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avfilter: add pseudocolor filter

tags/n3.4
Paul B Mahol 7 years ago
parent
3c99523a28
commit
e3a4afca07
6 changed files with 305 additions and 1 deletions
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  1. +1
    -0
      Changelog
  2. +45
    -0
      doc/filters.texi
  3. +1
    -0
      libavfilter/Makefile
  4. +1
    -0
      libavfilter/allfilters.c
  5. +1
    -1
      libavfilter/version.h
  6. +256
    -0
      libavfilter/vf_pseudocolor.c

+ 1
- 0
Changelog View File

@@ -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


+ 45
- 0
doc/filters.texi View File

@@ -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


+ 1
- 0
libavfilter/Makefile View File

@@ -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


+ 1
- 0
libavfilter/allfilters.c View File

@@ -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);


+ 1
- 1
libavfilter/version.h View File

@@ -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, \


+ 256
- 0
libavfilter/vf_pseudocolor.c View File

@@ -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,
};

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