@@ -32,6 +32,7 @@ version <next>:

 - unpremultiply video filter

 - tlut2 video filter

 - floodfill video filter

+- pseudocolor video filter

 version 3.3:

 - CrystalHD decoder moved to new decode API

@@ -11785,6 +11785,51 @@ Set value which will be multiplied with filtered result.

 Set value which will be added to filtered result.

 @end table

+@section pseudocolor

+

+Alter frame colors in video with pseudocolors.

+

+This filter accept the following options:

+

+@table @option

+@item c0

+set pixel first component expression

+

+@item c1

+set pixel second component expression

+

+@item c2

+set pixel third component expression

+

+@item c3

+set pixel fourth component expression, corresponds to the alpha component

+

+@item i

+set component to use as base for altering colors

+@end table

+

+Each of them specifies the expression to use for computing the lookup table for

+the corresponding pixel component values.

+

+The expressions can contain the following constants and functions:

+

+@table @option

+@item w

+@item h

+The input width and height.

+

+@item val

+The input value for the pixel component.

+

+@item ymin, umin, vmin, amin

+The minimum allowed component value.

+

+@item ymax, umax, vmax, amax

+The maximum allowed component value.

+@end table

+

+All expressions default to "val".

+

 @section psnr

 Obtain the average, maximum and minimum PSNR (Peak Signal to Noise

@@ -259,6 +259,7 @@ OBJS-$(CONFIG_PP_FILTER)                     += vf_pp.o

 OBJS-$(CONFIG_PP7_FILTER)                    += vf_pp7.o

 OBJS-$(CONFIG_PREMULTIPLY_FILTER)            += vf_premultiply.o framesync2.o

 OBJS-$(CONFIG_PREWITT_FILTER)                += vf_convolution.o

+OBJS-$(CONFIG_PSEUDOCOLOR_FILTER)            += vf_pseudocolor.o

 OBJS-$(CONFIG_PSNR_FILTER)                   += vf_psnr.o dualinput.o framesync.o

 OBJS-$(CONFIG_PULLUP_FILTER)                 += vf_pullup.o

 OBJS-$(CONFIG_QP_FILTER)                     += vf_qp.o

@@ -270,6 +270,7 @@ static void register_all(void)

     REGISTER_FILTER(PP7,            pp7,            vf);

     REGISTER_FILTER(PREMULTIPLY,    premultiply,    vf);

     REGISTER_FILTER(PREWITT,        prewitt,        vf);

+    REGISTER_FILTER(PSEUDOCOLOR,    pseudocolor,    vf);

     REGISTER_FILTER(PSNR,           psnr,           vf);

     REGISTER_FILTER(PULLUP,         pullup,         vf);

     REGISTER_FILTER(QP,             qp,             vf);

@@ -30,7 +30,7 @@

 #include "libavutil/version.h"

 #define LIBAVFILTER_VERSION_MAJOR   6

-#define LIBAVFILTER_VERSION_MINOR  99

+#define LIBAVFILTER_VERSION_MINOR 100

 #define LIBAVFILTER_VERSION_MICRO 100

 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

new file mode 100644

@@ -0,0 +1,256 @@

+/*

+ * Copyright (c) 2017 Paul B Mahol

+ *

+ * 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 "libavutil/attributes.h"

+#include "libavutil/common.h"

+#include "libavutil/eval.h"

+#include "libavutil/imgutils.h"

+#include "libavutil/opt.h"

+#include "libavutil/pixdesc.h"

+#include "avfilter.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

+    "ymin",

+    "umin",

+    "vmin",

+    "amin",

+    "ymax",

+    "umax",

+    "vmax",

+    "amax",

+    NULL

+};

+

+enum var_name {

+    VAR_W,

+    VAR_H,

+    VAR_VAL,

+    VAR_YMIN,

+    VAR_UMIN,

+    VAR_VMIN,

+    VAR_AMIN,

+    VAR_YMAX,

+    VAR_UMAX,

+    VAR_VMAX,

+    VAR_AMAX,

+    VAR_VARS_NB

+};

+

+typedef struct PseudoColorContext {

+    const AVClass *class;

+    int max;

+    int index;

+    int nb_planes;

+    int color;

+    int linesize[4];

+    int width[4], height[4];

+    double var_values[VAR_VARS_NB];

+    char   *comp_expr_str[4];

+    AVExpr *comp_expr[4];

+    float lut[4][256];

+} PseudoColorContext;

+

+#define OFFSET(x) offsetof(PseudoColorContext, x)

+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

+

+static const AVOption pseudocolor_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 },

+    { "i",  "set component as base",       OFFSET(index),            AV_OPT_TYPE_INT,    {.i64=0}, 0, 3, .flags = FLAGS },

+    { NULL }

+};

+

+static const enum AVPixelFormat pix_fmts[] = {

+    AV_PIX_FMT_GRAY8,

+    AV_PIX_FMT_YUV444P, AV_PIX_FMT_GBRP,

+    AV_PIX_FMT_YUVA444P, AV_PIX_FMT_GBRAP,

+    AV_PIX_FMT_NONE

+};

+

+static int query_formats(AVFilterContext *ctx)

+{

+    AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);

+    if (!fmts_list)

+        return AVERROR(ENOMEM);

+    return ff_set_common_formats(ctx, fmts_list);

+}

+

+static int config_input(AVFilterLink *inlink)

+{

+    AVFilterContext *ctx = inlink->dst;

+    PseudoColorContext *s = ctx->priv;

+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);

+    int depth, ret, hsub, vsub, color;

+

+    depth = desc->comp[0].depth;

+    s->max = (1 << depth) - 1;

+    s->nb_planes = av_pix_fmt_count_planes(inlink->format);

+

+    if (s->index >= s->nb_planes) {

+        av_log(ctx, AV_LOG_ERROR, "index out of allowed range\n");

+        return AVERROR(EINVAL);

+    }

+

+    if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)

+        return ret;

+

+    hsub = desc->log2_chroma_w;

+    vsub = desc->log2_chroma_h;

+    s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, vsub);

+    s->height[0] = s->height[3] = inlink->h;

+    s->width[1]  = s->width[2]  = AV_CEIL_RSHIFT(inlink->w, hsub);

+    s->width[0]  = s->width[3]  = inlink->w;

+

+    s->var_values[VAR_W] = inlink->w;

+    s->var_values[VAR_H] = inlink->h;

+

+    s->var_values[VAR_YMIN] = 16 * (1 << (depth - 8));

+    s->var_values[VAR_UMIN] = 16 * (1 << (depth - 8));

+    s->var_values[VAR_VMIN] = 16 * (1 << (depth - 8));

+    s->var_values[VAR_AMIN] = 0;

+    s->var_values[VAR_YMAX] = 235 * (1 << (depth - 8));

+    s->var_values[VAR_UMAX] = 240 * (1 << (depth - 8));

+    s->var_values[VAR_VMAX] = 240 * (1 << (depth - 8));

+    s->var_values[VAR_AMAX] = s->max;

+

+    for (color = 0; color < s->nb_planes; color++) {

+        double res;

+        int val;

+

+        /* 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, NULL, NULL, 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[color], color, color);

+            return AVERROR(EINVAL);

+        }

+

+        /* compute the lut */

+        for (val = 0; val < FF_ARRAY_ELEMS(s->lut[color]); val++) {

+            s->var_values[VAR_VAL] = val;

+

+            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, color);

+                return AVERROR(EINVAL);

+            }

+            s->lut[color][val] = res;

+        }

+    }

+

+    return 0;

+}

+

+static int filter_frame(AVFilterLink *inlink, AVFrame *in)

+{

+    AVFilterContext *ctx = inlink->dst;

+    PseudoColorContext *s = ctx->priv;

+    AVFilterLink *outlink = ctx->outputs[0];

+    AVFrame *out;

+    int x, y, plane;

+

+    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);

+

+    for (plane = 0; plane < s->nb_planes; plane++) {

+        const uint8_t *index = in->data[s->index];

+        const uint8_t *src = in->data[plane];

+        uint8_t *dst = out->data[plane];

+

+        for (y = 0; y < s->height[plane]; y++) {

+            for (x = 0; x < s->width[plane]; x++) {

+                int v = s->lut[plane][index[x]];

+

+                if (v >= 0 && v <= s->max) {

+                    dst[x] = v;

+                } else {

+                    dst[x] = src[x];

+                }

+            }

+            index += in->linesize[s->index];

+            src += in->linesize[plane];

+            dst += out->linesize[plane];

+        }

+    }

+

+    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_input,

+    },

+    { NULL }

+};

+

+static const AVFilterPad outputs[] = {

+    {

+        .name = "default",

+        .type = AVMEDIA_TYPE_VIDEO,

+    },

+    { NULL }

+};

+

+static av_cold void uninit(AVFilterContext *ctx)

+{

+    PseudoColorContext *s = ctx->priv;

+    int i;

+

+    for (i = 0; i < 4; i++) {

+        av_expr_free(s->comp_expr[i]);

+        s->comp_expr[i] = NULL;

+    }

+}

+

+AVFILTER_DEFINE_CLASS(pseudocolor);

+

+AVFilter ff_vf_pseudocolor = {

+    .name          = "pseudocolor",

+    .description   = NULL_IF_CONFIG_SMALL("Make pseudocolored video frames."),

+    .priv_size     = sizeof(PseudoColorContext),

+    .priv_class    = &pseudocolor_class,

+    .uninit        = uninit,

+    .query_formats = query_formats,

+    .inputs        = inputs,

+    .outputs       = outputs,

+    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

+};