[FFmpeg-devel] [PATCH] lavfi: add drawgraph filter
Paul B Mahol
onemda at gmail.com
Sat Jun 27 22:52:30 CEST 2015
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/filters.texi | 76 ++++++++++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_drawgraph.c | 297 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 375 insertions(+)
create mode 100644 libavfilter/vf_drawgraph.c
diff --git a/doc/filters.texi b/doc/filters.texi
index d9f913f..a1f8805 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -3965,6 +3965,81 @@ drawbox=x=-t:y=0.5*(ih-iw/2.4)-t:w=iw+t*2:h=iw/2.4+t*2:t=2:c=red
@end example
@end itemize
+ at section drawgraph
+
+Draw a graph using input video metadata.
+
+It accepts the following parameters:
+
+ at table @option
+ at item metadata
+Set frame metadata key from which metadata values will be used to draw a graph.
+
+ at item min
+Set minimal value of metadata value.
+
+ at item max
+Set maximal value of metadata value.
+
+ at item background
+Set graph background color. Default is white.
+
+ at item foreground
+Set foreground color expression.
+
+The expressions can use the following variables:
+
+ at table @option
+ at item MIN
+Minimal value of metadata value.
+
+ at item MAX
+Maximal value of metadata value.
+
+ at item VAL
+Current metadata key value.
+ at end table
+
+ at item mode
+Set graph mode.
+
+Available values for mode is:
+ at table @samp
+ at item bar
+ at item dot
+ at item line
+ at end table
+
+Default is @code{bar}.
+
+ at item slide
+Set slide mode.
+
+Available values for slide is:
+ at table @samp
+ at item frame
+Draw new frame when right border is reached.
+
+ at item replace
+Replace old columns with new ones.
+
+ at item scroll
+Scroll from right to left.
+ at end table
+
+Default is @code{frame}.
+
+ at item size
+Set size of graph video. For the syntax of this option, check the
+ at ref{video size syntax,,"Video size" section in the ffmpeg-utils manual,ffmpeg-utils}.
+The default value is @code{400x400}.
+ at end table
+
+Example using metadata from @ref{signalstats} filter:
+ at example
+signalstats,drawgraph=lavfi.signalstats.YAVG:min=0:max=255
+ at end example
+
@section drawgrid
Draw a grid on the input image.
@@ -8604,6 +8679,7 @@ Swap the second and third planes of the input:
ffmpeg -i INPUT -vf shuffleplanes=0:2:1:3 OUTPUT
@end example
+ at anchor{signalstats}
@section signalstats
Evaluate various visual metrics that assist in determining issues associated
with the digitization of analog video media.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 55cd055..54a8bbb 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -117,6 +117,7 @@ OBJS-$(CONFIG_DELOGO_FILTER) += vf_delogo.o
OBJS-$(CONFIG_DESHAKE_FILTER) += vf_deshake.o
OBJS-$(CONFIG_DETELECINE_FILTER) += vf_detelecine.o
OBJS-$(CONFIG_DRAWBOX_FILTER) += vf_drawbox.o
+OBJS-$(CONFIG_DRAWGRAPH_FILTER) += vf_drawgraph.o
OBJS-$(CONFIG_DRAWGRID_FILTER) += vf_drawbox.o
OBJS-$(CONFIG_DRAWTEXT_FILTER) += vf_drawtext.o
OBJS-$(CONFIG_ELBG_FILTER) += vf_elbg.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 3898498..b9508f5 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -133,6 +133,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(DESHAKE, deshake, vf);
REGISTER_FILTER(DETELECINE, detelecine, vf);
REGISTER_FILTER(DRAWBOX, drawbox, vf);
+ REGISTER_FILTER(DRAWGRAPH, drawgraph, vf);
REGISTER_FILTER(DRAWGRID, drawgrid, vf);
REGISTER_FILTER(DRAWTEXT, drawtext, vf);
REGISTER_FILTER(EDGEDETECT, edgedetect, vf);
diff --git a/libavfilter/vf_drawgraph.c b/libavfilter/vf_drawgraph.c
new file mode 100644
index 0000000..642453a
--- /dev/null
+++ b/libavfilter/vf_drawgraph.c
@@ -0,0 +1,297 @@
+/*
+ * Copyright (c) 2015 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 "float.h"
+
+#include "libavutil/eval.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct DrawGraphContext {
+ const AVClass *class;
+
+ char *key;
+ float min;
+ float max;
+ char *fg_str;
+ AVExpr *fg_expr;
+ uint8_t bg[4], fg[4];
+ int mode;
+ int slide;
+ int w, h;
+
+ AVFrame *out;
+ int x;
+ int prev_y;
+ int first;
+} DrawGraphContext;
+
+#define OFFSET(x) offsetof(DrawGraphContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption drawgraph_options[] = {
+ { "metadata", "set metadata key", OFFSET(key), AV_OPT_TYPE_STRING, {.str=""}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "min", "set minimal value", OFFSET(min), AV_OPT_TYPE_FLOAT, {.dbl=-1.}, INT_MIN, INT_MAX, FLAGS },
+ { "max", "set maximal value", OFFSET(max), AV_OPT_TYPE_FLOAT, {.dbl=1.}, INT_MIN, INT_MAX, FLAGS },
+ { "background", "set background color", OFFSET(bg), AV_OPT_TYPE_COLOR, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "bg", "set background color expression", OFFSET(bg), AV_OPT_TYPE_COLOR, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "foreground", "set foreground color expression", OFFSET(fg_str), AV_OPT_TYPE_STRING, {.str="0xff0000"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "fg", "set foreground color expression", OFFSET(fg_str), AV_OPT_TYPE_STRING, {.str="0xff0000"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "mode", "set graph mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, FLAGS, "mode" },
+ {"bar", "draw bars", OFFSET(mode), AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mode"},
+ {"dot", "draw dots", OFFSET(mode), AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mode"},
+ {"line", "draw lines", OFFSET(mode), AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "mode"},
+ { "slide", "set slide mode", OFFSET(slide), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, FLAGS, "slide" },
+ {"frame", "draw new frames", OFFSET(slide), AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "slide"},
+ {"replace", "replace old columns with new", OFFSET(slide), AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "slide"},
+ {"scroll", "scroll from right to left", OFFSET(slide), AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "slide"},
+ { "size", "set graph size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="400x400"}, 0, 0, FLAGS },
+ { "s", "set graph size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="400x400"}, 0, 0, FLAGS },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(drawgraph);
+
+static const char *const var_names[] = { "MAX", "MIN", "VAL", NULL };
+enum { VAR_MAX, VAR_MIN, VAR_VAL, VAR_VARS_NB };
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ DrawGraphContext *s = ctx->priv;
+ int ret;
+
+ if (s->max <= s->min) {
+ av_log(ctx, AV_LOG_ERROR, "max is same or lower than min\n");
+ return AVERROR(EINVAL);
+ }
+
+ if (s->fg_str) {
+ ret = av_expr_parse(&s->fg_expr, s->fg_str, var_names,
+ NULL, NULL, NULL, NULL, 0, ctx);
+
+ if (ret < 0)
+ return ret;
+ }
+
+ s->first = 1;
+
+ return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ AVFilterLink *outlink = ctx->outputs[0];
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_GBRP,
+ AV_PIX_FMT_NONE
+ };
+
+ AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
+ if (!fmts_list)
+ return AVERROR(ENOMEM);
+ ff_formats_ref(fmts_list, &outlink->in_formats);
+
+ return 0;
+}
+
+static void clear_image(DrawGraphContext *s, AVFrame *out, AVFilterLink *outlink)
+{
+ int i;
+
+ for (i = 0; i < out->height; i++) {
+ memset(out->data[0] + i * out->linesize[0], s->bg[1], outlink->w);
+ memset(out->data[1] + i * out->linesize[1], s->bg[2], outlink->w);
+ memset(out->data[2] + i * out->linesize[2], s->bg[0], outlink->w);
+ }
+}
+
+static inline void draw_dot(uint8_t fg[4], int x, int y, AVFrame *out)
+{
+ out->data[0][y * out->linesize[0] + x] = fg[1];
+ out->data[1][y * out->linesize[1] + x] = fg[2];
+ out->data[2][y * out->linesize[2] + x] = fg[0];
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+ AVFilterContext *ctx = inlink->dst;
+ DrawGraphContext *s = ctx->priv;
+ AVFilterLink *outlink = ctx->outputs[0];
+ AVDictionary *metadata;
+ AVDictionaryEntry *e;
+ AVFrame *out = s->out;
+ int j;
+ float vf;
+
+ if (!s->out || s->out->width != outlink->w ||
+ s->out->height != outlink->h) {
+ av_frame_free(&s->out);
+ s->out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ out = s->out;
+ if (!s->out) {
+ av_frame_free(&in);
+ return AVERROR(ENOMEM);
+ }
+
+ clear_image(s, out, outlink);
+ }
+ av_frame_copy_props(out, in);
+
+ metadata = av_frame_get_metadata(in);
+ e = av_dict_get(metadata, s->key, NULL, 0);
+
+ if (e && e->value) {
+ double values[VAR_VARS_NB];
+ int y, x, fg;
+
+ if (sscanf(e->value, "%f", &vf) != 1)
+ goto out;
+
+ vf = av_clipf(vf, s->min, s->max);
+
+ if (s->x >= outlink->w) {
+ if (s->slide == 0 || s->slide == 1)
+ s->x = 0;
+
+ if (s->slide == 2) {
+ s->x = outlink->w - 1;
+ for (j = 0; j < outlink->h; j++) {
+ memmove(out->data[0] + j * out->linesize[0],
+ out->data[0] + j * out->linesize[0] + 1,
+ outlink->w - 1);
+ memmove(out->data[1] + j * out->linesize[1],
+ out->data[1] + j * out->linesize[1] + 1,
+ outlink->w - 1);
+ memmove(out->data[2] + j * out->linesize[2],
+ out->data[2] + j * out->linesize[2] + 1,
+ outlink->w - 1);
+ }
+ } else if (s->slide == 0) {
+ clear_image(s, out, outlink);
+ }
+ }
+
+ x = s->x;
+ y = outlink->h * (1 - ((vf - s->min) / (s->max - s->min)));
+
+ values[VAR_MIN] = s->min;
+ values[VAR_MAX] = s->max;
+ values[VAR_VAL] = vf;
+
+ fg = av_expr_eval(s->fg_expr, values, NULL);
+
+ AV_WN32(s->fg, fg);
+
+ switch (s->mode) {
+ case 0:
+ if (s->slide == 1 || s->slide == 2)
+ for (j = 0; j < y; j++)
+ draw_dot(s->bg, x, j, out);
+ for (j = y; j < outlink->h; j++)
+ draw_dot(s->fg, x, j, out);
+ break;
+ case 1:
+ if (s->slide == 1 || s->slide == 2)
+ for (j = 0; j < outlink->h; j++)
+ draw_dot(s->bg, x, j, out);
+ draw_dot(s->fg, x, y, out);
+ break;
+ case 2:
+ if (s->first) {
+ s->first = 0;
+ s->prev_y = y;
+ }
+
+ if (s->slide == 1 || s->slide == 2) {
+ for (j = 0; j < y; j++)
+ draw_dot(s->bg, x, j, out);
+ for (j = outlink->h - 1; j > y; j--)
+ draw_dot(s->bg, x, j, out);
+ }
+ if (y <= s->prev_y) {
+ for (j = y; j <= s->prev_y; j++)
+ draw_dot(s->fg, x, j, out);
+ } else {
+ for (j = s->prev_y; j <= y; j++)
+ draw_dot(s->fg, x, j, out);
+ }
+ s->prev_y = y;
+ break;
+ }
+ s->x++;
+ }
+
+out:
+ av_frame_free(&in);
+ return ff_filter_frame(outlink, av_frame_clone(s->out));
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ DrawGraphContext *s = outlink->src->priv;
+
+ outlink->w = s->w;
+ outlink->h = s->h;
+ outlink->sample_aspect_ratio = (AVRational){1,1};
+
+ return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ DrawGraphContext *s = ctx->priv;
+
+ av_expr_free(s->fg_expr);
+ av_frame_free(&s->out);
+}
+
+static const AVFilterPad drawgraph_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad drawgraph_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_drawgraph = {
+ .name = "drawgraph",
+ .description = NULL_IF_CONFIG_SMALL("Draw a graph using input video metadata."),
+ .priv_size = sizeof(DrawGraphContext),
+ .priv_class = &drawgraph_class,
+ .query_formats = query_formats,
+ .init = init,
+ .uninit = uninit,
+ .inputs = drawgraph_inputs,
+ .outputs = drawgraph_outputs,
+};
--
1.7.11.2
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