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 
28 typedef struct BiquadCoeffs {
29  double a1, a2;
30  double b0, b1, b2;
31 } BiquadCoeffs;
32 
33 typedef struct ASuperCutContext {
34  const AVClass *class;
35 
36  double cutoff;
37  double level;
38  double qfactor;
39  int order;
40 
42  int bypass;
43 
45 
47 
48  int (*filter_channels)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
50 
51 static const enum AVSampleFormat sample_fmts[] = {
53 };
54 
55 static void calc_q_factors(int n, double *q)
56 {
57  for (int i = 0; i < n / 2; i++)
58  q[i] = 1. / (-2. * cos(M_PI * (2. * (i + 1) + n - 1.) / (2. * n)));
59 }
60 
62 {
63  ASuperCutContext *s = ctx->priv;
64  AVFilterLink *inlink = ctx->inputs[0];
65  double w0 = s->cutoff / inlink->sample_rate;
66  double K = tan(M_PI * w0);
67  double q[10];
68 
69  s->bypass = w0 >= 0.5;
70  if (s->bypass)
71  return 0;
72 
73  if (!strcmp(ctx->filter->name, "asubcut")) {
74  s->filter_count = s->order / 2 + (s->order & 1);
75 
76  calc_q_factors(s->order, q);
77 
78  if (s->order & 1) {
79  BiquadCoeffs *coeffs = &s->coeffs[0];
80  double omega = 2. * tan(M_PI * w0);
81 
82  coeffs->b0 = 2. / (2. + omega);
83  coeffs->b1 = -coeffs->b0;
84  coeffs->b2 = 0.;
85  coeffs->a1 = -(omega - 2.) / (2. + omega);
86  coeffs->a2 = 0.;
87  }
88 
89  for (int b = (s->order & 1); b < s->filter_count; b++) {
90  BiquadCoeffs *coeffs = &s->coeffs[b];
91  const int idx = b - (s->order & 1);
92  double norm = 1.0 / (1.0 + K / q[idx] + K * K);
93 
94  coeffs->b0 = norm;
95  coeffs->b1 = -2.0 * coeffs->b0;
96  coeffs->b2 = coeffs->b0;
97  coeffs->a1 = -2.0 * (K * K - 1.0) * norm;
98  coeffs->a2 = -(1.0 - K / q[idx] + K * K) * norm;
99  }
100  } else if (!strcmp(ctx->filter->name, "asupercut")) {
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 = omega / (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 = K * K * 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, "asuperpass")) {
128  double alpha, beta, gamma, theta;
129  double theta_0 = 2. * M_PI * (s->cutoff / inlink->sample_rate);
130  double d_E;
131 
132  s->filter_count = s->order / 2;
133  d_E = (2. * tan(theta_0 / (2. * s->qfactor))) / sin(theta_0);
134 
135  for (int b = 0; b < s->filter_count; b += 2) {
136  double D = 2. * sin(((b + 1) * M_PI) / (2. * s->filter_count));
137  double A = (1. + pow((d_E / 2.), 2)) / (D * d_E / 2.);
138  double d = sqrt((d_E * D) / (A + sqrt(A * A - 1.)));
139  double B = D * (d_E / 2.) / d;
140  double W = B + sqrt(B * B - 1.);
141 
142  for (int j = 0; j < 2; j++) {
143  BiquadCoeffs *coeffs = &s->coeffs[b + j];
144 
145  if (j == 1)
146  theta = 2. * atan(tan(theta_0 / 2.) / W);
147  else
148  theta = 2. * atan(W * tan(theta_0 / 2.));
149 
150  beta = 0.5 * ((1. - (d / 2.) * sin(theta)) / (1. + (d / 2.) * sin(theta)));
151  gamma = (0.5 + beta) * cos(theta);
152  alpha = 0.5 * (0.5 - beta) * sqrt(1. + pow((W - (1. / W)) / d, 2.));
153 
154  coeffs->a1 = 2. * gamma;
155  coeffs->a2 = -2. * beta;
156  coeffs->b0 = 2. * alpha;
157  coeffs->b1 = 0.;
158  coeffs->b2 = -2. * alpha;
159  }
160  }
161  } else if (!strcmp(ctx->filter->name, "asuperstop")) {
162  double alpha, beta, gamma, theta;
163  double theta_0 = 2. * M_PI * (s->cutoff / inlink->sample_rate);
164  double d_E;
165 
166  s->filter_count = s->order / 2;
167  d_E = (2. * tan(theta_0 / (2. * s->qfactor))) / sin(theta_0);
168 
169  for (int b = 0; b < s->filter_count; b += 2) {
170  double D = 2. * sin(((b + 1) * M_PI) / (2. * s->filter_count));
171  double A = (1. + pow((d_E / 2.), 2)) / (D * d_E / 2.);
172  double d = sqrt((d_E * D) / (A + sqrt(A * A - 1.)));
173  double B = D * (d_E / 2.) / d;
174  double W = B + sqrt(B * B - 1.);
175 
176  for (int j = 0; j < 2; j++) {
177  BiquadCoeffs *coeffs = &s->coeffs[b + j];
178 
179  if (j == 1)
180  theta = 2. * atan(tan(theta_0 / 2.) / W);
181  else
182  theta = 2. * atan(W * tan(theta_0 / 2.));
183 
184  beta = 0.5 * ((1. - (d / 2.) * sin(theta)) / (1. + (d / 2.) * sin(theta)));
185  gamma = (0.5 + beta) * cos(theta);
186  alpha = 0.5 * (0.5 + beta) * ((1. - cos(theta)) / (1. - cos(theta_0)));
187 
188  coeffs->a1 = 2. * gamma;
189  coeffs->a2 = -2. * beta;
190  coeffs->b0 = 2. * alpha;
191  coeffs->b1 = -4. * alpha * cos(theta_0);
192  coeffs->b2 = 2. * alpha;
193  }
194  }
195  }
196 
197  return 0;
198 }
199 
200 typedef struct ThreadData {
201  AVFrame *in, *out;
202 } ThreadData;
203 
204 #define FILTER(name, type) \
205 static int filter_channels_## name(AVFilterContext *ctx, void *arg, \
206  int jobnr, int nb_jobs) \
207 { \
208  ASuperCutContext *s = ctx->priv; \
209  ThreadData *td = arg; \
210  AVFrame *out = td->out; \
211  AVFrame *in = td->in; \
212  const int start = (in->ch_layout.nb_channels * jobnr) / nb_jobs; \
213  const int end = (in->ch_layout.nb_channels * (jobnr+1)) / nb_jobs; \
214  const double level = s->level; \
215  \
216  for (int ch = start; ch < end; ch++) { \
217  const type *src = (const type *)in->extended_data[ch]; \
218  type *dst = (type *)out->extended_data[ch]; \
219  \
220  for (int b = 0; b < s->filter_count; b++) { \
221  BiquadCoeffs *coeffs = &s->coeffs[b]; \
222  const type a1 = coeffs->a1; \
223  const type a2 = coeffs->a2; \
224  const type b0 = coeffs->b0; \
225  const type b1 = coeffs->b1; \
226  const type b2 = coeffs->b2; \
227  type *w = ((type *)s->w->extended_data[ch]) + b * 2; \
228  \
229  for (int n = 0; n < in->nb_samples; n++) { \
230  type sin = b ? dst[n] : src[n] * level; \
231  type sout = sin * b0 + w[0]; \
232  \
233  w[0] = b1 * sin + w[1] + a1 * sout; \
234  w[1] = b2 * sin + a2 * sout; \
235  \
236  dst[n] = sout; \
237  } \
238  } \
239  } \
240  \
241  return 0; \
242 }
243 
244 FILTER(fltp, float)
245 FILTER(dblp, double)
246 
248 {
249  AVFilterContext *ctx = inlink->dst;
250  ASuperCutContext *s = ctx->priv;
251 
252  switch (inlink->format) {
253  case AV_SAMPLE_FMT_FLTP: s->filter_channels = filter_channels_fltp; break;
254  case AV_SAMPLE_FMT_DBLP: s->filter_channels = filter_channels_dblp; break;
255  }
256 
257  s->w = ff_get_audio_buffer(inlink, 2 * 10);
258  if (!s->w)
259  return AVERROR(ENOMEM);
260 
261  return get_coeffs(ctx);
262 }
263 
265 {
266  AVFilterContext *ctx = inlink->dst;
267  ASuperCutContext *s = ctx->priv;
268  AVFilterLink *outlink = ctx->outputs[0];
269  ThreadData td;
270  AVFrame *out;
271 
272  if (s->bypass)
273  return ff_filter_frame(outlink, in);
274 
275  if (av_frame_is_writable(in)) {
276  out = in;
277  } else {
278  out = ff_get_audio_buffer(outlink, in->nb_samples);
279  if (!out) {
280  av_frame_free(&in);
281  return AVERROR(ENOMEM);
282  }
284  }
285 
286  td.in = in; td.out = out;
287  ff_filter_execute(ctx, s->filter_channels, &td, NULL,
288  FFMIN(inlink->ch_layout.nb_channels, ff_filter_get_nb_threads(ctx)));
289 
290  if (out != in)
291  av_frame_free(&in);
292  return ff_filter_frame(outlink, out);
293 }
294 
295 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
296  char *res, int res_len, int flags)
297 {
298  int ret;
299 
300  ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
301  if (ret < 0)
302  return ret;
303 
304  return get_coeffs(ctx);
305 }
306 
308 {
309  ASuperCutContext *s = ctx->priv;
310 
311  av_frame_free(&s->w);
312 }
313 
314 #define OFFSET(x) offsetof(ASuperCutContext, x)
315 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
316 
317 static const AVOption asupercut_options[] = {
318  { "cutoff", "set cutoff frequency", OFFSET(cutoff), AV_OPT_TYPE_DOUBLE, {.dbl=20000}, 20000, 192000, FLAGS },
319  { "order", "set filter order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=10}, 3, 20, FLAGS },
320  { "level", "set input level", OFFSET(level), AV_OPT_TYPE_DOUBLE, {.dbl=1.}, 0., 1., FLAGS },
321  { NULL }
322 };
323 
324 AVFILTER_DEFINE_CLASS(asupercut);
325 
326 static const AVFilterPad inputs[] = {
327  {
328  .name = "default",
329  .type = AVMEDIA_TYPE_AUDIO,
330  .filter_frame = filter_frame,
331  .config_props = config_input,
332  },
333 };
334 
336  .name = "asupercut",
337  .description = NULL_IF_CONFIG_SMALL("Cut super frequencies."),
338  .priv_size = sizeof(ASuperCutContext),
339  .priv_class = &asupercut_class,
340  .uninit = uninit,
344  .process_command = process_command,
347 };
348 
349 static const AVOption asubcut_options[] = {
350  { "cutoff", "set cutoff frequency", OFFSET(cutoff), AV_OPT_TYPE_DOUBLE, {.dbl=20}, 2, 200, FLAGS },
351  { "order", "set filter order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=10}, 3, 20, FLAGS },
352  { "level", "set input level", OFFSET(level), AV_OPT_TYPE_DOUBLE, {.dbl=1.}, 0., 1., FLAGS },
353  { NULL }
354 };
355 
356 AVFILTER_DEFINE_CLASS(asubcut);
357 
359  .name = "asubcut",
360  .description = NULL_IF_CONFIG_SMALL("Cut subwoofer frequencies."),
361  .priv_size = sizeof(ASuperCutContext),
362  .priv_class = &asubcut_class,
363  .uninit = uninit,
367  .process_command = process_command,
370 };
371 
373  { "centerf","set center frequency", OFFSET(cutoff), AV_OPT_TYPE_DOUBLE, {.dbl=1000}, 2, 999999, FLAGS },
374  { "order", "set filter order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=4}, 4, 20, FLAGS },
375  { "qfactor","set Q-factor", OFFSET(qfactor),AV_OPT_TYPE_DOUBLE, {.dbl=1.},0.01, 100., FLAGS },
376  { "level", "set input level", OFFSET(level), AV_OPT_TYPE_DOUBLE, {.dbl=1.}, 0., 2., FLAGS },
377  { NULL }
378 };
379 
380 AVFILTER_DEFINE_CLASS_EXT(asuperpass_asuperstop, "asuperpass/asuperstop",
382 
384  .name = "asuperpass",
385  .description = NULL_IF_CONFIG_SMALL("Apply high order Butterworth band-pass filter."),
386  .priv_class = &asuperpass_asuperstop_class,
387  .priv_size = sizeof(ASuperCutContext),
388  .uninit = uninit,
392  .process_command = process_command,
395 };
396 
398  .name = "asuperstop",
399  .description = NULL_IF_CONFIG_SMALL("Apply high order Butterworth band-stop filter."),
400  .priv_class = &asuperpass_asuperstop_class,
401  .priv_size = sizeof(ASuperCutContext),
402  .uninit = uninit,
406  .process_command = process_command,
409 };
ff_af_asuperpass
const AVFilter ff_af_asuperpass
Definition: af_asupercut.c:383
A
#define A(x)
Definition: vpx_arith.h:28
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
asupercut_options
static const AVOption asupercut_options[]
Definition: af_asupercut.c:317
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:315
config_input
static int config_input(AVFilterLink *inlink)
Definition: af_asupercut.c:247
level
uint8_t level
Definition: svq3.c:205
ASuperCutContext
Definition: af_asupercut.c:33
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: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
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
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
AVOption
AVOption.
Definition: opt.h:357
b
#define b
Definition: input.c:41
calc_q_factors
static void calc_q_factors(int n, double *q)
Definition: af_asupercut.c:55
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
ThreadData::out
AVFrame * out
Definition: af_adeclick.c:527
ThreadData::in
AVFrame * in
Definition: af_adecorrelate.c:154
W
@ W
Definition: vf_addroi.c:27
D
D(D(float, sse)
Definition: rematrix_init.c:30
BiquadCoeffs::a1
double a1
Definition: af_aemphasis.c:27
BiquadCoeffs
Definition: af_acrossover.c:49
ASuperCutContext::order
int order
Definition: af_asupercut.c:39
ff_af_asupercut
const AVFilter ff_af_asupercut
Definition: af_asupercut.c:335
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:204
get_coeffs
static int get_coeffs(AVFilterContext *ctx)
Definition: af_asupercut.c:61
ASuperCutContext::coeffs
BiquadCoeffs coeffs[10]
Definition: af_asupercut.c:44
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:33
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:198
AV_OPT_TYPE_DOUBLE
@ AV_OPT_TYPE_DOUBLE
Definition: opt.h:247
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
B
#define B
Definition: huffyuv.h:42
ctx
AVFormatContext * ctx
Definition: movenc.c:49
OFFSET
#define OFFSET(x)
Definition: af_asupercut.c:314
ASuperCutContext::qfactor
double qfactor
Definition: af_asupercut.c:38
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:182
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:709
ff_af_asuperstop
const AVFilter ff_af_asuperstop
Definition: af_asupercut.c:397
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
BiquadCoeffs::b0
double b0
Definition: af_asupercut.c:30
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
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:56
ff_af_asubcut
const AVFilter ff_af_asubcut
Definition: af_asupercut.c:358
FILTER_SAMPLEFMTS_ARRAY
#define FILTER_SAMPLEFMTS_ARRAY(array)
Definition: internal.h:165
asubcut_options
static const AVOption asubcut_options[]
Definition: af_asupercut.c:349
av_frame_is_writable
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Definition: frame.c:645
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
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_asupercut.c:307
ASuperCutContext::filter_channels
int(* filter_channels)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: af_asupercut.c:48
M_PI
#define M_PI
Definition: mathematics.h:67
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:147
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
inputs
static const AVFilterPad inputs[]
Definition: af_asupercut.c:326
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
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:55
ThreadData
Used for passing data between threads.
Definition: dsddec.c:71
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:372
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
ASuperCutContext::cutoff
double cutoff
Definition: af_asupercut.c:36
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:39
BiquadCoeffs::b1
double b1
Definition: af_aemphasis.c:27
AVFilter
Filter definition.
Definition: avfilter.h:166
ret
ret
Definition: filter_design.txt:187
sample_fmts
static enum AVSampleFormat sample_fmts[]
Definition: af_asupercut.c:51
channel_layout.h
ASuperCutContext::filter_count
int filter_count
Definition: af_asupercut.c:41
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:245
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:295
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:407
ASuperCutContext::bypass
int bypass
Definition: af_asupercut.c:42
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
alpha
static const int16_t alpha[]
Definition: ilbcdata.h:55
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:183
ASuperCutContext::level
double level
Definition: af_asupercut.c:37
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: af_asupercut.c:264
K
#define K
Definition: palette.c:25
d
d
Definition: ffmpeg_filter.c:424
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
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
int
int
Definition: ffmpeg_filter.c:424
ASuperCutContext::w
AVFrame * w
Definition: af_asupercut.c:46