| /*Daala video codec |
| Copyright (c) 2001-2013 Daala project contributors. All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are met: |
| |
| - Redistributions of source code must retain the above copyright notice, this |
| list of conditions and the following disclaimer. |
| |
| - Redistributions in binary form must reproduce the above copyright notice, |
| this list of conditions and the following disclaimer in the documentation |
| and/or other materials provided with the distribution. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE |
| FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.*/ |
| |
| #if !defined(_entdec_H) |
| #define _entdec_H (1) |
| #include <limits.h> |
| #include "aom_dsp/entcode.h" |
| #if OD_ACCOUNTING |
| #include "./accounting.h" |
| #endif |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| typedef struct od_ec_dec od_ec_dec; |
| |
| #if OD_ACCOUNTING |
| #define OD_ACC_STR , char *acc_str |
| #define od_ec_decode_bool(dec, fz, ft, str) od_ec_decode_bool_(dec, fz, ft, str) |
| #define od_ec_decode_bool_q15(dec, fz, str) od_ec_decode_bool_q15_(dec, fz, str) |
| #define od_ec_decode_cdf(dec, cdf, nsyms, str) \ |
| od_ec_decode_cdf_(dec, cdf, nsyms, str) |
| #define od_ec_decode_cdf_q15(dec, cdf, nsyms, str) \ |
| od_ec_decode_cdf_q15_(dec, cdf, nsyms, str) |
| #define od_ec_decode_cdf_unscaled(dec, cdf, nsyms, str) \ |
| od_ec_decode_cdf_unscaled_(dec, cdf, nsyms, str) |
| #define od_ec_decode_cdf_unscaled_dyadic(dec, cdf, nsyms, ftb, str) \ |
| od_ec_decode_cdf_unscaled_dyadic_(dec, cdf, nsyms, ftb, str) |
| #define od_ec_dec_uint(dec, ft, str) od_ec_dec_uint_(dec, ft, str) |
| #define od_ec_dec_bits(dec, ftb, str) od_ec_dec_bits_(dec, ftb, str) |
| #else |
| #define OD_ACC_STR |
| #define od_ec_decode_bool(dec, fz, ft, str) od_ec_decode_bool_(dec, fz, ft) |
| #define od_ec_decode_bool_q15(dec, fz, str) od_ec_decode_bool_q15_(dec, fz) |
| #define od_ec_decode_cdf(dec, cdf, nsyms, str) \ |
| od_ec_decode_cdf_(dec, cdf, nsyms) |
| #define od_ec_decode_cdf_q15(dec, cdf, nsyms, str) \ |
| od_ec_decode_cdf_q15_(dec, cdf, nsyms) |
| #define od_ec_decode_cdf_unscaled(dec, cdf, nsyms, str) \ |
| od_ec_decode_cdf_unscaled_(dec, cdf, nsyms) |
| #define od_ec_decode_cdf_unscaled_dyadic(dec, cdf, nsyms, ftb, str) \ |
| od_ec_decode_cdf_unscaled_dyadic_(dec, cdf, nsyms, ftb) |
| #define od_ec_dec_uint(dec, ft, str) od_ec_dec_uint_(dec, ft) |
| #define od_ec_dec_bits(dec, ftb, str) od_ec_dec_bits_(dec, ftb) |
| #endif |
| |
| /*The entropy decoder context.*/ |
| struct od_ec_dec { |
| /*The start of the current input buffer.*/ |
| const unsigned char *buf; |
| /*The read pointer for the raw bits.*/ |
| const unsigned char *eptr; |
| /*Bits that will be read from/written at the end.*/ |
| od_ec_window end_window; |
| /*Number of valid bits in end_window.*/ |
| int nend_bits; |
| /*An offset used to keep track of tell after reaching the end of the stream. |
| This is constant throughout most of the decoding process, but becomes |
| important once we hit the end of the buffer and stop incrementing pointers |
| (and instead pretend cnt/nend_bits have lots of bits).*/ |
| int32_t tell_offs; |
| /*The end of the current input buffer.*/ |
| const unsigned char *end; |
| /*The read pointer for the entropy-coded bits.*/ |
| const unsigned char *bptr; |
| /*The difference between the coded value and the low end of the current |
| range.*/ |
| od_ec_window dif; |
| /*The number of values in the current range.*/ |
| uint16_t rng; |
| /*The number of bits of data in the current value.*/ |
| int16_t cnt; |
| /*Nonzero if an error occurred.*/ |
| int error; |
| #if OD_ACCOUNTING |
| od_accounting_internal *acct; |
| #endif |
| }; |
| |
| /*See entdec.c for further documentation.*/ |
| |
| void od_ec_dec_init(od_ec_dec *dec, const unsigned char *buf, uint32_t storage) |
| OD_ARG_NONNULL(1) OD_ARG_NONNULL(2); |
| |
| OD_WARN_UNUSED_RESULT int od_ec_decode_bool_(od_ec_dec *dec, unsigned fz, |
| unsigned ft OD_ACC_STR) |
| OD_ARG_NONNULL(1); |
| OD_WARN_UNUSED_RESULT int od_ec_decode_bool_q15_(od_ec_dec *dec, |
| unsigned fz OD_ACC_STR) |
| OD_ARG_NONNULL(1); |
| OD_WARN_UNUSED_RESULT int od_ec_decode_cdf_(od_ec_dec *dec, const uint16_t *cdf, |
| int nsyms OD_ACC_STR) |
| OD_ARG_NONNULL(1) OD_ARG_NONNULL(2); |
| OD_WARN_UNUSED_RESULT int od_ec_decode_cdf_q15_(od_ec_dec *dec, |
| const uint16_t *cdf, |
| int nsyms OD_ACC_STR) |
| OD_ARG_NONNULL(1) OD_ARG_NONNULL(2); |
| OD_WARN_UNUSED_RESULT int od_ec_decode_cdf_unscaled_(od_ec_dec *dec, |
| const uint16_t *cdf, |
| int nsyms OD_ACC_STR) |
| OD_ARG_NONNULL(1) OD_ARG_NONNULL(2); |
| OD_WARN_UNUSED_RESULT int od_ec_decode_cdf_unscaled_dyadic_( |
| od_ec_dec *dec, const uint16_t *cdf, int nsyms, unsigned _ftb OD_ACC_STR) |
| OD_ARG_NONNULL(1) OD_ARG_NONNULL(2); |
| |
| OD_WARN_UNUSED_RESULT uint32_t od_ec_dec_uint_(od_ec_dec *dec, |
| uint32_t ft OD_ACC_STR) |
| OD_ARG_NONNULL(1); |
| |
| OD_WARN_UNUSED_RESULT uint32_t od_ec_dec_bits_(od_ec_dec *dec, |
| unsigned ftb OD_ACC_STR) |
| OD_ARG_NONNULL(1); |
| |
| OD_WARN_UNUSED_RESULT int od_ec_dec_tell(od_ec_dec *dec) OD_ARG_NONNULL(1); |
| uint32_t od_ec_dec_tell_frac(od_ec_dec *dec) OD_ARG_NONNULL(1); |
| |
| #ifdef __cplusplus |
| } // extern "C" |
| #endif |
| |
| #endif |