[FFmpeg-devel] [RFC] [WIP] [PATCH] lavfi: add drawgraph filter
Paul B Mahol
onemda at gmail.com
Wed Jun 24 19:49:35 CEST 2015
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
Example:
ffplay movie.webm -vf signalstats,drawgraph=lavfi.signalstats.YAVG:min=0:max=255:mode=0
---
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_drawgraph.c | 186 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 188 insertions(+)
create mode 100644 libavfilter/vf_drawgraph.c
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..3c9eed8
--- /dev/null
+++ b/libavfilter/vf_drawgraph.c
@@ -0,0 +1,186 @@
+/*
+ * 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/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;
+ uint8_t bg[4];
+ uint8_t fg[4];
+ int mode;
+ int slide;
+
+ AVFrame *out;
+ int x;
+} 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 },
+ { "foreground", "set foreground color", OFFSET(fg), AV_OPT_TYPE_COLOR, {.str="blue"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "mode", "set graph mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
+ { "slide", "set slide mode", OFFSET(slide), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(drawgraph);
+
+static int query_formats(AVFilterContext *ctx)
+{
+ 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);
+ return ff_set_common_formats(ctx, fmts_list);
+}
+
+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 i, j;
+ float vf;
+ int vd;
+
+ 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);
+ }
+
+ 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);
+ }
+ }
+ s->out->pts = in->pts;
+
+ metadata = av_frame_get_metadata(in);
+ e = av_dict_get(metadata, s->key, NULL, 0);
+
+ if (e && e->value) {
+ if (sscanf(e->value, "%d", &vd) != 1)
+ goto out;
+ vf = vd;
+
+ if (vf >= s->min && vf <= s->max) {
+ int y, x;
+
+ if (s->x >= outlink->w) {
+ if (s->slide == 0 || s->slide == 1)
+ s->x = 0;
+
+ if (s->slide == 0) {
+ 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);
+ }
+ }
+ }
+
+ x = s->x;
+ y = outlink->h * (1 - (vf / (s->max - s->min)));
+
+ switch (s->mode) {
+ case 0:
+ for (j = y; j < outlink->h; j++) {
+ out->data[0][j * out->linesize[0] + x] = s->fg[1];
+ out->data[1][j * out->linesize[1] + x] = s->fg[2];
+ out->data[2][j * out->linesize[2] + x] = s->fg[0];
+ }
+ break;
+ case 1:
+ out->data[0][y * out->linesize[0] + x] = s->fg[1];
+ out->data[1][y * out->linesize[1] + x] = s->fg[2];
+ out->data[2][y * out->linesize[2] + x] = s->fg[0];
+ break;
+ }
+ s->x++;
+ }
+ }
+
+out:
+ av_frame_free(&in);
+ return ff_filter_frame(outlink, av_frame_clone(s->out));
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ DrawGraphContext *s = ctx->priv;
+
+ 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,
+ },
+ { 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,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = drawgraph_inputs,
+ .outputs = drawgraph_outputs,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+};
--
1.7.11.2
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