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128 lines
4.4 KiB
C
128 lines
4.4 KiB
C
/*
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* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2011 Stefano Sabatini
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* Copyright (c) 2018 Danil Iashchenko
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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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#include "boxblur.h"
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static const char *const var_names[] = {
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"w",
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"h",
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"cw",
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"ch",
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"hsub",
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"vsub",
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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_CW,
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VAR_CH,
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VAR_HSUB,
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VAR_VSUB,
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VARS_NB
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};
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int ff_boxblur_eval_filter_params(AVFilterLink *inlink,
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FilterParam *luma_param,
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FilterParam *chroma_param,
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FilterParam *alpha_param)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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AVFilterContext *ctx = inlink->dst;
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int w = inlink->w, h = inlink->h;
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int cw, ch;
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double var_values[VARS_NB], res;
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char *expr;
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int ret;
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if (!luma_param->radius_expr) {
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av_log(ctx, AV_LOG_ERROR, "Luma radius expression is not set.\n");
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return AVERROR(EINVAL);
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}
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/* fill missing params */
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if (!chroma_param->radius_expr) {
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chroma_param->radius_expr = av_strdup(luma_param->radius_expr);
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if (!chroma_param->radius_expr)
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return AVERROR(ENOMEM);
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}
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if (chroma_param->power < 0)
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chroma_param->power = luma_param->power;
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if (!alpha_param->radius_expr) {
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alpha_param->radius_expr = av_strdup(luma_param->radius_expr);
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if (!alpha_param->radius_expr)
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return AVERROR(ENOMEM);
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}
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if (alpha_param->power < 0)
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alpha_param->power = luma_param->power;
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var_values[VAR_W] = inlink->w;
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var_values[VAR_H] = inlink->h;
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var_values[VAR_CW] = cw = w>>(desc->log2_chroma_w);
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var_values[VAR_CH] = ch = h>>(desc->log2_chroma_h);
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var_values[VAR_HSUB] = 1<<(desc->log2_chroma_w);
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var_values[VAR_VSUB] = 1<<(desc->log2_chroma_h);
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#define EVAL_RADIUS_EXPR(comp) \
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expr = comp->radius_expr; \
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ret = av_expr_parse_and_eval(&res, expr, var_names, var_values, \
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NULL, NULL, NULL, NULL, NULL, 0, ctx); \
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comp->radius = res; \
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if (ret < 0) { \
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av_log(NULL, AV_LOG_ERROR, \
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"Error when evaluating " #comp " radius expression '%s'\n", expr); \
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return ret; \
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}
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EVAL_RADIUS_EXPR(luma_param);
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EVAL_RADIUS_EXPR(chroma_param);
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EVAL_RADIUS_EXPR(alpha_param);
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av_log(ctx, AV_LOG_VERBOSE,
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"luma_radius:%d luma_power:%d "
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"chroma_radius:%d chroma_power:%d "
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"alpha_radius:%d alpha_power:%d "
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"w:%d chroma_w:%d h:%d chroma_h:%d\n",
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luma_param ->radius, luma_param ->power,
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chroma_param->radius, chroma_param->power,
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alpha_param ->radius, alpha_param ->power,
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w, cw, h, ch);
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#define CHECK_RADIUS_VAL(w_, h_, comp) \
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if (comp->radius < 0 || \
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2*comp->radius > FFMIN(w_, h_)) { \
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av_log(ctx, AV_LOG_ERROR, \
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"Invalid " #comp " radius value %d, must be >= 0 and <= %d\n", \
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comp->radius, FFMIN(w_, h_)/2); \
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return AVERROR(EINVAL); \
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}
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CHECK_RADIUS_VAL(w, h, luma_param);
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CHECK_RADIUS_VAL(cw, ch, chroma_param);
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CHECK_RADIUS_VAL(w, h, alpha_param);
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return 0;
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}
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