383 lines
12 KiB
C
383 lines
12 KiB
C
/*
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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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/**
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* TODO:
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* - Add support to process_command
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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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int brightness = ((int) (100.0 * param->brightness + 100.0) * 511) / 200 - 128 - contrast / 32;
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for (y = 0; y < h; y++) {
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for (x = 0; x < w; x++) {
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pel = ((src[y * src_stride + x] * contrast) >> 12) + brightness;
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if (pel & ~255)
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pel = (-pel) >> 31;
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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)
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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->var_values[VAR_CONTRAST] = av_clipf(av_expr_eval(eq->contrast_pexpr, eq->var_values, eq),-2.0, 2.0);
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eq->param[0].contrast = eq->var_values[VAR_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->var_values[VAR_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->var_values[VAR_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->var_values[VAR_GAMMA] = av_clipf(av_expr_eval(eq->gamma_pexpr, eq->var_values, eq), 0.1, 10.0);
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eq->var_values[VAR_GAMMA_R] = av_clipf(av_expr_eval(eq->gamma_r_pexpr, eq->var_values, eq), 0.1, 10.0);
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eq->var_values[VAR_GAMMA_G] = av_clipf(av_expr_eval(eq->gamma_g_pexpr, eq->var_values, eq), 0.1, 10.0);
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eq->var_values[VAR_GAMMA_B] = av_clipf(av_expr_eval(eq->gamma_b_pexpr, eq->var_values, eq), 0.1, 10.0);
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eq->var_values[VAR_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->var_values[VAR_GAMMA] * eq->var_values[VAR_GAMMA_G];
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eq->param[1].gamma = sqrt(eq->var_values[VAR_GAMMA_B] / eq->var_values[VAR_GAMMA_G]);
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eq->param[2].gamma = sqrt(eq->var_values[VAR_GAMMA_R] / eq->var_values[VAR_GAMMA_G]);
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for (i = 0; i < 3; i++) {
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eq->param[i].gamma_weight = eq->var_values[VAR_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->var_values[VAR_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->var_values[VAR_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,
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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 evaluating 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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static int initialize(AVFilterContext *ctx)
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{
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EQContext *eq = ctx->priv;
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int ret;
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eq->process = process_c;
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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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if (ARCH_X86)
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ff_eq_init_x86(eq);
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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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return 0;
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}
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static 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 query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pixel_fmts_eq[] = {
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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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};
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ff_set_common_formats(ctx, ff_make_format_list(pixel_fmts_eq));
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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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AVFilterLink *outlink = inlink->dst->outputs[0];
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EQContext *eq = ctx->priv;
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AVFrame *out;
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const AVPixFmtDescriptor *desc;
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int i;
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out = ff_get_video_buffer(outlink, inlink->w, inlink->h);
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if (!out)
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return AVERROR(ENOMEM);
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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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for (i = 0; i < desc->nb_components; i++) {
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int w = inlink->w;
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int h = inlink->h;
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if (i == 1 || i == 2) {
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w = FF_CEIL_RSHIFT(w, desc->log2_chroma_w);
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h = FF_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);
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return ff_filter_frame(outlink, out);
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}
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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)
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{
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EQContext *eq = ctx->priv;
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int ret;
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if (!strcmp(cmd, "contrast")) {
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ret = set_expr(&eq->contrast_pexpr, args, cmd, ctx);
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set_contrast(eq);
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return ret;
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}
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else if (!strcmp(cmd, "brightness")) {
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ret = set_expr(&eq->brightness_pexpr, args, cmd, ctx);
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set_brightness(eq);
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return ret;
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}
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else if (!strcmp(cmd, "saturation")) {
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ret = set_expr(&eq->saturation_pexpr, args, cmd, ctx);
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set_saturation(eq);
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return ret;
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}
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else if (!strcmp(cmd, "gamma")) {
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ret = set_expr(&eq->gamma_pexpr, args, cmd, ctx);
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set_gamma(eq);
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return ret;
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}
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else if (!strcmp(cmd, "gamma_r")) {
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ret = set_expr(&eq->gamma_r_pexpr, args, cmd, ctx);
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set_gamma(eq);
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return ret;
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}
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else if (!strcmp(cmd, "gamma_g")) {
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ret = set_expr(&eq->gamma_g_pexpr, args, cmd, ctx);
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set_gamma(eq);
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return ret;
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}
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else if (!strcmp(cmd, "gamma_b")) {
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ret = set_expr(&eq->gamma_b_pexpr, args, cmd, ctx);
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set_gamma(eq);
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return ret;
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}
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else if (!strcmp(cmd, "gamma_weight")) {
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ret = set_expr(&eq->gamma_weight_pexpr, args, cmd, ctx);
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set_gamma(eq);
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return ret;
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}
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else
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return AVERROR(ENOSYS);
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}
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static const AVFilterPad eq_inputs[] = {
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{
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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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},
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{ NULL }
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};
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static const AVFilterPad eq_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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#define OFFSET(x) offsetof(EQContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption eq_options[] = {
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{ "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"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "brightness", "set the brightness adjustment",
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OFFSET(brightness_expr), AV_OPT_TYPE_STRING, {.str = "0.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "saturation", "set the saturation adjustment",
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OFFSET(saturation_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "gamma", "set the initial gamma value",
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OFFSET(gamma_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
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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"}, CHAR_MIN, CHAR_MAX, FLAGS },
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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"}, CHAR_MIN, CHAR_MAX, FLAGS },
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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"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "gamma_weight", "set the gamma weight which reduces the effect of gamma on bright areas",
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OFFSET(gamma_weight_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(eq);
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AVFilter ff_vf_eq = {
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.name = "eq",
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.description = NULL_IF_CONFIG_SMALL("Adjust brightness, contrast, gamma, and saturation."),
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.priv_size = sizeof(EQContext),
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.priv_class = &eq_class,
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.inputs = eq_inputs,
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.outputs = eq_outputs,
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.process_command = process_command,
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.query_formats = query_formats,
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.init = initialize,
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.uninit = uninit,
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};
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