FFmpeg
af_silenceremove.c
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1 /*
2  * Copyright (c) 2001 Heikki Leinonen
3  * Copyright (c) 2001 Chris Bagwell
4  * Copyright (c) 2003 Donnie Smith
5  * Copyright (c) 2014 Paul B Mahol
6  *
7  * This file is part of FFmpeg.
8  *
9  * FFmpeg is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * FFmpeg is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with FFmpeg; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 #include <float.h> /* DBL_MAX */
25 
26 #include "libavutil/opt.h"
27 #include "libavutil/timestamp.h"
28 #include "audio.h"
29 #include "formats.h"
30 #include "avfilter.h"
31 #include "internal.h"
32 
36 };
37 
41 };
42 
49 };
50 
51 typedef struct SilenceRemoveContext {
52  const AVClass *class;
53 
55 
57  int64_t start_duration;
60  int64_t start_silence;
63 
65  int64_t stop_duration;
68  int64_t stop_silence;
70  int stop_mode;
71 
72  double *start_holdoff;
79 
80  double *stop_holdoff;
87 
88  double window_ratio;
89  double *window;
90  double *window_current;
91  double *window_end;
93  double sum;
94 
95  int restart;
96  int64_t next_pts;
97 
98  int detection;
99  void (*update)(struct SilenceRemoveContext *s, double sample);
100  double(*compute)(struct SilenceRemoveContext *s, double sample);
102 
103 #define OFFSET(x) offsetof(SilenceRemoveContext, x)
104 #define AF AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
105 
106 static const AVOption silenceremove_options[] = {
107  { "start_periods", NULL, OFFSET(start_periods), AV_OPT_TYPE_INT, {.i64=0}, 0, 9000, AF },
108  { "start_duration", "set start duration of non-silence part", OFFSET(start_duration_opt), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT32_MAX, AF },
109  { "start_threshold", "set threshold for start silence detection", OFFSET(start_threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, DBL_MAX, AF },
110  { "start_silence", "set start duration of silence part to keep", OFFSET(start_silence_opt), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT32_MAX, AF },
111  { "start_mode", "set which channel will trigger trimming from start", OFFSET(start_mode), AV_OPT_TYPE_INT, {.i64=T_ANY}, T_ANY, T_ALL, AF, "mode" },
112  { "any", 0, 0, AV_OPT_TYPE_CONST, {.i64=T_ANY}, 0, 0, AF, "mode" },
113  { "all", 0, 0, AV_OPT_TYPE_CONST, {.i64=T_ALL}, 0, 0, AF, "mode" },
114  { "stop_periods", NULL, OFFSET(stop_periods), AV_OPT_TYPE_INT, {.i64=0}, -9000, 9000, AF },
115  { "stop_duration", "set stop duration of non-silence part", OFFSET(stop_duration_opt), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT32_MAX, AF },
116  { "stop_threshold", "set threshold for stop silence detection", OFFSET(stop_threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, DBL_MAX, AF },
117  { "stop_silence", "set stop duration of silence part to keep", OFFSET(stop_silence_opt), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT32_MAX, AF },
118  { "stop_mode", "set which channel will trigger trimming from end", OFFSET(stop_mode), AV_OPT_TYPE_INT, {.i64=T_ANY}, T_ANY, T_ALL, AF, "mode" },
119  { "detection", "set how silence is detected", OFFSET(detection), AV_OPT_TYPE_INT, {.i64=D_RMS}, D_PEAK,D_RMS, AF, "detection" },
120  { "peak", "use absolute values of samples", 0, AV_OPT_TYPE_CONST, {.i64=D_PEAK},0, 0, AF, "detection" },
121  { "rms", "use squared values of samples", 0, AV_OPT_TYPE_CONST, {.i64=D_RMS}, 0, 0, AF, "detection" },
122  { "window", "set duration of window in seconds", OFFSET(window_ratio), AV_OPT_TYPE_DOUBLE, {.dbl=0.02}, 0, 10, AF },
123  { NULL }
124 };
125 
126 AVFILTER_DEFINE_CLASS(silenceremove);
127 
128 static double compute_peak(SilenceRemoveContext *s, double sample)
129 {
130  double new_sum;
131 
132  new_sum = s->sum;
133  new_sum -= *s->window_current;
134  new_sum += fabs(sample);
135 
136  return new_sum / s->window_size;
137 }
138 
140 {
141  s->sum -= *s->window_current;
142  *s->window_current = fabs(sample);
143  s->sum += *s->window_current;
144 
145  s->window_current++;
146  if (s->window_current >= s->window_end)
147  s->window_current = s->window;
148 }
149 
150 static double compute_rms(SilenceRemoveContext *s, double sample)
151 {
152  double new_sum;
153 
154  new_sum = s->sum;
155  new_sum -= *s->window_current;
156  new_sum += sample * sample;
157 
158  return sqrt(new_sum / s->window_size);
159 }
160 
162 {
163  s->sum -= *s->window_current;
164  *s->window_current = sample * sample;
165  s->sum += *s->window_current;
166 
167  s->window_current++;
168  if (s->window_current >= s->window_end)
169  s->window_current = s->window;
170 }
171 
173 {
174  SilenceRemoveContext *s = ctx->priv;
175 
176  if (s->stop_periods < 0) {
177  s->stop_periods = -s->stop_periods;
178  s->restart = 1;
179  }
180 
181  switch (s->detection) {
182  case D_PEAK:
183  s->update = update_peak;
184  s->compute = compute_peak;
185  break;
186  case D_RMS:
187  s->update = update_rms;
188  s->compute = compute_rms;
189  break;
190  }
191 
192  return 0;
193 }
194 
196 {
197  memset(s->window, 0, s->window_size * sizeof(*s->window));
198 
199  s->window_current = s->window;
200  s->window_end = s->window + s->window_size;
201  s->sum = 0;
202 }
203 
205 {
206  AVFilterContext *ctx = inlink->dst;
207  SilenceRemoveContext *s = ctx->priv;
208 
209  s->next_pts = AV_NOPTS_VALUE;
210  s->window_size = FFMAX((inlink->sample_rate * s->window_ratio), 1) * inlink->channels;
211  s->window = av_malloc_array(s->window_size, sizeof(*s->window));
212  if (!s->window)
213  return AVERROR(ENOMEM);
214 
215  clear_window(s);
216 
217  s->start_duration = av_rescale(s->start_duration_opt, inlink->sample_rate,
218  AV_TIME_BASE);
219  s->start_silence = av_rescale(s->start_silence_opt, inlink->sample_rate,
220  AV_TIME_BASE);
221  s->stop_duration = av_rescale(s->stop_duration_opt, inlink->sample_rate,
222  AV_TIME_BASE);
223  s->stop_silence = av_rescale(s->stop_silence_opt, inlink->sample_rate,
224  AV_TIME_BASE);
225 
226  s->start_holdoff = av_malloc_array(FFMAX(s->start_duration, 1),
227  sizeof(*s->start_holdoff) *
228  inlink->channels);
229  if (!s->start_holdoff)
230  return AVERROR(ENOMEM);
231 
232  s->start_silence_hold = av_malloc_array(FFMAX(s->start_silence, 1),
233  sizeof(*s->start_silence_hold) *
234  inlink->channels);
235  if (!s->start_silence_hold)
236  return AVERROR(ENOMEM);
237 
238  s->start_holdoff_offset = 0;
239  s->start_holdoff_end = 0;
240  s->start_found_periods = 0;
241 
242  s->stop_holdoff = av_malloc_array(FFMAX(s->stop_duration, 1),
243  sizeof(*s->stop_holdoff) *
244  inlink->channels);
245  if (!s->stop_holdoff)
246  return AVERROR(ENOMEM);
247 
248  s->stop_silence_hold = av_malloc_array(FFMAX(s->stop_silence, 1),
249  sizeof(*s->stop_silence_hold) *
250  inlink->channels);
251  if (!s->stop_silence_hold)
252  return AVERROR(ENOMEM);
253 
254  s->stop_holdoff_offset = 0;
255  s->stop_holdoff_end = 0;
256  s->stop_found_periods = 0;
257 
258  if (s->start_periods)
259  s->mode = SILENCE_TRIM;
260  else
261  s->mode = SILENCE_COPY;
262 
263  return 0;
264 }
265 
267  AVFrame *out, AVFilterLink *outlink,
268  int *nb_samples_written, int *ret, int flush_silence)
269 {
270  AVFrame *silence;
271 
272  if (*nb_samples_written) {
273  out->nb_samples = *nb_samples_written / outlink->channels;
274 
275  out->pts = s->next_pts;
276  s->next_pts += av_rescale_q(out->nb_samples,
277  (AVRational){1, outlink->sample_rate},
278  outlink->time_base);
279 
280  *ret = ff_filter_frame(outlink, out);
281  if (*ret < 0)
282  return;
283  *nb_samples_written = 0;
284  } else {
285  av_frame_free(&out);
286  }
287 
288  if (s->stop_silence_end <= 0 || !flush_silence)
289  return;
290 
291  silence = ff_get_audio_buffer(outlink, s->stop_silence_end / outlink->channels);
292  if (!silence) {
293  *ret = AVERROR(ENOMEM);
294  return;
295  }
296 
297  if (s->stop_silence_offset < s->stop_silence_end) {
298  memcpy(silence->data[0],
299  &s->stop_silence_hold[s->stop_silence_offset],
300  (s->stop_silence_end - s->stop_silence_offset) * sizeof(double));
301  }
302 
303  if (s->stop_silence_offset > 0) {
304  memcpy(silence->data[0] + (s->stop_silence_end - s->stop_silence_offset) * sizeof(double),
305  &s->stop_silence_hold[0],
306  s->stop_silence_offset * sizeof(double));
307  }
308 
309  s->stop_silence_offset = 0;
310  s->stop_silence_end = 0;
311 
312  silence->pts = s->next_pts;
313  s->next_pts += av_rescale_q(silence->nb_samples,
314  (AVRational){1, outlink->sample_rate},
315  outlink->time_base);
316 
317  *ret = ff_filter_frame(outlink, silence);
318 }
319 
321 {
322  AVFilterContext *ctx = inlink->dst;
323  AVFilterLink *outlink = ctx->outputs[0];
324  SilenceRemoveContext *s = ctx->priv;
325  int i, j, threshold, ret = 0;
326  int nbs, nb_samples_read, nb_samples_written;
327  double *obuf, *ibuf = (double *)in->data[0];
328  AVFrame *out;
329 
330  nb_samples_read = nb_samples_written = 0;
331 
332  if (s->next_pts == AV_NOPTS_VALUE)
333  s->next_pts = in->pts;
334 
335  switch (s->mode) {
336  case SILENCE_TRIM:
337 silence_trim:
338  nbs = in->nb_samples - nb_samples_read / outlink->channels;
339  if (!nbs)
340  break;
341 
342  for (i = 0; i < nbs; i++) {
343  if (s->start_mode == T_ANY) {
344  threshold = 0;
345  for (j = 0; j < outlink->channels; j++) {
346  threshold |= s->compute(s, ibuf[j]) > s->start_threshold;
347  }
348  } else {
349  threshold = 1;
350  for (j = 0; j < outlink->channels; j++) {
351  threshold &= s->compute(s, ibuf[j]) > s->start_threshold;
352  }
353  }
354 
355  if (threshold) {
356  for (j = 0; j < outlink->channels; j++) {
357  s->update(s, *ibuf);
358  s->start_holdoff[s->start_holdoff_end++] = *ibuf++;
359  }
360  nb_samples_read += outlink->channels;
361 
362  if (s->start_holdoff_end >= s->start_duration * outlink->channels) {
363  if (++s->start_found_periods >= s->start_periods) {
364  s->mode = SILENCE_TRIM_FLUSH;
365  goto silence_trim_flush;
366  }
367 
368  s->start_holdoff_offset = 0;
369  s->start_holdoff_end = 0;
370  s->start_silence_offset = 0;
371  s->start_silence_end = 0;
372  }
373  } else {
374  s->start_holdoff_end = 0;
375 
376  for (j = 0; j < outlink->channels; j++) {
377  s->update(s, ibuf[j]);
378  if (s->start_silence) {
379  s->start_silence_hold[s->start_silence_offset++] = ibuf[j];
380  s->start_silence_end = FFMIN(s->start_silence_end + 1, outlink->channels * s->start_silence);
381  if (s->start_silence_offset >= outlink->channels * s->start_silence) {
382  s->start_silence_offset = 0;
383  }
384  }
385  }
386 
387  ibuf += outlink->channels;
388  nb_samples_read += outlink->channels;
389  }
390  }
391  break;
392 
393  case SILENCE_TRIM_FLUSH:
394 silence_trim_flush:
395  nbs = s->start_holdoff_end - s->start_holdoff_offset;
396  nbs -= nbs % outlink->channels;
397  if (!nbs)
398  break;
399 
400  out = ff_get_audio_buffer(outlink, nbs / outlink->channels + s->start_silence_end / outlink->channels);
401  if (!out) {
402  av_frame_free(&in);
403  return AVERROR(ENOMEM);
404  }
405 
406  if (s->start_silence_end > 0) {
407  if (s->start_silence_offset < s->start_silence_end) {
408  memcpy(out->data[0],
409  &s->start_silence_hold[s->start_silence_offset],
410  (s->start_silence_end - s->start_silence_offset) * sizeof(double));
411  }
412 
413  if (s->start_silence_offset > 0) {
414  memcpy(out->data[0] + (s->start_silence_end - s->start_silence_offset) * sizeof(double),
415  &s->start_silence_hold[0],
416  s->start_silence_offset * sizeof(double));
417  }
418  }
419 
420  memcpy(out->data[0] + s->start_silence_end * sizeof(double),
421  &s->start_holdoff[s->start_holdoff_offset],
422  nbs * sizeof(double));
423 
424  out->pts = s->next_pts;
425  s->next_pts += av_rescale_q(out->nb_samples,
426  (AVRational){1, outlink->sample_rate},
427  outlink->time_base);
428 
429  s->start_holdoff_offset += nbs;
430 
431  ret = ff_filter_frame(outlink, out);
432 
433  if (s->start_holdoff_offset == s->start_holdoff_end) {
434  s->start_holdoff_offset = 0;
435  s->start_holdoff_end = 0;
436  s->start_silence_offset = 0;
437  s->start_silence_end = 0;
438  s->mode = SILENCE_COPY;
439  goto silence_copy;
440  }
441  break;
442 
443  case SILENCE_COPY:
444 silence_copy:
445  nbs = in->nb_samples - nb_samples_read / outlink->channels;
446  if (!nbs)
447  break;
448 
449  out = ff_get_audio_buffer(outlink, nbs);
450  if (!out) {
451  av_frame_free(&in);
452  return AVERROR(ENOMEM);
453  }
454  obuf = (double *)out->data[0];
455 
456  if (s->stop_periods) {
457  for (i = 0; i < nbs; i++) {
458  if (s->stop_mode == T_ANY) {
459  threshold = 0;
460  for (j = 0; j < outlink->channels; j++) {
461  threshold |= s->compute(s, ibuf[j]) > s->stop_threshold;
462  }
463  } else {
464  threshold = 1;
465  for (j = 0; j < outlink->channels; j++) {
466  threshold &= s->compute(s, ibuf[j]) > s->stop_threshold;
467  }
468  }
469 
470  if (threshold && s->stop_holdoff_end && !s->stop_silence) {
471  s->mode = SILENCE_COPY_FLUSH;
472  flush(s, out, outlink, &nb_samples_written, &ret, 0);
473  goto silence_copy_flush;
474  } else if (threshold) {
475  for (j = 0; j < outlink->channels; j++) {
476  s->update(s, *ibuf);
477  *obuf++ = *ibuf++;
478  }
479  nb_samples_read += outlink->channels;
480  nb_samples_written += outlink->channels;
481  } else if (!threshold) {
482  for (j = 0; j < outlink->channels; j++) {
483  s->update(s, *ibuf);
484  if (s->stop_silence) {
485  s->stop_silence_hold[s->stop_silence_offset++] = *ibuf;
486  s->stop_silence_end = FFMIN(s->stop_silence_end + 1, outlink->channels * s->stop_silence);
487  if (s->stop_silence_offset >= outlink->channels * s->stop_silence) {
488  s->stop_silence_offset = 0;
489  }
490  }
491 
492  s->stop_holdoff[s->stop_holdoff_end++] = *ibuf++;
493  }
494  nb_samples_read += outlink->channels;
495 
496  if (s->stop_holdoff_end >= s->stop_duration * outlink->channels) {
497  if (++s->stop_found_periods >= s->stop_periods) {
498  s->stop_holdoff_offset = 0;
499  s->stop_holdoff_end = 0;
500 
501  if (!s->restart) {
502  s->mode = SILENCE_STOP;
503  flush(s, out, outlink, &nb_samples_written, &ret, 1);
504  goto silence_stop;
505  } else {
506  s->stop_found_periods = 0;
507  s->start_found_periods = 0;
508  s->start_holdoff_offset = 0;
509  s->start_holdoff_end = 0;
510  s->start_silence_offset = 0;
511  s->start_silence_end = 0;
512  clear_window(s);
513  s->mode = SILENCE_TRIM;
514  flush(s, out, outlink, &nb_samples_written, &ret, 1);
515  goto silence_trim;
516  }
517  }
518  s->mode = SILENCE_COPY_FLUSH;
519  flush(s, out, outlink, &nb_samples_written, &ret, 0);
520  goto silence_copy_flush;
521  }
522  }
523  }
524  flush(s, out, outlink, &nb_samples_written, &ret, 0);
525  } else {
526  memcpy(obuf, ibuf, sizeof(double) * nbs * outlink->channels);
527 
528  out->pts = s->next_pts;
529  s->next_pts += av_rescale_q(out->nb_samples,
530  (AVRational){1, outlink->sample_rate},
531  outlink->time_base);
532 
533  ret = ff_filter_frame(outlink, out);
534  }
535  break;
536 
537  case SILENCE_COPY_FLUSH:
538 silence_copy_flush:
539  nbs = s->stop_holdoff_end - s->stop_holdoff_offset;
540  nbs -= nbs % outlink->channels;
541  if (!nbs)
542  break;
543 
544  out = ff_get_audio_buffer(outlink, nbs / outlink->channels);
545  if (!out) {
546  av_frame_free(&in);
547  return AVERROR(ENOMEM);
548  }
549 
550  memcpy(out->data[0], &s->stop_holdoff[s->stop_holdoff_offset],
551  nbs * sizeof(double));
552  s->stop_holdoff_offset += nbs;
553 
554  out->pts = s->next_pts;
555  s->next_pts += av_rescale_q(out->nb_samples,
556  (AVRational){1, outlink->sample_rate},
557  outlink->time_base);
558 
559  ret = ff_filter_frame(outlink, out);
560 
561  if (s->stop_holdoff_offset == s->stop_holdoff_end) {
562  s->stop_holdoff_offset = 0;
563  s->stop_holdoff_end = 0;
564  s->stop_silence_offset = 0;
565  s->stop_silence_end = 0;
566  s->mode = SILENCE_COPY;
567  goto silence_copy;
568  }
569  break;
570  case SILENCE_STOP:
571 silence_stop:
572  break;
573  }
574 
575  av_frame_free(&in);
576 
577  return ret;
578 }
579 
580 static int request_frame(AVFilterLink *outlink)
581 {
582  AVFilterContext *ctx = outlink->src;
583  SilenceRemoveContext *s = ctx->priv;
584  int ret;
585 
586  ret = ff_request_frame(ctx->inputs[0]);
587  if (ret == AVERROR_EOF && (s->mode == SILENCE_COPY_FLUSH ||
588  s->mode == SILENCE_COPY)) {
589  int nbs = s->stop_holdoff_end - s->stop_holdoff_offset;
590  if (nbs) {
591  AVFrame *frame;
592 
593  frame = ff_get_audio_buffer(outlink, nbs / outlink->channels);
594  if (!frame)
595  return AVERROR(ENOMEM);
596 
597  memcpy(frame->data[0], &s->stop_holdoff[s->stop_holdoff_offset],
598  nbs * sizeof(double));
599 
600  frame->pts = s->next_pts;
601  s->next_pts += av_rescale_q(frame->nb_samples,
602  (AVRational){1, outlink->sample_rate},
603  outlink->time_base);
604 
605  ret = ff_filter_frame(outlink, frame);
606  }
607  s->mode = SILENCE_STOP;
608  }
609  return ret;
610 }
611 
613 {
616  static const enum AVSampleFormat sample_fmts[] = {
618  };
619  int ret;
620 
622  if (!layouts)
623  return AVERROR(ENOMEM);
625  if (ret < 0)
626  return ret;
627 
629  if (!formats)
630  return AVERROR(ENOMEM);
632  if (ret < 0)
633  return ret;
634 
636  if (!formats)
637  return AVERROR(ENOMEM);
639 }
640 
642 {
643  SilenceRemoveContext *s = ctx->priv;
644 
645  av_freep(&s->start_holdoff);
646  av_freep(&s->start_silence_hold);
647  av_freep(&s->stop_holdoff);
648  av_freep(&s->stop_silence_hold);
649  av_freep(&s->window);
650 }
651 
653  {
654  .name = "default",
655  .type = AVMEDIA_TYPE_AUDIO,
656  .config_props = config_input,
657  .filter_frame = filter_frame,
658  },
659  { NULL }
660 };
661 
663  {
664  .name = "default",
665  .type = AVMEDIA_TYPE_AUDIO,
666  .request_frame = request_frame,
667  },
668  { NULL }
669 };
670 
672  .name = "silenceremove",
673  .description = NULL_IF_CONFIG_SMALL("Remove silence."),
674  .priv_size = sizeof(SilenceRemoveContext),
675  .priv_class = &silenceremove_class,
676  .init = init,
677  .uninit = uninit,
681 };
formats
formats
Definition: signature.h:48
ff_get_audio_buffer
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
Definition: audio.c:86
AVFilterChannelLayouts
A list of supported channel layouts.
Definition: formats.h:86
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
ff_make_format_list
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:286
compute_rms
static double compute_rms(SilenceRemoveContext *s, double sample)
Definition: af_silenceremove.c:150
out
FILE * out
Definition: movenc.c:54
SilenceRemoveContext::stop_silence_offset
size_t stop_silence_offset
Definition: af_silenceremove.c:84
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:978
sample_fmts
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:953
layouts
enum MovChannelLayoutTag * layouts
Definition: mov_chan.c:434
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
init
static av_cold int init(AVFilterContext *ctx)
Definition: af_silenceremove.c:172
inlink
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
Definition: filter_design.txt:212
SilenceRemoveContext::window_size
int window_size
Definition: af_silenceremove.c:92
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:111
ff_all_channel_counts
AVFilterChannelLayouts * ff_all_channel_counts(void)
Construct an AVFilterChannelLayouts coding for any channel layout, with known or unknown disposition.
Definition: formats.c:429
SilenceRemoveContext::start_holdoff_offset
size_t start_holdoff_offset
Definition: af_silenceremove.c:74
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
request_frame
static int request_frame(AVFilterLink *outlink)
Definition: af_silenceremove.c:580
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:396
SilenceDetect
SilenceDetect
Definition: af_silenceremove.c:33
AVOption
AVOption.
Definition: opt.h:248
AV_OPT_TYPE_DURATION
@ AV_OPT_TYPE_DURATION
Definition: opt.h:239
ff_request_frame
int ff_request_frame(AVFilterLink *link)
Request an input frame from the filter at the other end of the link.
Definition: avfilter.c:395
silenceremove_inputs
static const AVFilterPad silenceremove_inputs[]
Definition: af_silenceremove.c:652
SilenceRemoveContext::start_duration_opt
int64_t start_duration_opt
Definition: af_silenceremove.c:58
float.h
SilenceRemoveContext::start_holdoff
double * start_holdoff
Definition: af_silenceremove.c:72
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:149
compute_peak
static double compute_peak(SilenceRemoveContext *s, double sample)
Definition: af_silenceremove.c:128
SilenceRemoveContext::start_silence_opt
int64_t start_silence_opt
Definition: af_silenceremove.c:61
SilenceRemoveContext::stop_silence
int64_t stop_silence
Definition: af_silenceremove.c:68
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(silenceremove)
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
update_peak
static void update_peak(SilenceRemoveContext *s, double sample)
Definition: af_silenceremove.c:139
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:65
formats.h
SilenceRemoveContext::stop_holdoff
double * stop_holdoff
Definition: af_silenceremove.c:80
SilenceRemoveContext::detection
int detection
Definition: af_silenceremove.c:98
SilenceRemoveContext::compute
double(* compute)(struct SilenceRemoveContext *s, double sample)
Definition: af_silenceremove.c:100
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:54
SilenceRemoveContext::window
double * window
Definition: af_silenceremove.c:89
av_cold
#define av_cold
Definition: attributes.h:90
inputs
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several inputs
Definition: filter_design.txt:243
ff_set_common_formats
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:580
s
#define s(width, name)
Definition: cbs_vp9.c:257
SilenceRemoveContext::mode
enum SilenceMode mode
Definition: af_silenceremove.c:54
SILENCE_STOP
@ SILENCE_STOP
Definition: af_silenceremove.c:48
AV_OPT_TYPE_DOUBLE
@ AV_OPT_TYPE_DOUBLE
Definition: opt.h:227
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: af_silenceremove.c:320
outputs
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
ctx
AVFormatContext * ctx
Definition: movenc.c:48
av_rescale_q
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
SilenceRemoveContext::start_silence_end
size_t start_silence_end
Definition: af_silenceremove.c:77
if
if(ret)
Definition: filter_design.txt:179
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: af_silenceremove.c:612
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
fabs
static __device__ float fabs(float a)
Definition: cuda_runtime.h:182
NULL
#define NULL
Definition: coverity.c:32
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
SilenceRemoveContext::start_silence_offset
size_t start_silence_offset
Definition: af_silenceremove.c:76
SilenceRemoveContext
Definition: af_silenceremove.c:51
SILENCE_TRIM
@ SILENCE_TRIM
Definition: af_silenceremove.c:44
SilenceRemoveContext::start_threshold
double start_threshold
Definition: af_silenceremove.c:59
silenceremove_options
static const AVOption silenceremove_options[]
Definition: af_silenceremove.c:106
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_silenceremove.c:641
SILENCE_COPY_FLUSH
@ SILENCE_COPY_FLUSH
Definition: af_silenceremove.c:47
AF
#define AF
Definition: af_silenceremove.c:104
SilenceRemoveContext::start_found_periods
int start_found_periods
Definition: af_silenceremove.c:78
update_rms
static void update_rms(SilenceRemoveContext *s, double sample)
Definition: af_silenceremove.c:161
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
config_input
static int config_input(AVFilterLink *inlink)
Definition: af_silenceremove.c:204
FFMAX
#define FFMAX(a, b)
Definition: common.h:103
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
sample
#define sample
Definition: flacdsp_template.c:44
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
SilenceRemoveContext::stop_holdoff_offset
size_t stop_holdoff_offset
Definition: af_silenceremove.c:82
SilenceRemoveContext::stop_periods
int stop_periods
Definition: af_silenceremove.c:64
FFMIN
#define FFMIN(a, b)
Definition: common.h:105
SILENCE_COPY
@ SILENCE_COPY
Definition: af_silenceremove.c:46
clear_window
static void clear_window(SilenceRemoveContext *s)
Definition: af_silenceremove.c:195
SilenceRemoveContext::sum
double sum
Definition: af_silenceremove.c:93
flush
static void flush(SilenceRemoveContext *s, AVFrame *out, AVFilterLink *outlink, int *nb_samples_written, int *ret, int flush_silence)
Definition: af_silenceremove.c:266
SILENCE_TRIM_FLUSH
@ SILENCE_TRIM_FLUSH
Definition: af_silenceremove.c:45
SilenceRemoveContext::start_holdoff_end
size_t start_holdoff_end
Definition: af_silenceremove.c:75
internal.h
SilenceRemoveContext::start_silence_hold
double * start_silence_hold
Definition: af_silenceremove.c:73
AVFrame::nb_samples
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:369
SilenceRemoveContext::stop_silence_opt
int64_t stop_silence_opt
Definition: af_silenceremove.c:69
i
int i
Definition: input.c:407
ff_af_silenceremove
const AVFilter ff_af_silenceremove
Definition: af_silenceremove.c:671
SilenceRemoveContext::window_current
double * window_current
Definition: af_silenceremove.c:90
SilenceRemoveContext::stop_mode
int stop_mode
Definition: af_silenceremove.c:70
AV_TIME_BASE
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:254
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:32
SilenceMode
SilenceMode
Definition: af_silenceremove.c:43
SilenceRemoveContext::stop_duration
int64_t stop_duration
Definition: af_silenceremove.c:65
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
SilenceRemoveContext::stop_silence_end
size_t stop_silence_end
Definition: af_silenceremove.c:85
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:60
av_rescale
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:129
SilenceRemoveContext::stop_found_periods
int stop_found_periods
Definition: af_silenceremove.c:86
SilenceRemoveContext::start_mode
int start_mode
Definition: af_silenceremove.c:62
AVFilter
Filter definition.
Definition: avfilter.h:145
SilenceRemoveContext::stop_threshold
double stop_threshold
Definition: af_silenceremove.c:67
ret
ret
Definition: filter_design.txt:187
SilenceRemoveContext::stop_silence_hold
double * stop_silence_hold
Definition: af_silenceremove.c:81
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
SilenceRemoveContext::restart
int restart
Definition: af_silenceremove.c:95
D_PEAK
@ D_PEAK
Definition: af_silenceremove.c:34
OFFSET
#define OFFSET(x)
Definition: af_silenceremove.c:103
SilenceRemoveContext::start_periods
int start_periods
Definition: af_silenceremove.c:56
ff_all_samplerates
AVFilterFormats * ff_all_samplerates(void)
Definition: formats.c:414
SilenceRemoveContext::window_end
double * window_end
Definition: af_silenceremove.c:91
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
avfilter.h
SilenceRemoveContext::update
void(* update)(struct SilenceRemoveContext *s, double sample)
Definition: af_silenceremove.c:99
AVFilterContext
An instance of a filter.
Definition: avfilter.h:333
ThresholdMode
ThresholdMode
Definition: af_silenceremove.c:38
audio.h
SilenceRemoveContext::stop_duration_opt
int64_t stop_duration_opt
Definition: af_silenceremove.c:66
SilenceRemoveContext::start_silence
int64_t start_silence
Definition: af_silenceremove.c:60
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
silenceremove_outputs
static const AVFilterPad silenceremove_outputs[]
Definition: af_silenceremove.c:662
timestamp.h
ff_set_common_samplerates
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:568
T_ALL
@ T_ALL
Definition: af_silenceremove.c:40
AV_SAMPLE_FMT_DBL
@ AV_SAMPLE_FMT_DBL
double
Definition: samplefmt.h:64
D_RMS
@ D_RMS
Definition: af_silenceremove.c:35
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:234
SilenceRemoveContext::stop_holdoff_end
size_t stop_holdoff_end
Definition: af_silenceremove.c:83
SilenceRemoveContext::start_duration
int64_t start_duration
Definition: af_silenceremove.c:57
T_ANY
@ T_ANY
Definition: af_silenceremove.c:39
SilenceRemoveContext::window_ratio
double window_ratio
Definition: af_silenceremove.c:88
ff_set_common_channel_layouts
int ff_set_common_channel_layouts(AVFilterContext *ctx, AVFilterChannelLayouts *channel_layouts)
A helper for query_formats() which sets all links to the same list of channel layouts/sample rates.
Definition: formats.c:561
SilenceRemoveContext::next_pts
int64_t next_pts
Definition: af_silenceremove.c:96