| /* |
| * 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 "filters.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; |
| int64_t pts; |
| int64_t duration; ///< duration expressed in microseconds |
| float speed; |
| |
| 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 }, |
| {"duration", "set video duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },\ |
| {"d", "set video duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },\ |
| {"speed", "set gradients rotation speed", OFFSET(speed), AV_OPT_TYPE_FLOAT,{.dbl=0.01}, 0.00001, 1, 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 (lrintf(c0[0] * y + c1[0] * x)) << 0 | |
| (lrintf(c0[1] * y + c1[1] * x)) << 8 | |
| (lrintf(c0[2] * y + c1[2] * x)) << 16 | |
| (lrintf(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 (llrintf((c0[0] * y + c1[0] * x) * 256)) << 0 | |
| (llrintf((c0[1] * y + c1[1] * x) * 256)) << 16 | |
| (llrintf((c0[2] * y + c1[2] * x) * 256)) << 32 | |
| (llrintf((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 activate(AVFilterContext *ctx) |
| { |
| GradientsContext *s = ctx->priv; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| |
| if (s->duration >= 0 && |
| av_rescale_q(s->pts, outlink->time_base, AV_TIME_BASE_Q) >= s->duration) { |
| ff_outlink_set_status(outlink, AVERROR_EOF, s->pts); |
| return 0; |
| } |
| |
| if (ff_outlink_frame_wanted(outlink)) { |
| AVFrame *frame = ff_get_video_buffer(outlink, s->w, s->h); |
| float angle = fmodf(s->pts * s->speed, 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->key_frame = 1; |
| frame->interlaced_frame = 0; |
| frame->pict_type = AV_PICTURE_TYPE_I; |
| 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); |
| } |
| |
| return FFERROR_NOT_READY; |
| } |
| |
| static const AVFilterPad gradients_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .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, |
| .activate = activate, |
| .flags = AVFILTER_FLAG_SLICE_THREADS, |
| }; |
