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86 lines
2.7 KiB
86 lines
2.7 KiB
8 years ago
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/*
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* Copyright (c) 2012 Andrew D'Addesio
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* Copyright (c) 2013-2014 Mozilla Corporation
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* Copyright (c) 2016 Rostislav Pehlivanov <atomnuker@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_OPUS_RC_H
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#define AVCODEC_OPUS_RC_H
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#include <stdint.h>
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#include "get_bits.h"
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#define opus_ilog(i) (av_log2(i) + !!(i))
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typedef struct RawBitsContext {
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const uint8_t *position;
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uint32_t bytes;
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uint32_t cachelen;
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uint32_t cacheval;
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} RawBitsContext;
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typedef struct OpusRangeCoder {
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GetBitContext gb;
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RawBitsContext rb;
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uint32_t range;
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uint32_t value;
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uint32_t total_read_bits;
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} OpusRangeCoder;
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/**
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* CELT: estimate bits of entropy that have thus far been consumed for the
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* current CELT frame, to integer and fractional (1/8th bit) precision
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*/
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static av_always_inline uint32_t opus_rc_tell(const OpusRangeCoder *rc)
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{
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return rc->total_read_bits - av_log2(rc->range) - 1;
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}
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static av_always_inline uint32_t opus_rc_tell_frac(const OpusRangeCoder *rc)
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{
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uint32_t i, total_bits, rcbuffer, range;
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total_bits = rc->total_read_bits << 3;
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rcbuffer = av_log2(rc->range) + 1;
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range = rc->range >> (rcbuffer-16);
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for (i = 0; i < 3; i++) {
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int bit;
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range = range * range >> 15;
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bit = range >> 16;
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rcbuffer = rcbuffer << 1 | bit;
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range >>= bit;
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}
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return total_bits - rcbuffer;
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}
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uint32_t ff_opus_rc_dec_cdf(OpusRangeCoder *rc, const uint16_t *cdf);
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uint32_t ff_opus_rc_dec_log(OpusRangeCoder *rc, uint32_t bits);
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uint32_t ff_opus_rc_dec_uint(OpusRangeCoder *rc, uint32_t size);
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uint32_t ff_opus_rc_dec_uint_step(OpusRangeCoder *rc, int k0);
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uint32_t ff_opus_rc_dec_uint_tri(OpusRangeCoder *rc, int qn);
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uint32_t ff_opus_rc_get_raw(OpusRangeCoder *rc, uint32_t count);
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int ff_opus_rc_dec_laplace(OpusRangeCoder *rc, uint32_t symbol, int decay);
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int ff_opus_rc_dec_init(OpusRangeCoder *rc, const uint8_t *data, int size);
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void ff_opus_rc_dec_raw_init(OpusRangeCoder *rc, const uint8_t *rightend, uint32_t bytes);
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#endif /* AVCODEC_OPUS_RC_H */
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