| /* |
| * Copyright (c) 2011 Stefano Sabatini |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * Compute a look-up table for binding the input value to the output |
| * value, and apply it to input video. |
| */ |
| |
| #include "libavutil/eval.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/pixdesc.h" |
| #include "avfilter.h" |
| |
| static const char *var_names[] = { |
| "E", |
| "PHI", |
| "PI", |
| "w", ///< width of the input video |
| "h", ///< height of the input video |
| "val", ///< input value for the pixel |
| "maxval", ///< max value for the pixel |
| "minval", ///< min value for the pixel |
| "negval", ///< negated value |
| "clipval", |
| NULL |
| }; |
| |
| enum var_name { |
| VAR_E, |
| VAR_PHI, |
| VAR_PI, |
| VAR_W, |
| VAR_H, |
| VAR_VAL, |
| VAR_MAXVAL, |
| VAR_MINVAL, |
| VAR_NEGVAL, |
| VAR_CLIPVAL, |
| VAR_VARS_NB |
| }; |
| |
| typedef struct { |
| const AVClass *class; |
| uint8_t lut[4][256]; ///< lookup table for each component |
| char *comp_expr_str[4]; |
| AVExpr *comp_expr[4]; |
| int hsub, vsub; |
| double var_values[VAR_VARS_NB]; |
| int is_rgb, is_yuv; |
| int rgba_map[4]; |
| int step; |
| int negate_alpha; /* only used by negate */ |
| } LutContext; |
| |
| #define Y 0 |
| #define U 1 |
| #define V 2 |
| #define R 0 |
| #define G 1 |
| #define B 2 |
| #define A 3 |
| |
| #define OFFSET(x) offsetof(LutContext, x) |
| |
| static const AVOption lut_options[] = { |
| {"c0", "set component #0 expression", OFFSET(comp_expr_str[0]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
| {"c1", "set component #1 expression", OFFSET(comp_expr_str[1]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
| {"c2", "set component #2 expression", OFFSET(comp_expr_str[2]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
| {"c3", "set component #3 expression", OFFSET(comp_expr_str[3]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
| {"y", "set Y expression", OFFSET(comp_expr_str[Y]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
| {"u", "set U expression", OFFSET(comp_expr_str[U]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
| {"v", "set V expression", OFFSET(comp_expr_str[V]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
| {"r", "set R expression", OFFSET(comp_expr_str[R]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
| {"g", "set G expression", OFFSET(comp_expr_str[G]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
| {"b", "set B expression", OFFSET(comp_expr_str[B]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
| {"a", "set A expression", OFFSET(comp_expr_str[A]), FF_OPT_TYPE_STRING, {.str="val"}, CHAR_MIN, CHAR_MAX}, |
| {NULL}, |
| }; |
| |
| static const char *lut_get_name(void *ctx) |
| { |
| return "lut"; |
| } |
| |
| static const AVClass lut_class = { |
| "LutContext", |
| lut_get_name, |
| lut_options |
| }; |
| |
| static int init(AVFilterContext *ctx, const char *args, void *opaque) |
| { |
| LutContext *lut = ctx->priv; |
| int ret; |
| |
| lut->class = &lut_class; |
| av_opt_set_defaults2(lut, 0, 0); |
| |
| lut->var_values[VAR_PHI] = M_PHI; |
| lut->var_values[VAR_PI] = M_PI; |
| lut->var_values[VAR_E ] = M_E; |
| |
| lut->is_rgb = !strcmp(ctx->filter->name, "lutrgb"); |
| lut->is_yuv = !strcmp(ctx->filter->name, "lutyuv"); |
| if (args && (ret = av_set_options_string(lut, args, "=", ":")) < 0) |
| return ret; |
| |
| return 0; |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| LutContext *lut = ctx->priv; |
| int i; |
| |
| for (i = 0; i < 4; i++) { |
| av_expr_free(lut->comp_expr[i]); |
| lut->comp_expr[i] = NULL; |
| av_freep(&lut->comp_expr_str[i]); |
| } |
| } |
| |
| #define YUV_FORMATS \ |
| PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P, \ |
| PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_YUV440P, \ |
| PIX_FMT_YUVA420P, \ |
| PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P, \ |
| PIX_FMT_YUVJ440P |
| |
| #define RGB_FORMATS \ |
| PIX_FMT_ARGB, PIX_FMT_RGBA, \ |
| PIX_FMT_ABGR, PIX_FMT_BGRA, \ |
| PIX_FMT_RGB24, PIX_FMT_BGR24 |
| |
| static enum PixelFormat yuv_pix_fmts[] = { YUV_FORMATS, PIX_FMT_NONE }; |
| static enum PixelFormat rgb_pix_fmts[] = { RGB_FORMATS, PIX_FMT_NONE }; |
| static enum PixelFormat all_pix_fmts[] = { RGB_FORMATS, YUV_FORMATS, PIX_FMT_NONE }; |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| LutContext *lut = ctx->priv; |
| |
| enum PixelFormat *pix_fmts = lut->is_rgb ? rgb_pix_fmts : |
| lut->is_yuv ? yuv_pix_fmts : all_pix_fmts; |
| |
| avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts)); |
| return 0; |
| } |
| |
| static int pix_fmt_is_in(enum PixelFormat pix_fmt, enum PixelFormat *pix_fmts) |
| { |
| enum PixelFormat *p; |
| for (p = pix_fmts; *p != PIX_FMT_NONE; p++) { |
| if (pix_fmt == *p) |
| return 1; |
| } |
| return 0; |
| } |
| |
| /** |
| * Clip value val in the minval - maxval range. |
| */ |
| static double clip(void *opaque, double val) |
| { |
| LutContext *lut = opaque; |
| double minval = lut->var_values[VAR_MINVAL]; |
| double maxval = lut->var_values[VAR_MAXVAL]; |
| |
| return av_clip(val, minval, maxval); |
| } |
| |
| /** |
| * Compute gamma correction for value val, assuming the minval-maxval |
| * range, val is clipped to a value contained in the same interval. |
| */ |
| static double compute_gammaval(void *opaque, double gamma) |
| { |
| LutContext *lut = opaque; |
| double val = lut->var_values[VAR_CLIPVAL]; |
| double minval = lut->var_values[VAR_MINVAL]; |
| double maxval = lut->var_values[VAR_MAXVAL]; |
| |
| return pow((val-minval)/(maxval-minval), gamma) * (maxval-minval)+minval; |
| } |
| |
| static double (* const funcs1[])(void *, double) = { |
| (void *)clip, |
| (void *)compute_gammaval, |
| NULL |
| }; |
| |
| static const char * const funcs1_names[] = { |
| "clip", |
| "gammaval", |
| NULL |
| }; |
| |
| static int config_props(AVFilterLink *inlink) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| LutContext *lut = ctx->priv; |
| const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[inlink->format]; |
| int min[4], max[4]; |
| int val, comp, ret; |
| |
| lut->hsub = desc->log2_chroma_w; |
| lut->vsub = desc->log2_chroma_h; |
| |
| lut->var_values[VAR_W] = inlink->w; |
| lut->var_values[VAR_H] = inlink->h; |
| |
| switch (inlink->format) { |
| case PIX_FMT_YUV410P: |
| case PIX_FMT_YUV411P: |
| case PIX_FMT_YUV420P: |
| case PIX_FMT_YUV422P: |
| case PIX_FMT_YUV440P: |
| case PIX_FMT_YUV444P: |
| case PIX_FMT_YUVA420P: |
| min[Y] = min[U] = min[V] = 16; |
| max[Y] = 235; |
| max[U] = max[V] = 240; |
| break; |
| default: |
| min[0] = min[1] = min[2] = min[3] = 0; |
| max[0] = max[1] = max[2] = max[3] = 255; |
| } |
| |
| lut->is_yuv = lut->is_rgb = 0; |
| if (pix_fmt_is_in(inlink->format, yuv_pix_fmts)) lut->is_yuv = 1; |
| else if (pix_fmt_is_in(inlink->format, rgb_pix_fmts)) lut->is_rgb = 1; |
| |
| if (lut->is_rgb) { |
| switch (inlink->format) { |
| 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; |
| 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; |
| case PIX_FMT_RGBA: |
| 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; |
| case PIX_FMT_BGRA: |
| 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; |
| } |
| lut->step = av_get_bits_per_pixel(desc) >> 3; |
| } |
| |
| for (comp = 0; comp < desc->nb_components; comp++) { |
| double res; |
| |
| /* create the parsed expression */ |
| ret = av_expr_parse(&lut->comp_expr[comp], lut->comp_expr_str[comp], |
| var_names, funcs1_names, funcs1, NULL, NULL, 0, ctx); |
| if (ret < 0) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Error when parsing the expression '%s' for the component %d.\n", |
| lut->comp_expr_str[comp], comp); |
| return AVERROR(EINVAL); |
| } |
| |
| /* compute the lut */ |
| lut->var_values[VAR_MAXVAL] = max[comp]; |
| lut->var_values[VAR_MINVAL] = min[comp]; |
| |
| for (val = 0; val < 256; val++) { |
| lut->var_values[VAR_VAL] = val; |
| lut->var_values[VAR_CLIPVAL] = av_clip(val, min[comp], max[comp]); |
| lut->var_values[VAR_NEGVAL] = |
| av_clip(min[comp] + max[comp] - lut->var_values[VAR_VAL], |
| min[comp], max[comp]); |
| |
| res = av_expr_eval(lut->comp_expr[comp], lut->var_values, lut); |
| if (isnan(res)) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Error when evaluating the expression '%s' for the value %d for the component #%d.\n", |
| lut->comp_expr_str[comp], val, comp); |
| return AVERROR(EINVAL); |
| } |
| lut->lut[comp][val] = av_clip((int)res, min[comp], max[comp]); |
| av_log(ctx, AV_LOG_DEBUG, "val[%d][%d] = %d\n", comp, val, lut->lut[comp][val]); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| LutContext *lut = ctx->priv; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| AVFilterBufferRef *inpic = inlink ->cur_buf; |
| AVFilterBufferRef *outpic = outlink->out_buf; |
| uint8_t *inrow, *outrow; |
| int i, j, k, plane; |
| |
| if (lut->is_rgb) { |
| /* packed */ |
| inrow = inpic ->data[0] + y * inpic ->linesize[0]; |
| outrow = outpic->data[0] + y * outpic->linesize[0]; |
| |
| for (i = 0; i < h; i ++) { |
| for (j = 0; j < inlink->w; j++) { |
| for (k = 0; k < lut->step; k++) |
| outrow[k] = lut->lut[lut->rgba_map[k]][inrow[k]]; |
| outrow += lut->step; |
| inrow += lut->step; |
| } |
| } |
| } else { |
| /* planar */ |
| for (plane = 0; inpic->data[plane]; plane++) { |
| int vsub = plane == 1 || plane == 2 ? lut->vsub : 0; |
| int hsub = plane == 1 || plane == 2 ? lut->hsub : 0; |
| |
| inrow = inpic ->data[plane] + (y>>vsub) * inpic ->linesize[plane]; |
| outrow = outpic->data[plane] + (y>>vsub) * outpic->linesize[plane]; |
| |
| for (i = 0; i < h>>vsub; i ++) { |
| for (j = 0; j < inlink->w>>hsub; j++) |
| outrow[j] = lut->lut[plane][inrow[j]]; |
| inrow += inpic ->linesize[plane]; |
| outrow += outpic->linesize[plane]; |
| } |
| } |
| } |
| |
| avfilter_draw_slice(outlink, y, h, slice_dir); |
| } |
| |
| #define DEFINE_LUT_FILTER(name_, description_, init_) \ |
| AVFilter avfilter_vf_##name_ = { \ |
| .name = #name_, \ |
| .description = NULL_IF_CONFIG_SMALL(description_), \ |
| .priv_size = sizeof(LutContext), \ |
| \ |
| .init = init_, \ |
| .uninit = uninit, \ |
| .query_formats = query_formats, \ |
| \ |
| .inputs = (AVFilterPad[]) {{ .name = "default", \ |
| .type = AVMEDIA_TYPE_VIDEO, \ |
| .draw_slice = draw_slice, \ |
| .config_props = config_props, \ |
| .min_perms = AV_PERM_READ, }, \ |
| { .name = NULL}}, \ |
| .outputs = (AVFilterPad[]) {{ .name = "default", \ |
| .type = AVMEDIA_TYPE_VIDEO, }, \ |
| { .name = NULL}}, \ |
| } |
| |
| DEFINE_LUT_FILTER(lut, "Compute and apply a lookup table to the RGB/YUV input video.", init); |
| DEFINE_LUT_FILTER(lutyuv, "Compute and apply a lookup table to the YUV input video.", init); |
| DEFINE_LUT_FILTER(lutrgb, "Compute and apply a lookup table to the RGB input video.", init); |
| |
| #if CONFIG_NEGATE_FILTER |
| |
| static int negate_init(AVFilterContext *ctx, const char *args, void *opaque) |
| { |
| LutContext *lut = ctx->priv; |
| char lut_params[1024]; |
| |
| if (args) |
| sscanf(args, "%d", &lut->negate_alpha); |
| |
| av_log(ctx, AV_LOG_INFO, "negate_alpha:%d\n", lut->negate_alpha); |
| |
| snprintf(lut_params, sizeof(lut_params), "c0=negval:c1=negval:c2=negval:a=%s", |
| lut->negate_alpha ? "negval" : "val"); |
| |
| return init(ctx, lut_params, opaque); |
| } |
| |
| DEFINE_LUT_FILTER(negate, "Negate input video.", negate_init); |
| |
| #endif |
