libavfilter/vf_chromakey.c - manifest_repos/ffmpeg - Git at Google

 /*
  * Copyright (c) 2015 Timo Rothenpieler <timo@rothenpieler.org>
  *
  * 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 "libavutil/opt.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/intreadwrite.h"
 #include "avfilter.h"
 #include "formats.h"
 #include "internal.h"
 #include "video.h"

 typedef struct ChromakeyContext {
     const AVClass *class;

     uint8_t chromakey_rgba[4];
     uint16_t chromakey_uv[2];

     float similarity;
     float blend;

     int is_yuv;
     int depth;
     int mid;
     int max;

     int hsub_log2;
     int vsub_log2;

     int (*do_slice)(AVFilterContext *ctx, void *arg,
                     int jobnr, int nb_jobs);
 } ChromakeyContext;

 static uint8_t do_chromakey_pixel(ChromakeyContext *ctx, uint8_t u[9], uint8_t v[9])
 {
     double diff = 0.0;
     int du, dv, i;

     for (i = 0; i < 9; ++i) {
         du = (int)u[i] - ctx->chromakey_uv[0];
         dv = (int)v[i] - ctx->chromakey_uv[1];

         diff += sqrt((du * du + dv * dv) / (255.0 * 255.0 * 2));
     }

     diff /= 9.0;

     if (ctx->blend > 0.0001) {
         return av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0) * 255.0;
     } else {
         return (diff > ctx->similarity) ? 255 : 0;
     }
 }

 static uint16_t do_chromakey_pixel16(ChromakeyContext *ctx, uint16_t u[9], uint16_t v[9])
 {
     double max = ctx->max;
     double diff = 0.0;
     int du, dv, i;

     for (i = 0; i < 9; ++i) {
         du = (int)u[i] - ctx->chromakey_uv[0];
         dv = (int)v[i] - ctx->chromakey_uv[1];

         diff += sqrt((du * du + dv * dv) / (max * max * 2));
     }

     diff /= 9.0;

     if (ctx->blend > 0.0001) {
         return av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0) * max;
     } else {
         return (diff > ctx->similarity) ? max : 0;
     }
 }

 static av_always_inline void get_pixel_uv(AVFrame *frame, int hsub_log2, int vsub_log2, int x, int y, uint8_t *u, uint8_t *v)
 {
     if (x < 0 || x >= frame->width || y < 0 || y >= frame->height)
         return;

     x >>= hsub_log2;
     y >>= vsub_log2;

     *u = frame->data[1][frame->linesize[1] * y + x];
     *v = frame->data[2][frame->linesize[2] * y + x];
 }

 static av_always_inline void get_pixel16_uv(AVFrame *frame, int hsub_log2, int vsub_log2, int x, int y, uint16_t *u, uint16_t *v)
 {
     if (x < 0 || x >= frame->width || y < 0 || y >= frame->height)
         return;

     x >>= hsub_log2;
     y >>= vsub_log2;

     *u = AV_RN16(&frame->data[1][frame->linesize[1] * y + 2 * x]);
     *v = AV_RN16(&frame->data[2][frame->linesize[2] * y + 2 * x]);
 }

 static int do_chromakey_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
 {
     AVFrame *frame = arg;

     const int slice_start = (frame->height * jobnr) / nb_jobs;
     const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;

     ChromakeyContext *ctx = avctx->priv;

     int x, y, xo, yo;
     uint8_t u[9], v[9];

     memset(u, ctx->chromakey_uv[0], sizeof(u));
     memset(v, ctx->chromakey_uv[1], sizeof(v));

     for (y = slice_start; y < slice_end; ++y) {
         for (x = 0; x < frame->width; ++x) {
             for (yo = 0; yo < 3; ++yo) {
                 for (xo = 0; xo < 3; ++xo) {
                     get_pixel_uv(frame, ctx->hsub_log2, ctx->vsub_log2, x + xo - 1, y + yo - 1, &u[yo * 3 + xo], &v[yo * 3 + xo]);
                 }
             }

             frame->data[3][frame->linesize[3] * y + x] = do_chromakey_pixel(ctx, u, v);
         }
     }

     return 0;
 }

 static int do_chromakey16_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
 {
     AVFrame *frame = arg;

     const int slice_start = (frame->height * jobnr) / nb_jobs;
     const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;

     ChromakeyContext *ctx = avctx->priv;

     int x, y, xo, yo;
     uint16_t u[9], v[9];

     for (int i = 0; i < 9; i++) {
         u[i] = ctx->chromakey_uv[0];
         v[i] = ctx->chromakey_uv[1];
     }

     for (y = slice_start; y < slice_end; ++y) {
         for (x = 0; x < frame->width; ++x) {
             uint16_t *dst = (uint16_t *)(frame->data[3] + frame->linesize[3] * y);

             for (yo = 0; yo < 3; ++yo) {
                 for (xo = 0; xo < 3; ++xo) {
                     get_pixel16_uv(frame, ctx->hsub_log2, ctx->vsub_log2, x + xo - 1, y + yo - 1, &u[yo * 3 + xo], &v[yo * 3 + xo]);
                 }
             }

             dst[x] = do_chromakey_pixel16(ctx, u, v);
         }
     }

     return 0;
 }

 static int do_chromahold_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
 {
     ChromakeyContext *ctx = avctx->priv;
     AVFrame *frame = arg;
     const int slice_start = ((frame->height >> ctx->vsub_log2) * jobnr) / nb_jobs;
     const int slice_end = ((frame->height >> ctx->vsub_log2) * (jobnr + 1)) / nb_jobs;

     int x, y, alpha;

     for (y = slice_start; y < slice_end; ++y) {
         for (x = 0; x < frame->width >> ctx->hsub_log2; ++x) {
             int u = frame->data[1][frame->linesize[1] * y + x];
             int v = frame->data[2][frame->linesize[2] * y + x];
             double diff;
             int du, dv;

             du = u - ctx->chromakey_uv[0];
             dv = v - ctx->chromakey_uv[1];

             diff = sqrt((du * du + dv * dv) / (255.0 * 255.0));

             alpha = diff > ctx->similarity;
             if (ctx->blend > 0.0001) {
                 double f = 1. - av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0);

                 frame->data[1][frame->linesize[1] * y + x] = 128 + (u - 128) * f;
                 frame->data[2][frame->linesize[2] * y + x] = 128 + (v - 128) * f;
             } else if (alpha) {
                 frame->data[1][frame->linesize[1] * y + x] = 128;
                 frame->data[2][frame->linesize[2] * y + x] = 128;
             }
         }
     }

     return 0;
 }

 static int do_chromahold16_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
 {
     ChromakeyContext *ctx = avctx->priv;
     AVFrame *frame = arg;
     const int slice_start = ((frame->height >> ctx->vsub_log2) * jobnr) / nb_jobs;
     const int slice_end = ((frame->height >> ctx->vsub_log2) * (jobnr + 1)) / nb_jobs;
     const int mid = ctx->mid;
     double max = ctx->max;

     int x, y, alpha;

     for (y = slice_start; y < slice_end; ++y) {
         for (x = 0; x < frame->width >> ctx->hsub_log2; ++x) {
             int u = AV_RN16(&frame->data[1][frame->linesize[1] * y + 2 * x]);
             int v = AV_RN16(&frame->data[2][frame->linesize[2] * y + 2 * x]);
             double diff;
             int du, dv;

             du = u - ctx->chromakey_uv[0];
             dv = v - ctx->chromakey_uv[1];

             diff = sqrt((du * du + dv * dv) / (max * max));

             alpha = diff > ctx->similarity;
             if (ctx->blend > 0.0001) {
                 double f = 1. - av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0);

                 AV_WN16(&frame->data[1][frame->linesize[1] * y + 2 * x], mid + (u - mid) * f);
                 AV_WN16(&frame->data[2][frame->linesize[2] * y + 2 * x], mid + (v - mid) * f);
             } else if (alpha) {
                 AV_WN16(&frame->data[1][frame->linesize[1] * y + 2 * x], mid);
                 AV_WN16(&frame->data[2][frame->linesize[2] * y + 2 * x], mid);
             }
         }
     }

     return 0;
 }

 static int filter_frame(AVFilterLink *link, AVFrame *frame)
 {
     AVFilterContext *avctx = link->dst;
     ChromakeyContext *ctx = avctx->priv;
     int res;

     if (res = avctx->internal->execute(avctx, ctx->do_slice, frame, NULL, FFMIN(frame->height, ff_filter_get_nb_threads(avctx))))
         return res;

     return ff_filter_frame(avctx->outputs[0], frame);
 }

 #define FIXNUM(x) lrint((x) * (1 << 10))
 #define RGB_TO_U(rgb) (((- FIXNUM(0.16874) * rgb[0] - FIXNUM(0.33126) * rgb[1] + FIXNUM(0.50000) * rgb[2] + (1 << 9) - 1) >> 10) + 128)
 #define RGB_TO_V(rgb) (((  FIXNUM(0.50000) * rgb[0] - FIXNUM(0.41869) * rgb[1] - FIXNUM(0.08131) * rgb[2] + (1 << 9) - 1) >> 10) + 128)

 static av_cold int config_output(AVFilterLink *outlink)
 {
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
     AVFilterContext *avctx = outlink->src;
     ChromakeyContext *ctx = avctx->priv;
     int factor;

     ctx->depth = desc->comp[0].depth;
     ctx->mid = 1 << (ctx->depth - 1);
     ctx->max = (1 << ctx->depth) - 1;

     factor = 1 << (ctx->depth - 8);

     if (ctx->is_yuv) {
         ctx->chromakey_uv[0] = ctx->chromakey_rgba[1] * factor;
         ctx->chromakey_uv[1] = ctx->chromakey_rgba[2] * factor;
     } else {
         ctx->chromakey_uv[0] = RGB_TO_U(ctx->chromakey_rgba) * factor;
         ctx->chromakey_uv[1] = RGB_TO_V(ctx->chromakey_rgba) * factor;
     }

     if (!strcmp(avctx->filter->name, "chromakey")) {
         ctx->do_slice = ctx->depth <= 8 ? do_chromakey_slice : do_chromakey16_slice;
     } else {
         ctx->do_slice = ctx->depth <= 8 ? do_chromahold_slice: do_chromahold16_slice;
     }

     return 0;
 }

 static av_cold int query_formats(AVFilterContext *avctx)
 {
     static const enum AVPixelFormat pixel_fmts[] = {
         AV_PIX_FMT_YUVA420P,
         AV_PIX_FMT_YUVA422P,
         AV_PIX_FMT_YUVA444P,
         AV_PIX_FMT_YUVA420P9,  AV_PIX_FMT_YUVA422P9,  AV_PIX_FMT_YUVA444P9,
         AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
         AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
         AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
         AV_PIX_FMT_NONE
     };

     static const enum AVPixelFormat hold_pixel_fmts[] = {
         AV_PIX_FMT_YUV420P,
         AV_PIX_FMT_YUV422P,
         AV_PIX_FMT_YUV444P,
         AV_PIX_FMT_YUVA420P,
         AV_PIX_FMT_YUVA422P,
         AV_PIX_FMT_YUVA444P,
         AV_PIX_FMT_YUV420P9,   AV_PIX_FMT_YUV422P9,   AV_PIX_FMT_YUV444P9,
         AV_PIX_FMT_YUV420P10,  AV_PIX_FMT_YUV422P10,  AV_PIX_FMT_YUV444P10,
         AV_PIX_FMT_YUV444P12,  AV_PIX_FMT_YUV422P12,  AV_PIX_FMT_YUV420P12,
         AV_PIX_FMT_YUV444P14,  AV_PIX_FMT_YUV422P14,  AV_PIX_FMT_YUV420P14,
         AV_PIX_FMT_YUV420P16,  AV_PIX_FMT_YUV422P16,  AV_PIX_FMT_YUV444P16,
         AV_PIX_FMT_YUVA420P9,  AV_PIX_FMT_YUVA422P9,  AV_PIX_FMT_YUVA444P9,
         AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
         AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
         AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
         AV_PIX_FMT_NONE
     };

     AVFilterFormats *formats = NULL;

     formats = ff_make_format_list(!strcmp(avctx->filter->name, "chromahold") ? hold_pixel_fmts : pixel_fmts);
     if (!formats)
         return AVERROR(ENOMEM);

     return ff_set_common_formats(avctx, formats);
 }

 static av_cold int config_input(AVFilterLink *inlink)
 {
     AVFilterContext *avctx = inlink->dst;
     ChromakeyContext *ctx = avctx->priv;
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);

     ctx->hsub_log2 = desc->log2_chroma_w;
     ctx->vsub_log2 = desc->log2_chroma_h;

     return 0;
 }

 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
                            char *res, int res_len, int flags)
 {
     int ret;

     ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
     if (ret < 0)
         return ret;

     return config_output(ctx->outputs[0]);
 }

 static const AVFilterPad chromakey_inputs[] = {
     {
         .name           = "default",
         .type           = AVMEDIA_TYPE_VIDEO,
         .needs_writable = 1,
         .filter_frame   = filter_frame,
         .config_props   = config_input,
     },
     { NULL }
 };

 static const AVFilterPad chromakey_outputs[] = {
     {
         .name           = "default",
         .type           = AVMEDIA_TYPE_VIDEO,
         .config_props   = config_output,
     },
     { NULL }
 };

 #define OFFSET(x) offsetof(ChromakeyContext, x)
 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM

 static const AVOption chromakey_options[] = {
     { "color", "set the chromakey key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
     { "similarity", "set the chromakey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
     { "blend", "set the chromakey key blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
     { "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
     { NULL }
 };

 AVFILTER_DEFINE_CLASS(chromakey);

 AVFilter ff_vf_chromakey = {
     .name          = "chromakey",
     .description   = NULL_IF_CONFIG_SMALL("Turns a certain color into transparency. Operates on YUV colors."),
     .priv_size     = sizeof(ChromakeyContext),
     .priv_class    = &chromakey_class,
     .query_formats = query_formats,
     .inputs        = chromakey_inputs,
     .outputs       = chromakey_outputs,
     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
     .process_command = process_command,
 };

 static const AVOption chromahold_options[] = {
     { "color", "set the chromahold key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
     { "similarity", "set the chromahold similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
     { "blend", "set the chromahold blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
     { "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
     { NULL }
 };

 static const AVFilterPad chromahold_inputs[] = {
     {
         .name           = "default",
         .type           = AVMEDIA_TYPE_VIDEO,
         .needs_writable = 1,
         .filter_frame   = filter_frame,
         .config_props   = config_input,
     },
     { NULL }
 };

 static const AVFilterPad chromahold_outputs[] = {
     {
         .name           = "default",
         .type           = AVMEDIA_TYPE_VIDEO,
         .config_props   = config_output,
     },
     { NULL }
 };

 AVFILTER_DEFINE_CLASS(chromahold);

 AVFilter ff_vf_chromahold = {
     .name          = "chromahold",
     .description   = NULL_IF_CONFIG_SMALL("Turns a certain color range into gray."),
     .priv_size     = sizeof(ChromakeyContext),
     .priv_class    = &chromahold_class,
     .query_formats = query_formats,
     .inputs        = chromahold_inputs,
     .outputs       = chromahold_outputs,
     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
     .process_command = process_command,
 };
	/*
	* Copyright (c) 2015 Timo Rothenpieler <timo@rothenpieler.org>
	*
	* 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 "libavutil/opt.h"
	#include "libavutil/imgutils.h"
	#include "libavutil/intreadwrite.h"
	#include "avfilter.h"
	#include "formats.h"
	#include "internal.h"
	#include "video.h"

	typedef struct ChromakeyContext {
	const AVClass *class;

	uint8_t chromakey_rgba[4];
	uint16_t chromakey_uv[2];

	float similarity;
	float blend;

	int is_yuv;
	int depth;
	int mid;
	int max;

	int hsub_log2;
	int vsub_log2;

	int (do_slice)(AVFilterContext ctx, void *arg,
	int jobnr, int nb_jobs);
	} ChromakeyContext;

	static uint8_t do_chromakey_pixel(ChromakeyContext *ctx, uint8_t u[9], uint8_t v[9])
	{
	double diff = 0.0;
	int du, dv, i;

	for (i = 0; i < 9; ++i) {
	du = (int)u[i] - ctx->chromakey_uv[0];
	dv = (int)v[i] - ctx->chromakey_uv[1];

	diff += sqrt((du * du + dv * dv) / (255.0 * 255.0 * 2));
	}

	diff /= 9.0;

	if (ctx->blend > 0.0001) {
	return av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0) * 255.0;
	} else {
	return (diff > ctx->similarity) ? 255 : 0;
	}
	}

	static uint16_t do_chromakey_pixel16(ChromakeyContext *ctx, uint16_t u[9], uint16_t v[9])
	{
	double max = ctx->max;
	double diff = 0.0;
	int du, dv, i;

	for (i = 0; i < 9; ++i) {
	du = (int)u[i] - ctx->chromakey_uv[0];
	dv = (int)v[i] - ctx->chromakey_uv[1];

	diff += sqrt((du * du + dv * dv) / (max * max * 2));
	}

	diff /= 9.0;

	if (ctx->blend > 0.0001) {
	return av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0) * max;
	} else {
	return (diff > ctx->similarity) ? max : 0;
	}
	}

	static av_always_inline void get_pixel_uv(AVFrame frame, int hsub_log2, int vsub_log2, int x, int y, uint8_t u, uint8_t *v)
	{
	if (x < 0 \|\| x >= frame->width \|\| y < 0 \|\| y >= frame->height)
	return;

	x >>= hsub_log2;
	y >>= vsub_log2;

	u = frame->data[1][frame->linesize[1] y + x];
	v = frame->data[2][frame->linesize[2] y + x];
	}

	static av_always_inline void get_pixel16_uv(AVFrame frame, int hsub_log2, int vsub_log2, int x, int y, uint16_t u, uint16_t *v)
	{
	if (x < 0 \|\| x >= frame->width \|\| y < 0 \|\| y >= frame->height)
	return;

	x >>= hsub_log2;
	y >>= vsub_log2;

	u = AV_RN16(&frame->data[1][frame->linesize[1] y + 2 * x]);
	v = AV_RN16(&frame->data[2][frame->linesize[2] y + 2 * x]);
	}

	static int do_chromakey_slice(AVFilterContext avctx, void arg, int jobnr, int nb_jobs)
	{
	AVFrame *frame = arg;

	const int slice_start = (frame->height * jobnr) / nb_jobs;
	const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;

	ChromakeyContext *ctx = avctx->priv;

	int x, y, xo, yo;
	uint8_t u[9], v[9];

	memset(u, ctx->chromakey_uv[0], sizeof(u));
	memset(v, ctx->chromakey_uv[1], sizeof(v));

	for (y = slice_start; y < slice_end; ++y) {
	for (x = 0; x < frame->width; ++x) {
	for (yo = 0; yo < 3; ++yo) {
	for (xo = 0; xo < 3; ++xo) {
	get_pixel_uv(frame, ctx->hsub_log2, ctx->vsub_log2, x + xo - 1, y + yo - 1, &u[yo * 3 + xo], &v[yo * 3 + xo]);
	}
	}

	frame->data[3][frame->linesize[3] * y + x] = do_chromakey_pixel(ctx, u, v);
	}
	}

	return 0;
	}

	static int do_chromakey16_slice(AVFilterContext avctx, void arg, int jobnr, int nb_jobs)
	{
	AVFrame *frame = arg;

	const int slice_start = (frame->height * jobnr) / nb_jobs;
	const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;

	ChromakeyContext *ctx = avctx->priv;

	int x, y, xo, yo;
	uint16_t u[9], v[9];

	for (int i = 0; i < 9; i++) {
	u[i] = ctx->chromakey_uv[0];
	v[i] = ctx->chromakey_uv[1];
	}

	for (y = slice_start; y < slice_end; ++y) {
	for (x = 0; x < frame->width; ++x) {
	uint16_t dst = (uint16_t )(frame->data[3] + frame->linesize[3] * y);

	for (yo = 0; yo < 3; ++yo) {
	for (xo = 0; xo < 3; ++xo) {
	get_pixel16_uv(frame, ctx->hsub_log2, ctx->vsub_log2, x + xo - 1, y + yo - 1, &u[yo * 3 + xo], &v[yo * 3 + xo]);
	}
	}

	dst[x] = do_chromakey_pixel16(ctx, u, v);
	}
	}

	return 0;
	}

	static int do_chromahold_slice(AVFilterContext avctx, void arg, int jobnr, int nb_jobs)
	{
	ChromakeyContext *ctx = avctx->priv;
	AVFrame *frame = arg;
	const int slice_start = ((frame->height >> ctx->vsub_log2) * jobnr) / nb_jobs;
	const int slice_end = ((frame->height >> ctx->vsub_log2) * (jobnr + 1)) / nb_jobs;

	int x, y, alpha;

	for (y = slice_start; y < slice_end; ++y) {
	for (x = 0; x < frame->width >> ctx->hsub_log2; ++x) {
	int u = frame->data[1][frame->linesize[1] * y + x];
	int v = frame->data[2][frame->linesize[2] * y + x];
	double diff;
	int du, dv;

	du = u - ctx->chromakey_uv[0];
	dv = v - ctx->chromakey_uv[1];

	diff = sqrt((du * du + dv * dv) / (255.0 * 255.0));

	alpha = diff > ctx->similarity;
	if (ctx->blend > 0.0001) {
	double f = 1. - av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0);

	frame->data[1][frame->linesize[1] * y + x] = 128 + (u - 128) * f;
	frame->data[2][frame->linesize[2] * y + x] = 128 + (v - 128) * f;
	} else if (alpha) {
	frame->data[1][frame->linesize[1] * y + x] = 128;
	frame->data[2][frame->linesize[2] * y + x] = 128;
	}
	}
	}

	return 0;
	}

	static int do_chromahold16_slice(AVFilterContext avctx, void arg, int jobnr, int nb_jobs)
	{
	ChromakeyContext *ctx = avctx->priv;
	AVFrame *frame = arg;
	const int slice_start = ((frame->height >> ctx->vsub_log2) * jobnr) / nb_jobs;
	const int slice_end = ((frame->height >> ctx->vsub_log2) * (jobnr + 1)) / nb_jobs;
	const int mid = ctx->mid;
	double max = ctx->max;

	int x, y, alpha;

	for (y = slice_start; y < slice_end; ++y) {
	for (x = 0; x < frame->width >> ctx->hsub_log2; ++x) {
	int u = AV_RN16(&frame->data[1][frame->linesize[1] * y + 2 * x]);
	int v = AV_RN16(&frame->data[2][frame->linesize[2] * y + 2 * x]);
	double diff;
	int du, dv;

	du = u - ctx->chromakey_uv[0];
	dv = v - ctx->chromakey_uv[1];

	diff = sqrt((du * du + dv * dv) / (max * max));

	alpha = diff > ctx->similarity;
	if (ctx->blend > 0.0001) {
	double f = 1. - av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0);

	AV_WN16(&frame->data[1][frame->linesize[1] * y + 2 * x], mid + (u - mid) * f);
	AV_WN16(&frame->data[2][frame->linesize[2] * y + 2 * x], mid + (v - mid) * f);
	} else if (alpha) {
	AV_WN16(&frame->data[1][frame->linesize[1] * y + 2 * x], mid);
	AV_WN16(&frame->data[2][frame->linesize[2] * y + 2 * x], mid);
	}
	}
	}

	return 0;
	}

	static int filter_frame(AVFilterLink link, AVFrame frame)
	{
	AVFilterContext *avctx = link->dst;
	ChromakeyContext *ctx = avctx->priv;
	int res;

	if (res = avctx->internal->execute(avctx, ctx->do_slice, frame, NULL, FFMIN(frame->height, ff_filter_get_nb_threads(avctx))))
	return res;

	return ff_filter_frame(avctx->outputs[0], frame);
	}

	#define FIXNUM(x) lrint((x) * (1 << 10))
	#define RGB_TO_U(rgb) (((- FIXNUM(0.16874) * rgb[0] - FIXNUM(0.33126) * rgb[1] + FIXNUM(0.50000) * rgb[2] + (1 << 9) - 1) >> 10) + 128)
	#define RGB_TO_V(rgb) ((( FIXNUM(0.50000) * rgb[0] - FIXNUM(0.41869) * rgb[1] - FIXNUM(0.08131) * rgb[2] + (1 << 9) - 1) >> 10) + 128)

	static av_cold int config_output(AVFilterLink *outlink)
	{
	const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
	AVFilterContext *avctx = outlink->src;
	ChromakeyContext *ctx = avctx->priv;
	int factor;

	ctx->depth = desc->comp[0].depth;
	ctx->mid = 1 << (ctx->depth - 1);
	ctx->max = (1 << ctx->depth) - 1;

	factor = 1 << (ctx->depth - 8);

	if (ctx->is_yuv) {
	ctx->chromakey_uv[0] = ctx->chromakey_rgba[1] * factor;
	ctx->chromakey_uv[1] = ctx->chromakey_rgba[2] * factor;
	} else {
	ctx->chromakey_uv[0] = RGB_TO_U(ctx->chromakey_rgba) * factor;
	ctx->chromakey_uv[1] = RGB_TO_V(ctx->chromakey_rgba) * factor;
	}

	if (!strcmp(avctx->filter->name, "chromakey")) {
	ctx->do_slice = ctx->depth <= 8 ? do_chromakey_slice : do_chromakey16_slice;
	} else {
	ctx->do_slice = ctx->depth <= 8 ? do_chromahold_slice: do_chromahold16_slice;
	}

	return 0;
	}

	static av_cold int query_formats(AVFilterContext *avctx)
	{
	static const enum AVPixelFormat pixel_fmts[] = {
	AV_PIX_FMT_YUVA420P,
	AV_PIX_FMT_YUVA422P,
	AV_PIX_FMT_YUVA444P,
	AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
	AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
	AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
	AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
	AV_PIX_FMT_NONE
	};

	static const enum AVPixelFormat hold_pixel_fmts[] = {
	AV_PIX_FMT_YUV420P,
	AV_PIX_FMT_YUV422P,
	AV_PIX_FMT_YUV444P,
	AV_PIX_FMT_YUVA420P,
	AV_PIX_FMT_YUVA422P,
	AV_PIX_FMT_YUVA444P,
	AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
	AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
	AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
	AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
	AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
	AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
	AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
	AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
	AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
	AV_PIX_FMT_NONE
	};

	AVFilterFormats *formats = NULL;

	formats = ff_make_format_list(!strcmp(avctx->filter->name, "chromahold") ? hold_pixel_fmts : pixel_fmts);
	if (!formats)
	return AVERROR(ENOMEM);

	return ff_set_common_formats(avctx, formats);
	}

	static av_cold int config_input(AVFilterLink *inlink)
	{
	AVFilterContext *avctx = inlink->dst;
	ChromakeyContext *ctx = avctx->priv;
	const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);

	ctx->hsub_log2 = desc->log2_chroma_w;
	ctx->vsub_log2 = desc->log2_chroma_h;

	return 0;
	}

	static int process_command(AVFilterContext ctx, const char cmd, const char *args,
	char *res, int res_len, int flags)
	{
	int ret;

	ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
	if (ret < 0)
	return ret;

	return config_output(ctx->outputs[0]);
	}

	static const AVFilterPad chromakey_inputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.needs_writable = 1,
	.filter_frame = filter_frame,
	.config_props = config_input,
	},
	{ NULL }
	};

	static const AVFilterPad chromakey_outputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.config_props = config_output,
	},
	{ NULL }
	};

	#define OFFSET(x) offsetof(ChromakeyContext, x)
	#define FLAGS AV_OPT_FLAG_FILTERING_PARAM\|AV_OPT_FLAG_VIDEO_PARAM\|AV_OPT_FLAG_RUNTIME_PARAM

	static const AVOption chromakey_options[] = {
	{ "color", "set the chromakey key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
	{ "similarity", "set the chromakey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
	{ "blend", "set the chromakey key blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
	{ "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
	{ NULL }
	};

	AVFILTER_DEFINE_CLASS(chromakey);

	AVFilter ff_vf_chromakey = {
	.name = "chromakey",
	.description = NULL_IF_CONFIG_SMALL("Turns a certain color into transparency. Operates on YUV colors."),
	.priv_size = sizeof(ChromakeyContext),
	.priv_class = &chromakey_class,
	.query_formats = query_formats,
	.inputs = chromakey_inputs,
	.outputs = chromakey_outputs,
	.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC \| AVFILTER_FLAG_SLICE_THREADS,
	.process_command = process_command,
	};

	static const AVOption chromahold_options[] = {
	{ "color", "set the chromahold key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
	{ "similarity", "set the chromahold similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
	{ "blend", "set the chromahold blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
	{ "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
	{ NULL }
	};

	static const AVFilterPad chromahold_inputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.needs_writable = 1,
	.filter_frame = filter_frame,
	.config_props = config_input,
	},
	{ NULL }
	};

	static const AVFilterPad chromahold_outputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.config_props = config_output,
	},
	{ NULL }
	};

	AVFILTER_DEFINE_CLASS(chromahold);

	AVFilter ff_vf_chromahold = {
	.name = "chromahold",
	.description = NULL_IF_CONFIG_SMALL("Turns a certain color range into gray."),
	.priv_size = sizeof(ChromakeyContext),
	.priv_class = &chromahold_class,
	.query_formats = query_formats,
	.inputs = chromahold_inputs,
	.outputs = chromahold_outputs,
	.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC \| AVFILTER_FLAG_SLICE_THREADS,
	.process_command = process_command,
	};