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/common/scan.h

@@ -0,0 +1,95 @@
+/*
+ * 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_COMMON_SCAN_H_
+#define AV1_COMMON_SCAN_H_
+
+#include "aom/aom_integer.h"
+#include "aom_ports/mem.h"
+
+#include "av1/common/enums.h"
+#include "av1/common/onyxc_int.h"
+#include "av1/common/blockd.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define MAX_NEIGHBORS 2
+
+extern const SCAN_ORDER av1_default_scan_orders[TX_SIZES];
+extern const SCAN_ORDER av1_intra_scan_orders[TX_SIZES_ALL][TX_TYPES];
+extern const SCAN_ORDER av1_inter_scan_orders[TX_SIZES_ALL][TX_TYPES];
+
+#if CONFIG_ADAPT_SCAN
+void av1_update_scan_count_facade(AV1_COMMON *cm, FRAME_COUNTS *counts,
+                                  TX_SIZE tx_size, TX_TYPE tx_type,
+                                  const tran_low_t *dqcoeffs, int max_scan);
+
+// embed r + c and coeff_idx info with nonzero probabilities. When sorting the
+// nonzero probabilities, if there is a tie, the coefficient with smaller r + c
+// will be scanned first
+void av1_augment_prob(TX_SIZE tx_size, TX_TYPE tx_type, uint32_t *prob);
+
+// apply quick sort on nonzero probabilities to obtain a sort order
+void av1_update_sort_order(TX_SIZE tx_size, TX_TYPE tx_type,
+                           const uint32_t *non_zero_prob, int16_t *sort_order);
+
+// apply topological sort on the nonzero probabilities sorting order to
+// guarantee each to-be-scanned coefficient's upper and left coefficient will be
+// scanned before the to-be-scanned coefficient.
+void av1_update_scan_order(TX_SIZE tx_size, int16_t *sort_order, int16_t *scan,
+                           int16_t *iscan);
+
+// For each coeff_idx in scan[], update its above and left neighbors in
+// neighbors[] accordingly.
+void av1_update_neighbors(int tx_size, const int16_t *scan,
+                          const int16_t *iscan, int16_t *neighbors);
+void av1_init_scan_order(AV1_COMMON *cm);
+void av1_adapt_scan_order(AV1_COMMON *cm);
+#endif
+void av1_deliver_eob_threshold(const AV1_COMMON *cm, MACROBLOCKD *xd);
+
+static INLINE int get_coef_context(const int16_t *neighbors,
+                                   const uint8_t *token_cache, int c) {
+  return (1 + token_cache[neighbors[MAX_NEIGHBORS * c + 0]] +
+          token_cache[neighbors[MAX_NEIGHBORS * c + 1]]) >>
+         1;
+}
+
+static INLINE const SCAN_ORDER *get_default_scan(TX_SIZE tx_size,
+                                                 TX_TYPE tx_type,
+                                                 int is_inter) {
+#if CONFIG_EXT_TX || CONFIG_VAR_TX
+  return is_inter ? &av1_inter_scan_orders[tx_size][tx_type]
+                  : &av1_intra_scan_orders[tx_size][tx_type];
+#else
+  (void)is_inter;
+  return &av1_intra_scan_orders[tx_size][tx_type];
+#endif  // CONFIG_EXT_TX
+}
+
+static INLINE const SCAN_ORDER *get_scan(const AV1_COMMON *cm, TX_SIZE tx_size,
+                                         TX_TYPE tx_type, int is_inter) {
+#if CONFIG_ADAPT_SCAN
+  (void)is_inter;
+  return &cm->fc->sc[tx_size][tx_type];
+#else   // CONFIG_ADAPT_SCAN
+  (void)cm;
+  return get_default_scan(tx_size, tx_type, is_inter);
+#endif  // CONFIG_ADAPT_SCAN
+}
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // AV1_COMMON_SCAN_H_