105 строки
2.5 KiB
C
105 строки
2.5 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_DKBOOLWRITER_H_
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#define AOM_DSP_DKBOOLWRITER_H_
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#include "./aom_config.h"
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#if CONFIG_BITSTREAM_DEBUG
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#include <stdio.h>
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#include "aom_util/debug_util.h"
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#endif // CONFIG_BITSTREAM_DEBUG
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#include "aom_dsp/prob.h"
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#include "aom_ports/mem.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct aom_dk_writer {
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unsigned int lowvalue;
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unsigned int range;
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int count;
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unsigned int pos;
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uint8_t *buffer;
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} aom_dk_writer;
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void aom_dk_start_encode(aom_dk_writer *bc, uint8_t *buffer);
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void aom_dk_stop_encode(aom_dk_writer *bc);
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static INLINE void aom_dk_write(aom_dk_writer *br, int bit, int probability) {
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unsigned int split;
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int count = br->count;
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unsigned int range = br->range;
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unsigned int lowvalue = br->lowvalue;
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register int shift;
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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(bit, probability);
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#endif // CONFIG_BITSTREAM_DEBUG
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split = 1 + (((range - 1) * probability) >> 8);
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range = split;
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if (bit) {
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lowvalue += split;
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range = br->range - split;
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}
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shift = aom_norm[range];
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range <<= shift;
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count += shift;
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if (count >= 0) {
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int offset = shift - count;
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if ((lowvalue << (offset - 1)) & 0x80000000) {
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int x = br->pos - 1;
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while (x >= 0 && br->buffer[x] == 0xff) {
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br->buffer[x] = 0;
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x--;
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}
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br->buffer[x] += 1;
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}
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br->buffer[br->pos++] = (lowvalue >> (24 - offset));
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lowvalue <<= offset;
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shift = count;
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lowvalue &= 0xffffff;
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count -= 8;
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}
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lowvalue <<= shift;
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br->count = count;
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br->lowvalue = lowvalue;
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br->range = range;
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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_DKBOOLWRITER_H_
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