1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
|
/*
* Copyright (c) 2015 Arwa Arif <arwaarif1994@gmail.com>
* Copyright (c) 2017 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
*/
/**
* @file
* FFT domain filtering.
*/
#include "libavfilter/internal.h"
#include "libavutil/common.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavcodec/avfft.h"
#include "libavutil/eval.h"
#define MAX_PLANES 4
enum EvalMode {
EVAL_MODE_INIT,
EVAL_MODE_FRAME,
EVAL_MODE_NB
};
typedef struct FFTFILTContext {
const AVClass *class;
int eval_mode;
int depth;
int nb_planes;
int planewidth[MAX_PLANES];
int planeheight[MAX_PLANES];
RDFTContext *hrdft[MAX_PLANES];
RDFTContext *vrdft[MAX_PLANES];
RDFTContext *ihrdft[MAX_PLANES];
RDFTContext *ivrdft[MAX_PLANES];
int rdft_hbits[MAX_PLANES];
int rdft_vbits[MAX_PLANES];
size_t rdft_hlen[MAX_PLANES];
size_t rdft_vlen[MAX_PLANES];
FFTSample *rdft_hdata[MAX_PLANES];
FFTSample *rdft_vdata[MAX_PLANES];
int dc[MAX_PLANES];
char *weight_str[MAX_PLANES];
AVExpr *weight_expr[MAX_PLANES];
double *weight[MAX_PLANES];
void (*rdft_horizontal)(struct FFTFILTContext *s, AVFrame *in, int w, int h, int plane);
void (*irdft_horizontal)(struct FFTFILTContext *s, AVFrame *out, int w, int h, int plane);
} FFTFILTContext;
static const char *const var_names[] = { "X", "Y", "W", "H", "N", NULL };
enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_N, VAR_VARS_NB };
enum { Y = 0, U, V };
#define OFFSET(x) offsetof(FFTFILTContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption fftfilt_options[] = {
{ "dc_Y", "adjust gain in Y plane", OFFSET(dc[Y]), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1000, FLAGS },
{ "dc_U", "adjust gain in U plane", OFFSET(dc[U]), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1000, FLAGS },
{ "dc_V", "adjust gain in V plane", OFFSET(dc[V]), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1000, FLAGS },
{ "weight_Y", "set luminance expression in Y plane", OFFSET(weight_str[Y]), AV_OPT_TYPE_STRING, {.str = "1"}, 0, 0, FLAGS },
{ "weight_U", "set chrominance expression in U plane", OFFSET(weight_str[U]), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
{ "weight_V", "set chrominance expression in V plane", OFFSET(weight_str[V]), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
{ "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
{ "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
{ "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
{NULL},
};
AVFILTER_DEFINE_CLASS(fftfilt);
static inline double lum(void *priv, double x, double y, int plane)
{
FFTFILTContext *s = priv;
return s->rdft_vdata[plane][(int)x * s->rdft_vlen[plane] + (int)y];
}
static double weight_Y(void *priv, double x, double y) { return lum(priv, x, y, Y); }
static double weight_U(void *priv, double x, double y) { return lum(priv, x, y, U); }
static double weight_V(void *priv, double x, double y) { return lum(priv, x, y, V); }
static void copy_rev (FFTSample *dest, int w, int w2)
{
int i;
for (i = w; i < w + (w2-w)/2; i++)
dest[i] = dest[2*w - i - 1];
for (; i < w2; i++)
dest[i] = dest[w2 - i];
}
/*Horizontal pass - RDFT*/
static void rdft_horizontal8(FFTFILTContext *s, AVFrame *in, int w, int h, int plane)
{
int i, j;
for (i = 0; i < h; i++) {
for (j = 0; j < w; j++)
s->rdft_hdata[plane][i * s->rdft_hlen[plane] + j] = *(in->data[plane] + in->linesize[plane] * i + j);
copy_rev(s->rdft_hdata[plane] + i * s->rdft_hlen[plane], w, s->rdft_hlen[plane]);
}
for (i = 0; i < h; i++)
av_rdft_calc(s->hrdft[plane], s->rdft_hdata[plane] + i * s->rdft_hlen[plane]);
}
static void rdft_horizontal16(FFTFILTContext *s, AVFrame *in, int w, int h, int plane)
{
const uint16_t *src = (const uint16_t *)in->data[plane];
int linesize = in->linesize[plane] / 2;
int i, j;
for (i = 0; i < h; i++) {
for (j = 0; j < w; j++)
s->rdft_hdata[plane][i * s->rdft_hlen[plane] + j] = *(src + linesize * i + j);
copy_rev(s->rdft_hdata[plane] + i * s->rdft_hlen[plane], w, s->rdft_hlen[plane]);
}
for (i = 0; i < h; i++)
av_rdft_calc(s->hrdft[plane], s->rdft_hdata[plane] + i * s->rdft_hlen[plane]);
}
/*Vertical pass - RDFT*/
static void rdft_vertical(FFTFILTContext *s, int h, int plane)
{
int i, j;
for (i = 0; i < s->rdft_hlen[plane]; i++) {
for (j = 0; j < h; j++)
s->rdft_vdata[plane][i * s->rdft_vlen[plane] + j] =
s->rdft_hdata[plane][j * s->rdft_hlen[plane] + i];
copy_rev(s->rdft_vdata[plane] + i * s->rdft_vlen[plane], h, s->rdft_vlen[plane]);
}
for (i = 0; i < s->rdft_hlen[plane]; i++)
av_rdft_calc(s->vrdft[plane], s->rdft_vdata[plane] + i * s->rdft_vlen[plane]);
}
/*Vertical pass - IRDFT*/
static void irdft_vertical(FFTFILTContext *s, int h, int plane)
{
int i, j;
for (i = 0; i < s->rdft_hlen[plane]; i++)
av_rdft_calc(s->ivrdft[plane], s->rdft_vdata[plane] + i * s->rdft_vlen[plane]);
for (i = 0; i < s->rdft_hlen[plane]; i++)
for (j = 0; j < h; j++)
s->rdft_hdata[plane][j * s->rdft_hlen[plane] + i] =
s->rdft_vdata[plane][i * s->rdft_vlen[plane] + j];
}
/*Horizontal pass - IRDFT*/
static void irdft_horizontal8(FFTFILTContext *s, AVFrame *out, int w, int h, int plane)
{
int i, j;
for (i = 0; i < h; i++)
av_rdft_calc(s->ihrdft[plane], s->rdft_hdata[plane] + i * s->rdft_hlen[plane]);
for (i = 0; i < h; i++)
for (j = 0; j < w; j++)
*(out->data[plane] + out->linesize[plane] * i + j) = av_clip(s->rdft_hdata[plane][i
*s->rdft_hlen[plane] + j] * 4 /
(s->rdft_hlen[plane] *
s->rdft_vlen[plane]), 0, 255);
}
static void irdft_horizontal16(FFTFILTContext *s, AVFrame *out, int w, int h, int plane)
{
uint16_t *dst = (uint16_t *)out->data[plane];
int linesize = out->linesize[plane] / 2;
int max = (1 << s->depth) - 1;
int i, j;
for (i = 0; i < h; i++)
av_rdft_calc(s->ihrdft[plane], s->rdft_hdata[plane] + i * s->rdft_hlen[plane]);
for (i = 0; i < h; i++)
for (j = 0; j < w; j++)
*(dst + linesize * i + j) = av_clip(s->rdft_hdata[plane][i
*s->rdft_hlen[plane] + j] * 4 /
(s->rdft_hlen[plane] *
s->rdft_vlen[plane]), 0, max);
}
static av_cold int initialize(AVFilterContext *ctx)
{
FFTFILTContext *s = ctx->priv;
int ret = 0, plane;
if (!s->dc[U] && !s->dc[V]) {
s->dc[U] = s->dc[Y];
s->dc[V] = s->dc[Y];
} else {
if (!s->dc[U]) s->dc[U] = s->dc[V];
if (!s->dc[V]) s->dc[V] = s->dc[U];
}
if (!s->weight_str[U] && !s->weight_str[V]) {
s->weight_str[U] = av_strdup(s->weight_str[Y]);
s->weight_str[V] = av_strdup(s->weight_str[Y]);
} else {
if (!s->weight_str[U]) s->weight_str[U] = av_strdup(s->weight_str[V]);
if (!s->weight_str[V]) s->weight_str[V] = av_strdup(s->weight_str[U]);
}
for (plane = 0; plane < 3; plane++) {
static double (*p[])(void *, double, double) = { weight_Y, weight_U, weight_V };
const char *const func2_names[] = {"weight_Y", "weight_U", "weight_V", NULL };
double (*func2[])(void *, double, double) = { weight_Y, weight_U, weight_V, p[plane], NULL };
ret = av_expr_parse(&s->weight_expr[plane], s->weight_str[plane], var_names,
NULL, NULL, func2_names, func2, 0, ctx);
if (ret < 0)
break;
}
return ret;
}
static void do_eval(FFTFILTContext *s, AVFilterLink *inlink, int plane)
{
double values[VAR_VARS_NB];
int i, j;
values[VAR_N] = inlink->frame_count_out;
values[VAR_W] = s->planewidth[plane];
values[VAR_H] = s->planeheight[plane];
for (i = 0; i < s->rdft_hlen[plane]; i++) {
values[VAR_X] = i;
for (j = 0; j < s->rdft_vlen[plane]; j++) {
values[VAR_Y] = j;
s->weight[plane][i * s->rdft_vlen[plane] + j] =
av_expr_eval(s->weight_expr[plane], values, s);
}
}
}
static int config_props(AVFilterLink *inlink)
{
FFTFILTContext *s = inlink->dst->priv;
const AVPixFmtDescriptor *desc;
int rdft_hbits, rdft_vbits, i, plane;
desc = av_pix_fmt_desc_get(inlink->format);
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);
for (i = 0; i < desc->nb_components; i++) {
int w = s->planewidth[i];
int h = s->planeheight[i];
/* RDFT - Array initialization for Horizontal pass*/
for (rdft_hbits = 1; 1 << rdft_hbits < w*10/9; rdft_hbits++);
s->rdft_hbits[i] = rdft_hbits;
s->rdft_hlen[i] = 1 << rdft_hbits;
if (!(s->rdft_hdata[i] = av_malloc_array(h, s->rdft_hlen[i] * sizeof(FFTSample))))
return AVERROR(ENOMEM);
if (!(s->hrdft[i] = av_rdft_init(s->rdft_hbits[i], DFT_R2C)))
return AVERROR(ENOMEM);
if (!(s->ihrdft[i] = av_rdft_init(s->rdft_hbits[i], IDFT_C2R)))
return AVERROR(ENOMEM);
/* RDFT - Array initialization for Vertical pass*/
for (rdft_vbits = 1; 1 << rdft_vbits < h*10/9; rdft_vbits++);
s->rdft_vbits[i] = rdft_vbits;
s->rdft_vlen[i] = 1 << rdft_vbits;
if (!(s->rdft_vdata[i] = av_malloc_array(s->rdft_hlen[i], s->rdft_vlen[i] * sizeof(FFTSample))))
return AVERROR(ENOMEM);
if (!(s->vrdft[i] = av_rdft_init(s->rdft_vbits[i], DFT_R2C)))
return AVERROR(ENOMEM);
if (!(s->ivrdft[i] = av_rdft_init(s->rdft_vbits[i], IDFT_C2R)))
return AVERROR(ENOMEM);
}
/*Luminance value - Array initialization*/
for (plane = 0; plane < 3; plane++) {
if(!(s->weight[plane] = av_malloc_array(s->rdft_hlen[plane], s->rdft_vlen[plane] * sizeof(double))))
return AVERROR(ENOMEM);
if (s->eval_mode == EVAL_MODE_INIT)
do_eval(s, inlink, plane);
}
if (s->depth <= 8) {
s->rdft_horizontal = rdft_horizontal8;
s->irdft_horizontal = irdft_horizontal8;
} else if (s->depth > 8) {
s->rdft_horizontal = rdft_horizontal16;
s->irdft_horizontal = irdft_horizontal16;
} else {
return AVERROR_BUG;
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = inlink->dst->outputs[0];
FFTFILTContext *s = ctx->priv;
AVFrame *out;
int i, j, plane;
out = ff_get_video_buffer(outlink, inlink->w, inlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
for (plane = 0; plane < s->nb_planes; plane++) {
int w = s->planewidth[plane];
int h = s->planeheight[plane];
if (s->eval_mode == EVAL_MODE_FRAME)
do_eval(s, inlink, plane);
s->rdft_horizontal(s, in, w, h, plane);
rdft_vertical(s, h, plane);
/*Change user defined parameters*/
for (i = 0; i < s->rdft_hlen[plane]; i++)
for (j = 0; j < s->rdft_vlen[plane]; j++)
s->rdft_vdata[plane][i * s->rdft_vlen[plane] + j] *=
s->weight[plane][i * s->rdft_vlen[plane] + j];
s->rdft_vdata[plane][0] += s->rdft_hlen[plane] * s->rdft_vlen[plane] * s->dc[plane];
irdft_vertical(s, h, plane);
s->irdft_horizontal(s, out, w, h, plane);
}
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static av_cold void uninit(AVFilterContext *ctx)
{
FFTFILTContext *s = ctx->priv;
int i;
for (i = 0; i < MAX_PLANES; i++) {
av_free(s->rdft_hdata[i]);
av_free(s->rdft_vdata[i]);
av_expr_free(s->weight_expr[i]);
av_free(s->weight[i]);
av_rdft_end(s->hrdft[i]);
av_rdft_end(s->ihrdft[i]);
av_rdft_end(s->vrdft[i]);
av_rdft_end(s->ivrdft[i]);
}
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pixel_fmts_fftfilt[] = {
AV_PIX_FMT_GRAY8,
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P,
AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV420P10,
AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV420P14,
AV_PIX_FMT_YUV420P16,
AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV422P10,
AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV422P14,
AV_PIX_FMT_YUV422P16,
AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV444P10,
AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV444P14,
AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_NONE
};
return ff_set_common_formats_from_list(ctx, pixel_fmts_fftfilt);
}
static const AVFilterPad fftfilt_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad fftfilt_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
const AVFilter ff_vf_fftfilt = {
.name = "fftfilt",
.description = NULL_IF_CONFIG_SMALL("Apply arbitrary expressions to pixels in frequency domain."),
.priv_size = sizeof(FFTFILTContext),
.priv_class = &fftfilt_class,
.inputs = fftfilt_inputs,
.outputs = fftfilt_outputs,
.query_formats = query_formats,
.init = initialize,
.uninit = uninit,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
|