN_NORMAL,
+  DRY_RUN_COSTCOEFFS,
+} RUN_TYPE;
+
+// Note in all the tokenize functions rate if non NULL is incremented
+// with the coefficient token cost only if dry_run = DRY_RUN_COSTCOEFS,
+// otherwise rate is not incremented.
+#if CONFIG_VAR_TX
+void av1_tokenize_sb_vartx(const struct AV1_COMP *cpi, struct ThreadData *td,
+                           TOKENEXTRA **t, RUN_TYPE dry_run, int mi_row,
+                           int mi_col, BLOCK_SIZE bsize, int *rate);
+#endif
+#if CONFIG_PALETTE
+void av1_tokenize_palette_sb(const struct AV1_COMP *cpi,
+                             const struct ThreadData *const td, int plane,
+                             TOKENEXTRA **t, RUN_TYPE dry_run, BLOCK_SIZE bsize,
+                             int *rate);
+#endif  // CONFIG_PALETTE
+void av1_tokenize_sb(const struct AV1_COMP *cpi, struct ThreadData *td,
+                     TOKENEXTRA **t, RUN_TYPE dry_run, BLOCK_SIZE bsize,
+                     int *rate, const int mi_row, const int mi_col);
+#if CONFIG_SUPERTX
+void av1_tokenize_sb_supertx(const struct AV1_COMP *cpi, struct ThreadData *td,
+                             TOKENEXTRA **t, RUN_TYPE dry_run, BLOCK_SIZE bsize,
+                             int *rate);
+#endif
+
+extern const int16_t *av1_dct_value_cost_ptr;
+/* TODO: The Token field should be broken out into a separate char array to
+ *  improve cache locality, since it's needed for costing when the rest of the
+ *  fields are not.
+ */
+extern const TOKENVALUE *av1_dct_value_tokens_ptr;
+extern const TOKENVALUE *av1_dct_cat_lt_10_value_tokens;
+extern const int *av1_dct_cat_lt_10_value_cost;
+extern const int16_t av1_cat6_low_cost[256];
+#if CONFIG_HIGHBITDEPTH
+#define CAT6_HIGH_COST_ENTRIES 1024
+#else
+#define CAT6_HIGH_COST_ENTRIES 64
+#endif
+extern const int av1_cat6_high_cost[CAT6_HIGH_COST_ENTRIES];
+extern const uint8_t av1_cat6_skipped_bits_discount[8];
+
+static INLINE void av1_get_token_extra(int v, int16_t *token, EXTRABIT *extra) {
+  if (v >= CAT6_MIN_VAL || v <= -CAT6_MIN_VAL) {
+    *token = CATEGORY6_TOKEN;
+    if (v >= CAT6_MIN_VAL)
+      *extra = 2 * v - 2 * CAT6_MIN_VAL;
+    else
+      *extra = -2 * v - 2 * CAT6_MIN_VAL + 1;
+    return;
+  }
+  *token = av1_dct_cat_lt_10_value_tokens[v].token;
+  *extra = av1_dct_cat_lt_10_value_tokens[v].extra;
+}
+static INLINE int16_t av1_get_token(int v) {
+  if (v >= CAT6_MIN_VAL || v <= -CAT6_MIN_VAL) return 10;
+  return av1_dct_cat_lt_10_value_tokens[v].token;
+}
+
+static INLINE int av1_get_token_cost(int v, int16_t *token, int cat6_bits) {
+  if (v >= CAT6_MIN_VAL || v <= -CAT6_MIN_VAL) {
+    EXTRABIT extrabits;
+    *token = CATEGORY6_TOKEN;
+    extrabits = abs(v) - CAT6_MIN_VAL;
+    return av1_cat6_low_cost[extrabits & 0xff] +
+           av1_cat6_high_cost[extrabits >> 8] -
+           av1_cat6_skipped_bits_discount[18 - cat6_bits];
+  }
+  *token = av1_dct_cat_lt_10_value_tokens[v].token;
+  return av1_dct_cat_lt_10_value_cost[v];
+}
+
+#if !CONFIG_PVQ || CONFIG_VAR_TX
+static INLINE int get_tx_eob(const struct segmentation *seg, int segment_id,
+                             TX_SIZE tx_size) {
+  const int eob_max = tx_size_2d[tx_size];
+  return segfeature_active(seg, segment_id, SEG_LVL_SKIP) ? 0 : eob_max;
+}
+#endif
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // AV1_ENCODER_TOKENIZE_H_