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, 276 insertions, 0 deletions

diff --git a/third_party/aom/aom_dsp/bitreader.h b/third_party/aom/aom_dsp/bitreader.h
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+++ b/third_party/aom/aom_dsp/bitreader.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_BITREADER_H_
+#define AOM_DSP_BITREADER_H_
+
+#include <assert.h>
+#include <limits.h>
+
+#include "./aom_config.h"
+#if CONFIG_EC_ADAPT && !CONFIG_EC_MULTISYMBOL
+#error "CONFIG_EC_ADAPT is enabled without enabling CONFIG_EC_MULTISYMBOL."
+#endif
+
+#include "aom/aomdx.h"
+#include "aom/aom_integer.h"
+#if CONFIG_ANS
+#include "aom_dsp/ansreader.h"
+#elif CONFIG_DAALA_EC
+#include "aom_dsp/daalaboolreader.h"
+#else
+#include "aom_dsp/dkboolreader.h"
+#endif
+#include "aom_dsp/prob.h"
+#include "av1/common/odintrin.h"
+
+#if CONFIG_ACCOUNTING
+#include "av1/decoder/accounting.h"
+#define ACCT_STR_NAME acct_str
+#define ACCT_STR_PARAM , const char *ACCT_STR_NAME
+#define ACCT_STR_ARG(s) , s
+#else
+#define ACCT_STR_PARAM
+#define ACCT_STR_ARG(s)
+#endif
+
+#define aom_read(r, prob, ACCT_STR_NAME) \
+  aom_read_(r, prob ACCT_STR_ARG(ACCT_STR_NAME))
+#define aom_read_bit(r, ACCT_STR_NAME) \
+  aom_read_bit_(r ACCT_STR_ARG(ACCT_STR_NAME))
+#define aom_read_tree(r, tree, probs, ACCT_STR_NAME) \
+  aom_read_tree_(r, tree, probs ACCT_STR_ARG(ACCT_STR_NAME))
+#define aom_read_literal(r, bits, ACCT_STR_NAME) \
+  aom_read_literal_(r, bits ACCT_STR_ARG(ACCT_STR_NAME))
+#define aom_read_cdf(r, cdf, nsymbs, ACCT_STR_NAME) \
+  aom_read_cdf_(r, cdf, nsymbs ACCT_STR_ARG(ACCT_STR_NAME))
+#define aom_read_symbol(r, cdf, nsymbs, ACCT_STR_NAME) \
+  aom_read_symbol_(r, cdf, nsymbs ACCT_STR_ARG(ACCT_STR_NAME))
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if CONFIG_ANS
+typedef struct AnsDecoder aom_reader;
+#elif CONFIG_DAALA_EC
+typedef struct daala_reader aom_reader;
+#else
+typedef struct aom_dk_reader aom_reader;
+#endif
+
+static INLINE int aom_reader_init(aom_reader *r, const uint8_t *buffer,
+                                  size_t size, aom_decrypt_cb decrypt_cb,
+                                  void *decrypt_state) {
+#if CONFIG_ANS
+  (void)decrypt_cb;
+  (void)decrypt_state;
+  if (size > INT_MAX) return 1;
+  return ans_read_init(r, buffer, (int)size);
+#elif CONFIG_DAALA_EC
+  (void)decrypt_cb;
+  (void)decrypt_state;
+  return aom_daala_reader_init(r, buffer, (int)size);
+#else
+  return aom_dk_reader_init(r, buffer, size, decrypt_cb, decrypt_state);
+#endif
+}
+
+static INLINE const uint8_t *aom_reader_find_end(aom_reader *r) {
+#if CONFIG_ANS
+  (void)r;
+  assert(0 && "Use the raw buffer size with ANS");
+  return NULL;
+#elif CONFIG_DAALA_EC
+  return aom_daala_reader_find_end(r);
+#else
+  return aom_dk_reader_find_end(r);
+#endif
+}
+
+static INLINE int aom_reader_has_error(aom_reader *r) {
+#if CONFIG_ANS
+  return ans_reader_has_error(r);
+#elif CONFIG_DAALA_EC
+  return aom_daala_reader_has_error(r);
+#else
+  return aom_dk_reader_has_error(r);
+#endif
+}
+
+// Returns the position in the bit reader in bits.
+static INLINE uint32_t aom_reader_tell(const aom_reader *r) {
+#if CONFIG_ANS
+  (void)r;
+  assert(0 && "aom_reader_tell() is unimplemented for ANS");
+  return 0;
+#elif CONFIG_DAALA_EC
+  return aom_daala_reader_tell(r);
+#else
+  return aom_dk_reader_tell(r);
+#endif
+}
+
+// Returns the position in the bit reader in 1/8th bits.
+static INLINE uint32_t aom_reader_tell_frac(const aom_reader *r) {
+#if CONFIG_ANS
+  (void)r;
+  assert(0 && "aom_reader_tell_frac() is unimplemented for ANS");
+  return 0;
+#elif CONFIG_DAALA_EC
+  return aom_daala_reader_tell_frac(r);
+#else
+  return aom_dk_reader_tell_frac(r);
+#endif
+}
+
+#if CONFIG_ACCOUNTING
+static INLINE void aom_process_accounting(const aom_reader *r ACCT_STR_PARAM) {
+  if (r->accounting != NULL) {
+    uint32_t tell_frac;
+    tell_frac = aom_reader_tell_frac(r);
+    aom_accounting_record(r->accounting, ACCT_STR_NAME,
+                          tell_frac - r->accounting->last_tell_frac);
+    r->accounting->last_tell_frac = tell_frac;
+  }
+}
+
+static INLINE void aom_update_symb_counts(const aom_reader *r, int is_binary) {
+  if (r->accounting != NULL) {
+    r->accounting->syms.num_multi_syms += !is_binary;
+    r->accounting->syms.num_binary_syms += !!is_binary;
+  }
+}
+#endif
+
+static INLINE int aom_read_(aom_reader *r, int prob ACCT_STR_PARAM) {
+  int ret;
+#if CONFIG_ANS
+  ret = rabs_read(r, prob);
+#elif CONFIG_DAALA_EC
+  ret = aom_daala_read(r, prob);
+#else
+  ret = aom_dk_read(r, prob);
+#endif
+#if CONFIG_ACCOUNTING
+  if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME);
+  aom_update_symb_counts(r, 1);
+#endif
+  return ret;
+}
+
+static INLINE int aom_read_bit_(aom_reader *r ACCT_STR_PARAM) {
+  int ret;
+#if CONFIG_ANS
+  ret = rabs_read_bit(r);  // Non trivial optimization at half probability
+#elif CONFIG_DAALA_EC && CONFIG_RAWBITS
+  // Note this uses raw bits and is not the same as aom_daala_read(r, 128);
+  // Calls to this function are omitted from raw symbol accounting.
+  ret = aom_daala_read_bit(r);
+#else
+  ret = aom_read(r, 128, NULL);  // aom_prob_half
+#endif
+#if CONFIG_ACCOUNTING
+  if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME);
+#endif
+  return ret;
+}
+
+static INLINE int aom_read_literal_(aom_reader *r, int bits ACCT_STR_PARAM) {
+  int literal = 0, bit;
+
+  for (bit = bits - 1; bit >= 0; bit--) literal |= aom_read_bit(r, NULL) << bit;
+#if CONFIG_ACCOUNTING
+  if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME);
+#endif
+  return literal;
+}
+
+static INLINE int aom_read_tree_as_bits(aom_reader *r,
+                                        const aom_tree_index *tree,
+                                        const aom_prob *probs) {
+  aom_tree_index i = 0;
+
+  while ((i = tree[i + aom_read(r, probs[i >> 1], NULL)]) > 0) continue;
+  return -i;
+}
+
+#if CONFIG_EC_MULTISYMBOL
+static INLINE int aom_read_cdf_(aom_reader *r, const aom_cdf_prob *cdf,
+                                int nsymbs ACCT_STR_PARAM) {
+  int ret;
+#if CONFIG_ANS
+  (void)nsymbs;
+  ret = rans_read(r, cdf);
+#elif CONFIG_DAALA_EC
+  ret = daala_read_symbol(r, 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
+
+#if CONFIG_ACCOUNTING
+  if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME);
+  aom_update_symb_counts(r, (nsymbs == 2));
+#endif
+  return ret;
+}
+
+static INLINE int aom_read_symbol_(aom_reader *r, aom_cdf_prob *cdf,
+                                   int nsymbs ACCT_STR_PARAM) {
+  int ret;
+  ret = aom_read_cdf(r, cdf, nsymbs, ACCT_STR_NAME);
+#if CONFIG_EC_ADAPT
+  update_cdf(cdf, ret, nsymbs);
+#endif
+  return ret;
+}
+
+static INLINE int aom_read_tree_as_cdf(aom_reader *r,
+                                       const aom_tree_index *tree,
+                                       const aom_prob *probs) {
+  aom_tree_index i = 0;
+  do {
+    aom_cdf_prob cdf[16];
+    aom_tree_index index[16];
+    int path[16];
+    int dist[16];
+    int nsymbs;
+    int symb;
+    nsymbs = tree_to_cdf(tree, probs, i, cdf, index, path, dist);
+    symb = aom_read_cdf(r, cdf, nsymbs, NULL);
+    OD_ASSERT(symb >= 0 && symb < nsymbs);
+    i = index[symb];
+  } while (i > 0);
+  return -i;
+}
+#endif  // CONFIG_EC_MULTISYMBOL
+
+static INLINE int aom_read_tree_(aom_reader *r, const aom_tree_index *tree,
+                                 const aom_prob *probs ACCT_STR_PARAM) {
+  int ret;
+#if CONFIG_EC_MULTISYMBOL
+  ret = aom_read_tree_as_cdf(r, tree, probs);
+#else
+  ret = aom_read_tree_as_bits(r, tree, probs);
+#endif
+#if CONFIG_ACCOUNTING
+  if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME);
+#endif
+  return ret;
+}
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // AOM_DSP_BITREADER_H_