GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/vf_eq.c Lines: 14 168 8.3 %
Date: 2020-08-13 15:06:06 Branches: 6 96 6.2 %

Line Branch Exec Source
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/*
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 * Original MPlayer filters by Richard Felker, Hampa Hug, Daniel Moreno,
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 * and Michael Niedermeyer.
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 *
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 * Copyright (c) 2014 James Darnley <james.darnley@gmail.com>
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 * Copyright (c) 2015 Arwa Arif <arwaarif1994@gmail.com>
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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 modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (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
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License along
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 * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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 * 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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 * very simple video equalizer
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 */
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#include "libavfilter/internal.h"
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#include "libavutil/common.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "vf_eq.h"
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static void create_lut(EQParameters *param)
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{
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    int i;
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    double   g  = 1.0 / param->gamma;
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    double   lw = 1.0 - param->gamma_weight;
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    for (i = 0; i < 256; i++) {
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        double v = i / 255.0;
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        v = param->contrast * (v - 0.5) + 0.5 + param->brightness;
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        if (v <= 0.0) {
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            param->lut[i] = 0;
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        } else {
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            v = v * lw + pow(v, g) * param->gamma_weight;
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            if (v >= 1.0)
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                param->lut[i] = 255;
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            else
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                param->lut[i] = 256.0 * v;
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        }
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    }
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    param->lut_clean = 1;
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}
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static void apply_lut(EQParameters *param, uint8_t *dst, int dst_stride,
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                      const uint8_t *src, int src_stride, int w, int h)
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{
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    int x, y;
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    if (!param->lut_clean)
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        create_lut(param);
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    for (y = 0; y < h; y++) {
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        for (x = 0; x < w; x++) {
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            dst[y * dst_stride + x] = param->lut[src[y * src_stride + x]];
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        }
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    }
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}
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static void process_c(EQParameters *param, uint8_t *dst, int dst_stride,
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                      const uint8_t *src, int src_stride, int w, int h)
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{
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    int x, y, pel;
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    int contrast = (int) (param->contrast * 256 * 16);
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3
    int brightness = ((int) (100.0 * param->brightness + 100.0) * 511) / 200 - 128 - contrast / 32;
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771
    for (y = 0; y < h; y++) {
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197376
        for (x = 0; x < w; x++) {
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196608
            pel = ((src[y * src_stride + x] * contrast) >> 12) + brightness;
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196608
            if (pel & ~255)
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142688
                pel = (-pel) >> 31;
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196608
            dst[y * dst_stride + x] = pel;
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        }
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    }
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}
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static void check_values(EQParameters *param, EQContext *eq)
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{
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    if (param->contrast == 1.0 && param->brightness == 0.0 && param->gamma == 1.0)
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        param->adjust = NULL;
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    else if (param->gamma == 1.0 && fabs(param->contrast) < 7.9)
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        param->adjust = eq->process;
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    else
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        param->adjust = apply_lut;
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}
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static void set_contrast(EQContext *eq)
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{
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    eq->contrast = av_clipf(av_expr_eval(eq->contrast_pexpr, eq->var_values, eq), -1000.0, 1000.0);
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    eq->param[0].contrast = eq->contrast;
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    eq->param[0].lut_clean = 0;
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    check_values(&eq->param[0], eq);
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}
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static void set_brightness(EQContext *eq)
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{
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    eq->brightness = av_clipf(av_expr_eval(eq->brightness_pexpr, eq->var_values, eq), -1.0, 1.0);
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    eq->param[0].brightness = eq->brightness;
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    eq->param[0].lut_clean = 0;
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    check_values(&eq->param[0], eq);
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}
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static void set_gamma(EQContext *eq)
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{
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    int i;
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    eq->gamma        = av_clipf(av_expr_eval(eq->gamma_pexpr,        eq->var_values, eq), 0.1, 10.0);
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    eq->gamma_r      = av_clipf(av_expr_eval(eq->gamma_r_pexpr,      eq->var_values, eq), 0.1, 10.0);
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    eq->gamma_g      = av_clipf(av_expr_eval(eq->gamma_g_pexpr,      eq->var_values, eq), 0.1, 10.0);
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    eq->gamma_b      = av_clipf(av_expr_eval(eq->gamma_b_pexpr,      eq->var_values, eq), 0.1, 10.0);
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    eq->gamma_weight = av_clipf(av_expr_eval(eq->gamma_weight_pexpr, eq->var_values, eq), 0.0,  1.0);
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    eq->param[0].gamma = eq->gamma * eq->gamma_g;
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    eq->param[1].gamma = sqrt(eq->gamma_b / eq->gamma_g);
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    eq->param[2].gamma = sqrt(eq->gamma_r / eq->gamma_g);
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    for (i = 0; i < 3; i++) {
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        eq->param[i].gamma_weight = eq->gamma_weight;
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        eq->param[i].lut_clean = 0;
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        check_values(&eq->param[i], eq);
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    }
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}
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static void set_saturation(EQContext *eq)
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{
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    int i;
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    eq->saturation = av_clipf(av_expr_eval(eq->saturation_pexpr, eq->var_values, eq), 0.0, 3.0);
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    for (i = 1; i < 3; i++) {
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        eq->param[i].contrast = eq->saturation;
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        eq->param[i].lut_clean = 0;
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        check_values(&eq->param[i], eq);
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    }
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}
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static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
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{
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    int ret;
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    AVExpr *old = NULL;
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    if (*pexpr)
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        old = *pexpr;
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    ret = av_expr_parse(pexpr, expr, var_names, NULL, NULL, NULL, NULL, 0, log_ctx);
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    if (ret < 0) {
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        av_log(log_ctx, AV_LOG_ERROR,
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               "Error when parsing the expression '%s' for %s\n",
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               expr, option);
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        *pexpr = old;
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        return ret;
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    }
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    av_expr_free(old);
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    return 0;
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}
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void ff_eq_init(EQContext *eq)
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{
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    eq->process = process_c;
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    if (ARCH_X86)
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        ff_eq_init_x86(eq);
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13
}
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static int initialize(AVFilterContext *ctx)
185
{
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    EQContext *eq = ctx->priv;
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    int ret;
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    ff_eq_init(eq);
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    if ((ret = set_expr(&eq->contrast_pexpr,     eq->contrast_expr,     "contrast",     ctx)) < 0 ||
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        (ret = set_expr(&eq->brightness_pexpr,   eq->brightness_expr,   "brightness",   ctx)) < 0 ||
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        (ret = set_expr(&eq->saturation_pexpr,   eq->saturation_expr,   "saturation",   ctx)) < 0 ||
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        (ret = set_expr(&eq->gamma_pexpr,        eq->gamma_expr,        "gamma",        ctx)) < 0 ||
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        (ret = set_expr(&eq->gamma_r_pexpr,      eq->gamma_r_expr,      "gamma_r",      ctx)) < 0 ||
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        (ret = set_expr(&eq->gamma_g_pexpr,      eq->gamma_g_expr,      "gamma_g",      ctx)) < 0 ||
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        (ret = set_expr(&eq->gamma_b_pexpr,      eq->gamma_b_expr,      "gamma_b",      ctx)) < 0 ||
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        (ret = set_expr(&eq->gamma_weight_pexpr, eq->gamma_weight_expr, "gamma_weight", ctx)) < 0 )
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        return ret;
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200
    if (eq->eval_mode == EVAL_MODE_INIT) {
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        set_gamma(eq);
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        set_contrast(eq);
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        set_brightness(eq);
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        set_saturation(eq);
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    }
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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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    EQContext *eq = ctx->priv;
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    av_expr_free(eq->contrast_pexpr);     eq->contrast_pexpr     = NULL;
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    av_expr_free(eq->brightness_pexpr);   eq->brightness_pexpr   = NULL;
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    av_expr_free(eq->saturation_pexpr);   eq->saturation_pexpr   = NULL;
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    av_expr_free(eq->gamma_pexpr);        eq->gamma_pexpr        = NULL;
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    av_expr_free(eq->gamma_weight_pexpr); eq->gamma_weight_pexpr = NULL;
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    av_expr_free(eq->gamma_r_pexpr);      eq->gamma_r_pexpr      = NULL;
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    av_expr_free(eq->gamma_g_pexpr);      eq->gamma_g_pexpr      = NULL;
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    av_expr_free(eq->gamma_b_pexpr);      eq->gamma_b_pexpr      = NULL;
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}
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static int config_props(AVFilterLink *inlink)
225
{
226
    EQContext *eq = inlink->dst->priv;
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    eq->var_values[VAR_N] = 0;
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    eq->var_values[VAR_R] = inlink->frame_rate.num == 0 || inlink->frame_rate.den == 0 ?
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        NAN : av_q2d(inlink->frame_rate);
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    return 0;
233
}
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static int query_formats(AVFilterContext *ctx)
236
{
237
    static const enum AVPixelFormat pixel_fmts_eq[] = {
238
        AV_PIX_FMT_GRAY8,
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        AV_PIX_FMT_YUV410P,
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        AV_PIX_FMT_YUV411P,
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        AV_PIX_FMT_YUV420P,
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        AV_PIX_FMT_YUV422P,
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        AV_PIX_FMT_YUV444P,
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        AV_PIX_FMT_NONE
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    };
246
    AVFilterFormats *fmts_list = ff_make_format_list(pixel_fmts_eq);
247
    if (!fmts_list)
248
        return AVERROR(ENOMEM);
249
    return ff_set_common_formats(ctx, fmts_list);
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
253
{
254
    AVFilterContext *ctx = inlink->dst;
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    AVFilterLink *outlink = inlink->dst->outputs[0];
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    EQContext *eq = ctx->priv;
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    AVFrame *out;
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    int64_t pos = in->pkt_pos;
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    const AVPixFmtDescriptor *desc;
260
    int i;
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    out = ff_get_video_buffer(outlink, inlink->w, inlink->h);
263
    if (!out) {
264
        av_frame_free(&in);
265
        return AVERROR(ENOMEM);
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    }
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    av_frame_copy_props(out, in);
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    desc = av_pix_fmt_desc_get(inlink->format);
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    eq->var_values[VAR_N]   = inlink->frame_count_out;
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    eq->var_values[VAR_POS] = pos == -1 ? NAN : pos;
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    eq->var_values[VAR_T]   = TS2T(in->pts, inlink->time_base);
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    if (eq->eval_mode == EVAL_MODE_FRAME) {
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        set_gamma(eq);
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        set_contrast(eq);
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        set_brightness(eq);
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        set_saturation(eq);
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    }
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    for (i = 0; i < desc->nb_components; i++) {
283
        int w = inlink->w;
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        int h = inlink->h;
285
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        if (i == 1 || i == 2) {
287
            w = AV_CEIL_RSHIFT(w, desc->log2_chroma_w);
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            h = AV_CEIL_RSHIFT(h, desc->log2_chroma_h);
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        }
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        if (eq->param[i].adjust)
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            eq->param[i].adjust(&eq->param[i], out->data[i], out->linesize[i],
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                                 in->data[i], in->linesize[i], w, h);
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        else
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            av_image_copy_plane(out->data[i], out->linesize[i],
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                                in->data[i], in->linesize[i], w, h);
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    }
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    av_frame_free(&in);
300
    return ff_filter_frame(outlink, out);
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}
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static inline int set_param(AVExpr **pexpr, const char *args, const char *cmd,
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                            void (*set_fn)(EQContext *eq), AVFilterContext *ctx)
305
{
306
    EQContext *eq = ctx->priv;
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    int ret;
308
    if ((ret = set_expr(pexpr, args, cmd, ctx)) < 0)
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        return ret;
310
    if (eq->eval_mode == EVAL_MODE_INIT)
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        set_fn(eq);
312
    return 0;
313
}
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static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
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                           char *res, int res_len, int flags)
317
{
318
    EQContext *eq = ctx->priv;
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#define SET_PARAM(param_name, set_fn_name)                              \
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    if (!strcmp(cmd, #param_name)) return set_param(&eq->param_name##_pexpr, args, cmd, set_##set_fn_name, ctx);
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         SET_PARAM(contrast, contrast)
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    else SET_PARAM(brightness, brightness)
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    else SET_PARAM(saturation, saturation)
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    else SET_PARAM(gamma, gamma)
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    else SET_PARAM(gamma_r, gamma)
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    else SET_PARAM(gamma_g, gamma)
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    else SET_PARAM(gamma_b, gamma)
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    else SET_PARAM(gamma_weight, gamma)
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    else return AVERROR(ENOSYS);
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}
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static const AVFilterPad eq_inputs[] = {
335
    {
336
        .name = "default",
337
        .type = AVMEDIA_TYPE_VIDEO,
338
        .filter_frame = filter_frame,
339
        .config_props = config_props,
340
    },
341
    { NULL }
342
};
343
344
static const AVFilterPad eq_outputs[] = {
345
    {
346
        .name = "default",
347
        .type = AVMEDIA_TYPE_VIDEO,
348
    },
349
    { NULL }
350
};
351
352
#define OFFSET(x) offsetof(EQContext, x)
353
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
354
#define TFLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
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static const AVOption eq_options[] = {
356
    { "contrast",     "set the contrast adjustment, negative values give a negative image",
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        OFFSET(contrast_expr),     AV_OPT_TYPE_STRING, {.str = "1.0"}, 0, 0, TFLAGS },
358
    { "brightness",   "set the brightness adjustment",
359
        OFFSET(brightness_expr),   AV_OPT_TYPE_STRING, {.str = "0.0"}, 0, 0, TFLAGS },
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    { "saturation",   "set the saturation adjustment",
361
        OFFSET(saturation_expr),   AV_OPT_TYPE_STRING, {.str = "1.0"}, 0, 0, TFLAGS },
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    { "gamma",        "set the initial gamma value",
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        OFFSET(gamma_expr),        AV_OPT_TYPE_STRING, {.str = "1.0"}, 0, 0, TFLAGS },
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    { "gamma_r",      "gamma value for red",
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        OFFSET(gamma_r_expr),      AV_OPT_TYPE_STRING, {.str = "1.0"}, 0, 0, TFLAGS },
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    { "gamma_g",      "gamma value for green",
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        OFFSET(gamma_g_expr),      AV_OPT_TYPE_STRING, {.str = "1.0"}, 0, 0, TFLAGS },
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    { "gamma_b",      "gamma value for blue",
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        OFFSET(gamma_b_expr),      AV_OPT_TYPE_STRING, {.str = "1.0"}, 0, 0, TFLAGS },
370
    { "gamma_weight", "set the gamma weight which reduces the effect of gamma on bright areas",
371
        OFFSET(gamma_weight_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, 0, 0, TFLAGS },
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    { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
373
         { "init",  "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT},  .flags = FLAGS, .unit = "eval" },
374
         { "frame", "eval expressions per-frame",                  0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
375
    { NULL }
376
};
377
378
AVFILTER_DEFINE_CLASS(eq);
379
380
AVFilter ff_vf_eq = {
381
    .name            = "eq",
382
    .description     = NULL_IF_CONFIG_SMALL("Adjust brightness, contrast, gamma, and saturation."),
383
    .priv_size       = sizeof(EQContext),
384
    .priv_class      = &eq_class,
385
    .inputs          = eq_inputs,
386
    .outputs         = eq_outputs,
387
    .process_command = process_command,
388
    .query_formats   = query_formats,
389
    .init            = initialize,
390
    .uninit          = uninit,
391
    .flags           = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
392
};