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

 /*
  * Copyright (c) 2020 Paul B Mahol
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */

 #include "libavutil/imgutils.h"
 #include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"
 #include "avfilter.h"
 #include "formats.h"
 #include "internal.h"
 #include "video.h"

 typedef struct DBlurContext {
     const AVClass *class;

     float angle;
     float radius;
     int planes;

     float b0, b1, q, c, R3;

     int depth;
     int planewidth[4];
     int planeheight[4];
     float *buffer;
     int nb_planes;
     void (*horiz_slice)(float *buffer, int width, int height, int steps, float nu, float bscale);
 } DBlurContext;

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

 static const AVOption dblur_options[] = {
     { "angle",  "set angle",            OFFSET(angle),  AV_OPT_TYPE_FLOAT, {.dbl=45},  0.0,  360, FLAGS },
     { "radius", "set radius",           OFFSET(radius), AV_OPT_TYPE_FLOAT, {.dbl=5},     1, 8192, FLAGS },
     { "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT,   {.i64=0xF},   0,  0xF, FLAGS },
     { NULL }
 };

 AVFILTER_DEFINE_CLASS(dblur);

 #define f(n, m) (dst[(n) * width + (m)])

 static int filter_horizontally(AVFilterContext *ctx, int width, int height)
 {
     DBlurContext *s = ctx->priv;
     const float b0 = s->b0;
     const float b1 = s->b1;
     const float q = s->q;
     const float c = s->c;
     float *dst = s->buffer;
     float g;

     if (s->R3 > 0) {
         for (int y = 1; y < height - 1; y++) {
             g = q * f(0, 0) + c * f(0, 0);
             for (int x = 0; x < width; x++) {
                 f(y, x) = b0 * f(y, x) + b1 * f(y - 1, x) + g;
                 g = q * f(y, x) + c * f(y - 1, x);
             }
         }

         for (int y = height - 2; y >= 0; y--) {
             g = q * f(y, width - 1) + c * f(y, width - 1);
             for (int x = width - 1; x >= 0; x--) {
                 f(y, x) = b0 * f(y, x) + b1 * f(y + 1, x) + g;
                 g = q * f(y, x) + c * f(y + 1, x);
             }
         }
     } else {
         for (int y = 1; y < height - 1; y++) {
             g = q * f(0, width - 1) + c * f(0, width - 1);
             for (int x = width - 1; x >= 0; x--) {
                 f(y, x) = b0 * f(y, x) + b1 * f(y - 1, x) + g;
                 g = q * f(y, x) + c * f(y - 1, x);
             }
         }

         for (int y = height - 2; y >= 0; y--) {
             g = q * f(y, 0) + c * f(y, 0);
             for (int x = 0; x < width; x++) {
                 f(y, x) = b0 * f(y, x) + b1 * f(y + 1, x) + g;
                 g = q * f(y, x) + c * f(y + 1, x);
             }
         }
     }

     return 0;
 }

 static void diriir2d(AVFilterContext *ctx, int plane)
 {
     DBlurContext *s = ctx->priv;
     const int width = s->planewidth[plane];
     const int height = s->planeheight[plane];

     filter_horizontally(ctx, width, height);
 }

 static int query_formats(AVFilterContext *ctx)
 {
     static const enum AVPixelFormat pix_fmts[] = {
         AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
         AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
         AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
         AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
         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_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
         AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
         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_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
         AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
         AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
         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_NONE
     };

     return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
 }

 static int config_input(AVFilterLink *inlink)
 {
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
     DBlurContext *s = inlink->dst->priv;

     s->depth = desc->comp[0].depth;
     s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
     s->planewidth[0] = s->planewidth[3] = inlink->w;
     s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
     s->planeheight[0] = s->planeheight[3] = inlink->h;

     s->nb_planes = av_pix_fmt_count_planes(inlink->format);

     s->buffer = av_malloc_array(FFALIGN(inlink->w, 16), FFALIGN(inlink->h, 16) * sizeof(*s->buffer));
     if (!s->buffer)
         return AVERROR(ENOMEM);

     return 0;
 }

 static void set_params(DBlurContext *s, float angle, float r)
 {
     float mu, nu, R1, R2, w1, w2;
     float a0, a1, a2, a3;

     angle = angle * M_PI / 180.f;

     mu = cosf(angle);
     nu = sinf(angle);
     R1 = (mu * r) * (mu * r);
     R2 = (nu * r) * (nu * r);
     s->R3 = mu * nu * r * r;
     w1 = sqrtf(0.25f + R1);
     w2 = sqrtf(0.25f + R2);
     a0 = (w1 + 0.5f) * (w2 + 0.5f) - fabsf(s->R3);
     a1 = 0.5f + w2 - a0;
     a2 = 0.5f + w1 - a0;
     a3 = a0 - w1 - w2;
     s->b0 = 1.f / a0;
     s->b1 = -a2 / a0;
     s->q = -a1 / a0;
     s->c = -a3 / a0;
 }

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

     set_params(s, s->angle, s->radius);

     if (av_frame_is_writable(in)) {
         out = in;
     } else {
         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
         if (!out) {
             av_frame_free(&in);
             return AVERROR(ENOMEM);
         }
         av_frame_copy_props(out, in);
     }

     for (plane = 0; plane < s->nb_planes; plane++) {
         const int height = s->planeheight[plane];
         const int width = s->planewidth[plane];
         float *bptr = s->buffer;
         const uint8_t *src = in->data[plane];
         const uint16_t *src16 = (const uint16_t *)in->data[plane];
         uint8_t *dst = out->data[plane];
         uint16_t *dst16 = (uint16_t *)out->data[plane];
         int y, x;

         if (!(s->planes & (1 << plane))) {
             if (out != in)
                 av_image_copy_plane(out->data[plane], out->linesize[plane],
                                     in->data[plane], in->linesize[plane],
                                     width * ((s->depth + 7) / 8), height);
             continue;
         }

         if (s->depth == 8) {
             for (y = 0; y < height; y++) {
                 for (x = 0; x < width; x++) {
                     bptr[x] = src[x];
                 }
                 bptr += width;
                 src += in->linesize[plane];
             }
         } else {
             for (y = 0; y < height; y++) {
                 for (x = 0; x < width; x++) {
                     bptr[x] = src16[x];
                 }
                 bptr += width;
                 src16 += in->linesize[plane] / 2;
             }
         }

         diriir2d(ctx, plane);

         bptr = s->buffer;
         if (s->depth == 8) {
             for (y = 0; y < height; y++) {
                 for (x = 0; x < width; x++) {
                     dst[x] = bptr[x];
                 }
                 bptr += width;
                 dst += out->linesize[plane];
             }
         } else {
             for (y = 0; y < height; y++) {
                 for (x = 0; x < width; x++) {
                     dst16[x] = bptr[x];
                 }
                 bptr += width;
                 dst16 += out->linesize[plane] / 2;
             }
         }
     }

     if (out != in)
         av_frame_free(&in);
     return ff_filter_frame(outlink, out);
 }

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

     av_freep(&s->buffer);
 }

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

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

 AVFilter ff_vf_dblur = {
     .name          = "dblur",
     .description   = NULL_IF_CONFIG_SMALL("Apply Directional Blur filter."),
     .priv_size     = sizeof(DBlurContext),
     .priv_class    = &dblur_class,
     .uninit        = uninit,
     .query_formats = query_formats,
     .inputs        = dblur_inputs,
     .outputs       = dblur_outputs,
     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
     .process_command = ff_filter_process_command,
 };
	/*
	* Copyright (c) 2020 Paul B Mahol
	*
	* This file is part of FFmpeg.
	*
	* FFmpeg is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2.1 of the License, or (at your option) any later version.
	*
	* FFmpeg is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with FFmpeg; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#include "libavutil/imgutils.h"
	#include "libavutil/opt.h"
	#include "libavutil/pixdesc.h"
	#include "avfilter.h"
	#include "formats.h"
	#include "internal.h"
	#include "video.h"

	typedef struct DBlurContext {
	const AVClass *class;

	float angle;
	float radius;
	int planes;

	float b0, b1, q, c, R3;

	int depth;
	int planewidth[4];
	int planeheight[4];
	float *buffer;
	int nb_planes;
	void (horiz_slice)(float buffer, int width, int height, int steps, float nu, float bscale);
	} DBlurContext;

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

	static const AVOption dblur_options[] = {
	{ "angle", "set angle", OFFSET(angle), AV_OPT_TYPE_FLOAT, {.dbl=45}, 0.0, 360, FLAGS },
	{ "radius", "set radius", OFFSET(radius), AV_OPT_TYPE_FLOAT, {.dbl=5}, 1, 8192, FLAGS },
	{ "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=0xF}, 0, 0xF, FLAGS },
	{ NULL }
	};

	AVFILTER_DEFINE_CLASS(dblur);

	#define f(n, m) (dst[(n) * width + (m)])

	static int filter_horizontally(AVFilterContext *ctx, int width, int height)
	{
	DBlurContext *s = ctx->priv;
	const float b0 = s->b0;
	const float b1 = s->b1;
	const float q = s->q;
	const float c = s->c;
	float *dst = s->buffer;
	float g;

	if (s->R3 > 0) {
	for (int y = 1; y < height - 1; y++) {
	g = q * f(0, 0) + c * f(0, 0);
	for (int x = 0; x < width; x++) {
	f(y, x) = b0 * f(y, x) + b1 * f(y - 1, x) + g;
	g = q * f(y, x) + c * f(y - 1, x);
	}
	}

	for (int y = height - 2; y >= 0; y--) {
	g = q * f(y, width - 1) + c * f(y, width - 1);
	for (int x = width - 1; x >= 0; x--) {
	f(y, x) = b0 * f(y, x) + b1 * f(y + 1, x) + g;
	g = q * f(y, x) + c * f(y + 1, x);
	}
	}
	} else {
	for (int y = 1; y < height - 1; y++) {
	g = q * f(0, width - 1) + c * f(0, width - 1);
	for (int x = width - 1; x >= 0; x--) {
	f(y, x) = b0 * f(y, x) + b1 * f(y - 1, x) + g;
	g = q * f(y, x) + c * f(y - 1, x);
	}
	}

	for (int y = height - 2; y >= 0; y--) {
	g = q * f(y, 0) + c * f(y, 0);
	for (int x = 0; x < width; x++) {
	f(y, x) = b0 * f(y, x) + b1 * f(y + 1, x) + g;
	g = q * f(y, x) + c * f(y + 1, x);
	}
	}
	}

	return 0;
	}

	static void diriir2d(AVFilterContext *ctx, int plane)
	{
	DBlurContext *s = ctx->priv;
	const int width = s->planewidth[plane];
	const int height = s->planeheight[plane];

	filter_horizontally(ctx, width, height);
	}

	static int query_formats(AVFilterContext *ctx)
	{
	static const enum AVPixelFormat pix_fmts[] = {
	AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
	AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
	AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
	AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
	AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
	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_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
	AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
	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_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
	AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
	AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
	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_NONE
	};

	return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
	}

	static int config_input(AVFilterLink *inlink)
	{
	const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
	DBlurContext *s = inlink->dst->priv;

	s->depth = desc->comp[0].depth;
	s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
	s->planewidth[0] = s->planewidth[3] = inlink->w;
	s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
	s->planeheight[0] = s->planeheight[3] = inlink->h;

	s->nb_planes = av_pix_fmt_count_planes(inlink->format);

	s->buffer = av_malloc_array(FFALIGN(inlink->w, 16), FFALIGN(inlink->h, 16) * sizeof(*s->buffer));
	if (!s->buffer)
	return AVERROR(ENOMEM);

	return 0;
	}

	static void set_params(DBlurContext *s, float angle, float r)
	{
	float mu, nu, R1, R2, w1, w2;
	float a0, a1, a2, a3;

	angle = angle * M_PI / 180.f;

	mu = cosf(angle);
	nu = sinf(angle);
	R1 = (mu * r) * (mu * r);
	R2 = (nu * r) * (nu * r);
	s->R3 = mu * nu * r * r;
	w1 = sqrtf(0.25f + R1);
	w2 = sqrtf(0.25f + R2);
	a0 = (w1 + 0.5f) * (w2 + 0.5f) - fabsf(s->R3);
	a1 = 0.5f + w2 - a0;
	a2 = 0.5f + w1 - a0;
	a3 = a0 - w1 - w2;
	s->b0 = 1.f / a0;
	s->b1 = -a2 / a0;
	s->q = -a1 / a0;
	s->c = -a3 / a0;
	}

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

	set_params(s, s->angle, s->radius);

	if (av_frame_is_writable(in)) {
	out = in;
	} else {
	out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
	if (!out) {
	av_frame_free(&in);
	return AVERROR(ENOMEM);
	}
	av_frame_copy_props(out, in);
	}

	for (plane = 0; plane < s->nb_planes; plane++) {
	const int height = s->planeheight[plane];
	const int width = s->planewidth[plane];
	float *bptr = s->buffer;
	const uint8_t *src = in->data[plane];
	const uint16_t src16 = (const uint16_t )in->data[plane];
	uint8_t *dst = out->data[plane];
	uint16_t dst16 = (uint16_t )out->data[plane];
	int y, x;

	if (!(s->planes & (1 << plane))) {
	if (out != in)
	av_image_copy_plane(out->data[plane], out->linesize[plane],
	in->data[plane], in->linesize[plane],
	width * ((s->depth + 7) / 8), height);
	continue;
	}

	if (s->depth == 8) {
	for (y = 0; y < height; y++) {
	for (x = 0; x < width; x++) {
	bptr[x] = src[x];
	}
	bptr += width;
	src += in->linesize[plane];
	}
	} else {
	for (y = 0; y < height; y++) {
	for (x = 0; x < width; x++) {
	bptr[x] = src16[x];
	}
	bptr += width;
	src16 += in->linesize[plane] / 2;
	}
	}

	diriir2d(ctx, plane);

	bptr = s->buffer;
	if (s->depth == 8) {
	for (y = 0; y < height; y++) {
	for (x = 0; x < width; x++) {
	dst[x] = bptr[x];
	}
	bptr += width;
	dst += out->linesize[plane];
	}
	} else {
	for (y = 0; y < height; y++) {
	for (x = 0; x < width; x++) {
	dst16[x] = bptr[x];
	}
	bptr += width;
	dst16 += out->linesize[plane] / 2;
	}
	}
	}

	if (out != in)
	av_frame_free(&in);
	return ff_filter_frame(outlink, out);
	}

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

	av_freep(&s->buffer);
	}

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

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

	AVFilter ff_vf_dblur = {
	.name = "dblur",
	.description = NULL_IF_CONFIG_SMALL("Apply Directional Blur filter."),
	.priv_size = sizeof(DBlurContext),
	.priv_class = &dblur_class,
	.uninit = uninit,
	.query_formats = query_formats,
	.inputs = dblur_inputs,
	.outputs = dblur_outputs,
	.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
	.process_command = ff_filter_process_command,
	};