diff options
author | Paul B Mahol <onemda@gmail.com> | 2017-08-17 18:01:01 +0200 |
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committer | Paul B Mahol <onemda@gmail.com> | 2017-08-19 12:42:24 +0200 |
commit | e3a4afca07b2753269f5f05c6fd5ca3034734c00 (patch) | |
tree | 29f3ab29928f5405b06052b3d6b75e6efc5f6a90 /libavfilter/vf_pseudocolor.c | |
parent | 3c99523a2864af729a8576c3fffe81fb884fa0d5 (diff) |
avfilter: add pseudocolor filter
Diffstat (limited to 'libavfilter/vf_pseudocolor.c')
-rw-r--r-- | libavfilter/vf_pseudocolor.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/libavfilter/vf_pseudocolor.c b/libavfilter/vf_pseudocolor.c new file mode 100644 index 0000000000..642e2901e9 --- /dev/null +++ b/libavfilter/vf_pseudocolor.c @@ -0,0 +1,256 @@ +/* + * Copyright (c) 2017 Paul B Mahol + * + * 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 + */ + +#include "libavutil/attributes.h" +#include "libavutil/common.h" +#include "libavutil/eval.h" +#include "libavutil/imgutils.h" +#include "libavutil/opt.h" +#include "libavutil/pixdesc.h" +#include "avfilter.h" +#include "formats.h" +#include "internal.h" +#include "video.h" + +static const char *const var_names[] = { + "w", ///< width of the input video + "h", ///< height of the input video + "val", ///< input value for the pixel + "ymin", + "umin", + "vmin", + "amin", + "ymax", + "umax", + "vmax", + "amax", + NULL +}; + +enum var_name { + VAR_W, + VAR_H, + VAR_VAL, + VAR_YMIN, + VAR_UMIN, + VAR_VMIN, + VAR_AMIN, + VAR_YMAX, + VAR_UMAX, + VAR_VMAX, + VAR_AMAX, + VAR_VARS_NB +}; + +typedef struct PseudoColorContext { + const AVClass *class; + int max; + int index; + int nb_planes; + int color; + int linesize[4]; + int width[4], height[4]; + double var_values[VAR_VARS_NB]; + char *comp_expr_str[4]; + AVExpr *comp_expr[4]; + float lut[4][256]; +} PseudoColorContext; + +#define OFFSET(x) offsetof(PseudoColorContext, x) +#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM + +static const AVOption pseudocolor_options[] = { + { "c0", "set component #0 expression", OFFSET(comp_expr_str[0]), AV_OPT_TYPE_STRING, {.str="val"}, .flags = FLAGS }, + { "c1", "set component #1 expression", OFFSET(comp_expr_str[1]), AV_OPT_TYPE_STRING, {.str="val"}, .flags = FLAGS }, + { "c2", "set component #2 expression", OFFSET(comp_expr_str[2]), AV_OPT_TYPE_STRING, {.str="val"}, .flags = FLAGS }, + { "c3", "set component #3 expression", OFFSET(comp_expr_str[3]), AV_OPT_TYPE_STRING, {.str="val"}, .flags = FLAGS }, + { "i", "set component as base", OFFSET(index), AV_OPT_TYPE_INT, {.i64=0}, 0, 3, .flags = FLAGS }, + { NULL } +}; + +static const enum AVPixelFormat pix_fmts[] = { + AV_PIX_FMT_GRAY8, + AV_PIX_FMT_YUV444P, AV_PIX_FMT_GBRP, + AV_PIX_FMT_YUVA444P, AV_PIX_FMT_GBRAP, + AV_PIX_FMT_NONE +}; + +static int query_formats(AVFilterContext *ctx) +{ + AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts); + if (!fmts_list) + return AVERROR(ENOMEM); + return ff_set_common_formats(ctx, fmts_list); +} + +static int config_input(AVFilterLink *inlink) +{ + AVFilterContext *ctx = inlink->dst; + PseudoColorContext *s = ctx->priv; + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); + int depth, ret, hsub, vsub, color; + + depth = desc->comp[0].depth; + s->max = (1 << depth) - 1; + s->nb_planes = av_pix_fmt_count_planes(inlink->format); + + if (s->index >= s->nb_planes) { + av_log(ctx, AV_LOG_ERROR, "index out of allowed range\n"); + return AVERROR(EINVAL); + } + + if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0) + return ret; + + hsub = desc->log2_chroma_w; + vsub = desc->log2_chroma_h; + s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, vsub); + s->height[0] = s->height[3] = inlink->h; + s->width[1] = s->width[2] = AV_CEIL_RSHIFT(inlink->w, hsub); + s->width[0] = s->width[3] = inlink->w; + + s->var_values[VAR_W] = inlink->w; + s->var_values[VAR_H] = inlink->h; + + s->var_values[VAR_YMIN] = 16 * (1 << (depth - 8)); + s->var_values[VAR_UMIN] = 16 * (1 << (depth - 8)); + s->var_values[VAR_VMIN] = 16 * (1 << (depth - 8)); + s->var_values[VAR_AMIN] = 0; + s->var_values[VAR_YMAX] = 235 * (1 << (depth - 8)); + s->var_values[VAR_UMAX] = 240 * (1 << (depth - 8)); + s->var_values[VAR_VMAX] = 240 * (1 << (depth - 8)); + s->var_values[VAR_AMAX] = s->max; + + for (color = 0; color < s->nb_planes; color++) { + double res; + int val; + + /* create the parsed expression */ + av_expr_free(s->comp_expr[color]); + s->comp_expr[color] = NULL; + ret = av_expr_parse(&s->comp_expr[color], s->comp_expr_str[color], + var_names, NULL, NULL, NULL, NULL, 0, ctx); + if (ret < 0) { + av_log(ctx, AV_LOG_ERROR, + "Error when parsing the expression '%s' for the component %d and color %d.\n", + s->comp_expr_str[color], color, color); + return AVERROR(EINVAL); + } + + /* compute the lut */ + for (val = 0; val < FF_ARRAY_ELEMS(s->lut[color]); val++) { + s->var_values[VAR_VAL] = val; + + res = av_expr_eval(s->comp_expr[color], s->var_values, s); + if (isnan(res)) { + av_log(ctx, AV_LOG_ERROR, + "Error when evaluating the expression '%s' for the value %d for the component %d.\n", + s->comp_expr_str[color], val, color); + return AVERROR(EINVAL); + } + s->lut[color][val] = res; + } + } + + return 0; +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *in) +{ + AVFilterContext *ctx = inlink->dst; + PseudoColorContext *s = ctx->priv; + AVFilterLink *outlink = ctx->outputs[0]; + AVFrame *out; + int x, y, plane; + + out = ff_get_video_buffer(outlink, outlink->w, outlink->h); + if (!out) { + av_frame_free(&in); + return AVERROR(ENOMEM); + } + av_frame_copy_props(out, in); + + for (plane = 0; plane < s->nb_planes; plane++) { + const uint8_t *index = in->data[s->index]; + const uint8_t *src = in->data[plane]; + uint8_t *dst = out->data[plane]; + + for (y = 0; y < s->height[plane]; y++) { + for (x = 0; x < s->width[plane]; x++) { + int v = s->lut[plane][index[x]]; + + if (v >= 0 && v <= s->max) { + dst[x] = v; + } else { + dst[x] = src[x]; + } + } + index += in->linesize[s->index]; + src += in->linesize[plane]; + dst += out->linesize[plane]; + } + } + + av_frame_free(&in); + return ff_filter_frame(outlink, out); +} + +static const AVFilterPad inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .filter_frame = filter_frame, + .config_props = config_input, + }, + { NULL } +}; + +static const AVFilterPad outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + }, + { NULL } +}; + +static av_cold void uninit(AVFilterContext *ctx) +{ + PseudoColorContext *s = ctx->priv; + int i; + + for (i = 0; i < 4; i++) { + av_expr_free(s->comp_expr[i]); + s->comp_expr[i] = NULL; + } +} + +AVFILTER_DEFINE_CLASS(pseudocolor); + +AVFilter ff_vf_pseudocolor = { + .name = "pseudocolor", + .description = NULL_IF_CONFIG_SMALL("Make pseudocolored video frames."), + .priv_size = sizeof(PseudoColorContext), + .priv_class = &pseudocolor_class, + .uninit = uninit, + .query_formats = query_formats, + .inputs = inputs, + .outputs = outputs, + .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, +}; 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