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 
22 #include "libavutil/channel_layout.h"
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 
42  int filter_count;
43  int bypass;
44 
45  BiquadCoeffs coeffs[10];
46 
47  AVFrame *w;
48 
49  int (*filter_channels)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
50 } ASuperCutContext;
51 
52 static const enum AVSampleFormat sample_fmts[] = {
53  AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_DBLP, AV_SAMPLE_FMT_NONE
54 };
55 
56 static void calc_q_factors(int n, double *q)
57 {
58  for (int i = 0; i < n / 2; i++)
59  q[i] = 1. / (-2. * cos(M_PI * (2. * (i + 1) + n - 1.) / (2. * n)));
60 }
61 
62 static int get_coeffs(AVFilterContext *ctx)
63 {
64  ASuperCutContext *s = ctx->priv;
65  AVFilterLink *inlink = ctx->inputs[0];
66  double w0 = s->cutoff / inlink->sample_rate;
67  double K = tan(M_PI * w0);
68  double q[10];
69 
70  s->bypass = w0 >= 0.5;
71  if (s->bypass)
72  return 0;
73 
74  if (!strcmp(ctx->filter->name, "asubcut")) {
75  s->filter_count = s->order / 2 + (s->order & 1);
76 
77  calc_q_factors(s->order, q);
78 
79  if (s->order & 1) {
80  BiquadCoeffs *coeffs = &s->coeffs[0];
81  double omega = 2. * tan(M_PI * w0);
82 
83  coeffs->b0 = 2. / (2. + omega);
84  coeffs->b1 = -coeffs->b0;
85  coeffs->b2 = 0.;
86  coeffs->a1 = -(omega - 2.) / (2. + omega);
87  coeffs->a2 = 0.;
88  }
89 
90  for (int b = (s->order & 1); b < s->filter_count; b++) {
91  BiquadCoeffs *coeffs = &s->coeffs[b];
92  const int idx = b - (s->order & 1);
93  double norm = 1.0 / (1.0 + K / q[idx] + K * K);
94 
95  coeffs->b0 = norm;
96  coeffs->b1 = -2.0 * coeffs->b0;
97  coeffs->b2 = coeffs->b0;
98  coeffs->a1 = -2.0 * (K * K - 1.0) * norm;
99  coeffs->a2 = -(1.0 - K / q[idx] + K * K) * norm;
100  }
101  } else if (!strcmp(ctx->filter->name, "asupercut")) {
102  s->filter_count = s->order / 2 + (s->order & 1);
103 
104  calc_q_factors(s->order, q);
105 
106  if (s->order & 1) {
107  BiquadCoeffs *coeffs = &s->coeffs[0];
108  double omega = 2. * tan(M_PI * w0);
109 
110  coeffs->b0 = omega / (2. + omega);
111  coeffs->b1 = coeffs->b0;
112  coeffs->b2 = 0.;
113  coeffs->a1 = -(omega - 2.) / (2. + omega);
114  coeffs->a2 = 0.;
115  }
116 
117  for (int b = (s->order & 1); b < s->filter_count; b++) {
118  BiquadCoeffs *coeffs = &s->coeffs[b];
119  const int idx = b - (s->order & 1);
120  double norm = 1.0 / (1.0 + K / q[idx] + K * K);
121 
122  coeffs->b0 = K * K * norm;
123  coeffs->b1 = 2.0 * coeffs->b0;
124  coeffs->b2 = coeffs->b0;
125  coeffs->a1 = -2.0 * (K * K - 1.0) * norm;
126  coeffs->a2 = -(1.0 - K / q[idx] + K * K) * norm;
127  }
128  } else if (!strcmp(ctx->filter->name, "asuperpass")) {
129  double alpha, beta, gamma, theta;
130  double theta_0 = 2. * M_PI * (s->cutoff / inlink->sample_rate);
131  double d_E;
132 
133  s->filter_count = s->order / 2;
134  d_E = (2. * tan(theta_0 / (2. * s->qfactor))) / sin(theta_0);
135 
136  for (int b = 0; b < s->filter_count; b += 2) {
137  double D = 2. * sin(((b + 1) * M_PI) / (2. * s->filter_count));
138  double A = (1. + pow((d_E / 2.), 2)) / (D * d_E / 2.);
139  double d = sqrt((d_E * D) / (A + sqrt(A * A - 1.)));
140  double B = D * (d_E / 2.) / d;
141  double W = B + sqrt(B * B - 1.);
142 
143  for (int j = 0; j < 2; j++) {
144  BiquadCoeffs *coeffs = &s->coeffs[b + j];
145 
146  if (j == 1)
147  theta = 2. * atan(tan(theta_0 / 2.) / W);
148  else
149  theta = 2. * atan(W * tan(theta_0 / 2.));
150 
151  beta = 0.5 * ((1. - (d / 2.) * sin(theta)) / (1. + (d / 2.) * sin(theta)));
152  gamma = (0.5 + beta) * cos(theta);
153  alpha = 0.5 * (0.5 - beta) * sqrt(1. + pow((W - (1. / W)) / d, 2.));
154 
155  coeffs->a1 = 2. * gamma;
156  coeffs->a2 = -2. * beta;
157  coeffs->b0 = 2. * alpha;
158  coeffs->b1 = 0.;
159  coeffs->b2 = -2. * alpha;
160  }
161  }
162  } else if (!strcmp(ctx->filter->name, "asuperstop")) {
163  double alpha, beta, gamma, theta;
164  double theta_0 = 2. * M_PI * (s->cutoff / inlink->sample_rate);
165  double d_E;
166 
167  s->filter_count = s->order / 2;
168  d_E = (2. * tan(theta_0 / (2. * s->qfactor))) / sin(theta_0);
169 
170  for (int b = 0; b < s->filter_count; b += 2) {
171  double D = 2. * sin(((b + 1) * M_PI) / (2. * s->filter_count));
172  double A = (1. + pow((d_E / 2.), 2)) / (D * d_E / 2.);
173  double d = sqrt((d_E * D) / (A + sqrt(A * A - 1.)));
174  double B = D * (d_E / 2.) / d;
175  double W = B + sqrt(B * B - 1.);
176 
177  for (int j = 0; j < 2; j++) {
178  BiquadCoeffs *coeffs = &s->coeffs[b + j];
179 
180  if (j == 1)
181  theta = 2. * atan(tan(theta_0 / 2.) / W);
182  else
183  theta = 2. * atan(W * tan(theta_0 / 2.));
184 
185  beta = 0.5 * ((1. - (d / 2.) * sin(theta)) / (1. + (d / 2.) * sin(theta)));
186  gamma = (0.5 + beta) * cos(theta);
187  alpha = 0.5 * (0.5 + beta) * ((1. - cos(theta)) / (1. - cos(theta_0)));
188 
189  coeffs->a1 = 2. * gamma;
190  coeffs->a2 = -2. * beta;
191  coeffs->b0 = 2. * alpha;
192  coeffs->b1 = -4. * alpha * cos(theta_0);
193  coeffs->b2 = 2. * alpha;
194  }
195  }
196  }
197 
198  return 0;
199 }
200 
201 typedef struct ThreadData {
202  AVFrame *in, *out;
203 } ThreadData;
204 
205 #define FILTER(name, type) \
206 static int filter_channels_## name(AVFilterContext *ctx, void *arg, \
207  int jobnr, int nb_jobs) \
208 { \
209  ASuperCutContext *s = ctx->priv; \
210  ThreadData *td = arg; \
211  AVFrame *out = td->out; \
212  AVFrame *in = td->in; \
213  const int start = (in->ch_layout.nb_channels * jobnr) / nb_jobs; \
214  const int end = (in->ch_layout.nb_channels * (jobnr+1)) / nb_jobs; \
215  const double level = s->level; \
216  \
217  for (int ch = start; ch < end; ch++) { \
218  const type *src = (const type *)in->extended_data[ch]; \
219  type *dst = (type *)out->extended_data[ch]; \
220  \
221  for (int b = 0; b < s->filter_count; b++) { \
222  BiquadCoeffs *coeffs = &s->coeffs[b]; \
223  const type a1 = coeffs->a1; \
224  const type a2 = coeffs->a2; \
225  const type b0 = coeffs->b0; \
226  const type b1 = coeffs->b1; \
227  const type b2 = coeffs->b2; \
228  type *w = ((type *)s->w->extended_data[ch]) + b * 2; \
229  \
230  for (int n = 0; n < in->nb_samples; n++) { \
231  type sin = b ? dst[n] : src[n] * level; \
232  type sout = sin * b0 + w[0]; \
233  \
234  w[0] = b1 * sin + w[1] + a1 * sout; \
235  w[1] = b2 * sin + a2 * sout; \
236  \
237  dst[n] = sout; \
238  } \
239  } \
240  } \
241  \
242  return 0; \
243 }
244 
245 FILTER(fltp, float)
246 FILTER(dblp, double)
247 
248 static int config_input(AVFilterLink *inlink)
249 {
250  AVFilterContext *ctx = inlink->dst;
251  ASuperCutContext *s = ctx->priv;
252 
253  switch (inlink->format) {
254  case AV_SAMPLE_FMT_FLTP: s->filter_channels = filter_channels_fltp; break;
255  case AV_SAMPLE_FMT_DBLP: s->filter_channels = filter_channels_dblp; break;
256  }
257 
258  s->w = ff_get_audio_buffer(inlink, 2 * 10);
259  if (!s->w)
260  return AVERROR(ENOMEM);
261 
262  return get_coeffs(ctx);
263 }
264 
265 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
266 {
267  AVFilterContext *ctx = inlink->dst;
268  ASuperCutContext *s = ctx->priv;
269  AVFilterLink *outlink = ctx->outputs[0];
270  ThreadData td;
271  AVFrame *out;
272 
273  if (s->bypass)
274  return ff_filter_frame(outlink, in);
275 
276  if (av_frame_is_writable(in)) {
277  out = in;
278  } else {
279  out = ff_get_audio_buffer(outlink, in->nb_samples);
280  if (!out) {
281  av_frame_free(&in);
282  return AVERROR(ENOMEM);
283  }
284  av_frame_copy_props(out, in);
285  }
286 
287  td.in = in; td.out = out;
288  ff_filter_execute(ctx, s->filter_channels, &td, NULL,
289  FFMIN(inlink->ch_layout.nb_channels, ff_filter_get_nb_threads(ctx)));
290 
291  if (out != in)
292  av_frame_free(&in);
293  return ff_filter_frame(outlink, out);
294 }
295 
296 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
297  char *res, int res_len, int flags)
298 {
299  int ret;
300 
301  ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
302  if (ret < 0)
303  return ret;
304 
305  return get_coeffs(ctx);
306 }
307 
308 static av_cold void uninit(AVFilterContext *ctx)
309 {
310  ASuperCutContext *s = ctx->priv;
311 
312  av_frame_free(&s->w);
313 }
314 
315 #define OFFSET(x) offsetof(ASuperCutContext, x)
316 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
317 
318 static const AVOption asupercut_options[] = {
319  { "cutoff", "set cutoff frequency", OFFSET(cutoff), AV_OPT_TYPE_DOUBLE, {.dbl=20000}, 20000, 192000, FLAGS },
320  { "order", "set filter order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=10}, 3, 20, FLAGS },
321  { "level", "set input level", OFFSET(level), AV_OPT_TYPE_DOUBLE, {.dbl=1.}, 0., 1., FLAGS },
322  { NULL }
323 };
324 
325 AVFILTER_DEFINE_CLASS(asupercut);
326 
327 static const AVFilterPad inputs[] = {
328  {
329  .name = "default",
330  .type = AVMEDIA_TYPE_AUDIO,
331  .filter_frame = filter_frame,
332  .config_props = config_input,
333  },
334 };
335 
336 static const AVFilterPad outputs[] = {
337  {
338  .name = "default",
339  .type = AVMEDIA_TYPE_AUDIO,
340  },
341 };
342 
343 const AVFilter ff_af_asupercut = {
344  .name = "asupercut",
345  .description = NULL_IF_CONFIG_SMALL("Cut super frequencies."),
346  .priv_size = sizeof(ASuperCutContext),
347  .priv_class = &asupercut_class,
348  .uninit = uninit,
349  FILTER_INPUTS(inputs),
350  FILTER_OUTPUTS(outputs),
351  FILTER_SAMPLEFMTS_ARRAY(sample_fmts),
352  .process_command = process_command,
353  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
354  AVFILTER_FLAG_SLICE_THREADS,
355 };
356 
357 static const AVOption asubcut_options[] = {
358  { "cutoff", "set cutoff frequency", OFFSET(cutoff), AV_OPT_TYPE_DOUBLE, {.dbl=20}, 2, 200, FLAGS },
359  { "order", "set filter order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=10}, 3, 20, FLAGS },
360  { "level", "set input level", OFFSET(level), AV_OPT_TYPE_DOUBLE, {.dbl=1.}, 0., 1., FLAGS },
361  { NULL }
362 };
363 
364 AVFILTER_DEFINE_CLASS(asubcut);
365 
366 const AVFilter ff_af_asubcut = {
367  .name = "asubcut",
368  .description = NULL_IF_CONFIG_SMALL("Cut subwoofer frequencies."),
369  .priv_size = sizeof(ASuperCutContext),
370  .priv_class = &asubcut_class,
371  .uninit = uninit,
372  FILTER_INPUTS(inputs),
373  FILTER_OUTPUTS(outputs),
374  FILTER_SAMPLEFMTS_ARRAY(sample_fmts),
375  .process_command = process_command,
376  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
377  AVFILTER_FLAG_SLICE_THREADS,
378 };
379 
380 static const AVOption asuperpass_asuperstop_options[] = {
381  { "centerf","set center frequency", OFFSET(cutoff), AV_OPT_TYPE_DOUBLE, {.dbl=1000}, 2, 999999, FLAGS },
382  { "order", "set filter order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=4}, 4, 20, FLAGS },
383  { "qfactor","set Q-factor", OFFSET(qfactor),AV_OPT_TYPE_DOUBLE, {.dbl=1.},0.01, 100., FLAGS },
384  { "level", "set input level", OFFSET(level), AV_OPT_TYPE_DOUBLE, {.dbl=1.}, 0., 2., FLAGS },
385  { NULL }
386 };
387 
388 AVFILTER_DEFINE_CLASS_EXT(asuperpass_asuperstop, "asuperpass/asuperstop",
389  asuperpass_asuperstop_options);
390 
391 const AVFilter ff_af_asuperpass = {
392  .name = "asuperpass",
393  .description = NULL_IF_CONFIG_SMALL("Apply high order Butterworth band-pass filter."),
394  .priv_class = &asuperpass_asuperstop_class,
395  .priv_size = sizeof(ASuperCutContext),
396  .uninit = uninit,
397  FILTER_INPUTS(inputs),
398  FILTER_OUTPUTS(outputs),
399  FILTER_SAMPLEFMTS_ARRAY(sample_fmts),
400  .process_command = process_command,
401  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
402  AVFILTER_FLAG_SLICE_THREADS,
403 };
404 
405 const AVFilter ff_af_asuperstop = {
406  .name = "asuperstop",
407  .description = NULL_IF_CONFIG_SMALL("Apply high order Butterworth band-stop filter."),
408  .priv_class = &asuperpass_asuperstop_class,
409  .priv_size = sizeof(ASuperCutContext),
410  .uninit = uninit,
411  FILTER_INPUTS(inputs),
412  FILTER_OUTPUTS(outputs),
413  FILTER_SAMPLEFMTS_ARRAY(sample_fmts),
414  .process_command = process_command,
415  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
416  AVFILTER_FLAG_SLICE_THREADS,
417 };
ff_af_asuperpass
const AVFilter ff_af_asuperpass
Definition: af_asupercut.c:391
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:100
asupercut_options
static const AVOption asupercut_options[]
Definition: af_asupercut.c:318
AV_SAMPLE_FMT_FLTP
@ AV_SAMPLE_FMT_FLTP
float, planar
Definition: samplefmt.h:66
td
#define td
Definition: regdef.h:70
FLAGS
#define FLAGS
Definition: af_asupercut.c:316
config_input
static int config_input(AVFilterLink *inlink)
Definition: af_asupercut.c:248
level
uint8_t level
Definition: svq3.c:206
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
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:999
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
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
AVOption
AVOption.
Definition: opt.h:251
b
#define b
Definition: input.c:34
calc_q_factors
static void calc_q_factors(int n, double *q)
Definition: af_asupercut.c:56
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:175
ThreadData::out
AVFrame * out
Definition: af_adeclick.c:473
ThreadData::in
AVFrame * in
Definition: af_adecorrelate.c:154
D
D(D(float, sse)
Definition: rematrix_init.c:29
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:49
ASuperCutContext::order
int order
Definition: af_asupercut.c:40
ff_af_asupercut
const AVFilter ff_af_asupercut
Definition: af_asupercut.c:343
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:205
get_coeffs
static int get_coeffs(AVFilterContext *ctx)
Definition: af_asupercut.c:62
ASuperCutContext::coeffs
BiquadCoeffs coeffs[10]
Definition: af_asupercut.c:45
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:49
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(asupercut)
av_cold
#define av_cold
Definition: attributes.h:90
s
#define s(width, name)
Definition: cbs_vp9.c:256
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:315
ASuperCutContext::qfactor
double qfactor
Definition: af_asupercut.c:39
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:190
arg
const char * arg
Definition: jacosubdec.c:67
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
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:596
ff_af_asuperstop
const AVFilter ff_af_asuperstop
Definition: af_asupercut.c:405
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:56
ff_af_asubcut
const AVFilter ff_af_asubcut
Definition: af_asupercut.c:366
FILTER_SAMPLEFMTS_ARRAY
#define FILTER_SAMPLEFMTS_ARRAY(array)
Definition: internal.h:173
asubcut_options
static const AVOption asubcut_options[]
Definition: af_asupercut.c:357
av_frame_is_writable
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Definition: frame.c:523
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:863
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_asupercut.c:308
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:152
AVFrame::nb_samples
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:405
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
inputs
static const AVFilterPad inputs[]
Definition: af_asupercut.c:327
ff_filter_get_nb_threads
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Definition: avfilter.c:783
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:55
ThreadData
Used for passing data between threads.
Definition: dsddec.c:68
AVFILTER_DEFINE_CLASS_EXT
AVFILTER_DEFINE_CLASS_EXT(asuperpass_asuperstop, "asuperpass/asuperstop", asuperpass_asuperstop_options)
asuperpass_asuperstop_options
static const AVOption asuperpass_asuperstop_options[]
Definition: af_asupercut.c:380
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
ASuperCutContext::cutoff
double cutoff
Definition: af_asupercut.c:37
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:55
BiquadCoeffs::b1
double b1
Definition: af_aemphasis.c:27
AVFilter
Filter definition.
Definition: avfilter.h:171
W
@ W
Definition: vf_addroi.c:26
ret
ret
Definition: filter_design.txt:187
sample_fmts
static enum AVSampleFormat sample_fmts[]
Definition: af_asupercut.c:52
B
#define B
Definition: huffyuvdsp.h:32
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:296
AV_SAMPLE_FMT_DBLP
@ AV_SAMPLE_FMT_DBLP
double, planar
Definition: samplefmt.h:67
ffmath.h
AVFilterContext
An instance of a filter.
Definition: avfilter.h:408
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:127
audio.h
alpha
static const int16_t alpha[]
Definition: ilbcdata.h:55
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:191
ASuperCutContext::level
double level
Definition: af_asupercut.c:38
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: af_asupercut.c:265
d
d
Definition: ffmpeg_filter.c:153
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
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:142
int
int
Definition: ffmpeg_filter.c:153
ASuperCutContext::w
AVFrame * w
Definition: af_asupercut.c:47
outputs
static const AVFilterPad outputs[]
Definition: af_asupercut.c:336
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