libavfilter/vf_colorkey.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 "avfilter.h"
 #include "formats.h"
 #include "internal.h"
 #include "video.h"

 typedef struct ColorkeyContext {
     const AVClass *class;

     /* color offsets rgba */
     int co[4];

     uint8_t colorkey_rgba[4];
     float similarity;
     float blend;

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

 static uint8_t do_colorkey_pixel(ColorkeyContext *ctx, uint8_t r, uint8_t g, uint8_t b)
 {
     int dr = (int)r - ctx->colorkey_rgba[0];
     int dg = (int)g - ctx->colorkey_rgba[1];
     int db = (int)b - ctx->colorkey_rgba[2];

     double diff = sqrt((dr * dr + dg * dg + db * db) / (255.0 * 255.0 * 3.0));

     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 int do_colorkey_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;

     ColorkeyContext *ctx = avctx->priv;

     int o, x, y;

     for (y = slice_start; y < slice_end; ++y) {
         for (x = 0; x < frame->width; ++x) {
             o = frame->linesize[0] * y + x * 4;

             frame->data[0][o + ctx->co[3]] =
                 do_colorkey_pixel(ctx,
                                   frame->data[0][o + ctx->co[0]],
                                   frame->data[0][o + ctx->co[1]],
                                   frame->data[0][o + ctx->co[2]]);
         }
     }

     return 0;
 }

 static int do_colorhold_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;

     ColorkeyContext *ctx = avctx->priv;

     int x, y;

     for (y = slice_start; y < slice_end; ++y) {
         for (x = 0; x < frame->width; ++x) {
             int o, t, r, g, b;

             o = frame->linesize[0] * y + x * 4;
             r = frame->data[0][o + ctx->co[0]];
             g = frame->data[0][o + ctx->co[1]];
             b = frame->data[0][o + ctx->co[2]];

             t = do_colorkey_pixel(ctx, r, g, b);

             if (t > 0) {
                 int a = (r + g + b) / 3;
                 int rt = 255 - t;

                 frame->data[0][o + ctx->co[0]] = (a * t + r * rt + 127) >> 8;
                 frame->data[0][o + ctx->co[1]] = (a * t + g * rt + 127) >> 8;
                 frame->data[0][o + ctx->co[2]] = (a * t + b * rt + 127) >> 8;
             }
         }
     }

     return 0;
 }

 static av_cold int init_filter(AVFilterContext *avctx)
 {
     ColorkeyContext *ctx = avctx->priv;

     if (!strcmp(avctx->filter->name, "colorkey")) {
         ctx->do_slice = do_colorkey_slice;
     } else {
         ctx->do_slice = do_colorhold_slice;
     }

     return 0;
 }

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

     if (res = av_frame_make_writable(frame))
         return 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);
 }

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

     outlink->w = avctx->inputs[0]->w;
     outlink->h = avctx->inputs[0]->h;
     outlink->time_base = avctx->inputs[0]->time_base;

     for (i = 0; i < 4; ++i)
         ctx->co[i] = desc->comp[i].offset;

     return 0;
 }

 static av_cold int query_formats(AVFilterContext *avctx)
 {
     static const enum AVPixelFormat pixel_fmts[] = {
         AV_PIX_FMT_ARGB,
         AV_PIX_FMT_RGBA,
         AV_PIX_FMT_ABGR,
         AV_PIX_FMT_BGRA,
         AV_PIX_FMT_NONE
     };

     AVFilterFormats *formats = NULL;

     formats = ff_make_format_list(pixel_fmts);
     if (!formats)
         return AVERROR(ENOMEM);

     return ff_set_common_formats(avctx, formats);
 }

 static const AVFilterPad colorkey_inputs[] = {
     {
         .name = "default",
         .type = AVMEDIA_TYPE_VIDEO,
         .filter_frame = filter_frame,
     },
     { NULL }
 };

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

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

 #if CONFIG_COLORKEY_FILTER

 static const AVOption colorkey_options[] = {
     { "color", "set the colorkey key color", OFFSET(colorkey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
     { "similarity", "set the colorkey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
     { "blend", "set the colorkey key blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
     { NULL }
 };

 AVFILTER_DEFINE_CLASS(colorkey);

 AVFilter ff_vf_colorkey = {
     .name          = "colorkey",
     .description   = NULL_IF_CONFIG_SMALL("Turns a certain color into transparency. Operates on RGB colors."),
     .priv_size     = sizeof(ColorkeyContext),
     .priv_class    = &colorkey_class,
     .query_formats = query_formats,
     .init          = init_filter,
     .inputs        = colorkey_inputs,
     .outputs       = colorkey_outputs,
     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
     .process_command = ff_filter_process_command,
 };

 #endif /* CONFIG_COLORKEY_FILTER */
 #if CONFIG_COLORHOLD_FILTER

 static const AVOption colorhold_options[] = {
     { "color", "set the colorhold key color", OFFSET(colorkey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
     { "similarity", "set the colorhold similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
     { "blend", "set the colorhold blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
     { NULL }
 };

 AVFILTER_DEFINE_CLASS(colorhold);

 AVFilter ff_vf_colorhold = {
     .name          = "colorhold",
     .description   = NULL_IF_CONFIG_SMALL("Turns a certain color range into gray. Operates on RGB colors."),
     .priv_size     = sizeof(ColorkeyContext),
     .priv_class    = &colorhold_class,
     .query_formats = query_formats,
     .init          = init_filter,
     .inputs        = colorkey_inputs,
     .outputs       = colorkey_outputs,
     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
     .process_command = ff_filter_process_command,
 };

 #endif /* CONFIG_COLORHOLD_FILTER */
	/*
	* 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 "avfilter.h"
	#include "formats.h"
	#include "internal.h"
	#include "video.h"

	typedef struct ColorkeyContext {
	const AVClass *class;

	/* color offsets rgba */
	int co[4];

	uint8_t colorkey_rgba[4];
	float similarity;
	float blend;

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

	static uint8_t do_colorkey_pixel(ColorkeyContext *ctx, uint8_t r, uint8_t g, uint8_t b)
	{
	int dr = (int)r - ctx->colorkey_rgba[0];
	int dg = (int)g - ctx->colorkey_rgba[1];
	int db = (int)b - ctx->colorkey_rgba[2];

	double diff = sqrt((dr * dr + dg * dg + db * db) / (255.0 * 255.0 * 3.0));

	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 int do_colorkey_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;

	ColorkeyContext *ctx = avctx->priv;

	int o, x, y;

	for (y = slice_start; y < slice_end; ++y) {
	for (x = 0; x < frame->width; ++x) {
	o = frame->linesize[0] * y + x * 4;

	frame->data[0][o + ctx->co[3]] =
	do_colorkey_pixel(ctx,
	frame->data[0][o + ctx->co[0]],
	frame->data[0][o + ctx->co[1]],
	frame->data[0][o + ctx->co[2]]);
	}
	}

	return 0;
	}

	static int do_colorhold_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;

	ColorkeyContext *ctx = avctx->priv;

	int x, y;

	for (y = slice_start; y < slice_end; ++y) {
	for (x = 0; x < frame->width; ++x) {
	int o, t, r, g, b;

	o = frame->linesize[0] * y + x * 4;
	r = frame->data[0][o + ctx->co[0]];
	g = frame->data[0][o + ctx->co[1]];
	b = frame->data[0][o + ctx->co[2]];

	t = do_colorkey_pixel(ctx, r, g, b);

	if (t > 0) {
	int a = (r + g + b) / 3;
	int rt = 255 - t;

	frame->data[0][o + ctx->co[0]] = (a * t + r * rt + 127) >> 8;
	frame->data[0][o + ctx->co[1]] = (a * t + g * rt + 127) >> 8;
	frame->data[0][o + ctx->co[2]] = (a * t + b * rt + 127) >> 8;
	}
	}
	}

	return 0;
	}

	static av_cold int init_filter(AVFilterContext *avctx)
	{
	ColorkeyContext *ctx = avctx->priv;

	if (!strcmp(avctx->filter->name, "colorkey")) {
	ctx->do_slice = do_colorkey_slice;
	} else {
	ctx->do_slice = do_colorhold_slice;
	}

	return 0;
	}

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

	if (res = av_frame_make_writable(frame))
	return 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);
	}

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

	outlink->w = avctx->inputs[0]->w;
	outlink->h = avctx->inputs[0]->h;
	outlink->time_base = avctx->inputs[0]->time_base;

	for (i = 0; i < 4; ++i)
	ctx->co[i] = desc->comp[i].offset;

	return 0;
	}

	static av_cold int query_formats(AVFilterContext *avctx)
	{
	static const enum AVPixelFormat pixel_fmts[] = {
	AV_PIX_FMT_ARGB,
	AV_PIX_FMT_RGBA,
	AV_PIX_FMT_ABGR,
	AV_PIX_FMT_BGRA,
	AV_PIX_FMT_NONE
	};

	AVFilterFormats *formats = NULL;

	formats = ff_make_format_list(pixel_fmts);
	if (!formats)
	return AVERROR(ENOMEM);

	return ff_set_common_formats(avctx, formats);
	}

	static const AVFilterPad colorkey_inputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.filter_frame = filter_frame,
	},
	{ NULL }
	};

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

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

	#if CONFIG_COLORKEY_FILTER

	static const AVOption colorkey_options[] = {
	{ "color", "set the colorkey key color", OFFSET(colorkey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
	{ "similarity", "set the colorkey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
	{ "blend", "set the colorkey key blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
	{ NULL }
	};

	AVFILTER_DEFINE_CLASS(colorkey);

	AVFilter ff_vf_colorkey = {
	.name = "colorkey",
	.description = NULL_IF_CONFIG_SMALL("Turns a certain color into transparency. Operates on RGB colors."),
	.priv_size = sizeof(ColorkeyContext),
	.priv_class = &colorkey_class,
	.query_formats = query_formats,
	.init = init_filter,
	.inputs = colorkey_inputs,
	.outputs = colorkey_outputs,
	.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC \| AVFILTER_FLAG_SLICE_THREADS,
	.process_command = ff_filter_process_command,
	};

	#endif /* CONFIG_COLORKEY_FILTER */
	#if CONFIG_COLORHOLD_FILTER

	static const AVOption colorhold_options[] = {
	{ "color", "set the colorhold key color", OFFSET(colorkey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
	{ "similarity", "set the colorhold similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
	{ "blend", "set the colorhold blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
	{ NULL }
	};

	AVFILTER_DEFINE_CLASS(colorhold);

	AVFilter ff_vf_colorhold = {
	.name = "colorhold",
	.description = NULL_IF_CONFIG_SMALL("Turns a certain color range into gray. Operates on RGB colors."),
	.priv_size = sizeof(ColorkeyContext),
	.priv_class = &colorhold_class,
	.query_formats = query_formats,
	.init = init_filter,
	.inputs = colorkey_inputs,
	.outputs = colorkey_outputs,
	.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC \| AVFILTER_FLAG_SLICE_THREADS,
	.process_command = ff_filter_process_command,
	};

	#endif /* CONFIG_COLORHOLD_FILTER */