| /* |
| * Copyright (c) 2012 Andrew D'Addesio |
| * Copyright (c) 2013-2014 Mozilla Corporation |
| * Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef AVCODEC_OPUS_RC_H |
| #define AVCODEC_OPUS_RC_H |
| |
| #include <stdint.h> |
| #include "get_bits.h" |
| |
| #define OPUS_MAX_PACKET_SIZE 1275 |
| |
| #define opus_ilog(i) (av_log2(i) + !!(i)) |
| |
| typedef struct RawBitsContext { |
| const uint8_t *position; |
| uint32_t bytes; |
| uint32_t cachelen; |
| uint32_t cacheval; |
| } RawBitsContext; |
| |
| typedef struct OpusRangeCoder { |
| GetBitContext gb; |
| RawBitsContext rb; |
| uint32_t range; |
| uint32_t value; |
| uint32_t total_bits; |
| |
| /* Encoder */ |
| uint8_t buf[OPUS_MAX_PACKET_SIZE + 12]; /* memcpy vs (memmove + overreading) */ |
| uint8_t *rng_cur; /* Current range coded byte */ |
| int ext; /* Awaiting propagation */ |
| int rem; /* Carryout flag */ |
| |
| /* Encoding stats */ |
| int waste; |
| } OpusRangeCoder; |
| |
| /** |
| * CELT: estimate bits of entropy that have thus far been consumed for the |
| * current CELT frame, to integer and fractional (1/8th bit) precision |
| */ |
| static av_always_inline uint32_t opus_rc_tell(const OpusRangeCoder *rc) |
| { |
| return rc->total_bits - av_log2(rc->range) - 1; |
| } |
| |
| static av_always_inline uint32_t opus_rc_tell_frac(const OpusRangeCoder *rc) |
| { |
| uint32_t i, total_bits, rcbuffer, range; |
| |
| total_bits = rc->total_bits << 3; |
| rcbuffer = av_log2(rc->range) + 1; |
| range = rc->range >> (rcbuffer-16); |
| |
| for (i = 0; i < 3; i++) { |
| int bit; |
| range = range * range >> 15; |
| bit = range >> 16; |
| rcbuffer = rcbuffer << 1 | bit; |
| range >>= bit; |
| } |
| |
| return total_bits - rcbuffer; |
| } |
| |
| uint32_t ff_opus_rc_dec_cdf(OpusRangeCoder *rc, const uint16_t *cdf); |
| void ff_opus_rc_enc_cdf(OpusRangeCoder *rc, int val, const uint16_t *cdf); |
| |
| uint32_t ff_opus_rc_dec_log(OpusRangeCoder *rc, uint32_t bits); |
| void ff_opus_rc_enc_log(OpusRangeCoder *rc, int val, uint32_t bits); |
| |
| uint32_t ff_opus_rc_dec_uint_step(OpusRangeCoder *rc, int k0); |
| void ff_opus_rc_enc_uint_step(OpusRangeCoder *rc, uint32_t val, int k0); |
| |
| uint32_t ff_opus_rc_dec_uint_tri(OpusRangeCoder *rc, int qn); |
| void ff_opus_rc_enc_uint_tri(OpusRangeCoder *rc, uint32_t k, int qn); |
| |
| uint32_t ff_opus_rc_dec_uint(OpusRangeCoder *rc, uint32_t size); |
| void ff_opus_rc_enc_uint(OpusRangeCoder *rc, uint32_t val, uint32_t size); |
| |
| uint32_t ff_opus_rc_get_raw(OpusRangeCoder *rc, uint32_t count); |
| void ff_opus_rc_put_raw(OpusRangeCoder *rc, uint32_t val, uint32_t count); |
| |
| int ff_opus_rc_dec_laplace(OpusRangeCoder *rc, uint32_t symbol, int decay); |
| void ff_opus_rc_enc_laplace(OpusRangeCoder *rc, int *value, uint32_t symbol, int decay); |
| |
| int ff_opus_rc_dec_init(OpusRangeCoder *rc, const uint8_t *data, int size); |
| void ff_opus_rc_dec_raw_init(OpusRangeCoder *rc, const uint8_t *rightend, uint32_t bytes); |
| |
| void ff_opus_rc_enc_end(OpusRangeCoder *rc, uint8_t *dst, int size); |
| void ff_opus_rc_enc_init(OpusRangeCoder *rc); |
| |
| #define OPUS_RC_CHECKPOINT_UPDATE(rc) \ |
| rc_rollback_bits = opus_rc_tell_frac(rc); \ |
| rc_rollback_ctx = *rc |
| |
| #define OPUS_RC_CHECKPOINT_SPAWN(rc) \ |
| uint32_t rc_rollback_bits = opus_rc_tell_frac(rc); \ |
| OpusRangeCoder rc_rollback_ctx = *rc \ |
| |
| #define OPUS_RC_CHECKPOINT_BITS(rc) \ |
| (opus_rc_tell_frac(rc) - rc_rollback_bits) |
| |
| #define OPUS_RC_CHECKPOINT_ROLLBACK(rc) \ |
| memcpy(rc, &rc_rollback_ctx, sizeof(OpusRangeCoder)); \ |
| |
| #endif /* AVCODEC_OPUS_RC_H */ |