233 lines
7.0 KiB
C
233 lines
7.0 KiB
C
/*
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* Copyright (c) 2016, Alliance for Open Media. All rights reserved.
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#ifndef AOM_AOM_DSP_BITREADER_H_
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#define AOM_AOM_DSP_BITREADER_H_
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#include <assert.h>
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#include <limits.h>
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#include "config/aom_config.h"
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#include "aom/aomdx.h"
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#include "aom/aom_integer.h"
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#include "aom_dsp/entdec.h"
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#include "aom_dsp/odintrin.h"
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#include "aom_dsp/prob.h"
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#if CONFIG_BITSTREAM_DEBUG
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#include "aom_util/debug_util.h"
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#endif // CONFIG_BITSTREAM_DEBUG
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#if CONFIG_ACCOUNTING
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#include "av1/decoder/accounting.h"
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#define ACCT_STR_NAME acct_str
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#define ACCT_STR_PARAM , const char *ACCT_STR_NAME
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#define ACCT_STR_ARG(s) , s
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#else
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#define ACCT_STR_PARAM
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#define ACCT_STR_ARG(s)
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#endif
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#define aom_read(r, prob, ACCT_STR_NAME) \
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aom_read_(r, prob ACCT_STR_ARG(ACCT_STR_NAME))
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#define aom_read_bit(r, ACCT_STR_NAME) \
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aom_read_bit_(r ACCT_STR_ARG(ACCT_STR_NAME))
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#define aom_read_tree(r, tree, probs, ACCT_STR_NAME) \
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aom_read_tree_(r, tree, probs ACCT_STR_ARG(ACCT_STR_NAME))
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#define aom_read_literal(r, bits, ACCT_STR_NAME) \
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aom_read_literal_(r, bits ACCT_STR_ARG(ACCT_STR_NAME))
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#define aom_read_cdf(r, cdf, nsymbs, ACCT_STR_NAME) \
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aom_read_cdf_(r, cdf, nsymbs ACCT_STR_ARG(ACCT_STR_NAME))
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#define aom_read_symbol(r, cdf, nsymbs, ACCT_STR_NAME) \
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aom_read_symbol_(r, cdf, nsymbs ACCT_STR_ARG(ACCT_STR_NAME))
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct aom_reader {
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const uint8_t *buffer;
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const uint8_t *buffer_end;
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od_ec_dec ec;
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#if CONFIG_ACCOUNTING
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Accounting *accounting;
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#endif
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uint8_t allow_update_cdf;
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};
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typedef struct aom_reader aom_reader;
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int aom_reader_init(aom_reader *r, const uint8_t *buffer, size_t size);
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const uint8_t *aom_reader_find_begin(aom_reader *r);
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const uint8_t *aom_reader_find_end(aom_reader *r);
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// Returns true if the bit reader has tried to decode more data from the buffer
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// than was actually provided.
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int aom_reader_has_overflowed(const aom_reader *r);
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// Returns the position in the bit reader in bits.
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uint32_t aom_reader_tell(const aom_reader *r);
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// Returns the position in the bit reader in 1/8th bits.
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uint32_t aom_reader_tell_frac(const aom_reader *r);
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#if CONFIG_ACCOUNTING
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static inline void aom_process_accounting(const aom_reader *r ACCT_STR_PARAM) {
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if (r->accounting != NULL) {
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uint32_t tell_frac;
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tell_frac = aom_reader_tell_frac(r);
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aom_accounting_record(r->accounting, ACCT_STR_NAME,
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tell_frac - r->accounting->last_tell_frac);
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r->accounting->last_tell_frac = tell_frac;
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}
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}
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static inline void aom_update_symb_counts(const aom_reader *r, int is_binary) {
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if (r->accounting != NULL) {
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r->accounting->syms.num_multi_syms += !is_binary;
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r->accounting->syms.num_binary_syms += !!is_binary;
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}
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}
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#endif
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static inline int aom_read_(aom_reader *r, int prob ACCT_STR_PARAM) {
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int p = (0x7FFFFF - (prob << 15) + prob) >> 8;
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int bit = od_ec_decode_bool_q15(&r->ec, p);
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#if CONFIG_BITSTREAM_DEBUG
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{
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int i;
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int ref_bit, ref_nsymbs;
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aom_cdf_prob ref_cdf[16];
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const int queue_r = bitstream_queue_get_read();
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const int frame_idx = aom_bitstream_queue_get_frame_read();
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bitstream_queue_pop(&ref_bit, ref_cdf, &ref_nsymbs);
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if (ref_nsymbs != 2) {
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fprintf(stderr,
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"\n *** [bit] nsymbs error, frame_idx_r %d nsymbs %d ref_nsymbs "
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"%d queue_r %d\n",
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frame_idx, 2, ref_nsymbs, queue_r);
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assert(0);
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}
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if ((ref_nsymbs != 2) || (ref_cdf[0] != (aom_cdf_prob)p) ||
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(ref_cdf[1] != 32767)) {
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fprintf(stderr,
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"\n *** [bit] cdf error, frame_idx_r %d cdf {%d, %d} ref_cdf {%d",
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frame_idx, p, 32767, ref_cdf[0]);
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for (i = 1; i < ref_nsymbs; ++i) fprintf(stderr, ", %d", ref_cdf[i]);
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fprintf(stderr, "} queue_r %d\n", queue_r);
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assert(0);
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}
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if (bit != ref_bit) {
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fprintf(stderr,
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"\n *** [bit] symb error, frame_idx_r %d symb %d ref_symb %d "
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"queue_r %d\n",
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frame_idx, bit, ref_bit, queue_r);
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assert(0);
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}
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}
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#endif
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#if CONFIG_ACCOUNTING
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if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME);
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aom_update_symb_counts(r, 1);
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#endif
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return bit;
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}
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static inline int aom_read_bit_(aom_reader *r ACCT_STR_PARAM) {
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int ret;
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ret = aom_read(r, 128, NULL); // aom_prob_half
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#if CONFIG_ACCOUNTING
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if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME);
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#endif
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return ret;
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}
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static inline int aom_read_literal_(aom_reader *r, int bits ACCT_STR_PARAM) {
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int literal = 0, bit;
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for (bit = bits - 1; bit >= 0; bit--) literal |= aom_read_bit(r, NULL) << bit;
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#if CONFIG_ACCOUNTING
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if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME);
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#endif
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return literal;
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}
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static inline int aom_read_cdf_(aom_reader *r, const aom_cdf_prob *cdf,
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int nsymbs ACCT_STR_PARAM) {
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int symb;
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assert(cdf != NULL);
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symb = od_ec_decode_cdf_q15(&r->ec, cdf, nsymbs);
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#if CONFIG_BITSTREAM_DEBUG
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{
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int i;
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int cdf_error = 0;
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int ref_symb, ref_nsymbs;
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aom_cdf_prob ref_cdf[16];
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const int queue_r = bitstream_queue_get_read();
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const int frame_idx = aom_bitstream_queue_get_frame_read();
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bitstream_queue_pop(&ref_symb, ref_cdf, &ref_nsymbs);
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if (nsymbs != ref_nsymbs) {
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fprintf(stderr,
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"\n *** nsymbs error, frame_idx_r %d nsymbs %d ref_nsymbs %d "
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"queue_r %d\n",
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frame_idx, nsymbs, ref_nsymbs, queue_r);
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cdf_error = 0;
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assert(0);
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} else {
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for (i = 0; i < nsymbs; ++i)
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if (cdf[i] != ref_cdf[i]) cdf_error = 1;
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}
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if (cdf_error) {
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fprintf(stderr, "\n *** cdf error, frame_idx_r %d cdf {%d", frame_idx,
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cdf[0]);
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for (i = 1; i < nsymbs; ++i) fprintf(stderr, ", %d", cdf[i]);
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fprintf(stderr, "} ref_cdf {%d", ref_cdf[0]);
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for (i = 1; i < ref_nsymbs; ++i) fprintf(stderr, ", %d", ref_cdf[i]);
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fprintf(stderr, "} queue_r %d\n", queue_r);
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assert(0);
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}
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if (symb != ref_symb) {
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fprintf(
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stderr,
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"\n *** symb error, frame_idx_r %d symb %d ref_symb %d queue_r %d\n",
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frame_idx, symb, ref_symb, queue_r);
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assert(0);
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}
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}
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#endif
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#if CONFIG_ACCOUNTING
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if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME);
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aom_update_symb_counts(r, (nsymbs == 2));
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#endif
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return symb;
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}
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static inline int aom_read_symbol_(aom_reader *r, aom_cdf_prob *cdf,
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int nsymbs ACCT_STR_PARAM) {
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int ret;
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ret = aom_read_cdf(r, cdf, nsymbs, ACCT_STR_NAME);
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if (r->allow_update_cdf) update_cdf(cdf, ret, nsymbs);
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return ret;
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}
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // AOM_AOM_DSP_BITREADER_H_
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