FFmpeg  4.3.6
af_anequalizer.c
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1 /*
2  * Copyright (c) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen and others
3  * Copyright (c) 2015 Paul B Mahol
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/avstring.h"
24 #include "libavutil/ffmath.h"
25 #include "libavutil/opt.h"
26 #include "libavutil/parseutils.h"
27 #include "avfilter.h"
28 #include "internal.h"
29 #include "audio.h"
30 
31 #define FILTER_ORDER 4
32 
33 enum FilterType {
38 };
39 
40 typedef struct FoSection {
41  double a0, a1, a2, a3, a4;
42  double b0, b1, b2, b3, b4;
43 
44  double num[4];
45  double denum[4];
46 } FoSection;
47 
48 typedef struct EqualizatorFilter {
49  int ignore;
50  int channel;
51  int type;
52 
53  double freq;
54  double gain;
55  double width;
56 
59 
60 typedef struct AudioNEqualizerContext {
61  const AVClass *class;
62  char *args;
63  char *colors;
65  int w, h;
66 
67  double mag;
68  int fscale;
74 
75 #define OFFSET(x) offsetof(AudioNEqualizerContext, x)
76 #define A AV_OPT_FLAG_AUDIO_PARAM
77 #define V AV_OPT_FLAG_VIDEO_PARAM
78 #define F AV_OPT_FLAG_FILTERING_PARAM
79 
80 static const AVOption anequalizer_options[] = {
81  { "params", NULL, OFFSET(args), AV_OPT_TYPE_STRING, {.str=""}, 0, 0, A|F },
82  { "curves", "draw frequency response curves", OFFSET(draw_curves), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, V|F },
83  { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "hd720"}, 0, 0, V|F },
84  { "mgain", "set max gain", OFFSET(mag), AV_OPT_TYPE_DOUBLE, {.dbl=60}, -900, 900, V|F },
85  { "fscale", "set frequency scale", OFFSET(fscale), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, V|F, "fscale" },
86  { "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, V|F, "fscale" },
87  { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, V|F, "fscale" },
88  { "colors", "set channels curves colors", OFFSET(colors), AV_OPT_TYPE_STRING, {.str = "red|green|blue|yellow|orange|lime|pink|magenta|brown" }, 0, 0, V|F },
89  { NULL }
90 };
91 
92 AVFILTER_DEFINE_CLASS(anequalizer);
93 
95 {
97  char *colors, *color, *saveptr = NULL;
98  int ch, i, n;
99 
100  colors = av_strdup(s->colors);
101  if (!colors)
102  return;
103 
104  memset(out->data[0], 0, s->h * out->linesize[0]);
105 
106  for (ch = 0; ch < inlink->channels; ch++) {
107  uint8_t fg[4] = { 0xff, 0xff, 0xff, 0xff };
108  int prev_v = -1;
109  double f;
110 
111  color = av_strtok(ch == 0 ? colors : NULL, " |", &saveptr);
112  if (color)
113  av_parse_color(fg, color, -1, ctx);
114 
115  for (f = 0; f < s->w; f++) {
116  double zr, zi, zr2, zi2;
117  double Hr, Hi;
118  double Hmag = 1;
119  double w;
120  int v, y, x;
121 
122  w = M_PI * (s->fscale ? pow(s->w - 1, f / s->w) : f) / (s->w - 1);
123  zr = cos(w);
124  zr2 = zr * zr;
125  zi = -sin(w);
126  zi2 = zi * zi;
127 
128  for (n = 0; n < s->nb_filters; n++) {
129  if (s->filters[n].channel != ch ||
130  s->filters[n].ignore)
131  continue;
132 
133  for (i = 0; i < FILTER_ORDER / 2; i++) {
134  FoSection *S = &s->filters[n].section[i];
135 
136  /* H *= (((((S->b4 * z + S->b3) * z + S->b2) * z + S->b1) * z + S->b0) /
137  ((((S->a4 * z + S->a3) * z + S->a2) * z + S->a1) * z + S->a0)); */
138 
139  Hr = S->b4*(1-8*zr2*zi2) + S->b2*(zr2-zi2) + zr*(S->b1+S->b3*(zr2-3*zi2))+ S->b0;
140  Hi = zi*(S->b3*(3*zr2-zi2) + S->b1 + 2*zr*(2*S->b4*(zr2-zi2) + S->b2));
141  Hmag *= hypot(Hr, Hi);
142  Hr = S->a4*(1-8*zr2*zi2) + S->a2*(zr2-zi2) + zr*(S->a1+S->a3*(zr2-3*zi2))+ S->a0;
143  Hi = zi*(S->a3*(3*zr2-zi2) + S->a1 + 2*zr*(2*S->a4*(zr2-zi2) + S->a2));
144  Hmag /= hypot(Hr, Hi);
145  }
146  }
147 
148  v = av_clip((1. + -20 * log10(Hmag) / s->mag) * s->h / 2, 0, s->h - 1);
149  x = lrint(f);
150  if (prev_v == -1)
151  prev_v = v;
152  if (v <= prev_v) {
153  for (y = v; y <= prev_v; y++)
154  AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg));
155  } else {
156  for (y = prev_v; y <= v; y++)
157  AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg));
158  }
159 
160  prev_v = v;
161  }
162  }
163 
164  av_free(colors);
165 }
166 
167 static int config_video(AVFilterLink *outlink)
168 {
169  AVFilterContext *ctx = outlink->src;
170  AudioNEqualizerContext *s = ctx->priv;
171  AVFilterLink *inlink = ctx->inputs[0];
172  AVFrame *out;
173 
174  outlink->w = s->w;
175  outlink->h = s->h;
176 
177  av_frame_free(&s->video);
178  s->video = out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
179  if (!out)
180  return AVERROR(ENOMEM);
181  outlink->sample_aspect_ratio = (AVRational){1,1};
182 
183  draw_curves(ctx, inlink, out);
184 
185  return 0;
186 }
187 
189 {
190  AudioNEqualizerContext *s = ctx->priv;
191  AVFilterPad pad, vpad;
192  int ret;
193 
194  pad = (AVFilterPad){
195  .name = av_strdup("out0"),
196  .type = AVMEDIA_TYPE_AUDIO,
197  };
198 
199  if (!pad.name)
200  return AVERROR(ENOMEM);
201 
202  ret = ff_insert_outpad(ctx, 0, &pad);
203  if (ret < 0) {
204  av_freep(&pad.name);
205  return ret;
206  }
207 
208  if (s->draw_curves) {
209  vpad = (AVFilterPad){
210  .name = av_strdup("out1"),
211  .type = AVMEDIA_TYPE_VIDEO,
212  .config_props = config_video,
213  };
214  if (!vpad.name) {
215  return AVERROR(ENOMEM);
216  }
217  ret = ff_insert_outpad(ctx, 1, &vpad);
218  if (ret < 0) {
219  av_freep(&vpad.name);
220  return ret;
221  }
222  }
223 
224  return 0;
225 }
226 
228 {
229  AVFilterLink *inlink = ctx->inputs[0];
230  AVFilterLink *outlink = ctx->outputs[0];
231  AudioNEqualizerContext *s = ctx->priv;
234  static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
235  static const enum AVSampleFormat sample_fmts[] = {
238  };
239  int ret;
240 
241  if (s->draw_curves) {
242  AVFilterLink *videolink = ctx->outputs[1];
243  formats = ff_make_format_list(pix_fmts);
244  if ((ret = ff_formats_ref(formats, &videolink->in_formats)) < 0)
245  return ret;
246  }
247 
248  formats = ff_make_format_list(sample_fmts);
249  if ((ret = ff_formats_ref(formats, &inlink->out_formats)) < 0 ||
250  (ret = ff_formats_ref(formats, &outlink->in_formats)) < 0)
251  return ret;
252 
253  layouts = ff_all_channel_counts();
254  if ((ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts)) < 0 ||
255  (ret = ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts)) < 0)
256  return ret;
257 
258  formats = ff_all_samplerates();
259  if ((ret = ff_formats_ref(formats, &inlink->out_samplerates)) < 0 ||
260  (ret = ff_formats_ref(formats, &outlink->in_samplerates)) < 0)
261  return ret;
262 
263  return 0;
264 }
265 
267 {
268  AudioNEqualizerContext *s = ctx->priv;
269 
270  for (int i = 0; i < ctx->nb_outputs; i++)
271  av_freep(&ctx->output_pads[i].name);
272  av_frame_free(&s->video);
273  av_freep(&s->filters);
274  s->nb_filters = 0;
275  s->nb_allocated = 0;
276 }
277 
278 static void butterworth_fo_section(FoSection *S, double beta,
279  double si, double g, double g0,
280  double D, double c0)
281 {
282  if (c0 == 1 || c0 == -1) {
283  S->b0 = (g*g*beta*beta + 2*g*g0*si*beta + g0*g0)/D;
284  S->b1 = 2*c0*(g*g*beta*beta - g0*g0)/D;
285  S->b2 = (g*g*beta*beta - 2*g0*g*beta*si + g0*g0)/D;
286  S->b3 = 0;
287  S->b4 = 0;
288 
289  S->a0 = 1;
290  S->a1 = 2*c0*(beta*beta - 1)/D;
291  S->a2 = (beta*beta - 2*beta*si + 1)/D;
292  S->a3 = 0;
293  S->a4 = 0;
294  } else {
295  S->b0 = (g*g*beta*beta + 2*g*g0*si*beta + g0*g0)/D;
296  S->b1 = -4*c0*(g0*g0 + g*g0*si*beta)/D;
297  S->b2 = 2*(g0*g0*(1 + 2*c0*c0) - g*g*beta*beta)/D;
298  S->b3 = -4*c0*(g0*g0 - g*g0*si*beta)/D;
299  S->b4 = (g*g*beta*beta - 2*g*g0*si*beta + g0*g0)/D;
300 
301  S->a0 = 1;
302  S->a1 = -4*c0*(1 + si*beta)/D;
303  S->a2 = 2*(1 + 2*c0*c0 - beta*beta)/D;
304  S->a3 = -4*c0*(1 - si*beta)/D;
305  S->a4 = (beta*beta - 2*si*beta + 1)/D;
306  }
307 }
308 
310  int N, double w0, double wb,
311  double G, double Gb, double G0)
312 {
313  double g, c0, g0, beta;
314  double epsilon;
315  int r = N % 2;
316  int L = (N - r) / 2;
317  int i;
318 
319  if (G == 0 && G0 == 0) {
320  f->section[0].a0 = 1;
321  f->section[0].b0 = 1;
322  f->section[1].a0 = 1;
323  f->section[1].b0 = 1;
324  return;
325  }
326 
327  G = ff_exp10(G/20);
328  Gb = ff_exp10(Gb/20);
329  G0 = ff_exp10(G0/20);
330 
331  epsilon = sqrt((G * G - Gb * Gb) / (Gb * Gb - G0 * G0));
332  g = pow(G, 1.0 / N);
333  g0 = pow(G0, 1.0 / N);
334  beta = pow(epsilon, -1.0 / N) * tan(wb/2);
335  c0 = cos(w0);
336 
337  for (i = 1; i <= L; i++) {
338  double ui = (2.0 * i - 1) / N;
339  double si = sin(M_PI * ui / 2.0);
340  double Di = beta * beta + 2 * si * beta + 1;
341 
342  butterworth_fo_section(&f->section[i - 1], beta, si, g, g0, Di, c0);
343  }
344 }
345 
346 static void chebyshev1_fo_section(FoSection *S, double a,
347  double c, double tetta_b,
348  double g0, double si, double b,
349  double D, double c0)
350 {
351  if (c0 == 1 || c0 == -1) {
352  S->b0 = (tetta_b*tetta_b*(b*b+g0*g0*c*c) + 2*g0*b*si*tetta_b*tetta_b + g0*g0)/D;
353  S->b1 = 2*c0*(tetta_b*tetta_b*(b*b+g0*g0*c*c) - g0*g0)/D;
354  S->b2 = (tetta_b*tetta_b*(b*b+g0*g0*c*c) - 2*g0*b*si*tetta_b + g0*g0)/D;
355  S->b3 = 0;
356  S->b4 = 0;
357 
358  S->a0 = 1;
359  S->a1 = 2*c0*(tetta_b*tetta_b*(a*a+c*c) - 1)/D;
360  S->a2 = (tetta_b*tetta_b*(a*a+c*c) - 2*a*si*tetta_b + 1)/D;
361  S->a3 = 0;
362  S->a4 = 0;
363  } else {
364  S->b0 = ((b*b + g0*g0*c*c)*tetta_b*tetta_b + 2*g0*b*si*tetta_b + g0*g0)/D;
365  S->b1 = -4*c0*(g0*g0 + g0*b*si*tetta_b)/D;
366  S->b2 = 2*(g0*g0*(1 + 2*c0*c0) - (b*b + g0*g0*c*c)*tetta_b*tetta_b)/D;
367  S->b3 = -4*c0*(g0*g0 - g0*b*si*tetta_b)/D;
368  S->b4 = ((b*b + g0*g0*c*c)*tetta_b*tetta_b - 2*g0*b*si*tetta_b + g0*g0)/D;
369 
370  S->a0 = 1;
371  S->a1 = -4*c0*(1 + a*si*tetta_b)/D;
372  S->a2 = 2*(1 + 2*c0*c0 - (a*a + c*c)*tetta_b*tetta_b)/D;
373  S->a3 = -4*c0*(1 - a*si*tetta_b)/D;
374  S->a4 = ((a*a + c*c)*tetta_b*tetta_b - 2*a*si*tetta_b + 1)/D;
375  }
376 }
377 
379  int N, double w0, double wb,
380  double G, double Gb, double G0)
381 {
382  double a, b, c0, g0, alfa, beta, tetta_b;
383  double epsilon;
384  int r = N % 2;
385  int L = (N - r) / 2;
386  int i;
387 
388  if (G == 0 && G0 == 0) {
389  f->section[0].a0 = 1;
390  f->section[0].b0 = 1;
391  f->section[1].a0 = 1;
392  f->section[1].b0 = 1;
393  return;
394  }
395 
396  G = ff_exp10(G/20);
397  Gb = ff_exp10(Gb/20);
398  G0 = ff_exp10(G0/20);
399 
400  epsilon = sqrt((G*G - Gb*Gb) / (Gb*Gb - G0*G0));
401  g0 = pow(G0,1.0/N);
402  alfa = pow(1.0/epsilon + sqrt(1 + 1/(epsilon*epsilon)), 1.0/N);
403  beta = pow(G/epsilon + Gb * sqrt(1 + 1/(epsilon*epsilon)), 1.0/N);
404  a = 0.5 * (alfa - 1.0/alfa);
405  b = 0.5 * (beta - g0*g0*(1/beta));
406  tetta_b = tan(wb/2);
407  c0 = cos(w0);
408 
409  for (i = 1; i <= L; i++) {
410  double ui = (2.0*i-1.0)/N;
411  double ci = cos(M_PI*ui/2.0);
412  double si = sin(M_PI*ui/2.0);
413  double Di = (a*a + ci*ci)*tetta_b*tetta_b + 2.0*a*si*tetta_b + 1;
414 
415  chebyshev1_fo_section(&f->section[i - 1], a, ci, tetta_b, g0, si, b, Di, c0);
416  }
417 }
418 
419 static void chebyshev2_fo_section(FoSection *S, double a,
420  double c, double tetta_b,
421  double g, double si, double b,
422  double D, double c0)
423 {
424  if (c0 == 1 || c0 == -1) {
425  S->b0 = (g*g*tetta_b*tetta_b + 2*tetta_b*g*b*si + b*b + g*g*c*c)/D;
426  S->b1 = 2*c0*(g*g*tetta_b*tetta_b - b*b - g*g*c*c)/D;
427  S->b2 = (g*g*tetta_b*tetta_b - 2*tetta_b*g*b*si + b*b + g*g*c*c)/D;
428  S->b3 = 0;
429  S->b4 = 0;
430 
431  S->a0 = 1;
432  S->a1 = 2*c0*(tetta_b*tetta_b - a*a - c*c)/D;
433  S->a2 = (tetta_b*tetta_b - 2*tetta_b*a*si + a*a + c*c)/D;
434  S->a3 = 0;
435  S->a4 = 0;
436  } else {
437  S->b0 = (g*g*tetta_b*tetta_b + 2*g*b*si*tetta_b + b*b + g*g*c*c)/D;
438  S->b1 = -4*c0*(b*b + g*g*c*c + g*b*si*tetta_b)/D;
439  S->b2 = 2*((b*b + g*g*c*c)*(1 + 2*c0*c0) - g*g*tetta_b*tetta_b)/D;
440  S->b3 = -4*c0*(b*b + g*g*c*c - g*b*si*tetta_b)/D;
441  S->b4 = (g*g*tetta_b*tetta_b - 2*g*b*si*tetta_b + b*b + g*g*c*c)/D;
442 
443  S->a0 = 1;
444  S->a1 = -4*c0*(a*a + c*c + a*si*tetta_b)/D;
445  S->a2 = 2*((a*a + c*c)*(1 + 2*c0*c0) - tetta_b*tetta_b)/D;
446  S->a3 = -4*c0*(a*a + c*c - a*si*tetta_b)/D;
447  S->a4 = (tetta_b*tetta_b - 2*a*si*tetta_b + a*a + c*c)/D;
448  }
449 }
450 
452  int N, double w0, double wb,
453  double G, double Gb, double G0)
454 {
455  double a, b, c0, tetta_b;
456  double epsilon, g, eu, ew;
457  int r = N % 2;
458  int L = (N - r) / 2;
459  int i;
460 
461  if (G == 0 && G0 == 0) {
462  f->section[0].a0 = 1;
463  f->section[0].b0 = 1;
464  f->section[1].a0 = 1;
465  f->section[1].b0 = 1;
466  return;
467  }
468 
469  G = ff_exp10(G/20);
470  Gb = ff_exp10(Gb/20);
471  G0 = ff_exp10(G0/20);
472 
473  epsilon = sqrt((G*G - Gb*Gb) / (Gb*Gb - G0*G0));
474  g = pow(G, 1.0 / N);
475  eu = pow(epsilon + sqrt(1 + epsilon*epsilon), 1.0/N);
476  ew = pow(G0*epsilon + Gb*sqrt(1 + epsilon*epsilon), 1.0/N);
477  a = (eu - 1.0/eu)/2.0;
478  b = (ew - g*g/ew)/2.0;
479  tetta_b = tan(wb/2);
480  c0 = cos(w0);
481 
482  for (i = 1; i <= L; i++) {
483  double ui = (2.0 * i - 1.0)/N;
484  double ci = cos(M_PI * ui / 2.0);
485  double si = sin(M_PI * ui / 2.0);
486  double Di = tetta_b*tetta_b + 2*a*si*tetta_b + a*a + ci*ci;
487 
488  chebyshev2_fo_section(&f->section[i - 1], a, ci, tetta_b, g, si, b, Di, c0);
489  }
490 }
491 
492 static double butterworth_compute_bw_gain_db(double gain)
493 {
494  double bw_gain = 0;
495 
496  if (gain <= -6)
497  bw_gain = gain + 3;
498  else if(gain > -6 && gain < 6)
499  bw_gain = gain * 0.5;
500  else if(gain >= 6)
501  bw_gain = gain - 3;
502 
503  return bw_gain;
504 }
505 
506 static double chebyshev1_compute_bw_gain_db(double gain)
507 {
508  double bw_gain = 0;
509 
510  if (gain <= -6)
511  bw_gain = gain + 1;
512  else if(gain > -6 && gain < 6)
513  bw_gain = gain * 0.9;
514  else if(gain >= 6)
515  bw_gain = gain - 1;
516 
517  return bw_gain;
518 }
519 
520 static double chebyshev2_compute_bw_gain_db(double gain)
521 {
522  double bw_gain = 0;
523 
524  if (gain <= -6)
525  bw_gain = -3;
526  else if(gain > -6 && gain < 6)
527  bw_gain = gain * 0.3;
528  else if(gain >= 6)
529  bw_gain = 3;
530 
531  return bw_gain;
532 }
533 
534 static inline double hz_2_rad(double x, double fs)
535 {
536  return 2 * M_PI * x / fs;
537 }
538 
540 {
541  double w0 = hz_2_rad(f->freq, sample_rate);
542  double wb = hz_2_rad(f->width, sample_rate);
543  double bw_gain;
544 
545  switch (f->type) {
546  case BUTTERWORTH:
547  bw_gain = butterworth_compute_bw_gain_db(f->gain);
548  butterworth_bp_filter(f, FILTER_ORDER, w0, wb, f->gain, bw_gain, 0);
549  break;
550  case CHEBYSHEV1:
551  bw_gain = chebyshev1_compute_bw_gain_db(f->gain);
552  chebyshev1_bp_filter(f, FILTER_ORDER, w0, wb, f->gain, bw_gain, 0);
553  break;
554  case CHEBYSHEV2:
555  bw_gain = chebyshev2_compute_bw_gain_db(f->gain);
556  chebyshev2_bp_filter(f, FILTER_ORDER, w0, wb, f->gain, bw_gain, 0);
557  break;
558  }
559 
560 }
561 
563 {
564  equalizer(&s->filters[s->nb_filters], inlink->sample_rate);
565  if (s->nb_filters >= s->nb_allocated - 1) {
567 
568  filters = av_calloc(s->nb_allocated, 2 * sizeof(*s->filters));
569  if (!filters)
570  return AVERROR(ENOMEM);
571  memcpy(filters, s->filters, sizeof(*s->filters) * s->nb_allocated);
572  av_free(s->filters);
573  s->filters = filters;
574  s->nb_allocated *= 2;
575  }
576  s->nb_filters++;
577 
578  return 0;
579 }
580 
581 static int config_input(AVFilterLink *inlink)
582 {
583  AVFilterContext *ctx = inlink->dst;
584  AudioNEqualizerContext *s = ctx->priv;
585  char *args = av_strdup(s->args);
586  char *saveptr = NULL;
587  int ret = 0;
588 
589  if (!args)
590  return AVERROR(ENOMEM);
591 
592  s->nb_allocated = 32 * inlink->channels;
593  s->filters = av_calloc(inlink->channels, 32 * sizeof(*s->filters));
594  if (!s->filters) {
595  s->nb_allocated = 0;
596  av_free(args);
597  return AVERROR(ENOMEM);
598  }
599 
600  while (1) {
601  char *arg = av_strtok(s->nb_filters == 0 ? args : NULL, "|", &saveptr);
602 
603  if (!arg)
604  break;
605 
606  s->filters[s->nb_filters].type = 0;
607  if (sscanf(arg, "c%d f=%lf w=%lf g=%lf t=%d", &s->filters[s->nb_filters].channel,
608  &s->filters[s->nb_filters].freq,
609  &s->filters[s->nb_filters].width,
610  &s->filters[s->nb_filters].gain,
611  &s->filters[s->nb_filters].type) != 5 &&
612  sscanf(arg, "c%d f=%lf w=%lf g=%lf", &s->filters[s->nb_filters].channel,
613  &s->filters[s->nb_filters].freq,
614  &s->filters[s->nb_filters].width,
615  &s->filters[s->nb_filters].gain) != 4 ) {
616  av_free(args);
617  return AVERROR(EINVAL);
618  }
619 
620  if (s->filters[s->nb_filters].freq < 0 ||
621  s->filters[s->nb_filters].freq > inlink->sample_rate / 2.0)
622  s->filters[s->nb_filters].ignore = 1;
623 
624  if (s->filters[s->nb_filters].channel < 0 ||
625  s->filters[s->nb_filters].channel >= inlink->channels)
626  s->filters[s->nb_filters].ignore = 1;
627 
628  s->filters[s->nb_filters].type = av_clip(s->filters[s->nb_filters].type, 0, NB_TYPES - 1);
629  ret = add_filter(s, inlink);
630  if (ret < 0)
631  break;
632  }
633 
634  av_free(args);
635 
636  return ret;
637 }
638 
639 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
640  char *res, int res_len, int flags)
641 {
642  AudioNEqualizerContext *s = ctx->priv;
643  AVFilterLink *inlink = ctx->inputs[0];
644  int ret = AVERROR(ENOSYS);
645 
646  if (!strcmp(cmd, "change")) {
647  double freq, width, gain;
648  int filter;
649 
650  if (sscanf(args, "%d|f=%lf|w=%lf|g=%lf", &filter, &freq, &width, &gain) != 4)
651  return AVERROR(EINVAL);
652 
653  if (filter < 0 || filter >= s->nb_filters)
654  return AVERROR(EINVAL);
655 
656  if (freq < 0 || freq > inlink->sample_rate / 2.0)
657  return AVERROR(EINVAL);
658 
659  s->filters[filter].freq = freq;
660  s->filters[filter].width = width;
661  s->filters[filter].gain = gain;
662  equalizer(&s->filters[filter], inlink->sample_rate);
663  if (s->draw_curves)
664  draw_curves(ctx, inlink, s->video);
665 
666  ret = 0;
667  }
668 
669  return ret;
670 }
671 
672 static inline double section_process(FoSection *S, double in)
673 {
674  double out;
675 
676  out = S->b0 * in;
677  out+= S->b1 * S->num[0] - S->denum[0] * S->a1;
678  out+= S->b2 * S->num[1] - S->denum[1] * S->a2;
679  out+= S->b3 * S->num[2] - S->denum[2] * S->a3;
680  out+= S->b4 * S->num[3] - S->denum[3] * S->a4;
681 
682  S->num[3] = S->num[2];
683  S->num[2] = S->num[1];
684  S->num[1] = S->num[0];
685  S->num[0] = in;
686 
687  S->denum[3] = S->denum[2];
688  S->denum[2] = S->denum[1];
689  S->denum[1] = S->denum[0];
690  S->denum[0] = out;
691 
692  return out;
693 }
694 
695 static double process_sample(FoSection *s1, double in)
696 {
697  double p0 = in, p1;
698  int i;
699 
700  for (i = 0; i < FILTER_ORDER / 2; i++) {
701  p1 = section_process(&s1[i], p0);
702  p0 = p1;
703  }
704 
705  return p1;
706 }
707 
708 static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
709 {
710  AVFilterContext *ctx = inlink->dst;
711  AudioNEqualizerContext *s = ctx->priv;
712  AVFilterLink *outlink = ctx->outputs[0];
713  double *bptr;
714  int i, n;
715 
716  for (i = 0; i < s->nb_filters; i++) {
717  EqualizatorFilter *f = &s->filters[i];
718 
719  if (f->gain == 0. || f->ignore)
720  continue;
721 
722  bptr = (double *)buf->extended_data[f->channel];
723  for (n = 0; n < buf->nb_samples; n++) {
724  double sample = bptr[n];
725 
726  sample = process_sample(f->section, sample);
727  bptr[n] = sample;
728  }
729  }
730 
731  if (s->draw_curves) {
732  AVFrame *clone;
733 
734  const int64_t pts = buf->pts +
735  av_rescale_q(buf->nb_samples, (AVRational){ 1, inlink->sample_rate },
736  outlink->time_base);
737  int ret;
738 
739  s->video->pts = pts;
740  clone = av_frame_clone(s->video);
741  if (!clone)
742  return AVERROR(ENOMEM);
743  ret = ff_filter_frame(ctx->outputs[1], clone);
744  if (ret < 0)
745  return ret;
746  }
747 
748  return ff_filter_frame(outlink, buf);
749 }
750 
751 static const AVFilterPad inputs[] = {
752  {
753  .name = "default",
754  .type = AVMEDIA_TYPE_AUDIO,
755  .config_props = config_input,
756  .filter_frame = filter_frame,
757  .needs_writable = 1,
758  },
759  { NULL }
760 };
761 
763  .name = "anequalizer",
764  .description = NULL_IF_CONFIG_SMALL("Apply high-order audio parametric multi band equalizer."),
765  .priv_size = sizeof(AudioNEqualizerContext),
766  .priv_class = &anequalizer_class,
767  .init = init,
768  .uninit = uninit,
770  .inputs = inputs,
771  .outputs = NULL,
774 };
#define NULL
Definition: coverity.c:32
static void chebyshev2_fo_section(FoSection *S, double a, double c, double tetta_b, double g, double si, double b, double D, double c0)
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
AVOption.
Definition: opt.h:246
static void chebyshev1_bp_filter(EqualizatorFilter *f, int N, double w0, double wb, double G, double Gb, double G0)
Main libavfilter public API header.
const char * g
Definition: vf_curves.c:115
static double butterworth_compute_bw_gain_db(double gain)
static int config_video(AVFilterLink *outlink)
const char * b
Definition: vf_curves.c:116
static void butterworth_bp_filter(EqualizatorFilter *f, int N, double w0, double wb, double G, double Gb, double G0)
double, planar
Definition: samplefmt.h:70
static void butterworth_fo_section(FoSection *S, double beta, double si, double g, double g0, double D, double c0)
FoSection section[2]
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:104
AVFILTER_DEFINE_CLASS(anequalizer)
#define sample
#define N
Definition: af_mcompand.c:54
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
Definition: mem.c:245
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:300
const char * name
Pad name.
Definition: internal.h:60
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:346
FilterType
int ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
Add *ref as a new reference to f.
Definition: formats.c:479
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1075
AVFilterPad * output_pads
array of output pads
Definition: avfilter.h:349
static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, int clip)
Definition: cfhd.c:196
uint8_t
#define av_cold
Definition: attributes.h:88
#define fs(width, name, subs,...)
Definition: cbs_vp9.c:259
AVOptions.
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
Definition: log.c:92
#define f(width, name)
Definition: cbs_vp9.c:255
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:393
static const AVOption anequalizer_options[]
static void chebyshev2_bp_filter(EqualizatorFilter *f, int N, double w0, double wb, double G, double Gb, double G0)
static void chebyshev1_fo_section(FoSection *S, double a, double c, double tetta_b, double g0, double si, double b, double D, double c0)
static double hz_2_rad(double x, double fs)
#define FILTER_ORDER
#define A
static av_cold void uninit(AVFilterContext *ctx)
#define AVFILTER_FLAG_DYNAMIC_OUTPUTS
The number of the filter outputs is not determined just by AVFilter.outputs.
Definition: avfilter.h:111
static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
int av_parse_color(uint8_t *rgba_color, const char *color_string, int slen, void *log_ctx)
Put the RGBA values that correspond to color_string in rgba_color.
Definition: parseutils.c:354
A filter pad used for either input or output.
Definition: internal.h:54
#define F
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
static av_always_inline double ff_exp10(double x)
Compute 10^x for floating point values.
Definition: ffmath.h:42
static int config_input(AVFilterLink *inlink)
#define S(s, c, i)
#define AVERROR(e)
Definition: error.h:43
static void equalizer(EqualizatorFilter *f, double sample_rate)
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
unsigned nb_outputs
number of output pads
Definition: avfilter.h:351
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
const char * r
Definition: vf_curves.c:114
void * priv
private data for use by the filter
Definition: avfilter.h:353
const char * arg
Definition: jacosubdec.c:66
#define V
static void draw_curves(AVFilterContext *ctx, AVFilterLink *inlink, AVFrame *out)
static int query_formats(AVFilterContext *ctx)
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
static av_const double hypot(double x, double y)
Definition: libm.h:366
#define width
int ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
Add *ref as a new reference to formats.
Definition: formats.c:484
uint8_t w
Definition: llviddspenc.c:38
AVFormatContext * ctx
Definition: movenc.c:48
#define s(width, name)
Definition: cbs_vp9.c:257
static const AVFilterPad inputs[]
#define AV_RL32
Definition: intreadwrite.h:146
#define L(x)
Definition: vp56_arith.h:36
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:541
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
static double process_sample(FoSection *s1, double in)
A list of supported channel layouts.
Definition: formats.h:85
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
sample_rate
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:253
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
static double chebyshev2_compute_bw_gain_db(double gain)
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:331
AVFilter ff_af_anequalizer
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) #define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac) { } void ff_audio_convert_free(AudioConvert **ac) { if(! *ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);} AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map) { AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method !=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2) { ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc) { av_free(ac);return NULL;} return ac;} in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar) { ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar ? ac->channels :1;} else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;} int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in) { int use_generic=1;int len=in->nb_samples;int p;if(ac->dc) { av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (dithered)\", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
Rational number (pair of numerator and denominator).
Definition: rational.h:58
const char * name
Filter name.
Definition: avfilter.h:148
static int add_filter(AudioNEqualizerContext *s, AVFilterLink *inlink)
#define s1
Definition: regdef.h:38
offset must point to two consecutive integers
Definition: opt.h:233
misc parsing utilities
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
enum MovChannelLayoutTag * layouts
Definition: mov_chan.c:434
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:275
AVFilterFormats * ff_all_samplerates(void)
Definition: formats.c:439
static int64_t pts
#define flags(name, subs,...)
Definition: cbs_av1.c:565
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
char * av_strtok(char *s, const char *delim, char **saveptr)
Split the string into several tokens which can be accessed by successive calls to av_strtok()...
Definition: avstring.c:184
static double section_process(FoSection *S, double in)
double denum[4]
internal math functions header
static double chebyshev1_compute_bw_gain_db(double gain)
#define G
Definition: huffyuvdsp.h:33
D(D(float, sse)
Definition: rematrix_init.c:28
static double c[64]
#define ui(width, name)
Definition: cbs_mpeg2.c:43
static av_cold int init(AVFilterContext *ctx)
#define OFFSET(x)
#define av_free(p)
static const struct PPFilter filters[]
Definition: postprocess.c:134
A list of supported formats for one end of a filter link.
Definition: formats.h:64
#define lrint
Definition: tablegen.h:53
An instance of a filter.
Definition: avfilter.h:338
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:731
FILE * out
Definition: movenc.c:54
#define av_freep(p)
#define M_PI
Definition: mathematics.h:52
formats
Definition: signature.h:48
EqualizatorFilter * filters
internal API functions
AVFilterChannelLayouts * ff_all_channel_counts(void)
Construct an AVFilterChannelLayouts coding for any channel layout, with known or unknown disposition...
Definition: formats.c:454
double num[4]
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:347
static int ff_insert_outpad(AVFilterContext *f, unsigned index, AVFilterPad *p)
Insert a new output pad for the filter.
Definition: internal.h:274
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:366
for(j=16;j >0;--j)
#define AV_WL32(p, v)
Definition: intreadwrite.h:426