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path: root/libavfilter/avf_showfreqs.c (plain)
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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 "libavcodec/avfft.h"
25#include "libavutil/audio_fifo.h"
26#include "libavutil/avassert.h"
27#include "libavutil/avstring.h"
28#include "libavutil/channel_layout.h"
29#include "libavutil/intreadwrite.h"
30#include "libavutil/opt.h"
31#include "libavutil/parseutils.h"
32#include "audio.h"
33#include "video.h"
34#include "avfilter.h"
35#include "internal.h"
36#include "window_func.h"
37
38enum DisplayMode { LINE, BAR, DOT, NB_MODES };
39enum ChannelMode { COMBINED, SEPARATE, NB_CMODES };
40enum FrequencyScale { FS_LINEAR, FS_LOG, FS_RLOG, NB_FSCALES };
41enum AmplitudeScale { AS_LINEAR, AS_SQRT, AS_CBRT, AS_LOG, NB_ASCALES };
42
43typedef struct ShowFreqsContext {
44 const AVClass *class;
45 int w, h;
46 int mode;
47 int cmode;
48 int fft_bits;
49 int ascale, fscale;
50 int avg;
51 int win_func;
52 FFTContext *fft;
53 FFTComplex **fft_data;
54 float **avg_data;
55 float *window_func_lut;
56 float overlap;
57 float minamp;
58 int hop_size;
59 int nb_channels;
60 int nb_freq;
61 int win_size;
62 float scale;
63 char *colors;
64 AVAudioFifo *fifo;
65 int64_t pts;
66} ShowFreqsContext;
67
68#define OFFSET(x) offsetof(ShowFreqsContext, x)
69#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
70
71static const AVOption showfreqs_options[] = {
72 { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS },
73 { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS },
74 { "mode", "set display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=BAR}, 0, NB_MODES-1, FLAGS, "mode" },
75 { "line", "show lines", 0, AV_OPT_TYPE_CONST, {.i64=LINE}, 0, 0, FLAGS, "mode" },
76 { "bar", "show bars", 0, AV_OPT_TYPE_CONST, {.i64=BAR}, 0, 0, FLAGS, "mode" },
77 { "dot", "show dots", 0, AV_OPT_TYPE_CONST, {.i64=DOT}, 0, 0, FLAGS, "mode" },
78 { "ascale", "set amplitude scale", OFFSET(ascale), AV_OPT_TYPE_INT, {.i64=AS_LOG}, 0, NB_ASCALES-1, FLAGS, "ascale" },
79 { "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=AS_LINEAR}, 0, 0, FLAGS, "ascale" },
80 { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=AS_SQRT}, 0, 0, FLAGS, "ascale" },
81 { "cbrt", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64=AS_CBRT}, 0, 0, FLAGS, "ascale" },
82 { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=AS_LOG}, 0, 0, FLAGS, "ascale" },
83 { "fscale", "set frequency scale", OFFSET(fscale), AV_OPT_TYPE_INT, {.i64=FS_LINEAR}, 0, NB_FSCALES-1, FLAGS, "fscale" },
84 { "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=FS_LINEAR}, 0, 0, FLAGS, "fscale" },
85 { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=FS_LOG}, 0, 0, FLAGS, "fscale" },
86 { "rlog", "reverse logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=FS_RLOG}, 0, 0, FLAGS, "fscale" },
87 { "win_size", "set window size", OFFSET(fft_bits), AV_OPT_TYPE_INT, {.i64=11}, 4, 16, FLAGS, "fft" },
88 { "w16", 0, 0, AV_OPT_TYPE_CONST, {.i64=4}, 0, 0, FLAGS, "fft" },
89 { "w32", 0, 0, AV_OPT_TYPE_CONST, {.i64=5}, 0, 0, FLAGS, "fft" },
90 { "w64", 0, 0, AV_OPT_TYPE_CONST, {.i64=6}, 0, 0, FLAGS, "fft" },
91 { "w128", 0, 0, AV_OPT_TYPE_CONST, {.i64=7}, 0, 0, FLAGS, "fft" },
92 { "w256", 0, 0, AV_OPT_TYPE_CONST, {.i64=8}, 0, 0, FLAGS, "fft" },
93 { "w512", 0, 0, AV_OPT_TYPE_CONST, {.i64=9}, 0, 0, FLAGS, "fft" },
94 { "w1024", 0, 0, AV_OPT_TYPE_CONST, {.i64=10}, 0, 0, FLAGS, "fft" },
95 { "w2048", 0, 0, AV_OPT_TYPE_CONST, {.i64=11}, 0, 0, FLAGS, "fft" },
96 { "w4096", 0, 0, AV_OPT_TYPE_CONST, {.i64=12}, 0, 0, FLAGS, "fft" },
97 { "w8192", 0, 0, AV_OPT_TYPE_CONST, {.i64=13}, 0, 0, FLAGS, "fft" },
98 { "w16384", 0, 0, AV_OPT_TYPE_CONST, {.i64=14}, 0, 0, FLAGS, "fft" },
99 { "w32768", 0, 0, AV_OPT_TYPE_CONST, {.i64=15}, 0, 0, FLAGS, "fft" },
100 { "w65536", 0, 0, AV_OPT_TYPE_CONST, {.i64=16}, 0, 0, FLAGS, "fft" },
101 { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64=WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" },
102 { "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, FLAGS, "win_func" },
103 { "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" },
104 { "hanning", "Hanning", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" },
105 { "hamming", "Hamming", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING}, 0, 0, FLAGS, "win_func" },
106 { "blackman", "Blackman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },
107 { "welch", "Welch", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH}, 0, 0, FLAGS, "win_func" },
108 { "flattop", "Flat-top", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP}, 0, 0, FLAGS, "win_func" },
109 { "bharris", "Blackman-Harris", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS}, 0, 0, FLAGS, "win_func" },
110 { "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" },
111 { "bhann", "Bartlett-Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN}, 0, 0, FLAGS, "win_func" },
112 { "sine", "Sine", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE}, 0, 0, FLAGS, "win_func" },
113 { "nuttall", "Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL}, 0, 0, FLAGS, "win_func" },
114 { "lanczos", "Lanczos", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS}, 0, 0, FLAGS, "win_func" },
115 { "gauss", "Gauss", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS}, 0, 0, FLAGS, "win_func" },
116 { "tukey", "Tukey", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY}, 0, 0, FLAGS, "win_func" },
117 { "dolph", "Dolph-Chebyshev", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH}, 0, 0, FLAGS, "win_func" },
118 { "cauchy", "Cauchy", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY}, 0, 0, FLAGS, "win_func" },
119 { "parzen", "Parzen", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN}, 0, 0, FLAGS, "win_func" },
120 { "poisson", "Poisson", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON}, 0, 0, FLAGS, "win_func" },
121 { "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=1.}, 0., 1., FLAGS },
122 { "averaging", "set time averaging", OFFSET(avg), AV_OPT_TYPE_INT, {.i64=1}, 0, INT32_MAX, FLAGS },
123 { "colors", "set channels colors", OFFSET(colors), AV_OPT_TYPE_STRING, {.str = "red|green|blue|yellow|orange|lime|pink|magenta|brown" }, 0, 0, FLAGS },
124 { "cmode", "set channel mode", OFFSET(cmode), AV_OPT_TYPE_INT, {.i64=COMBINED}, 0, NB_CMODES-1, FLAGS, "cmode" },
125 { "combined", "show all channels in same window", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "cmode" },
126 { "separate", "show each channel in own window", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "cmode" },
127 { "minamp", "set minimum amplitude", OFFSET(minamp), AV_OPT_TYPE_FLOAT, {.dbl=1e-6}, FLT_MIN, 1e-6, FLAGS },
128 { NULL }
129};
130
131AVFILTER_DEFINE_CLASS(showfreqs);
132
133static int query_formats(AVFilterContext *ctx)
134{
135 AVFilterFormats *formats = NULL;
136 AVFilterChannelLayouts *layouts = NULL;
137 AVFilterLink *inlink = ctx->inputs[0];
138 AVFilterLink *outlink = ctx->outputs[0];
139 static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE };
140 static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
141 int ret;
142
143 /* set input audio formats */
144 formats = ff_make_format_list(sample_fmts);
145 if ((ret = ff_formats_ref(formats, &inlink->out_formats)) < 0)
146 return ret;
147
148 layouts = ff_all_channel_layouts();
149 if ((ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts)) < 0)
150 return ret;
151
152 formats = ff_all_samplerates();
153 if ((ret = ff_formats_ref(formats, &inlink->out_samplerates)) < 0)
154 return ret;
155
156 /* set output video format */
157 formats = ff_make_format_list(pix_fmts);
158 if ((ret = ff_formats_ref(formats, &outlink->in_formats)) < 0)
159 return ret;
160
161 return 0;
162}
163
164static av_cold int init(AVFilterContext *ctx)
165{
166 ShowFreqsContext *s = ctx->priv;
167
168 s->pts = AV_NOPTS_VALUE;
169
170 return 0;
171}
172
173static int config_output(AVFilterLink *outlink)
174{
175 AVFilterContext *ctx = outlink->src;
176 AVFilterLink *inlink = ctx->inputs[0];
177 ShowFreqsContext *s = ctx->priv;
178 float overlap;
179 int i;
180
181 s->nb_freq = 1 << (s->fft_bits - 1);
182 s->win_size = s->nb_freq << 1;
183 av_audio_fifo_free(s->fifo);
184 av_fft_end(s->fft);
185 s->fft = av_fft_init(s->fft_bits, 0);
186 if (!s->fft) {
187 av_log(ctx, AV_LOG_ERROR, "Unable to create FFT context. "
188 "The window size might be too high.\n");
189 return AVERROR(ENOMEM);
190 }
191
192 /* FFT buffers: x2 for each (display) channel buffer.
193 * Note: we use free and malloc instead of a realloc-like function to
194 * make sure the buffer is aligned in memory for the FFT functions. */
195 for (i = 0; i < s->nb_channels; i++) {
196 av_freep(&s->fft_data[i]);
197 av_freep(&s->avg_data[i]);
198 }
199 av_freep(&s->fft_data);
200 av_freep(&s->avg_data);
201 s->nb_channels = inlink->channels;
202
203 s->fft_data = av_calloc(s->nb_channels, sizeof(*s->fft_data));
204 if (!s->fft_data)
205 return AVERROR(ENOMEM);
206 s->avg_data = av_calloc(s->nb_channels, sizeof(*s->avg_data));
207 if (!s->fft_data)
208 return AVERROR(ENOMEM);
209 for (i = 0; i < s->nb_channels; i++) {
210 s->fft_data[i] = av_calloc(s->win_size, sizeof(**s->fft_data));
211 s->avg_data[i] = av_calloc(s->nb_freq, sizeof(**s->avg_data));
212 if (!s->fft_data[i] || !s->avg_data[i])
213 return AVERROR(ENOMEM);
214 }
215
216 /* pre-calc windowing function */
217 s->window_func_lut = av_realloc_f(s->window_func_lut, s->win_size,
218 sizeof(*s->window_func_lut));
219 if (!s->window_func_lut)
220 return AVERROR(ENOMEM);
221 ff_generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap);
222 if (s->overlap == 1.)
223 s->overlap = overlap;
224 s->hop_size = (1. - s->overlap) * s->win_size;
225 if (s->hop_size < 1) {
226 av_log(ctx, AV_LOG_ERROR, "overlap %f too big\n", s->overlap);
227 return AVERROR(EINVAL);
228 }
229
230 for (s->scale = 0, i = 0; i < s->win_size; i++) {
231 s->scale += s->window_func_lut[i] * s->window_func_lut[i];
232 }
233
234 outlink->frame_rate = av_make_q(inlink->sample_rate, s->win_size * (1.-s->overlap));
235 outlink->sample_aspect_ratio = (AVRational){1,1};
236 outlink->w = s->w;
237 outlink->h = s->h;
238
239 s->fifo = av_audio_fifo_alloc(inlink->format, inlink->channels, s->win_size);
240 if (!s->fifo)
241 return AVERROR(ENOMEM);
242 return 0;
243}
244
245static inline void draw_dot(AVFrame *out, int x, int y, uint8_t fg[4])
246{
247
248 uint32_t color = AV_RL32(out->data[0] + y * out->linesize[0] + x * 4);
249
250 if ((color & 0xffffff) != 0)
251 AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg) | color);
252 else
253 AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg));
254}
255
256static int get_sx(ShowFreqsContext *s, int f)
257{
258 switch (s->fscale) {
259 case FS_LINEAR:
260 return (s->w/(float)s->nb_freq)*f;
261 case FS_LOG:
262 return s->w-pow(s->w, (s->nb_freq-f-1)/(s->nb_freq-1.));
263 case FS_RLOG:
264 return pow(s->w, f/(s->nb_freq-1.));
265 }
266
267 return 0;
268}
269
270static float get_bsize(ShowFreqsContext *s, int f)
271{
272 switch (s->fscale) {
273 case FS_LINEAR:
274 return s->w/(float)s->nb_freq;
275 case FS_LOG:
276 return pow(s->w, (s->nb_freq-f-1)/(s->nb_freq-1.))-
277 pow(s->w, (s->nb_freq-f-2)/(s->nb_freq-1.));
278 case FS_RLOG:
279 return pow(s->w, (f+1)/(s->nb_freq-1.))-
280 pow(s->w, f /(s->nb_freq-1.));
281 }
282
283 return 1.;
284}
285
286static inline void plot_freq(ShowFreqsContext *s, int ch,
287 double a, int f, uint8_t fg[4], int *prev_y,
288 AVFrame *out, AVFilterLink *outlink)
289{
290 const int w = s->w;
291 const float min = s->minamp;
292 const float avg = s->avg_data[ch][f];
293 const float bsize = get_bsize(s, f);
294 const int sx = get_sx(s, f);
295 int end = outlink->h;
296 int x, y, i;
297
298 switch(s->ascale) {
299 case AS_SQRT:
300 a = 1.0 - sqrt(a);
301 break;
302 case AS_CBRT:
303 a = 1.0 - cbrt(a);
304 break;
305 case AS_LOG:
306 a = log(av_clipd(a, min, 1)) / log(min);
307 break;
308 case AS_LINEAR:
309 a = 1.0 - a;
310 break;
311 }
312
313 switch (s->cmode) {
314 case COMBINED:
315 y = a * outlink->h - 1;
316 break;
317 case SEPARATE:
318 end = (outlink->h / s->nb_channels) * (ch + 1);
319 y = (outlink->h / s->nb_channels) * ch + a * (outlink->h / s->nb_channels) - 1;
320 break;
321 default:
322 av_assert0(0);
323 }
324 if (y < 0)
325 return;
326
327 switch (s->avg) {
328 case 0:
329 y = s->avg_data[ch][f] = !outlink->frame_count_in ? y : FFMIN(avg, y);
330 break;
331 case 1:
332 break;
333 default:
334 s->avg_data[ch][f] = avg + y * (y - avg) / (FFMIN(outlink->frame_count_in + 1, s->avg) * y);
335 y = s->avg_data[ch][f];
336 break;
337 }
338
339 switch(s->mode) {
340 case LINE:
341 if (*prev_y == -1) {
342 *prev_y = y;
343 }
344 if (y <= *prev_y) {
345 for (x = sx + 1; x < sx + bsize && x < w; x++)
346 draw_dot(out, x, y, fg);
347 for (i = y; i <= *prev_y; i++)
348 draw_dot(out, sx, i, fg);
349 } else {
350 for (i = *prev_y; i <= y; i++)
351 draw_dot(out, sx, i, fg);
352 for (x = sx + 1; x < sx + bsize && x < w; x++)
353 draw_dot(out, x, i - 1, fg);
354 }
355 *prev_y = y;
356 break;
357 case BAR:
358 for (x = sx; x < sx + bsize && x < w; x++)
359 for (i = y; i < end; i++)
360 draw_dot(out, x, i, fg);
361 break;
362 case DOT:
363 for (x = sx; x < sx + bsize && x < w; x++)
364 draw_dot(out, x, y, fg);
365 break;
366 }
367}
368
369static int plot_freqs(AVFilterLink *inlink, AVFrame *in)
370{
371 AVFilterContext *ctx = inlink->dst;
372 AVFilterLink *outlink = ctx->outputs[0];
373 ShowFreqsContext *s = ctx->priv;
374 const int win_size = s->win_size;
375 char *colors, *color, *saveptr = NULL;
376 AVFrame *out;
377 int ch, n;
378
379 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
380 if (!out)
381 return AVERROR(ENOMEM);
382
383 for (n = 0; n < outlink->h; n++)
384 memset(out->data[0] + out->linesize[0] * n, 0, outlink->w * 4);
385
386 /* fill FFT input with the number of samples available */
387 for (ch = 0; ch < s->nb_channels; ch++) {
388 const float *p = (float *)in->extended_data[ch];
389
390 for (n = 0; n < in->nb_samples; n++) {
391 s->fft_data[ch][n].re = p[n] * s->window_func_lut[n];
392 s->fft_data[ch][n].im = 0;
393 }
394 for (; n < win_size; n++) {
395 s->fft_data[ch][n].re = 0;
396 s->fft_data[ch][n].im = 0;
397 }
398 }
399
400 /* run FFT on each samples set */
401 for (ch = 0; ch < s->nb_channels; ch++) {
402 av_fft_permute(s->fft, s->fft_data[ch]);
403 av_fft_calc(s->fft, s->fft_data[ch]);
404 }
405
406#define RE(x, ch) s->fft_data[ch][x].re
407#define IM(x, ch) s->fft_data[ch][x].im
408#define M(a, b) (sqrt((a) * (a) + (b) * (b)))
409
410 colors = av_strdup(s->colors);
411 if (!colors) {
412 av_frame_free(&out);
413 return AVERROR(ENOMEM);
414 }
415
416 for (ch = 0; ch < s->nb_channels; ch++) {
417 uint8_t fg[4] = { 0xff, 0xff, 0xff, 0xff };
418 int prev_y = -1, f;
419 double a;
420
421 color = av_strtok(ch == 0 ? colors : NULL, " |", &saveptr);
422 if (color)
423 av_parse_color(fg, color, -1, ctx);
424
425 a = av_clipd(M(RE(0, ch), 0) / s->scale, 0, 1);
426 plot_freq(s, ch, a, 0, fg, &prev_y, out, outlink);
427
428 for (f = 1; f < s->nb_freq; f++) {
429 a = av_clipd(M(RE(f, ch), IM(f, ch)) / s->scale, 0, 1);
430
431 plot_freq(s, ch, a, f, fg, &prev_y, out, outlink);
432 }
433 }
434
435 av_free(colors);
436 out->pts = in->pts;
437 return ff_filter_frame(outlink, out);
438}
439
440static int filter_frame(AVFilterLink *inlink, AVFrame *in)
441{
442 AVFilterContext *ctx = inlink->dst;
443 ShowFreqsContext *s = ctx->priv;
444 AVFrame *fin = NULL;
445 int consumed = 0;
446 int ret = 0;
447
448 if (s->pts == AV_NOPTS_VALUE)
449 s->pts = in->pts - av_audio_fifo_size(s->fifo);
450
451 av_audio_fifo_write(s->fifo, (void **)in->extended_data, in->nb_samples);
452 while (av_audio_fifo_size(s->fifo) >= s->win_size) {
453 fin = ff_get_audio_buffer(inlink, s->win_size);
454 if (!fin) {
455 ret = AVERROR(ENOMEM);
456 goto fail;
457 }
458
459 fin->pts = s->pts + consumed;
460 consumed += s->hop_size;
461 ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size);
462 if (ret < 0)
463 goto fail;
464
465 ret = plot_freqs(inlink, fin);
466 av_frame_free(&fin);
467 av_audio_fifo_drain(s->fifo, s->hop_size);
468 if (ret < 0)
469 goto fail;
470 }
471
472fail:
473 s->pts = AV_NOPTS_VALUE;
474 av_frame_free(&fin);
475 av_frame_free(&in);
476 return ret;
477}
478
479static av_cold void uninit(AVFilterContext *ctx)
480{
481 ShowFreqsContext *s = ctx->priv;
482 int i;
483
484 av_fft_end(s->fft);
485 for (i = 0; i < s->nb_channels; i++) {
486 if (s->fft_data)
487 av_freep(&s->fft_data[i]);
488 if (s->avg_data)
489 av_freep(&s->avg_data[i]);
490 }
491 av_freep(&s->fft_data);
492 av_freep(&s->avg_data);
493 av_freep(&s->window_func_lut);
494 av_audio_fifo_free(s->fifo);
495}
496
497static const AVFilterPad showfreqs_inputs[] = {
498 {
499 .name = "default",
500 .type = AVMEDIA_TYPE_AUDIO,
501 .filter_frame = filter_frame,
502 },
503 { NULL }
504};
505
506static const AVFilterPad showfreqs_outputs[] = {
507 {
508 .name = "default",
509 .type = AVMEDIA_TYPE_VIDEO,
510 .config_props = config_output,
511 },
512 { NULL }
513};
514
515AVFilter ff_avf_showfreqs = {
516 .name = "showfreqs",
517 .description = NULL_IF_CONFIG_SMALL("Convert input audio to a frequencies video output."),
518 .init = init,
519 .uninit = uninit,
520 .query_formats = query_formats,
521 .priv_size = sizeof(ShowFreqsContext),
522 .inputs = showfreqs_inputs,
523 .outputs = showfreqs_outputs,
524 .priv_class = &showfreqs_class,
525};
526
generated by cgit at 2024-05-17 03:17:57 (GMT)