mirror of https://github.com/FFmpeg/FFmpeg.git
Stefano Sabatini
14 years ago
parent
83f9bc8aee
commit
dd2793c880
6 changed files with 488 additions and 1 deletions
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/*
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* Copyright (c) 2011 Stefano Sabatini |
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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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/**
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* @file |
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* Compute a look-up table for binding the input value to the output |
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* value, and apply it to input video. |
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*/ |
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#include "libavutil/eval.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/pixdesc.h" |
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#include "avfilter.h" |
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static const char *var_names[] = { |
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"E", |
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"PHI", |
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"PI", |
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"w", ///< width of the input video
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"h", ///< height of the input video
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"val", ///< input value for the pixel
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"maxval", ///< max value for the pixel
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"minval", ///< min value for the pixel
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"negval", ///< negated value
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"clipval", |
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NULL |
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}; |
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enum var_name { |
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VAR_E, |
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VAR_PHI, |
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VAR_PI, |
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VAR_W, |
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VAR_H, |
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VAR_VAL, |
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VAR_MAXVAL, |
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VAR_MINVAL, |
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VAR_NEGVAL, |
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VAR_CLIPVAL, |
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VAR_VARS_NB |
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}; |
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typedef struct { |
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const AVClass *class; |
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uint8_t lut[4][256]; ///< lookup table for each component
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char *comp_expr_str[4]; |
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AVExpr *comp_expr[4]; |
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int hsub, vsub; |
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double var_values[VAR_VARS_NB]; |
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int is_rgb, is_yuv; |
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int rgba_map[4]; |
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int step; |
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} LutContext; |
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#define Y 0 |
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#define U 1 |
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#define V 2 |
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#define R 0 |
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#define G 1 |
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#define B 2 |
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#define A 3 |
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#define OFFSET(x) offsetof(LutContext, x) |
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static const AVOption lut_options[] = { |
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{"c0", "set component #0 expression", OFFSET(comp_expr_str[0]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
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{"c1", "set component #1 expression", OFFSET(comp_expr_str[1]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
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{"c2", "set component #2 expression", OFFSET(comp_expr_str[2]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
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{"c3", "set component #3 expression", OFFSET(comp_expr_str[3]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
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{"y", "set Y expression", OFFSET(comp_expr_str[Y]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
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{"u", "set U expression", OFFSET(comp_expr_str[U]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
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{"v", "set V expression", OFFSET(comp_expr_str[V]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
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{"r", "set R expression", OFFSET(comp_expr_str[R]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
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{"g", "set G expression", OFFSET(comp_expr_str[G]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
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{"b", "set B expression", OFFSET(comp_expr_str[B]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
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{"a", "set A expression", OFFSET(comp_expr_str[A]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
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{NULL}, |
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}; |
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static const char *lut_get_name(void *ctx) |
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{ |
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return "lut"; |
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} |
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static const AVClass lut_class = { |
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"LutContext", |
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lut_get_name, |
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lut_options |
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}; |
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static int init(AVFilterContext *ctx, const char *args, void *opaque) |
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{ |
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LutContext *lut = ctx->priv; |
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int ret; |
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lut->class = &lut_class; |
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av_opt_set_defaults2(lut, 0, 0); |
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lut->var_values[VAR_PHI] = M_PHI; |
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lut->var_values[VAR_PI] = M_PI; |
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lut->var_values[VAR_E ] = M_E; |
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lut->is_rgb = !strcmp(ctx->filter->name, "lutrgb"); |
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lut->is_yuv = !strcmp(ctx->filter->name, "lutyuv"); |
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if (args && (ret = av_set_options_string(lut, args, "=", ":")) < 0) |
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return ret; |
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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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LutContext *lut = ctx->priv; |
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int i; |
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for (i = 0; i < 4; i++) { |
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av_expr_free(lut->comp_expr[i]); |
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lut->comp_expr[i] = NULL; |
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av_freep(&lut->comp_expr_str[i]); |
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} |
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} |
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#define YUV_FORMATS \ |
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PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P, \
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PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_YUV440P, \
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PIX_FMT_YUVA420P, \
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PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P, \
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PIX_FMT_YUVJ440P |
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#define RGB_FORMATS \ |
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PIX_FMT_ARGB, PIX_FMT_RGBA, \
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PIX_FMT_ABGR, PIX_FMT_BGRA, \
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PIX_FMT_RGB24, PIX_FMT_BGR24 |
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static enum PixelFormat yuv_pix_fmts[] = { YUV_FORMATS, PIX_FMT_NONE }; |
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static enum PixelFormat rgb_pix_fmts[] = { RGB_FORMATS, PIX_FMT_NONE }; |
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static enum PixelFormat all_pix_fmts[] = { RGB_FORMATS, YUV_FORMATS, PIX_FMT_NONE }; |
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static int query_formats(AVFilterContext *ctx) |
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{ |
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LutContext *lut = ctx->priv; |
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enum PixelFormat *pix_fmts = lut->is_rgb ? rgb_pix_fmts : |
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lut->is_yuv ? yuv_pix_fmts : all_pix_fmts; |
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avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts)); |
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return 0; |
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} |
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static int pix_fmt_is_in(enum PixelFormat pix_fmt, enum PixelFormat *pix_fmts) |
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{ |
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enum PixelFormat *p; |
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for (p = pix_fmts; *p != PIX_FMT_NONE; p++) { |
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if (pix_fmt == *p) |
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return 1; |
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} |
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return 0; |
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} |
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/**
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* Clip value val in the minval - maxval range. |
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*/ |
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static double clip(void *opaque, double val) |
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{ |
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LutContext *lut = opaque; |
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double minval = lut->var_values[VAR_MINVAL]; |
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double maxval = lut->var_values[VAR_MAXVAL]; |
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return av_clip(val, minval, maxval); |
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} |
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/**
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* Compute gamma correction for value val, assuming the minval-maxval |
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* range, val is clipped to a value contained in the same interval. |
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*/ |
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static double compute_gammaval(void *opaque, double gamma) |
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{ |
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LutContext *lut = opaque; |
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double val = lut->var_values[VAR_CLIPVAL]; |
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double minval = lut->var_values[VAR_MINVAL]; |
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double maxval = lut->var_values[VAR_MAXVAL]; |
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return pow((val-minval)/(maxval-minval), gamma) * (maxval-minval)+minval; |
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} |
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static double (* const funcs1[])(void *, double) = { |
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(void *)clip, |
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(void *)compute_gammaval, |
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NULL |
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}; |
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static const char * const funcs1_names[] = { |
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"clip", |
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"gammaval", |
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NULL |
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}; |
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static int config_props(AVFilterLink *inlink) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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LutContext *lut = ctx->priv; |
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const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[inlink->format]; |
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int min[4], max[4]; |
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int val, comp, ret; |
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lut->hsub = desc->log2_chroma_w; |
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lut->vsub = desc->log2_chroma_h; |
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lut->var_values[VAR_W] = inlink->w; |
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lut->var_values[VAR_H] = inlink->h; |
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switch (inlink->format) { |
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case PIX_FMT_YUV410P: |
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case PIX_FMT_YUV411P: |
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case PIX_FMT_YUV420P: |
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case PIX_FMT_YUV422P: |
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case PIX_FMT_YUV440P: |
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case PIX_FMT_YUV444P: |
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case PIX_FMT_YUVA420P: |
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min[Y] = min[U] = min[V] = 16; |
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max[Y] = 235; |
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max[U] = max[V] = 240; |
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break; |
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default: |
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min[0] = min[1] = min[2] = min[3] = 0; |
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max[0] = max[1] = max[2] = max[3] = 255; |
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} |
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lut->is_yuv = lut->is_rgb = 0; |
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if (pix_fmt_is_in(inlink->format, yuv_pix_fmts)) lut->is_yuv = 1; |
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else if (pix_fmt_is_in(inlink->format, rgb_pix_fmts)) lut->is_rgb = 1; |
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if (lut->is_rgb) { |
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switch (inlink->format) { |
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case PIX_FMT_ARGB: lut->rgba_map[A] = 0; lut->rgba_map[R] = 1; lut->rgba_map[G] = 2; lut->rgba_map[B] = 3; break; |
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case PIX_FMT_ABGR: lut->rgba_map[A] = 0; lut->rgba_map[B] = 1; lut->rgba_map[G] = 2; lut->rgba_map[R] = 3; break; |
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case PIX_FMT_RGBA: |
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case PIX_FMT_RGB24: lut->rgba_map[R] = 0; lut->rgba_map[G] = 1; lut->rgba_map[B] = 2; lut->rgba_map[A] = 3; break; |
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case PIX_FMT_BGRA: |
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case PIX_FMT_BGR24: lut->rgba_map[B] = 0; lut->rgba_map[G] = 1; lut->rgba_map[R] = 2; lut->rgba_map[A] = 3; break; |
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} |
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lut->step = av_get_bits_per_pixel(desc) >> 3; |
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} |
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for (comp = 0; comp < desc->nb_components; comp++) { |
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double res; |
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/* create the parsed expression */ |
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ret = av_expr_parse(&lut->comp_expr[comp], lut->comp_expr_str[comp], |
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var_names, funcs1_names, funcs1, NULL, NULL, 0, ctx); |
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if (ret < 0) { |
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av_log(ctx, AV_LOG_ERROR, |
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"Error when parsing the expression '%s' for the component %d.\n", |
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lut->comp_expr_str[comp], comp); |
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return AVERROR(EINVAL); |
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} |
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/* compute the lut */ |
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lut->var_values[VAR_MAXVAL] = max[comp]; |
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lut->var_values[VAR_MINVAL] = min[comp]; |
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for (val = 0; val < 256; val++) { |
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lut->var_values[VAR_VAL] = val; |
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lut->var_values[VAR_CLIPVAL] = av_clip(val, min[comp], max[comp]); |
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lut->var_values[VAR_NEGVAL] = |
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av_clip(min[comp] + max[comp] - lut->var_values[VAR_VAL], |
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min[comp], max[comp]); |
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res = av_expr_eval(lut->comp_expr[comp], lut->var_values, lut); |
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if (isnan(res)) { |
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av_log(ctx, AV_LOG_ERROR, |
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"Error when evaluating the expression '%s' for the value %d for the component #%d.\n", |
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lut->comp_expr_str[comp], val, comp); |
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return AVERROR(EINVAL); |
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} |
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lut->lut[comp][val] = av_clip((int)res, min[comp], max[comp]); |
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av_log(ctx, AV_LOG_DEBUG, "val[%d][%d] = %d\n", comp, val, lut->lut[comp][val]); |
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} |
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} |
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return 0; |
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} |
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static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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LutContext *lut = ctx->priv; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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AVFilterBufferRef *inpic = inlink ->cur_buf; |
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AVFilterBufferRef *outpic = outlink->out_buf; |
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uint8_t *inrow, *outrow; |
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int i, j, k, plane; |
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if (lut->is_rgb) { |
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/* packed */ |
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inrow = inpic ->data[0] + y * inpic ->linesize[0]; |
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outrow = outpic->data[0] + y * outpic->linesize[0]; |
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for (i = 0; i < h; i ++) { |
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for (j = 0; j < inlink->w; j++) { |
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for (k = 0; k < lut->step; k++) |
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outrow[k] = lut->lut[lut->rgba_map[k]][inrow[k]]; |
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outrow += lut->step; |
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inrow += lut->step; |
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} |
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} |
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} else { |
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/* planar */ |
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for (plane = 0; inpic->data[plane]; plane++) { |
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int vsub = plane == 1 || plane == 2 ? lut->vsub : 0; |
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int hsub = plane == 1 || plane == 2 ? lut->hsub : 0; |
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inrow = inpic ->data[plane] + (y>>vsub) * inpic ->linesize[plane]; |
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outrow = outpic->data[plane] + (y>>vsub) * outpic->linesize[plane]; |
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for (i = 0; i < h>>vsub; i ++) { |
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for (j = 0; j < inlink->w>>hsub; j++) |
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outrow[j] = lut->lut[plane][inrow[j]]; |
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inrow += inpic ->linesize[plane]; |
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outrow += outpic->linesize[plane]; |
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} |
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} |
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} |
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avfilter_draw_slice(outlink, y, h, slice_dir); |
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} |
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#define DEFINE_LUT_FILTER(name_, description_, init_) \ |
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AVFilter avfilter_vf_##name_ = { \
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.name = NULL_IF_CONFIG_SMALL(#name_), \
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.description = description_, \
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.priv_size = sizeof(LutContext), \
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\
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.init = init_, \
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.uninit = uninit, \
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.query_formats = query_formats, \
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\
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.inputs = (AVFilterPad[]) {{ .name = "default", \
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.type = AVMEDIA_TYPE_VIDEO, \
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.draw_slice = draw_slice, \
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.config_props = config_props, \
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.min_perms = AV_PERM_READ, }, \
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{ .name = NULL}}, \
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.outputs = (AVFilterPad[]) {{ .name = "default", \
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.type = AVMEDIA_TYPE_VIDEO, }, \
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{ .name = NULL}}, \
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} |
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DEFINE_LUT_FILTER(lut, "Compute and apply a lookup table to the RGB/YUV input video.", init); |
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DEFINE_LUT_FILTER(lutyuv, "Compute and apply a lookup table to the YUV input video.", init); |
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DEFINE_LUT_FILTER(lutrgb, "Compute and apply a lookup table to the RGB input video.", init); |
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