414 lines
14 KiB
C
414 lines
14 KiB
C
/*
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* Copyright (c) 2011 Stefano Sabatini
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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/attributes.h"
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#include "libavutil/common.h"
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#include "libavutil/eval.h"
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#include "libavutil/mathematics.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 "formats.h"
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#include "internal.h"
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#include "video.h"
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static const char *const 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 LutContext {
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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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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption lut_options[] = {
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{ "c0", "set component #0 expression", OFFSET(comp_expr_str[0]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
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{ "c1", "set component #1 expression", OFFSET(comp_expr_str[1]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
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{ "c2", "set component #2 expression", OFFSET(comp_expr_str[2]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
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{ "c3", "set component #3 expression", OFFSET(comp_expr_str[3]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
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{ "y", "set Y expression", OFFSET(comp_expr_str[Y]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
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{ "u", "set U expression", OFFSET(comp_expr_str[U]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
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{ "v", "set V expression", OFFSET(comp_expr_str[V]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
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{ "r", "set R expression", OFFSET(comp_expr_str[R]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
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{ "g", "set G expression", OFFSET(comp_expr_str[G]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
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{ "b", "set B expression", OFFSET(comp_expr_str[B]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
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{ "a", "set A expression", OFFSET(comp_expr_str[A]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
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{ NULL },
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};
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static av_cold int init(AVFilterContext *ctx)
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{
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LutContext *s = ctx->priv;
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s->var_values[VAR_PHI] = M_PHI;
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s->var_values[VAR_PI] = M_PI;
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s->var_values[VAR_E ] = M_E;
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s->is_rgb = !strcmp(ctx->filter->name, "lutrgb");
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s->is_yuv = !strcmp(ctx->filter->name, "lutyuv");
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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 *s = 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(s->comp_expr[i]);
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s->comp_expr[i] = NULL;
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av_freep(&s->comp_expr_str[i]);
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}
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}
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#define YUV_FORMATS \
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, \
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AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, \
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AV_PIX_FMT_YUVA420P, \
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P, \
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AV_PIX_FMT_YUVJ440P
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#define RGB_FORMATS \
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AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA, \
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AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA, \
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AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24
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static const enum AVPixelFormat yuv_pix_fmts[] = { YUV_FORMATS, AV_PIX_FMT_NONE };
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static const enum AVPixelFormat rgb_pix_fmts[] = { RGB_FORMATS, AV_PIX_FMT_NONE };
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static const enum AVPixelFormat all_pix_fmts[] = { RGB_FORMATS, YUV_FORMATS, AV_PIX_FMT_NONE };
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static int query_formats(AVFilterContext *ctx)
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{
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LutContext *s = ctx->priv;
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const enum AVPixelFormat *pix_fmts = s->is_rgb ? rgb_pix_fmts :
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s->is_yuv ? yuv_pix_fmts :
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all_pix_fmts;
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ff_set_common_formats(ctx, ff_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 *s = opaque;
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double minval = s->var_values[VAR_MINVAL];
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double maxval = s->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 *s = opaque;
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double val = s->var_values[VAR_CLIPVAL];
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double minval = s->var_values[VAR_MINVAL];
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double maxval = s->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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clip,
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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 *s = ctx->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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int min[4], max[4];
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int val, comp, ret;
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s->hsub = desc->log2_chroma_w;
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s->vsub = desc->log2_chroma_h;
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s->var_values[VAR_W] = inlink->w;
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s->var_values[VAR_H] = inlink->h;
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switch (inlink->format) {
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case AV_PIX_FMT_YUV410P:
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case AV_PIX_FMT_YUV411P:
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case AV_PIX_FMT_YUV420P:
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case AV_PIX_FMT_YUV422P:
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case AV_PIX_FMT_YUV440P:
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case AV_PIX_FMT_YUV444P:
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case AV_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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s->is_yuv = s->is_rgb = 0;
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if (ff_fmt_is_in(inlink->format, yuv_pix_fmts)) s->is_yuv = 1;
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else if (ff_fmt_is_in(inlink->format, rgb_pix_fmts)) s->is_rgb = 1;
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if (s->is_rgb) {
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switch (inlink->format) {
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case AV_PIX_FMT_ARGB: s->rgba_map[A] = 0; s->rgba_map[R] = 1; s->rgba_map[G] = 2; s->rgba_map[B] = 3; break;
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case AV_PIX_FMT_ABGR: s->rgba_map[A] = 0; s->rgba_map[B] = 1; s->rgba_map[G] = 2; s->rgba_map[R] = 3; break;
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case AV_PIX_FMT_RGBA:
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case AV_PIX_FMT_RGB24: s->rgba_map[R] = 0; s->rgba_map[G] = 1; s->rgba_map[B] = 2; s->rgba_map[A] = 3; break;
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case AV_PIX_FMT_BGRA:
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case AV_PIX_FMT_BGR24: s->rgba_map[B] = 0; s->rgba_map[G] = 1; s->rgba_map[R] = 2; s->rgba_map[A] = 3; break;
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}
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s->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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av_expr_free(s->comp_expr[comp]);
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s->comp_expr[comp] = NULL;
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ret = av_expr_parse(&s->comp_expr[comp], s->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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s->comp_expr_str[comp], comp);
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return AVERROR(EINVAL);
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}
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/* compute the s */
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s->var_values[VAR_MAXVAL] = max[comp];
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s->var_values[VAR_MINVAL] = min[comp];
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for (val = 0; val < 256; val++) {
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s->var_values[VAR_VAL] = val;
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s->var_values[VAR_CLIPVAL] = av_clip(val, min[comp], max[comp]);
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s->var_values[VAR_NEGVAL] =
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av_clip(min[comp] + max[comp] - s->var_values[VAR_VAL],
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min[comp], max[comp]);
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res = av_expr_eval(s->comp_expr[comp], s->var_values, s);
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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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s->comp_expr_str[comp], val, comp);
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return AVERROR(EINVAL);
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}
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s->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, s->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 int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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LutContext *s = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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AVFrame *out;
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uint8_t *inrow, *outrow, *inrow0, *outrow0;
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int i, j, k, plane;
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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if (s->is_rgb) {
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/* packed */
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inrow0 = in ->data[0];
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outrow0 = out->data[0];
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for (i = 0; i < in->height; 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 < s->step; k++)
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outrow[k] = s->lut[s->rgba_map[k]][inrow[k]];
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outrow += s->step;
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inrow += s->step;
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}
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inrow0 += in ->linesize[0];
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outrow0 += out->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 && in->data[plane]; plane++) {
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int vsub = plane == 1 || plane == 2 ? s->vsub : 0;
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int hsub = plane == 1 || plane == 2 ? s->hsub : 0;
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inrow = in ->data[plane];
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outrow = out->data[plane];
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for (i = 0; i < in->height >> vsub; i ++) {
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for (j = 0; j < inlink->w>>hsub; j++)
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outrow[j] = s->lut[plane][inrow[j]];
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inrow += in ->linesize[plane];
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outrow += out->linesize[plane];
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}
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}
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}
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av_frame_free(&in);
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return ff_filter_frame(outlink, out);
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}
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static const AVFilterPad inputs[] = {
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{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = config_props,
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},
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{ .name = NULL}
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};
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static const AVFilterPad outputs[] = {
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{ .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 DEFINE_LUT_FILTER(name_, description_, init_, options) \
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static const AVClass name_ ## _class = { \
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.class_name = #name_, \
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.item_name = av_default_item_name, \
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.option = options, \
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.version = LIBAVUTIL_VERSION_INT, \
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}; \
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AVFilter ff_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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.priv_class = &name_ ## _class, \
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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 = inputs, \
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.outputs = outputs, \
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}
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#if CONFIG_LUT_FILTER
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DEFINE_LUT_FILTER(lut, "Compute and apply a lookup table to the RGB/YUV input video.", init, lut_options);
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#endif
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#if CONFIG_LUTYUV_FILTER
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DEFINE_LUT_FILTER(lutyuv, "Compute and apply a lookup table to the YUV input video.", init, lut_options);
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#endif
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#if CONFIG_LUTRGB_FILTER
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DEFINE_LUT_FILTER(lutrgb, "Compute and apply a lookup table to the RGB input video.", init, lut_options);
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#endif
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#if CONFIG_NEGATE_FILTER
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static const AVOption negate_options[] = {
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{ "negate_alpha", NULL, OFFSET(negate_alpha), AV_OPT_TYPE_INT, { .i64 = 0 }, .flags = FLAGS },
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{ NULL },
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};
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static av_cold int negate_init(AVFilterContext *ctx)
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{
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LutContext *s = ctx->priv;
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int i;
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av_log(ctx, AV_LOG_DEBUG, "negate_alpha:%d\n", s->negate_alpha);
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for (i = 0; i < 4; i++) {
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s->comp_expr_str[i] = av_strdup((i == 3 && s->negate_alpha) ?
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"val" : "negval");
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if (!s->comp_expr_str[i]) {
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uninit(ctx);
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return AVERROR(ENOMEM);
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}
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}
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return init(ctx);
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}
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DEFINE_LUT_FILTER(negate, "Negate input video.", negate_init, negate_options);
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#endif
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