FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/avf_showfreqs.c
Date: 2022-11-26 13:19:19
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1 /*
2 * Copyright (c) 2015 Paul B Mahol
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <float.h>
22 #include <math.h>
23
24 #include "libavutil/tx.h"
25 #include "libavutil/avassert.h"
26 #include "libavutil/avstring.h"
27 #include "libavutil/channel_layout.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/parseutils.h"
31 #include "audio.h"
32 #include "filters.h"
33 #include "video.h"
34 #include "avfilter.h"
35 #include "internal.h"
36 #include "window_func.h"
37
38 enum DataMode { MAGNITUDE, PHASE, DELAY, NB_DATA };
39 enum DisplayMode { LINE, BAR, DOT, NB_MODES };
40 enum ChannelMode { COMBINED, SEPARATE, NB_CMODES };
41 enum FrequencyScale { FS_LINEAR, FS_LOG, FS_RLOG, NB_FSCALES };
42 enum AmplitudeScale { AS_LINEAR, AS_SQRT, AS_CBRT, AS_LOG, NB_ASCALES };
43
44 typedef struct ShowFreqsContext {
45 const AVClass *class;
46 int w, h;
47 int mode;
48 int data_mode;
49 int cmode;
50 int fft_size;
51 int ascale, fscale;
52 int avg;
53 int win_func;
54 char *ch_layout_str;
55 uint8_t *bypass;
56 AVChannelLayout ch_layout;
57 AVTXContext *fft;
58 av_tx_fn tx_fn;
59 AVComplexFloat **fft_input;
60 AVComplexFloat **fft_data;
61 AVFrame *window;
62 float **avg_data;
63 float *window_func_lut;
64 float overlap;
65 float minamp;
66 int hop_size;
67 int nb_channels;
68 int nb_draw_channels;
69 int nb_freq;
70 int win_size;
71 float scale;
72 char *colors;
73 int64_t pts;
74 int64_t old_pts;
75 AVRational frame_rate;
76 } ShowFreqsContext;
77
78 #define OFFSET(x) offsetof(ShowFreqsContext, x)
79 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
80
81 static const AVOption showfreqs_options[] = {
82 { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS },
83 { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS },
84 { "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
85 { "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
86 { "mode", "set display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=BAR}, 0, NB_MODES-1, FLAGS, "mode" },
87 { "line", "show lines", 0, AV_OPT_TYPE_CONST, {.i64=LINE}, 0, 0, FLAGS, "mode" },
88 { "bar", "show bars", 0, AV_OPT_TYPE_CONST, {.i64=BAR}, 0, 0, FLAGS, "mode" },
89 { "dot", "show dots", 0, AV_OPT_TYPE_CONST, {.i64=DOT}, 0, 0, FLAGS, "mode" },
90 { "ascale", "set amplitude scale", OFFSET(ascale), AV_OPT_TYPE_INT, {.i64=AS_LOG}, 0, NB_ASCALES-1, FLAGS, "ascale" },
91 { "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=AS_LINEAR}, 0, 0, FLAGS, "ascale" },
92 { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=AS_SQRT}, 0, 0, FLAGS, "ascale" },
93 { "cbrt", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64=AS_CBRT}, 0, 0, FLAGS, "ascale" },
94 { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=AS_LOG}, 0, 0, FLAGS, "ascale" },
95 { "fscale", "set frequency scale", OFFSET(fscale), AV_OPT_TYPE_INT, {.i64=FS_LINEAR}, 0, NB_FSCALES-1, FLAGS, "fscale" },
96 { "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=FS_LINEAR}, 0, 0, FLAGS, "fscale" },
97 { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=FS_LOG}, 0, 0, FLAGS, "fscale" },
98 { "rlog", "reverse logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=FS_RLOG}, 0, 0, FLAGS, "fscale" },
99 { "win_size", "set window size", OFFSET(fft_size), AV_OPT_TYPE_INT, {.i64=2048}, 16, 65536, FLAGS },
100 WIN_FUNC_OPTION("win_func", OFFSET(win_func), FLAGS, WFUNC_HANNING),
101 { "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=1.}, 0., 1., FLAGS },
102 { "averaging", "set time averaging", OFFSET(avg), AV_OPT_TYPE_INT, {.i64=1}, 0, INT32_MAX, FLAGS },
103 { "colors", "set channels colors", OFFSET(colors), AV_OPT_TYPE_STRING, {.str = "red|green|blue|yellow|orange|lime|pink|magenta|brown" }, 0, 0, FLAGS },
104 { "cmode", "set channel mode", OFFSET(cmode), AV_OPT_TYPE_INT, {.i64=COMBINED}, 0, NB_CMODES-1, FLAGS, "cmode" },
105 { "combined", "show all channels in same window", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "cmode" },
106 { "separate", "show each channel in own window", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "cmode" },
107 { "minamp", "set minimum amplitude", OFFSET(minamp), AV_OPT_TYPE_FLOAT, {.dbl=1e-6}, FLT_MIN, 1e-6, FLAGS },
108 { "data", "set data mode", OFFSET(data_mode), AV_OPT_TYPE_INT, {.i64=MAGNITUDE}, 0, NB_DATA-1, FLAGS, "data" },
109 { "magnitude", "show magnitude", 0, AV_OPT_TYPE_CONST, {.i64=MAGNITUDE}, 0, 0, FLAGS, "data" },
110 { "phase", "show phase", 0, AV_OPT_TYPE_CONST, {.i64=PHASE}, 0, 0, FLAGS, "data" },
111 { "delay", "show group delay",0, AV_OPT_TYPE_CONST, {.i64=DELAY}, 0, 0, FLAGS, "data" },
112 { "channels", "set channels to draw", OFFSET(ch_layout_str), AV_OPT_TYPE_STRING, {.str="all"}, 0, 0, FLAGS },
113 { NULL }
114 };
115
116 AVFILTER_DEFINE_CLASS(showfreqs);
117
118 static int query_formats(AVFilterContext *ctx)
119 {
120 AVFilterFormats *formats = NULL;
121 AVFilterChannelLayouts *layouts = NULL;
122 AVFilterLink *inlink = ctx->inputs[0];
123 AVFilterLink *outlink = ctx->outputs[0];
124 static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE };
125 static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
126 int ret;
127
128 /* set input audio formats */
129 formats = ff_make_format_list(sample_fmts);
130 if ((ret = ff_formats_ref(formats, &inlink->outcfg.formats)) < 0)
131 return ret;
132
133 layouts = ff_all_channel_counts();
134 if ((ret = ff_channel_layouts_ref(layouts, &inlink->outcfg.channel_layouts)) < 0)
135 return ret;
136
137 formats = ff_all_samplerates();
138 if ((ret = ff_formats_ref(formats, &inlink->outcfg.samplerates)) < 0)
139 return ret;
140
141 /* set output video format */
142 formats = ff_make_format_list(pix_fmts);
143 if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0)
144 return ret;
145
146 return 0;
147 }
148
149 static int config_output(AVFilterLink *outlink)
150 {
151 AVFilterContext *ctx = outlink->src;
152 AVFilterLink *inlink = ctx->inputs[0];
153 ShowFreqsContext *s = ctx->priv;
154 float overlap, scale = 1.f;
155 int i, ret;
156
157 s->old_pts = AV_NOPTS_VALUE;
158 s->nb_freq = s->fft_size / 2;
159 s->win_size = s->fft_size;
160 av_tx_uninit(&s->fft);
161 ret = av_tx_init(&s->fft, &s->tx_fn, AV_TX_FLOAT_FFT, 0, s->fft_size, &scale, 0);
162 if (ret < 0) {
163 av_log(ctx, AV_LOG_ERROR, "Unable to create FFT context. "
164 "The window size might be too high.\n");
165 return ret;
166 }
167
168 /* FFT buffers: x2 for each (display) channel buffer.
169 * Note: we use free and malloc instead of a realloc-like function to
170 * make sure the buffer is aligned in memory for the FFT functions. */
171 for (i = 0; i < s->nb_channels; i++) {
172 av_freep(&s->fft_input[i]);
173 av_freep(&s->fft_data[i]);
174 av_freep(&s->avg_data[i]);
175 }
176 av_freep(&s->bypass);
177 av_freep(&s->fft_input);
178 av_freep(&s->fft_data);
179 av_freep(&s->avg_data);
180 s->nb_channels = inlink->ch_layout.nb_channels;
181
182 s->bypass = av_calloc(s->nb_channels, sizeof(*s->bypass));
183 if (!s->bypass)
184 return AVERROR(ENOMEM);
185 s->fft_input = av_calloc(s->nb_channels, sizeof(*s->fft_input));
186 if (!s->fft_input)
187 return AVERROR(ENOMEM);
188 s->fft_data = av_calloc(s->nb_channels, sizeof(*s->fft_data));
189 if (!s->fft_data)
190 return AVERROR(ENOMEM);
191 s->avg_data = av_calloc(s->nb_channels, sizeof(*s->avg_data));
192 if (!s->avg_data)
193 return AVERROR(ENOMEM);
194 for (i = 0; i < s->nb_channels; i++) {
195 s->fft_input[i] = av_calloc(FFALIGN(s->win_size, 512), sizeof(**s->fft_input));
196 s->fft_data[i] = av_calloc(FFALIGN(s->win_size, 512), sizeof(**s->fft_data));
197 s->avg_data[i] = av_calloc(s->nb_freq, sizeof(**s->avg_data));
198 if (!s->fft_data[i] || !s->avg_data[i] || !s->fft_input[i])
199 return AVERROR(ENOMEM);
200 }
201
202 /* pre-calc windowing function */
203 s->window_func_lut = av_realloc_f(s->window_func_lut, s->win_size,
204 sizeof(*s->window_func_lut));
205 if (!s->window_func_lut)
206 return AVERROR(ENOMEM);
207 generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap);
208 if (s->overlap == 1.)
209 s->overlap = overlap;
210 s->hop_size = (1. - s->overlap) * s->win_size;
211 if (s->hop_size < 1) {
212 av_log(ctx, AV_LOG_ERROR, "overlap %f too big\n", s->overlap);
213 return AVERROR(EINVAL);
214 }
215
216 for (s->scale = 0, i = 0; i < s->win_size; i++) {
217 s->scale += s->window_func_lut[i] * s->window_func_lut[i];
218 }
219
220 s->window = ff_get_audio_buffer(inlink, s->win_size * 2);
221 if (!s->window)
222 return AVERROR(ENOMEM);
223
224 outlink->frame_rate = s->frame_rate;
225 outlink->time_base = av_inv_q(outlink->frame_rate);
226 outlink->sample_aspect_ratio = (AVRational){1,1};
227 outlink->w = s->w;
228 outlink->h = s->h;
229
230 ret = av_channel_layout_copy(&s->ch_layout, &inlink->ch_layout);
231 if (ret < 0)
232 return ret;
233 s->nb_draw_channels = s->nb_channels;
234
235 if (strcmp(s->ch_layout_str, "all")) {
236 int nb_draw_channels = 0;
237 av_channel_layout_from_string(&s->ch_layout,
238 s->ch_layout_str);
239
240 for (int ch = 0; ch < s->nb_channels; ch++) {
241 const enum AVChannel channel = av_channel_layout_channel_from_index(&inlink->ch_layout, ch);
242
243 s->bypass[ch] = av_channel_layout_index_from_channel(&s->ch_layout, channel) < 0;
244 nb_draw_channels += s->bypass[ch] == 0;
245 }
246
247 s->nb_draw_channels = nb_draw_channels;
248 }
249
250 return 0;
251 }
252
253 static inline void draw_dot(AVFrame *out, int x, int y, uint8_t fg[4])
254 {
255
256 uint32_t color = AV_RL32(out->data[0] + y * out->linesize[0] + x * 4);
257
258 if ((color & 0xffffff) != 0)
259 AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg) | color);
260 else
261 AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg));
262 }
263
264 static int get_sx(ShowFreqsContext *s, int f)
265 {
266 switch (s->fscale) {
267 case FS_LINEAR:
268 return (s->w/(float)s->nb_freq)*f;
269 case FS_LOG:
270 return s->w-pow(s->w, (s->nb_freq-f-1)/(s->nb_freq-1.));
271 case FS_RLOG:
272 return pow(s->w, f/(s->nb_freq-1.));
273 }
274
275 return 0;
276 }
277
278 static float get_bsize(ShowFreqsContext *s, int f)
279 {
280 switch (s->fscale) {
281 case FS_LINEAR:
282 return s->w/(float)s->nb_freq;
283 case FS_LOG:
284 return pow(s->w, (s->nb_freq-f-1)/(s->nb_freq-1.))-
285 pow(s->w, (s->nb_freq-f-2)/(s->nb_freq-1.));
286 case FS_RLOG:
287 return pow(s->w, (f+1)/(s->nb_freq-1.))-
288 pow(s->w, f /(s->nb_freq-1.));
289 }
290
291 return 1.;
292 }
293
294 static inline void plot_freq(ShowFreqsContext *s, int ch,
295 double a, int f, uint8_t fg[4], int *prev_y,
296 AVFrame *out, AVFilterLink *outlink)
297 {
298 const int w = s->w;
299 const float min = s->minamp;
300 const float avg = s->avg_data[ch][f];
301 const float bsize = get_bsize(s, f);
302 const int sx = get_sx(s, f);
303 int end = outlink->h;
304 int x, y, i;
305
306 switch(s->ascale) {
307 case AS_SQRT:
308 a = 1.0 - sqrt(a);
309 break;
310 case AS_CBRT:
311 a = 1.0 - cbrt(a);
312 break;
313 case AS_LOG:
314 a = log(av_clipd(a, min, 1)) / log(min);
315 break;
316 case AS_LINEAR:
317 a = 1.0 - a;
318 break;
319 }
320
321 switch (s->cmode) {
322 case COMBINED:
323 y = a * outlink->h - 1;
324 break;
325 case SEPARATE:
326 end = (outlink->h / s->nb_draw_channels) * (ch + 1);
327 y = (outlink->h / s->nb_draw_channels) * ch + a * (outlink->h / s->nb_draw_channels) - 1;
328 break;
329 default:
330 av_assert0(0);
331 }
332 if (y < 0)
333 return;
334
335 switch (s->avg) {
336 case 0:
337 y = s->avg_data[ch][f] = !outlink->frame_count_in ? y : FFMIN(0, y);
338 break;
339 case 1:
340 break;
341 default:
342 s->avg_data[ch][f] = avg + y * (y - avg) / (FFMIN(outlink->frame_count_in + 1, s->avg) * (float)y);
343 y = av_clip(s->avg_data[ch][f], 0, outlink->h - 1);
344 break;
345 }
346
347 switch(s->mode) {
348 case LINE:
349 if (*prev_y == -1) {
350 *prev_y = y;
351 }
352 if (y <= *prev_y) {
353 for (x = sx + 1; x < sx + bsize && x < w; x++)
354 draw_dot(out, x, y, fg);
355 for (i = y; i <= *prev_y; i++)
356 draw_dot(out, sx, i, fg);
357 } else {
358 for (i = *prev_y; i <= y; i++)
359 draw_dot(out, sx, i, fg);
360 for (x = sx + 1; x < sx + bsize && x < w; x++)
361 draw_dot(out, x, i - 1, fg);
362 }
363 *prev_y = y;
364 break;
365 case BAR:
366 for (x = sx; x < sx + bsize && x < w; x++)
367 for (i = y; i < end; i++)
368 draw_dot(out, x, i, fg);
369 break;
370 case DOT:
371 for (x = sx; x < sx + bsize && x < w; x++)
372 draw_dot(out, x, y, fg);
373 break;
374 }
375 }
376
377 static int plot_freqs(AVFilterLink *inlink, int64_t pts)
378 {
379 AVFilterContext *ctx = inlink->dst;
380 AVFilterLink *outlink = ctx->outputs[0];
381 ShowFreqsContext *s = ctx->priv;
382 AVFrame *in = s->window;
383 const int win_size = s->win_size;
384 char *colors, *color, *saveptr = NULL;
385 AVFrame *out;
386 int ch, n;
387
388 /* fill FFT input with the number of samples available */
389 for (ch = 0; ch < s->nb_channels; ch++) {
390 const float *p = (float *)in->extended_data[ch];
391
392 if (s->bypass[ch])
393 continue;
394
395 for (n = 0; n < win_size; n++) {
396 s->fft_input[ch][n].re = p[n] * s->window_func_lut[n];
397 s->fft_input[ch][n].im = 0;
398 }
399 }
400
401 /* run FFT on each samples set */
402 for (ch = 0; ch < s->nb_channels; ch++) {
403 if (s->bypass[ch])
404 continue;
405
406 s->tx_fn(s->fft, s->fft_data[ch], s->fft_input[ch], sizeof(AVComplexFloat));
407 }
408
409 s->pts = av_rescale_q(pts, inlink->time_base, outlink->time_base);
410 if (s->old_pts >= s->pts)
411 return 0;
412 s->old_pts = s->pts;
413
414 #define RE(x, ch) s->fft_data[ch][x].re
415 #define IM(x, ch) s->fft_data[ch][x].im
416 #define M(a, b) (sqrt((a) * (a) + (b) * (b)))
417 #define P(a, b) (atan2((b), (a)))
418
419 colors = av_strdup(s->colors);
420 if (!colors)
421 return AVERROR(ENOMEM);
422
423 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
424 if (!out) {
425 av_free(colors);
426 return AVERROR(ENOMEM);
427 }
428
429 for (n = 0; n < outlink->h; n++)
430 memset(out->data[0] + out->linesize[0] * n, 0, outlink->w * 4);
431
432 for (ch = 0; ch < s->nb_channels; ch++) {
433 uint8_t fg[4] = { 0xff, 0xff, 0xff, 0xff };
434 int prev_y = -1, f;
435 double a;
436
437 color = av_strtok(ch == 0 ? colors : NULL, " |", &saveptr);
438 if (color)
439 av_parse_color(fg, color, -1, ctx);
440
441 if (s->bypass[ch])
442 continue;
443
444 switch (s->data_mode) {
445 case MAGNITUDE:
446 for (f = 0; f < s->nb_freq; f++) {
447 a = av_clipd(M(RE(f, ch), IM(f, ch)) / s->scale, 0, 1);
448
449 plot_freq(s, ch, a, f, fg, &prev_y, out, outlink);
450 }
451 break;
452 case PHASE:
453 for (f = 0; f < s->nb_freq; f++) {
454 a = av_clipd((M_PI + P(RE(f, ch), IM(f, ch))) / (2. * M_PI), 0, 1);
455
456 plot_freq(s, ch, a, f, fg, &prev_y, out, outlink);
457 }
458 break;
459 case DELAY:
460 for (f = 0; f < s->nb_freq; f++) {
461 a = av_clipd((M_PI - P(IM(f, ch) * RE(f-1, ch) - IM(f-1, ch) * RE(f, ch),
462 RE(f, ch) * RE(f-1, ch) + IM(f, ch) * IM(f-1, ch))) / (2. * M_PI), 0, 1);
463
464 plot_freq(s, ch, a, f, fg, &prev_y, out, outlink);
465 }
466 break;
467 }
468 }
469
470 av_free(colors);
471 out->pts = s->pts;
472 out->duration = 1;
473 out->sample_aspect_ratio = (AVRational){1,1};
474 return ff_filter_frame(outlink, out);
475 }
476
477 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
478 {
479 AVFilterContext *ctx = inlink->dst;
480 ShowFreqsContext *s = ctx->priv;
481 const int offset = s->win_size - s->hop_size;
482 int64_t pts = in->pts;
483
484 for (int ch = 0; ch < in->ch_layout.nb_channels; ch++) {
485 float *dst = (float *)s->window->extended_data[ch];
486
487 memmove(dst, &dst[s->hop_size], offset * sizeof(float));
488 memcpy(&dst[offset], in->extended_data[ch], in->nb_samples * sizeof(float));
489 memset(&dst[offset + in->nb_samples], 0, (s->hop_size - in->nb_samples) * sizeof(float));
490 }
491
492 av_frame_free(&in);
493
494 return plot_freqs(inlink, pts);
495 }
496
497 static int activate(AVFilterContext *ctx)
498 {
499 AVFilterLink *inlink = ctx->inputs[0];
500 AVFilterLink *outlink = ctx->outputs[0];
501 ShowFreqsContext *s = ctx->priv;
502 AVFrame *in;
503 int ret;
504
505 FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
506
507 ret = ff_inlink_consume_samples(inlink, s->hop_size, s->hop_size, &in);
508 if (ret < 0)
509 return ret;
510
511 if (ret > 0)
512 ret = filter_frame(inlink, in);
513 if (ret < 0)
514 return ret;
515
516 if (ff_inlink_queued_samples(inlink) >= s->hop_size) {
517 ff_filter_set_ready(ctx, 10);
518 return 0;
519 }
520
521 FF_FILTER_FORWARD_STATUS(inlink, outlink);
522 FF_FILTER_FORWARD_WANTED(outlink, inlink);
523
524 return FFERROR_NOT_READY;
525 }
526
527 static av_cold void uninit(AVFilterContext *ctx)
528 {
529 ShowFreqsContext *s = ctx->priv;
530 int i;
531
532 av_channel_layout_uninit(&s->ch_layout);
533 av_tx_uninit(&s->fft);
534 for (i = 0; i < s->nb_channels; i++) {
535 if (s->fft_input)
536 av_freep(&s->fft_input[i]);
537 if (s->fft_data)
538 av_freep(&s->fft_data[i]);
539 if (s->avg_data)
540 av_freep(&s->avg_data[i]);
541 }
542 av_freep(&s->bypass);
543 av_freep(&s->fft_input);
544 av_freep(&s->fft_data);
545 av_freep(&s->avg_data);
546 av_freep(&s->window_func_lut);
547 av_frame_free(&s->window);
548 }
549
550 static const AVFilterPad showfreqs_inputs[] = {
551 {
552 .name = "default",
553 .type = AVMEDIA_TYPE_AUDIO,
554 },
555 };
556
557 static const AVFilterPad showfreqs_outputs[] = {
558 {
559 .name = "default",
560 .type = AVMEDIA_TYPE_VIDEO,
561 .config_props = config_output,
562 },
563 };
564
565 const AVFilter ff_avf_showfreqs = {
566 .name = "showfreqs",
567 .description = NULL_IF_CONFIG_SMALL("Convert input audio to a frequencies video output."),
568 .uninit = uninit,
569 .priv_size = sizeof(ShowFreqsContext),
570 .activate = activate,
571 FILTER_INPUTS(showfreqs_inputs),
572 FILTER_OUTPUTS(showfreqs_outputs),
573 FILTER_QUERY_FUNC(query_formats),
574 .priv_class = &showfreqs_class,
575 };
576