--- /dev/null
+/**
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "film_grain_params.h"
+
+AVFilmGrainParams *av_film_grain_params_alloc(size_t *size)
+{
+ AVFilmGrainParams *params = av_mallocz(sizeof(AVFilmGrainParams));
+
+ if (size)
+ *size = sizeof(*params);
+
+ return params;
+}
+
+AVFilmGrainParams *av_film_grain_params_create_side_data(AVFrame *frame)
+{
+ AVFrameSideData *side_data = av_frame_new_side_data(frame,
+ AV_FRAME_DATA_FILM_GRAIN_PARAMS,
+ sizeof(AVFilmGrainParams));
+ if (!side_data)
+ return NULL;
+
+ memset(side_data->data, 0, sizeof(AVFilmGrainParams));
+
+ return (AVFilmGrainParams *)side_data->data;
+}
--- /dev/null
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVUTIL_FILM_GRAIN_PARAMS_H
+#define AVUTIL_FILM_GRAIN_PARAMS_H
+
+#include "frame.h"
+
+enum AVFilmGrainParamsType {
+ AV_FILM_GRAM_PARAMS_NONE = 0,
+
+ /**
+ * The union is valid when interpreted as AVFilmGrainAOMParams (codec.aom)
+ */
+ AV_FILM_GRAM_PARAMS_AV1,
+};
+
+/**
+ * This structure describes how to handle film grain synthesis for AOM codecs.
+ *
+ * @note The struct must be allocated as part of AVFilmGrainParams using
+ * av_film_grain_params_alloc(). Its size is not a part of the public ABI.
+ */
+typedef struct AVFilmGrainAOMParams {
+ /**
+ * Number of points, and the scale and value for each point of the
+ * piecewise linear scaling function for the uma plane.
+ */
+ int num_y_points;
+ uint8_t y_points[14][2 /* value, scaling */];
+
+ /**
+ * Signals whether to derive the chroma scaling function from the luma.
+ * Not equivalent to copying the luma values and scales.
+ */
+ int chroma_scaling_from_luma;
+
+ /**
+ * If chroma_scaling_from_luma is set to 0, signals the chroma scaling
+ * function parameters.
+ */
+ int num_uv_points[2];
+ uint8_t uv_points[2][10][2 /* value, scaling */];
+
+ /**
+ * Specifies the shift applied to the chroma components. For AV1, its within
+ * [8; 11] and determines the range and quantization of the film grain.
+ */
+ int scaling_shift;
+
+ /**
+ * Specifies the auto-regression lag. The number of coefficients is given by
+ * 2*ar_coeff_lag(ar_coeff_lag - 1), with an extra one for the chroma.
+ */
+ int ar_coeff_lag;
+
+ /**
+ * Luma auto-regression coefficients.
+ */
+ int8_t ar_coeffs_y[24];
+
+ /**
+ * Chroma auto-regression coefficients.
+ */
+ int8_t ar_coeffs_uv[2][25];
+
+ /**
+ * Specifies the range of the auto-regressive coefficients. Values of 6,
+ * 7, 8 and so on represent a range of [-2, 2), [-1, 1), [-0.5, 0.5) and
+ * so on. For AV1 must be between 6 and 9.
+ */
+ int ar_coeff_shift;
+
+ /**
+ * Signals the down shift applied to the generated gaussian numbers during
+ * synthesis.
+ */
+ int grain_scale_shift;
+
+ /**
+ * Specifies the luma/chroma multipliers for the index to the component
+ * scaling function.
+ */
+ int uv_mult[2];
+ int uv_mult_luma[2];
+
+ /**
+ * Offset used for component scaling function. For AV1 its a 9-bit value
+ * with a range [-256, 255]
+ */
+ int uv_offset[2];
+
+ /**
+ * Signals whether to overlap film grain blocks.
+ */
+ int overlap_flag;
+
+ /**
+ * Signals to clip to limited color levels after film grain application.
+ */
+ int limit_output_range;
+} AVFilmGrainAOMParams;
+
+/**
+ * This structure describes how to handle film grain synthesis in video
+ * for specific codecs. Must be present on every frame where film grain is
+ * meant to be synthesised for correct presentation.
+ *
+ * @note The struct must be allocated with av_film_grain_params_alloc() and
+ * its size is not a part of the public ABI.
+ */
+typedef struct AVFilmGrainParams {
+ /**
+ * Specifies the codec for which this structure is valid.
+ */
+ enum AVFilmGrainParamsType type;
+
+ /**
+ * Seed to use for the synthesis process, if the codec allows for it.
+ */
+ uint64_t seed;
+
+ /**
+ * Additional fields may be added both here and in any structure included.
+ * If a codec's film grain structure differs slightly over another
+ * codec's, fields within may change meaning depending on the type.
+ */
+ union {
+ AVFilmGrainAOMParams aom;
+ } codec;
+} AVFilmGrainParams;
+
+/**
+ * Allocate an AVFilmGrainParams structure and set its fields to
+ * default values. The resulting struct can be freed using av_freep().
+ * If size is not NULL it will be set to the number of bytes allocated.
+ *
+ * @return An AVFilmGrainParams filled with default values or NULL
+ * on failure.
+ */
+AVFilmGrainParams *av_film_grain_params_alloc(size_t *size);
+
+/**
+ * Allocate a complete AVFilmGrainParams and add it to the frame.
+ *
+ * @param frame The frame which side data is added to.
+ *
+ * @return The AVFilmGrainParams structure to be filled by caller.
+ */
+AVFilmGrainParams *av_film_grain_params_create_side_data(AVFrame *frame);
+
+#endif /* AVUTIL_FILM_GRAIN_PARAMS_H */
projects / ffmpeg / commitdiff