121 строка
3.4 KiB
C
121 строка
3.4 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_DAALABOOLWRITER_H_
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#define AOM_DSP_DAALABOOLWRITER_H_
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#include <stdio.h>
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#include "aom_dsp/entenc.h"
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#include "aom_dsp/prob.h"
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#if CONFIG_BITSTREAM_DEBUG
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#include "aom_util/debug_util.h"
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#endif // CONFIG_BITSTREAM_DEBUG
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct daala_writer {
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unsigned int pos;
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uint8_t *buffer;
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od_ec_enc ec;
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};
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typedef struct daala_writer daala_writer;
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void aom_daala_start_encode(daala_writer *w, uint8_t *buffer);
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void aom_daala_stop_encode(daala_writer *w);
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static INLINE void aom_daala_write(daala_writer *w, int bit, int prob) {
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int p = ((prob << 15) + (256 - prob)) >> 8;
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#if CONFIG_BITSTREAM_DEBUG
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aom_cdf_prob cdf[2] = { (aom_cdf_prob)p, 32767 };
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/*int queue_r = 0;
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int frame_idx_r = 0;
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int queue_w = bitstream_queue_get_write();
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int frame_idx_w = bitstream_queue_get_frame_write();
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if (frame_idx_w == frame_idx_r && queue_w == queue_r) {
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fprintf(stderr, "\n *** bitstream queue at frame_idx_w %d queue_w %d\n",
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frame_idx_w, queue_w);
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}*/
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bitstream_queue_push(bit, cdf, 2);
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#endif
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od_ec_encode_bool_q15(&w->ec, bit, p);
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}
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static INLINE void aom_daala_write_bit(daala_writer *w, int bit) {
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od_ec_enc_bits(&w->ec, bit, 1);
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}
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static INLINE void daala_write_symbol(daala_writer *w, int symb,
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const aom_cdf_prob *cdf, int nsymbs) {
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#if CONFIG_BITSTREAM_DEBUG
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/*int queue_r = 0;
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int frame_idx_r = 0;
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int queue_w = bitstream_queue_get_write();
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int frame_idx_w = bitstream_queue_get_frame_write();
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if (frame_idx_w == frame_idx_r && queue_w == queue_r) {
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fprintf(stderr, "\n *** bitstream queue at frame_idx_w %d queue_w %d\n",
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frame_idx_w, queue_w);
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}*/
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bitstream_queue_push(symb, cdf, nsymbs);
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#endif
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od_ec_encode_cdf_q15(&w->ec, symb, cdf, nsymbs);
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}
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static INLINE void daala_write_tree_bits(daala_writer *w,
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const aom_tree_index *tree,
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const aom_prob *probs, int bits,
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int len, aom_tree_index i) {
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aom_tree_index root;
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root = i;
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do {
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aom_cdf_prob cdf[16];
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aom_tree_index index[16];
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int path[16];
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int dist[16];
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int nsymbs;
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int symb;
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int j;
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/* Compute the CDF of the binary tree using the given probabilities. */
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nsymbs = tree_to_cdf(tree, probs, root, cdf, index, path, dist);
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/* Find the symbol to code. */
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symb = -1;
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for (j = 0; j < nsymbs; j++) {
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/* If this symbol codes a leaf node, */
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if (index[j] <= 0) {
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if (len == dist[j] && path[j] == bits) {
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symb = j;
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break;
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}
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} else {
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if (len > dist[j] && path[j] == bits >> (len - dist[j])) {
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symb = j;
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break;
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}
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}
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}
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OD_ASSERT(symb != -1);
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daala_write_symbol(w, symb, cdf, nsymbs);
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bits &= (1 << (len - dist[symb])) - 1;
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len -= dist[symb];
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} while (len);
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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
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