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/aom_dsp/binary_codes_writer.h

@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2017, 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_BINARY_CODES_WRITER_H_
+#define AOM_DSP_BINARY_CODES_WRITER_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <assert.h>
+#include "./aom_config.h"
+#include "aom/aom_integer.h"
+#include "aom_dsp/bitwriter.h"
+
+// Codes a symbol v in [-2^mag_bits, 2^mag_bits]
+// mag_bits is number of bits for magnitude. The alphabet is of size
+// 2 * 2^mag_bits + 1, symmetric around 0, where one bit is used to
+// indicate 0 or non-zero, mag_bits bits are used to indicate magnitide
+// and 1 more bit for the sign if non-zero.
+void aom_write_primitive_symmetric(aom_writer *w, int16_t v,
+                                   unsigned int mag_bits);
+
+// Encodes a value v in [0, n-1] quasi-uniformly
+void aom_write_primitive_quniform(aom_writer *w, uint16_t n, uint16_t v);
+
+// Encodes a value v in [0, n-1] based on a reference ref also in [0, n-1]
+// The closest p values of v from ref are coded using a p-ary quasi-unoform
+// short code while the remaining n-p values are coded with a longer code.
+void aom_write_primitive_refbilevel(aom_writer *w, uint16_t n, uint16_t p,
+                                    uint16_t ref, uint16_t v);
+
+// Finite subexponential code that codes a symbol v in [0, n-1] with parameter k
+void aom_write_primitive_subexpfin(aom_writer *w, uint16_t n, uint16_t k,
+                                   uint16_t v);
+
+// Finite subexponential code that codes a symbol v in [0, n-1] with parameter k
+// based on a reference ref also in [0, n-1].
+void aom_write_primitive_refsubexpfin(aom_writer *w, uint16_t n, uint16_t k,
+                                      uint16_t ref, uint16_t v);
+
+// Finite subexponential code that codes a symbol v in [-(n-1), n-1] with
+// parameter k based on a reference ref also in [-(n-1), n-1].
+void aom_write_signed_primitive_refsubexpfin(aom_writer *w, uint16_t n,
+                                             uint16_t k, int16_t ref,
+                                             int16_t v);
+
+// Functions that counts bits for the above primitives
+int aom_count_primitive_symmetric(int16_t v, unsigned int mag_bits);
+int aom_count_primitive_quniform(uint16_t n, uint16_t v);
+int aom_count_primitive_refbilevel(uint16_t n, uint16_t p, uint16_t ref,
+                                   uint16_t v);
+int aom_count_primitive_subexpfin(uint16_t n, uint16_t k, uint16_t v);
+int aom_count_primitive_refsubexpfin(uint16_t n, uint16_t k, uint16_t ref,
+                                     uint16_t v);
+int aom_count_signed_primitive_refsubexpfin(uint16_t n, uint16_t k, int16_t ref,
+                                            int16_t v);
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // AOM_DSP_BINARY_CODES_WRITER_H_