From f63939dedb898dd711860c530287ede55b6d88d7 Mon Sep 17 00:00:00 2001 From: Paul B Mahol Date: Fri, 15 May 2020 13:06:34 +0200 Subject: avfilter: add gradients source video filter --- libavfilter/vsrc_gradients.c | 290 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 290 insertions(+) create mode 100644 libavfilter/vsrc_gradients.c (limited to 'libavfilter/vsrc_gradients.c') 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 +#include + +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, +}; -- cgit v1.2.3