[deb_ffmpeg.git] / ffmpeg / libavfilter / vf_lut.c

/*
 * Copyright (c) 2011 Stefano Sabatini
 *
 * 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
 */

/**
 * @file
 * Compute a look-up table for binding the input value to the output
 * value, and apply it to input video.
 */

#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "libavutil/eval.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "drawutils.h"
#include "formats.h"
#include "internal.h"
#include "video.h"

static const char *const var_names[] = {
    "w",        ///< width of the input video
    "h",        ///< height of the input video
    "val",      ///< input value for the pixel
    "maxval",   ///< max value for the pixel
    "minval",   ///< min value for the pixel
    "negval",   ///< negated value
    "clipval",
    NULL
};

enum var_name {
    VAR_W,
    VAR_H,
    VAR_VAL,
    VAR_MAXVAL,
    VAR_MINVAL,
    VAR_NEGVAL,
    VAR_CLIPVAL,
    VAR_VARS_NB
};

typedef struct LutContext {
    const AVClass *class;
    uint8_t lut[4][256];  ///< lookup table for each component
    char   *comp_expr_str[4];
    AVExpr *comp_expr[4];
    int hsub, vsub;
    double var_values[VAR_VARS_NB];
    int is_rgb, is_yuv;
    int step;
    int negate_alpha; /* only used by negate */
} LutContext;

#define Y 0
#define U 1
#define V 2
#define R 0
#define G 1
#define B 2
#define A 3

#define OFFSET(x) offsetof(LutContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

static const AVOption options[] = {
    { "c0", "set component #0 expression", OFFSET(comp_expr_str[0]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
    { "c1", "set component #1 expression", OFFSET(comp_expr_str[1]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
    { "c2", "set component #2 expression", OFFSET(comp_expr_str[2]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
    { "c3", "set component #3 expression", OFFSET(comp_expr_str[3]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
    { "y",  "set Y expression",            OFFSET(comp_expr_str[Y]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
    { "u",  "set U expression",            OFFSET(comp_expr_str[U]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
    { "v",  "set V expression",            OFFSET(comp_expr_str[V]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
    { "r",  "set R expression",            OFFSET(comp_expr_str[R]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
    { "g",  "set G expression",            OFFSET(comp_expr_str[G]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
    { "b",  "set B expression",            OFFSET(comp_expr_str[B]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
    { "a",  "set A expression",            OFFSET(comp_expr_str[A]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
    { NULL }
};

static av_cold void uninit(AVFilterContext *ctx)
{
    LutContext *s = ctx->priv;
    int i;

    for (i = 0; i < 4; i++) {
        av_expr_free(s->comp_expr[i]);
        s->comp_expr[i] = NULL;
        av_freep(&s->comp_expr_str[i]);
    }
}

#define YUV_FORMATS                                         \
    AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P,    \
    AV_PIX_FMT_YUV411P,  AV_PIX_FMT_YUV410P,  AV_PIX_FMT_YUV440P,    \
    AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,   \
    AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,   \
    AV_PIX_FMT_YUVJ440P

#define RGB_FORMATS                             \
    AV_PIX_FMT_ARGB,         AV_PIX_FMT_RGBA,         \
    AV_PIX_FMT_ABGR,         AV_PIX_FMT_BGRA,         \
    AV_PIX_FMT_RGB24,        AV_PIX_FMT_BGR24

static const enum AVPixelFormat yuv_pix_fmts[] = { YUV_FORMATS, AV_PIX_FMT_NONE };
static const enum AVPixelFormat rgb_pix_fmts[] = { RGB_FORMATS, AV_PIX_FMT_NONE };
static const enum AVPixelFormat all_pix_fmts[] = { RGB_FORMATS, YUV_FORMATS, AV_PIX_FMT_NONE };

static int query_formats(AVFilterContext *ctx)
{
    LutContext *s = ctx->priv;

    const enum AVPixelFormat *pix_fmts = s->is_rgb ? rgb_pix_fmts :
                                                     s->is_yuv ? yuv_pix_fmts :
                                                                 all_pix_fmts;

    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
    return 0;
}

/**
 * Clip value val in the minval - maxval range.
 */
static double clip(void *opaque, double val)
{
    LutContext *s = opaque;
    double minval = s->var_values[VAR_MINVAL];
    double maxval = s->var_values[VAR_MAXVAL];

    return av_clip(val, minval, maxval);
}

/**
 * Compute gamma correction for value val, assuming the minval-maxval
 * range, val is clipped to a value contained in the same interval.
 */
static double compute_gammaval(void *opaque, double gamma)
{
    LutContext *s = opaque;
    double val    = s->var_values[VAR_CLIPVAL];
    double minval = s->var_values[VAR_MINVAL];
    double maxval = s->var_values[VAR_MAXVAL];

    return pow((val-minval)/(maxval-minval), gamma) * (maxval-minval)+minval;
}

/**
 * Compute Rec.709 gama correction of value val
 */
static double compute_gammaval709(void *opaque, double gamma)
{
    LutContext *s = opaque;
    double val    = s->var_values[VAR_CLIPVAL];
    double minval = s->var_values[VAR_MINVAL];
    double maxval = s->var_values[VAR_MAXVAL];
    double level = (val - minval) / (maxval - minval);
    level = level < 0.018 ? 4.5 * level
                          : 1.099 * pow(level, 1.0 / gamma) - 0.099;
    return level * (maxval - minval) + minval;
}

static double (* const funcs1[])(void *, double) = {
    (void *)clip,
    (void *)compute_gammaval,
    (void *)compute_gammaval709,
    NULL
};

static const char * const funcs1_names[] = {
    "clip",
    "gammaval",
    "gammaval709",
    NULL
};

static int config_props(AVFilterLink *inlink)
{
    AVFilterContext *ctx = inlink->dst;
    LutContext *s = ctx->priv;
    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
    uint8_t rgba_map[4]; /* component index -> RGBA color index map */
    int min[4], max[4];
    int val, color, ret;

    s->hsub = desc->log2_chroma_w;
    s->vsub = desc->log2_chroma_h;

    s->var_values[VAR_W] = inlink->w;
    s->var_values[VAR_H] = inlink->h;

    switch (inlink->format) {
    case AV_PIX_FMT_YUV410P:
    case AV_PIX_FMT_YUV411P:
    case AV_PIX_FMT_YUV420P:
    case AV_PIX_FMT_YUV422P:
    case AV_PIX_FMT_YUV440P:
    case AV_PIX_FMT_YUV444P:
    case AV_PIX_FMT_YUVA420P:
    case AV_PIX_FMT_YUVA422P:
    case AV_PIX_FMT_YUVA444P:
        min[Y] = min[U] = min[V] = 16;
        max[Y] = 235;
        max[U] = max[V] = 240;
        min[A] = 0; max[A] = 255;
        break;
    default:
        min[0] = min[1] = min[2] = min[3] = 0;
        max[0] = max[1] = max[2] = max[3] = 255;
    }

    s->is_yuv = s->is_rgb = 0;
    if      (ff_fmt_is_in(inlink->format, yuv_pix_fmts)) s->is_yuv = 1;
    else if (ff_fmt_is_in(inlink->format, rgb_pix_fmts)) s->is_rgb = 1;

    if (s->is_rgb) {
        ff_fill_rgba_map(rgba_map, inlink->format);
        s->step = av_get_bits_per_pixel(desc) >> 3;
    }

    for (color = 0; color < desc->nb_components; color++) {
        double res;
        int comp = s->is_rgb ? rgba_map[color] : color;

        /* create the parsed expression */
        av_expr_free(s->comp_expr[color]);
        s->comp_expr[color] = NULL;
        ret = av_expr_parse(&s->comp_expr[color], s->comp_expr_str[color],
                            var_names, funcs1_names, funcs1, NULL, NULL, 0, ctx);
        if (ret < 0) {
            av_log(ctx, AV_LOG_ERROR,
                   "Error when parsing the expression '%s' for the component %d and color %d.\n",
                   s->comp_expr_str[comp], comp, color);
            return AVERROR(EINVAL);
        }

        /* compute the lut */
        s->var_values[VAR_MAXVAL] = max[color];
        s->var_values[VAR_MINVAL] = min[color];

        for (val = 0; val < 256; val++) {
            s->var_values[VAR_VAL] = val;
            s->var_values[VAR_CLIPVAL] = av_clip(val, min[color], max[color]);
            s->var_values[VAR_NEGVAL] =
                av_clip(min[color] + max[color] - s->var_values[VAR_VAL],
                        min[color], max[color]);

            res = av_expr_eval(s->comp_expr[color], s->var_values, s);
            if (isnan(res)) {
                av_log(ctx, AV_LOG_ERROR,
                       "Error when evaluating the expression '%s' for the value %d for the component %d.\n",
                       s->comp_expr_str[color], val, comp);
                return AVERROR(EINVAL);
            }
            s->lut[comp][val] = av_clip((int)res, min[color], max[color]);
            av_log(ctx, AV_LOG_DEBUG, "val[%d][%d] = %d\n", comp, val, s->lut[comp][val]);
        }
    }

    return 0;
}

static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
    AVFilterContext *ctx = inlink->dst;
    LutContext *s = ctx->priv;
    AVFilterLink *outlink = ctx->outputs[0];
    AVFrame *out;
    uint8_t *inrow, *outrow, *inrow0, *outrow0;
    int i, j, plane, direct = 0;

    if (av_frame_is_writable(in)) {
        direct = 1;
        out = in;
    } else {
        out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
        if (!out) {
            av_frame_free(&in);
            return AVERROR(ENOMEM);
        }
        av_frame_copy_props(out, in);
    }

    if (s->is_rgb) {
        /* packed */
        inrow0  = in ->data[0];
        outrow0 = out->data[0];

        for (i = 0; i < in->height; i ++) {
            int w = inlink->w;
            const uint8_t (*tab)[256] = (const uint8_t (*)[256])s->lut;
            inrow  = inrow0;
            outrow = outrow0;
            for (j = 0; j < w; j++) {
                switch (s->step) {
                case 4:  outrow[3] = tab[3][inrow[3]]; // Fall-through
                case 3:  outrow[2] = tab[2][inrow[2]]; // Fall-through
                case 2:  outrow[1] = tab[1][inrow[1]]; // Fall-through
                default: outrow[0] = tab[0][inrow[0]];
                }
                outrow += s->step;
                inrow  += s->step;
            }
            inrow0  += in ->linesize[0];
            outrow0 += out->linesize[0];
        }
    } else {
        /* planar */
        for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
            int vsub = plane == 1 || plane == 2 ? s->vsub : 0;
            int hsub = plane == 1 || plane == 2 ? s->hsub : 0;
            int h = FF_CEIL_RSHIFT(inlink->h, vsub);
            int w = FF_CEIL_RSHIFT(inlink->w, hsub);

            inrow  = in ->data[plane];
            outrow = out->data[plane];

            for (i = 0; i < h; i++) {
                const uint8_t *tab = s->lut[plane];
                for (j = 0; j < w; j++)
                    outrow[j] = tab[inrow[j]];
                inrow  += in ->linesize[plane];
                outrow += out->linesize[plane];
            }
        }
    }

    if (!direct)
        av_frame_free(&in);

    return ff_filter_frame(outlink, out);
}

static const AVFilterPad inputs[] = {
    { .name         = "default",
      .type         = AVMEDIA_TYPE_VIDEO,
      .filter_frame = filter_frame,
      .config_props = config_props,
    },
    { NULL }
};
static const AVFilterPad outputs[] = {
    { .name = "default",
      .type = AVMEDIA_TYPE_VIDEO,
    },
    { NULL }
};

#define DEFINE_LUT_FILTER(name_, description_)                          \
    AVFilter ff_vf_##name_ = {                                          \
        .name          = #name_,                                        \
        .description   = NULL_IF_CONFIG_SMALL(description_),            \
        .priv_size     = sizeof(LutContext),                            \
        .priv_class    = &name_ ## _class,                              \
        .init          = name_##_init,                                  \
        .uninit        = uninit,                                        \
        .query_formats = query_formats,                                 \
        .inputs        = inputs,                                        \
        .outputs       = outputs,                                       \
        .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,        \
    }

#if CONFIG_LUT_FILTER

#define lut_options options
AVFILTER_DEFINE_CLASS(lut);

static int lut_init(AVFilterContext *ctx)
{
    return 0;
}

DEFINE_LUT_FILTER(lut, "Compute and apply a lookup table to the RGB/YUV input video.");
#endif

#if CONFIG_LUTYUV_FILTER

#define lutyuv_options options
AVFILTER_DEFINE_CLASS(lutyuv);

static av_cold int lutyuv_init(AVFilterContext *ctx)
{
    LutContext *s = ctx->priv;

    s->is_yuv = 1;

    return 0;
}

DEFINE_LUT_FILTER(lutyuv, "Compute and apply a lookup table to the YUV input video.");
#endif

#if CONFIG_LUTRGB_FILTER

#define lutrgb_options options
AVFILTER_DEFINE_CLASS(lutrgb);

static av_cold int lutrgb_init(AVFilterContext *ctx)
{
    LutContext *s = ctx->priv;

    s->is_rgb = 1;

    return 0;
}

DEFINE_LUT_FILTER(lutrgb, "Compute and apply a lookup table to the RGB input video.");
#endif

#if CONFIG_NEGATE_FILTER

static const AVOption negate_options[] = {
    { "negate_alpha", NULL, OFFSET(negate_alpha), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
    { NULL }
};

AVFILTER_DEFINE_CLASS(negate);

static av_cold int negate_init(AVFilterContext *ctx)
{
    LutContext *s = ctx->priv;
    int i;

    av_log(ctx, AV_LOG_DEBUG, "negate_alpha:%d\n", s->negate_alpha);

    for (i = 0; i < 4; i++) {
        s->comp_expr_str[i] = av_strdup((i == 3 && !s->negate_alpha) ?
                                          "val" : "negval");
        if (!s->comp_expr_str[i]) {
            uninit(ctx);
            return AVERROR(ENOMEM);
        }
    }

    return 0;
}

DEFINE_LUT_FILTER(negate, "Negate input video.");

#endif
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Copyright (c) 2011 Stefano Sabatini
	3	*
	4	* This file is part of FFmpeg.
	5	*
	6	* FFmpeg is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Lesser General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2.1 of the License, or (at your option) any later version.
	10	*
	11	* FFmpeg is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Lesser General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Lesser General Public
	17	* License along with FFmpeg; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	/**
	22	* @file
	23	* Compute a look-up table for binding the input value to the output
	24	* value, and apply it to input video.
	25	*/
	26
	27	#include "libavutil/attributes.h"
	28	#include "libavutil/common.h"
	29	#include "libavutil/eval.h"
	30	#include "libavutil/opt.h"
	31	#include "libavutil/pixdesc.h"
	32	#include "avfilter.h"
	33	#include "drawutils.h"
	34	#include "formats.h"
	35	#include "internal.h"
	36	#include "video.h"
	37
	38	static const char *const var_names[] = {
	39	"w", ///< width of the input video
	40	"h", ///< height of the input video
	41	"val", ///< input value for the pixel
	42	"maxval", ///< max value for the pixel
	43	"minval", ///< min value for the pixel
	44	"negval", ///< negated value
	45	"clipval",
	46	NULL
	47	};
	48
	49	enum var_name {
	50	VAR_W,
	51	VAR_H,
	52	VAR_VAL,
	53	VAR_MAXVAL,
	54	VAR_MINVAL,
	55	VAR_NEGVAL,
	56	VAR_CLIPVAL,
	57	VAR_VARS_NB
	58	};
	59
	60	typedef struct LutContext {
	61	const AVClass *class;
	62	uint8_t lut[4][256]; ///< lookup table for each component
	63	char *comp_expr_str[4];
	64	AVExpr *comp_expr[4];
65	int hsub, vsub;
66	double var_values[VAR_VARS_NB];
67	int is_rgb, is_yuv;
68	int step;
69	int negate_alpha; /* only used by negate */
70	} LutContext;
71
72	#define Y 0
73	#define U 1
74	#define V 2
75	#define R 0
76	#define G 1
77	#define B 2
78	#define A 3
79
80	#define OFFSET(x) offsetof(LutContext, x)
81	#define FLAGS AV_OPT_FLAG_FILTERING_PARAM\|AV_OPT_FLAG_VIDEO_PARAM
82
83	static const AVOption options[] = {
84	{ "c0", "set component #0 expression", OFFSET(comp_expr_str[0]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
85	{ "c1", "set component #1 expression", OFFSET(comp_expr_str[1]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
86	{ "c2", "set component #2 expression", OFFSET(comp_expr_str[2]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
87	{ "c3", "set component #3 expression", OFFSET(comp_expr_str[3]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
88	{ "y", "set Y expression", OFFSET(comp_expr_str[Y]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
89	{ "u", "set U expression", OFFSET(comp_expr_str[U]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
90	{ "v", "set V expression", OFFSET(comp_expr_str[V]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
91	{ "r", "set R expression", OFFSET(comp_expr_str[R]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
92	{ "g", "set G expression", OFFSET(comp_expr_str[G]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
93	{ "b", "set B expression", OFFSET(comp_expr_str[B]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
94	{ "a", "set A expression", OFFSET(comp_expr_str[A]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
95	{ NULL }
96	};
97
98	static av_cold void uninit(AVFilterContext *ctx)
99	{
100	LutContext *s = ctx->priv;
101	int i;
102
103	for (i = 0; i < 4; i++) {
104	av_expr_free(s->comp_expr[i]);
105	s->comp_expr[i] = NULL;
106	av_freep(&s->comp_expr_str[i]);
107	}
108	}
109
110	#define YUV_FORMATS \
111	AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, \
112	AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, \
113	AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P, \
114	AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P, \
115	AV_PIX_FMT_YUVJ440P
116
117	#define RGB_FORMATS \
118	AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA, \
119	AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA, \
120	AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24
121
122	static const enum AVPixelFormat yuv_pix_fmts[] = { YUV_FORMATS, AV_PIX_FMT_NONE };
123	static const enum AVPixelFormat rgb_pix_fmts[] = { RGB_FORMATS, AV_PIX_FMT_NONE };
124	static const enum AVPixelFormat all_pix_fmts[] = { RGB_FORMATS, YUV_FORMATS, AV_PIX_FMT_NONE };
125
126	static int query_formats(AVFilterContext *ctx)
127	{
128	LutContext *s = ctx->priv;
129
130	const enum AVPixelFormat *pix_fmts = s->is_rgb ? rgb_pix_fmts :
131	s->is_yuv ? yuv_pix_fmts :
132	all_pix_fmts;
133
134	ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
135	return 0;
136	}
137
138	/**
139	* Clip value val in the minval - maxval range.
140	*/
141	static double clip(void *opaque, double val)
142	{
143	LutContext *s = opaque;
144	double minval = s->var_values[VAR_MINVAL];
145	double maxval = s->var_values[VAR_MAXVAL];
146
147	return av_clip(val, minval, maxval);
148	}
149
150	/**
151	* Compute gamma correction for value val, assuming the minval-maxval
152	* range, val is clipped to a value contained in the same interval.
153	*/
154	static double compute_gammaval(void *opaque, double gamma)
155	{
156	LutContext *s = opaque;
157	double val = s->var_values[VAR_CLIPVAL];
158	double minval = s->var_values[VAR_MINVAL];
159	double maxval = s->var_values[VAR_MAXVAL];
160
161	return pow((val-minval)/(maxval-minval), gamma) * (maxval-minval)+minval;
162	}
163
f6fa7814 DM	164	/**
	165	* Compute Rec.709 gama correction of value val
	166	*/
	167	static double compute_gammaval709(void *opaque, double gamma)
	168	{
	169	LutContext *s = opaque;
	170	double val = s->var_values[VAR_CLIPVAL];
	171	double minval = s->var_values[VAR_MINVAL];
	172	double maxval = s->var_values[VAR_MAXVAL];
	173	double level = (val - minval) / (maxval - minval);
	174	level = level < 0.018 ? 4.5 * level
	175	: 1.099 * pow(level, 1.0 / gamma) - 0.099;
	176	return level * (maxval - minval) + minval;
	177	}
	178
2ba45a60 DM	179	static double (* const funcs1[])(void *, double) = {
	180	(void *)clip,
	181	(void *)compute_gammaval,
f6fa7814	182	(void *)compute_gammaval709,
2ba45a60 DM	183	NULL
	184	};
	185
	186	static const char * const funcs1_names[] = {
	187	"clip",
	188	"gammaval",
f6fa7814	189	"gammaval709",
2ba45a60 DM	190	NULL
	191	};
	192
	193	static int config_props(AVFilterLink *inlink)
	194	{
	195	AVFilterContext *ctx = inlink->dst;
	196	LutContext *s = ctx->priv;
	197	const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
	198	uint8_t rgba_map[4]; /* component index -> RGBA color index map */
	199	int min[4], max[4];
	200	int val, color, ret;
	201
	202	s->hsub = desc->log2_chroma_w;
	203	s->vsub = desc->log2_chroma_h;
	204
	205	s->var_values[VAR_W] = inlink->w;
	206	s->var_values[VAR_H] = inlink->h;
	207
	208	switch (inlink->format) {
	209	case AV_PIX_FMT_YUV410P:
	210	case AV_PIX_FMT_YUV411P:
	211	case AV_PIX_FMT_YUV420P:
	212	case AV_PIX_FMT_YUV422P:
	213	case AV_PIX_FMT_YUV440P:
	214	case AV_PIX_FMT_YUV444P:
	215	case AV_PIX_FMT_YUVA420P:
	216	case AV_PIX_FMT_YUVA422P:
	217	case AV_PIX_FMT_YUVA444P:
	218	min[Y] = min[U] = min[V] = 16;
	219	max[Y] = 235;
	220	max[U] = max[V] = 240;
	221	min[A] = 0; max[A] = 255;
	222	break;
	223	default:
	224	min[0] = min[1] = min[2] = min[3] = 0;
	225	max[0] = max[1] = max[2] = max[3] = 255;
	226	}
	227
	228	s->is_yuv = s->is_rgb = 0;
	229	if (ff_fmt_is_in(inlink->format, yuv_pix_fmts)) s->is_yuv = 1;
	230	else if (ff_fmt_is_in(inlink->format, rgb_pix_fmts)) s->is_rgb = 1;
	231
	232	if (s->is_rgb) {
	233	ff_fill_rgba_map(rgba_map, inlink->format);
	234	s->step = av_get_bits_per_pixel(desc) >> 3;
	235	}
	236
	237	for (color = 0; color < desc->nb_components; color++) {
	238	double res;
	239	int comp = s->is_rgb ? rgba_map[color] : color;
	240
	241	/* create the parsed expression */
	242	av_expr_free(s->comp_expr[color]);
	243	s->comp_expr[color] = NULL;
	244	ret = av_expr_parse(&s->comp_expr[color], s->comp_expr_str[color],
	245	var_names, funcs1_names, funcs1, NULL, NULL, 0, ctx);
	246	if (ret < 0) {
	247	av_log(ctx, AV_LOG_ERROR,
	248	"Error when parsing the expression '%s' for the component %d and color %d.\n",
	249	s->comp_expr_str[comp], comp, color);
	250	return AVERROR(EINVAL);
	251	}
	252
	253	/* compute the lut */
254	s->var_values[VAR_MAXVAL] = max[color];
255	s->var_values[VAR_MINVAL] = min[color];
256
257	for (val = 0; val < 256; val++) {
258	s->var_values[VAR_VAL] = val;
259	s->var_values[VAR_CLIPVAL] = av_clip(val, min[color], max[color]);
260	s->var_values[VAR_NEGVAL] =
261	av_clip(min[color] + max[color] - s->var_values[VAR_VAL],
262	min[color], max[color]);
263
264	res = av_expr_eval(s->comp_expr[color], s->var_values, s);
265	if (isnan(res)) {
266	av_log(ctx, AV_LOG_ERROR,
267	"Error when evaluating the expression '%s' for the value %d for the component %d.\n",
268	s->comp_expr_str[color], val, comp);
269	return AVERROR(EINVAL);
270	}
271	s->lut[comp][val] = av_clip((int)res, min[color], max[color]);
272	av_log(ctx, AV_LOG_DEBUG, "val[%d][%d] = %d\n", comp, val, s->lut[comp][val]);
273	}
274	}
275
276	return 0;
277	}
278
279	static int filter_frame(AVFilterLink inlink, AVFrame in)
280	{
281	AVFilterContext *ctx = inlink->dst;
282	LutContext *s = ctx->priv;
283	AVFilterLink *outlink = ctx->outputs[0];
284	AVFrame *out;
285	uint8_t inrow, outrow, inrow0, outrow0;
286	int i, j, plane, direct = 0;
287
288	if (av_frame_is_writable(in)) {
289	direct = 1;
290	out = in;
291	} else {
292	out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
293	if (!out) {
294	av_frame_free(&in);
295	return AVERROR(ENOMEM);
296	}
297	av_frame_copy_props(out, in);
298	}
299
300	if (s->is_rgb) {
301	/* packed */
302	inrow0 = in ->data[0];
303	outrow0 = out->data[0];
304
305	for (i = 0; i < in->height; i ++) {
306	int w = inlink->w;
307	const uint8_t (tab)[256] = (const uint8_t ()[256])s->lut;
308	inrow = inrow0;
309	outrow = outrow0;
310	for (j = 0; j < w; j++) {
311	switch (s->step) {
312	case 4: outrow[3] = tab[3][inrow[3]]; // Fall-through
313	case 3: outrow[2] = tab[2][inrow[2]]; // Fall-through
314	case 2: outrow[1] = tab[1][inrow[1]]; // Fall-through
315	default: outrow[0] = tab[0][inrow[0]];
316	}
317	outrow += s->step;
318	inrow += s->step;
319	}
320	inrow0 += in ->linesize[0];
321	outrow0 += out->linesize[0];
322	}
323	} else {
324	/* planar */
325	for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
326	int vsub = plane == 1 \|\| plane == 2 ? s->vsub : 0;
327	int hsub = plane == 1 \|\| plane == 2 ? s->hsub : 0;
328	int h = FF_CEIL_RSHIFT(inlink->h, vsub);
329	int w = FF_CEIL_RSHIFT(inlink->w, hsub);
330
331	inrow = in ->data[plane];
332	outrow = out->data[plane];
333
334	for (i = 0; i < h; i++) {
335	const uint8_t *tab = s->lut[plane];
336	for (j = 0; j < w; j++)
337	outrow[j] = tab[inrow[j]];
338	inrow += in ->linesize[plane];
339	outrow += out->linesize[plane];
340	}
341	}
342	}
343
344	if (!direct)
345	av_frame_free(&in);
346
347	return ff_filter_frame(outlink, out);
348	}
349
350	static const AVFilterPad inputs[] = {
351	{ .name = "default",
352	.type = AVMEDIA_TYPE_VIDEO,
353	.filter_frame = filter_frame,
354	.config_props = config_props,
355	},
356	{ NULL }
357	};
358	static const AVFilterPad outputs[] = {
359	{ .name = "default",
360	.type = AVMEDIA_TYPE_VIDEO,
361	},
362	{ NULL }
363	};
364
365	#define DEFINE_LUT_FILTER(name_, description_) \
366	AVFilter ff_vf_##name_ = { \
367	.name = #name_, \
368	.description = NULL_IF_CONFIG_SMALL(description_), \
369	.priv_size = sizeof(LutContext), \
370	.priv_class = &name_ ## _class, \
371	.init = name_##_init, \
372	.uninit = uninit, \
373	.query_formats = query_formats, \
374	.inputs = inputs, \
375	.outputs = outputs, \
376	.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, \
377	}
378
379	#if CONFIG_LUT_FILTER
380
381	#define lut_options options
382	AVFILTER_DEFINE_CLASS(lut);
383
384	static int lut_init(AVFilterContext *ctx)
385	{
386	return 0;
387	}
388
389	DEFINE_LUT_FILTER(lut, "Compute and apply a lookup table to the RGB/YUV input video.");
390	#endif
391
392	#if CONFIG_LUTYUV_FILTER
393
394	#define lutyuv_options options
395	AVFILTER_DEFINE_CLASS(lutyuv);
396
397	static av_cold int lutyuv_init(AVFilterContext *ctx)
398	{
399	LutContext *s = ctx->priv;
400
401	s->is_yuv = 1;
402
403	return 0;
404	}
405
406	DEFINE_LUT_FILTER(lutyuv, "Compute and apply a lookup table to the YUV input video.");
407	#endif
408
409	#if CONFIG_LUTRGB_FILTER
410
411	#define lutrgb_options options
412	AVFILTER_DEFINE_CLASS(lutrgb);
413
414	static av_cold int lutrgb_init(AVFilterContext *ctx)
415	{
416	LutContext *s = ctx->priv;
417
418	s->is_rgb = 1;
419
420	return 0;
421	}
422
423	DEFINE_LUT_FILTER(lutrgb, "Compute and apply a lookup table to the RGB input video.");
424	#endif
425
426	#if CONFIG_NEGATE_FILTER
427
428	static const AVOption negate_options[] = {
429	{ "negate_alpha", NULL, OFFSET(negate_alpha), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
430	{ NULL }
431	};
432
433	AVFILTER_DEFINE_CLASS(negate);
434
435	static av_cold int negate_init(AVFilterContext *ctx)
436	{
437	LutContext *s = ctx->priv;
438	int i;
439
440	av_log(ctx, AV_LOG_DEBUG, "negate_alpha:%d\n", s->negate_alpha);
441
442	for (i = 0; i < 4; i++) {
443	s->comp_expr_str[i] = av_strdup((i == 3 && !s->negate_alpha) ?
444	"val" : "negval");
445	if (!s->comp_expr_str[i]) {
446	uninit(ctx);
447	return AVERROR(ENOMEM);
448	}
449	}
450
451	return 0;
452	}
453
454	DEFINE_LUT_FILTER(negate, "Negate input video.");
455
456	#endif