155 строки
3.8 KiB
C
155 строки
3.8 KiB
C
/*
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* Copyright (c) 2016, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#ifndef AOM_DSP_BITREADER_H_
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#define AOM_DSP_BITREADER_H_
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#include <stddef.h>
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#include <limits.h>
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#include "./aom_config.h"
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#include "aom/aomdx.h"
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#include "aom/aom_integer.h"
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#if CONFIG_ANS
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#include "aom_dsp/ansreader.h"
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#elif CONFIG_DAALA_EC
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#include "aom_dsp/daalaboolreader.h"
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#else
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#include "aom_dsp/dkboolreader.h"
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#endif
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#include "aom_dsp/prob.h"
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#include "av1/common/odintrin.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if CONFIG_ANS
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typedef struct AnsDecoder aom_reader;
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#elif CONFIG_DAALA_EC
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typedef struct daala_reader aom_reader;
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#else
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typedef struct aom_dk_reader aom_reader;
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#endif
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static INLINE int aom_reader_init(aom_reader *r, const uint8_t *buffer,
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size_t size, aom_decrypt_cb decrypt_cb,
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void *decrypt_state) {
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#if CONFIG_ANS
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(void)decrypt_cb;
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(void)decrypt_state;
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assert(size <= INT_MAX);
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return ans_read_init(r, buffer, size);
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#elif CONFIG_DAALA_EC
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(void)decrypt_cb;
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(void)decrypt_state;
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return aom_daala_reader_init(r, buffer, size);
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#else
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return aom_dk_reader_init(r, buffer, size, decrypt_cb, decrypt_state);
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#endif
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}
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static INLINE const uint8_t *aom_reader_find_end(aom_reader *r) {
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#if CONFIG_ANS
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(void)r;
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assert(0 && "Use the raw buffer size with ANS");
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return NULL;
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#elif CONFIG_DAALA_EC
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return aom_daala_reader_find_end(r);
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#else
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return aom_dk_reader_find_end(r);
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#endif
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}
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static INLINE int aom_reader_has_error(aom_reader *r) {
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#if CONFIG_ANS
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return ans_reader_has_error(r);
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#elif CONFIG_DAALA_EC
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return aom_daala_reader_has_error(r);
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#else
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return aom_dk_reader_has_error(r);
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#endif
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}
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static INLINE ptrdiff_t aom_reader_tell(const aom_reader *r) {
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#if CONFIG_DAALA_EC
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return aom_daala_reader_tell(r);
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#else
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return aom_dk_reader_tell(r);
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#endif
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}
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static INLINE int aom_read(aom_reader *r, int prob) {
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#if CONFIG_ANS
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return uabs_read(r, prob);
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#elif CONFIG_DAALA_EC
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return aom_daala_read(r, prob);
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#else
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return aom_dk_read(r, prob);
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#endif
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}
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static INLINE int aom_read_bit(aom_reader *r) {
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#if CONFIG_ANS
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return uabs_read_bit(r); // Non trivial optimization at half probability
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#else
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return aom_read(r, 128); // aom_prob_half
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#endif
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}
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static INLINE int aom_read_literal(aom_reader *r, int bits) {
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int literal = 0, bit;
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for (bit = bits - 1; bit >= 0; bit--) literal |= aom_read_bit(r) << bit;
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return literal;
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}
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static INLINE int aom_read_tree_bits(aom_reader *r, const aom_tree_index *tree,
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const aom_prob *probs) {
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aom_tree_index i = 0;
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while ((i = tree[i + aom_read(r, probs[i >> 1])]) > 0) continue;
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return -i;
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}
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static INLINE int aom_read_tree(aom_reader *r, const aom_tree_index *tree,
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const aom_prob *probs) {
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#if CONFIG_DAALA_EC
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return daala_read_tree_bits(r, tree, probs);
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#else
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return aom_read_tree_bits(r, tree, probs);
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#endif
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}
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static INLINE int aom_read_symbol(aom_reader *r, const aom_cdf_prob *cdf,
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int nsymbs) {
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#if CONFIG_RANS
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(void)nsymbs;
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return rans_read(r, cdf);
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#elif CONFIG_DAALA_EC
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return daala_read_symbol(r, cdf, nsymbs);
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#else
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(void)r;
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(void)cdf;
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(void)nsymbs;
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assert(0 && "Unsupported bitreader operation");
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return -1;
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#endif
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}
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // AOM_DSP_BITREADER_H_
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