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 "filters.h"
34 #include "video.h"
35 #include "avfilter.h"
36 #include "internal.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 fft_bits;
53 int ascale, fscale;
54 int avg;
55 int win_func;
56 FFTContext *fft;
57 FFTComplex **fft_data;
58 float **avg_data;
59 float *window_func_lut;
60 float overlap;
61 float minamp;
62 int hop_size;
63 int nb_channels;
64 int nb_freq;
65 int win_size;
66 float scale;
67 char *colors;
68 AVAudioFifo *fifo;
69 int64_t pts;
70 } ShowFreqsContext;
71
72 #define OFFSET(x) offsetof(ShowFreqsContext, x)
73 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
74
75 static const AVOption showfreqs_options[] = {
76 { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS },
77 { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS },
78 { "mode", "set display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=BAR}, 0, NB_MODES-1, FLAGS, "mode" },
79 { "line", "show lines", 0, AV_OPT_TYPE_CONST, {.i64=LINE}, 0, 0, FLAGS, "mode" },
80 { "bar", "show bars", 0, AV_OPT_TYPE_CONST, {.i64=BAR}, 0, 0, FLAGS, "mode" },
81 { "dot", "show dots", 0, AV_OPT_TYPE_CONST, {.i64=DOT}, 0, 0, FLAGS, "mode" },
82 { "ascale", "set amplitude scale", OFFSET(ascale), AV_OPT_TYPE_INT, {.i64=AS_LOG}, 0, NB_ASCALES-1, FLAGS, "ascale" },
83 { "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=AS_LINEAR}, 0, 0, FLAGS, "ascale" },
84 { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=AS_SQRT}, 0, 0, FLAGS, "ascale" },
85 { "cbrt", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64=AS_CBRT}, 0, 0, FLAGS, "ascale" },
86 { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=AS_LOG}, 0, 0, FLAGS, "ascale" },
87 { "fscale", "set frequency scale", OFFSET(fscale), AV_OPT_TYPE_INT, {.i64=FS_LINEAR}, 0, NB_FSCALES-1, FLAGS, "fscale" },
88 { "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=FS_LINEAR}, 0, 0, FLAGS, "fscale" },
89 { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=FS_LOG}, 0, 0, FLAGS, "fscale" },
90 { "rlog", "reverse logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=FS_RLOG}, 0, 0, FLAGS, "fscale" },
91 { "win_size", "set window size", OFFSET(fft_size), AV_OPT_TYPE_INT, {.i64=2048}, 16, 65536, FLAGS },
92 { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64=WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" },
93 { "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, FLAGS, "win_func" },
94 { "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" },
95 { "hanning", "Hanning", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" },
96 { "hamming", "Hamming", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING}, 0, 0, FLAGS, "win_func" },
97 { "blackman", "Blackman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },
98 { "welch", "Welch", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH}, 0, 0, FLAGS, "win_func" },
99 { "flattop", "Flat-top", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP}, 0, 0, FLAGS, "win_func" },
100 { "bharris", "Blackman-Harris", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS}, 0, 0, FLAGS, "win_func" },
101 { "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" },
102 { "bhann", "Bartlett-Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN}, 0, 0, FLAGS, "win_func" },
103 { "sine", "Sine", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE}, 0, 0, FLAGS, "win_func" },
104 { "nuttall", "Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL}, 0, 0, FLAGS, "win_func" },
105 { "lanczos", "Lanczos", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS}, 0, 0, FLAGS, "win_func" },
106 { "gauss", "Gauss", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS}, 0, 0, FLAGS, "win_func" },
107 { "tukey", "Tukey", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY}, 0, 0, FLAGS, "win_func" },
108 { "dolph", "Dolph-Chebyshev", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH}, 0, 0, FLAGS, "win_func" },
109 { "cauchy", "Cauchy", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY}, 0, 0, FLAGS, "win_func" },
110 { "parzen", "Parzen", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN}, 0, 0, FLAGS, "win_func" },
111 { "poisson", "Poisson", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON}, 0, 0, FLAGS, "win_func" },
112 { "bohman", "Bohman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BOHMAN} , 0, 0, FLAGS, "win_func" },
113 { "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=1.}, 0., 1., FLAGS },
114 { "averaging", "set time averaging", OFFSET(avg), AV_OPT_TYPE_INT, {.i64=1}, 0, INT32_MAX, FLAGS },
115 { "colors", "set channels colors", OFFSET(colors), AV_OPT_TYPE_STRING, {.str = "red|green|blue|yellow|orange|lime|pink|magenta|brown" }, 0, 0, FLAGS },
116 { "cmode", "set channel mode", OFFSET(cmode), AV_OPT_TYPE_INT, {.i64=COMBINED}, 0, NB_CMODES-1, FLAGS, "cmode" },
117 { "combined", "show all channels in same window", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "cmode" },
118 { "separate", "show each channel in own window", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "cmode" },
119 { "minamp", "set minimum amplitude", OFFSET(minamp), AV_OPT_TYPE_FLOAT, {.dbl=1e-6}, FLT_MIN, 1e-6, FLAGS },
120 { "data", "set data mode", OFFSET(data_mode), AV_OPT_TYPE_INT, {.i64=MAGNITUDE}, 0, NB_DATA-1, FLAGS, "data" },
121 { "magnitude", "show magnitude", 0, AV_OPT_TYPE_CONST, {.i64=MAGNITUDE}, 0, 0, FLAGS, "data" },
122 { "phase", "show phase", 0, AV_OPT_TYPE_CONST, {.i64=PHASE}, 0, 0, FLAGS, "data" },
123 { "delay", "show group delay",0, AV_OPT_TYPE_CONST, {.i64=DELAY}, 0, 0, FLAGS, "data" },
124 { NULL }
125 };
126
127 AVFILTER_DEFINE_CLASS(showfreqs);
128
query_formats(AVFilterContext * ctx)129 static int query_formats(AVFilterContext *ctx)
130 {
131 AVFilterFormats *formats = NULL;
132 AVFilterChannelLayouts *layouts = NULL;
133 AVFilterLink *inlink = ctx->inputs[0];
134 AVFilterLink *outlink = ctx->outputs[0];
135 static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE };
136 static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
137 int ret;
138
139 /* set input audio formats */
140 formats = ff_make_format_list(sample_fmts);
141 if ((ret = ff_formats_ref(formats, &inlink->outcfg.formats)) < 0)
142 return ret;
143
144 layouts = ff_all_channel_layouts();
145 if ((ret = ff_channel_layouts_ref(layouts, &inlink->outcfg.channel_layouts)) < 0)
146 return ret;
147
148 formats = ff_all_samplerates();
149 if ((ret = ff_formats_ref(formats, &inlink->outcfg.samplerates)) < 0)
150 return ret;
151
152 /* set output video format */
153 formats = ff_make_format_list(pix_fmts);
154 if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0)
155 return ret;
156
157 return 0;
158 }
159
init(AVFilterContext * ctx)160 static av_cold int init(AVFilterContext *ctx)
161 {
162 ShowFreqsContext *s = ctx->priv;
163
164 s->pts = AV_NOPTS_VALUE;
165
166 return 0;
167 }
168
config_output(AVFilterLink * outlink)169 static int config_output(AVFilterLink *outlink)
170 {
171 AVFilterContext *ctx = outlink->src;
172 AVFilterLink *inlink = ctx->inputs[0];
173 ShowFreqsContext *s = ctx->priv;
174 float overlap;
175 int i;
176
177 s->fft_bits = av_log2(s->fft_size);
178 s->nb_freq = 1 << (s->fft_bits - 1);
179 s->win_size = s->nb_freq << 1;
180 av_audio_fifo_free(s->fifo);
181 av_fft_end(s->fft);
182 s->fft = av_fft_init(s->fft_bits, 0);
183 if (!s->fft) {
184 av_log(ctx, AV_LOG_ERROR, "Unable to create FFT context. "
185 "The window size might be too high.\n");
186 return AVERROR(ENOMEM);
187 }
188
189 /* FFT buffers: x2 for each (display) channel buffer.
190 * Note: we use free and malloc instead of a realloc-like function to
191 * make sure the buffer is aligned in memory for the FFT functions. */
192 for (i = 0; i < s->nb_channels; i++) {
193 av_freep(&s->fft_data[i]);
194 av_freep(&s->avg_data[i]);
195 }
196 av_freep(&s->fft_data);
197 av_freep(&s->avg_data);
198 s->nb_channels = inlink->channels;
199
200 s->fft_data = av_calloc(s->nb_channels, sizeof(*s->fft_data));
201 if (!s->fft_data)
202 return AVERROR(ENOMEM);
203 s->avg_data = av_calloc(s->nb_channels, sizeof(*s->avg_data));
204 if (!s->avg_data)
205 return AVERROR(ENOMEM);
206 for (i = 0; i < s->nb_channels; i++) {
207 s->fft_data[i] = av_calloc(s->win_size, sizeof(**s->fft_data));
208 s->avg_data[i] = av_calloc(s->nb_freq, sizeof(**s->avg_data));
209 if (!s->fft_data[i] || !s->avg_data[i])
210 return AVERROR(ENOMEM);
211 }
212
213 /* pre-calc windowing function */
214 s->window_func_lut = av_realloc_f(s->window_func_lut, s->win_size,
215 sizeof(*s->window_func_lut));
216 if (!s->window_func_lut)
217 return AVERROR(ENOMEM);
218 generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap);
219 if (s->overlap == 1.)
220 s->overlap = overlap;
221 s->hop_size = (1. - s->overlap) * s->win_size;
222 if (s->hop_size < 1) {
223 av_log(ctx, AV_LOG_ERROR, "overlap %f too big\n", s->overlap);
224 return AVERROR(EINVAL);
225 }
226
227 for (s->scale = 0, i = 0; i < s->win_size; i++) {
228 s->scale += s->window_func_lut[i] * s->window_func_lut[i];
229 }
230
231 outlink->frame_rate = av_make_q(inlink->sample_rate, s->win_size * (1.-s->overlap));
232 outlink->sample_aspect_ratio = (AVRational){1,1};
233 outlink->w = s->w;
234 outlink->h = s->h;
235
236 s->fifo = av_audio_fifo_alloc(inlink->format, inlink->channels, s->win_size);
237 if (!s->fifo)
238 return AVERROR(ENOMEM);
239 return 0;
240 }
241
draw_dot(AVFrame * out,int x,int y,uint8_t fg[4])242 static inline void draw_dot(AVFrame *out, int x, int y, uint8_t fg[4])
243 {
244
245 uint32_t color = AV_RL32(out->data[0] + y * out->linesize[0] + x * 4);
246
247 if ((color & 0xffffff) != 0)
248 AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg) | color);
249 else
250 AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg));
251 }
252
get_sx(ShowFreqsContext * s,int f)253 static int get_sx(ShowFreqsContext *s, int f)
254 {
255 switch (s->fscale) {
256 case FS_LINEAR:
257 return (s->w/(float)s->nb_freq)*f;
258 case FS_LOG:
259 return s->w-pow(s->w, (s->nb_freq-f-1)/(s->nb_freq-1.));
260 case FS_RLOG:
261 return pow(s->w, f/(s->nb_freq-1.));
262 }
263
264 return 0;
265 }
266
get_bsize(ShowFreqsContext * s,int f)267 static float get_bsize(ShowFreqsContext *s, int f)
268 {
269 switch (s->fscale) {
270 case FS_LINEAR:
271 return s->w/(float)s->nb_freq;
272 case FS_LOG:
273 return pow(s->w, (s->nb_freq-f-1)/(s->nb_freq-1.))-
274 pow(s->w, (s->nb_freq-f-2)/(s->nb_freq-1.));
275 case FS_RLOG:
276 return pow(s->w, (f+1)/(s->nb_freq-1.))-
277 pow(s->w, f /(s->nb_freq-1.));
278 }
279
280 return 1.;
281 }
282
plot_freq(ShowFreqsContext * s,int ch,double a,int f,uint8_t fg[4],int * prev_y,AVFrame * out,AVFilterLink * outlink)283 static inline void plot_freq(ShowFreqsContext *s, int ch,
284 double a, int f, uint8_t fg[4], int *prev_y,
285 AVFrame *out, AVFilterLink *outlink)
286 {
287 const int w = s->w;
288 const float min = s->minamp;
289 const float avg = s->avg_data[ch][f];
290 const float bsize = get_bsize(s, f);
291 const int sx = get_sx(s, f);
292 int end = outlink->h;
293 int x, y, i;
294
295 switch(s->ascale) {
296 case AS_SQRT:
297 a = 1.0 - sqrt(a);
298 break;
299 case AS_CBRT:
300 a = 1.0 - cbrt(a);
301 break;
302 case AS_LOG:
303 a = log(av_clipd(a, min, 1)) / log(min);
304 break;
305 case AS_LINEAR:
306 a = 1.0 - a;
307 break;
308 }
309
310 switch (s->cmode) {
311 case COMBINED:
312 y = a * outlink->h - 1;
313 break;
314 case SEPARATE:
315 end = (outlink->h / s->nb_channels) * (ch + 1);
316 y = (outlink->h / s->nb_channels) * ch + a * (outlink->h / s->nb_channels) - 1;
317 break;
318 default:
319 av_assert0(0);
320 }
321 if (y < 0)
322 return;
323
324 switch (s->avg) {
325 case 0:
326 y = s->avg_data[ch][f] = !outlink->frame_count_in ? y : FFMIN(avg, y);
327 break;
328 case 1:
329 break;
330 default:
331 s->avg_data[ch][f] = avg + y * (y - avg) / (FFMIN(outlink->frame_count_in + 1, s->avg) * y);
332 y = s->avg_data[ch][f];
333 break;
334 }
335
336 switch(s->mode) {
337 case LINE:
338 if (*prev_y == -1) {
339 *prev_y = y;
340 }
341 if (y <= *prev_y) {
342 for (x = sx + 1; x < sx + bsize && x < w; x++)
343 draw_dot(out, x, y, fg);
344 for (i = y; i <= *prev_y; i++)
345 draw_dot(out, sx, i, fg);
346 } else {
347 for (i = *prev_y; i <= y; i++)
348 draw_dot(out, sx, i, fg);
349 for (x = sx + 1; x < sx + bsize && x < w; x++)
350 draw_dot(out, x, i - 1, fg);
351 }
352 *prev_y = y;
353 break;
354 case BAR:
355 for (x = sx; x < sx + bsize && x < w; x++)
356 for (i = y; i < end; i++)
357 draw_dot(out, x, i, fg);
358 break;
359 case DOT:
360 for (x = sx; x < sx + bsize && x < w; x++)
361 draw_dot(out, x, y, fg);
362 break;
363 }
364 }
365
plot_freqs(AVFilterLink * inlink,AVFrame * in)366 static int plot_freqs(AVFilterLink *inlink, AVFrame *in)
367 {
368 AVFilterContext *ctx = inlink->dst;
369 AVFilterLink *outlink = ctx->outputs[0];
370 ShowFreqsContext *s = ctx->priv;
371 const int win_size = s->win_size;
372 char *colors, *color, *saveptr = NULL;
373 AVFrame *out;
374 int ch, n;
375
376 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
377 if (!out)
378 return AVERROR(ENOMEM);
379
380 for (n = 0; n < outlink->h; n++)
381 memset(out->data[0] + out->linesize[0] * n, 0, outlink->w * 4);
382
383 /* fill FFT input with the number of samples available */
384 for (ch = 0; ch < s->nb_channels; ch++) {
385 const float *p = (float *)in->extended_data[ch];
386
387 for (n = 0; n < in->nb_samples; n++) {
388 s->fft_data[ch][n].re = p[n] * s->window_func_lut[n];
389 s->fft_data[ch][n].im = 0;
390 }
391 for (; n < win_size; n++) {
392 s->fft_data[ch][n].re = 0;
393 s->fft_data[ch][n].im = 0;
394 }
395 }
396
397 /* run FFT on each samples set */
398 for (ch = 0; ch < s->nb_channels; ch++) {
399 av_fft_permute(s->fft, s->fft_data[ch]);
400 av_fft_calc(s->fft, s->fft_data[ch]);
401 }
402
403 #define RE(x, ch) s->fft_data[ch][x].re
404 #define IM(x, ch) s->fft_data[ch][x].im
405 #define M(a, b) (sqrt((a) * (a) + (b) * (b)))
406 #define P(a, b) (atan2((b), (a)))
407
408 colors = av_strdup(s->colors);
409 if (!colors) {
410 av_frame_free(&out);
411 return AVERROR(ENOMEM);
412 }
413
414 for (ch = 0; ch < s->nb_channels; ch++) {
415 uint8_t fg[4] = { 0xff, 0xff, 0xff, 0xff };
416 int prev_y = -1, f;
417 double a;
418
419 color = av_strtok(ch == 0 ? colors : NULL, " |", &saveptr);
420 if (color)
421 av_parse_color(fg, color, -1, ctx);
422
423 switch (s->data_mode) {
424 case MAGNITUDE:
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 break;
434 case PHASE:
435 a = av_clipd((M_PI + P(RE(0, ch), 0)) / (2. * M_PI), 0, 1);
436 plot_freq(s, ch, a, 0, fg, &prev_y, out, outlink);
437
438 for (f = 1; f < s->nb_freq; f++) {
439 a = av_clipd((M_PI + P(RE(f, ch), IM(f, ch))) / (2. * M_PI), 0, 1);
440
441 plot_freq(s, ch, a, f, fg, &prev_y, out, outlink);
442 }
443 break;
444 case DELAY:
445 plot_freq(s, ch, 0, 0, fg, &prev_y, out, outlink);
446
447 for (f = 1; f < s->nb_freq; f++) {
448 a = av_clipd((M_PI - P(IM(f, ch) * RE(f-1, ch) - IM(f-1, ch) * RE(f, ch),
449 RE(f, ch) * RE(f-1, ch) + IM(f, ch) * IM(f-1, ch))) / (2. * M_PI), 0, 1);
450
451 plot_freq(s, ch, a, f, fg, &prev_y, out, outlink);
452 }
453 break;
454 }
455 }
456
457 av_free(colors);
458 out->pts = in->pts;
459 out->sample_aspect_ratio = (AVRational){1,1};
460 return ff_filter_frame(outlink, out);
461 }
462
filter_frame(AVFilterLink * inlink)463 static int filter_frame(AVFilterLink *inlink)
464 {
465 AVFilterContext *ctx = inlink->dst;
466 ShowFreqsContext *s = ctx->priv;
467 AVFrame *fin = NULL;
468 int ret = 0;
469
470 fin = ff_get_audio_buffer(inlink, s->win_size);
471 if (!fin) {
472 ret = AVERROR(ENOMEM);
473 goto fail;
474 }
475
476 fin->pts = s->pts;
477 s->pts += s->hop_size;
478 ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size);
479 if (ret < 0)
480 goto fail;
481
482 ret = plot_freqs(inlink, fin);
483 av_frame_free(&fin);
484 av_audio_fifo_drain(s->fifo, s->hop_size);
485
486 fail:
487 av_frame_free(&fin);
488 return ret;
489 }
490
activate(AVFilterContext * ctx)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 = NULL;
497 int ret = 0;
498
499 FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
500
501 if (av_audio_fifo_size(s->fifo) < s->win_size)
502 ret = ff_inlink_consume_samples(inlink, s->win_size, s->win_size, &in);
503 if (ret < 0)
504 return ret;
505 if (ret > 0) {
506 av_audio_fifo_write(s->fifo, (void **)in->extended_data, in->nb_samples);
507 if (s->pts == AV_NOPTS_VALUE)
508 s->pts = in->pts;
509 av_frame_free(&in);
510 }
511
512 if (av_audio_fifo_size(s->fifo) >= s->win_size) {
513 ret = filter_frame(inlink);
514 if (ret <= 0)
515 return ret;
516 }
517
518 FF_FILTER_FORWARD_STATUS(inlink, outlink);
519 FF_FILTER_FORWARD_WANTED(outlink, inlink);
520
521 return FFERROR_NOT_READY;
522 }
523
uninit(AVFilterContext * ctx)524 static av_cold void uninit(AVFilterContext *ctx)
525 {
526 ShowFreqsContext *s = ctx->priv;
527 int i;
528
529 av_fft_end(s->fft);
530 for (i = 0; i < s->nb_channels; 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->fft_data);
537 av_freep(&s->avg_data);
538 av_freep(&s->window_func_lut);
539 av_audio_fifo_free(s->fifo);
540 }
541
542 static const AVFilterPad showfreqs_inputs[] = {
543 {
544 .name = "default",
545 .type = AVMEDIA_TYPE_AUDIO,
546 },
547 { NULL }
548 };
549
550 static const AVFilterPad showfreqs_outputs[] = {
551 {
552 .name = "default",
553 .type = AVMEDIA_TYPE_VIDEO,
554 .config_props = config_output,
555 },
556 { NULL }
557 };
558
559 AVFilter ff_avf_showfreqs = {
560 .name = "showfreqs",
561 .description = NULL_IF_CONFIG_SMALL("Convert input audio to a frequencies video output."),
562 .init = init,
563 .uninit = uninit,
564 .query_formats = query_formats,
565 .priv_size = sizeof(ShowFreqsContext),
566 .activate = activate,
567 .inputs = showfreqs_inputs,
568 .outputs = showfreqs_outputs,
569 .priv_class = &showfreqs_class,
570 };
571