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FFmpeg4/libavfilter/vsrc_gradients.c

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/*
* 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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