388 lines
13 KiB
C
388 lines
13 KiB
C
/*
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* Copyright (c) 2011 Stefano Sabatini
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*
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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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/**
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* @file
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* Compute a look-up table for binding the input value to the output
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* value, and apply it to input video.
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*/
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#include "libavutil/eval.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "internal.h"
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static const char *var_names[] = {
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"E",
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"PHI",
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"PI",
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"w", ///< width of the input video
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"h", ///< height of the input video
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"val", ///< input value for the pixel
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"maxval", ///< max value for the pixel
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"minval", ///< min value for the pixel
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"negval", ///< negated value
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"clipval",
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NULL
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};
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enum var_name {
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VAR_E,
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VAR_PHI,
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VAR_PI,
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VAR_W,
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VAR_H,
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VAR_VAL,
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VAR_MAXVAL,
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VAR_MINVAL,
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VAR_NEGVAL,
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VAR_CLIPVAL,
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VAR_VARS_NB
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};
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typedef struct {
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const AVClass *class;
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uint8_t lut[4][256]; ///< lookup table for each component
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char *comp_expr_str[4];
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AVExpr *comp_expr[4];
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int hsub, vsub;
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double var_values[VAR_VARS_NB];
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int is_rgb, is_yuv;
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int rgba_map[4];
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int step;
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int negate_alpha; /* only used by negate */
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} LutContext;
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#define Y 0
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#define U 1
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#define V 2
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#define R 0
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#define G 1
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#define B 2
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#define A 3
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#define OFFSET(x) offsetof(LutContext, x)
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static const AVOption lut_options[] = {
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{"c0", "set component #0 expression", OFFSET(comp_expr_str[0]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX},
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{"c1", "set component #1 expression", OFFSET(comp_expr_str[1]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX},
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{"c2", "set component #2 expression", OFFSET(comp_expr_str[2]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX},
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{"c3", "set component #3 expression", OFFSET(comp_expr_str[3]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX},
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{"y", "set Y expression", OFFSET(comp_expr_str[Y]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX},
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{"u", "set U expression", OFFSET(comp_expr_str[U]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX},
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{"v", "set V expression", OFFSET(comp_expr_str[V]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX},
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{"r", "set R expression", OFFSET(comp_expr_str[R]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX},
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{"g", "set G expression", OFFSET(comp_expr_str[G]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX},
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{"b", "set B expression", OFFSET(comp_expr_str[B]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX},
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{"a", "set A expression", OFFSET(comp_expr_str[A]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX},
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{NULL},
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};
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static const char *lut_get_name(void *ctx)
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{
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return "lut";
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}
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static const AVClass lut_class = {
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"LutContext",
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lut_get_name,
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lut_options
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};
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static int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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LutContext *lut = ctx->priv;
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int ret;
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lut->class = &lut_class;
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av_opt_set_defaults(lut);
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lut->var_values[VAR_PHI] = M_PHI;
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lut->var_values[VAR_PI] = M_PI;
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lut->var_values[VAR_E ] = M_E;
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lut->is_rgb = !strcmp(ctx->filter->name, "lutrgb");
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lut->is_yuv = !strcmp(ctx->filter->name, "lutyuv");
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if (args && (ret = av_set_options_string(lut, args, "=", ":")) < 0)
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return ret;
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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LutContext *lut = ctx->priv;
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int i;
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for (i = 0; i < 4; i++) {
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av_expr_free(lut->comp_expr[i]);
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lut->comp_expr[i] = NULL;
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av_freep(&lut->comp_expr_str[i]);
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}
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}
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#define YUV_FORMATS \
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PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P, \
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PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_YUV440P, \
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PIX_FMT_YUVA420P, \
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PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P, \
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PIX_FMT_YUVJ440P
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#define RGB_FORMATS \
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PIX_FMT_ARGB, PIX_FMT_RGBA, \
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PIX_FMT_ABGR, PIX_FMT_BGRA, \
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PIX_FMT_RGB24, PIX_FMT_BGR24
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static enum PixelFormat yuv_pix_fmts[] = { YUV_FORMATS, PIX_FMT_NONE };
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static enum PixelFormat rgb_pix_fmts[] = { RGB_FORMATS, PIX_FMT_NONE };
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static enum PixelFormat all_pix_fmts[] = { RGB_FORMATS, YUV_FORMATS, PIX_FMT_NONE };
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static int query_formats(AVFilterContext *ctx)
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{
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LutContext *lut = ctx->priv;
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enum PixelFormat *pix_fmts = lut->is_rgb ? rgb_pix_fmts :
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lut->is_yuv ? yuv_pix_fmts : all_pix_fmts;
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avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
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return 0;
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}
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/**
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* Clip value val in the minval - maxval range.
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*/
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static double clip(void *opaque, double val)
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{
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LutContext *lut = opaque;
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double minval = lut->var_values[VAR_MINVAL];
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double maxval = lut->var_values[VAR_MAXVAL];
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return av_clip(val, minval, maxval);
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}
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/**
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* Compute gamma correction for value val, assuming the minval-maxval
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* range, val is clipped to a value contained in the same interval.
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*/
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static double compute_gammaval(void *opaque, double gamma)
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{
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LutContext *lut = opaque;
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double val = lut->var_values[VAR_CLIPVAL];
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double minval = lut->var_values[VAR_MINVAL];
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double maxval = lut->var_values[VAR_MAXVAL];
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return pow((val-minval)/(maxval-minval), gamma) * (maxval-minval)+minval;
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}
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static double (* const funcs1[])(void *, double) = {
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(void *)clip,
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(void *)compute_gammaval,
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NULL
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};
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static const char * const funcs1_names[] = {
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"clip",
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"gammaval",
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NULL
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};
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static int config_props(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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LutContext *lut = ctx->priv;
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const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[inlink->format];
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int min[4], max[4];
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int val, comp, ret;
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lut->hsub = desc->log2_chroma_w;
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lut->vsub = desc->log2_chroma_h;
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lut->var_values[VAR_W] = inlink->w;
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lut->var_values[VAR_H] = inlink->h;
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switch (inlink->format) {
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case PIX_FMT_YUV410P:
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case PIX_FMT_YUV411P:
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case PIX_FMT_YUV420P:
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case PIX_FMT_YUV422P:
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case PIX_FMT_YUV440P:
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case PIX_FMT_YUV444P:
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case PIX_FMT_YUVA420P:
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min[Y] = min[U] = min[V] = 16;
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max[Y] = 235;
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max[U] = max[V] = 240;
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min[A] = 0; max[A] = 255;
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break;
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default:
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min[0] = min[1] = min[2] = min[3] = 0;
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max[0] = max[1] = max[2] = max[3] = 255;
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}
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lut->is_yuv = lut->is_rgb = 0;
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if (ff_fmt_is_in(inlink->format, yuv_pix_fmts)) lut->is_yuv = 1;
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else if (ff_fmt_is_in(inlink->format, rgb_pix_fmts)) lut->is_rgb = 1;
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if (lut->is_rgb) {
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switch (inlink->format) {
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case PIX_FMT_ARGB: lut->rgba_map[A] = 0; lut->rgba_map[R] = 1; lut->rgba_map[G] = 2; lut->rgba_map[B] = 3; break;
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case PIX_FMT_ABGR: lut->rgba_map[A] = 0; lut->rgba_map[B] = 1; lut->rgba_map[G] = 2; lut->rgba_map[R] = 3; break;
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case PIX_FMT_RGBA:
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case PIX_FMT_RGB24: lut->rgba_map[R] = 0; lut->rgba_map[G] = 1; lut->rgba_map[B] = 2; lut->rgba_map[A] = 3; break;
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case PIX_FMT_BGRA:
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case PIX_FMT_BGR24: lut->rgba_map[B] = 0; lut->rgba_map[G] = 1; lut->rgba_map[R] = 2; lut->rgba_map[A] = 3; break;
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}
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lut->step = av_get_bits_per_pixel(desc) >> 3;
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}
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for (comp = 0; comp < desc->nb_components; comp++) {
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double res;
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/* create the parsed expression */
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ret = av_expr_parse(&lut->comp_expr[comp], lut->comp_expr_str[comp],
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var_names, funcs1_names, funcs1, NULL, NULL, 0, ctx);
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if (ret < 0) {
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av_log(ctx, AV_LOG_ERROR,
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"Error when parsing the expression '%s' for the component %d.\n",
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lut->comp_expr_str[comp], comp);
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return AVERROR(EINVAL);
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}
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/* compute the lut */
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lut->var_values[VAR_MAXVAL] = max[comp];
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lut->var_values[VAR_MINVAL] = min[comp];
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for (val = 0; val < 256; val++) {
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lut->var_values[VAR_VAL] = val;
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lut->var_values[VAR_CLIPVAL] = av_clip(val, min[comp], max[comp]);
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lut->var_values[VAR_NEGVAL] =
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av_clip(min[comp] + max[comp] - lut->var_values[VAR_VAL],
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min[comp], max[comp]);
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res = av_expr_eval(lut->comp_expr[comp], lut->var_values, lut);
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if (isnan(res)) {
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av_log(ctx, AV_LOG_ERROR,
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"Error when evaluating the expression '%s' for the value %d for the component #%d.\n",
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lut->comp_expr_str[comp], val, comp);
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return AVERROR(EINVAL);
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}
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lut->lut[comp][val] = av_clip((int)res, min[comp], max[comp]);
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av_log(ctx, AV_LOG_DEBUG, "val[%d][%d] = %d\n", comp, val, lut->lut[comp][val]);
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}
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}
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return 0;
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}
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static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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{
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AVFilterContext *ctx = inlink->dst;
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LutContext *lut = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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AVFilterBufferRef *inpic = inlink ->cur_buf;
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AVFilterBufferRef *outpic = outlink->out_buf;
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uint8_t *inrow, *outrow, *inrow0, *outrow0;
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int i, j, k, plane;
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if (lut->is_rgb) {
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/* packed */
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inrow0 = inpic ->data[0] + y * inpic ->linesize[0];
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outrow0 = outpic->data[0] + y * outpic->linesize[0];
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for (i = 0; i < h; i ++) {
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inrow = inrow0;
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outrow = outrow0;
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for (j = 0; j < inlink->w; j++) {
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for (k = 0; k < lut->step; k++)
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outrow[k] = lut->lut[lut->rgba_map[k]][inrow[k]];
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outrow += lut->step;
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inrow += lut->step;
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}
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inrow0 += inpic ->linesize[0];
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outrow0 += outpic->linesize[0];
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}
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} else {
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/* planar */
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for (plane = 0; plane < 4 && inpic->data[plane]; plane++) {
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int vsub = plane == 1 || plane == 2 ? lut->vsub : 0;
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int hsub = plane == 1 || plane == 2 ? lut->hsub : 0;
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inrow = inpic ->data[plane] + (y>>vsub) * inpic ->linesize[plane];
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outrow = outpic->data[plane] + (y>>vsub) * outpic->linesize[plane];
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for (i = 0; i < h>>vsub; i ++) {
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for (j = 0; j < inlink->w>>hsub; j++)
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outrow[j] = lut->lut[plane][inrow[j]];
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inrow += inpic ->linesize[plane];
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outrow += outpic->linesize[plane];
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}
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}
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}
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avfilter_draw_slice(outlink, y, h, slice_dir);
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}
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#define DEFINE_LUT_FILTER(name_, description_, init_) \
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AVFilter avfilter_vf_##name_ = { \
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.name = #name_, \
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.description = NULL_IF_CONFIG_SMALL(description_), \
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.priv_size = sizeof(LutContext), \
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\
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.init = init_, \
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.uninit = uninit, \
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.query_formats = query_formats, \
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\
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.inputs = (AVFilterPad[]) {{ .name = "default", \
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.type = AVMEDIA_TYPE_VIDEO, \
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.draw_slice = draw_slice, \
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.config_props = config_props, \
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.min_perms = AV_PERM_READ, }, \
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{ .name = NULL}}, \
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.outputs = (AVFilterPad[]) {{ .name = "default", \
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.type = AVMEDIA_TYPE_VIDEO, }, \
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{ .name = NULL}}, \
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}
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DEFINE_LUT_FILTER(lut, "Compute and apply a lookup table to the RGB/YUV input video.", init);
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DEFINE_LUT_FILTER(lutyuv, "Compute and apply a lookup table to the YUV input video.", init);
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DEFINE_LUT_FILTER(lutrgb, "Compute and apply a lookup table to the RGB input video.", init);
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#if CONFIG_NEGATE_FILTER
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static int negate_init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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LutContext *lut = ctx->priv;
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char lut_params[1024];
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if (args)
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sscanf(args, "%d", &lut->negate_alpha);
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av_log(ctx, AV_LOG_INFO, "negate_alpha:%d\n", lut->negate_alpha);
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snprintf(lut_params, sizeof(lut_params), "c0=negval:c1=negval:c2=negval:a=%s",
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lut->negate_alpha ? "negval" : "val");
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return init(ctx, lut_params, opaque);
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}
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DEFINE_LUT_FILTER(negate, "Negate input video.", negate_init);
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#endif
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