/* * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at> * Copyright (c) 2011 Stefano Sabatini * Copyright (c) 2018 Danil Iashchenko * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/mem.h"#include "boxblur.h" static const char *const var_names[] = {    "w",    "h",    "cw",    "ch",    "hsub",    "vsub",    NULL}; enum var_name {    VAR_W,    VAR_H,    VAR_CW,    VAR_CH,    VAR_HSUB,    VAR_VSUB,    VARS_NB};  int ff_boxblur_eval_filter_params(AVFilterLink *inlink,                                  FilterParam *luma_param,                                  FilterParam *chroma_param,                                  FilterParam *alpha_param){    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);    AVFilterContext *ctx = inlink->dst;    int w = inlink->w, h = inlink->h;    int cw, ch;    double var_values[VARS_NB], res;    char *expr;    int ret;     if (!luma_param->radius_expr) {        av_log(ctx, AV_LOG_ERROR, "Luma radius expression is not set.\n");        return AVERROR(EINVAL);    }     /* fill missing params */    if (!chroma_param->radius_expr) {        chroma_param->radius_expr = av_strdup(luma_param->radius_expr);        if (!chroma_param->radius_expr)            return AVERROR(ENOMEM);    }    if (chroma_param->power < 0)        chroma_param->power = luma_param->power;     if (!alpha_param->radius_expr) {        alpha_param->radius_expr = av_strdup(luma_param->radius_expr);        if (!alpha_param->radius_expr)            return AVERROR(ENOMEM);    }    if (alpha_param->power < 0)        alpha_param->power = luma_param->power;     var_values[VAR_W]       = inlink->w;    var_values[VAR_H]       = inlink->h;    var_values[VAR_CW] = cw = w>>(desc->log2_chroma_w);    var_values[VAR_CH] = ch = h>>(desc->log2_chroma_h);    var_values[VAR_HSUB]    = 1<<(desc->log2_chroma_w);    var_values[VAR_VSUB]    = 1<<(desc->log2_chroma_h); #define EVAL_RADIUS_EXPR(comp)                                          \    expr = comp->radius_expr;                                           \    ret = av_expr_parse_and_eval(&res, expr, var_names, var_values,     \                                 NULL, NULL, NULL, NULL, NULL, 0, ctx); \    comp->radius = res;                                                 \    if (ret < 0) {                                                      \        av_log(ctx, AV_LOG_ERROR,                                      \               "Error when evaluating " #comp " radius expression '%s'\n", expr); \        return ret;                                                     \    }     EVAL_RADIUS_EXPR(luma_param);    EVAL_RADIUS_EXPR(chroma_param);    EVAL_RADIUS_EXPR(alpha_param);     av_log(ctx, AV_LOG_VERBOSE,           "luma_radius:%d luma_power:%d "           "chroma_radius:%d chroma_power:%d "           "alpha_radius:%d alpha_power:%d "           "w:%d chroma_w:%d h:%d chroma_h:%d\n",           luma_param  ->radius, luma_param  ->power,           chroma_param->radius, chroma_param->power,           alpha_param ->radius, alpha_param ->power,           w, cw, h, ch);  #define CHECK_RADIUS_VAL(w_, h_, comp)                                  \    if (comp->radius < 0 ||                                   \        2*comp->radius > FFMIN(w_, h_)) {                     \        av_log(ctx, AV_LOG_ERROR,                                       \               "Invalid " #comp " radius value %d, must be >= 0 and <= %d\n", \               comp->radius, FFMIN(w_, h_)/2);                \        return AVERROR(EINVAL);                                         \    }    CHECK_RADIUS_VAL(w,  h,  luma_param);    CHECK_RADIUS_VAL(cw, ch, chroma_param);    CHECK_RADIUS_VAL(w,  h,  alpha_param);     return 0;}