mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
592 lines
20 KiB
C
592 lines
20 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/attributes.h"
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#include "libavutil/bswap.h"
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#include "libavutil/common.h"
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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 "drawutils.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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"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_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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uint16_t lut[4][256 * 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 is_planar;
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int is_16bit;
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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_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption options[] = {
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{ "c0", "set component #0 expression", OFFSET(comp_expr_str[0]), AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
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{ "c1", "set component #1 expression", OFFSET(comp_expr_str[1]), AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
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{ "c2", "set component #2 expression", OFFSET(comp_expr_str[2]), AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
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{ "c3", "set component #3 expression", OFFSET(comp_expr_str[3]), AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
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{ "y", "set Y expression", OFFSET(comp_expr_str[Y]), AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
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{ "u", "set U expression", OFFSET(comp_expr_str[U]), AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
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{ "v", "set V expression", OFFSET(comp_expr_str[V]), AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
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{ "r", "set R expression", OFFSET(comp_expr_str[R]), AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
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{ "g", "set G expression", OFFSET(comp_expr_str[G]), AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
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{ "b", "set B expression", OFFSET(comp_expr_str[B]), AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
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{ "a", "set A expression", OFFSET(comp_expr_str[A]), AV_OPT_TYPE_STRING, { .str = "clipval" }, .flags = FLAGS },
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{ NULL }
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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, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P, \
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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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AV_PIX_FMT_YUV444P9LE, AV_PIX_FMT_YUV422P9LE, AV_PIX_FMT_YUV420P9LE, \
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AV_PIX_FMT_YUV444P10LE, AV_PIX_FMT_YUV422P10LE, AV_PIX_FMT_YUV420P10LE, AV_PIX_FMT_YUV440P10LE, \
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AV_PIX_FMT_YUV444P12LE, AV_PIX_FMT_YUV422P12LE, AV_PIX_FMT_YUV420P12LE, AV_PIX_FMT_YUV440P12LE, \
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AV_PIX_FMT_YUV444P14LE, AV_PIX_FMT_YUV422P14LE, AV_PIX_FMT_YUV420P14LE, \
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AV_PIX_FMT_YUV444P16LE, AV_PIX_FMT_YUV422P16LE, AV_PIX_FMT_YUV420P16LE, \
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AV_PIX_FMT_YUVA444P16LE, AV_PIX_FMT_YUVA422P16LE, AV_PIX_FMT_YUVA420P16LE
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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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AV_PIX_FMT_RGB48LE, AV_PIX_FMT_RGBA64LE, \
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AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, \
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AV_PIX_FMT_GBRP9LE, AV_PIX_FMT_GBRP10LE, \
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AV_PIX_FMT_GBRAP10LE, \
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AV_PIX_FMT_GBRP12LE, AV_PIX_FMT_GBRP14LE, \
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AV_PIX_FMT_GBRP16LE, AV_PIX_FMT_GBRAP12LE, \
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AV_PIX_FMT_GBRAP16LE
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#define GRAY_FORMATS \
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AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9LE, AV_PIX_FMT_GRAY10LE, \
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AV_PIX_FMT_GRAY12LE, AV_PIX_FMT_GRAY16LE
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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, GRAY_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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AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
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if (!fmts_list)
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return AVERROR(ENOMEM);
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return ff_set_common_formats(ctx, fmts_list);
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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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/**
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* Compute ITU Rec.709 gamma correction of value val.
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*/
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static double compute_gammaval709(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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double level = (val - minval) / (maxval - minval);
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level = level < 0.018 ? 4.5 * level
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: 1.099 * pow(level, 1.0 / gamma) - 0.099;
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return level * (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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compute_gammaval709,
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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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"gammaval709",
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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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uint8_t rgba_map[4]; /* component index -> RGBA color index map */
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int min[4], max[4];
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int val, color, 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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s->is_16bit = desc->comp[0].depth > 8;
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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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case AV_PIX_FMT_YUVA422P:
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case AV_PIX_FMT_YUVA444P:
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case AV_PIX_FMT_YUV420P9LE:
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case AV_PIX_FMT_YUV422P9LE:
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case AV_PIX_FMT_YUV444P9LE:
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case AV_PIX_FMT_YUVA420P9LE:
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case AV_PIX_FMT_YUVA422P9LE:
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case AV_PIX_FMT_YUVA444P9LE:
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case AV_PIX_FMT_YUV420P10LE:
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case AV_PIX_FMT_YUV422P10LE:
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case AV_PIX_FMT_YUV440P10LE:
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case AV_PIX_FMT_YUV444P10LE:
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case AV_PIX_FMT_YUVA420P10LE:
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case AV_PIX_FMT_YUVA422P10LE:
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case AV_PIX_FMT_YUVA444P10LE:
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case AV_PIX_FMT_YUV420P12LE:
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case AV_PIX_FMT_YUV422P12LE:
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case AV_PIX_FMT_YUV440P12LE:
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case AV_PIX_FMT_YUV444P12LE:
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case AV_PIX_FMT_YUV420P14LE:
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case AV_PIX_FMT_YUV422P14LE:
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case AV_PIX_FMT_YUV444P14LE:
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case AV_PIX_FMT_YUV420P16LE:
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case AV_PIX_FMT_YUV422P16LE:
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case AV_PIX_FMT_YUV444P16LE:
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case AV_PIX_FMT_YUVA420P16LE:
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case AV_PIX_FMT_YUVA422P16LE:
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case AV_PIX_FMT_YUVA444P16LE:
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min[Y] = 16 * (1 << (desc->comp[0].depth - 8));
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min[U] = 16 * (1 << (desc->comp[1].depth - 8));
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min[V] = 16 * (1 << (desc->comp[2].depth - 8));
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min[A] = 0;
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max[Y] = 235 * (1 << (desc->comp[0].depth - 8));
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max[U] = 240 * (1 << (desc->comp[1].depth - 8));
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max[V] = 240 * (1 << (desc->comp[2].depth - 8));
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max[A] = (1 << desc->comp[0].depth) - 1;
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break;
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case AV_PIX_FMT_RGB48LE:
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case AV_PIX_FMT_RGBA64LE:
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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] = 65535;
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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 * (1 << (desc->comp[0].depth - 8));
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}
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s->is_yuv = s->is_rgb = 0;
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s->is_planar = desc->flags & AV_PIX_FMT_FLAG_PLANAR;
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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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ff_fill_rgba_map(rgba_map, inlink->format);
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s->step = av_get_bits_per_pixel(desc) >> 3;
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if (s->is_16bit) {
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s->step = s->step >> 1;
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}
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}
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for (color = 0; color < desc->nb_components; color++) {
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double res;
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int comp = s->is_rgb ? rgba_map[color] : color;
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/* create the parsed expression */
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av_expr_free(s->comp_expr[color]);
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s->comp_expr[color] = NULL;
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ret = av_expr_parse(&s->comp_expr[color], s->comp_expr_str[color],
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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 and color %d.\n",
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s->comp_expr_str[comp], comp, color);
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return AVERROR(EINVAL);
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}
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/* compute the lut */
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s->var_values[VAR_MAXVAL] = max[color];
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s->var_values[VAR_MINVAL] = min[color];
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for (val = 0; val < FF_ARRAY_ELEMS(s->lut[comp]); val++) {
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s->var_values[VAR_VAL] = val;
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s->var_values[VAR_CLIPVAL] = av_clip(val, min[color], max[color]);
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s->var_values[VAR_NEGVAL] =
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av_clip(min[color] + max[color] - s->var_values[VAR_VAL],
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min[color], max[color]);
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res = av_expr_eval(s->comp_expr[color], 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[color], 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, 0, max[A]);
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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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int i, j, plane, direct = 0;
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if (av_frame_is_writable(in)) {
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direct = 1;
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out = in;
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} else {
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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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}
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if (s->is_rgb && s->is_16bit && !s->is_planar) {
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/* packed, 16-bit */
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uint16_t *inrow, *outrow, *inrow0, *outrow0;
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const int w = inlink->w;
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const int h = in->height;
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const uint16_t (*tab)[256*256] = (const uint16_t (*)[256*256])s->lut;
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const int in_linesize = in->linesize[0] / 2;
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const int out_linesize = out->linesize[0] / 2;
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const int step = s->step;
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inrow0 = (uint16_t*) in ->data[0];
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outrow0 = (uint16_t*) out->data[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 < w; j++) {
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switch (step) {
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#if HAVE_BIGENDIAN
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case 4: outrow[3] = av_bswap16(tab[3][av_bswap16(inrow[3])]); // Fall-through
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case 3: outrow[2] = av_bswap16(tab[2][av_bswap16(inrow[2])]); // Fall-through
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case 2: outrow[1] = av_bswap16(tab[1][av_bswap16(inrow[1])]); // Fall-through
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default: outrow[0] = av_bswap16(tab[0][av_bswap16(inrow[0])]);
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#else
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case 4: outrow[3] = tab[3][inrow[3]]; // Fall-through
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case 3: outrow[2] = tab[2][inrow[2]]; // Fall-through
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case 2: outrow[1] = tab[1][inrow[1]]; // Fall-through
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default: outrow[0] = tab[0][inrow[0]];
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#endif
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}
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outrow += step;
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inrow += step;
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}
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inrow0 += in_linesize;
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outrow0 += out_linesize;
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}
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} else if (s->is_rgb && !s->is_planar) {
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/* packed */
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uint8_t *inrow, *outrow, *inrow0, *outrow0;
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|
const int w = inlink->w;
|
|
const int h = in->height;
|
|
const uint16_t (*tab)[256*256] = (const uint16_t (*)[256*256])s->lut;
|
|
const int in_linesize = in->linesize[0];
|
|
const int out_linesize = out->linesize[0];
|
|
const int step = s->step;
|
|
|
|
inrow0 = in ->data[0];
|
|
outrow0 = out->data[0];
|
|
|
|
for (i = 0; i < h; i ++) {
|
|
inrow = inrow0;
|
|
outrow = outrow0;
|
|
for (j = 0; j < w; j++) {
|
|
switch (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 += step;
|
|
inrow += step;
|
|
}
|
|
inrow0 += in_linesize;
|
|
outrow0 += out_linesize;
|
|
}
|
|
} else if (s->is_16bit) {
|
|
// planar >8 bit depth
|
|
uint16_t *inrow, *outrow;
|
|
|
|
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 = AV_CEIL_RSHIFT(inlink->h, vsub);
|
|
int w = AV_CEIL_RSHIFT(inlink->w, hsub);
|
|
const uint16_t *tab = s->lut[plane];
|
|
const int in_linesize = in->linesize[plane] / 2;
|
|
const int out_linesize = out->linesize[plane] / 2;
|
|
|
|
inrow = (uint16_t *)in ->data[plane];
|
|
outrow = (uint16_t *)out->data[plane];
|
|
|
|
for (i = 0; i < h; i++) {
|
|
for (j = 0; j < w; j++) {
|
|
#if HAVE_BIGENDIAN
|
|
outrow[j] = av_bswap16(tab[av_bswap16(inrow[j])]);
|
|
#else
|
|
outrow[j] = tab[inrow[j]];
|
|
#endif
|
|
}
|
|
inrow += in_linesize;
|
|
outrow += out_linesize;
|
|
}
|
|
}
|
|
} else {
|
|
/* planar 8bit depth */
|
|
uint8_t *inrow, *outrow;
|
|
|
|
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 = AV_CEIL_RSHIFT(inlink->h, vsub);
|
|
int w = AV_CEIL_RSHIFT(inlink->w, hsub);
|
|
const uint16_t *tab = s->lut[plane];
|
|
const int in_linesize = in->linesize[plane];
|
|
const int out_linesize = out->linesize[plane];
|
|
|
|
inrow = in ->data[plane];
|
|
outrow = out->data[plane];
|
|
|
|
for (i = 0; i < h; i++) {
|
|
for (j = 0; j < w; j++)
|
|
outrow[j] = tab[inrow[j]];
|
|
inrow += in_linesize;
|
|
outrow += out_linesize;
|
|
}
|
|
}
|
|
}
|
|
|
|
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_BOOL, { .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
|