1 /* 2 * Copyright (c) 2018, Alliance for Open Media. All rights reserved 3 * 4 * This source code is subject to the terms of the BSD 2 Clause License and 5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 6 * was not distributed with this source code in the LICENSE file, you can 7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open 8 * Media Patent License 1.0 was not distributed with this source code in the 9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent. 10 */ 11 12 /*!\file 13 * \brief A table mapping from time to corresponding film grain parameters. 14 * 15 * In order to apply grain synthesis in the decoder, the film grain parameters 16 * need to be signalled in the encoder. The film grain parameters are time 17 * varying, and for two-pass encoding (and denoiser implementation flexibility) 18 * it is common to denoise the video and do parameter estimation before encoding 19 * the denoised video. 20 * 21 * The film grain table is used to provide this flexibility and is used as a 22 * parameter that is passed to the encoder. 23 * 24 * Further, if regraining is to be done in say a single pass mode, or in two 25 * pass within the encoder (before frames are added to the lookahead buffer), 26 * this data structure can be used to keep track of on-the-fly estimated grain 27 * parameters, that are then extracted from the table before the encoded frame 28 * is written. 29 */ 30 #ifndef AOM_AOM_DSP_GRAIN_TABLE_H_ 31 #define AOM_AOM_DSP_GRAIN_TABLE_H_ 32 33 #ifdef __cplusplus 34 extern "C" { 35 #endif 36 37 #include "aom_dsp/grain_synthesis.h" 38 #include "aom/internal/aom_codec_internal.h" 39 40 typedef struct aom_film_grain_table_entry_t { 41 aom_film_grain_t params; 42 int64_t start_time; 43 int64_t end_time; 44 struct aom_film_grain_table_entry_t *next; 45 } aom_film_grain_table_entry_t; 46 47 typedef struct { 48 aom_film_grain_table_entry_t *head; 49 aom_film_grain_table_entry_t *tail; 50 } aom_film_grain_table_t; 51 52 /*!\brief Add a mapping from [time_stamp, end_time) to the given grain 53 * parameters 54 * 55 * \param[in/out] table The grain table 56 * \param[in] time_stamp The start time stamp 57 * \param[in] end_stamp The end time_stamp 58 * \param[in] grain The grain parameters 59 */ 60 void aom_film_grain_table_append(aom_film_grain_table_t *table, 61 int64_t time_stamp, int64_t end_time, 62 const aom_film_grain_t *grain); 63 64 /*!\brief Look-up (and optionally erase) the grain parameters for the given time 65 * 66 * \param[in] table The grain table 67 * \param[in] time_stamp The start time stamp 68 * \param[in] end_stamp The end time_stamp 69 * \param[in] erase Whether the time segment can be deleted 70 * \param[out] grain The output grain parameters 71 */ 72 int aom_film_grain_table_lookup(aom_film_grain_table_t *t, int64_t time_stamp, 73 int64_t end_time, int erase, 74 aom_film_grain_t *grain); 75 76 /*!\brief Reads the grain table from a file. 77 * 78 * \param[out] table The grain table 79 * \param[in] filename The file to read from 80 * \param[in] error_info Error info for tracking errors 81 */ 82 aom_codec_err_t aom_film_grain_table_read( 83 aom_film_grain_table_t *table, const char *filename, 84 struct aom_internal_error_info *error_info); 85 86 /*!\brief Writes the grain table from a file. 87 * 88 * \param[out] table The grain table 89 * \param[in] filename The file to read from 90 * \param[in] error_info Error info for tracking errors 91 */ 92 aom_codec_err_t aom_film_grain_table_write( 93 const aom_film_grain_table_t *t, const char *filename, 94 struct aom_internal_error_info *error_info); 95 96 void aom_film_grain_table_free(aom_film_grain_table_t *t); 97 98 #ifdef __cplusplus 99 } 100 #endif 101 102 #endif // AOM_AOM_DSP_GRAIN_TABLE_H_ 103
