1 /*
2 * Copyright (c) 2018 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/intreadwrite.h"
23 #include "libavutil/opt.h"
24 #include "libavutil/pixdesc.h"
25
26 #include "avfilter.h"
27 #include "formats.h"
28 #include "internal.h"
29 #include "video.h"
30
31 typedef struct AmplifyContext {
32 const AVClass *class;
33 const AVPixFmtDescriptor *desc;
34 int radius;
35 float factor;
36 float threshold;
37 float tolerance;
38 int planes;
39
40 float llimit;
41 float hlimit;
42 int nb_inputs;
43 int nb_frames;
44
45 int depth;
46 int nb_planes;
47 int linesize[4];
48 int height[4];
49
50 AVFrame **frames;
51 } AmplifyContext;
52
53 static const enum AVPixelFormat pixel_fmts[] = {
54 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9,
55 AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
56 AV_PIX_FMT_GRAY16, AV_PIX_FMT_GRAYF32,
57 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
58 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
59 AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
60 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
61 AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
62 AV_PIX_FMT_YUVJ411P,
63 AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
64 AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
65 AV_PIX_FMT_YUV440P10,
66 AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
67 AV_PIX_FMT_YUV440P12,
68 AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
69 AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
70 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
71 AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
72 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
73 AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
74 AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16,
75 AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
76 AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
77 AV_PIX_FMT_GBRPF32, AV_PIX_FMT_GBRAPF32,
78 AV_PIX_FMT_NONE
79 };
80
init(AVFilterContext * ctx)81 static av_cold int init(AVFilterContext *ctx)
82 {
83 AmplifyContext *s = ctx->priv;
84
85 s->nb_inputs = s->radius * 2 + 1;
86
87 s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
88 if (!s->frames)
89 return AVERROR(ENOMEM);
90
91 return 0;
92 }
93
94 typedef struct ThreadData {
95 AVFrame **in, *out;
96 } ThreadData;
97
98 #define AMPLIFY_SLICE(type, stype, clip) \
99 const stype limit[2] = { s->llimit, s->hlimit }; \
100 \
101 for (int p = 0; p < s->nb_planes; p++) { \
102 const int slice_start = (s->height[p] * jobnr) / nb_jobs; \
103 const int slice_end = (s->height[p] * (jobnr+1)) / nb_jobs; \
104 type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]); \
105 ptrdiff_t dst_linesize = out->linesize[p] / sizeof(type); \
106 \
107 if (!((1 << p) & s->planes)) { \
108 av_image_copy_plane((uint8_t *)dst, out->linesize[p], \
109 in[radius]->data[p] + slice_start * in[radius]->linesize[p], \
110 in[radius]->linesize[p], \
111 s->linesize[p], slice_end - slice_start); \
112 continue; \
113 } \
114 \
115 for (int y = slice_start; y < slice_end; y++) { \
116 for (int x = 0; x < s->linesize[p] / sizeof(type); x++) { \
117 stype src = *(type *)(in[radius]->data[p] + y * in[radius]->linesize[p] + x * sizeof(type));\
118 float diff, abs_diff, avg; \
119 stype sum = 0; \
120 \
121 for (int i = 0; i < nb_inputs; i++) { \
122 sum += *(type *)(in[i]->data[p] + y * in[i]->linesize[p] + x * sizeof(type));\
123 } \
124 \
125 avg = sum * scale; \
126 diff = src - avg; \
127 abs_diff = fabsf(diff); \
128 \
129 if (abs_diff < threshold && abs_diff > tolerance) { \
130 float amp = copysignf(fminf(abs_diff * factor, limit[diff >= 0]), diff); \
131 dst[x] = clip(src + amp, depth); \
132 } else { \
133 dst[x] = src; \
134 } \
135 } \
136 \
137 dst += dst_linesize; \
138 } \
139 }
140
141 #define CLIP8(x, depth) av_clip_uint8(lrintf(x))
142 #define CLIP16(x, depth) av_clip_uintp2_c(lrintf(x), depth)
143 #define NOP(x, depth) (x)
144
amplify_frame(AVFilterContext * ctx,void * arg,int jobnr,int nb_jobs)145 static int amplify_frame(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
146 {
147 AmplifyContext *s = ctx->priv;
148 ThreadData *td = arg;
149 AVFrame **in = td->in;
150 AVFrame *out = td->out;
151 const int radius = s->radius;
152 const int nb_inputs = s->nb_inputs;
153 const float threshold = s->threshold;
154 const float tolerance = s->tolerance;
155 const float scale = 1.f / nb_inputs;
156 const float factor = s->factor;
157 const int depth = s->depth;
158
159 if (s->depth <= 8) {
160 AMPLIFY_SLICE(uint8_t, int, CLIP8)
161 } else if (s->depth <= 16) {
162 AMPLIFY_SLICE(uint16_t, int, CLIP16)
163 } else {
164 AMPLIFY_SLICE(float, float, NOP)
165 }
166
167 return 0;
168 }
169
config_output(AVFilterLink * outlink)170 static int config_output(AVFilterLink *outlink)
171 {
172 AVFilterContext *ctx = outlink->src;
173 AmplifyContext *s = ctx->priv;
174 AVFilterLink *inlink = ctx->inputs[0];
175 int ret;
176
177 s->desc = av_pix_fmt_desc_get(outlink->format);
178 if (!s->desc)
179 return AVERROR_BUG;
180 s->nb_planes = av_pix_fmt_count_planes(outlink->format);
181 s->depth = s->desc->comp[0].depth;
182
183 if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
184 return ret;
185
186 s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
187 s->height[0] = s->height[3] = inlink->h;
188
189 return 0;
190 }
191
uninit(AVFilterContext * ctx)192 static av_cold void uninit(AVFilterContext *ctx)
193 {
194 AmplifyContext *s = ctx->priv;
195 int i;
196
197 if (s->frames) {
198 for (i = 0; i < s->nb_frames; i++)
199 av_frame_free(&s->frames[i]);
200 }
201 av_freep(&s->frames);
202 }
203
filter_frame(AVFilterLink * inlink,AVFrame * in)204 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
205 {
206 AVFilterContext *ctx = inlink->dst;
207 AVFilterLink *outlink = ctx->outputs[0];
208 AmplifyContext *s = ctx->priv;
209 ThreadData td;
210 AVFrame *out;
211
212 if (s->nb_frames < s->nb_inputs) {
213 s->frames[s->nb_frames] = in;
214 s->nb_frames++;
215 return 0;
216 } else {
217 av_frame_free(&s->frames[0]);
218 memmove(&s->frames[0], &s->frames[1], sizeof(*s->frames) * (s->nb_inputs - 1));
219 s->frames[s->nb_inputs - 1] = in;
220 }
221
222 if (!ctx->is_disabled) {
223 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
224 if (!out)
225 return AVERROR(ENOMEM);
226 av_frame_copy_props(out, s->frames[0]);
227
228 td.out = out;
229 td.in = s->frames;
230 ff_filter_execute(ctx, amplify_frame, &td, NULL,
231 FFMIN(s->height[1], ff_filter_get_nb_threads(ctx)));
232 } else {
233 out = av_frame_clone(s->frames[s->radius]);
234 if (!out)
235 return AVERROR(ENOMEM);
236 out->pts = s->frames[0]->pts;
237 }
238
239 return ff_filter_frame(outlink, out);
240 }
241
242 #define OFFSET(x) offsetof(AmplifyContext, x)
243 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
244 #define VFT AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_RUNTIME_PARAM
245
246 static const AVOption amplify_options[] = {
247 { "radius", "set radius", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=2}, 1, 63, .flags = FLAGS },
248 { "factor", "set factor", OFFSET(factor), AV_OPT_TYPE_FLOAT, {.dbl=2}, 0, UINT16_MAX, .flags = VFT },
249 { "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_FLOAT, {.dbl=10}, 0, UINT16_MAX, .flags = VFT },
250 { "tolerance", "set tolerance", OFFSET(tolerance), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, UINT16_MAX, .flags = VFT },
251 { "low", "set low limit for amplification", OFFSET(llimit), AV_OPT_TYPE_FLOAT, {.dbl=UINT16_MAX}, 0, UINT16_MAX, .flags = VFT },
252 { "high", "set high limit for amplification", OFFSET(hlimit), AV_OPT_TYPE_FLOAT, {.dbl=UINT16_MAX}, 0, UINT16_MAX, .flags = VFT },
253 { "planes", "set what planes to filter", OFFSET(planes), AV_OPT_TYPE_FLAGS, {.i64=7}, 0, 15, VFT },
254 { NULL },
255 };
256
257 static const AVFilterPad inputs[] = {
258 {
259 .name = "default",
260 .type = AVMEDIA_TYPE_VIDEO,
261 .filter_frame = filter_frame,
262 },
263 };
264
265 static const AVFilterPad outputs[] = {
266 {
267 .name = "default",
268 .type = AVMEDIA_TYPE_VIDEO,
269 .config_props = config_output,
270 },
271 };
272
273 AVFILTER_DEFINE_CLASS(amplify);
274
275 const AVFilter ff_vf_amplify = {
276 .name = "amplify",
277 .description = NULL_IF_CONFIG_SMALL("Amplify changes between successive video frames."),
278 .priv_size = sizeof(AmplifyContext),
279 .priv_class = &lify_class,
280 FILTER_OUTPUTS(outputs),
281 FILTER_INPUTS(inputs),
282 FILTER_PIXFMTS_ARRAY(pixel_fmts),
283 .init = init,
284 .uninit = uninit,
285 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
286 .process_command = ff_filter_process_command,
287 };
288