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

 /*
  * Copyright (c) 2018 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 "libavutil/imgutils.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"

 #include "avfilter.h"
 #include "formats.h"
 #include "internal.h"
 #include "video.h"

 typedef struct AmplifyContext {
     const AVClass *class;
     const AVPixFmtDescriptor *desc;
     int radius;
     float factor;
     float threshold;
     float tolerance;
     int planes;

     int llimit;
     int hlimit;
     int nb_inputs;
     int nb_frames;

     int depth;
     int nb_planes;
     int linesize[4];
     int height[4];

     AVFrame **frames;
 } AmplifyContext;

 static int query_formats(AVFilterContext *ctx)
 {
     static const enum AVPixelFormat pixel_fmts[] = {
         AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9,
         AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
         AV_PIX_FMT_GRAY16,
         AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
         AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
         AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
         AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
         AV_PIX_FMT_YUVJ411P,
         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_YUV440P10,
         AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
         AV_PIX_FMT_YUV440P12,
         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_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
         AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
         AV_PIX_FMT_YUVA420P,  AV_PIX_FMT_YUVA422P,   AV_PIX_FMT_YUVA444P,
         AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
         AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16,
         AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
         AV_PIX_FMT_GBRAP,     AV_PIX_FMT_GBRAP10,    AV_PIX_FMT_GBRAP12,    AV_PIX_FMT_GBRAP16,
         AV_PIX_FMT_NONE
     };
     AVFilterFormats *formats = ff_make_format_list(pixel_fmts);
     if (!formats)
         return AVERROR(ENOMEM);
     return ff_set_common_formats(ctx, formats);
 }

 static av_cold int init(AVFilterContext *ctx)
 {
     AmplifyContext *s = ctx->priv;

     s->nb_inputs = s->radius * 2 + 1;

     s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
     if (!s->frames)
         return AVERROR(ENOMEM);

     return 0;
 }

 typedef struct ThreadData {
     AVFrame **in, *out;
 } ThreadData;

 static int amplify_frame(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
 {
     AmplifyContext *s = ctx->priv;
     ThreadData *td = arg;
     AVFrame **in = td->in;
     AVFrame *out = td->out;
     const int radius = s->radius;
     const int nb_inputs = s->nb_inputs;
     const float threshold = s->threshold;
     const float tolerance = s->tolerance;
     const float factor = s->factor;
     const int llimit = s->llimit;
     const int hlimit = s->hlimit;
     const int depth = s->depth;
     int i, p, x, y;

     if (s->depth <= 8) {
         for (p = 0; p < s->nb_planes; p++) {
             const int slice_start = (s->height[p] * jobnr) / nb_jobs;
             const int slice_end = (s->height[p] * (jobnr+1)) / nb_jobs;
             uint8_t *dst = out->data[p] + slice_start * out->linesize[p];

             if (!((1 << p) & s->planes)) {
                 av_image_copy_plane(dst, out->linesize[p],
                                     in[radius]->data[p] + slice_start * in[radius]->linesize[p],
                                     in[radius]->linesize[p],
                                     s->linesize[p], slice_end - slice_start);
                 continue;
             }

             for (y = slice_start; y < slice_end; y++) {
                 for (x = 0; x < s->linesize[p]; x++) {
                     int src = in[radius]->data[p][y * in[radius]->linesize[p] + x];
                     float diff, avg;
                     int sum = 0;

                     for (i = 0; i < nb_inputs; i++) {
                         sum += in[i]->data[p][y * in[i]->linesize[p] + x];
                     }

                     avg = sum / (float)nb_inputs;
                     diff = src - avg;
                     if (fabsf(diff) < threshold && fabsf(diff) > tolerance) {
                         int amp;
                         if (diff < 0) {
                             amp = -FFMIN(FFABS(diff * factor), llimit);
                         } else {
                             amp = FFMIN(FFABS(diff * factor), hlimit);
                         }
                         dst[x] = av_clip_uint8(src + amp);
                     } else {
                         dst[x] = src;
                     }
                 }

                 dst += out->linesize[p];
             }
         }
     } else {
         for (p = 0; p < s->nb_planes; p++) {
             const int slice_start = (s->height[p] * jobnr) / nb_jobs;
             const int slice_end = (s->height[p] * (jobnr+1)) / nb_jobs;
             uint16_t *dst = (uint16_t *)(out->data[p] + slice_start * out->linesize[p]);

             if (!((1 << p) & s->planes)) {
                 av_image_copy_plane((uint8_t *)dst, out->linesize[p],
                                     in[radius]->data[p] + slice_start * in[radius]->linesize[p],
                                     in[radius]->linesize[p],
                                     s->linesize[p], slice_end - slice_start);
                 continue;
             }

             for (y = slice_start; y < slice_end; y++) {
                 for (x = 0; x < s->linesize[p] / 2; x++) {
                     int src = AV_RN16(in[radius]->data[p] + y * in[radius]->linesize[p] + x * 2);
                     float diff, avg;
                     int sum = 0;

                     for (i = 0; i < nb_inputs; i++) {
                         sum += AV_RN16(in[i]->data[p] + y * in[i]->linesize[p] + x * 2);
                     }

                     avg = sum / (float)nb_inputs;
                     diff = src - avg;

                     if (fabsf(diff) < threshold && fabsf(diff) > tolerance) {
                         int amp;
                         if (diff < 0) {
                             amp = -FFMIN(FFABS(diff * factor), llimit);
                         } else {
                             amp = FFMIN(FFABS(diff * factor), hlimit);
                         }
                         dst[x] = av_clip_uintp2_c(src + amp, depth);
                     } else {
                         dst[x] = src;
                     }
                 }

                 dst += out->linesize[p] / 2;
             }
         }
     }

     return 0;
 }

 static int config_output(AVFilterLink *outlink)
 {
     AVFilterContext *ctx = outlink->src;
     AmplifyContext *s = ctx->priv;
     AVFilterLink *inlink = ctx->inputs[0];
     int ret;

     s->desc = av_pix_fmt_desc_get(outlink->format);
     if (!s->desc)
         return AVERROR_BUG;
     s->nb_planes = av_pix_fmt_count_planes(outlink->format);
     s->depth = s->desc->comp[0].depth;

     if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
         return ret;

     s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
     s->height[0] = s->height[3] = inlink->h;

     return 0;
 }

 static av_cold void uninit(AVFilterContext *ctx)
 {
     AmplifyContext *s = ctx->priv;
     int i;

     if (s->frames) {
         for (i = 0; i < s->nb_frames; i++)
             av_frame_free(&s->frames[i]);
     }
     av_freep(&s->frames);
 }

 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 {
     AVFilterContext *ctx = inlink->dst;
     AVFilterLink *outlink = ctx->outputs[0];
     AmplifyContext *s = ctx->priv;
     ThreadData td;
     AVFrame *out;

     if (s->nb_frames < s->nb_inputs) {
         s->frames[s->nb_frames] = in;
         s->nb_frames++;
         return 0;
     } else {
         av_frame_free(&s->frames[0]);
         memmove(&s->frames[0], &s->frames[1], sizeof(*s->frames) * (s->nb_inputs - 1));
         s->frames[s->nb_inputs - 1] = in;
     }

     if (!ctx->is_disabled) {
         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
         if (!out)
             return AVERROR(ENOMEM);
         av_frame_copy_props(out, s->frames[0]);

         td.out = out;
         td.in = s->frames;
         ctx->internal->execute(ctx, amplify_frame, &td, NULL, FFMIN(s->height[1], ff_filter_get_nb_threads(ctx)));
     } else {
         out = av_frame_clone(s->frames[s->radius]);
         if (!out)
             return AVERROR(ENOMEM);
         out->pts = s->frames[0]->pts;
     }

     return ff_filter_frame(outlink, out);
 }

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

 static const AVOption amplify_options[] = {
     { "radius", "set radius", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=2}, 1, 63, .flags = FLAGS },
     { "factor", "set factor", OFFSET(factor), AV_OPT_TYPE_FLOAT, {.dbl=2}, 0, UINT16_MAX, .flags = VFT },
     { "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_FLOAT, {.dbl=10}, 0, UINT16_MAX, .flags = VFT },
     { "tolerance", "set tolerance", OFFSET(tolerance), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, UINT16_MAX, .flags = VFT },
     { "low", "set low limit for amplification", OFFSET(llimit), AV_OPT_TYPE_INT, {.i64=UINT16_MAX}, 0, UINT16_MAX, .flags = VFT },
     { "high", "set high limit for amplification", OFFSET(hlimit), AV_OPT_TYPE_INT, {.i64=UINT16_MAX}, 0, UINT16_MAX, .flags = VFT },
     { "planes", "set what planes to filter", OFFSET(planes), AV_OPT_TYPE_FLAGS, {.i64=7},    0, 15,  VFT },
     { NULL },
 };

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

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

 AVFILTER_DEFINE_CLASS(amplify);

 AVFilter ff_vf_amplify = {
     .name          = "amplify",
     .description   = NULL_IF_CONFIG_SMALL("Amplify changes between successive video frames."),
     .priv_size     = sizeof(AmplifyContext),
     .priv_class    = &amplify_class,
     .query_formats = query_formats,
     .outputs       = outputs,
     .inputs        = inputs,
     .init          = init,
     .uninit        = uninit,
     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
     .process_command = ff_filter_process_command,
 };
	/*
	* Copyright (c) 2018 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 "libavutil/imgutils.h"
	#include "libavutil/intreadwrite.h"
	#include "libavutil/opt.h"
	#include "libavutil/pixdesc.h"

	#include "avfilter.h"
	#include "formats.h"
	#include "internal.h"
	#include "video.h"

	typedef struct AmplifyContext {
	const AVClass *class;
	const AVPixFmtDescriptor *desc;
	int radius;
	float factor;
	float threshold;
	float tolerance;
	int planes;

	int llimit;
	int hlimit;
	int nb_inputs;
	int nb_frames;

	int depth;
	int nb_planes;
	int linesize[4];
	int height[4];

	AVFrame **frames;
	} AmplifyContext;

	static int query_formats(AVFilterContext *ctx)
	{
	static const enum AVPixelFormat pixel_fmts[] = {
	AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9,
	AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
	AV_PIX_FMT_GRAY16,
	AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
	AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
	AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
	AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
	AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
	AV_PIX_FMT_YUVJ411P,
	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_YUV440P10,
	AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
	AV_PIX_FMT_YUV440P12,
	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_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
	AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
	AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
	AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
	AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16,
	AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
	AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
	AV_PIX_FMT_NONE
	};
	AVFilterFormats *formats = ff_make_format_list(pixel_fmts);
	if (!formats)
	return AVERROR(ENOMEM);
	return ff_set_common_formats(ctx, formats);
	}

	static av_cold int init(AVFilterContext *ctx)
	{
	AmplifyContext *s = ctx->priv;

	s->nb_inputs = s->radius * 2 + 1;

	s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
	if (!s->frames)
	return AVERROR(ENOMEM);

	return 0;
	}

	typedef struct ThreadData {
	AVFrame *in, out;
	} ThreadData;

	static int amplify_frame(AVFilterContext ctx, void arg, int jobnr, int nb_jobs)
	{
	AmplifyContext *s = ctx->priv;
	ThreadData *td = arg;
	AVFrame **in = td->in;
	AVFrame *out = td->out;
	const int radius = s->radius;
	const int nb_inputs = s->nb_inputs;
	const float threshold = s->threshold;
	const float tolerance = s->tolerance;
	const float factor = s->factor;
	const int llimit = s->llimit;
	const int hlimit = s->hlimit;
	const int depth = s->depth;
	int i, p, x, y;

	if (s->depth <= 8) {
	for (p = 0; p < s->nb_planes; p++) {
	const int slice_start = (s->height[p] * jobnr) / nb_jobs;
	const int slice_end = (s->height[p] * (jobnr+1)) / nb_jobs;
	uint8_t dst = out->data[p] + slice_start out->linesize[p];

	if (!((1 << p) & s->planes)) {
	av_image_copy_plane(dst, out->linesize[p],
	in[radius]->data[p] + slice_start * in[radius]->linesize[p],
	in[radius]->linesize[p],
	s->linesize[p], slice_end - slice_start);
	continue;
	}

	for (y = slice_start; y < slice_end; y++) {
	for (x = 0; x < s->linesize[p]; x++) {
	int src = in[radius]->data[p][y * in[radius]->linesize[p] + x];
	float diff, avg;
	int sum = 0;

	for (i = 0; i < nb_inputs; i++) {
	sum += in[i]->data[p][y * in[i]->linesize[p] + x];
	}

	avg = sum / (float)nb_inputs;
	diff = src - avg;
	if (fabsf(diff) < threshold && fabsf(diff) > tolerance) {
	int amp;
	if (diff < 0) {
	amp = -FFMIN(FFABS(diff * factor), llimit);
	} else {
	amp = FFMIN(FFABS(diff * factor), hlimit);
	}
	dst[x] = av_clip_uint8(src + amp);
	} else {
	dst[x] = src;
	}
	}

	dst += out->linesize[p];
	}
	}
	} else {
	for (p = 0; p < s->nb_planes; p++) {
	const int slice_start = (s->height[p] * jobnr) / nb_jobs;
	const int slice_end = (s->height[p] * (jobnr+1)) / nb_jobs;
	uint16_t dst = (uint16_t )(out->data[p] + slice_start * out->linesize[p]);

	if (!((1 << p) & s->planes)) {
	av_image_copy_plane((uint8_t *)dst, out->linesize[p],
	in[radius]->data[p] + slice_start * in[radius]->linesize[p],
	in[radius]->linesize[p],
	s->linesize[p], slice_end - slice_start);
	continue;
	}

	for (y = slice_start; y < slice_end; y++) {
	for (x = 0; x < s->linesize[p] / 2; x++) {
	int src = AV_RN16(in[radius]->data[p] + y * in[radius]->linesize[p] + x * 2);
	float diff, avg;
	int sum = 0;

	for (i = 0; i < nb_inputs; i++) {
	sum += AV_RN16(in[i]->data[p] + y * in[i]->linesize[p] + x * 2);
	}

	avg = sum / (float)nb_inputs;
	diff = src - avg;

	if (fabsf(diff) < threshold && fabsf(diff) > tolerance) {
	int amp;
	if (diff < 0) {
	amp = -FFMIN(FFABS(diff * factor), llimit);
	} else {
	amp = FFMIN(FFABS(diff * factor), hlimit);
	}
	dst[x] = av_clip_uintp2_c(src + amp, depth);
	} else {
	dst[x] = src;
	}
	}

	dst += out->linesize[p] / 2;
	}
	}
	}

	return 0;
	}

	static int config_output(AVFilterLink *outlink)
	{
	AVFilterContext *ctx = outlink->src;
	AmplifyContext *s = ctx->priv;
	AVFilterLink *inlink = ctx->inputs[0];
	int ret;

	s->desc = av_pix_fmt_desc_get(outlink->format);
	if (!s->desc)
	return AVERROR_BUG;
	s->nb_planes = av_pix_fmt_count_planes(outlink->format);
	s->depth = s->desc->comp[0].depth;

	if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
	return ret;

	s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
	s->height[0] = s->height[3] = inlink->h;

	return 0;
	}

	static av_cold void uninit(AVFilterContext *ctx)
	{
	AmplifyContext *s = ctx->priv;
	int i;

	if (s->frames) {
	for (i = 0; i < s->nb_frames; i++)
	av_frame_free(&s->frames[i]);
	}
	av_freep(&s->frames);
	}

	static int filter_frame(AVFilterLink inlink, AVFrame in)
	{
	AVFilterContext *ctx = inlink->dst;
	AVFilterLink *outlink = ctx->outputs[0];
	AmplifyContext *s = ctx->priv;
	ThreadData td;
	AVFrame *out;

	if (s->nb_frames < s->nb_inputs) {
	s->frames[s->nb_frames] = in;
	s->nb_frames++;
	return 0;
	} else {
	av_frame_free(&s->frames[0]);
	memmove(&s->frames[0], &s->frames[1], sizeof(s->frames) (s->nb_inputs - 1));
	s->frames[s->nb_inputs - 1] = in;
	}

	if (!ctx->is_disabled) {
	out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
	if (!out)
	return AVERROR(ENOMEM);
	av_frame_copy_props(out, s->frames[0]);

	td.out = out;
	td.in = s->frames;
	ctx->internal->execute(ctx, amplify_frame, &td, NULL, FFMIN(s->height[1], ff_filter_get_nb_threads(ctx)));
	} else {
	out = av_frame_clone(s->frames[s->radius]);
	if (!out)
	return AVERROR(ENOMEM);
	out->pts = s->frames[0]->pts;
	}

	return ff_filter_frame(outlink, out);
	}

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

	static const AVOption amplify_options[] = {
	{ "radius", "set radius", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=2}, 1, 63, .flags = FLAGS },
	{ "factor", "set factor", OFFSET(factor), AV_OPT_TYPE_FLOAT, {.dbl=2}, 0, UINT16_MAX, .flags = VFT },
	{ "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_FLOAT, {.dbl=10}, 0, UINT16_MAX, .flags = VFT },
	{ "tolerance", "set tolerance", OFFSET(tolerance), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, UINT16_MAX, .flags = VFT },
	{ "low", "set low limit for amplification", OFFSET(llimit), AV_OPT_TYPE_INT, {.i64=UINT16_MAX}, 0, UINT16_MAX, .flags = VFT },
	{ "high", "set high limit for amplification", OFFSET(hlimit), AV_OPT_TYPE_INT, {.i64=UINT16_MAX}, 0, UINT16_MAX, .flags = VFT },
	{ "planes", "set what planes to filter", OFFSET(planes), AV_OPT_TYPE_FLAGS, {.i64=7}, 0, 15, VFT },
	{ NULL },
	};

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

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

	AVFILTER_DEFINE_CLASS(amplify);

	AVFilter ff_vf_amplify = {
	.name = "amplify",
	.description = NULL_IF_CONFIG_SMALL("Amplify changes between successive video frames."),
	.priv_size = sizeof(AmplifyContext),
	.priv_class = &amplify_class,
	.query_formats = query_formats,
	.outputs = outputs,
	.inputs = inputs,
	.init = init,
	.uninit = uninit,
	.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL \| AVFILTER_FLAG_SLICE_THREADS,
	.process_command = ff_filter_process_command,
	};