diff options
Diffstat (limited to 'third_party/aom/aom_dsp/bitreader.h')
-rw-r--r-- | third_party/aom/aom_dsp/bitreader.h | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/third_party/aom/aom_dsp/bitreader.h b/third_party/aom/aom_dsp/bitreader.h new file mode 100644 index 000000000..9cd34dd48 --- /dev/null +++ b/third_party/aom/aom_dsp/bitreader.h @@ -0,0 +1,276 @@ +/* + * 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 <assert.h> +#include <limits.h> + +#include "./aom_config.h" +#if CONFIG_EC_ADAPT && !CONFIG_EC_MULTISYMBOL +#error "CONFIG_EC_ADAPT is enabled without enabling CONFIG_EC_MULTISYMBOL." +#endif + +#include "aom/aomdx.h" +#include "aom/aom_integer.h" +#if CONFIG_ANS +#include "aom_dsp/ansreader.h" +#elif CONFIG_DAALA_EC +#include "aom_dsp/daalaboolreader.h" +#else +#include "aom_dsp/dkboolreader.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; +#elif CONFIG_DAALA_EC +typedef struct daala_reader aom_reader; +#else +typedef struct aom_dk_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) { +#if CONFIG_ANS + (void)decrypt_cb; + (void)decrypt_state; + if (size > INT_MAX) return 1; + return ans_read_init(r, buffer, (int)size); +#elif CONFIG_DAALA_EC + (void)decrypt_cb; + (void)decrypt_state; + return aom_daala_reader_init(r, buffer, (int)size); +#else + return aom_dk_reader_init(r, buffer, size, decrypt_cb, decrypt_state); +#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; +#elif CONFIG_DAALA_EC + return aom_daala_reader_find_end(r); +#else + return aom_dk_reader_find_end(r); +#endif +} + +static INLINE int aom_reader_has_error(aom_reader *r) { +#if CONFIG_ANS + return ans_reader_has_error(r); +#elif CONFIG_DAALA_EC + return aom_daala_reader_has_error(r); +#else + return aom_dk_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; +#elif CONFIG_DAALA_EC + return aom_daala_reader_tell(r); +#else + return aom_dk_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; +#elif CONFIG_DAALA_EC + return aom_daala_reader_tell_frac(r); +#else + return aom_dk_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); +#elif CONFIG_DAALA_EC + ret = aom_daala_read(r, prob); +#else + ret = aom_dk_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_DAALA_EC && 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_tree_as_bits(aom_reader *r, + const aom_tree_index *tree, + const aom_prob *probs) { + aom_tree_index i = 0; + + while ((i = tree[i + aom_read(r, probs[i >> 1], NULL)]) > 0) continue; + return -i; +} + +#if CONFIG_EC_MULTISYMBOL +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); +#elif CONFIG_DAALA_EC + ret = daala_read_symbol(r, cdf, nsymbs); +#else +#error \ + "CONFIG_EC_MULTISYMBOL is selected without a valid backing entropy " \ + "coder. Enable daala_ec or ans for a valid configuration." +#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); +#if CONFIG_EC_ADAPT + update_cdf(cdf, ret, nsymbs); +#endif + 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; +} +#endif // CONFIG_EC_MULTISYMBOL + +static INLINE int aom_read_tree_(aom_reader *r, const aom_tree_index *tree, + const aom_prob *probs ACCT_STR_PARAM) { + int ret; +#if CONFIG_EC_MULTISYMBOL + ret = aom_read_tree_as_cdf(r, tree, probs); +#else + ret = aom_read_tree_as_bits(r, tree, probs); +#endif +#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_ |