107 lines
4.3 KiB
C
107 lines
4.3 KiB
C
/*Daala video codec
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Copyright (c) 2001-2013 Daala project contributors. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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- Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.*/
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#if !defined(_entdec_H)
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#define _entdec_H (1)
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#include <limits.h>
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#include "aom_dsp/entcode.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct od_ec_dec od_ec_dec;
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/*The entropy decoder context.*/
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struct od_ec_dec {
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/*The start of the current input buffer.*/
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const unsigned char *buf;
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/*The read pointer for the raw bits.*/
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const unsigned char *eptr;
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/*Bits that will be read from/written at the end.*/
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od_ec_window end_window;
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/*Number of valid bits in end_window.*/
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int nend_bits;
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/*An offset used to keep track of tell after reaching the end of the stream.
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This is constant throughout most of the decoding process, but becomes
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important once we hit the end of the buffer and stop incrementing pointers
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(and instead pretend cnt/nend_bits have lots of bits).*/
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int32_t tell_offs;
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/*The end of the current input buffer.*/
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const unsigned char *end;
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/*The read pointer for the entropy-coded bits.*/
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const unsigned char *bptr;
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/*The difference between the coded value and the low end of the current
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range.*/
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od_ec_window dif;
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/*The number of values in the current range.*/
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uint16_t rng;
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/*The number of bits of data in the current value.*/
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int16_t cnt;
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/*Nonzero if an error occurred.*/
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int error;
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};
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/*See entdec.c for further documentation.*/
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void od_ec_dec_init(od_ec_dec *dec, const unsigned char *buf, uint32_t storage)
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OD_ARG_NONNULL(1) OD_ARG_NONNULL(2);
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OD_WARN_UNUSED_RESULT int od_ec_decode_bool(od_ec_dec *dec, unsigned fz,
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unsigned ft) OD_ARG_NONNULL(1);
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OD_WARN_UNUSED_RESULT int od_ec_decode_bool_q15(od_ec_dec *dec, unsigned fz)
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OD_ARG_NONNULL(1);
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OD_WARN_UNUSED_RESULT int od_ec_decode_cdf(od_ec_dec *dec, const uint16_t *cdf,
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int nsyms) OD_ARG_NONNULL(1)
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OD_ARG_NONNULL(2);
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OD_WARN_UNUSED_RESULT int od_ec_decode_cdf_q15(od_ec_dec *dec,
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const uint16_t *cdf, int nsyms)
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OD_ARG_NONNULL(1) OD_ARG_NONNULL(2);
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OD_WARN_UNUSED_RESULT int od_ec_decode_cdf_unscaled(od_ec_dec *dec,
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const uint16_t *cdf,
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int nsyms) OD_ARG_NONNULL(1)
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OD_ARG_NONNULL(2);
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OD_WARN_UNUSED_RESULT int od_ec_decode_cdf_unscaled_dyadic(od_ec_dec *dec,
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const uint16_t *cdf,
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int nsyms,
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unsigned _ftb)
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OD_ARG_NONNULL(1) OD_ARG_NONNULL(2);
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OD_WARN_UNUSED_RESULT uint32_t od_ec_dec_uint(od_ec_dec *dec, uint32_t ft)
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OD_ARG_NONNULL(1);
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OD_WARN_UNUSED_RESULT uint32_t od_ec_dec_bits(od_ec_dec *dec, unsigned ftb)
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OD_ARG_NONNULL(1);
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OD_WARN_UNUSED_RESULT int od_ec_dec_tell(const od_ec_dec *dec)
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OD_ARG_NONNULL(1);
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OD_WARN_UNUSED_RESULT uint32_t od_ec_dec_tell_frac(const od_ec_dec *dec)
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OD_ARG_NONNULL(1);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif
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