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260 lines
8.3 KiB
260 lines
8.3 KiB
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_FILM_GRAIN_PARAMS_H
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#define AVUTIL_FILM_GRAIN_PARAMS_H
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#include "frame.h"
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enum AVFilmGrainParamsType {
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AV_FILM_GRAIN_PARAMS_NONE = 0,
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/**
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* The union is valid when interpreted as AVFilmGrainAOMParams (codec.aom)
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*/
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AV_FILM_GRAIN_PARAMS_AV1,
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/**
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* The union is valid when interpreted as AVFilmGrainH274Params (codec.h274)
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*/
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AV_FILM_GRAIN_PARAMS_H274,
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};
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/**
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* This structure describes how to handle film grain synthesis for AOM codecs.
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*
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* @note The struct must be allocated as part of AVFilmGrainParams using
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* av_film_grain_params_alloc(). Its size is not a part of the public ABI.
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*/
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typedef struct AVFilmGrainAOMParams {
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/**
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* Number of points, and the scale and value for each point of the
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* piecewise linear scaling function for the uma plane.
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*/
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int num_y_points;
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uint8_t y_points[14][2 /* value, scaling */];
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/**
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* Signals whether to derive the chroma scaling function from the luma.
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* Not equivalent to copying the luma values and scales.
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*/
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int chroma_scaling_from_luma;
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/**
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* If chroma_scaling_from_luma is set to 0, signals the chroma scaling
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* function parameters.
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*/
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int num_uv_points[2 /* cb, cr */];
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uint8_t uv_points[2 /* cb, cr */][10][2 /* value, scaling */];
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/**
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* Specifies the shift applied to the chroma components. For AV1, its within
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* [8; 11] and determines the range and quantization of the film grain.
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*/
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int scaling_shift;
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/**
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* Specifies the auto-regression lag.
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*/
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int ar_coeff_lag;
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/**
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* Luma auto-regression coefficients. The number of coefficients is given by
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* 2 * ar_coeff_lag * (ar_coeff_lag + 1).
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*/
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int8_t ar_coeffs_y[24];
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/**
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* Chroma auto-regression coefficients. The number of coefficients is given by
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* 2 * ar_coeff_lag * (ar_coeff_lag + 1) + !!num_y_points.
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*/
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int8_t ar_coeffs_uv[2 /* cb, cr */][25];
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/**
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* Specifies the range of the auto-regressive coefficients. Values of 6,
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* 7, 8 and so on represent a range of [-2, 2), [-1, 1), [-0.5, 0.5) and
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* so on. For AV1 must be between 6 and 9.
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*/
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int ar_coeff_shift;
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/**
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* Signals the down shift applied to the generated gaussian numbers during
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* synthesis.
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*/
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int grain_scale_shift;
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/**
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* Specifies the luma/chroma multipliers for the index to the component
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* scaling function.
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*/
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int uv_mult[2 /* cb, cr */];
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int uv_mult_luma[2 /* cb, cr */];
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/**
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* Offset used for component scaling function. For AV1 its a 9-bit value
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* with a range [-256, 255]
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*/
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int uv_offset[2 /* cb, cr */];
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/**
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* Signals whether to overlap film grain blocks.
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*/
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int overlap_flag;
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/**
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* Signals to clip to limited color levels after film grain application.
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*/
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int limit_output_range;
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} AVFilmGrainAOMParams;
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/**
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* This structure describes how to handle film grain synthesis for codecs using
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* the ITU-T H.274 Versatile suplemental enhancement information message.
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*
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* @note The struct must be allocated as part of AVFilmGrainParams using
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* av_film_grain_params_alloc(). Its size is not a part of the public ABI.
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*/
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typedef struct AVFilmGrainH274Params {
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/**
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* Specifies the film grain simulation mode.
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* 0 = Frequency filtering, 1 = Auto-regression
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*/
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int model_id;
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/**
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* Specifies the bit depth used for the luma component.
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*/
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int bit_depth_luma;
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/**
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* Specifies the bit depth used for the chroma components.
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*/
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int bit_depth_chroma;
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enum AVColorRange color_range;
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enum AVColorPrimaries color_primaries;
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enum AVColorTransferCharacteristic color_trc;
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enum AVColorSpace color_space;
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/**
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* Specifies the blending mode used to blend the simulated film grain
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* with the decoded images.
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*
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* 0 = Additive, 1 = Multiplicative
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*/
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int blending_mode_id;
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/**
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* Specifies a scale factor used in the film grain characterization equations.
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*/
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int log2_scale_factor;
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/**
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* Indicates if the modelling of film grain for a given component is present.
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*/
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int component_model_present[3 /* y, cb, cr */];
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/**
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* Specifies the number of intensity intervals for which a specific set of
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* model values has been estimated, with a range of [1, 256].
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*/
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uint16_t num_intensity_intervals[3 /* y, cb, cr */];
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/**
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* Specifies the number of model values present for each intensity interval
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* in which the film grain has been modelled, with a range of [1, 6].
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*/
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uint8_t num_model_values[3 /* y, cb, cr */];
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/**
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* Specifies the lower ounds of each intensity interval for whichthe set of
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* model values applies for the component.
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*/
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uint8_t intensity_interval_lower_bound[3 /* y, cb, cr */][256 /* intensity interval */];
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/**
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* Specifies the upper bound of each intensity interval for which the set of
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* model values applies for the component.
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*/
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uint8_t intensity_interval_upper_bound[3 /* y, cb, cr */][256 /* intensity interval */];
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/**
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* Specifies the model values for the component for each intensity interval.
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* - When model_id == 0, the following applies:
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* For comp_model_value[y], the range of values is [0, 2^bit_depth_luma - 1]
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* For comp_model_value[cb..cr], the range of values is [0, 2^bit_depth_chroma - 1]
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* - Otherwise, the following applies:
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* For comp_model_value[y], the range of values is [-2^(bit_depth_luma - 1), 2^(bit_depth_luma - 1) - 1]
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* For comp_model_value[cb..cr], the range of values is [-2^(bit_depth_chroma - 1), 2^(bit_depth_chroma - 1) - 1]
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*/
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int16_t comp_model_value[3 /* y, cb, cr */][256 /* intensity interval */][6 /* model value */];
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} AVFilmGrainH274Params;
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/**
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* This structure describes how to handle film grain synthesis in video
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* for specific codecs. Must be present on every frame where film grain is
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* meant to be synthesised for correct presentation.
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*
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* @note The struct must be allocated with av_film_grain_params_alloc() and
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* its size is not a part of the public ABI.
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*/
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typedef struct AVFilmGrainParams {
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/**
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* Specifies the codec for which this structure is valid.
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*/
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enum AVFilmGrainParamsType type;
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/**
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* Seed to use for the synthesis process, if the codec allows for it.
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*
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* @note For H.264, this refers to `pic_offset` as defined in
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* SMPTE RDD 5-2006.
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*/
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uint64_t seed;
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/**
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* Additional fields may be added both here and in any structure included.
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* If a codec's film grain structure differs slightly over another
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* codec's, fields within may change meaning depending on the type.
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*/
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union {
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AVFilmGrainAOMParams aom;
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AVFilmGrainH274Params h274;
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} codec;
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} AVFilmGrainParams;
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/**
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* Allocate an AVFilmGrainParams structure and set its fields to
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* default values. The resulting struct can be freed using av_freep().
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* If size is not NULL it will be set to the number of bytes allocated.
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*
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* @return An AVFilmGrainParams filled with default values or NULL
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* on failure.
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*/
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AVFilmGrainParams *av_film_grain_params_alloc(size_t *size);
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/**
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* Allocate a complete AVFilmGrainParams and add it to the frame.
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*
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* @param frame The frame which side data is added to.
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*
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* @return The AVFilmGrainParams structure to be filled by caller.
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*/
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AVFilmGrainParams *av_film_grain_params_create_side_data(AVFrame *frame);
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#endif /* AVUTIL_FILM_GRAIN_PARAMS_H */
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