ec6fb649da
The (new) ans experiment replaces the bool coder with uABS bools. The 'rans' experiment adds multisymbol coding. This matches the setup in aom/master. Change-Id: Ida8372ccabf1e1e9afc45fe66362cda35a491222
126 lines
3.3 KiB
C
126 lines
3.3 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_BITWRITER_H_
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#define AOM_DSP_BITWRITER_H_
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#include <assert.h>
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#include "./aom_config.h"
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#if CONFIG_ANS
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#include "aom_dsp/buf_ans.h"
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#elif CONFIG_DAALA_EC
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#include "aom_dsp/daalaboolwriter.h"
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#else
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#include "aom_dsp/dkboolwriter.h"
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#endif
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#include "aom_dsp/prob.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 BufAnsCoder aom_writer;
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#elif CONFIG_DAALA_EC
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typedef struct daala_writer aom_writer;
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#else
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typedef struct aom_dk_writer aom_writer;
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#endif
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static INLINE void aom_start_encode(aom_writer *bc, uint8_t *buffer) {
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#if CONFIG_ANS
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(void)bc;
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(void)buffer;
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assert(0 && "buf_ans requires a more complicated startup procedure");
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#elif CONFIG_DAALA_EC
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aom_daala_start_encode(bc, buffer);
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#else
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aom_dk_start_encode(bc, buffer);
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#endif
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}
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static INLINE void aom_stop_encode(aom_writer *bc) {
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#if CONFIG_ANS
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(void)bc;
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assert(0 && "buf_ans requires a more complicated shutdown procedure");
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#elif CONFIG_DAALA_EC
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aom_daala_stop_encode(bc);
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#else
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aom_dk_stop_encode(bc);
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#endif
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}
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static INLINE void aom_write(aom_writer *br, int bit, int probability) {
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#if CONFIG_ANS
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buf_uabs_write(br, bit, probability);
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#elif CONFIG_DAALA_EC
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aom_daala_write(br, bit, probability);
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#else
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aom_dk_write(br, bit, probability);
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#endif
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}
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static INLINE void aom_write_bit(aom_writer *w, int bit) {
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aom_write(w, bit, 128); // aom_prob_half
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}
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static INLINE void aom_write_literal(aom_writer *w, int data, int bits) {
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int bit;
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for (bit = bits - 1; bit >= 0; bit--) aom_write_bit(w, 1 & (data >> bit));
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}
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static INLINE void aom_write_tree_bits(aom_writer *w, const aom_tree_index *tr,
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const aom_prob *probs, int bits, int len,
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aom_tree_index i) {
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do {
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const int bit = (bits >> --len) & 1;
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aom_write(w, bit, probs[i >> 1]);
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i = tr[i + bit];
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} while (len);
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}
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static INLINE void aom_write_tree(aom_writer *w, const aom_tree_index *tree,
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const aom_prob *probs, int bits, int len,
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aom_tree_index i) {
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#if CONFIG_DAALA_EC
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daala_write_tree_bits(w, tree, probs, bits, len, i);
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#else
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aom_write_tree_bits(w, tree, probs, bits, len, i);
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#endif
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}
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static INLINE void aom_write_symbol(aom_writer *w, int symb,
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const aom_cdf_prob *cdf, int nsymbs) {
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#if CONFIG_RANS
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struct rans_sym s;
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(void)nsymbs;
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assert(cdf);
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s.cum_prob = symb > 0 ? cdf[symb - 1] : 0;
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s.prob = cdf[symb] - s.cum_prob;
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buf_rans_write(w, &s);
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#elif CONFIG_DAALA_EC
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daala_write_symbol(w, symb, cdf, nsymbs);
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#else
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(void)w;
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(void)symb;
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(void)cdf;
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(void)nsymbs;
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assert(0 && "Unsupported bitwriter operation");
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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_BITWRITER_H_
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