[FFmpeg-devel] [PATCH] Add 'drawgrid' video filter
Andrey Utkin
andrey.krieger.utkin at gmail.com
Mon May 13 14:13:43 CEST 2013
---
doc/filters.texi | 39 +++++++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_drawgrid.c | 206 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 247 insertions(+)
create mode 100644 libavfilter/vf_drawgrid.c
diff --git a/doc/filters.texi b/doc/filters.texi
index fe38b7f..2beb471 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -2877,6 +2877,45 @@ drawbox=x=10:y=10:w=100:h=100:color=pink@@0.5:t=max
@end example
@end itemize
+ at section drawgrid
+
+Draw a grid on the input image.
+
+This filter accepts the following options:
+
+ at table @option
+ at item x
+ at item y
+Specify the coordinates of some point of grid intersection (meant to configure offset). Both default to 0.
+
+ at item width, w
+ at item height, h
+Specify the width and height of the grid cell, if 0 they are interpreted as the
+input width and height, respectively, minus @code{thickness}, so image gets
+framed. Default to 0.
+
+ at item color, c
+Specify the color of the grid, it can be the name of a color
+(case insensitive match) or a 0xRRGGBB[AA] sequence. If the special
+value @code{invert} is used, the grid color is the same as the
+video with inverted luma.
+Note that you can append opacity value (in range of 0.0 - 1.0)
+to color name after @@ sign.
+
+ at item thickness, t
+Set the thickness of the grid line. Default value is @code{1}.
+ at end table
+
+ at subsection Examples
+
+ at itemize
+ at item
+Draw a grid with cell 100x100 pixels, thickness 2 pixels, with color red and an opacity of 50%:
+ at example
+drawgrid=width=100:height=100:thickness=2:color=red@@0.5
+ at end example
+ at end itemize
+
@anchor{drawtext}
@section drawtext
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index f0e703e..5d571ad 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -119,6 +119,7 @@ OBJS-$(CONFIG_DECIMATE_FILTER) += vf_decimate.o
OBJS-$(CONFIG_DELOGO_FILTER) += vf_delogo.o
OBJS-$(CONFIG_DESHAKE_FILTER) += vf_deshake.o
OBJS-$(CONFIG_DRAWBOX_FILTER) += vf_drawbox.o
+OBJS-$(CONFIG_DRAWGRID_FILTER) += vf_drawgrid.o
OBJS-$(CONFIG_DRAWTEXT_FILTER) += vf_drawtext.o
OBJS-$(CONFIG_EDGEDETECT_FILTER) += vf_edgedetect.o
OBJS-$(CONFIG_EXTRACTPLANES_FILTER) += vf_extractplanes.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index b8f273d..413dc54 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -117,6 +117,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(DELOGO, delogo, vf);
REGISTER_FILTER(DESHAKE, deshake, vf);
REGISTER_FILTER(DRAWBOX, drawbox, vf);
+ REGISTER_FILTER(DRAWGRID, drawgrid, vf);
REGISTER_FILTER(DRAWTEXT, drawtext, vf);
REGISTER_FILTER(EDGEDETECT, edgedetect, vf);
REGISTER_FILTER(EXTRACTPLANES, extractplanes, vf);
diff --git a/libavfilter/vf_drawgrid.c b/libavfilter/vf_drawgrid.c
new file mode 100644
index 0000000..a50a021
--- /dev/null
+++ b/libavfilter/vf_drawgrid.c
@@ -0,0 +1,206 @@
+/*
+ * Copyright (c) 2008 Affine Systems, Inc (Michael Sullivan, Bobby Impollonia)
+ * Copyright (c) 2013 Andrey Utkin <andrey.krieger.utkin gmail com>
+ *
+ * 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
+ * Grid drawing filter.
+ * Code derived from drawbox filter.
+ */
+
+#include "libavutil/colorspace.h"
+#include "libavutil/common.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/parseutils.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+enum { Y, U, V, A };
+
+typedef struct {
+ const AVClass *class;
+ int x, y, w, h, thickness;
+ char *color_str;
+ unsigned char yuv_color[4];
+ int invert_color; ///< invert luma color
+ int vsub, hsub; ///< chroma subsampling
+} DrawGridContext;
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ DrawGridContext *drawgrid = ctx->priv;
+ uint8_t rgba_color[4];
+
+ if (!strcmp(drawgrid->color_str, "invert"))
+ drawgrid->invert_color = 1;
+ else if (av_parse_color(rgba_color, drawgrid->color_str, -1, ctx) < 0)
+ return AVERROR(EINVAL);
+
+ if (!drawgrid->invert_color) {
+ drawgrid->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
+ drawgrid->yuv_color[U] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
+ drawgrid->yuv_color[V] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
+ drawgrid->yuv_color[A] = rgba_color[3];
+ }
+
+ return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
+ AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
+ AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
+ AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ440P,
+ AV_PIX_FMT_NONE
+ };
+
+ ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+ return 0;
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+ DrawGridContext *drawgrid = inlink->dst->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+
+ drawgrid->hsub = desc->log2_chroma_w;
+ drawgrid->vsub = desc->log2_chroma_h;
+
+ if (drawgrid->w == 0) drawgrid->w = inlink->w - drawgrid->thickness;
+ if (drawgrid->h == 0) drawgrid->h = inlink->h - drawgrid->thickness;
+
+ av_log(inlink->dst, AV_LOG_VERBOSE, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n",
+ drawgrid->x, drawgrid->y, drawgrid->w, drawgrid->h,
+ drawgrid->yuv_color[Y], drawgrid->yuv_color[U], drawgrid->yuv_color[V], drawgrid->yuv_color[A]);
+
+ return 0;
+}
+
+static av_pure av_always_inline int pixel_belongs_to_grid(DrawGridContext *drawgrid, int x, int y)
+{
+ // x is horizontal (width) coord,
+ // y is vertical (height) coord
+ int x_modulo;
+ int y_modulo;
+
+ // Abstract from the offset
+ x -= drawgrid->x;
+ y -= drawgrid->y;
+
+ x_modulo = x % drawgrid->w;
+ y_modulo = y % drawgrid->h;
+
+ // If x or y got negative, fix values to preserve logics
+ if (x_modulo < 0)
+ x_modulo += drawgrid->w;
+ if (y_modulo < 0)
+ y_modulo += drawgrid->h;
+
+ return x_modulo < drawgrid->thickness // Belongs to vertical line
+ || y_modulo < drawgrid->thickness; // Belongs to horizontal line
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
+{
+ DrawGridContext *drawgrid = inlink->dst->priv;
+ int plane, x, y;
+ uint8_t *row[4];
+
+ for (y = 0; y < frame->height; y++) {
+ row[0] = frame->data[0] + y * frame->linesize[0];
+
+ for (plane = 1; plane < 3; plane++)
+ row[plane] = frame->data[plane] +
+ frame->linesize[plane] * (y >> drawgrid->vsub);
+
+ if (drawgrid->invert_color) {
+ for (x = 0; x < frame->width; x++)
+ if (pixel_belongs_to_grid(drawgrid, x, y))
+ row[0][x] = 0xff - row[0][x];
+ } else {
+ for (x = 0; x < frame->width; x++) {
+ double alpha = (double)drawgrid->yuv_color[A] / 255;
+
+ if (pixel_belongs_to_grid(drawgrid, x, y)) {
+ row[0][x ] = (1 - alpha) * row[0][x ] + alpha * drawgrid->yuv_color[Y];
+ row[1][x >> drawgrid->hsub] = (1 - alpha) * row[1][x >> drawgrid->hsub] + alpha * drawgrid->yuv_color[U];
+ row[2][x >> drawgrid->hsub] = (1 - alpha) * row[2][x >> drawgrid->hsub] + alpha * drawgrid->yuv_color[V];
+ }
+ }
+ }
+ }
+
+ return ff_filter_frame(inlink->dst->outputs[0], frame);
+}
+
+#define OFFSET(x) offsetof(DrawGridContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption drawgrid_options[] = {
+ { "x", "set horizontal offset", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
+ { "y", "set vertical offset", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
+ { "width", "set width of grid cell", OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
+ { "w", "set width of grid cell", OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
+ { "height", "set height of grid cell", OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
+ { "h", "set height of grid cell", OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
+ { "color", "set color of the grid", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "c", "set color of the grid", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "thickness", "set grid line thickness", OFFSET(thickness), AV_OPT_TYPE_INT, {.i64=1}, 0, INT_MAX, FLAGS },
+ { "t", "set grid line thickness", OFFSET(thickness), AV_OPT_TYPE_INT, {.i64=1}, 0, INT_MAX, FLAGS },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(drawgrid);
+
+static const AVFilterPad avfilter_vf_drawgrid_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_input,
+ .filter_frame = filter_frame,
+ .needs_writable = 1,
+ },
+ { NULL }
+};
+
+static const AVFilterPad avfilter_vf_drawgrid_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ { NULL }
+};
+
+AVFilter avfilter_vf_drawgrid = {
+ .name = "drawgrid",
+ .description = NULL_IF_CONFIG_SMALL("Draw a colored grid on the input video."),
+ .priv_size = sizeof(DrawGridContext),
+ .priv_class = &drawgrid_class,
+ .init = init,
+ .query_formats = query_formats,
+ .inputs = avfilter_vf_drawgrid_inputs,
+ .outputs = avfilter_vf_drawgrid_outputs,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE,
+};
--
1.7.12.4
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