FFmpeg
af_adrc.c
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1 /*
2  * Copyright (c) 2022 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 
23 #include "libavutil/eval.h"
24 #include "libavutil/ffmath.h"
25 #include "libavutil/mem.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/tx.h"
28 #include "audio.h"
29 #include "avfilter.h"
30 #include "filters.h"
31 #include "internal.h"
32 
33 static const char * const var_names[] = {
34  "ch", ///< the value of the current channel
35  "sn", ///< number of samples
36  "nb_channels",
37  "t", ///< timestamp expressed in seconds
38  "sr", ///< sample rate
39  "p", ///< input power in dB for frequency bin
40  "f", ///< frequency in Hz
41  NULL
42 };
43 
44 enum var_name {
53 };
54 
55 typedef struct AudioDRCContext {
56  const AVClass *class;
57 
58  double attack_ms;
59  double release_ms;
60  char *expr_str;
61 
62  double attack;
63  double release;
64 
65  int fft_size;
66  int overlap;
67  int channels;
68 
69  float fx;
70  float *window;
71 
83 
86 
91 
95 
96 #define OFFSET(x) offsetof(AudioDRCContext, x)
97 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_RUNTIME_PARAM
98 
99 static const AVOption adrc_options[] = {
100  { "transfer", "set the transfer expression", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str="p"}, 0, 0, FLAGS },
101  { "attack", "set the attack", OFFSET(attack_ms), AV_OPT_TYPE_DOUBLE, {.dbl=50.}, 1, 1000, FLAGS },
102  { "release", "set the release", OFFSET(release_ms), AV_OPT_TYPE_DOUBLE, {.dbl=100.}, 5, 2000, FLAGS },
103  { "channels", "set channels to filter",OFFSET(channels_to_filter),AV_OPT_TYPE_STRING,{.str="all"},0, 0, FLAGS },
104  {NULL}
105 };
106 
108 
109 static void generate_hann_window(float *window, int size)
110 {
111  for (int i = 0; i < size; i++) {
112  float value = 0.5f * (1.f - cosf(2.f * M_PI * i / size));
113 
114  window[i] = value;
115  }
116 }
117 
119 {
120  AVFilterContext *ctx = inlink->dst;
121  AudioDRCContext *s = ctx->priv;
122  float scale;
123  int ret;
124 
125  s->fft_size = inlink->sample_rate > 100000 ? 1024 : inlink->sample_rate > 50000 ? 512 : 256;
126  s->fx = inlink->sample_rate * 0.5f / (s->fft_size / 2 + 1);
127  s->overlap = s->fft_size / 4;
128 
129  s->window = av_calloc(s->fft_size, sizeof(*s->window));
130  if (!s->window)
131  return AVERROR(ENOMEM);
132 
133  s->drc_frame = ff_get_audio_buffer(inlink, s->fft_size * 2);
134  s->energy = ff_get_audio_buffer(inlink, s->fft_size / 2 + 1);
135  s->envelope = ff_get_audio_buffer(inlink, s->fft_size / 2 + 1);
136  s->factors = ff_get_audio_buffer(inlink, s->fft_size / 2 + 1);
137  s->in_buffer = ff_get_audio_buffer(inlink, s->fft_size * 2);
138  s->in_frame = ff_get_audio_buffer(inlink, s->fft_size * 2);
139  s->out_dist_frame = ff_get_audio_buffer(inlink, s->fft_size * 2);
140  s->spectrum_buf = ff_get_audio_buffer(inlink, s->fft_size * 2);
141  s->target_gain = ff_get_audio_buffer(inlink, s->fft_size / 2 + 1);
142  s->windowed_frame = ff_get_audio_buffer(inlink, s->fft_size * 2);
143  if (!s->in_buffer || !s->in_frame || !s->target_gain ||
144  !s->out_dist_frame || !s->windowed_frame || !s->envelope ||
145  !s->drc_frame || !s->spectrum_buf || !s->energy || !s->factors)
146  return AVERROR(ENOMEM);
147 
148  generate_hann_window(s->window, s->fft_size);
149 
150  s->channels = inlink->ch_layout.nb_channels;
151 
152  s->tx_ctx = av_calloc(s->channels, sizeof(*s->tx_ctx));
153  s->itx_ctx = av_calloc(s->channels, sizeof(*s->itx_ctx));
154  if (!s->tx_ctx || !s->itx_ctx)
155  return AVERROR(ENOMEM);
156 
157  for (int ch = 0; ch < s->channels; ch++) {
158  scale = 1.f / s->fft_size;
159  ret = av_tx_init(&s->tx_ctx[ch], &s->tx_fn, AV_TX_FLOAT_RDFT, 0, s->fft_size, &scale, 0);
160  if (ret < 0)
161  return ret;
162 
163  scale = 1.f;
164  ret = av_tx_init(&s->itx_ctx[ch], &s->itx_fn, AV_TX_FLOAT_RDFT, 1, s->fft_size, &scale, 0);
165  if (ret < 0)
166  return ret;
167  }
168 
169  s->var_values[VAR_SR] = inlink->sample_rate;
170  s->var_values[VAR_NB_CHANNELS] = s->channels;
171 
172  return av_expr_parse(&s->expr, s->expr_str, var_names, NULL, NULL,
173  NULL, NULL, 0, ctx);
174 }
175 
177  const float *in_frame, float *out_frame, const int add_to_out_frame)
178 {
179  const float *window = s->window;
180  const int fft_size = s->fft_size;
181 
182  if (add_to_out_frame) {
183  for (int i = 0; i < fft_size; i++)
184  out_frame[i] += in_frame[i] * window[i];
185  } else {
186  for (int i = 0; i < fft_size; i++)
187  out_frame[i] = in_frame[i] * window[i];
188  }
189 }
190 
191 static float sqrf(float x)
192 {
193  return x * x;
194 }
195 
197  int len,
198  float *energy,
199  const float *spectral)
200 {
201  for (int n = 0; n < len; n++) {
202  energy[n] = 10.f * log10f(sqrf(spectral[2 * n]) + sqrf(spectral[2 * n + 1]));
203  if (!isnormal(energy[n]))
204  energy[n] = -351.f;
205  }
206 }
207 
209  int len,
210  float *gain,
211  const float *energy,
212  double *var_values,
213  float fx, int bypass)
214 {
215  AudioDRCContext *s = ctx->priv;
216 
217  if (bypass) {
218  memcpy(gain, energy, sizeof(*gain) * len);
219  return;
220  }
221 
222  for (int n = 0; n < len; n++) {
223  const float Xg = energy[n];
224 
225  var_values[VAR_P] = Xg;
226  var_values[VAR_F] = n * fx;
227 
228  gain[n] = av_expr_eval(s->expr, var_values, s);
229  }
230 }
231 
233  int len,
234  float *envelope,
235  const float *energy,
236  const float *gain)
237 {
238  AudioDRCContext *s = ctx->priv;
239  const float release = s->release;
240  const float attack = s->attack;
241 
242  for (int n = 0; n < len; n++) {
243  const float Bg = gain[n] - energy[n];
244  const float Vg = envelope[n];
245 
246  if (Bg > Vg) {
247  envelope[n] = attack * Vg + (1.f - attack) * Bg;
248  } else if (Bg <= Vg) {
249  envelope[n] = release * Vg + (1.f - release) * Bg;
250  } else {
251  envelope[n] = 0.f;
252  }
253  }
254 }
255 
257  int len,
258  float *factors,
259  const float *envelope)
260 {
261  for (int n = 0; n < len; n++)
262  factors[n] = sqrtf(ff_exp10f(envelope[n] / 10.f));
263 }
264 
266  int len,
267  float *spectrum,
268  const float *factors)
269 {
270  for (int n = 0; n < len; n++) {
271  spectrum[2*n+0] *= factors[n];
272  spectrum[2*n+1] *= factors[n];
273  }
274 }
275 
276 static void feed(AVFilterContext *ctx, int ch,
277  const float *in_samples, float *out_samples,
278  float *in_frame, float *out_dist_frame,
279  float *windowed_frame, float *drc_frame,
280  float *spectrum_buf, float *energy,
281  float *target_gain, float *envelope,
282  float *factors)
283 {
284  AudioDRCContext *s = ctx->priv;
285  double var_values[VAR_VARS_NB];
286  const int fft_size = s->fft_size;
287  const int nb_coeffs = s->fft_size / 2 + 1;
288  const int overlap = s->overlap;
289  enum AVChannel channel = av_channel_layout_channel_from_index(&ctx->inputs[0]->ch_layout, ch);
290  const int bypass = av_channel_layout_index_from_channel(&s->ch_layout, channel) < 0;
291 
292  memcpy(var_values, s->var_values, sizeof(var_values));
293 
294  var_values[VAR_CH] = ch;
295 
296  // shift in/out buffers
297  memmove(in_frame, in_frame + overlap, (fft_size - overlap) * sizeof(*in_frame));
298  memmove(out_dist_frame, out_dist_frame + overlap, (fft_size - overlap) * sizeof(*out_dist_frame));
299 
300  memcpy(in_frame + fft_size - overlap, in_samples, sizeof(*in_frame) * overlap);
301  memset(out_dist_frame + fft_size - overlap, 0, sizeof(*out_dist_frame) * overlap);
302 
303  apply_window(s, in_frame, windowed_frame, 0);
304  s->tx_fn(s->tx_ctx[ch], spectrum_buf, windowed_frame, sizeof(float));
305 
306  get_energy(ctx, nb_coeffs, energy, spectrum_buf);
307  get_target_gain(ctx, nb_coeffs, target_gain, energy, var_values, s->fx, bypass);
308  get_envelope(ctx, nb_coeffs, envelope, energy, target_gain);
309  get_factors(ctx, nb_coeffs, factors, envelope);
310  apply_factors(ctx, nb_coeffs, spectrum_buf, factors);
311 
312  s->itx_fn(s->itx_ctx[ch], drc_frame, spectrum_buf, sizeof(AVComplexFloat));
313 
314  apply_window(s, drc_frame, out_dist_frame, 1);
315 
316  // 4 times overlap with squared hanning window results in 1.5 time increase in amplitude
317  if (!ctx->is_disabled) {
318  for (int i = 0; i < overlap; i++)
319  out_samples[i] = out_dist_frame[i] / 1.5f;
320  } else {
321  memcpy(out_samples, in_frame, sizeof(*out_samples) * overlap);
322  }
323 }
324 
325 static int drc_channel(AVFilterContext *ctx, AVFrame *in, AVFrame *out, int ch)
326 {
327  AudioDRCContext *s = ctx->priv;
328  const float *src = (const float *)in->extended_data[ch];
329  float *in_buffer = (float *)s->in_buffer->extended_data[ch];
330  float *dst = (float *)out->extended_data[ch];
331 
332  memcpy(in_buffer, src, sizeof(*in_buffer) * s->overlap);
333 
334  feed(ctx, ch, in_buffer, dst,
335  (float *)(s->in_frame->extended_data[ch]),
336  (float *)(s->out_dist_frame->extended_data[ch]),
337  (float *)(s->windowed_frame->extended_data[ch]),
338  (float *)(s->drc_frame->extended_data[ch]),
339  (float *)(s->spectrum_buf->extended_data[ch]),
340  (float *)(s->energy->extended_data[ch]),
341  (float *)(s->target_gain->extended_data[ch]),
342  (float *)(s->envelope->extended_data[ch]),
343  (float *)(s->factors->extended_data[ch]));
344 
345  return 0;
346 }
347 
348 static int drc_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
349 {
350  AudioDRCContext *s = ctx->priv;
351  AVFrame *in = s->in;
352  AVFrame *out = arg;
353  const int start = (out->ch_layout.nb_channels * jobnr) / nb_jobs;
354  const int end = (out->ch_layout.nb_channels * (jobnr+1)) / nb_jobs;
355 
356  for (int ch = start; ch < end; ch++)
357  drc_channel(ctx, in, out, ch);
358 
359  return 0;
360 }
361 
363 {
364  AVFilterContext *ctx = inlink->dst;
365  AVFilterLink *outlink = ctx->outputs[0];
366  AudioDRCContext *s = ctx->priv;
367  AVFrame *out;
368  int ret;
369 
370  out = ff_get_audio_buffer(outlink, s->overlap);
371  if (!out) {
372  ret = AVERROR(ENOMEM);
373  goto fail;
374  }
375 
376  s->var_values[VAR_SN] = outlink->sample_count_in;
377  s->var_values[VAR_T] = s->var_values[VAR_SN] * (double)1/outlink->sample_rate;
378 
379  s->in = in;
383 
384  out->pts = in->pts;
385  out->nb_samples = in->nb_samples;
386  ret = ff_filter_frame(outlink, out);
387 fail:
388  av_frame_free(&in);
389  s->in = NULL;
390  return ret < 0 ? ret : 0;
391 }
392 
394 {
395  AVFilterLink *inlink = ctx->inputs[0];
396  AVFilterLink *outlink = ctx->outputs[0];
397  AudioDRCContext *s = ctx->priv;
398  AVFrame *in = NULL;
399  int ret = 0, status;
400  int64_t pts;
401 
402  ret = av_channel_layout_copy(&s->ch_layout, &inlink->ch_layout);
403  if (ret < 0)
404  return ret;
405  if (strcmp(s->channels_to_filter, "all"))
406  av_channel_layout_from_string(&s->ch_layout, s->channels_to_filter);
407 
409 
410  ret = ff_inlink_consume_samples(inlink, s->overlap, s->overlap, &in);
411  if (ret < 0)
412  return ret;
413 
414  if (ret > 0) {
415  s->attack = expf(-1.f / (s->attack_ms * inlink->sample_rate / 1000.f));
416  s->release = expf(-1.f / (s->release_ms * inlink->sample_rate / 1000.f));
417 
418  return filter_frame(inlink, in);
419  } else if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
420  ff_outlink_set_status(outlink, status, pts);
421  return 0;
422  } else {
423  if (ff_inlink_queued_samples(inlink) >= s->overlap) {
425  } else if (ff_outlink_frame_wanted(outlink)) {
427  }
428  return 0;
429  }
430 }
431 
433 {
434  AudioDRCContext *s = ctx->priv;
435 
436  av_channel_layout_uninit(&s->ch_layout);
437 
438  av_expr_free(s->expr);
439  s->expr = NULL;
440 
441  av_freep(&s->window);
442 
443  av_frame_free(&s->drc_frame);
444  av_frame_free(&s->energy);
445  av_frame_free(&s->envelope);
446  av_frame_free(&s->factors);
447  av_frame_free(&s->in_buffer);
448  av_frame_free(&s->in_frame);
449  av_frame_free(&s->out_dist_frame);
450  av_frame_free(&s->spectrum_buf);
451  av_frame_free(&s->target_gain);
452  av_frame_free(&s->windowed_frame);
453 
454  for (int ch = 0; ch < s->channels; ch++) {
455  if (s->tx_ctx)
456  av_tx_uninit(&s->tx_ctx[ch]);
457  if (s->itx_ctx)
458  av_tx_uninit(&s->itx_ctx[ch]);
459  }
460 
461  av_freep(&s->tx_ctx);
462  av_freep(&s->itx_ctx);
463 }
464 
465 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
466  char *res, int res_len, int flags)
467 {
468  AudioDRCContext *s = ctx->priv;
469  char *old_expr_str = av_strdup(s->expr_str);
470  int ret;
471 
472  ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
473  if (ret >= 0 && strcmp(old_expr_str, s->expr_str)) {
474  ret = av_expr_parse(&s->expr, s->expr_str, var_names, NULL, NULL,
475  NULL, NULL, 0, ctx);
476  }
477  av_free(old_expr_str);
478  return ret;
479 }
480 
481 static const AVFilterPad inputs[] = {
482  {
483  .name = "default",
484  .type = AVMEDIA_TYPE_AUDIO,
485  .config_props = config_input,
486  },
487 };
488 
490  .name = "adrc",
491  .description = NULL_IF_CONFIG_SMALL("Audio Spectral Dynamic Range Controller."),
492  .priv_size = sizeof(AudioDRCContext),
493  .priv_class = &adrc_class,
494  .uninit = uninit,
500  .activate = activate,
501  .process_command = process_command,
502 };
AudioDRCContext::expr
AVExpr * expr
Definition: af_adrc.c:92
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:97
AV_SAMPLE_FMT_FLTP
@ AV_SAMPLE_FMT_FLTP
float, planar
Definition: samplefmt.h:66
AudioDRCContext::fx
float fx
Definition: af_adrc.c:69
AudioDRCContext::ch_layout
AVChannelLayout ch_layout
Definition: af_adrc.c:85
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
var_name
var_name
Definition: noise.c:47
out
FILE * out
Definition: movenc.c:55
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1015
AudioDRCContext::itx_fn
av_tx_fn itx_fn
Definition: af_adrc.c:90
AVTXContext
Definition: tx_priv.h:235
FILTER_SINGLE_SAMPLEFMT
#define FILTER_SINGLE_SAMPLEFMT(sample_fmt_)
Definition: internal.h:175
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
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:160
feed
static void feed(AVFilterContext *ctx, int ch, const float *in_samples, float *out_samples, float *in_frame, float *out_dist_frame, float *windowed_frame, float *drc_frame, float *spectrum_buf, float *energy, float *target_gain, float *envelope, float *factors)
Definition: af_adrc.c:276
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:486
av_channel_layout_channel_from_index
enum AVChannel av_channel_layout_channel_from_index(const AVChannelLayout *channel_layout, unsigned int idx)
Get the channel with the given index in a channel layout.
Definition: channel_layout.c:665
AVOption
AVOption.
Definition: opt.h:357
expf
#define expf(x)
Definition: libm.h:283
generate_hann_window
static void generate_hann_window(float *window, int size)
Definition: af_adrc.c:109
adrc_options
static const AVOption adrc_options[]
Definition: af_adrc.c:99
float.h
AVComplexFloat
Definition: tx.h:27
AudioDRCContext::release
double release
Definition: af_adrc.c:63
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:313
FF_FILTER_FORWARD_STATUS_BACK
#define FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink)
Forward the status on an output link to an input link.
Definition: filters.h:199
activate
static int activate(AVFilterContext *ctx)
Definition: af_adrc.c:393
AudioDRCContext::attack
double attack
Definition: af_adrc.c:62
av_tx_init
av_cold int av_tx_init(AVTXContext **ctx, av_tx_fn *tx, enum AVTXType type, int inv, int len, const void *scale, uint64_t flags)
Initialize a transform context with the given configuration (i)MDCTs with an odd length are currently...
Definition: tx.c:903
VAR_F
@ VAR_F
Definition: af_adrc.c:51
av_expr_parse
int av_expr_parse(AVExpr **expr, const char *s, const char *const *const_names, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), int log_offset, void *log_ctx)
Parse an expression.
Definition: eval.c:710
window
static SDL_Window * window
Definition: ffplay.c:361
cosf
#define cosf(x)
Definition: libm.h:78
fail
#define fail()
Definition: checkasm.h:182
log10f
#define log10f(x)
Definition: libm.h:414
AudioDRCContext
Definition: af_adrc.c:55
pts
static int64_t pts
Definition: transcode_aac.c:644
av_expr_free
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
Definition: eval.c:358
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:33
VAR_CH
@ VAR_CH
Definition: af_adrc.c:45
AudioDRCContext::var_values
double var_values[VAR_VARS_NB]
Definition: af_adrc.c:93
av_cold
#define av_cold
Definition: attributes.h:90
AudioDRCContext::in_frame
AVFrame * in_frame
Definition: af_adrc.c:78
av_tx_fn
void(* av_tx_fn)(AVTXContext *s, void *out, void *in, ptrdiff_t stride)
Function pointer to a function to perform the transform.
Definition: tx.h:151
AudioDRCContext::channels
int channels
Definition: af_adrc.c:67
ff_outlink_set_status
static void ff_outlink_set_status(AVFilterLink *link, int status, int64_t pts)
Set the status field of a link from the source filter.
Definition: filters.h:189
ff_inlink_request_frame
void ff_inlink_request_frame(AVFilterLink *link)
Mark that a frame is wanted on the link.
Definition: avfilter.c:1568
VAR_SN
@ VAR_SN
Definition: af_adrc.c:46
s
#define s(width, name)
Definition: cbs_vp9.c:198
FLAGS
#define FLAGS
Definition: af_adrc.c:97
AV_OPT_TYPE_DOUBLE
@ AV_OPT_TYPE_DOUBLE
Definition: opt.h:247
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
filters.h
ctx
AVFormatContext * ctx
Definition: movenc.c:49
apply_window
static void apply_window(AudioDRCContext *s, const float *in_frame, float *out_frame, const int add_to_out_frame)
Definition: af_adrc.c:176
av_expr_eval
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
Evaluate a previously parsed expression.
Definition: eval.c:792
AVExpr
Definition: eval.c:158
AudioDRCContext::windowed_frame
AVFrame * windowed_frame
Definition: af_adrc.c:82
AudioDRCContext::tx_fn
av_tx_fn tx_fn
Definition: af_adrc.c:88
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:182
arg
const char * arg
Definition: jacosubdec.c:67
get_envelope
static void get_envelope(AVFilterContext *ctx, int len, float *envelope, const float *energy, const float *gain)
Definition: af_adrc.c:232
VAR_SR
@ VAR_SR
Definition: af_adrc.c:49
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
ff_inlink_consume_samples
int ff_inlink_consume_samples(AVFilterLink *link, unsigned min, unsigned max, AVFrame **rframe)
Take samples from the link's FIFO and update the link's stats.
Definition: avfilter.c:1462
NULL
#define NULL
Definition: coverity.c:32
av_frame_copy_props
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:709
AudioDRCContext::fft_size
int fft_size
Definition: af_adrc.c:65
VAR_T
@ VAR_T
Definition: af_adrc.c:48
inputs
static const AVFilterPad inputs[]
Definition: af_adrc.c:481
ff_audio_default_filterpad
const AVFilterPad ff_audio_default_filterpad[1]
An AVFilterPad array whose only entry has name "default" and is of type AVMEDIA_TYPE_AUDIO.
Definition: audio.c:33
sqrtf
static __device__ float sqrtf(float a)
Definition: cuda_runtime.h:184
double
double
Definition: af_crystalizer.c:131
AudioDRCContext::out_dist_frame
AVFrame * out_dist_frame
Definition: af_adrc.c:79
AudioDRCContext::factors
AVFrame * factors
Definition: af_adrc.c:75
get_energy
static void get_energy(AVFilterContext *ctx, int len, float *energy, const float *spectral)
Definition: af_adrc.c:196
ff_inlink_acknowledge_status
int ff_inlink_acknowledge_status(AVFilterLink *link, int *rstatus, int64_t *rpts)
Test and acknowledge the change of status on the link.
Definition: avfilter.c:1389
AudioDRCContext::window
float * window
Definition: af_adrc.c:70
eval.h
f
f
Definition: af_crystalizer.c:121
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:94
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:303
ff_af_adrc
const AVFilter ff_af_adrc
Definition: af_adrc.c:489
size
int size
Definition: twinvq_data.h:10344
drc_channels
static int drc_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: af_adrc.c:348
OFFSET
#define OFFSET(x)
Definition: af_adrc.c:96
ff_filter_process_command
int ff_filter_process_command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Generic processing of user supplied commands that are set in the same way as the filter options.
Definition: avfilter.c:887
AudioDRCContext::target_gain
AVFrame * target_gain
Definition: af_adrc.c:81
AudioDRCContext::expr_str
char * expr_str
Definition: af_adrc.c:60
AudioDRCContext::itx_ctx
AVTXContext ** itx_ctx
Definition: af_adrc.c:89
M_PI
#define M_PI
Definition: mathematics.h:67
av_tx_uninit
av_cold void av_tx_uninit(AVTXContext **ctx)
Frees a context and sets *ctx to NULL, does nothing when *ctx == NULL.
Definition: tx.c:295
AudioDRCContext::envelope
AVFrame * envelope
Definition: af_adrc.c:74
get_target_gain
static void get_target_gain(AVFilterContext *ctx, int len, float *gain, const float *energy, double *var_values, float fx, int bypass)
Definition: af_adrc.c:208
internal.h
AVChannel
AVChannel
Definition: channel_layout.h:47
av_channel_layout_from_string
int av_channel_layout_from_string(AVChannelLayout *channel_layout, const char *str)
Initialize a channel layout from a given string description.
Definition: channel_layout.c:303
AVFrame::nb_samples
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:454
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
process_command
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
Definition: af_adrc.c:465
get_factors
static void get_factors(AVFilterContext *ctx, int len, float *factors, const float *envelope)
Definition: af_adrc.c:256
envelope
static float envelope(const float x)
Definition: vf_monochrome.c:45
AVFrame::extended_data
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:435
AudioDRCContext::energy
AVFrame * energy
Definition: af_adrc.c:73
ff_filter_get_nb_threads
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Definition: avfilter.c:827
AudioDRCContext::release_ms
double release_ms
Definition: af_adrc.c:59
value
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default value
Definition: writing_filters.txt:86
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
AudioDRCContext::in
AVFrame * in
Definition: af_adrc.c:76
len
int len
Definition: vorbis_enc_data.h:426
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:39
ff_inlink_queued_samples
int ff_inlink_queued_samples(AVFilterLink *link)
Definition: avfilter.c:1417
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Definition: mem.c:264
AudioDRCContext::in_buffer
AVFrame * in_buffer
Definition: af_adrc.c:77
var_names
static const char *const var_names[]
Definition: af_adrc.c:33
VAR_NB_CHANNELS
@ VAR_NB_CHANNELS
Definition: af_adrc.c:47
AVFilter
Filter definition.
Definition: avfilter.h:166
AudioDRCContext::tx_ctx
AVTXContext ** tx_ctx
Definition: af_adrc.c:87
ret
ret
Definition: filter_design.txt:187
AV_TX_FLOAT_RDFT
@ AV_TX_FLOAT_RDFT
Real to complex and complex to real DFTs.
Definition: tx.h:90
VAR_VARS_NB
@ VAR_VARS_NB
Definition: af_adrc.c:52
status
ov_status_e status
Definition: dnn_backend_openvino.c:101
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_adrc.c:432
av_channel_layout_index_from_channel
int av_channel_layout_index_from_channel(const AVChannelLayout *channel_layout, enum AVChannel channel)
Get the index of a given channel in a channel layout.
Definition: channel_layout.c:705
AudioDRCContext::drc_frame
AVFrame * drc_frame
Definition: af_adrc.c:72
avfilter.h
av_channel_layout_uninit
void av_channel_layout_uninit(AVChannelLayout *channel_layout)
Free any allocated data in the channel layout and reset the channel count to 0.
Definition: channel_layout.c:433
ffmath.h
VAR_P
@ VAR_P
Definition: af_adrc.c:50
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(adrc)
AVFilterContext
An instance of a filter.
Definition: avfilter.h:407
av_channel_layout_copy
int av_channel_layout_copy(AVChannelLayout *dst, const AVChannelLayout *src)
Make a copy of a channel layout.
Definition: channel_layout.c:440
drc_channel
static int drc_channel(AVFilterContext *ctx, AVFrame *in, AVFrame *out, int ch)
Definition: af_adrc.c:325
AVFILTER_FLAG_SLICE_THREADS
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
Definition: avfilter.h:117
av_strdup
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:272
AudioDRCContext::spectrum_buf
AVFrame * spectrum_buf
Definition: af_adrc.c:80
mem.h
audio.h
AudioDRCContext::attack_ms
double attack_ms
Definition: af_adrc.c:58
AudioDRCContext::overlap
int overlap
Definition: af_adrc.c:66
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
scale
static void scale(int *out, const int *in, const int w, const int h, const int shift)
Definition: intra.c:291
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:183
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL
#define AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL
Same as AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, except that the filter will have its filter_frame() c...
Definition: avfilter.h:155
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
ff_exp10f
static av_always_inline float ff_exp10f(float x)
Definition: ffmath.h:47
apply_factors
static void apply_factors(AVFilterContext *ctx, int len, float *spectrum, const float *factors)
Definition: af_adrc.c:265
ff_outlink_frame_wanted
the definition of that something depends on the semantic of the filter The callback must examine the status of the filter s links and proceed accordingly The status of output links is stored in the status_in and status_out fields and tested by the ff_outlink_frame_wanted() function. If this function returns true
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:249
ff_filter_execute
static av_always_inline int ff_filter_execute(AVFilterContext *ctx, avfilter_action_func *func, void *arg, int *ret, int nb_jobs)
Definition: internal.h:134
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: af_adrc.c:362
config_input
static int config_input(AVFilterLink *inlink)
Definition: af_adrc.c:118
channel
channel
Definition: ebur128.h:39
ff_filter_set_ready
void ff_filter_set_ready(AVFilterContext *filter, unsigned priority)
Mark a filter ready and schedule it for activation.
Definition: avfilter.c:235
tx.h
sqrf
static float sqrf(float x)
Definition: af_adrc.c:191
AudioDRCContext::channels_to_filter
char * channels_to_filter
Definition: af_adrc.c:84