diff options
author | Rostislav Pehlivanov <atomnuker@gmail.com> | 2016-11-08 01:33:11 +0300 |
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committer | Rostislav Pehlivanov <atomnuker@gmail.com> | 2016-11-08 17:18:59 +0300 |
commit | 317be31eaf4f07b3bbeb703e8ee73d04b08a587c (patch) | |
tree | 9a07a44dde6a86a34bb8d6f7675b8eeaabd15f56 /libavcodec/opus_rc.h | |
parent | 0660a09dd1d12e17216d44ec42584690d812b7f3 (diff) |
opus: move the entropy decoding functions to opus_rc.c
The intention is to have both encoding and decoding functions
in opus_rc.c.
Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
Diffstat (limited to 'libavcodec/opus_rc.h')
-rw-r--r-- | libavcodec/opus_rc.h | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/libavcodec/opus_rc.h b/libavcodec/opus_rc.h new file mode 100644 index 0000000000..68ebc05af6 --- /dev/null +++ b/libavcodec/opus_rc.h @@ -0,0 +1,85 @@ +/* + * Copyright (c) 2012 Andrew D'Addesio + * Copyright (c) 2013-2014 Mozilla Corporation + * Copyright (c) 2016 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_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_read_bits; +} 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_read_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_read_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); +uint32_t ff_opus_rc_dec_log(OpusRangeCoder *rc, uint32_t bits); +uint32_t ff_opus_rc_dec_uint(OpusRangeCoder *rc, uint32_t size); +uint32_t ff_opus_rc_dec_uint_step(OpusRangeCoder *rc, int k0); +uint32_t ff_opus_rc_dec_uint_tri(OpusRangeCoder *rc, int qn); +uint32_t ff_opus_rc_get_raw(OpusRangeCoder *rc, uint32_t count); +int ff_opus_rc_dec_laplace(OpusRangeCoder *rc, 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); + +#endif /* AVCODEC_OPUS_RC_H */ |