1 /*
2 * Copyright (c) 2020 Paul B Mahol
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "libavutil/imgutils.h"
22 #include "libavutil/opt.h"
23 #include "libavutil/pixdesc.h"
24 #include "avfilter.h"
25 #include "formats.h"
26 #include "internal.h"
27 #include "video.h"
28
29 typedef struct DBlurContext {
30 const AVClass *class;
31
32 float angle;
33 float radius;
34 int planes;
35
36 float b0, b1, q, c, R3;
37
38 int depth;
39 int planewidth[4];
40 int planeheight[4];
41 float *buffer;
42 int nb_planes;
43 void (*horiz_slice)(float *buffer, int width, int height, int steps, float nu, float bscale);
44 } DBlurContext;
45
46 #define OFFSET(x) offsetof(DBlurContext, x)
47 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
48
49 static const AVOption dblur_options[] = {
50 { "angle", "set angle", OFFSET(angle), AV_OPT_TYPE_FLOAT, {.dbl=45}, 0.0, 360, FLAGS },
51 { "radius", "set radius", OFFSET(radius), AV_OPT_TYPE_FLOAT, {.dbl=5}, 1, 8192, FLAGS },
52 { "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=0xF}, 0, 0xF, FLAGS },
53 { NULL }
54 };
55
56 AVFILTER_DEFINE_CLASS(dblur);
57
58 #define f(n, m) (dst[(n) * width + (m)])
59
filter_horizontally(AVFilterContext * ctx,int width,int height)60 static int filter_horizontally(AVFilterContext *ctx, int width, int height)
61 {
62 DBlurContext *s = ctx->priv;
63 const float b0 = s->b0;
64 const float b1 = s->b1;
65 const float q = s->q;
66 const float c = s->c;
67 float *dst = s->buffer;
68 float g;
69
70 if (s->R3 > 0) {
71 for (int y = 1; y < height - 1; y++) {
72 g = q * f(0, 0) + c * f(0, 0);
73 for (int x = 0; x < width; x++) {
74 f(y, x) = b0 * f(y, x) + b1 * f(y - 1, x) + g;
75 g = q * f(y, x) + c * f(y - 1, x);
76 }
77 }
78
79 for (int y = height - 2; y >= 0; y--) {
80 g = q * f(y, width - 1) + c * f(y, width - 1);
81 for (int x = width - 1; x >= 0; x--) {
82 f(y, x) = b0 * f(y, x) + b1 * f(y + 1, x) + g;
83 g = q * f(y, x) + c * f(y + 1, x);
84 }
85 }
86 } else {
87 for (int y = 1; y < height - 1; y++) {
88 g = q * f(0, width - 1) + c * f(0, width - 1);
89 for (int x = width - 1; x >= 0; x--) {
90 f(y, x) = b0 * f(y, x) + b1 * f(y - 1, x) + g;
91 g = q * f(y, x) + c * f(y - 1, x);
92 }
93 }
94
95 for (int y = height - 2; y >= 0; y--) {
96 g = q * f(y, 0) + c * f(y, 0);
97 for (int x = 0; x < width; x++) {
98 f(y, x) = b0 * f(y, x) + b1 * f(y + 1, x) + g;
99 g = q * f(y, x) + c * f(y + 1, x);
100 }
101 }
102 }
103
104 return 0;
105 }
106
diriir2d(AVFilterContext * ctx,int plane)107 static void diriir2d(AVFilterContext *ctx, int plane)
108 {
109 DBlurContext *s = ctx->priv;
110 const int width = s->planewidth[plane];
111 const int height = s->planeheight[plane];
112
113 filter_horizontally(ctx, width, height);
114 }
115
query_formats(AVFilterContext * ctx)116 static int query_formats(AVFilterContext *ctx)
117 {
118 static const enum AVPixelFormat pix_fmts[] = {
119 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
120 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
121 AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
122 AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
123 AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
124 AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
125 AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
126 AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
127 AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
128 AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
129 AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
130 AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
131 AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
132 AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
133 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
134 AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
135 AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
136 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
137 AV_PIX_FMT_NONE
138 };
139
140 return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
141 }
142
config_input(AVFilterLink * inlink)143 static int config_input(AVFilterLink *inlink)
144 {
145 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
146 DBlurContext *s = inlink->dst->priv;
147
148 s->depth = desc->comp[0].depth;
149 s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
150 s->planewidth[0] = s->planewidth[3] = inlink->w;
151 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
152 s->planeheight[0] = s->planeheight[3] = inlink->h;
153
154 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
155
156 s->buffer = av_malloc_array(FFALIGN(inlink->w, 16), FFALIGN(inlink->h, 16) * sizeof(*s->buffer));
157 if (!s->buffer)
158 return AVERROR(ENOMEM);
159
160 return 0;
161 }
162
set_params(DBlurContext * s,float angle,float r)163 static void set_params(DBlurContext *s, float angle, float r)
164 {
165 float mu, nu, R1, R2, w1, w2;
166 float a0, a1, a2, a3;
167
168 angle = angle * M_PI / 180.f;
169
170 mu = cosf(angle);
171 nu = sinf(angle);
172 R1 = (mu * r) * (mu * r);
173 R2 = (nu * r) * (nu * r);
174 s->R3 = mu * nu * r * r;
175 w1 = sqrtf(0.25f + R1);
176 w2 = sqrtf(0.25f + R2);
177 a0 = (w1 + 0.5f) * (w2 + 0.5f) - fabsf(s->R3);
178 a1 = 0.5f + w2 - a0;
179 a2 = 0.5f + w1 - a0;
180 a3 = a0 - w1 - w2;
181 s->b0 = 1.f / a0;
182 s->b1 = -a2 / a0;
183 s->q = -a1 / a0;
184 s->c = -a3 / a0;
185 }
186
filter_frame(AVFilterLink * inlink,AVFrame * in)187 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
188 {
189 AVFilterContext *ctx = inlink->dst;
190 DBlurContext *s = ctx->priv;
191 AVFilterLink *outlink = ctx->outputs[0];
192 AVFrame *out;
193 int plane;
194
195 set_params(s, s->angle, s->radius);
196
197 if (av_frame_is_writable(in)) {
198 out = in;
199 } else {
200 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
201 if (!out) {
202 av_frame_free(&in);
203 return AVERROR(ENOMEM);
204 }
205 av_frame_copy_props(out, in);
206 }
207
208 for (plane = 0; plane < s->nb_planes; plane++) {
209 const int height = s->planeheight[plane];
210 const int width = s->planewidth[plane];
211 float *bptr = s->buffer;
212 const uint8_t *src = in->data[plane];
213 const uint16_t *src16 = (const uint16_t *)in->data[plane];
214 uint8_t *dst = out->data[plane];
215 uint16_t *dst16 = (uint16_t *)out->data[plane];
216 int y, x;
217
218 if (!(s->planes & (1 << plane))) {
219 if (out != in)
220 av_image_copy_plane(out->data[plane], out->linesize[plane],
221 in->data[plane], in->linesize[plane],
222 width * ((s->depth + 7) / 8), height);
223 continue;
224 }
225
226 if (s->depth == 8) {
227 for (y = 0; y < height; y++) {
228 for (x = 0; x < width; x++) {
229 bptr[x] = src[x];
230 }
231 bptr += width;
232 src += in->linesize[plane];
233 }
234 } else {
235 for (y = 0; y < height; y++) {
236 for (x = 0; x < width; x++) {
237 bptr[x] = src16[x];
238 }
239 bptr += width;
240 src16 += in->linesize[plane] / 2;
241 }
242 }
243
244 diriir2d(ctx, plane);
245
246 bptr = s->buffer;
247 if (s->depth == 8) {
248 for (y = 0; y < height; y++) {
249 for (x = 0; x < width; x++) {
250 dst[x] = bptr[x];
251 }
252 bptr += width;
253 dst += out->linesize[plane];
254 }
255 } else {
256 for (y = 0; y < height; y++) {
257 for (x = 0; x < width; x++) {
258 dst16[x] = bptr[x];
259 }
260 bptr += width;
261 dst16 += out->linesize[plane] / 2;
262 }
263 }
264 }
265
266 if (out != in)
267 av_frame_free(&in);
268 return ff_filter_frame(outlink, out);
269 }
270
uninit(AVFilterContext * ctx)271 static av_cold void uninit(AVFilterContext *ctx)
272 {
273 DBlurContext *s = ctx->priv;
274
275 av_freep(&s->buffer);
276 }
277
278 static const AVFilterPad dblur_inputs[] = {
279 {
280 .name = "default",
281 .type = AVMEDIA_TYPE_VIDEO,
282 .config_props = config_input,
283 .filter_frame = filter_frame,
284 },
285 { NULL }
286 };
287
288 static const AVFilterPad dblur_outputs[] = {
289 {
290 .name = "default",
291 .type = AVMEDIA_TYPE_VIDEO,
292 },
293 { NULL }
294 };
295
296 AVFilter ff_vf_dblur = {
297 .name = "dblur",
298 .description = NULL_IF_CONFIG_SMALL("Apply Directional Blur filter."),
299 .priv_size = sizeof(DBlurContext),
300 .priv_class = &dblur_class,
301 .uninit = uninit,
302 .query_formats = query_formats,
303 .inputs = dblur_inputs,
304 .outputs = dblur_outputs,
305 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
306 .process_command = ff_filter_process_command,
307 };
308