FFmpeg
af_asupercut.c
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1 /*
2  * Copyright (c) 2005 Boðaç Topaktaþ
3  * Copyright (c) 2020 Paul B Mahol
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
23 #include "libavutil/ffmath.h"
24 #include "libavutil/opt.h"
25 #include "avfilter.h"
26 #include "audio.h"
27 #include "formats.h"
28 
29 typedef struct BiquadCoeffs {
30  double a1, a2;
31  double b0, b1, b2;
32 } BiquadCoeffs;
33 
34 typedef struct ASuperCutContext {
35  const AVClass *class;
36 
37  double cutoff;
38  double level;
39  double qfactor;
40  int order;
41 
43  int bypass;
44 
46 
48 
49  int (*filter_channels)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
51 
53 {
56  static const enum AVSampleFormat sample_fmts[] = {
60  };
61  int ret;
62 
64  if (!formats)
65  return AVERROR(ENOMEM);
67  if (ret < 0)
68  return ret;
69 
71  if (!layouts)
72  return AVERROR(ENOMEM);
73 
75  if (ret < 0)
76  return ret;
77 
80 }
81 
82 static void calc_q_factors(int n, double *q)
83 {
84  for (int i = 0; i < n / 2; i++)
85  q[i] = 1. / (-2. * cos(M_PI * (2. * (i + 1) + n - 1.) / (2. * n)));
86 }
87 
89 {
90  ASuperCutContext *s = ctx->priv;
91  AVFilterLink *inlink = ctx->inputs[0];
92  double w0 = s->cutoff / inlink->sample_rate;
93  double K = tan(M_PI * w0);
94  double q[10];
95 
96  s->bypass = w0 >= 0.5;
97  if (s->bypass)
98  return 0;
99 
100  if (!strcmp(ctx->filter->name, "asubcut")) {
101  s->filter_count = s->order / 2 + (s->order & 1);
102 
103  calc_q_factors(s->order, q);
104 
105  if (s->order & 1) {
106  BiquadCoeffs *coeffs = &s->coeffs[0];
107  double omega = 2. * tan(M_PI * w0);
108 
109  coeffs->b0 = 2. / (2. + omega);
110  coeffs->b1 = -coeffs->b0;
111  coeffs->b2 = 0.;
112  coeffs->a1 = -(omega - 2.) / (2. + omega);
113  coeffs->a2 = 0.;
114  }
115 
116  for (int b = (s->order & 1); b < s->filter_count; b++) {
117  BiquadCoeffs *coeffs = &s->coeffs[b];
118  const int idx = b - (s->order & 1);
119  double norm = 1.0 / (1.0 + K / q[idx] + K * K);
120 
121  coeffs->b0 = norm;
122  coeffs->b1 = -2.0 * coeffs->b0;
123  coeffs->b2 = coeffs->b0;
124  coeffs->a1 = -2.0 * (K * K - 1.0) * norm;
125  coeffs->a2 = -(1.0 - K / q[idx] + K * K) * norm;
126  }
127  } else if (!strcmp(ctx->filter->name, "asupercut")) {
128  s->filter_count = s->order / 2 + (s->order & 1);
129 
130  calc_q_factors(s->order, q);
131 
132  if (s->order & 1) {
133  BiquadCoeffs *coeffs = &s->coeffs[0];
134  double omega = 2. * tan(M_PI * w0);
135 
136  coeffs->b0 = omega / (2. + omega);
137  coeffs->b1 = coeffs->b0;
138  coeffs->b2 = 0.;
139  coeffs->a1 = -(omega - 2.) / (2. + omega);
140  coeffs->a2 = 0.;
141  }
142 
143  for (int b = (s->order & 1); b < s->filter_count; b++) {
144  BiquadCoeffs *coeffs = &s->coeffs[b];
145  const int idx = b - (s->order & 1);
146  double norm = 1.0 / (1.0 + K / q[idx] + K * K);
147 
148  coeffs->b0 = K * K * norm;
149  coeffs->b1 = 2.0 * coeffs->b0;
150  coeffs->b2 = coeffs->b0;
151  coeffs->a1 = -2.0 * (K * K - 1.0) * norm;
152  coeffs->a2 = -(1.0 - K / q[idx] + K * K) * norm;
153  }
154  } else if (!strcmp(ctx->filter->name, "asuperpass")) {
155  double alpha, beta, gamma, theta;
156  double theta_0 = 2. * M_PI * (s->cutoff / inlink->sample_rate);
157  double d_E;
158 
159  s->filter_count = s->order / 2;
160  d_E = (2. * tan(theta_0 / (2. * s->qfactor))) / sin(theta_0);
161 
162  for (int b = 0; b < s->filter_count; b += 2) {
163  double D = 2. * sin(((b + 1) * M_PI) / (2. * s->filter_count));
164  double A = (1. + pow((d_E / 2.), 2)) / (D * d_E / 2.);
165  double d = sqrt((d_E * D) / (A + sqrt(A * A - 1.)));
166  double B = D * (d_E / 2.) / d;
167  double W = B + sqrt(B * B - 1.);
168 
169  for (int j = 0; j < 2; j++) {
170  BiquadCoeffs *coeffs = &s->coeffs[b + j];
171 
172  if (j == 1)
173  theta = 2. * atan(tan(theta_0 / 2.) / W);
174  else
175  theta = 2. * atan(W * tan(theta_0 / 2.));
176 
177  beta = 0.5 * ((1. - (d / 2.) * sin(theta)) / (1. + (d / 2.) * sin(theta)));
178  gamma = (0.5 + beta) * cos(theta);
179  alpha = 0.5 * (0.5 - beta) * sqrt(1. + pow((W - (1. / W)) / d, 2.));
180 
181  coeffs->a1 = 2. * gamma;
182  coeffs->a2 = -2. * beta;
183  coeffs->b0 = 2. * alpha;
184  coeffs->b1 = 0.;
185  coeffs->b2 = -2. * alpha;
186  }
187  }
188  } else if (!strcmp(ctx->filter->name, "asuperstop")) {
189  double alpha, beta, gamma, theta;
190  double theta_0 = 2. * M_PI * (s->cutoff / inlink->sample_rate);
191  double d_E;
192 
193  s->filter_count = s->order / 2;
194  d_E = (2. * tan(theta_0 / (2. * s->qfactor))) / sin(theta_0);
195 
196  for (int b = 0; b < s->filter_count; b += 2) {
197  double D = 2. * sin(((b + 1) * M_PI) / (2. * s->filter_count));
198  double A = (1. + pow((d_E / 2.), 2)) / (D * d_E / 2.);
199  double d = sqrt((d_E * D) / (A + sqrt(A * A - 1.)));
200  double B = D * (d_E / 2.) / d;
201  double W = B + sqrt(B * B - 1.);
202 
203  for (int j = 0; j < 2; j++) {
204  BiquadCoeffs *coeffs = &s->coeffs[b + j];
205 
206  if (j == 1)
207  theta = 2. * atan(tan(theta_0 / 2.) / W);
208  else
209  theta = 2. * atan(W * tan(theta_0 / 2.));
210 
211  beta = 0.5 * ((1. - (d / 2.) * sin(theta)) / (1. + (d / 2.) * sin(theta)));
212  gamma = (0.5 + beta) * cos(theta);
213  alpha = 0.5 * (0.5 + beta) * ((1. - cos(theta)) / (1. - cos(theta_0)));
214 
215  coeffs->a1 = 2. * gamma;
216  coeffs->a2 = -2. * beta;
217  coeffs->b0 = 2. * alpha;
218  coeffs->b1 = -4. * alpha * cos(theta_0);
219  coeffs->b2 = 2. * alpha;
220  }
221  }
222  }
223 
224  return 0;
225 }
226 
227 typedef struct ThreadData {
228  AVFrame *in, *out;
229 } ThreadData;
230 
231 #define FILTER(name, type) \
232 static int filter_channels_## name(AVFilterContext *ctx, void *arg, \
233  int jobnr, int nb_jobs) \
234 { \
235  ASuperCutContext *s = ctx->priv; \
236  ThreadData *td = arg; \
237  AVFrame *out = td->out; \
238  AVFrame *in = td->in; \
239  const int start = (in->channels * jobnr) / nb_jobs; \
240  const int end = (in->channels * (jobnr+1)) / nb_jobs; \
241  const double level = s->level; \
242  \
243  for (int ch = start; ch < end; ch++) { \
244  const type *src = (const type *)in->extended_data[ch]; \
245  type *dst = (type *)out->extended_data[ch]; \
246  \
247  for (int b = 0; b < s->filter_count; b++) { \
248  BiquadCoeffs *coeffs = &s->coeffs[b]; \
249  const type a1 = coeffs->a1; \
250  const type a2 = coeffs->a2; \
251  const type b0 = coeffs->b0; \
252  const type b1 = coeffs->b1; \
253  const type b2 = coeffs->b2; \
254  type *w = ((type *)s->w->extended_data[ch]) + b * 2; \
255  \
256  for (int n = 0; n < in->nb_samples; n++) { \
257  type sin = b ? dst[n] : src[n] * level; \
258  type sout = sin * b0 + w[0]; \
259  \
260  w[0] = b1 * sin + w[1] + a1 * sout; \
261  w[1] = b2 * sin + a2 * sout; \
262  \
263  dst[n] = sout; \
264  } \
265  } \
266  } \
267  \
268  return 0; \
269 }
270 
271 FILTER(fltp, float)
272 FILTER(dblp, double)
273 
275 {
276  AVFilterContext *ctx = inlink->dst;
277  ASuperCutContext *s = ctx->priv;
278 
279  switch (inlink->format) {
280  case AV_SAMPLE_FMT_FLTP: s->filter_channels = filter_channels_fltp; break;
281  case AV_SAMPLE_FMT_DBLP: s->filter_channels = filter_channels_dblp; break;
282  }
283 
284  s->w = ff_get_audio_buffer(inlink, 2 * 10);
285  if (!s->w)
286  return AVERROR(ENOMEM);
287 
288  return get_coeffs(ctx);
289 }
290 
292 {
293  AVFilterContext *ctx = inlink->dst;
294  ASuperCutContext *s = ctx->priv;
295  AVFilterLink *outlink = ctx->outputs[0];
296  ThreadData td;
297  AVFrame *out;
298 
299  if (s->bypass)
300  return ff_filter_frame(outlink, in);
301 
302  if (av_frame_is_writable(in)) {
303  out = in;
304  } else {
305  out = ff_get_audio_buffer(outlink, in->nb_samples);
306  if (!out) {
307  av_frame_free(&in);
308  return AVERROR(ENOMEM);
309  }
311  }
312 
313  td.in = in; td.out = out;
314  ctx->internal->execute(ctx, s->filter_channels, &td, NULL, FFMIN(inlink->channels,
316 
317  if (out != in)
318  av_frame_free(&in);
319  return ff_filter_frame(outlink, out);
320 }
321 
322 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
323  char *res, int res_len, int flags)
324 {
325  int ret;
326 
327  ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
328  if (ret < 0)
329  return ret;
330 
331  return get_coeffs(ctx);
332 }
333 
335 {
336  ASuperCutContext *s = ctx->priv;
337 
338  av_frame_free(&s->w);
339 }
340 
341 #define OFFSET(x) offsetof(ASuperCutContext, x)
342 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
343 
344 static const AVOption asupercut_options[] = {
345  { "cutoff", "set cutoff frequency", OFFSET(cutoff), AV_OPT_TYPE_DOUBLE, {.dbl=20000}, 20000, 192000, FLAGS },
346  { "order", "set filter order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=10}, 3, 20, FLAGS },
347  { "level", "set input level", OFFSET(level), AV_OPT_TYPE_DOUBLE, {.dbl=1.}, 0., 1., FLAGS },
348  { NULL }
349 };
350 
351 AVFILTER_DEFINE_CLASS(asupercut);
352 
353 static const AVFilterPad inputs[] = {
354  {
355  .name = "default",
356  .type = AVMEDIA_TYPE_AUDIO,
357  .filter_frame = filter_frame,
358  .config_props = config_input,
359  },
360  { NULL }
361 };
362 
363 static const AVFilterPad outputs[] = {
364  {
365  .name = "default",
366  .type = AVMEDIA_TYPE_AUDIO,
367  },
368  { NULL }
369 };
370 
372  .name = "asupercut",
373  .description = NULL_IF_CONFIG_SMALL("Cut super frequencies."),
374  .query_formats = query_formats,
375  .priv_size = sizeof(ASuperCutContext),
376  .priv_class = &asupercut_class,
377  .uninit = uninit,
378  .inputs = inputs,
379  .outputs = outputs,
383 };
384 
385 static const AVOption asubcut_options[] = {
386  { "cutoff", "set cutoff frequency", OFFSET(cutoff), AV_OPT_TYPE_DOUBLE, {.dbl=20}, 2, 200, FLAGS },
387  { "order", "set filter order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=10}, 3, 20, FLAGS },
388  { "level", "set input level", OFFSET(level), AV_OPT_TYPE_DOUBLE, {.dbl=1.}, 0., 1., FLAGS },
389  { NULL }
390 };
391 
392 AVFILTER_DEFINE_CLASS(asubcut);
393 
395  .name = "asubcut",
396  .description = NULL_IF_CONFIG_SMALL("Cut subwoofer frequencies."),
397  .query_formats = query_formats,
398  .priv_size = sizeof(ASuperCutContext),
399  .priv_class = &asubcut_class,
400  .uninit = uninit,
401  .inputs = inputs,
402  .outputs = outputs,
406 };
407 
409  { "centerf","set center frequency", OFFSET(cutoff), AV_OPT_TYPE_DOUBLE, {.dbl=1000}, 2, 999999, FLAGS },
410  { "order", "set filter order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=4}, 4, 20, FLAGS },
411  { "qfactor","set Q-factor", OFFSET(qfactor),AV_OPT_TYPE_DOUBLE, {.dbl=1.},0.01, 100., FLAGS },
412  { "level", "set input level", OFFSET(level), AV_OPT_TYPE_DOUBLE, {.dbl=1.}, 0., 2., FLAGS },
413  { NULL }
414 };
415 
416 #define asuperpass_options asuperpass_asuperstop_options
417 AVFILTER_DEFINE_CLASS(asuperpass);
418 
420  .name = "asuperpass",
421  .description = NULL_IF_CONFIG_SMALL("Apply high order Butterworth band-pass filter."),
422  .query_formats = query_formats,
423  .priv_size = sizeof(ASuperCutContext),
424  .priv_class = &asuperpass_class,
425  .uninit = uninit,
426  .inputs = inputs,
427  .outputs = outputs,
431 };
432 
433 #define asuperstop_options asuperpass_asuperstop_options
434 AVFILTER_DEFINE_CLASS(asuperstop);
435 
437  .name = "asuperstop",
438  .description = NULL_IF_CONFIG_SMALL("Apply high order Butterworth band-stop filter."),
439  .query_formats = query_formats,
440  .priv_size = sizeof(ASuperCutContext),
441  .priv_class = &asuperstop_class,
442  .uninit = uninit,
443  .inputs = inputs,
444  .outputs = outputs,
448 };
ff_af_asuperpass
const AVFilter ff_af_asuperpass
Definition: af_asupercut.c:419
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
asupercut_options
static const AVOption asupercut_options[]
Definition: af_asupercut.c:344
AV_SAMPLE_FMT_FLTP
@ AV_SAMPLE_FMT_FLTP
float, planar
Definition: samplefmt.h:69
AVFilterChannelLayouts
A list of supported channel layouts.
Definition: formats.h:86
td
#define td
Definition: regdef.h:70
FLAGS
#define FLAGS
Definition: af_asupercut.c:342
config_input
static int config_input(AVFilterLink *inlink)
Definition: af_asupercut.c:274
level
uint8_t level
Definition: svq3.c:204
W
@ W
Definition: vf_addroi.c:26
ASuperCutContext
Definition: af_asupercut.c:34
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
out
FILE * out
Definition: movenc.c:54
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
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: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
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
AVOption
AVOption.
Definition: opt.h:248
b
#define b
Definition: input.c:41
calc_q_factors
static void calc_q_factors(int n, double *q)
Definition: af_asupercut.c:82
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:149
ThreadData::out
AVFrame * out
Definition: af_adeclick.c:502
AVFormatContext::internal
AVFormatInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1554
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: af_asupercut.c:52
D
D(D(float, sse)
Definition: rematrix_init.c:29
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:65
formats.h
BiquadCoeffs::a1
double a1
Definition: af_aemphasis.c:27
A
#define A(x)
Definition: vp56_arith.h:28
BiquadCoeffs
Definition: af_acrossover.c:48
ASuperCutContext::order
int order
Definition: af_asupercut.c:40
ff_af_asupercut
const AVFilter ff_af_asupercut
Definition: af_asupercut.c:371
BiquadCoeffs::a2
double a2
Definition: af_aemphasis.c:27
BiquadCoeffs::b2
double b2
Definition: af_aemphasis.c:27
FILTER
#define FILTER(name, type)
Definition: af_asupercut.c:231
get_coeffs
static int get_coeffs(AVFilterContext *ctx)
Definition: af_asupercut.c:88
ASuperCutContext::coeffs
BiquadCoeffs coeffs[10]
Definition: af_asupercut.c:45
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:54
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(asupercut)
av_cold
#define av_cold
Definition: attributes.h:90
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
AV_OPT_TYPE_DOUBLE
@ AV_OPT_TYPE_DOUBLE
Definition: opt.h:227
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
ctx
AVFormatContext * ctx
Definition: movenc.c:48
OFFSET
#define OFFSET(x)
Definition: af_asupercut.c:341
ASuperCutContext::qfactor
double qfactor
Definition: af_asupercut.c:39
arg
const char * arg
Definition: jacosubdec.c:67
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
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:536
ff_af_asuperstop
const AVFilter ff_af_asuperstop
Definition: af_asupercut.c:436
BiquadCoeffs::b0
double b0
Definition: af_asupercut.c:31
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
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
ff_af_asubcut
const AVFilter ff_af_asubcut
Definition: af_asupercut.c:394
asubcut_options
static const AVOption asubcut_options[]
Definition: af_asupercut.c:385
av_frame_is_writable
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Definition: frame.c:472
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:842
FFMIN
#define FFMIN(a, b)
Definition: common.h:105
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_asupercut.c:334
ASuperCutContext::filter_channels
int(* filter_channels)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: af_asupercut.c:49
M_PI
#define M_PI
Definition: mathematics.h:52
AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
Definition: avfilter.h:126
AVFrame::nb_samples
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:369
i
int i
Definition: input.c:407
inputs
static const AVFilterPad inputs[]
Definition: af_asupercut.c:353
ff_filter_get_nb_threads
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Definition: avfilter.c:762
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
ThreadData
Used for passing data between threads.
Definition: dsddec.c:67
asuperpass_asuperstop_options
static const AVOption asuperpass_asuperstop_options[]
Definition: af_asupercut.c:408
ASuperCutContext::cutoff
double cutoff
Definition: af_asupercut.c:37
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:60
BiquadCoeffs::b1
double b1
Definition: af_aemphasis.c:27
AVFilter
Filter definition.
Definition: avfilter.h:145
ret
ret
Definition: filter_design.txt:187
B
#define B
Definition: huffyuvdsp.h:32
ff_all_samplerates
AVFilterFormats * ff_all_samplerates(void)
Definition: formats.c:414
channel_layout.h
ASuperCutContext::filter_count
int filter_count
Definition: af_asupercut.c:42
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
avfilter.h
process_command
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
Definition: af_asupercut.c:322
AV_SAMPLE_FMT_DBLP
@ AV_SAMPLE_FMT_DBLP
double, planar
Definition: samplefmt.h:70
ffmath.h
AVFilterContext
An instance of a filter.
Definition: avfilter.h:333
ASuperCutContext::bypass
int bypass
Definition: af_asupercut.c:43
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
audio.h
ThreadData::in
AVFrame * in
Definition: af_adenorm.c:223
alpha
static const int16_t alpha[]
Definition: ilbcdata.h:55
ASuperCutContext::level
double level
Definition: af_asupercut.c:38
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: af_asupercut.c:291
d
d
Definition: ffmpeg_filter.c:156
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
ff_set_common_samplerates
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:568
int
int
Definition: ffmpeg_filter.c:156
ASuperCutContext::w
AVFrame * w
Definition: af_asupercut.c:47
outputs
static const AVFilterPad outputs[]
Definition: af_asupercut.c:363
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