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Diffstat (limited to 'libavcodec/opus_rc.h')
| -rw-r--r-- | libavcodec/opus_rc.h | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/libavcodec/opus_rc.h b/libavcodec/opus_rc.h new file mode 100644 index 0000000000..627f83229e --- /dev/null +++ b/libavcodec/opus_rc.h @@ -0,0 +1,126 @@ +/* + * 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 */ |