108 lines
3.5 KiB
C
108 lines
3.5 KiB
C
/*
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* Copyright (c) 2001-2016, 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_ENTENC_H_
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#define AOM_AOM_DSP_ENTENC_H_
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#include <stddef.h>
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#include "aom_dsp/entcode.h"
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#include "aom_util/endian_inl.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef uint64_t od_ec_enc_window;
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typedef struct od_ec_enc od_ec_enc;
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#define OD_MEASURE_EC_OVERHEAD (0)
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/*The entropy encoder context.*/
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struct od_ec_enc {
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/*Buffered output.
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This contains only the raw bits until the final call to od_ec_enc_done(),
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where all the arithmetic-coded data gets prepended to it.*/
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unsigned char *buf;
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/*The size of the buffer.*/
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uint32_t storage;
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/*The offset at which the next entropy-coded byte will be written.*/
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uint32_t offs;
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/*The low end of the current range.*/
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od_ec_enc_window low;
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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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#if OD_MEASURE_EC_OVERHEAD
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double entropy;
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int nb_symbols;
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#endif
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};
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/*See entenc.c for further documentation.*/
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void od_ec_enc_init(od_ec_enc *enc, uint32_t size) OD_ARG_NONNULL(1);
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void od_ec_enc_reset(od_ec_enc *enc) OD_ARG_NONNULL(1);
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void od_ec_enc_clear(od_ec_enc *enc) OD_ARG_NONNULL(1);
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void od_ec_encode_bool_q15(od_ec_enc *enc, int val, unsigned f_q15)
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OD_ARG_NONNULL(1);
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void od_ec_encode_cdf_q15(od_ec_enc *enc, int s, const uint16_t *cdf, int nsyms)
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OD_ARG_NONNULL(1) OD_ARG_NONNULL(3);
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void od_ec_enc_bits(od_ec_enc *enc, uint32_t fl, unsigned ftb)
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OD_ARG_NONNULL(1);
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void od_ec_enc_patch_initial_bits(od_ec_enc *enc, unsigned val, int nbits)
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OD_ARG_NONNULL(1);
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OD_WARN_UNUSED_RESULT unsigned char *od_ec_enc_done(od_ec_enc *enc,
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uint32_t *nbytes)
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OD_ARG_NONNULL(1) OD_ARG_NONNULL(2);
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OD_WARN_UNUSED_RESULT int od_ec_enc_tell(const od_ec_enc *enc)
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OD_ARG_NONNULL(1);
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OD_WARN_UNUSED_RESULT uint32_t od_ec_enc_tell_frac(const od_ec_enc *enc)
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OD_ARG_NONNULL(1);
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// buf is the frame bitbuffer, offs is where carry to be added
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static AOM_INLINE void propagate_carry_bwd(unsigned char *buf, uint32_t offs) {
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uint16_t sum, carry = 1;
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do {
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sum = (uint16_t)buf[offs] + 1;
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buf[offs--] = (unsigned char)sum;
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carry = sum >> 8;
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} while (carry);
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}
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// Convert to big-endian byte order and write data to buffer adding the
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// carry-bit
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static AOM_INLINE void write_enc_data_to_out_buf(unsigned char *out,
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uint32_t offs, uint64_t output,
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uint64_t carry,
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uint32_t *enc_offs,
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uint8_t num_bytes_ready) {
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const uint64_t reg = HToBE64(output << ((8 - num_bytes_ready) << 3));
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memcpy(&out[offs], ®, 8);
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// Propagate carry backwards if exists
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if (carry) {
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assert(offs > 0);
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propagate_carry_bwd(out, offs - 1);
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}
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*enc_offs = offs + num_bytes_ready;
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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_ENTENC_H_
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