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https://github.com/FFmpeg/FFmpeg.git
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40e6575aa3
This is more spec-compliant because it does not rely on dead-code elimination by the compiler. Especially MSVC has problems with this, as can be seen in https://ffmpeg.org/pipermail/ffmpeg-devel/2022-May/296373.html or https://ffmpeg.org/pipermail/ffmpeg-devel/2022-May/297022.html This commit does not eliminate every instance where we rely on dead code elimination: It only tackles branching to the initialization of arch-specific dsp code, not e.g. all uses of CONFIG_ and HAVE_ checks. But maybe it is already enough to compile FFmpeg with MSVC with whole-programm-optimizations enabled (if one does not disable too many components). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
132 lines
3.3 KiB
C
132 lines
3.3 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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#ifndef AVFILTER_EQ_H
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#define AVFILTER_EQ_H
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#include "avfilter.h"
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#include "libavutil/eval.h"
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static const char *const var_names[] = {
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"n", // frame count
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"pos", // frame position
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"r", // frame rate
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"t", // timestamp expressed in seconds
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NULL
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};
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enum var_name {
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VAR_N,
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VAR_POS,
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VAR_R,
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VAR_T,
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VAR_NB
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};
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typedef struct EQParameters {
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void (*adjust)(struct EQParameters *eq, 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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uint8_t lut[256];
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double brightness, contrast, gamma, gamma_weight;
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int lut_clean;
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} EQParameters;
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typedef struct EQContext {
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const AVClass *class;
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EQParameters param[3];
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char *contrast_expr;
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AVExpr *contrast_pexpr;
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double contrast;
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char *brightness_expr;
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AVExpr *brightness_pexpr;
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double brightness;
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char *saturation_expr;
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AVExpr *saturation_pexpr;
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double saturation;
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char *gamma_expr;
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AVExpr *gamma_pexpr;
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double gamma;
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char *gamma_weight_expr;
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AVExpr *gamma_weight_pexpr;
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double gamma_weight;
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char *gamma_r_expr;
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AVExpr *gamma_r_pexpr;
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double gamma_r;
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char *gamma_g_expr;
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AVExpr *gamma_g_pexpr;
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double gamma_g;
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char *gamma_b_expr;
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AVExpr *gamma_b_pexpr;
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double gamma_b;
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double var_values[VAR_NB];
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void (*process)(struct EQParameters *par, 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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enum EvalMode { EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB } eval_mode;
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} EQContext;
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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 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 (int y = 0; y < h; y++) {
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for (int x = 0; x < w; x++) {
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int 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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void ff_eq_init_x86(EQContext *eq);
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static av_unused 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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#endif
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}
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#endif /* AVFILTER_EQ_H */
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