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Diffstat (limited to 'libavfilter/vf_lut.c')
-rw-r--r-- | libavfilter/vf_lut.c | 371 |
1 files changed, 371 insertions, 0 deletions
diff --git a/libavfilter/vf_lut.c b/libavfilter/vf_lut.c new file mode 100644 index 0000000..d7fab5e --- /dev/null +++ b/libavfilter/vf_lut.c @@ -0,0 +1,371 @@ +/* + * Copyright (c) 2011 Stefano Sabatini + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; 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/mathematics.h" +#include "libavutil/opt.h" +#include "libavutil/pixdesc.h" +#include "avfilter.h" +#include "internal.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; +} 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_defaults(lut); + + 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_formats(ctx, avfilter_make_format_list(pix_fmts)); + 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) = { + clip, + 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; + min[A] = 0; max[A] = 255; + 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 (ff_fmt_is_in(inlink->format, yuv_pix_fmts)) lut->is_yuv = 1; + else if (ff_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, *inrow0, *outrow0; + int i, j, k, plane; + + if (lut->is_rgb) { + /* packed */ + inrow0 = inpic ->data[0] + y * inpic ->linesize[0]; + outrow0 = outpic->data[0] + y * outpic->linesize[0]; + + for (i = 0; i < h; i ++) { + inrow = inrow0; + outrow = outrow0; + 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; + } + inrow0 += inpic ->linesize[0]; + outrow0 += outpic->linesize[0]; + } + } else { + /* planar */ + for (plane = 0; plane < 4 && 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}}, \ + } + +#if CONFIG_LUT_FILTER +DEFINE_LUT_FILTER(lut, "Compute and apply a lookup table to the RGB/YUV input video.", init); +#endif +#if CONFIG_LUTYUV_FILTER +DEFINE_LUT_FILTER(lutyuv, "Compute and apply a lookup table to the YUV input video.", init); +#endif +#if CONFIG_LUTRGB_FILTER +DEFINE_LUT_FILTER(lutrgb, "Compute and apply a lookup table to the RGB input video.", init); +#endif |