Import aom library

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

The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.

1 files changed, 255 insertions, 0 deletions

diff --git a/third_party/aom/aom_dsp/bitwriter.h b/third_party/aom/aom_dsp/bitwriter.h
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+++ b/third_party/aom/aom_dsp/bitwriter.h
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+/*
+ * 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 AOM_DSP_BITWRITER_H_
+#define AOM_DSP_BITWRITER_H_
+
+#include <assert.h>
+#include "./aom_config.h"
+#if CONFIG_EC_ADAPT && !CONFIG_EC_MULTISYMBOL
+#error "CONFIG_EC_ADAPT is enabled without enabling CONFIG_EC_MULTISYMBOL"
+#endif
+
+#if CONFIG_ANS
+#include "aom_dsp/buf_ans.h"
+#elif CONFIG_DAALA_EC
+#include "aom_dsp/daalaboolwriter.h"
+#else
+#include "aom_dsp/dkboolwriter.h"
+#endif
+#include "aom_dsp/prob.h"
+
+#if CONFIG_RD_DEBUG
+#include "av1/common/blockd.h"
+#include "av1/encoder/cost.h"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if CONFIG_ANS
+typedef struct BufAnsCoder aom_writer;
+#elif CONFIG_DAALA_EC
+typedef struct daala_writer aom_writer;
+#else
+typedef struct aom_dk_writer aom_writer;
+#endif
+
+typedef struct TOKEN_STATS {
+  int cost;
+#if CONFIG_VAR_TX
+#if CONFIG_RD_DEBUG
+  int txb_coeff_cost_map[TXB_COEFF_COST_MAP_SIZE][TXB_COEFF_COST_MAP_SIZE];
+#endif
+#endif
+} TOKEN_STATS;
+
+static INLINE void init_token_stats(TOKEN_STATS *token_stats) {
+#if CONFIG_VAR_TX
+#if CONFIG_RD_DEBUG
+  int r, c;
+  for (r = 0; r < TXB_COEFF_COST_MAP_SIZE; ++r) {
+    for (c = 0; c < TXB_COEFF_COST_MAP_SIZE; ++c) {
+      token_stats->txb_coeff_cost_map[r][c] = 0;
+    }
+  }
+#endif
+#endif
+  token_stats->cost = 0;
+}
+
+static INLINE void aom_start_encode(aom_writer *bc, uint8_t *buffer) {
+#if CONFIG_ANS
+  (void)bc;
+  (void)buffer;
+  assert(0 && "buf_ans requires a more complicated startup procedure");
+#elif CONFIG_DAALA_EC
+  aom_daala_start_encode(bc, buffer);
+#else
+  aom_dk_start_encode(bc, buffer);
+#endif
+}
+
+static INLINE void aom_stop_encode(aom_writer *bc) {
+#if CONFIG_ANS
+  (void)bc;
+  assert(0 && "buf_ans requires a more complicated shutdown procedure");
+#elif CONFIG_DAALA_EC
+  aom_daala_stop_encode(bc);
+#else
+  aom_dk_stop_encode(bc);
+#endif
+}
+
+static INLINE void aom_write(aom_writer *br, int bit, int probability) {
+#if CONFIG_ANS
+  buf_rabs_write(br, bit, probability);
+#elif CONFIG_DAALA_EC
+  aom_daala_write(br, bit, probability);
+#else
+  aom_dk_write(br, bit, probability);
+#endif
+}
+
+static INLINE void aom_write_record(aom_writer *br, int bit, int probability,
+                                    TOKEN_STATS *token_stats) {
+  aom_write(br, bit, probability);
+#if CONFIG_RD_DEBUG
+  token_stats->cost += av1_cost_bit(probability, bit);
+#else
+  (void)token_stats;
+#endif
+}
+
+static INLINE void aom_write_bit(aom_writer *w, int bit) {
+#if CONFIG_ANS
+  buf_rabs_write_bit(w, bit);
+#elif CONFIG_DAALA_EC && CONFIG_RAWBITS
+  // Note this uses raw bits and is not the same as aom_daala_write(r, 128);
+  aom_daala_write_bit(w, bit);
+#else
+  aom_write(w, bit, 128);  // aom_prob_half
+#endif
+}
+
+static INLINE void aom_write_bit_record(aom_writer *w, int bit,
+                                        TOKEN_STATS *token_stats) {
+  aom_write_bit(w, bit);
+#if CONFIG_RD_DEBUG
+  token_stats->cost += av1_cost_bit(128, bit);  // aom_prob_half
+#else
+  (void)token_stats;
+#endif
+}
+
+static INLINE void aom_write_literal(aom_writer *w, int data, int bits) {
+  int bit;
+
+  for (bit = bits - 1; bit >= 0; bit--) aom_write_bit(w, 1 & (data >> bit));
+}
+
+static INLINE void aom_write_tree_as_bits(aom_writer *w,
+                                          const aom_tree_index *tr,
+                                          const aom_prob *probs, int bits,
+                                          int len, aom_tree_index i) {
+  do {
+    const int bit = (bits >> --len) & 1;
+    aom_write(w, bit, probs[i >> 1]);
+    i = tr[i + bit];
+  } while (len);
+}
+
+static INLINE void aom_write_tree_as_bits_record(
+    aom_writer *w, const aom_tree_index *tr, const aom_prob *probs, int bits,
+    int len, aom_tree_index i, TOKEN_STATS *token_stats) {
+  do {
+    const int bit = (bits >> --len) & 1;
+    aom_write_record(w, bit, probs[i >> 1], token_stats);
+    i = tr[i + bit];
+  } while (len);
+}
+
+#if CONFIG_EC_MULTISYMBOL
+static INLINE void aom_write_cdf(aom_writer *w, int symb,
+                                 const aom_cdf_prob *cdf, int nsymbs) {
+#if CONFIG_ANS
+  (void)nsymbs;
+  assert(cdf);
+  const aom_cdf_prob cum_prob = symb > 0 ? cdf[symb - 1] : 0;
+  const aom_cdf_prob prob = cdf[symb] - cum_prob;
+  buf_rans_write(w, cum_prob, prob);
+#elif CONFIG_DAALA_EC
+  daala_write_symbol(w, symb, cdf, nsymbs);
+#else
+#error \
+    "CONFIG_EC_MULTISYMBOL is selected without a valid backing entropy " \
+  "coder. Enable daala_ec or ans for a valid configuration."
+#endif
+}
+
+static INLINE void aom_write_symbol(aom_writer *w, int symb, aom_cdf_prob *cdf,
+                                    int nsymbs) {
+  aom_write_cdf(w, symb, cdf, nsymbs);
+#if CONFIG_EC_ADAPT
+  update_cdf(cdf, symb, nsymbs);
+#endif
+}
+
+static INLINE void aom_write_tree_as_cdf(aom_writer *w,
+                                         const aom_tree_index *tree,
+                                         const aom_prob *probs, int bits,
+                                         int len, aom_tree_index i) {
+  aom_tree_index root;
+  root = i;
+  do {
+    aom_cdf_prob cdf[16];
+    aom_tree_index index[16];
+    int path[16];
+    int dist[16];
+    int nsymbs;
+    int symb;
+    int j;
+    /* Compute the CDF of the binary tree using the given probabilities. */
+    nsymbs = tree_to_cdf(tree, probs, root, cdf, index, path, dist);
+    /* Find the symbol to code. */
+    symb = -1;
+    for (j = 0; j < nsymbs; j++) {
+      /* If this symbol codes a leaf node,  */
+      if (index[j] <= 0) {
+        if (len == dist[j] && path[j] == bits) {
+          symb = j;
+          break;
+        }
+      } else {
+        if (len > dist[j] && path[j] == bits >> (len - dist[j])) {
+          symb = j;
+          break;
+        }
+      }
+    }
+    OD_ASSERT(symb != -1);
+    aom_write_cdf(w, symb, cdf, nsymbs);
+    bits &= (1 << (len - dist[symb])) - 1;
+    len -= dist[symb];
+  } while (len);
+}
+
+#endif  // CONFIG_EC_MULTISYMBOL
+
+static INLINE void aom_write_tree(aom_writer *w, const aom_tree_index *tree,
+                                  const aom_prob *probs, int bits, int len,
+                                  aom_tree_index i) {
+#if CONFIG_EC_MULTISYMBOL
+  aom_write_tree_as_cdf(w, tree, probs, bits, len, i);
+#else
+  aom_write_tree_as_bits(w, tree, probs, bits, len, i);
+#endif
+}
+
+static INLINE void aom_write_tree_record(aom_writer *w,
+                                         const aom_tree_index *tree,
+                                         const aom_prob *probs, int bits,
+                                         int len, aom_tree_index i,
+                                         TOKEN_STATS *token_stats) {
+#if CONFIG_EC_MULTISYMBOL
+  (void)token_stats;
+  aom_write_tree_as_cdf(w, tree, probs, bits, len, i);
+#else
+  aom_write_tree_as_bits_record(w, tree, probs, bits, len, i, token_stats);
+#endif
+}
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // AOM_DSP_BITWRITER_H_