FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/avf_showfreqs.c
Date: 2026-09-26 14:26:21
Exec Total Coverage
Lines: 0 285 0.0%
Functions: 0 10 0.0%
Branches: 0 157 0.0%
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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/mem.h"
25 #include "libavutil/tx.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 "filters.h"
34 #include "formats.h"
35 #include "video.h"
36 #include "avfilter.h"
37 #include "window_func.h"
38
39 enum DataMode { MAGNITUDE, PHASE, DELAY, NB_DATA };
40 enum DisplayMode { LINE, BAR, DOT, NB_MODES };
41 enum ChannelMode { COMBINED, SEPARATE, NB_CMODES };
42 enum FrequencyScale { FS_LINEAR, FS_LOG, FS_RLOG, NB_FSCALES };
43 enum AmplitudeScale { AS_LINEAR, AS_SQRT, AS_CBRT, AS_LOG, NB_ASCALES };
44
45 typedef struct ShowFreqsContext {
46 const AVClass *class;
47 int w, h;
48 int mode;
49 int data_mode;
50 int cmode;
51 int fft_size;
52 int ascale, fscale;
53 int avg;
54 int win_func;
55 char *ch_layout_str;
56 uint8_t *bypass;
57 AVChannelLayout ch_layout;
58 AVTXContext *fft;
59 av_tx_fn tx_fn;
60 AVComplexFloat **fft_input;
61 AVComplexFloat **fft_data;
62 AVFrame *window;
63 float **avg_data;
64 float *window_func_lut;
65 float overlap;
66 float minamp;
67 int hop_size;
68 int nb_channels;
69 int nb_draw_channels;
70 int nb_freq;
71 int win_size;
72 float scale;
73 char *colors;
74 int64_t pts;
75 int64_t old_pts;
76 AVRational frame_rate;
77 } ShowFreqsContext;
78
79 #define OFFSET(x) offsetof(ShowFreqsContext, x)
80 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
81
82 static const AVOption showfreqs_options[] = {
83 { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS },
84 { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS },
85 { "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
86 { "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
87 { "mode", "set display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=BAR}, 0, NB_MODES-1, FLAGS, .unit = "mode" },
88 { "line", "show lines", 0, AV_OPT_TYPE_CONST, {.i64=LINE}, 0, 0, FLAGS, .unit = "mode" },
89 { "bar", "show bars", 0, AV_OPT_TYPE_CONST, {.i64=BAR}, 0, 0, FLAGS, .unit = "mode" },
90 { "dot", "show dots", 0, AV_OPT_TYPE_CONST, {.i64=DOT}, 0, 0, FLAGS, .unit = "mode" },
91 { "ascale", "set amplitude scale", OFFSET(ascale), AV_OPT_TYPE_INT, {.i64=AS_LOG}, 0, NB_ASCALES-1, FLAGS, .unit = "ascale" },
92 { "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=AS_LINEAR}, 0, 0, FLAGS, .unit = "ascale" },
93 { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=AS_SQRT}, 0, 0, FLAGS, .unit = "ascale" },
94 { "cbrt", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64=AS_CBRT}, 0, 0, FLAGS, .unit = "ascale" },
95 { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=AS_LOG}, 0, 0, FLAGS, .unit = "ascale" },
96 { "fscale", "set frequency scale", OFFSET(fscale), AV_OPT_TYPE_INT, {.i64=FS_LINEAR}, 0, NB_FSCALES-1, FLAGS, .unit = "fscale" },
97 { "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=FS_LINEAR}, 0, 0, FLAGS, .unit = "fscale" },
98 { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=FS_LOG}, 0, 0, FLAGS, .unit = "fscale" },
99 { "rlog", "reverse logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=FS_RLOG}, 0, 0, FLAGS, .unit = "fscale" },
100 { "win_size", "set window size", OFFSET(fft_size), AV_OPT_TYPE_INT, {.i64=2048}, 16, 65536, FLAGS },
101 WIN_FUNC_OPTION("win_func", OFFSET(win_func), FLAGS, WFUNC_HANNING),
102 { "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=1.}, 0., 1., FLAGS },
103 { "averaging", "set time averaging", OFFSET(avg), AV_OPT_TYPE_INT, {.i64=1}, 0, INT32_MAX, FLAGS },
104 { "colors", "set channels colors", OFFSET(colors), AV_OPT_TYPE_STRING, {.str = "red|green|blue|yellow|orange|lime|pink|magenta|brown" }, 0, 0, FLAGS },
105 { "cmode", "set channel mode", OFFSET(cmode), AV_OPT_TYPE_INT, {.i64=COMBINED}, 0, NB_CMODES-1, FLAGS, .unit = "cmode" },
106 { "combined", "show all channels in same window", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, .unit = "cmode" },
107 { "separate", "show each channel in own window", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, .unit = "cmode" },
108 { "minamp", "set minimum amplitude", OFFSET(minamp), AV_OPT_TYPE_FLOAT, {.dbl=1e-6}, FLT_MIN, 1e-6, FLAGS },
109 { "data", "set data mode", OFFSET(data_mode), AV_OPT_TYPE_INT, {.i64=MAGNITUDE}, 0, NB_DATA-1, FLAGS, .unit = "data" },
110 { "magnitude", "show magnitude", 0, AV_OPT_TYPE_CONST, {.i64=MAGNITUDE}, 0, 0, FLAGS, .unit = "data" },
111 { "phase", "show phase", 0, AV_OPT_TYPE_CONST, {.i64=PHASE}, 0, 0, FLAGS, .unit = "data" },
112 { "delay", "show group delay",0, AV_OPT_TYPE_CONST, {.i64=DELAY}, 0, 0, FLAGS, .unit = "data" },
113 { "channels", "set channels to draw", OFFSET(ch_layout_str), AV_OPT_TYPE_STRING, {.str="all"}, 0, 0, FLAGS },
114 { NULL }
115 };
116
117 AVFILTER_DEFINE_CLASS(showfreqs);
118
119 ✗ static int query_formats(const AVFilterContext *ctx,
120 AVFilterFormatsConfig **cfg_in,
121 AVFilterFormatsConfig **cfg_out)
122 {
123 ✗ AVFilterFormats *formats = NULL;
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_sample_format_list(sample_fmts);
130 ✗ if ((ret = ff_formats_ref(formats, &cfg_in[0]->formats)) < 0)
131 ✗ return ret;
132
133 /* set output video format */
134 ✗ formats = ff_make_pixel_format_list(pix_fmts);
135 ✗ if ((ret = ff_formats_ref(formats, &cfg_out[0]->formats)) < 0)
136 ✗ return ret;
137
138 ✗ return 0;
139 }
140
141 ✗ static int config_output(AVFilterLink *outlink)
142 {
143 ✗ FilterLink *l = ff_filter_link(outlink);
144 ✗ AVFilterContext *ctx = outlink->src;
145 ✗ AVFilterLink *inlink = ctx->inputs[0];
146 ✗ ShowFreqsContext *s = ctx->priv;
147 ✗ float overlap, scale = 1.f;
148 int i, ret;
149
150 ✗ s->old_pts = AV_NOPTS_VALUE;
151 ✗ s->nb_freq = s->fft_size / 2;
152 ✗ s->win_size = s->fft_size;
153 ✗ av_tx_uninit(&s->fft);
154 ✗ ret = av_tx_init(&s->fft, &s->tx_fn, AV_TX_FLOAT_FFT, 0, s->fft_size, &scale, 0);
155 ✗ if (ret < 0) {
156 ✗ av_log(ctx, AV_LOG_ERROR, "Unable to create FFT context. "
157 "The window size might be too high.\n");
158 ✗ return ret;
159 }
160
161 /* FFT buffers: x2 for each (display) channel buffer.
162 * Note: we use free and malloc instead of a realloc-like function to
163 * make sure the buffer is aligned in memory for the FFT functions. */
164 ✗ for (i = 0; i < s->nb_channels; i++) {
165 ✗ av_freep(&s->fft_input[i]);
166 ✗ av_freep(&s->fft_data[i]);
167 ✗ av_freep(&s->avg_data[i]);
168 }
169 ✗ av_freep(&s->bypass);
170 ✗ av_freep(&s->fft_input);
171 ✗ av_freep(&s->fft_data);
172 ✗ av_freep(&s->avg_data);
173 ✗ s->nb_channels = inlink->ch_layout.nb_channels;
174
175 ✗ s->bypass = av_calloc(s->nb_channels, sizeof(*s->bypass));
176 ✗ if (!s->bypass)
177 ✗ return AVERROR(ENOMEM);
178 ✗ s->fft_input = av_calloc(s->nb_channels, sizeof(*s->fft_input));
179 ✗ if (!s->fft_input)
180 ✗ return AVERROR(ENOMEM);
181 ✗ s->fft_data = av_calloc(s->nb_channels, sizeof(*s->fft_data));
182 ✗ if (!s->fft_data)
183 ✗ return AVERROR(ENOMEM);
184 ✗ s->avg_data = av_calloc(s->nb_channels, sizeof(*s->avg_data));
185 ✗ if (!s->avg_data)
186 ✗ return AVERROR(ENOMEM);
187 ✗ for (i = 0; i < s->nb_channels; i++) {
188 ✗ s->fft_input[i] = av_calloc(FFALIGN(s->win_size, 512), sizeof(**s->fft_input));
189 ✗ s->fft_data[i] = av_calloc(FFALIGN(s->win_size, 512), sizeof(**s->fft_data));
190 ✗ s->avg_data[i] = av_calloc(s->nb_freq, sizeof(**s->avg_data));
191 ✗ if (!s->fft_data[i] || !s->avg_data[i] || !s->fft_input[i])
192 ✗ return AVERROR(ENOMEM);
193 }
194
195 /* pre-calc windowing function */
196 ✗ s->window_func_lut = av_realloc_f(s->window_func_lut, s->win_size,
197 sizeof(*s->window_func_lut));
198 ✗ if (!s->window_func_lut)
199 ✗ return AVERROR(ENOMEM);
200 ✗ generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap);
201 ✗ if (s->overlap == 1.)
202 ✗ s->overlap = overlap;
203 ✗ s->hop_size = (1. - s->overlap) * s->win_size;
204 ✗ if (s->hop_size < 1) {
205 ✗ av_log(ctx, AV_LOG_ERROR, "overlap %f too big\n", s->overlap);
206 ✗ return AVERROR(EINVAL);
207 }
208
209 ✗ for (s->scale = 0, i = 0; i < s->win_size; i++) {
210 ✗ s->scale += s->window_func_lut[i] * s->window_func_lut[i];
211 }
212
213 ✗ s->window = ff_get_audio_buffer(inlink, s->win_size * 2);
214 ✗ if (!s->window)
215 ✗ return AVERROR(ENOMEM);
216
217 ✗ l->frame_rate = s->frame_rate;
218 ✗ outlink->time_base = av_inv_q(l->frame_rate);
219 ✗ outlink->sample_aspect_ratio = (AVRational){1,1};
220 ✗ outlink->w = s->w;
221 ✗ outlink->h = s->h;
222
223 ✗ ret = av_channel_layout_copy(&s->ch_layout, &inlink->ch_layout);
224 ✗ if (ret < 0)
225 ✗ return ret;
226 ✗ s->nb_draw_channels = s->nb_channels;
227
228 ✗ if (strcmp(s->ch_layout_str, "all")) {
229 ✗ int nb_draw_channels = 0;
230 ✗ av_channel_layout_from_string(&s->ch_layout,
231 ✗ s->ch_layout_str);
232
233 ✗ for (int ch = 0; ch < s->nb_channels; ch++) {
234 ✗ const enum AVChannel channel = av_channel_layout_channel_from_index(&inlink->ch_layout, ch);
235
236 ✗ s->bypass[ch] = av_channel_layout_index_from_channel(&s->ch_layout, channel) < 0;
237 ✗ nb_draw_channels += s->bypass[ch] == 0;
238 }
239
240 ✗ s->nb_draw_channels = nb_draw_channels;
241 }
242
243 ✗ return 0;
244 }
245
246 ✗ static inline void draw_dot(AVFrame *out, int x, int y, uint8_t fg[4])
247 {
248
249 ✗ uint32_t color = AV_RL32(out->data[0] + y * out->linesize[0] + x * 4);
250
251 ✗ if ((color & 0xffffff) != 0)
252 ✗ AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg) | color);
253 else
254 ✗ AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg));
255 ✗ }
256
257 ✗ static int get_sx(ShowFreqsContext *s, int f)
258 {
259 ✗ switch (s->fscale) {
260 ✗ case FS_LINEAR:
261 ✗ return (s->w/(float)s->nb_freq)*f;
262 ✗ case FS_LOG:
263 ✗ return s->w-pow(s->w, (s->nb_freq-f-1)/(s->nb_freq-1.));
264 ✗ case FS_RLOG:
265 ✗ return pow(s->w, f/(s->nb_freq-1.));
266 }
267
268 ✗ return 0;
269 }
270
271 ✗ static float get_bsize(ShowFreqsContext *s, int f)
272 {
273 ✗ switch (s->fscale) {
274 ✗ case FS_LINEAR:
275 ✗ return s->w/(float)s->nb_freq;
276 ✗ case FS_LOG:
277 ✗ return pow(s->w, (s->nb_freq-f-1)/(s->nb_freq-1.))-
278 ✗ pow(s->w, (s->nb_freq-f-2)/(s->nb_freq-1.));
279 ✗ case FS_RLOG:
280 ✗ return pow(s->w, (f+1)/(s->nb_freq-1.))-
281 ✗ pow(s->w, f /(s->nb_freq-1.));
282 }
283
284 ✗ return 1.;
285 }
286
287 ✗ static inline void plot_freq(ShowFreqsContext *s, int ch,
288 double a, int f, uint8_t fg[4], int *prev_y,
289 AVFrame *out, AVFilterLink *outlink)
290 {
291 ✗ FilterLink *outl = ff_filter_link(outlink);
292 ✗ const int w = s->w;
293 ✗ const float min = s->minamp;
294 ✗ const float avg = s->avg_data[ch][f];
295 ✗ const float bsize = get_bsize(s, f);
296 ✗ const int sx = get_sx(s, f);
297 ✗ int end = outlink->h;
298 int x, y, i;
299
300 ✗ switch(s->ascale) {
301 ✗ case AS_SQRT:
302 ✗ a = 1.0 - sqrt(a);
303 ✗ break;
304 ✗ case AS_CBRT:
305 ✗ a = 1.0 - cbrt(a);
306 ✗ break;
307 ✗ case AS_LOG:
308 ✗ a = log(av_clipd(a, min, 1)) / log(min);
309 ✗ break;
310 ✗ case AS_LINEAR:
311 ✗ a = 1.0 - a;
312 ✗ break;
313 }
314
315 ✗ switch (s->cmode) {
316 ✗ case COMBINED:
317 ✗ y = a * outlink->h - 1;
318 ✗ break;
319 ✗ case SEPARATE:
320 ✗ end = (outlink->h / s->nb_draw_channels) * (ch + 1);
321 ✗ y = (outlink->h / s->nb_draw_channels) * ch + a * (outlink->h / s->nb_draw_channels) - 1;
322 ✗ break;
323 ✗ default:
324 ✗ av_assert0(0);
325 }
326 ✗ if (y < 0)
327 ✗ return;
328
329 ✗ switch (s->avg) {
330 ✗ case 0:
331 ✗ y = s->avg_data[ch][f] = !outl->frame_count_in ? y : FFMIN(0, y);
332 ✗ break;
333 ✗ case 1:
334 ✗ break;
335 ✗ default:
336 ✗ s->avg_data[ch][f] = avg + y * (y - avg) / (FFMIN(outl->frame_count_in + 1, s->avg) * (float)y);
337 ✗ y = av_clip(s->avg_data[ch][f], 0, outlink->h - 1);
338 ✗ break;
339 }
340
341 ✗ switch(s->mode) {
342 ✗ case LINE:
343 ✗ if (*prev_y == -1) {
344 ✗ *prev_y = y;
345 }
346 ✗ if (y <= *prev_y) {
347 ✗ for (x = sx + 1; x < sx + bsize && x < w; x++)
348 ✗ draw_dot(out, x, y, fg);
349 ✗ for (i = y; i <= *prev_y; i++)
350 ✗ draw_dot(out, sx, i, fg);
351 } else {
352 ✗ for (i = *prev_y; i <= y; i++)
353 ✗ draw_dot(out, sx, i, fg);
354 ✗ for (x = sx + 1; x < sx + bsize && x < w; x++)
355 ✗ draw_dot(out, x, i - 1, fg);
356 }
357 ✗ *prev_y = y;
358 ✗ break;
359 ✗ case BAR:
360 ✗ for (x = sx; x < sx + bsize && x < w; x++)
361 ✗ for (i = y; i < end; i++)
362 ✗ draw_dot(out, x, i, fg);
363 ✗ break;
364 ✗ case DOT:
365 ✗ for (x = sx; x < sx + bsize && x < w; x++)
366 ✗ draw_dot(out, x, y, fg);
367 ✗ break;
368 }
369 }
370
371 ✗ static int plot_freqs(AVFilterLink *inlink, int64_t pts)
372 {
373 ✗ AVFilterContext *ctx = inlink->dst;
374 ✗ AVFilterLink *outlink = ctx->outputs[0];
375 ✗ ShowFreqsContext *s = ctx->priv;
376 ✗ AVFrame *in = s->window;
377 ✗ const int win_size = s->win_size;
378 ✗ char *colors, *color, *saveptr = NULL;
379 AVFrame *out;
380 int ch, n;
381
382 /* fill FFT input with the number of samples available */
383 ✗ for (ch = 0; ch < s->nb_channels; ch++) {
384 ✗ const float *p = (float *)in->extended_data[ch];
385
386 ✗ if (s->bypass[ch])
387 ✗ continue;
388
389 ✗ for (n = 0; n < win_size; n++) {
390 ✗ s->fft_input[ch][n].re = p[n] * s->window_func_lut[n];
391 ✗ s->fft_input[ch][n].im = 0;
392 }
393 }
394
395 /* run FFT on each samples set */
396 ✗ for (ch = 0; ch < s->nb_channels; ch++) {
397 ✗ if (s->bypass[ch])
398 ✗ continue;
399
400 ✗ s->tx_fn(s->fft, s->fft_data[ch], s->fft_input[ch], sizeof(AVComplexFloat));
401 }
402
403 ✗ s->pts = av_rescale_q(pts, inlink->time_base, outlink->time_base);
404 ✗ if (s->old_pts >= s->pts)
405 ✗ return 0;
406 ✗ s->old_pts = s->pts;
407
408 #define RE(x, ch) s->fft_data[ch][x].re
409 #define IM(x, ch) s->fft_data[ch][x].im
410 #define M(a, b) (sqrt((a) * (a) + (b) * (b)))
411 #define P(a, b) (atan2((b), (a)))
412
413 ✗ colors = av_strdup(s->colors);
414 ✗ if (!colors)
415 ✗ return AVERROR(ENOMEM);
416
417 ✗ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
418 ✗ if (!out) {
419 ✗ av_free(colors);
420 ✗ return AVERROR(ENOMEM);
421 }
422
423 ✗ for (n = 0; n < outlink->h; n++)
424 ✗ memset(out->data[0] + out->linesize[0] * n, 0, outlink->w * 4);
425
426 ✗ for (ch = 0; ch < s->nb_channels; ch++) {
427 ✗ uint8_t fg[4] = { 0xff, 0xff, 0xff, 0xff };
428 ✗ int prev_y = -1, f;
429 double a;
430
431 ✗ color = av_strtok(ch == 0 ? colors : NULL, " |", &saveptr);
432 ✗ if (color)
433 ✗ av_parse_color(fg, color, -1, ctx);
434
435 ✗ if (s->bypass[ch])
436 ✗ continue;
437
438 ✗ switch (s->data_mode) {
439 ✗ case MAGNITUDE:
440 ✗ for (f = 0; f < s->nb_freq; f++) {
441 ✗ a = av_clipd(M(RE(f, ch), IM(f, ch)) / s->scale, 0, 1);
442
443 ✗ plot_freq(s, ch, a, f, fg, &prev_y, out, outlink);
444 }
445 ✗ break;
446 ✗ case PHASE:
447 ✗ for (f = 0; f < s->nb_freq; f++) {
448 ✗ a = av_clipd((M_PI + P(RE(f, ch), IM(f, ch))) / (2. * M_PI), 0, 1);
449
450 ✗ plot_freq(s, ch, a, f, fg, &prev_y, out, outlink);
451 }
452 ✗ break;
453 ✗ case DELAY:
454 ✗ for (f = 0; f < s->nb_freq; f++) {
455 ✗ a = av_clipd((M_PI - P(IM(f, ch) * RE(f-1, ch) - IM(f-1, ch) * RE(f, ch),
456 RE(f, ch) * RE(f-1, ch) + IM(f, ch) * IM(f-1, ch))) / (2. * M_PI), 0, 1);
457
458 ✗ plot_freq(s, ch, a, f, fg, &prev_y, out, outlink);
459 }
460 ✗ break;
461 }
462 }
463
464 ✗ av_free(colors);
465 ✗ out->pts = s->pts;
466 ✗ out->duration = 1;
467 ✗ out->sample_aspect_ratio = (AVRational){1,1};
468 ✗ return ff_filter_frame(outlink, out);
469 }
470
471 ✗ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
472 {
473 ✗ AVFilterContext *ctx = inlink->dst;
474 ✗ ShowFreqsContext *s = ctx->priv;
475 ✗ const int offset = s->win_size - s->hop_size;
476 ✗ int64_t pts = in->pts;
477
478 ✗ for (int ch = 0; ch < in->ch_layout.nb_channels; ch++) {
479 ✗ float *dst = (float *)s->window->extended_data[ch];
480
481 ✗ memmove(dst, &dst[s->hop_size], offset * sizeof(float));
482 ✗ memcpy(&dst[offset], in->extended_data[ch], in->nb_samples * sizeof(float));
483 ✗ memset(&dst[offset + in->nb_samples], 0, (s->hop_size - in->nb_samples) * sizeof(float));
484 }
485
486 ✗ av_frame_free(&in);
487
488 ✗ return plot_freqs(inlink, pts);
489 }
490
491 ✗ static int activate(AVFilterContext *ctx)
492 {
493 ✗ AVFilterLink *inlink = ctx->inputs[0];
494 ✗ AVFilterLink *outlink = ctx->outputs[0];
495 ✗ ShowFreqsContext *s = ctx->priv;
496 AVFrame *in;
497 int ret;
498
499 ✗ FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
500
501 ✗ ret = ff_inlink_consume_samples(inlink, s->hop_size, s->hop_size, &in);
502 ✗ if (ret < 0)
503 ✗ return ret;
504
505 ✗ if (ret > 0)
506 ✗ ret = filter_frame(inlink, in);
507 ✗ if (ret < 0)
508 ✗ return ret;
509
510 ✗ if (ff_inlink_queued_samples(inlink) >= s->hop_size) {
511 ✗ ff_filter_set_ready(ctx, 10);
512 ✗ return 0;
513 }
514
515 ✗ FF_FILTER_FORWARD_STATUS(inlink, outlink);
516 ✗ FF_FILTER_FORWARD_WANTED(outlink, inlink);
517
518 ✗ return FFERROR_NOT_READY;
519 }
520
521 ✗ static av_cold void uninit(AVFilterContext *ctx)
522 {
523 ✗ ShowFreqsContext *s = ctx->priv;
524 int i;
525
526 ✗ av_channel_layout_uninit(&s->ch_layout);
527 ✗ av_tx_uninit(&s->fft);
528 ✗ for (i = 0; i < s->nb_channels; i++) {
529 ✗ if (s->fft_input)
530 ✗ av_freep(&s->fft_input[i]);
531 ✗ if (s->fft_data)
532 ✗ av_freep(&s->fft_data[i]);
533 ✗ if (s->avg_data)
534 ✗ av_freep(&s->avg_data[i]);
535 }
536 ✗ av_freep(&s->bypass);
537 ✗ av_freep(&s->fft_input);
538 ✗ av_freep(&s->fft_data);
539 ✗ av_freep(&s->avg_data);
540 ✗ av_freep(&s->window_func_lut);
541 ✗ av_frame_free(&s->window);
542 ✗ }
543
544 static const AVFilterPad showfreqs_outputs[] = {
545 {
546 .name = "default",
547 .type = AVMEDIA_TYPE_VIDEO,
548 .config_props = config_output,
549 },
550 };
551
552 const FFFilter ff_avf_showfreqs = {
553 .p.name = "showfreqs",
554 .p.description = NULL_IF_CONFIG_SMALL("Convert input audio to a frequencies video output."),
555 .p.priv_class = &showfreqs_class,
556 .uninit = uninit,
557 .priv_size = sizeof(ShowFreqsContext),
558 .activate = activate,
559 FILTER_INPUTS(ff_audio_default_filterpad),
560 FILTER_OUTPUTS(showfreqs_outputs),
561 FILTER_QUERY_FUNC2(query_formats),
562 };
563