2 * Copyright (c) 2015 Arwa Arif <arwaarif1994@gmail.com>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU Lesser General Public License as published
8 * by the Free Software Foundation; either version 2.1 of the License,
9 * or (at your option) any later version.
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.
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
23 * FFT domain filtering.
26 #include "libavfilter/internal.h"
27 #include "libavutil/common.h"
28 #include "libavutil/imgutils.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/pixdesc.h"
31 #include "libavcodec/avfft.h"
32 #include "libavutil/eval.h"
40 int rdft_hbits[MAX_PLANES];
41 int rdft_vbits[MAX_PLANES];
42 size_t rdft_hlen[MAX_PLANES];
43 size_t rdft_vlen[MAX_PLANES];
44 FFTSample *rdft_hdata[MAX_PLANES];
45 FFTSample *rdft_vdata[MAX_PLANES];
48 char *weight_str[MAX_PLANES];
49 AVExpr *weight_expr[MAX_PLANES];
50 double *weight[MAX_PLANES];
54 static const char *const var_names[] = { "X", "Y", "W", "H", NULL };
55 enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_VARS_NB };
59 #define OFFSET(x) offsetof(FFTFILTContext, x)
60 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
62 static const AVOption fftfilt_options[] = {
63 { "dc_Y", "adjust gain in Y plane", OFFSET(dc[Y]), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1000, FLAGS },
64 { "dc_U", "adjust gain in U plane", OFFSET(dc[U]), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1000, FLAGS },
65 { "dc_V", "adjust gain in V plane", OFFSET(dc[V]), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1000, FLAGS },
66 { "weight_Y", "set luminance expression in Y plane", OFFSET(weight_str[Y]), AV_OPT_TYPE_STRING, {.str = "1"}, CHAR_MIN, CHAR_MAX, FLAGS },
67 { "weight_U", "set chrominance expression in U plane", OFFSET(weight_str[U]), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
68 { "weight_V", "set chrominance expression in V plane", OFFSET(weight_str[V]), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
72 AVFILTER_DEFINE_CLASS(fftfilt);
74 static inline double lum(void *priv, double x, double y, int plane)
76 FFTFILTContext *fftfilt = priv;
77 return fftfilt->rdft_vdata[plane][(int)x * fftfilt->rdft_vlen[plane] + (int)y];
80 static double weight_Y(void *priv, double x, double y) { return lum(priv, x, y, Y); }
81 static double weight_U(void *priv, double x, double y) { return lum(priv, x, y, U); }
82 static double weight_V(void *priv, double x, double y) { return lum(priv, x, y, V); }
84 static void copy_rev (FFTSample *dest, int w, int w2)
88 for (i = w; i < w + (w2-w)/2; i++)
89 dest[i] = dest[2*w - i - 1];
92 dest[i] = dest[w2 - i];
95 /*Horizontal pass - RDFT*/
96 static void rdft_horizontal(FFTFILTContext *fftfilt, AVFrame *in, int w, int h, int plane)
99 fftfilt->rdft = av_rdft_init(fftfilt->rdft_hbits[plane], DFT_R2C);
101 for (i = 0; i < h; i++) {
102 for (j = 0; j < w; j++)
103 fftfilt->rdft_hdata[plane][i * fftfilt->rdft_hlen[plane] + j] = *(in->data[plane] + in->linesize[plane] * i + j);
105 copy_rev(fftfilt->rdft_hdata[plane] + i * fftfilt->rdft_hlen[plane], w, fftfilt->rdft_hlen[plane]);
108 for (i = 0; i < h; i++)
109 av_rdft_calc(fftfilt->rdft, fftfilt->rdft_hdata[plane] + i * fftfilt->rdft_hlen[plane]);
111 av_rdft_end(fftfilt->rdft);
114 /*Vertical pass - RDFT*/
115 static void rdft_vertical(FFTFILTContext *fftfilt, int h, int plane)
118 fftfilt->rdft = av_rdft_init(fftfilt->rdft_vbits[plane], DFT_R2C);
120 for (i = 0; i < fftfilt->rdft_hlen[plane]; i++) {
121 for (j = 0; j < h; j++)
122 fftfilt->rdft_vdata[plane][i * fftfilt->rdft_vlen[plane] + j] =
123 fftfilt->rdft_hdata[plane][j * fftfilt->rdft_hlen[plane] + i];
124 copy_rev(fftfilt->rdft_vdata[plane] + i * fftfilt->rdft_vlen[plane], h, fftfilt->rdft_vlen[plane]);
127 for (i = 0; i < fftfilt->rdft_hlen[plane]; i++)
128 av_rdft_calc(fftfilt->rdft, fftfilt->rdft_vdata[plane] + i * fftfilt->rdft_vlen[plane]);
130 av_rdft_end(fftfilt->rdft);
132 /*Vertical pass - IRDFT*/
133 static void irdft_vertical(FFTFILTContext *fftfilt, int h, int plane)
136 fftfilt->rdft = av_rdft_init(fftfilt->rdft_vbits[plane], IDFT_C2R);
137 for (i = 0; i < fftfilt->rdft_hlen[plane]; i++)
138 av_rdft_calc(fftfilt->rdft, fftfilt->rdft_vdata[plane] + i * fftfilt->rdft_vlen[plane]);
140 for (i = 0; i < fftfilt->rdft_hlen[plane]; i++)
141 for (j = 0; j < h; j++)
142 fftfilt->rdft_hdata[plane][j * fftfilt->rdft_hlen[plane] + i] =
143 fftfilt->rdft_vdata[plane][i * fftfilt->rdft_vlen[plane] + j];
145 av_rdft_end(fftfilt->rdft);
148 /*Horizontal pass - IRDFT*/
149 static void irdft_horizontal(FFTFILTContext *fftfilt, AVFrame *out, int w, int h, int plane)
152 fftfilt->rdft = av_rdft_init(fftfilt->rdft_hbits[plane], IDFT_C2R);
153 for (i = 0; i < h; i++)
154 av_rdft_calc(fftfilt->rdft, fftfilt->rdft_hdata[plane] + i * fftfilt->rdft_hlen[plane]);
156 for (i = 0; i < h; i++)
157 for (j = 0; j < w; j++)
158 *(out->data[plane] + out->linesize[plane] * i + j) = av_clip(fftfilt->rdft_hdata[plane][i
159 *fftfilt->rdft_hlen[plane] + j] * 4 /
160 (fftfilt->rdft_hlen[plane] *
161 fftfilt->rdft_vlen[plane]), 0, 255);
163 av_rdft_end(fftfilt->rdft);
166 static av_cold int initialize(AVFilterContext *ctx)
168 FFTFILTContext *fftfilt = ctx->priv;
171 if (!fftfilt->dc[U] && !fftfilt->dc[V]) {
172 fftfilt->dc[U] = fftfilt->dc[Y];
173 fftfilt->dc[V] = fftfilt->dc[Y];
175 if (!fftfilt->dc[U]) fftfilt->dc[U] = fftfilt->dc[V];
176 if (!fftfilt->dc[V]) fftfilt->dc[V] = fftfilt->dc[U];
179 if (!fftfilt->weight_str[U] && !fftfilt->weight_str[V]) {
180 fftfilt->weight_str[U] = av_strdup(fftfilt->weight_str[Y]);
181 fftfilt->weight_str[V] = av_strdup(fftfilt->weight_str[Y]);
183 if (!fftfilt->weight_str[U]) fftfilt->weight_str[U] = av_strdup(fftfilt->weight_str[V]);
184 if (!fftfilt->weight_str[V]) fftfilt->weight_str[V] = av_strdup(fftfilt->weight_str[U]);
187 for (plane = 0; plane < 3; plane++) {
188 static double (*p[])(void *, double, double) = { weight_Y, weight_U, weight_V };
189 const char *const func2_names[] = {"weight_Y", "weight_U", "weight_V", NULL };
190 double (*func2[])(void *, double, double) = { weight_Y, weight_U, weight_V, p[plane], NULL };
192 ret = av_expr_parse(&fftfilt->weight_expr[plane], fftfilt->weight_str[plane], var_names,
193 NULL, NULL, func2_names, func2, 0, ctx);
200 static int config_props(AVFilterLink *inlink)
202 FFTFILTContext *fftfilt = inlink->dst->priv;
203 const AVPixFmtDescriptor *desc;
204 int rdft_hbits, rdft_vbits, i, j, plane;
205 double values[VAR_VARS_NB];
207 desc = av_pix_fmt_desc_get(inlink->format);
208 for (i = 0; i < desc->nb_components; i++) {
212 /* RDFT - Array initialization for Horizontal pass*/
213 for (rdft_hbits = 1; 1 << rdft_hbits < w*10/9; rdft_hbits++);
214 fftfilt->rdft_hbits[i] = rdft_hbits;
215 fftfilt->rdft_hlen[i] = 1 << rdft_hbits;
216 if (!(fftfilt->rdft_hdata[i] = av_malloc_array(h, fftfilt->rdft_hlen[i] * sizeof(FFTSample))))
217 return AVERROR(ENOMEM);
219 /* RDFT - Array initialization for Vertical pass*/
220 for (rdft_vbits = 1; 1 << rdft_vbits < h*10/9; rdft_vbits++);
221 fftfilt->rdft_vbits[i] = rdft_vbits;
222 fftfilt->rdft_vlen[i] = 1 << rdft_vbits;
223 if (!(fftfilt->rdft_vdata[i] = av_malloc_array(fftfilt->rdft_hlen[i], fftfilt->rdft_vlen[i] * sizeof(FFTSample))))
224 return AVERROR(ENOMEM);
227 /*Luminance value - Array initialization*/
228 values[VAR_W] = inlink->w;
229 values[VAR_H] = inlink->h;
230 for (plane = 0; plane < 3; plane++)
232 if(!(fftfilt->weight[plane] = av_malloc_array(fftfilt->rdft_hlen[plane], fftfilt->rdft_vlen[plane] * sizeof(double))))
233 return AVERROR(ENOMEM);
234 for (i = 0; i < fftfilt->rdft_hlen[plane]; i++)
237 for (j = 0; j < fftfilt->rdft_vlen[plane]; j++)
240 fftfilt->weight[plane][i * fftfilt->rdft_vlen[plane] + j] =
241 av_expr_eval(fftfilt->weight_expr[plane], values, fftfilt);
248 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
250 AVFilterContext *ctx = inlink->dst;
251 AVFilterLink *outlink = inlink->dst->outputs[0];
252 const AVPixFmtDescriptor *desc;
253 FFTFILTContext *fftfilt = ctx->priv;
257 out = ff_get_video_buffer(outlink, inlink->w, inlink->h);
259 return AVERROR(ENOMEM);
261 av_frame_copy_props(out, in);
263 desc = av_pix_fmt_desc_get(inlink->format);
264 for (plane = 0; plane < desc->nb_components; plane++) {
268 if (plane == 1 || plane == 2) {
269 w = FF_CEIL_RSHIFT(w, desc->log2_chroma_w);
270 h = FF_CEIL_RSHIFT(h, desc->log2_chroma_h);
273 rdft_horizontal(fftfilt, in, w, h, plane);
274 rdft_vertical(fftfilt, h, plane);
276 /*Change user defined parameters*/
277 for (i = 0; i < fftfilt->rdft_hlen[plane]; i++)
278 for (j = 0; j < fftfilt->rdft_vlen[plane]; j++)
279 fftfilt->rdft_vdata[plane][i * fftfilt->rdft_vlen[plane] + j] *=
280 fftfilt->weight[plane][i * fftfilt->rdft_vlen[plane] + j];
282 fftfilt->rdft_vdata[plane][0] += fftfilt->rdft_hlen[plane] * fftfilt->rdft_vlen[plane] * fftfilt->dc[plane];
284 irdft_vertical(fftfilt, h, plane);
285 irdft_horizontal(fftfilt, out, w, h, plane);
289 return ff_filter_frame(outlink, out);
292 static av_cold void uninit(AVFilterContext *ctx)
294 FFTFILTContext *fftfilt = ctx->priv;
296 for (i = 0; i < MAX_PLANES; i++) {
297 av_free(fftfilt->rdft_hdata[i]);
298 av_free(fftfilt->rdft_vdata[i]);
299 av_expr_free(fftfilt->weight_expr[i]);
300 av_free(fftfilt->weight[i]);
304 static int query_formats(AVFilterContext *ctx)
306 static const enum AVPixelFormat pixel_fmts_fftfilt[] = {
312 AVFilterFormats *fmts_list = ff_make_format_list(pixel_fmts_fftfilt);
314 return AVERROR(ENOMEM);
315 return ff_set_common_formats(ctx, fmts_list);
318 static const AVFilterPad fftfilt_inputs[] = {
321 .type = AVMEDIA_TYPE_VIDEO,
322 .config_props = config_props,
323 .filter_frame = filter_frame,
328 static const AVFilterPad fftfilt_outputs[] = {
331 .type = AVMEDIA_TYPE_VIDEO,
336 AVFilter ff_vf_fftfilt = {
338 .description = NULL_IF_CONFIG_SMALL("Apply arbitrary expressions to samples in frequency domain"),
339 .priv_size = sizeof(FFTFILTContext),
340 .priv_class = &fftfilt_class,
341 .inputs = fftfilt_inputs,
342 .outputs = fftfilt_outputs,
343 .query_formats = query_formats,