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457 lines
16 KiB
457 lines
16 KiB
/* |
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* Copyright (c) 2020 Paul B Mahol |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avfilter.h" |
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#include "filters.h" |
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#include "video.h" |
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#include "libavutil/imgutils.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/lfg.h" |
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#include "libavutil/random_seed.h" |
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#include <float.h> |
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#include <math.h> |
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typedef struct GradientsContext { |
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const AVClass *class; |
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int w, h; |
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int type; |
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AVRational frame_rate; |
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int64_t pts; |
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int64_t duration; ///< duration expressed in microseconds |
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float speed; |
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float angle; |
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uint8_t color_rgba[8][4]; |
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float color_rgbaf[8][4]; |
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int nb_colors; |
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int x0, y0, x1, y1; |
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float fx0, fy0, fx1, fy1; |
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int64_t seed; |
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AVLFG lfg; |
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int (*draw_slice)(AVFilterContext *ctx, void *arg, int job, int nb_jobs); |
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} GradientsContext; |
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#define OFFSET(x) offsetof(GradientsContext, x) |
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
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#define VFT AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM |
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static const AVOption gradients_options[] = { |
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{"size", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, 0, 0, FLAGS }, |
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{"s", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, 0, 0, FLAGS }, |
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{"rate", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS }, |
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{"r", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS }, |
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{"c0", "set 1st color", OFFSET(color_rgba[0]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS }, |
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{"c1", "set 2nd color", OFFSET(color_rgba[1]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS }, |
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{"c2", "set 3rd color", OFFSET(color_rgba[2]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS }, |
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{"c3", "set 4th color", OFFSET(color_rgba[3]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS }, |
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{"c4", "set 5th color", OFFSET(color_rgba[4]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS }, |
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{"c5", "set 6th color", OFFSET(color_rgba[5]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS }, |
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{"c6", "set 7th color", OFFSET(color_rgba[6]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS }, |
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{"c7", "set 8th color", OFFSET(color_rgba[7]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS }, |
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{"x0", "set gradient line source x0", OFFSET(x0), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS }, |
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{"y0", "set gradient line source y0", OFFSET(y0), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS }, |
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{"x1", "set gradient line destination x1", OFFSET(x1), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS }, |
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{"y1", "set gradient line destination y1", OFFSET(y1), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS }, |
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{"nb_colors", "set the number of colors", OFFSET(nb_colors), AV_OPT_TYPE_INT, {.i64=2}, 2, 8, FLAGS }, |
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{"n", "set the number of colors", OFFSET(nb_colors), AV_OPT_TYPE_INT, {.i64=2}, 2, 8, FLAGS }, |
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{"seed", "set the seed", OFFSET(seed), AV_OPT_TYPE_INT64, {.i64=-1}, -1, UINT32_MAX, FLAGS }, |
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{"duration", "set video duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS }, |
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{"d", "set video duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS }, |
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{"speed", "set gradients rotation speed", OFFSET(speed), AV_OPT_TYPE_FLOAT,{.dbl=0.01}, 0, 1, VFT }, |
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{"type", "set gradient type", OFFSET(type), AV_OPT_TYPE_INT, {.i64=0}, 0, 4, VFT, .unit = "type" }, |
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{"t", "set gradient type", OFFSET(type), AV_OPT_TYPE_INT, {.i64=0}, 0, 4, VFT, .unit = "type" }, |
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{ "linear", "set linear gradient", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, VFT, .unit = "type" }, |
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{ "radial", "set radial gradient", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, VFT, .unit = "type" }, |
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{ "circular", "set circular gradient", 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, VFT, .unit = "type" }, |
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{ "spiral", "set spiral gradient", 0, AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, VFT, .unit = "type" }, |
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{ "square", "set square gradient", 0, AV_OPT_TYPE_CONST, {.i64=4}, 0, 0, VFT, .unit = "type" }, |
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{NULL}, |
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}; |
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AVFILTER_DEFINE_CLASS(gradients); |
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static float lerpf(float a, float b, float x) |
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{ |
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const float y = 1.f - x; |
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return a * y + b * x; |
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} |
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static uint32_t lerp_color(uint8_t c0[4], uint8_t c1[4], float x) |
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{ |
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const float y = 1.f - x; |
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return (lrintf(c0[0] * y + c1[0] * x)) << 0 | |
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(lrintf(c0[1] * y + c1[1] * x)) << 8 | |
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(lrintf(c0[2] * y + c1[2] * x)) << 16 | |
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(lrintf(c0[3] * y + c1[3] * x)) << 24; |
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} |
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static uint64_t lerp_color16(uint8_t c0[4], uint8_t c1[4], float x) |
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{ |
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const float y = 1.f - x; |
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return ((uint64_t)llrintf((c0[0] * y + c1[0] * x) * 256)) << 0 | |
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((uint64_t)llrintf((c0[1] * y + c1[1] * x) * 256)) << 16 | |
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((uint64_t)llrintf((c0[2] * y + c1[2] * x) * 256)) << 32 | |
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((uint64_t)llrintf((c0[3] * y + c1[3] * x) * 256)) << 48; |
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} |
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static uint32_t lerp_colors(uint8_t arr[8][4], int nb_colors, int nb_wrap_colors, float step) |
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{ |
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float scl; |
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int i, j; |
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if (nb_colors == 1 || step <= 0.0) { |
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return arr[0][0] | (arr[0][1] << 8) | (arr[0][2] << 16) | (arr[0][3] << 24); |
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} else if (step >= 1.0) { |
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i = nb_colors - 1; |
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return arr[i][0] | (arr[i][1] << 8) | (arr[i][2] << 16) | (arr[i][3] << 24); |
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} |
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scl = step * (nb_wrap_colors - 1); |
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i = floorf(scl); |
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j = i + 1; |
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if (i >= nb_colors - 1) { |
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i = nb_colors - 1; |
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j = 0; |
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} |
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return lerp_color(arr[i], arr[j], scl - i); |
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} |
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static uint64_t lerp_colors16(uint8_t arr[8][4], int nb_colors, int nb_wrap_colors, float step) |
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{ |
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float scl; |
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int i, j; |
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if (nb_colors == 1 || step <= 0.0) { |
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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); |
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} else if (step >= 1.0) { |
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i = nb_colors - 1; |
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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); |
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} |
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scl = step * (nb_wrap_colors - 1); |
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i = floorf(scl); |
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j = i + 1; |
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if (i >= nb_colors - 1) { |
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i = nb_colors - 1; |
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j = 0; |
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} |
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return lerp_color16(arr[i], arr[j], scl - i); |
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} |
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static void lerp_colors32(float arr[8][4], int nb_colors, |
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int nb_wrap_colors, float step, |
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float *r, float *g, float *b, float *a) |
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{ |
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float scl, x; |
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int i, j; |
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if (nb_colors == 1 || step <= 0.0) { |
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*r = arr[0][0]; |
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*g = arr[0][1]; |
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*b = arr[0][2]; |
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*a = arr[0][3]; |
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return; |
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} else if (step >= 1.0) { |
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i = nb_colors - 1; |
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*r = arr[i][0]; |
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*g = arr[i][1]; |
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*b = arr[i][2]; |
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*a = arr[i][3]; |
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return; |
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} |
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scl = step * (nb_wrap_colors - 1); |
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i = floorf(scl); |
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j = i + 1; |
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if (i >= nb_colors - 1) { |
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i = nb_colors - 1; |
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j = 0; |
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} |
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x = scl - i; |
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*r = lerpf(arr[i][0], arr[j][0], x); |
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*g = lerpf(arr[i][1], arr[j][1], x); |
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*b = lerpf(arr[i][2], arr[j][2], x); |
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*a = lerpf(arr[i][3], arr[j][3], x); |
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} |
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static float project(float origin_x, float origin_y, |
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float dest_x, float dest_y, |
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float point_x, float point_y, int type) |
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{ |
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float op_x = point_x - origin_x; |
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float op_y = point_y - origin_y; |
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float od_x = dest_x - origin_x; |
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float od_y = dest_y - origin_y; |
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float op_x_od; |
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float od_s_q; |
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switch (type) { |
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case 0: |
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od_s_q = od_x * od_x + od_y * od_y; |
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break; |
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case 1: |
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od_s_q = sqrtf(od_x * od_x + od_y * od_y); |
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break; |
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case 2: |
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case 3: |
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od_s_q = M_PI * 2.f; |
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break; |
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case 4: |
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od_s_q = fmaxf(fabsf(od_x), fabsf(od_y)); |
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break; |
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} |
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switch (type) { |
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case 0: |
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op_x_od = op_x * od_x + op_y * od_y; |
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break; |
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case 1: |
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op_x_od = sqrtf(op_x * op_x + op_y * op_y); |
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break; |
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case 2: |
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op_x_od = atan2f(op_x, op_y) + M_PI; |
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break; |
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case 3: |
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op_x_od = fmodf(atan2f(op_x, op_y) + M_PI + point_x / fmaxf(origin_x, dest_x), 2.f * M_PI); |
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break; |
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case 4: |
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op_x_od = fmaxf(fabsf(op_x), fabsf(op_y)); |
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break; |
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} |
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// Normalize and clamp range. |
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return av_clipf(op_x_od / od_s_q, 0.f, 1.f); |
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} |
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static int draw_gradients_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs) |
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{ |
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GradientsContext *s = ctx->priv; |
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AVFrame *frame = arg; |
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const int width = frame->width; |
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const int height = frame->height; |
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const int start = (height * job ) / nb_jobs; |
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const int end = (height * (job+1)) / nb_jobs; |
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const ptrdiff_t linesize = frame->linesize[0] / 4; |
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uint32_t *dst = (uint32_t *)frame->data[0] + start * linesize; |
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const int type = s->type; |
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for (int y = start; y < end; y++) { |
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for (int x = 0; x < width; x++) { |
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float factor = project(s->fx0, s->fy0, s->fx1, s->fy1, x, y, type); |
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dst[x] = lerp_colors(s->color_rgba, s->nb_colors, s->nb_colors + (type >= 2 && type <= 3), factor); |
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} |
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dst += linesize; |
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} |
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return 0; |
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} |
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static int draw_gradients_slice16(AVFilterContext *ctx, void *arg, int job, int nb_jobs) |
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{ |
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GradientsContext *s = ctx->priv; |
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AVFrame *frame = arg; |
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const int width = frame->width; |
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const int height = frame->height; |
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const int start = (height * job ) / nb_jobs; |
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const int end = (height * (job+1)) / nb_jobs; |
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const ptrdiff_t linesize = frame->linesize[0] / 8; |
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uint64_t *dst = (uint64_t *)frame->data[0] + start * linesize; |
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const int type = s->type; |
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for (int y = start; y < end; y++) { |
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for (int x = 0; x < width; x++) { |
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float factor = project(s->fx0, s->fy0, s->fx1, s->fy1, x, y, type); |
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dst[x] = lerp_colors16(s->color_rgba, s->nb_colors, s->nb_colors + (type >= 2 && type <= 3), factor); |
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} |
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dst += linesize; |
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} |
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return 0; |
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} |
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static int draw_gradients_slice32_planar(AVFilterContext *ctx, void *arg, int job, int nb_jobs) |
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{ |
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GradientsContext *s = ctx->priv; |
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AVFrame *frame = arg; |
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const int width = frame->width; |
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const int height = frame->height; |
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const int start = (height * job ) / nb_jobs; |
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const int end = (height * (job+1)) / nb_jobs; |
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const ptrdiff_t linesize_g = frame->linesize[0] / 4; |
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const ptrdiff_t linesize_b = frame->linesize[1] / 4; |
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const ptrdiff_t linesize_r = frame->linesize[2] / 4; |
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const ptrdiff_t linesize_a = frame->linesize[3] / 4; |
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float *dst_g = (float *)frame->data[0] + start * linesize_g; |
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float *dst_b = (float *)frame->data[1] + start * linesize_b; |
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float *dst_r = (float *)frame->data[2] + start * linesize_r; |
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float *dst_a = (float *)frame->data[3] + start * linesize_a; |
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const int type = s->type; |
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for (int y = start; y < end; y++) { |
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for (int x = 0; x < width; x++) { |
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float factor = project(s->fx0, s->fy0, s->fx1, s->fy1, x, y, type); |
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lerp_colors32(s->color_rgbaf, s->nb_colors, s->nb_colors + (type >= 2 && type <= 3), factor, |
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&dst_r[x], &dst_g[x], &dst_b[x], &dst_a[x]); |
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} |
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dst_g += linesize_g; |
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dst_b += linesize_b; |
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dst_r += linesize_r; |
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dst_a += linesize_a; |
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} |
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return 0; |
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} |
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static int config_output(AVFilterLink *outlink) |
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{ |
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AVFilterContext *ctx = outlink->src; |
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FilterLink *l = ff_filter_link(outlink); |
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GradientsContext *s = ctx->priv; |
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format); |
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if (av_image_check_size(s->w, s->h, 0, ctx) < 0) |
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return AVERROR(EINVAL); |
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outlink->w = s->w; |
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outlink->h = s->h; |
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outlink->time_base = av_inv_q(s->frame_rate); |
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outlink->sample_aspect_ratio = (AVRational) {1, 1}; |
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l->frame_rate = s->frame_rate; |
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if (s->seed == -1) |
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s->seed = av_get_random_seed(); |
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av_lfg_init(&s->lfg, s->seed); |
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switch (desc->comp[0].depth) { |
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case 8: |
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s->draw_slice = draw_gradients_slice; |
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break; |
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case 16: |
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s->draw_slice = draw_gradients_slice16; |
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break; |
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case 32: |
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s->draw_slice = draw_gradients_slice32_planar; |
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break; |
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default: |
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return AVERROR_BUG; |
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} |
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if (s->x0 < 0 || s->x0 >= s->w) |
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s->x0 = av_lfg_get(&s->lfg) % s->w; |
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if (s->y0 < 0 || s->y0 >= s->h) |
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s->y0 = av_lfg_get(&s->lfg) % s->h; |
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if (s->x1 < 0 || s->x1 >= s->w) |
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s->x1 = av_lfg_get(&s->lfg) % s->w; |
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if (s->y1 < 0 || s->y1 >= s->h) |
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s->y1 = av_lfg_get(&s->lfg) % s->h; |
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for (int n = 0; n < 8; n++) { |
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for (int c = 0; c < 4; c++) |
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s->color_rgbaf[n][c] = s->color_rgba[n][c] / 255.f; |
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} |
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return 0; |
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} |
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static int activate(AVFilterContext *ctx) |
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{ |
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GradientsContext *s = ctx->priv; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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if (s->duration >= 0 && |
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av_rescale_q(s->pts, outlink->time_base, AV_TIME_BASE_Q) >= s->duration) { |
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ff_outlink_set_status(outlink, AVERROR_EOF, s->pts); |
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return 0; |
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} |
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if (ff_outlink_frame_wanted(outlink)) { |
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AVFrame *frame = ff_get_video_buffer(outlink, s->w, s->h); |
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float angle = fmodf(s->angle, 2.f * M_PI); |
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const float w2 = s->w / 2.f; |
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const float h2 = s->h / 2.f; |
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s->angle = angle + s->speed; |
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s->fx0 = (s->x0 - w2) * cosf(angle) - (s->y0 - h2) * sinf(angle) + w2; |
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s->fy0 = (s->x0 - w2) * sinf(angle) + (s->y0 - h2) * cosf(angle) + h2; |
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s->fx1 = (s->x1 - w2) * cosf(angle) - (s->y1 - h2) * sinf(angle) + w2; |
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s->fy1 = (s->x1 - w2) * sinf(angle) + (s->y1 - h2) * cosf(angle) + h2; |
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if (!frame) |
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return AVERROR(ENOMEM); |
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#if FF_API_FRAME_KEY |
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FF_DISABLE_DEPRECATION_WARNINGS |
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frame->key_frame = 1; |
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FF_ENABLE_DEPRECATION_WARNINGS |
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#endif |
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frame->flags |= AV_FRAME_FLAG_KEY; |
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#if FF_API_INTERLACED_FRAME |
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FF_DISABLE_DEPRECATION_WARNINGS |
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frame->interlaced_frame = 0; |
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FF_ENABLE_DEPRECATION_WARNINGS |
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#endif |
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frame->flags &= ~AV_FRAME_FLAG_INTERLACED; |
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frame->pict_type = AV_PICTURE_TYPE_I; |
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frame->sample_aspect_ratio = (AVRational) {1, 1}; |
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frame->pts = s->pts++; |
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frame->duration = 1; |
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ff_filter_execute(ctx, s->draw_slice, frame, NULL, |
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FFMIN(outlink->h, ff_filter_get_nb_threads(ctx))); |
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return ff_filter_frame(outlink, frame); |
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} |
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return FFERROR_NOT_READY; |
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} |
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static const AVFilterPad gradients_outputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.config_props = config_output, |
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}, |
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}; |
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const AVFilter ff_vsrc_gradients = { |
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.name = "gradients", |
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.description = NULL_IF_CONFIG_SMALL("Draw a gradients."), |
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.priv_size = sizeof(GradientsContext), |
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.priv_class = &gradients_class, |
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.inputs = NULL, |
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FILTER_OUTPUTS(gradients_outputs), |
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FILTER_PIXFMTS(AV_PIX_FMT_RGBA, AV_PIX_FMT_RGBA64, AV_PIX_FMT_GBRAPF32), |
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.activate = activate, |
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.flags = AVFILTER_FLAG_SLICE_THREADS, |
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.process_command = ff_filter_process_command, |
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};
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