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/*
* Copyright (c) 2018, 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.
*/
/*!\file
* \brief A table mapping from time to corresponding film grain parameters.
*
* In order to apply grain synthesis in the decoder, the film grain parameters
* need to be signalled in the encoder. The film grain parameters are time
* varying, and for two-pass encoding (and denoiser implementation flexibility)
* it is common to denoise the video and do parameter estimation before encoding
* the denoised video.
*
* The film grain table is used to provide this flexibility and is used as a
* parameter that is passed to the encoder.
*
* Further, if regraining is to be done in say a single pass mode, or in two
* pass within the encoder (before frames are added to the lookahead buffer),
* this data structure can be used to keep track of on-the-fly estimated grain
* parameters, that are then extracted from the table before the encoded frame
* is written.
*/
#ifndef AOM_AOM_DSP_GRAIN_TABLE_H_
#define AOM_AOM_DSP_GRAIN_TABLE_H_
#ifdef __cplusplus
extern "C" {
#endif
#include "aom_dsp/grain_synthesis.h"
#include "aom/internal/aom_codec_internal.h"
typedef struct aom_film_grain_table_entry_t {
aom_film_grain_t params;
int64_t start_time;
int64_t end_time;
struct aom_film_grain_table_entry_t *next;
} aom_film_grain_table_entry_t;
typedef struct {
aom_film_grain_table_entry_t *head;
aom_film_grain_table_entry_t *tail;
} aom_film_grain_table_t;
/*!\brief Add a mapping from [time_stamp, end_time) to the given grain
* parameters
*
* \param[in/out] table The grain table
* \param[in] time_stamp The start time stamp
* \param[in] end_stamp The end time_stamp
* \param[in] grain The grain parameters
*/
void aom_film_grain_table_append(aom_film_grain_table_t *table,
int64_t time_stamp, int64_t end_time,
const aom_film_grain_t *grain);
/*!\brief Look-up (and optionally erase) the grain parameters for the given time
*
* \param[in] table The grain table
* \param[in] time_stamp The start time stamp
* \param[in] end_stamp The end time_stamp
* \param[in] erase Whether the time segment can be deleted
* \param[out] grain The output grain parameters
*/
int aom_film_grain_table_lookup(aom_film_grain_table_t *t, int64_t time_stamp,
int64_t end_time, int erase,
aom_film_grain_t *grain);
/*!\brief Reads the grain table from a file.
*
* \param[out] table The grain table
* \param[in] filename The file to read from
* \param[in] error_info Error info for tracking errors
*/
aom_codec_err_t aom_film_grain_table_read(
aom_film_grain_table_t *table, const char *filename,
struct aom_internal_error_info *error_info);
/*!\brief Writes the grain table from a file.
*
* \param[out] table The grain table
* \param[in] filename The file to read from
* \param[in] error_info Error info for tracking errors
*/
aom_codec_err_t aom_film_grain_table_write(
const aom_film_grain_table_t *t, const char *filename,
struct aom_internal_error_info *error_info);
void aom_film_grain_table_free(aom_film_grain_table_t *t);
#ifdef __cplusplus
}
#endif
#endif // AOM_AOM_DSP_GRAIN_TABLE_H_
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