FFmpeg
af_biquads.c
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1 /*
2  * Copyright (c) 2013 Paul B Mahol
3  * Copyright (c) 2006-2008 Rob Sykes <robs@users.sourceforge.net>
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 /*
23  * 2-pole filters designed by Robert Bristow-Johnson <rbj@audioimagination.com>
24  * see http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt
25  *
26  * 1-pole filters based on code (c) 2000 Chris Bagwell <cbagwell@sprynet.com>
27  * Algorithms: Recursive single pole low/high pass filter
28  * Reference: The Scientist and Engineer's Guide to Digital Signal Processing
29  *
30  * low-pass: output[N] = input[N] * A + output[N-1] * B
31  * X = exp(-2.0 * pi * Fc)
32  * A = 1 - X
33  * B = X
34  * Fc = cutoff freq / sample rate
35  *
36  * Mimics an RC low-pass filter:
37  *
38  * ---/\/\/\/\----------->
39  * |
40  * --- C
41  * ---
42  * |
43  * |
44  * V
45  *
46  * high-pass: output[N] = A0 * input[N] + A1 * input[N-1] + B1 * output[N-1]
47  * X = exp(-2.0 * pi * Fc)
48  * A0 = (1 + X) / 2
49  * A1 = -(1 + X) / 2
50  * B1 = X
51  * Fc = cutoff freq / sample rate
52  *
53  * Mimics an RC high-pass filter:
54  *
55  * || C
56  * ----||--------->
57  * || |
58  * <
59  * > R
60  * <
61  * |
62  * V
63  */
64 
65 #include "libavutil/avassert.h"
66 #include "libavutil/ffmath.h"
67 #include "libavutil/opt.h"
68 #include "audio.h"
69 #include "avfilter.h"
70 #include "internal.h"
71 
72 enum FilterType {
73  biquad,
74  equalizer,
75  bass,
76  treble,
77  bandpass,
78  bandreject,
79  allpass,
80  highpass,
81  lowpass,
82  lowshelf,
83  highshelf,
84 };
85 
86 enum WidthType {
87  NONE,
88  HERTZ,
89  OCTAVE,
90  QFACTOR,
91  SLOPE,
92  KHERTZ,
93  NB_WTYPE,
94 };
95 
96 enum TransformType {
97  DI,
98  DII,
99  TDII,
100  NB_TTYPE,
101 };
102 
103 typedef struct ChanCache {
104  double i1, i2;
105  double o1, o2;
106  int clippings;
107 } ChanCache;
108 
109 typedef struct BiquadsContext {
110  const AVClass *class;
111 
112  enum FilterType filter_type;
113  int width_type;
114  int poles;
115  int csg;
116  int transform_type;
117 
118  double gain;
119  double frequency;
120  double width;
121  double mix;
122  uint64_t channels;
123  int normalize;
124  int order;
125 
126  double a0, a1, a2;
127  double b0, b1, b2;
128 
129  ChanCache *cache;
130  int block_align;
131 
132  void (*filter)(struct BiquadsContext *s, const void *ibuf, void *obuf, int len,
133  double *i1, double *i2, double *o1, double *o2,
134  double b0, double b1, double b2, double a1, double a2, int *clippings,
135  int disabled);
136 } BiquadsContext;
137 
138 static av_cold int init(AVFilterContext *ctx)
139 {
140  BiquadsContext *s = ctx->priv;
141 
142  if (s->filter_type != biquad) {
143  if (s->frequency <= 0 || s->width <= 0) {
144  av_log(ctx, AV_LOG_ERROR, "Invalid frequency %f and/or width %f <= 0\n",
145  s->frequency, s->width);
146  return AVERROR(EINVAL);
147  }
148  }
149 
150  return 0;
151 }
152 
153 static int query_formats(AVFilterContext *ctx)
154 {
155  AVFilterFormats *formats;
156  AVFilterChannelLayouts *layouts;
157  static const enum AVSampleFormat sample_fmts[] = {
158  AV_SAMPLE_FMT_S16P,
159  AV_SAMPLE_FMT_S32P,
160  AV_SAMPLE_FMT_FLTP,
161  AV_SAMPLE_FMT_DBLP,
162  AV_SAMPLE_FMT_NONE
163  };
164  int ret;
165 
166  layouts = ff_all_channel_counts();
167  if (!layouts)
168  return AVERROR(ENOMEM);
169  ret = ff_set_common_channel_layouts(ctx, layouts);
170  if (ret < 0)
171  return ret;
172 
173  formats = ff_make_format_list(sample_fmts);
174  if (!formats)
175  return AVERROR(ENOMEM);
176  ret = ff_set_common_formats(ctx, formats);
177  if (ret < 0)
178  return ret;
179 
180  formats = ff_all_samplerates();
181  if (!formats)
182  return AVERROR(ENOMEM);
183  return ff_set_common_samplerates(ctx, formats);
184 }
185 
186 #define BIQUAD_FILTER(name, type, min, max, need_clipping) \
187 static void biquad_## name (BiquadsContext *s, \
188  const void *input, void *output, int len, \
189  double *in1, double *in2, \
190  double *out1, double *out2, \
191  double b0, double b1, double b2, \
192  double a1, double a2, int *clippings, \
193  int disabled) \
194 { \
195  const type *ibuf = input; \
196  type *obuf = output; \
197  double i1 = *in1; \
198  double i2 = *in2; \
199  double o1 = *out1; \
200  double o2 = *out2; \
201  double wet = s->mix; \
202  double dry = 1. - wet; \
203  double out; \
204  int i; \
205  a1 = -a1; \
206  a2 = -a2; \
207  \
208  for (i = 0; i+1 < len; i++) { \
209  o2 = i2 * b2 + i1 * b1 + ibuf[i] * b0 + o2 * a2 + o1 * a1; \
210  i2 = ibuf[i]; \
211  out = o2 * wet + i2 * dry; \
212  if (disabled) { \
213  obuf[i] = i2; \
214  } else if (need_clipping && out < min) { \
215  (*clippings)++; \
216  obuf[i] = min; \
217  } else if (need_clipping && out > max) { \
218  (*clippings)++; \
219  obuf[i] = max; \
220  } else { \
221  obuf[i] = out; \
222  } \
223  i++; \
224  o1 = i1 * b2 + i2 * b1 + ibuf[i] * b0 + o1 * a2 + o2 * a1; \
225  i1 = ibuf[i]; \
226  out = o1 * wet + i1 * dry; \
227  if (disabled) { \
228  obuf[i] = i1; \
229  } else if (need_clipping && out < min) { \
230  (*clippings)++; \
231  obuf[i] = min; \
232  } else if (need_clipping && out > max) { \
233  (*clippings)++; \
234  obuf[i] = max; \
235  } else { \
236  obuf[i] = out; \
237  } \
238  } \
239  if (i < len) { \
240  double o0 = ibuf[i] * b0 + i1 * b1 + i2 * b2 + o1 * a1 + o2 * a2; \
241  i2 = i1; \
242  i1 = ibuf[i]; \
243  o2 = o1; \
244  o1 = o0; \
245  out = o0 * wet + i1 * dry; \
246  if (disabled) { \
247  obuf[i] = i1; \
248  } else if (need_clipping && out < min) { \
249  (*clippings)++; \
250  obuf[i] = min; \
251  } else if (need_clipping && out > max) { \
252  (*clippings)++; \
253  obuf[i] = max; \
254  } else { \
255  obuf[i] = out; \
256  } \
257  } \
258  *in1 = i1; \
259  *in2 = i2; \
260  *out1 = o1; \
261  *out2 = o2; \
262 }
263 
264 BIQUAD_FILTER(s16, int16_t, INT16_MIN, INT16_MAX, 1)
265 BIQUAD_FILTER(s32, int32_t, INT32_MIN, INT32_MAX, 1)
266 BIQUAD_FILTER(flt, float, -1., 1., 0)
267 BIQUAD_FILTER(dbl, double, -1., 1., 0)
268 
269 #define BIQUAD_DII_FILTER(name, type, min, max, need_clipping) \
270 static void biquad_dii_## name (BiquadsContext *s, \
271  const void *input, void *output, int len, \
272  double *z1, double *z2, \
273  double *unused1, double *unused2, \
274  double b0, double b1, double b2, \
275  double a1, double a2, int *clippings, \
276  int disabled) \
277 { \
278  const type *ibuf = input; \
279  type *obuf = output; \
280  double w1 = *z1; \
281  double w2 = *z2; \
282  double wet = s->mix; \
283  double dry = 1. - wet; \
284  double in, out, w0; \
285  \
286  a1 = -a1; \
287  a2 = -a2; \
288  \
289  for (int i = 0; i < len; i++) { \
290  in = ibuf[i]; \
291  w0 = in + a1 * w1 + a2 * w2; \
292  out = b0 * w0 + b1 * w1 + b2 * w2; \
293  w2 = w1; \
294  w1 = w0; \
295  out = out * wet + in * dry; \
296  if (disabled) { \
297  obuf[i] = in; \
298  } else if (need_clipping && out < min) { \
299  (*clippings)++; \
300  obuf[i] = min; \
301  } else if (need_clipping && out > max) { \
302  (*clippings)++; \
303  obuf[i] = max; \
304  } else { \
305  obuf[i] = out; \
306  } \
307  } \
308  *z1 = w1; \
309  *z2 = w2; \
310 }
311 
312 BIQUAD_DII_FILTER(s16, int16_t, INT16_MIN, INT16_MAX, 1)
313 BIQUAD_DII_FILTER(s32, int32_t, INT32_MIN, INT32_MAX, 1)
314 BIQUAD_DII_FILTER(flt, float, -1., 1., 0)
315 BIQUAD_DII_FILTER(dbl, double, -1., 1., 0)
316 
317 #define BIQUAD_TDII_FILTER(name, type, min, max, need_clipping) \
318 static void biquad_tdii_## name (BiquadsContext *s, \
319  const void *input, void *output, int len, \
320  double *z1, double *z2, \
321  double *unused1, double *unused2, \
322  double b0, double b1, double b2, \
323  double a1, double a2, int *clippings, \
324  int disabled) \
325 { \
326  const type *ibuf = input; \
327  type *obuf = output; \
328  double w1 = *z1; \
329  double w2 = *z2; \
330  double wet = s->mix; \
331  double dry = 1. - wet; \
332  double in, out; \
333  \
334  a1 = -a1; \
335  a2 = -a2; \
336  \
337  for (int i = 0; i < len; i++) { \
338  in = ibuf[i]; \
339  out = b0 * in + w1; \
340  w1 = b1 * in + w2 + a1 * out; \
341  w2 = b2 * in + a2 * out; \
342  out = out * wet + in * dry; \
343  if (disabled) { \
344  obuf[i] = in; \
345  } else if (need_clipping && out < min) { \
346  (*clippings)++; \
347  obuf[i] = min; \
348  } else if (need_clipping && out > max) { \
349  (*clippings)++; \
350  obuf[i] = max; \
351  } else { \
352  obuf[i] = out; \
353  } \
354  } \
355  *z1 = w1; \
356  *z2 = w2; \
357 }
358 
359 BIQUAD_TDII_FILTER(s16, int16_t, INT16_MIN, INT16_MAX, 1)
360 BIQUAD_TDII_FILTER(s32, int32_t, INT32_MIN, INT32_MAX, 1)
361 BIQUAD_TDII_FILTER(flt, float, -1., 1., 0)
362 BIQUAD_TDII_FILTER(dbl, double, -1., 1., 0)
363 
364 static int config_filter(AVFilterLink *outlink, int reset)
365 {
366  AVFilterContext *ctx = outlink->src;
367  BiquadsContext *s = ctx->priv;
368  AVFilterLink *inlink = ctx->inputs[0];
369  double A = ff_exp10(s->gain / 40);
370  double w0 = 2 * M_PI * s->frequency / inlink->sample_rate;
371  double K = tan(w0 / 2.);
372  double alpha, beta;
373 
374  if (w0 > M_PI) {
375  av_log(ctx, AV_LOG_ERROR,
376  "Invalid frequency %f. Frequency must be less than half the sample-rate %d.\n",
377  s->frequency, inlink->sample_rate);
378  return AVERROR(EINVAL);
379  }
380 
381  switch (s->width_type) {
382  case NONE:
383  alpha = 0.0;
384  break;
385  case HERTZ:
386  alpha = sin(w0) / (2 * s->frequency / s->width);
387  break;
388  case KHERTZ:
389  alpha = sin(w0) / (2 * s->frequency / (s->width * 1000));
390  break;
391  case OCTAVE:
392  alpha = sin(w0) * sinh(log(2.) / 2 * s->width * w0 / sin(w0));
393  break;
394  case QFACTOR:
395  alpha = sin(w0) / (2 * s->width);
396  break;
397  case SLOPE:
398  alpha = sin(w0) / 2 * sqrt((A + 1 / A) * (1 / s->width - 1) + 2);
399  break;
400  default:
401  av_assert0(0);
402  }
403 
404  beta = 2 * sqrt(A);
405 
406  switch (s->filter_type) {
407  case biquad:
408  break;
409  case equalizer:
410  s->a0 = 1 + alpha / A;
411  s->a1 = -2 * cos(w0);
412  s->a2 = 1 - alpha / A;
413  s->b0 = 1 + alpha * A;
414  s->b1 = -2 * cos(w0);
415  s->b2 = 1 - alpha * A;
416  break;
417  case bass:
418  beta = sqrt((A * A + 1) - (A - 1) * (A - 1));
419  case lowshelf:
420  s->a0 = (A + 1) + (A - 1) * cos(w0) + beta * alpha;
421  s->a1 = -2 * ((A - 1) + (A + 1) * cos(w0));
422  s->a2 = (A + 1) + (A - 1) * cos(w0) - beta * alpha;
423  s->b0 = A * ((A + 1) - (A - 1) * cos(w0) + beta * alpha);
424  s->b1 = 2 * A * ((A - 1) - (A + 1) * cos(w0));
425  s->b2 = A * ((A + 1) - (A - 1) * cos(w0) - beta * alpha);
426  break;
427  case treble:
428  beta = sqrt((A * A + 1) - (A - 1) * (A - 1));
429  case highshelf:
430  s->a0 = (A + 1) - (A - 1) * cos(w0) + beta * alpha;
431  s->a1 = 2 * ((A - 1) - (A + 1) * cos(w0));
432  s->a2 = (A + 1) - (A - 1) * cos(w0) - beta * alpha;
433  s->b0 = A * ((A + 1) + (A - 1) * cos(w0) + beta * alpha);
434  s->b1 =-2 * A * ((A - 1) + (A + 1) * cos(w0));
435  s->b2 = A * ((A + 1) + (A - 1) * cos(w0) - beta * alpha);
436  break;
437  case bandpass:
438  if (s->csg) {
439  s->a0 = 1 + alpha;
440  s->a1 = -2 * cos(w0);
441  s->a2 = 1 - alpha;
442  s->b0 = sin(w0) / 2;
443  s->b1 = 0;
444  s->b2 = -sin(w0) / 2;
445  } else {
446  s->a0 = 1 + alpha;
447  s->a1 = -2 * cos(w0);
448  s->a2 = 1 - alpha;
449  s->b0 = alpha;
450  s->b1 = 0;
451  s->b2 = -alpha;
452  }
453  break;
454  case bandreject:
455  s->a0 = 1 + alpha;
456  s->a1 = -2 * cos(w0);
457  s->a2 = 1 - alpha;
458  s->b0 = 1;
459  s->b1 = -2 * cos(w0);
460  s->b2 = 1;
461  break;
462  case lowpass:
463  if (s->poles == 1) {
464  s->a0 = 1;
465  s->a1 = -exp(-w0);
466  s->a2 = 0;
467  s->b0 = 1 + s->a1;
468  s->b1 = 0;
469  s->b2 = 0;
470  } else {
471  s->a0 = 1 + alpha;
472  s->a1 = -2 * cos(w0);
473  s->a2 = 1 - alpha;
474  s->b0 = (1 - cos(w0)) / 2;
475  s->b1 = 1 - cos(w0);
476  s->b2 = (1 - cos(w0)) / 2;
477  }
478  break;
479  case highpass:
480  if (s->poles == 1) {
481  s->a0 = 1;
482  s->a1 = -exp(-w0);
483  s->a2 = 0;
484  s->b0 = (1 - s->a1) / 2;
485  s->b1 = -s->b0;
486  s->b2 = 0;
487  } else {
488  s->a0 = 1 + alpha;
489  s->a1 = -2 * cos(w0);
490  s->a2 = 1 - alpha;
491  s->b0 = (1 + cos(w0)) / 2;
492  s->b1 = -(1 + cos(w0));
493  s->b2 = (1 + cos(w0)) / 2;
494  }
495  break;
496  case allpass:
497  switch (s->order) {
498  case 1:
499  s->a0 = 1.;
500  s->a1 = -(1. - K) / (1. + K);
501  s->a2 = 0.;
502  s->b0 = s->a1;
503  s->b1 = s->a0;
504  s->b2 = 0.;
505  break;
506  case 2:
507  s->a0 = 1 + alpha;
508  s->a1 = -2 * cos(w0);
509  s->a2 = 1 - alpha;
510  s->b0 = 1 - alpha;
511  s->b1 = -2 * cos(w0);
512  s->b2 = 1 + alpha;
513  break;
514  }
515  break;
516  default:
517  av_assert0(0);
518  }
519 
520  av_log(ctx, AV_LOG_VERBOSE, "a=%f %f %f:b=%f %f %f\n", s->a0, s->a1, s->a2, s->b0, s->b1, s->b2);
521 
522  s->a1 /= s->a0;
523  s->a2 /= s->a0;
524  s->b0 /= s->a0;
525  s->b1 /= s->a0;
526  s->b2 /= s->a0;
527  s->a0 /= s->a0;
528 
529  if (s->normalize && fabs(s->b0 + s->b1 + s->b2) > 1e-6) {
530  double factor = (s->a0 + s->a1 + s->a2) / (s->b0 + s->b1 + s->b2);
531 
532  s->b0 *= factor;
533  s->b1 *= factor;
534  s->b2 *= factor;
535  }
536 
537  s->cache = av_realloc_f(s->cache, sizeof(ChanCache), inlink->channels);
538  if (!s->cache)
539  return AVERROR(ENOMEM);
540  if (reset)
541  memset(s->cache, 0, sizeof(ChanCache) * inlink->channels);
542 
543 
544  switch (s->transform_type) {
545  case DI:
546  switch (inlink->format) {
547  case AV_SAMPLE_FMT_S16P:
548  s->filter = biquad_s16;
549  break;
550  case AV_SAMPLE_FMT_S32P:
551  s->filter = biquad_s32;
552  break;
553  case AV_SAMPLE_FMT_FLTP:
554  s->filter = biquad_flt;
555  break;
556  case AV_SAMPLE_FMT_DBLP:
557  s->filter = biquad_dbl;
558  break;
559  default: av_assert0(0);
560  }
561  break;
562  case DII:
563  switch (inlink->format) {
564  case AV_SAMPLE_FMT_S16P:
565  s->filter = biquad_dii_s16;
566  break;
567  case AV_SAMPLE_FMT_S32P:
568  s->filter = biquad_dii_s32;
569  break;
570  case AV_SAMPLE_FMT_FLTP:
571  s->filter = biquad_dii_flt;
572  break;
573  case AV_SAMPLE_FMT_DBLP:
574  s->filter = biquad_dii_dbl;
575  break;
576  default: av_assert0(0);
577  }
578  break;
579  case TDII:
580  switch (inlink->format) {
581  case AV_SAMPLE_FMT_S16P:
582  s->filter = biquad_tdii_s16;
583  break;
584  case AV_SAMPLE_FMT_S32P:
585  s->filter = biquad_tdii_s32;
586  break;
587  case AV_SAMPLE_FMT_FLTP:
588  s->filter = biquad_tdii_flt;
589  break;
590  case AV_SAMPLE_FMT_DBLP:
591  s->filter = biquad_tdii_dbl;
592  break;
593  default: av_assert0(0);
594  }
595  break;
596  default:
597  av_assert0(0);
598  }
599 
600  s->block_align = av_get_bytes_per_sample(inlink->format);
601 
602  return 0;
603 }
604 
605 static int config_output(AVFilterLink *outlink)
606 {
607  return config_filter(outlink, 1);
608 }
609 
610 typedef struct ThreadData {
611  AVFrame *in, *out;
612 } ThreadData;
613 
614 static int filter_channel(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
615 {
616  AVFilterLink *inlink = ctx->inputs[0];
617  ThreadData *td = arg;
618  AVFrame *buf = td->in;
619  AVFrame *out_buf = td->out;
620  BiquadsContext *s = ctx->priv;
621  const int start = (buf->channels * jobnr) / nb_jobs;
622  const int end = (buf->channels * (jobnr+1)) / nb_jobs;
623  int ch;
624 
625  for (ch = start; ch < end; ch++) {
626  if (!((av_channel_layout_extract_channel(inlink->channel_layout, ch) & s->channels))) {
627  if (buf != out_buf)
628  memcpy(out_buf->extended_data[ch], buf->extended_data[ch],
629  buf->nb_samples * s->block_align);
630  continue;
631  }
632 
633  s->filter(s, buf->extended_data[ch], out_buf->extended_data[ch], buf->nb_samples,
634  &s->cache[ch].i1, &s->cache[ch].i2, &s->cache[ch].o1, &s->cache[ch].o2,
635  s->b0, s->b1, s->b2, s->a1, s->a2, &s->cache[ch].clippings, ctx->is_disabled);
636  }
637 
638  return 0;
639 }
640 
641 static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
642 {
643  AVFilterContext *ctx = inlink->dst;
644  BiquadsContext *s = ctx->priv;
645  AVFilterLink *outlink = ctx->outputs[0];
646  AVFrame *out_buf;
647  ThreadData td;
648  int ch;
649 
650  if (av_frame_is_writable(buf)) {
651  out_buf = buf;
652  } else {
653  out_buf = ff_get_audio_buffer(outlink, buf->nb_samples);
654  if (!out_buf) {
655  av_frame_free(&buf);
656  return AVERROR(ENOMEM);
657  }
658  av_frame_copy_props(out_buf, buf);
659  }
660 
661  td.in = buf;
662  td.out = out_buf;
663  ctx->internal->execute(ctx, filter_channel, &td, NULL, FFMIN(outlink->channels, ff_filter_get_nb_threads(ctx)));
664 
665  for (ch = 0; ch < outlink->channels; ch++) {
666  if (s->cache[ch].clippings > 0)
667  av_log(ctx, AV_LOG_WARNING, "Channel %d clipping %d times. Please reduce gain.\n",
668  ch, s->cache[ch].clippings);
669  s->cache[ch].clippings = 0;
670  }
671 
672  if (buf != out_buf)
673  av_frame_free(&buf);
674 
675  return ff_filter_frame(outlink, out_buf);
676 }
677 
678 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
679  char *res, int res_len, int flags)
680 {
681  AVFilterLink *outlink = ctx->outputs[0];
682  int ret;
683 
684  ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
685  if (ret < 0)
686  return ret;
687 
688  return config_filter(outlink, 0);
689 }
690 
691 static av_cold void uninit(AVFilterContext *ctx)
692 {
693  BiquadsContext *s = ctx->priv;
694 
695  av_freep(&s->cache);
696 }
697 
698 static const AVFilterPad inputs[] = {
699  {
700  .name = "default",
701  .type = AVMEDIA_TYPE_AUDIO,
702  .filter_frame = filter_frame,
703  },
704  { NULL }
705 };
706 
707 static const AVFilterPad outputs[] = {
708  {
709  .name = "default",
710  .type = AVMEDIA_TYPE_AUDIO,
711  .config_props = config_output,
712  },
713  { NULL }
714 };
715 
716 #define OFFSET(x) offsetof(BiquadsContext, x)
717 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
718 #define AF AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
719 
720 #define DEFINE_BIQUAD_FILTER(name_, description_) \
721 AVFILTER_DEFINE_CLASS(name_); \
722 static av_cold int name_##_init(AVFilterContext *ctx) \
723 { \
724  BiquadsContext *s = ctx->priv; \
725  s->class = &name_##_class; \
726  s->filter_type = name_; \
727  return init(ctx); \
728 } \
729  \
730 AVFilter ff_af_##name_ = { \
731  .name = #name_, \
732  .description = NULL_IF_CONFIG_SMALL(description_), \
733  .priv_size = sizeof(BiquadsContext), \
734  .init = name_##_init, \
735  .uninit = uninit, \
736  .query_formats = query_formats, \
737  .inputs = inputs, \
738  .outputs = outputs, \
739  .priv_class = &name_##_class, \
740  .process_command = process_command, \
741  .flags = AVFILTER_FLAG_SLICE_THREADS | AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, \
742 }
743 
744 #if CONFIG_EQUALIZER_FILTER
745 static const AVOption equalizer_options[] = {
746  {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 999999, FLAGS},
747  {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 999999, FLAGS},
748  {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
749  {"t", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
750  {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
751  {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
752  {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
753  {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
754  {"k", "kHz", 0, AV_OPT_TYPE_CONST, {.i64=KHERTZ}, 0, 0, FLAGS, "width_type"},
755  {"width", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 99999, FLAGS},
756  {"w", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 99999, FLAGS},
757  {"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
758  {"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
759  {"mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
760  {"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
761  {"channels", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
762  {"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
763  {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
764  {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
765  {"transform", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
766  {"a", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
767  {"di", "direct form I", 0, AV_OPT_TYPE_CONST, {.i64=DI}, 0, 0, AF, "transform_type"},
768  {"dii", "direct form II", 0, AV_OPT_TYPE_CONST, {.i64=DII}, 0, 0, AF, "transform_type"},
769  {"tdii", "transposed direct form II", 0, AV_OPT_TYPE_CONST, {.i64=TDII}, 0, 0, AF, "transform_type"},
770  {NULL}
771 };
772 
773 DEFINE_BIQUAD_FILTER(equalizer, "Apply two-pole peaking equalization (EQ) filter.");
774 #endif /* CONFIG_EQUALIZER_FILTER */
775 #if CONFIG_BASS_FILTER
776 static const AVOption bass_options[] = {
777  {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=100}, 0, 999999, FLAGS},
778  {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=100}, 0, 999999, FLAGS},
779  {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
780  {"t", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
781  {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
782  {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
783  {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
784  {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
785  {"k", "kHz", 0, AV_OPT_TYPE_CONST, {.i64=KHERTZ}, 0, 0, FLAGS, "width_type"},
786  {"width", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
787  {"w", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
788  {"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
789  {"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
790  {"mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
791  {"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
792  {"channels", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
793  {"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
794  {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
795  {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
796  {"transform", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
797  {"a", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
798  {"di", "direct form I", 0, AV_OPT_TYPE_CONST, {.i64=DI}, 0, 0, AF, "transform_type"},
799  {"dii", "direct form II", 0, AV_OPT_TYPE_CONST, {.i64=DII}, 0, 0, AF, "transform_type"},
800  {"tdii", "transposed direct form II", 0, AV_OPT_TYPE_CONST, {.i64=TDII}, 0, 0, AF, "transform_type"},
801  {NULL}
802 };
803 
804 DEFINE_BIQUAD_FILTER(bass, "Boost or cut lower frequencies.");
805 #endif /* CONFIG_BASS_FILTER */
806 #if CONFIG_TREBLE_FILTER
807 static const AVOption treble_options[] = {
808  {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
809  {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
810  {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
811  {"t", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
812  {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
813  {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
814  {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
815  {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
816  {"k", "kHz", 0, AV_OPT_TYPE_CONST, {.i64=KHERTZ}, 0, 0, FLAGS, "width_type"},
817  {"width", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
818  {"w", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
819  {"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
820  {"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
821  {"mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
822  {"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
823  {"channels", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
824  {"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
825  {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
826  {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
827  {"transform", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
828  {"a", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
829  {"di", "direct form I", 0, AV_OPT_TYPE_CONST, {.i64=DI}, 0, 0, AF, "transform_type"},
830  {"dii", "direct form II", 0, AV_OPT_TYPE_CONST, {.i64=DII}, 0, 0, AF, "transform_type"},
831  {"tdii", "transposed direct form II", 0, AV_OPT_TYPE_CONST, {.i64=TDII}, 0, 0, AF, "transform_type"},
832  {NULL}
833 };
834 
835 DEFINE_BIQUAD_FILTER(treble, "Boost or cut upper frequencies.");
836 #endif /* CONFIG_TREBLE_FILTER */
837 #if CONFIG_BANDPASS_FILTER
838 static const AVOption bandpass_options[] = {
839  {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
840  {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
841  {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
842  {"t", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
843  {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
844  {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
845  {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
846  {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
847  {"k", "kHz", 0, AV_OPT_TYPE_CONST, {.i64=KHERTZ}, 0, 0, FLAGS, "width_type"},
848  {"width", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
849  {"w", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
850  {"csg", "use constant skirt gain", OFFSET(csg), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
851  {"mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
852  {"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
853  {"channels", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
854  {"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
855  {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
856  {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
857  {"transform", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
858  {"a", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
859  {"di", "direct form I", 0, AV_OPT_TYPE_CONST, {.i64=DI}, 0, 0, AF, "transform_type"},
860  {"dii", "direct form II", 0, AV_OPT_TYPE_CONST, {.i64=DII}, 0, 0, AF, "transform_type"},
861  {"tdii", "transposed direct form II", 0, AV_OPT_TYPE_CONST, {.i64=TDII}, 0, 0, AF, "transform_type"},
862  {NULL}
863 };
864 
865 DEFINE_BIQUAD_FILTER(bandpass, "Apply a two-pole Butterworth band-pass filter.");
866 #endif /* CONFIG_BANDPASS_FILTER */
867 #if CONFIG_BANDREJECT_FILTER
868 static const AVOption bandreject_options[] = {
869  {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
870  {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
871  {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
872  {"t", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
873  {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
874  {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
875  {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
876  {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
877  {"k", "kHz", 0, AV_OPT_TYPE_CONST, {.i64=KHERTZ}, 0, 0, FLAGS, "width_type"},
878  {"width", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
879  {"w", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
880  {"mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
881  {"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
882  {"channels", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
883  {"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
884  {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
885  {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
886  {"transform", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
887  {"a", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
888  {"di", "direct form I", 0, AV_OPT_TYPE_CONST, {.i64=DI}, 0, 0, AF, "transform_type"},
889  {"dii", "direct form II", 0, AV_OPT_TYPE_CONST, {.i64=DII}, 0, 0, AF, "transform_type"},
890  {"tdii", "transposed direct form II", 0, AV_OPT_TYPE_CONST, {.i64=TDII}, 0, 0, AF, "transform_type"},
891  {NULL}
892 };
893 
894 DEFINE_BIQUAD_FILTER(bandreject, "Apply a two-pole Butterworth band-reject filter.");
895 #endif /* CONFIG_BANDREJECT_FILTER */
896 #if CONFIG_LOWPASS_FILTER
897 static const AVOption lowpass_options[] = {
898  {"frequency", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=500}, 0, 999999, FLAGS},
899  {"f", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=500}, 0, 999999, FLAGS},
900  {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
901  {"t", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
902  {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
903  {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
904  {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
905  {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
906  {"k", "kHz", 0, AV_OPT_TYPE_CONST, {.i64=KHERTZ}, 0, 0, FLAGS, "width_type"},
907  {"width", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS},
908  {"w", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS},
909  {"poles", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, AF},
910  {"p", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, AF},
911  {"mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
912  {"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
913  {"channels", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
914  {"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
915  {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
916  {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
917  {"transform", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
918  {"a", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
919  {"di", "direct form I", 0, AV_OPT_TYPE_CONST, {.i64=DI}, 0, 0, AF, "transform_type"},
920  {"dii", "direct form II", 0, AV_OPT_TYPE_CONST, {.i64=DII}, 0, 0, AF, "transform_type"},
921  {"tdii", "transposed direct form II", 0, AV_OPT_TYPE_CONST, {.i64=TDII}, 0, 0, AF, "transform_type"},
922  {NULL}
923 };
924 
925 DEFINE_BIQUAD_FILTER(lowpass, "Apply a low-pass filter with 3dB point frequency.");
926 #endif /* CONFIG_LOWPASS_FILTER */
927 #if CONFIG_HIGHPASS_FILTER
928 static const AVOption highpass_options[] = {
929  {"frequency", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
930  {"f", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
931  {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
932  {"t", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
933  {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
934  {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
935  {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
936  {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
937  {"k", "kHz", 0, AV_OPT_TYPE_CONST, {.i64=KHERTZ}, 0, 0, FLAGS, "width_type"},
938  {"width", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS},
939  {"w", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS},
940  {"poles", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, AF},
941  {"p", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, AF},
942  {"mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
943  {"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
944  {"channels", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
945  {"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
946  {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
947  {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
948  {"transform", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
949  {"a", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
950  {"di", "direct form I", 0, AV_OPT_TYPE_CONST, {.i64=DI}, 0, 0, AF, "transform_type"},
951  {"dii", "direct form II", 0, AV_OPT_TYPE_CONST, {.i64=DII}, 0, 0, AF, "transform_type"},
952  {"tdii", "transposed direct form II", 0, AV_OPT_TYPE_CONST, {.i64=TDII}, 0, 0, AF, "transform_type"},
953  {NULL}
954 };
955 
956 DEFINE_BIQUAD_FILTER(highpass, "Apply a high-pass filter with 3dB point frequency.");
957 #endif /* CONFIG_HIGHPASS_FILTER */
958 #if CONFIG_ALLPASS_FILTER
959 static const AVOption allpass_options[] = {
960  {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
961  {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
962  {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=HERTZ}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
963  {"t", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=HERTZ}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
964  {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
965  {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
966  {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
967  {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
968  {"k", "kHz", 0, AV_OPT_TYPE_CONST, {.i64=KHERTZ}, 0, 0, FLAGS, "width_type"},
969  {"width", "set filter-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=707.1}, 0, 99999, FLAGS},
970  {"w", "set filter-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=707.1}, 0, 99999, FLAGS},
971  {"mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
972  {"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
973  {"channels", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
974  {"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
975  {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
976  {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
977  {"order", "set filter order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS},
978  {"o", "set filter order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS},
979  {"transform", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
980  {"a", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
981  {"di", "direct form I", 0, AV_OPT_TYPE_CONST, {.i64=DI}, 0, 0, AF, "transform_type"},
982  {"dii", "direct form II", 0, AV_OPT_TYPE_CONST, {.i64=DII}, 0, 0, AF, "transform_type"},
983  {"tdii", "transposed direct form II", 0, AV_OPT_TYPE_CONST, {.i64=TDII}, 0, 0, AF, "transform_type"},
984  {NULL}
985 };
986 
987 DEFINE_BIQUAD_FILTER(allpass, "Apply a two-pole all-pass filter.");
988 #endif /* CONFIG_ALLPASS_FILTER */
989 #if CONFIG_LOWSHELF_FILTER
990 static const AVOption lowshelf_options[] = {
991  {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=100}, 0, 999999, FLAGS},
992  {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=100}, 0, 999999, FLAGS},
993  {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
994  {"t", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
995  {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
996  {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
997  {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
998  {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
999  {"k", "kHz", 0, AV_OPT_TYPE_CONST, {.i64=KHERTZ}, 0, 0, FLAGS, "width_type"},
1000  {"width", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
1001  {"w", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
1002  {"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
1003  {"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
1004  {"mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
1005  {"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
1006  {"channels", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
1007  {"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
1008  {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
1009  {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
1010  {"transform", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
1011  {"a", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
1012  {"di", "direct form I", 0, AV_OPT_TYPE_CONST, {.i64=DI}, 0, 0, AF, "transform_type"},
1013  {"dii", "direct form II", 0, AV_OPT_TYPE_CONST, {.i64=DII}, 0, 0, AF, "transform_type"},
1014  {"tdii", "transposed direct form II", 0, AV_OPT_TYPE_CONST, {.i64=TDII}, 0, 0, AF, "transform_type"},
1015  {NULL}
1016 };
1017 
1018 DEFINE_BIQUAD_FILTER(lowshelf, "Apply a low shelf filter.");
1019 #endif /* CONFIG_LOWSHELF_FILTER */
1020 #if CONFIG_HIGHSHELF_FILTER
1021 static const AVOption highshelf_options[] = {
1022  {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
1023  {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
1024  {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
1025  {"t", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
1026  {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
1027  {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
1028  {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
1029  {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
1030  {"k", "kHz", 0, AV_OPT_TYPE_CONST, {.i64=KHERTZ}, 0, 0, FLAGS, "width_type"},
1031  {"width", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
1032  {"w", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
1033  {"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
1034  {"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
1035  {"mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
1036  {"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
1037  {"channels", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
1038  {"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
1039  {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
1040  {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
1041  {"transform", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
1042  {"a", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
1043  {"di", "direct form I", 0, AV_OPT_TYPE_CONST, {.i64=DI}, 0, 0, AF, "transform_type"},
1044  {"dii", "direct form II", 0, AV_OPT_TYPE_CONST, {.i64=DII}, 0, 0, AF, "transform_type"},
1045  {"tdii", "transposed direct form II", 0, AV_OPT_TYPE_CONST, {.i64=TDII}, 0, 0, AF, "transform_type"},
1046  {NULL}
1047 };
1048 
1049 DEFINE_BIQUAD_FILTER(highshelf, "Apply a high shelf filter.");
1050 #endif /* CONFIG_HIGHSHELF_FILTER */
1051 #if CONFIG_BIQUAD_FILTER
1052 static const AVOption biquad_options[] = {
1053  {"a0", NULL, OFFSET(a0), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT32_MIN, INT32_MAX, FLAGS},
1054  {"a1", NULL, OFFSET(a1), AV_OPT_TYPE_DOUBLE, {.dbl=0}, INT32_MIN, INT32_MAX, FLAGS},
1055  {"a2", NULL, OFFSET(a2), AV_OPT_TYPE_DOUBLE, {.dbl=0}, INT32_MIN, INT32_MAX, FLAGS},
1056  {"b0", NULL, OFFSET(b0), AV_OPT_TYPE_DOUBLE, {.dbl=0}, INT32_MIN, INT32_MAX, FLAGS},
1057  {"b1", NULL, OFFSET(b1), AV_OPT_TYPE_DOUBLE, {.dbl=0}, INT32_MIN, INT32_MAX, FLAGS},
1058  {"b2", NULL, OFFSET(b2), AV_OPT_TYPE_DOUBLE, {.dbl=0}, INT32_MIN, INT32_MAX, FLAGS},
1059  {"mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
1060  {"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
1061  {"channels", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
1062  {"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
1063  {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
1064  {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
1065  {"transform", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
1066  {"a", "set transform type", OFFSET(transform_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TTYPE-1, AF, "transform_type"},
1067  {"di", "direct form I", 0, AV_OPT_TYPE_CONST, {.i64=DI}, 0, 0, AF, "transform_type"},
1068  {"dii", "direct form II", 0, AV_OPT_TYPE_CONST, {.i64=DII}, 0, 0, AF, "transform_type"},
1069  {"tdii", "transposed direct form II", 0, AV_OPT_TYPE_CONST, {.i64=TDII}, 0, 0, AF, "transform_type"},
1070  {NULL}
1071 };
1072 
1073 DEFINE_BIQUAD_FILTER(biquad, "Apply a biquad IIR filter with the given coefficients.");
1074 #endif /* CONFIG_BIQUAD_FILTER */
AV_SAMPLE_FMT_FLTP
float, planar
Definition: samplefmt.h:69
NULL
#define NULL
Definition: coverity.c:32
ThreadData::out
AVFrame * out
Definition: af_adeclick.c:494
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:308
av_realloc_f
#define av_realloc_f(p, o, n)
Definition: tableprint_vlc.h:33
AVOption
AVOption.
Definition: opt.h:248
TransformType
TransformType
Definition: webp.c:110
BiquadsContext::cache
ChanCache * cache
Definition: af_biquads.c:129
bandpass
Definition: af_biquads.c:77
ret
ret
Definition: filter_design.txt:187
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
avfilter.h
Main libavfilter public API header.
AV_OPT_TYPE_INT
Definition: opt.h:225
ChanCache::i2
double i2
Definition: af_biquads.c:104
a0
#define a0
Definition: regdef.h:46
highshelf
Definition: af_biquads.c:83
AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
AV_SAMPLE_FMT_DBLP
double, planar
Definition: samplefmt.h:70
a1
#define a1
Definition: regdef.h:47
QFACTOR
Definition: af_biquads.c:90
inputs
static const AVFilterPad inputs[]
Definition: af_biquads.c:698
ff_set_common_channel_layouts
int ff_set_common_channel_layouts(AVFilterContext *ctx, AVFilterChannelLayouts *channel_layouts)
A helper for query_formats() which sets all links to the same list of channel layouts/sample rates...
Definition: formats.c:569
AVFilterContext::is_disabled
int is_disabled
the enabled state from the last expression evaluation
Definition: avfilter.h:388
ff_make_format_list
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:287
biquad
Definition: af_biquads.c:73
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:60
lowshelf
Definition: af_biquads.c:82
AVFilterContext::inputs
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:349
FilterType
FilterType
Definition: af_anequalizer.c:33
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
AV_OPT_TYPE_CONST
Definition: opt.h:234
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1091
OFFSET
#define OFFSET(x)
Definition: af_biquads.c:716
av_cold
#define av_cold
Definition: attributes.h:88
opt.h
AVOptions.
end
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:92
BiquadsContext::filter
void(* filter)(struct BiquadsContext *s, const void *ibuf, void *obuf, int len, double *i1, double *i2, double *o1, double *o2, double b0, double b1, double b2, double a1, double a2, int *clippings, int disabled)
Definition: af_biquads.c:132
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:210
channels
channels
Definition: aptx.h:33
A
#define A(x)
Definition: vp56_arith.h:28
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AV_OPT_TYPE_CHANNEL_LAYOUT
Definition: opt.h:241
outputs
static const AVFilterPad outputs[]
Definition: af_biquads.c:707
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:54
init
static av_cold int init(AVFilterContext *ctx)
Definition: af_biquads.c:138
ff_exp10
static av_always_inline double ff_exp10(double x)
Compute 10^x for floating point values.
Definition: ffmath.h:42
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
ff_set_common_formats
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:588
td
#define td
Definition: regdef.h:70
FLAGS
#define FLAGS
Definition: af_biquads.c:717
treble
Definition: af_biquads.c:76
DI
Definition: af_biquads.c:97
filter
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce then the filter should push the output frames on the output link immediately As an exception to the previous rule if the input frame is enough to produce several output frames then the filter needs output only at least one per link The additional frames can be left buffered in the filter
Definition: filter_design.txt:228
KHERTZ
Definition: af_biquads.c:92
ff_get_audio_buffer
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
Definition: audio.c:86
TDII
Definition: af_biquads.c:99
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
ff_filter_process_command
int ff_filter_process_command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Generic processing of user supplied commands that are set in the same way as the filter options...
Definition: avfilter.c:885
AVFilterContext::priv
void * priv
private data for use by the filter
Definition: avfilter.h:356
arg
const char * arg
Definition: jacosubdec.c:66
AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
avassert.h
simple assert() macros that are a bit more flexible than ISO C assert().
BiquadsContext::channels
uint64_t channels
Definition: af_biquads.c:122
exp
int8_t exp
Definition: eval.c:72
ChanCache::o1
double o1
Definition: af_biquads.c:105
HERTZ
Definition: af_biquads.c:88
AVFrame::channels
int channels
number of audio channels, only used for audio.
Definition: frame.h:614
ff_filter_get_nb_threads
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Definition: avfilter.c:800
NONE
Definition: af_biquads.c:87
FFMIN
#define FFMIN(a, b)
Definition: common.h:96
AV_SAMPLE_FMT_S32P
signed 32 bits, planar
Definition: samplefmt.h:68
width
#define width
void
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
int32_t
int32_t
Definition: audio_convert.c:194
ctx
AVFormatContext * ctx
Definition: movenc.c:48
a2
#define a2
Definition: regdef.h:48
AV_OPT_TYPE_BOOL
Definition: opt.h:242
b0
static double b0(void *priv, double x, double y)
Definition: vf_xfade.c:1585
s
#define s(width, name)
Definition: cbs_vp9.c:257
allpass
Definition: af_biquads.c:79
SLOPE
Definition: af_biquads.c:91
BIQUAD_DII_FILTER
#define BIQUAD_DII_FILTER(name, type, min, max, need_clipping)
Definition: af_biquads.c:269
NB_WTYPE
Definition: af_biquads.c:93
highpass
Definition: af_biquads.c:80
AVFilterChannelLayouts
A list of supported channel layouts.
Definition: formats.h:86
b1
static double b1(void *priv, double x, double y)
Definition: vf_xfade.c:1586
mix
static int mix(int c0, int c1)
Definition: 4xm.c:714
AV_OPT_TYPE_DOUBLE
Definition: opt.h:227
BIQUAD_FILTER
#define BIQUAD_FILTER(name, type, min, max, need_clipping)
Definition: af_biquads.c:186
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
filter_channel
static int filter_channel(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: af_biquads.c:614
av_frame_is_writable
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Definition: frame.c:607
ThreadData
Used for passing data between threads.
Definition: dsddec.c:67
config_output
static int config_output(AVFilterLink *outlink)
Definition: af_biquads.c:605
alpha
static const int16_t alpha[]
Definition: ilbcdata.h:55
bass
Definition: af_biquads.c:75
in
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)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
Definition: audio_convert.c:194
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
BIQUAD_TDII_FILTER
#define BIQUAD_TDII_FILTER(name, type, min, max, need_clipping)
Definition: af_biquads.c:317
DEFINE_BIQUAD_FILTER
#define DEFINE_BIQUAD_FILTER(name_, description_)
Definition: af_biquads.c:720
factor
static const int factor[16]
Definition: vf_pp7.c:75
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: af_biquads.c:153
equalizer
Definition: af_biquads.c:74
ChanCache::o2
double o2
Definition: af_biquads.c:105
DII
Definition: af_biquads.c:98
AVFilterContext::outputs
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:353
layouts
enum MovChannelLayoutTag * layouts
Definition: mov_chan.c:434
ff_all_samplerates
AVFilterFormats * ff_all_samplerates(void)
Definition: formats.c:422
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:560
AVFilterContext::internal
AVFilterInternal * internal
An opaque struct for libavfilter internal use.
Definition: avfilter.h:381
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_biquads.c:691
av_get_bytes_per_sample
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
Return number of bytes per sample.
Definition: samplefmt.c:106
ChanCache::clippings
int clippings
Definition: af_biquads.c:106
inlink
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
Definition: filter_design.txt:207
ffmath.h
internal math functions header
lowpass
Definition: af_biquads.c:81
av_channel_layout_extract_channel
uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index)
Get the channel with the given index in channel_layout.
Definition: channel_layout.c:271
AVFilterInternal::execute
avfilter_execute_func * execute
Definition: internal.h:136
config_filter
static int config_filter(AVFilterLink *outlink, int reset)
Definition: af_biquads.c:364
WidthType
WidthType
Definition: af_biquads.c:86
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
Definition: af_biquads.c:641
NB_TTYPE
Definition: af_biquads.c:100
len
int len
Definition: vorbis_enc_data.h:452
AF
#define AF
Definition: af_biquads.c:718
ChanCache::i1
double i1
Definition: af_biquads.c:104
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:65
AVFilterContext
An instance of a filter.
Definition: avfilter.h:341
sample_fmts
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:884
out
FILE * out
Definition: movenc.c:54
process_command
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
Definition: af_biquads.c:678
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
AV_SAMPLE_FMT_S16P
signed 16 bits, planar
Definition: samplefmt.h:67
BiquadsContext::frequency
double frequency
Definition: af_biquads.c:119
M_PI
#define M_PI
Definition: mathematics.h:52
bandreject
Definition: af_biquads.c:78
ThreadData::in
AVFrame * in
Definition: af_afftdn.c:1083
formats
formats
Definition: signature.h:48
internal.h
internal API functions
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
ff_all_channel_counts
AVFilterChannelLayouts * ff_all_channel_counts(void)
Construct an AVFilterChannelLayouts coding for any channel layout, with known or unknown disposition...
Definition: formats.c:437
AVFrame::extended_data
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:355
BiquadsContext::filter_type
enum FilterType filter_type
Definition: af_biquads.c:112
AVFrame::nb_samples
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:374
ff_set_common_samplerates
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:576
av_frame_copy_props
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:671
OCTAVE
Definition: af_biquads.c:89
b2
static double b2(void *priv, double x, double y)
Definition: vf_xfade.c:1587
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