[FFmpeg-cvslog] avfilter: add gradients source video filter
Paul B Mahol
git at videolan.org
Tue May 19 21:12:53 EEST 2020
ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Fri May 15 13:06:34 2020 +0200| [f63939dedb898dd711860c530287ede55b6d88d7] | committer: Paul B Mahol
avfilter: add gradients source video filter
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f63939dedb898dd711860c530287ede55b6d88d7
---
Changelog | 1 +
doc/filters.texi | 27 ++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/version.h | 2 +-
libavfilter/vsrc_gradients.c | 290 +++++++++++++++++++++++++++++++++++++++++++
6 files changed, 321 insertions(+), 1 deletion(-)
diff --git a/Changelog b/Changelog
index c53d03dc01..69c5dacda7 100644
--- a/Changelog
+++ b/Changelog
@@ -68,6 +68,7 @@ version <next>:
- pcm_rechunk bitstream filter
- scdet filter
- NotchLC decoder
+- gradients source video filter
version 4.2:
diff --git a/doc/filters.texi b/doc/filters.texi
index f73d4057c1..53303f6867 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -22281,6 +22281,33 @@ need for a nullsrc video source.
@end itemize
+ at section gradients
+Generate several gradients.
+
+ at table @option
+ at item size, s
+Set frame size. For the syntax of this option, check the @ref{video size syntax,,"Video
+size" section in the ffmpeg-utils manual,ffmpeg-utils}. Default value is "640x480".
+
+ at item rate, r
+Set frame rate, expressed as number of frames per second. Default
+value is "25".
+
+ at item c0, c1, c2, c3, c4, c5, c6, c7
+Set 8 colors. Default values for colors is to pick random one.
+
+ at item x0, y0, y0, y1
+Set gradient line source and destination points. If negative or out of range, random ones
+are picked.
+
+ at item nb_colors, n
+Set number of colors to use at once. Allowed range is from 2 to 8. Default value is 2.
+
+ at item seed
+Set seed for picking gradient line points.
+ at end table
+
+
@section mandelbrot
Generate a Mandelbrot set fractal, and progressively zoom towards the
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index b2086f6fa9..4d07bb6948 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -471,6 +471,7 @@ OBJS-$(CONFIG_CELLAUTO_FILTER) += vsrc_cellauto.o
OBJS-$(CONFIG_COLOR_FILTER) += vsrc_testsrc.o
OBJS-$(CONFIG_COREIMAGESRC_FILTER) += vf_coreimage.o
OBJS-$(CONFIG_FREI0R_SRC_FILTER) += vf_frei0r.o
+OBJS-$(CONFIG_GRADIENTS_FILTER) += vsrc_gradients.o
OBJS-$(CONFIG_HALDCLUTSRC_FILTER) += vsrc_testsrc.o
OBJS-$(CONFIG_LIFE_FILTER) += vsrc_life.o
OBJS-$(CONFIG_MANDELBROT_FILTER) += vsrc_mandelbrot.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 8830c8d871..6d7ad68f38 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -449,6 +449,7 @@ extern AVFilter ff_vsrc_cellauto;
extern AVFilter ff_vsrc_color;
extern AVFilter ff_vsrc_coreimagesrc;
extern AVFilter ff_vsrc_frei0r_src;
+extern AVFilter ff_vsrc_gradients;
extern AVFilter ff_vsrc_haldclutsrc;
extern AVFilter ff_vsrc_life;
extern AVFilter ff_vsrc_mandelbrot;
diff --git a/libavfilter/version.h b/libavfilter/version.h
index 8bb22c380f..e2083200eb 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 7
-#define LIBAVFILTER_VERSION_MINOR 81
+#define LIBAVFILTER_VERSION_MINOR 82
#define LIBAVFILTER_VERSION_MICRO 100
diff --git a/libavfilter/vsrc_gradients.c b/libavfilter/vsrc_gradients.c
new file mode 100644
index 0000000000..984227017e
--- /dev/null
+++ b/libavfilter/vsrc_gradients.c
@@ -0,0 +1,290 @@
+/*
+ * Copyright (c) 2020 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 "avfilter.h"
+#include "formats.h"
+#include "video.h"
+#include "internal.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/lfg.h"
+#include "libavutil/random_seed.h"
+#include <float.h>
+#include <math.h>
+
+typedef struct GradientsContext {
+ const AVClass *class;
+ int w, h;
+ int type;
+ AVRational frame_rate;
+ uint64_t pts;
+
+ uint8_t color_rgba[8][4];
+ int nb_colors;
+ int x0, y0, x1, y1;
+ float fx0, fy0, fx1, fy1;
+
+ int64_t seed;
+
+ AVLFG lfg;
+ int (*draw_slice)(AVFilterContext *ctx, void *arg, int job, int nb_jobs);
+} GradientsContext;
+
+#define OFFSET(x) offsetof(GradientsContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption gradients_options[] = {
+ {"size", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, 0, 0, FLAGS },
+ {"s", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, 0, 0, FLAGS },
+ {"rate", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
+ {"r", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
+ {"c0", "set 1st color", OFFSET(color_rgba[0]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
+ {"c1", "set 2nd color", OFFSET(color_rgba[1]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
+ {"c2", "set 3rd color", OFFSET(color_rgba[2]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
+ {"c3", "set 4th color", OFFSET(color_rgba[3]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
+ {"c4", "set 5th color", OFFSET(color_rgba[4]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
+ {"c5", "set 6th color", OFFSET(color_rgba[5]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
+ {"c6", "set 7th color", OFFSET(color_rgba[6]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
+ {"c7", "set 8th color", OFFSET(color_rgba[7]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
+ {"x0", "set gradient line source x0", OFFSET(x0), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS },
+ {"y0", "set gradient line source y0", OFFSET(y0), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS },
+ {"x1", "set gradient line destination x1", OFFSET(x1), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS },
+ {"y1", "set gradient line destination y1", OFFSET(y1), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS },
+ {"nb_colors", "set the number of colors", OFFSET(nb_colors), AV_OPT_TYPE_INT, {.i64=2}, 2, 8, FLAGS },
+ {"n", "set the number of colors", OFFSET(nb_colors), AV_OPT_TYPE_INT, {.i64=2}, 2, 8, FLAGS },
+ {"seed", "set the seed", OFFSET(seed), AV_OPT_TYPE_INT64, {.i64=-1}, -1, UINT32_MAX, FLAGS },
+ {NULL},
+};
+
+AVFILTER_DEFINE_CLASS(gradients);
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_RGBA,
+ AV_PIX_FMT_RGBA64,
+ 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 uint32_t lerp_color(uint8_t c0[4], uint8_t c1[4], float x)
+{
+ const float y = 1.f - x;
+
+ return (lrint(c0[0] * y + c1[0] * x)) << 0 |
+ (lrint(c0[1] * y + c1[1] * x)) << 8 |
+ (lrint(c0[2] * y + c1[2] * x)) << 16 |
+ (lrint(c0[3] * y + c1[3] * x)) << 24;
+}
+
+static uint64_t lerp_color16(uint8_t c0[4], uint8_t c1[4], float x)
+{
+ const float y = 1.f - x;
+
+ return (llrint((c0[0] * y + c1[0] * x) * 256)) << 0 |
+ (llrint((c0[1] * y + c1[1] * x) * 256)) << 16 |
+ (llrint((c0[2] * y + c1[2] * x) * 256)) << 32 |
+ (llrint((c0[3] * y + c1[3] * x) * 256)) << 48;
+}
+
+static uint32_t lerp_colors(uint8_t arr[3][4], int nb_colors, float step)
+{
+ float scl;
+ int i;
+
+ if (nb_colors == 1 || step <= 0.0) {
+ return arr[0][0] | (arr[0][1] << 8) | (arr[0][2] << 16) | (arr[0][3] << 24);
+ } else if (step >= 1.0) {
+ i = nb_colors - 1;
+ return arr[i][0] | (arr[i][1] << 8) | (arr[i][2] << 16) | (arr[i][3] << 24);
+ }
+
+ scl = step * (nb_colors - 1);
+ i = floorf(scl);
+
+ return lerp_color(arr[i], arr[i + 1], scl - i);
+}
+
+static uint64_t lerp_colors16(uint8_t arr[3][4], int nb_colors, float step)
+{
+ float scl;
+ int i;
+
+ if (nb_colors == 1 || step <= 0.0) {
+ return ((uint64_t)arr[0][0] << 8) | ((uint64_t)arr[0][1] << 24) | ((uint64_t)arr[0][2] << 40) | ((uint64_t)arr[0][3] << 56);
+ } else if (step >= 1.0) {
+ i = nb_colors - 1;
+ return ((uint64_t)arr[i][0] << 8) | ((uint64_t)arr[i][1] << 24) | ((uint64_t)arr[i][2] << 40) | ((uint64_t)arr[i][3] << 56);
+ }
+
+ scl = step * (nb_colors - 1);
+ i = floorf(scl);
+
+ return lerp_color16(arr[i], arr[i + 1], scl - i);
+}
+
+static float project(float origin_x, float origin_y,
+ float dest_x, float dest_y,
+ int point_x, int point_y)
+{
+ // Rise and run of line.
+ float od_x = dest_x - origin_x;
+ float od_y = dest_y - origin_y;
+
+ // Distance-squared of line.
+ float od_s_q = od_x * od_x + od_y * od_y;
+
+ // Rise and run of projection.
+ float op_x = point_x - origin_x;
+ float op_y = point_y - origin_y;
+ float op_x_od = op_x * od_x + op_y * od_y;
+
+ // Normalize and clamp range.
+ return av_clipf(op_x_od / od_s_q, 0.f, 1.f);
+}
+
+static int draw_gradients_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
+{
+ GradientsContext *s = ctx->priv;
+ AVFrame *frame = arg;
+ const int width = frame->width;
+ const int height = frame->height;
+ const int start = (height * job ) / nb_jobs;
+ const int end = (height * (job+1)) / nb_jobs;
+ const int linesize = frame->linesize[0] / 4;
+ uint32_t *dst = (uint32_t *)frame->data[0] + start * linesize;
+
+ for (int y = start; y < end; y++) {
+ for (int x = 0; x < width; x++) {
+ float factor = project(s->fx0, s->fy0, s->fx1, s->fy1, x, y);
+ dst[x] = lerp_colors(s->color_rgba, s->nb_colors, factor);;
+ }
+
+ dst += linesize;
+ }
+
+ return 0;
+}
+
+static int draw_gradients_slice16(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
+{
+ GradientsContext *s = ctx->priv;
+ AVFrame *frame = arg;
+ const int width = frame->width;
+ const int height = frame->height;
+ const int start = (height * job ) / nb_jobs;
+ const int end = (height * (job+1)) / nb_jobs;
+ const int linesize = frame->linesize[0] / 8;
+ uint64_t *dst = (uint64_t *)frame->data[0] + start * linesize;
+
+ for (int y = start; y < end; y++) {
+ for (int x = 0; x < width; x++) {
+ float factor = project(s->fx0, s->fy0, s->fx1, s->fy1, x, y);
+ dst[x] = lerp_colors16(s->color_rgba, s->nb_colors, factor);;
+ }
+
+ dst += linesize;
+ }
+
+ return 0;
+}static int config_output(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->src;
+ GradientsContext *s = ctx->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+
+ if (av_image_check_size(s->w, s->h, 0, ctx) < 0)
+ return AVERROR(EINVAL);
+
+ inlink->w = s->w;
+ inlink->h = s->h;
+ inlink->time_base = av_inv_q(s->frame_rate);
+ inlink->sample_aspect_ratio = (AVRational) {1, 1};
+ if (s->seed == -1)
+ s->seed = av_get_random_seed();
+ av_lfg_init(&s->lfg, s->seed);
+
+ s->draw_slice = desc->comp[0].depth == 16 ? draw_gradients_slice16 : draw_gradients_slice;
+
+ if (s->x0 < 0 || s->x0 >= s->w)
+ s->x0 = av_lfg_get(&s->lfg) % s->w;
+ if (s->y0 < 0 || s->y0 >= s->h)
+ s->y0 = av_lfg_get(&s->lfg) % s->h;
+ if (s->x1 < 0 || s->x1 >= s->w)
+ s->x1 = av_lfg_get(&s->lfg) % s->w;
+ if (s->y1 < 0 || s->y1 >= s->h)
+ s->y1 = av_lfg_get(&s->lfg) % s->h;
+
+ return 0;
+}
+
+static int gradients_request_frame(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ GradientsContext *s = ctx->priv;
+ AVFrame *frame = ff_get_video_buffer(outlink, s->w, s->h);
+ float angle = fmodf(s->pts / 100.f, 2.f * M_PI);
+ const float w2 = s->w / 2.f;
+ const float h2 = s->h / 2.f;
+
+ s->fx0 = (s->x0 - w2) * cosf(angle) - (s->y0 - h2) * sinf(angle) + w2;
+ s->fy0 = (s->x0 - w2) * sinf(angle) + (s->y0 - h2) * cosf(angle) + h2;
+
+ s->fx1 = (s->x1 - w2) * cosf(angle) - (s->y1 - h2) * sinf(angle) + w2;
+ s->fy1 = (s->x1 - w2) * sinf(angle) + (s->y1 - h2) * cosf(angle) + h2;
+
+ if (!frame)
+ return AVERROR(ENOMEM);
+
+ frame->sample_aspect_ratio = (AVRational) {1, 1};
+ frame->pts = s->pts++;
+
+ ctx->internal->execute(ctx, s->draw_slice, frame, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
+
+ return ff_filter_frame(outlink, frame);
+}
+
+static const AVFilterPad gradients_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .request_frame = gradients_request_frame,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_vsrc_gradients = {
+ .name = "gradients",
+ .description = NULL_IF_CONFIG_SMALL("Draw a gradients."),
+ .priv_size = sizeof(GradientsContext),
+ .priv_class = &gradients_class,
+ .query_formats = query_formats,
+ .inputs = NULL,
+ .outputs = gradients_outputs,
+ .flags = AVFILTER_FLAG_SLICE_THREADS,
+};
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