/* * Copyright (c) 2016, Alliance for Open Media. All rights reserved * * This source code is subject to the terms of the BSD 2 Clause License and * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License * was not distributed with this source code in the LICENSE file, you can * obtain it at www.aomedia.org/license/software. If the Alliance for Open * Media Patent License 1.0 was not distributed with this source code in the * PATENTS file, you can obtain it at www.aomedia.org/license/patent. */ #ifndef AOM_DSP_BITREADER_H_ #define AOM_DSP_BITREADER_H_ #include #include #include "./aom_config.h" #include "aom/aomdx.h" #include "aom/aom_integer.h" #if CONFIG_ANS #include "aom_dsp/ansreader.h" #else #include "aom_dsp/daalaboolreader.h" #endif #include "aom_dsp/prob.h" #include "av1/common/odintrin.h" #if CONFIG_ACCOUNTING #include "av1/decoder/accounting.h" #define ACCT_STR_NAME acct_str #define ACCT_STR_PARAM , const char *ACCT_STR_NAME #define ACCT_STR_ARG(s) , s #else #define ACCT_STR_PARAM #define ACCT_STR_ARG(s) #endif #define aom_read(r, prob, ACCT_STR_NAME) \ aom_read_(r, prob ACCT_STR_ARG(ACCT_STR_NAME)) #define aom_read_bit(r, ACCT_STR_NAME) \ aom_read_bit_(r ACCT_STR_ARG(ACCT_STR_NAME)) #define aom_read_tree(r, tree, probs, ACCT_STR_NAME) \ aom_read_tree_(r, tree, probs ACCT_STR_ARG(ACCT_STR_NAME)) #define aom_read_literal(r, bits, ACCT_STR_NAME) \ aom_read_literal_(r, bits ACCT_STR_ARG(ACCT_STR_NAME)) #define aom_read_cdf(r, cdf, nsymbs, ACCT_STR_NAME) \ aom_read_cdf_(r, cdf, nsymbs ACCT_STR_ARG(ACCT_STR_NAME)) #define aom_read_symbol(r, cdf, nsymbs, ACCT_STR_NAME) \ aom_read_symbol_(r, cdf, nsymbs ACCT_STR_ARG(ACCT_STR_NAME)) #ifdef __cplusplus extern "C" { #endif #if CONFIG_ANS typedef struct AnsDecoder aom_reader; #else typedef struct daala_reader aom_reader; #endif static INLINE int aom_reader_init(aom_reader *r, const uint8_t *buffer, size_t size, aom_decrypt_cb decrypt_cb, void *decrypt_state) { (void)decrypt_cb; (void)decrypt_state; #if CONFIG_ANS if (size > INT_MAX) return 1; return ans_read_init(r, buffer, (int)size); #else return aom_daala_reader_init(r, buffer, (int)size); #endif } static INLINE const uint8_t *aom_reader_find_end(aom_reader *r) { #if CONFIG_ANS (void)r; assert(0 && "Use the raw buffer size with ANS"); return NULL; #else return aom_daala_reader_find_end(r); #endif } static INLINE int aom_reader_has_error(aom_reader *r) { #if CONFIG_ANS return ans_reader_has_error(r); #else return aom_daala_reader_has_error(r); #endif } // Returns the position in the bit reader in bits. static INLINE uint32_t aom_reader_tell(const aom_reader *r) { #if CONFIG_ANS (void)r; assert(0 && "aom_reader_tell() is unimplemented for ANS"); return 0; #else return aom_daala_reader_tell(r); #endif } // Returns the position in the bit reader in 1/8th bits. static INLINE uint32_t aom_reader_tell_frac(const aom_reader *r) { #if CONFIG_ANS (void)r; assert(0 && "aom_reader_tell_frac() is unimplemented for ANS"); return 0; #else return aom_daala_reader_tell_frac(r); #endif } #if CONFIG_ACCOUNTING static INLINE void aom_process_accounting(const aom_reader *r ACCT_STR_PARAM) { if (r->accounting != NULL) { uint32_t tell_frac; tell_frac = aom_reader_tell_frac(r); aom_accounting_record(r->accounting, ACCT_STR_NAME, tell_frac - r->accounting->last_tell_frac); r->accounting->last_tell_frac = tell_frac; } } static INLINE void aom_update_symb_counts(const aom_reader *r, int is_binary) { if (r->accounting != NULL) { r->accounting->syms.num_multi_syms += !is_binary; r->accounting->syms.num_binary_syms += !!is_binary; } } #endif static INLINE int aom_read_(aom_reader *r, int prob ACCT_STR_PARAM) { int ret; #if CONFIG_ANS ret = rabs_read(r, prob); #else ret = aom_daala_read(r, prob); #endif #if CONFIG_ACCOUNTING if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME); aom_update_symb_counts(r, 1); #endif return ret; } static INLINE int aom_read_bit_(aom_reader *r ACCT_STR_PARAM) { int ret; #if CONFIG_ANS ret = rabs_read_bit(r); // Non trivial optimization at half probability #elif CONFIG_RAWBITS // Note this uses raw bits and is not the same as aom_daala_read(r, 128); // Calls to this function are omitted from raw symbol accounting. ret = aom_daala_read_bit(r); #else ret = aom_read(r, 128, NULL); // aom_prob_half #endif #if CONFIG_ACCOUNTING if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME); #endif return ret; } static INLINE int aom_read_literal_(aom_reader *r, int bits ACCT_STR_PARAM) { int literal = 0, bit; for (bit = bits - 1; bit >= 0; bit--) literal |= aom_read_bit(r, NULL) << bit; #if CONFIG_ACCOUNTING if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME); #endif return literal; } static INLINE int aom_read_cdf_(aom_reader *r, const aom_cdf_prob *cdf, int nsymbs ACCT_STR_PARAM) { int ret; #if CONFIG_ANS (void)nsymbs; ret = rans_read(r, cdf); #else ret = daala_read_symbol(r, cdf, nsymbs); #endif #if CONFIG_ACCOUNTING if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME); aom_update_symb_counts(r, (nsymbs == 2)); #endif return ret; } static INLINE int aom_read_symbol_(aom_reader *r, aom_cdf_prob *cdf, int nsymbs ACCT_STR_PARAM) { int ret; ret = aom_read_cdf(r, cdf, nsymbs, ACCT_STR_NAME); update_cdf(cdf, ret, nsymbs); return ret; } static INLINE int aom_read_tree_as_cdf(aom_reader *r, const aom_tree_index *tree, const aom_prob *probs) { aom_tree_index i = 0; do { aom_cdf_prob cdf[16]; aom_tree_index index[16]; int path[16]; int dist[16]; int nsymbs; int symb; nsymbs = tree_to_cdf(tree, probs, i, cdf, index, path, dist); symb = aom_read_cdf(r, cdf, nsymbs, NULL); OD_ASSERT(symb >= 0 && symb < nsymbs); i = index[symb]; } while (i > 0); return -i; } static INLINE int aom_read_tree_(aom_reader *r, const aom_tree_index *tree, const aom_prob *probs ACCT_STR_PARAM) { int ret; ret = aom_read_tree_as_cdf(r, tree, probs); #if CONFIG_ACCOUNTING if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME); #endif return ret; } #ifdef __cplusplus } // extern "C" #endif #endif // AOM_DSP_BITREADER_H_