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Imported Debian version 2.4.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavfilter / af_biquads.c
CommitLineData
2ba45a60
DM		 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/opt.h"
67#include "audio.h"
68#include "avfilter.h"
69#include "internal.h"
70
71enum FilterType {
72 biquad,
73 equalizer,
74 bass,
75 treble,
76 band,
77 bandpass,
78 bandreject,
79 allpass,
80 highpass,
81 lowpass,
82};
83
84enum WidthType {
85 NONE,
86 HERTZ,
87 OCTAVE,
88 QFACTOR,
89 SLOPE,
90};
91
92typedef struct ChanCache {
93 double i1, i2;
94 double o1, o2;
95} ChanCache;
96
97typedef struct {
98 const AVClass *class;
99
100 enum FilterType filter_type;
101 enum WidthType width_type;
102 int poles;
103 int csg;
104
105 double gain;
106 double frequency;
107 double width;
108
109 double a0, a1, a2;
110 double b0, b1, b2;
111
112 ChanCache *cache;
113
114 void (*filter)(const void *ibuf, void *obuf, int len,
115 double *i1, double *i2, double *o1, double *o2,
116 double b0, double b1, double b2, double a1, double a2);
117} BiquadsContext;
118
119static av_cold int init(AVFilterContext *ctx)
120{
121 BiquadsContext *p = ctx->priv;
122
123 if (p->filter_type != biquad) {
124 if (p->frequency <= 0 || p->width <= 0) {
125 av_log(ctx, AV_LOG_ERROR, "Invalid frequency %f and/or width %f <= 0\n",
126 p->frequency, p->width);
127 return AVERROR(EINVAL);
128 }
129 }
130
131 return 0;
132}
133
134static int query_formats(AVFilterContext *ctx)
135{
136 AVFilterFormats *formats;
137 AVFilterChannelLayouts *layouts;
138 static const enum AVSampleFormat sample_fmts[] = {
139 AV_SAMPLE_FMT_S16P,
140 AV_SAMPLE_FMT_S32P,
141 AV_SAMPLE_FMT_FLTP,
142 AV_SAMPLE_FMT_DBLP,
143 AV_SAMPLE_FMT_NONE
144 };
145
146 layouts = ff_all_channel_layouts();
147 if (!layouts)
148 return AVERROR(ENOMEM);
149 ff_set_common_channel_layouts(ctx, layouts);
150
151 formats = ff_make_format_list(sample_fmts);
152 if (!formats)
153 return AVERROR(ENOMEM);
154 ff_set_common_formats(ctx, formats);
155
156 formats = ff_all_samplerates();
157 if (!formats)
158 return AVERROR(ENOMEM);
159 ff_set_common_samplerates(ctx, formats);
160
161 return 0;
162}
163
164#define BIQUAD_FILTER(name, type, min, max, need_clipping) \
165static void biquad_## name (const void *input, void *output, int len, \
166 double *in1, double *in2, \
167 double *out1, double *out2, \
168 double b0, double b1, double b2, \
169 double a1, double a2) \
170{ \
171 const type *ibuf = input; \
172 type *obuf = output; \
173 double i1 = *in1; \
174 double i2 = *in2; \
175 double o1 = *out1; \
176 double o2 = *out2; \
177 int i; \
178 a1 = -a1; \
179 a2 = -a2; \
180 \
181 for (i = 0; i+1 < len; i++) { \
182 o2 = i2 * b2 + i1 * b1 + ibuf[i] * b0 + o2 * a2 + o1 * a1; \
183 i2 = ibuf[i]; \
184 if (need_clipping && o2 < min) { \
185 av_log(NULL, AV_LOG_WARNING, "clipping\n"); \
186 obuf[i] = min; \
187 } else if (need_clipping && o2 > max) { \
188 av_log(NULL, AV_LOG_WARNING, "clipping\n"); \
189 obuf[i] = max; \
190 } else { \
191 obuf[i] = o2; \
192 } \
193 i++; \
194 o1 = i1 * b2 + i2 * b1 + ibuf[i] * b0 + o1 * a2 + o2 * a1; \
195 i1 = ibuf[i]; \
196 if (need_clipping && o1 < min) { \
197 av_log(NULL, AV_LOG_WARNING, "clipping\n"); \
198 obuf[i] = min; \
199 } else if (need_clipping && o1 > max) { \
200 av_log(NULL, AV_LOG_WARNING, "clipping\n"); \
201 obuf[i] = max; \
202 } else { \
203 obuf[i] = o1; \
204 } \
205 } \
206 if (i < len) { \
207 double o0 = ibuf[i] * b0 + i1 * b1 + i2 * b2 + o1 * a1 + o2 * a2; \
208 i2 = i1; \
209 i1 = ibuf[i]; \
210 o2 = o1; \
211 o1 = o0; \
212 if (need_clipping && o0 < min) { \
213 av_log(NULL, AV_LOG_WARNING, "clipping\n"); \
214 obuf[i] = min; \
215 } else if (need_clipping && o0 > max) { \
216 av_log(NULL, AV_LOG_WARNING, "clipping\n"); \
217 obuf[i] = max; \
218 } else { \
219 obuf[i] = o0; \
220 } \
221 } \
222 *in1 = i1; \
223 *in2 = i2; \
224 *out1 = o1; \
225 *out2 = o2; \
226}
227
228BIQUAD_FILTER(s16, int16_t, INT16_MIN, INT16_MAX, 1)
229BIQUAD_FILTER(s32, int32_t, INT32_MIN, INT32_MAX, 1)
230BIQUAD_FILTER(flt, float, -1., 1., 0)
231BIQUAD_FILTER(dbl, double, -1., 1., 0)
232
233static int config_output(AVFilterLink *outlink)
234{
235 AVFilterContext *ctx = outlink->src;
236 BiquadsContext *p = ctx->priv;
237 AVFilterLink *inlink = ctx->inputs[0];
238 double A = exp(p->gain / 40 * log(10.));
239 double w0 = 2 * M_PI * p->frequency / inlink->sample_rate;
240 double alpha;
241
242 if (w0 > M_PI) {
243 av_log(ctx, AV_LOG_ERROR,
244 "Invalid frequency %f. Frequency must be less than half the sample-rate %d.\n",
245 p->frequency, inlink->sample_rate);
246 return AVERROR(EINVAL);
247 }
248
249 switch (p->width_type) {
250 case NONE:
251 alpha = 0.0;
252 break;
253 case HERTZ:
254 alpha = sin(w0) / (2 * p->frequency / p->width);
255 break;
256 case OCTAVE:
257 alpha = sin(w0) * sinh(log(2.) / 2 * p->width * w0 / sin(w0));
258 break;
259 case QFACTOR:
260 alpha = sin(w0) / (2 * p->width);
261 break;
262 case SLOPE:
263 alpha = sin(w0) / 2 * sqrt((A + 1 / A) * (1 / p->width - 1) + 2);
264 break;
265 default:
266 av_assert0(0);
267 }
268
269 switch (p->filter_type) {
270 case biquad:
271 break;
272 case equalizer:
273 p->a0 = 1 + alpha / A;
274 p->a1 = -2 * cos(w0);
275 p->a2 = 1 - alpha / A;
276 p->b0 = 1 + alpha * A;
277 p->b1 = -2 * cos(w0);
278 p->b2 = 1 - alpha * A;
279 break;
280 case bass:
281 p->a0 = (A + 1) + (A - 1) * cos(w0) + 2 * sqrt(A) * alpha;
282 p->a1 = -2 * ((A - 1) + (A + 1) * cos(w0));
283 p->a2 = (A + 1) + (A - 1) * cos(w0) - 2 * sqrt(A) * alpha;
284 p->b0 = A * ((A + 1) - (A - 1) * cos(w0) + 2 * sqrt(A) * alpha);
285 p->b1 = 2 * A * ((A - 1) - (A + 1) * cos(w0));
286 p->b2 = A * ((A + 1) - (A - 1) * cos(w0) - 2 * sqrt(A) * alpha);
287 break;
288 case treble:
289 p->a0 = (A + 1) - (A - 1) * cos(w0) + 2 * sqrt(A) * alpha;
290 p->a1 = 2 * ((A - 1) - (A + 1) * cos(w0));
291 p->a2 = (A + 1) - (A - 1) * cos(w0) - 2 * sqrt(A) * alpha;
292 p->b0 = A * ((A + 1) + (A - 1) * cos(w0) + 2 * sqrt(A) * alpha);
293 p->b1 =-2 * A * ((A - 1) + (A + 1) * cos(w0));
294 p->b2 = A * ((A + 1) + (A - 1) * cos(w0) - 2 * sqrt(A) * alpha);
295 break;
296 case bandpass:
297 if (p->csg) {
298 p->a0 = 1 + alpha;
299 p->a1 = -2 * cos(w0);
300 p->a2 = 1 - alpha;
301 p->b0 = sin(w0) / 2;
302 p->b1 = 0;
303 p->b2 = -sin(w0) / 2;
304 } else {
305 p->a0 = 1 + alpha;
306 p->a1 = -2 * cos(w0);
307 p->a2 = 1 - alpha;
308 p->b0 = alpha;
309 p->b1 = 0;
310 p->b2 = -alpha;
311 }
312 break;
313 case bandreject:
314 p->a0 = 1 + alpha;
315 p->a1 = -2 * cos(w0);
316 p->a2 = 1 - alpha;
317 p->b0 = 1;
318 p->b1 = -2 * cos(w0);
319 p->b2 = 1;
320 break;
321 case lowpass:
322 if (p->poles == 1) {
323 p->a0 = 1;
324 p->a1 = -exp(-w0);
325 p->a2 = 0;
326 p->b0 = 1 + p->a1;
327 p->b1 = 0;
328 p->b2 = 0;
329 } else {
330 p->a0 = 1 + alpha;
331 p->a1 = -2 * cos(w0);
332 p->a2 = 1 - alpha;
333 p->b0 = (1 - cos(w0)) / 2;
334 p->b1 = 1 - cos(w0);
335 p->b2 = (1 - cos(w0)) / 2;
336 }
337 break;
338 case highpass:
339 if (p->poles == 1) {
340 p->a0 = 1;
341 p->a1 = -exp(-w0);
342 p->a2 = 0;
343 p->b0 = (1 - p->a1) / 2;
344 p->b1 = -p->b0;
345 p->b2 = 0;
346 } else {
347 p->a0 = 1 + alpha;
348 p->a1 = -2 * cos(w0);
349 p->a2 = 1 - alpha;
350 p->b0 = (1 + cos(w0)) / 2;
351 p->b1 = -(1 + cos(w0));
352 p->b2 = (1 + cos(w0)) / 2;
353 }
354 break;
355 case allpass:
356 p->a0 = 1 + alpha;
357 p->a1 = -2 * cos(w0);
358 p->a2 = 1 - alpha;
359 p->b0 = 1 - alpha;
360 p->b1 = -2 * cos(w0);
361 p->b2 = 1 + alpha;
362 break;
363 default:
364 av_assert0(0);
365 }
366
367 p->a1 /= p->a0;
368 p->a2 /= p->a0;
369 p->b0 /= p->a0;
370 p->b1 /= p->a0;
371 p->b2 /= p->a0;
372
373 p->cache = av_realloc_f(p->cache, sizeof(ChanCache), inlink->channels);
374 if (!p->cache)
375 return AVERROR(ENOMEM);
376 memset(p->cache, 0, sizeof(ChanCache) * inlink->channels);
377
378 switch (inlink->format) {
379 case AV_SAMPLE_FMT_S16P: p->filter = biquad_s16; break;
380 case AV_SAMPLE_FMT_S32P: p->filter = biquad_s32; break;
381 case AV_SAMPLE_FMT_FLTP: p->filter = biquad_flt; break;
382 case AV_SAMPLE_FMT_DBLP: p->filter = biquad_dbl; break;
383 default: av_assert0(0);
384 }
385
386 return 0;
387}
388
389static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
390{
391 BiquadsContext *p = inlink->dst->priv;
392 AVFilterLink *outlink = inlink->dst->outputs[0];
393 AVFrame *out_buf;
394 int nb_samples = buf->nb_samples;
395 int ch;
396
397 if (av_frame_is_writable(buf)) {
398 out_buf = buf;
399 } else {
400 out_buf = ff_get_audio_buffer(inlink, nb_samples);
401 if (!out_buf)
402 return AVERROR(ENOMEM);
403 av_frame_copy_props(out_buf, buf);
404 }
405
406 for (ch = 0; ch < av_frame_get_channels(buf); ch++)
407 p->filter(buf->extended_data[ch],
408 out_buf->extended_data[ch], nb_samples,
409 &p->cache[ch].i1, &p->cache[ch].i2,
410 &p->cache[ch].o1, &p->cache[ch].o2,
411 p->b0, p->b1, p->b2, p->a1, p->a2);
412
413 if (buf != out_buf)
414 av_frame_free(&buf);
415
416 return ff_filter_frame(outlink, out_buf);
417}
418
419static av_cold void uninit(AVFilterContext *ctx)
420{
421 BiquadsContext *p = ctx->priv;
422
423 av_freep(&p->cache);
424}
425
426static const AVFilterPad inputs[] = {
427 {
428 .name = "default",
429 .type = AVMEDIA_TYPE_AUDIO,
430 .filter_frame = filter_frame,
431 },
432 { NULL }
433};
434
435static const AVFilterPad outputs[] = {
436 {
437 .name = "default",
438 .type = AVMEDIA_TYPE_AUDIO,
439 .config_props = config_output,
440 },
441 { NULL }
442};
443
444#define OFFSET(x) offsetof(BiquadsContext, x)
445#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
446
447#define DEFINE_BIQUAD_FILTER(name_, description_) \
448AVFILTER_DEFINE_CLASS(name_); \
449static av_cold int name_##_init(AVFilterContext *ctx) \
450{ \
451 BiquadsContext *p = ctx->priv; \
452 p->class = &name_##_class; \
453 p->filter_type = name_; \
454 return init(ctx); \
455} \
456 \
457AVFilter ff_af_##name_ = { \
458 .name = #name_, \
459 .description = NULL_IF_CONFIG_SMALL(description_), \
460 .priv_size = sizeof(BiquadsContext), \
461 .init = name_##_init, \
462 .uninit = uninit, \
463 .query_formats = query_formats, \
464 .inputs = inputs, \
465 .outputs = outputs, \
466 .priv_class = &name_##_class, \
467}
468
469#if CONFIG_EQUALIZER_FILTER
470static const AVOption equalizer_options[] = {
471 {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 999999, FLAGS},
472 {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 999999, FLAGS},
473 {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"},
474 {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
475 {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
476 {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
477 {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
478 {"width", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 999, FLAGS},
479 {"w", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 999, FLAGS},
480 {"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
481 {"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
482 {NULL}
483};
484
485DEFINE_BIQUAD_FILTER(equalizer, "Apply two-pole peaking equalization (EQ) filter.");
486#endif /* CONFIG_EQUALIZER_FILTER */
487#if CONFIG_BASS_FILTER
488static const AVOption bass_options[] = {
489 {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=100}, 0, 999999, FLAGS},
490 {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=100}, 0, 999999, FLAGS},
491 {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"},
492 {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
493 {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
494 {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
495 {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
496 {"width", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
497 {"w", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
498 {"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
499 {"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
500 {NULL}
501};
502
503DEFINE_BIQUAD_FILTER(bass, "Boost or cut lower frequencies.");
504#endif /* CONFIG_BASS_FILTER */
505#if CONFIG_TREBLE_FILTER
506static const AVOption treble_options[] = {
507 {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
508 {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
509 {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"},
510 {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
511 {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
512 {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
513 {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
514 {"width", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
515 {"w", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
516 {"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
517 {"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
518 {NULL}
519};
520
521DEFINE_BIQUAD_FILTER(treble, "Boost or cut upper frequencies.");
522#endif /* CONFIG_TREBLE_FILTER */
523#if CONFIG_BANDPASS_FILTER
524static const AVOption bandpass_options[] = {
525 {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
526 {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
527 {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"},
528 {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
529 {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
530 {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
531 {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
532 {"width", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 999, FLAGS},
533 {"w", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 999, FLAGS},
534 {"csg", "use constant skirt gain", OFFSET(csg), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
535 {NULL}
536};
537
538DEFINE_BIQUAD_FILTER(bandpass, "Apply a two-pole Butterworth band-pass filter.");
539#endif /* CONFIG_BANDPASS_FILTER */
540#if CONFIG_BANDREJECT_FILTER
541static const AVOption bandreject_options[] = {
542 {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
543 {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
544 {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"},
545 {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
546 {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
547 {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
548 {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
549 {"width", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 999, FLAGS},
550 {"w", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 999, FLAGS},
551 {NULL}
552};
553
554DEFINE_BIQUAD_FILTER(bandreject, "Apply a two-pole Butterworth band-reject filter.");
555#endif /* CONFIG_BANDREJECT_FILTER */
556#if CONFIG_LOWPASS_FILTER
557static const AVOption lowpass_options[] = {
558 {"frequency", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=500}, 0, 999999, FLAGS},
559 {"f", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=500}, 0, 999999, FLAGS},
560 {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"},
561 {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
562 {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
563 {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
564 {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
565 {"width", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS},
566 {"w", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS},
567 {"poles", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS},
568 {"p", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS},
569 {NULL}
570};
571
572DEFINE_BIQUAD_FILTER(lowpass, "Apply a low-pass filter with 3dB point frequency.");
573#endif /* CONFIG_LOWPASS_FILTER */
574#if CONFIG_HIGHPASS_FILTER
575static const AVOption highpass_options[] = {
576 {"frequency", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
577 {"f", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
578 {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"},
579 {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
580 {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
581 {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
582 {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
583 {"width", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS},
584 {"w", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS},
585 {"poles", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS},
586 {"p", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS},
587 {NULL}
588};
589
590DEFINE_BIQUAD_FILTER(highpass, "Apply a high-pass filter with 3dB point frequency.");
591#endif /* CONFIG_HIGHPASS_FILTER */
592#if CONFIG_ALLPASS_FILTER
593static const AVOption allpass_options[] = {
594 {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
595 {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
596 {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=HERTZ}, HERTZ, SLOPE, FLAGS, "width_type"},
597 {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
598 {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
599 {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
600 {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
601 {"width", "set filter-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=707.1}, 0, 99999, FLAGS},
602 {"w", "set filter-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=707.1}, 0, 99999, FLAGS},
603 {NULL}
604};
605
606DEFINE_BIQUAD_FILTER(allpass, "Apply a two-pole all-pass filter.");
607#endif /* CONFIG_ALLPASS_FILTER */
608#if CONFIG_BIQUAD_FILTER
609static const AVOption biquad_options[] = {
610 {"a0", NULL, OFFSET(a0), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS},
611 {"a1", NULL, OFFSET(a1), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS},
612 {"a2", NULL, OFFSET(a2), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS},
613 {"b0", NULL, OFFSET(b0), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS},
614 {"b1", NULL, OFFSET(b1), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS},
615 {"b2", NULL, OFFSET(b2), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS},
616 {NULL}
617};
618
619DEFINE_BIQUAD_FILTER(biquad, "Apply a biquad IIR filter with the given coefficients.");
620#endif /* CONFIG_BIQUAD_FILTER */
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