FFmpeg
af_stereotools.c
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1 /*
2  * Copyright (C) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen
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 "libavutil/channel_layout.h"
22 #include "libavutil/opt.h"
23 #include "avfilter.h"
24 #include "audio.h"
25 #include "formats.h"
26 
27 typedef struct StereoToolsContext {
28  const AVClass *class;
29 
30  int softclip;
31  int mute_l;
32  int mute_r;
33  int phase_l;
34  int phase_r;
35  int mode;
36  int bmode_in;
37  int bmode_out;
38  double slev;
39  double sbal;
40  double mlev;
41  double mpan;
42  double phase;
43  double base;
44  double delay;
45  double balance_in;
46  double balance_out;
47  double phase_sin_coef;
48  double phase_cos_coef;
49  double sc_level;
50  double inv_atan_shape;
51  double level_in;
52  double level_out;
53 
54  double *buffer;
55  int length;
56  int pos;
57 } StereoToolsContext;
58 
59 #define OFFSET(x) offsetof(StereoToolsContext, x)
60 #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
61 
62 static const AVOption stereotools_options[] = {
63  { "level_in", "set level in", OFFSET(level_in), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A },
64  { "level_out", "set level out", OFFSET(level_out), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A },
65  { "balance_in", "set balance in", OFFSET(balance_in), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
66  { "balance_out", "set balance out", OFFSET(balance_out), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
67  { "softclip", "enable softclip", OFFSET(softclip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
68  { "mutel", "mute L", OFFSET(mute_l), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
69  { "muter", "mute R", OFFSET(mute_r), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
70  { "phasel", "phase L", OFFSET(phase_l), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
71  { "phaser", "phase R", OFFSET(phase_r), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
72  { "mode", "set stereo mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 10, A, "mode" },
73  { "lr>lr", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A, "mode" },
74  { "lr>ms", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A, "mode" },
75  { "ms>lr", 0, 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, A, "mode" },
76  { "lr>ll", 0, 0, AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, A, "mode" },
77  { "lr>rr", 0, 0, AV_OPT_TYPE_CONST, {.i64=4}, 0, 0, A, "mode" },
78  { "lr>l+r", 0, 0, AV_OPT_TYPE_CONST, {.i64=5}, 0, 0, A, "mode" },
79  { "lr>rl", 0, 0, AV_OPT_TYPE_CONST, {.i64=6}, 0, 0, A, "mode" },
80  { "ms>ll", 0, 0, AV_OPT_TYPE_CONST, {.i64=7}, 0, 0, A, "mode" },
81  { "ms>rr", 0, 0, AV_OPT_TYPE_CONST, {.i64=8}, 0, 0, A, "mode" },
82  { "ms>rl", 0, 0, AV_OPT_TYPE_CONST, {.i64=9}, 0, 0, A, "mode" },
83  { "lr>l-r", 0, 0, AV_OPT_TYPE_CONST, {.i64=10}, 0, 0, A, "mode" },
84  { "slev", "set side level", OFFSET(slev), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A },
85  { "sbal", "set side balance", OFFSET(sbal), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
86  { "mlev", "set middle level", OFFSET(mlev), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A },
87  { "mpan", "set middle pan", OFFSET(mpan), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
88  { "base", "set stereo base", OFFSET(base), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
89  { "delay", "set delay", OFFSET(delay), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -20, 20, A },
90  { "sclevel", "set S/C level", OFFSET(sc_level), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 1, 100, A },
91  { "phase", "set stereo phase", OFFSET(phase), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 360, A },
92  { "bmode_in", "set balance in mode", OFFSET(bmode_in), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, A, "bmode" },
93  { "balance", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A, "bmode" },
94  { "amplitude", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A, "bmode" },
95  { "power", 0, 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, A, "bmode" },
96  { "bmode_out", "set balance out mode", OFFSET(bmode_out), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, A, "bmode" },
97  { NULL }
98 };
99 
100 AVFILTER_DEFINE_CLASS(stereotools);
101 
102 static int query_formats(AVFilterContext *ctx)
103 {
104  AVFilterFormats *formats = NULL;
105  AVFilterChannelLayouts *layout = NULL;
106  int ret;
107 
108  if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_DBL )) < 0 ||
109  (ret = ff_set_common_formats (ctx , formats )) < 0 ||
110  (ret = ff_add_channel_layout (&layout , &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO)) < 0 ||
111  (ret = ff_set_common_channel_layouts (ctx , layout )) < 0)
112  return ret;
113 
114  return ff_set_common_all_samplerates(ctx);
115 }
116 
117 static int config_input(AVFilterLink *inlink)
118 {
119  AVFilterContext *ctx = inlink->dst;
120  StereoToolsContext *s = ctx->priv;
121 
122  s->length = FFALIGN(inlink->sample_rate / 10, 2);
123  if (!s->buffer)
124  s->buffer = av_calloc(s->length, sizeof(*s->buffer));
125  if (!s->buffer)
126  return AVERROR(ENOMEM);
127 
128  s->inv_atan_shape = 1.0 / atan(s->sc_level);
129  s->phase_cos_coef = cos(s->phase / 180 * M_PI);
130  s->phase_sin_coef = sin(s->phase / 180 * M_PI);
131 
132  return 0;
133 }
134 
135 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
136 {
137  AVFilterContext *ctx = inlink->dst;
138  AVFilterLink *outlink = ctx->outputs[0];
139  StereoToolsContext *s = ctx->priv;
140  const double *src = (const double *)in->data[0];
141  const double sb = s->base < 0 ? s->base * 0.5 : s->base;
142  const double sbal = 1 + s->sbal;
143  const double mpan = 1 + s->mpan;
144  const double slev = s->slev;
145  const double mlev = s->mlev;
146  const double balance_in = s->balance_in;
147  const double balance_out = s->balance_out;
148  const double level_in = s->level_in;
149  const double level_out = s->level_out;
150  const double sc_level = s->sc_level;
151  const double delay = s->delay;
152  const int length = s->length;
153  const int mute_l = s->mute_l;
154  const int mute_r = s->mute_r;
155  const int phase_l = s->phase_l;
156  const int phase_r = s->phase_r;
157  double *buffer = s->buffer;
158  AVFrame *out;
159  double *dst;
160  int nbuf = inlink->sample_rate * (fabs(delay) / 1000.);
161  int n;
162 
163  nbuf -= nbuf % 2;
164  if (av_frame_is_writable(in)) {
165  out = in;
166  } else {
167  out = ff_get_audio_buffer(outlink, in->nb_samples);
168  if (!out) {
169  av_frame_free(&in);
170  return AVERROR(ENOMEM);
171  }
172  av_frame_copy_props(out, in);
173  }
174  dst = (double *)out->data[0];
175 
176  for (n = 0; n < in->nb_samples; n++, src += 2, dst += 2) {
177  double L = src[0], R = src[1], l, r, m, S, gl, gr, gd;
178 
179  L *= level_in;
180  R *= level_in;
181 
182  gl = 1. - FFMAX(0., balance_in);
183  gr = 1. + FFMIN(0., balance_in);
184  switch (s->bmode_in) {
185  case 1:
186  gd = gl - gr;
187  gl = 1. + gd;
188  gr = 1. - gd;
189  break;
190  case 2:
191  if (balance_in < 0.) {
192  gr = FFMAX(0.5, gr);
193  gl = 1. / gr;
194  } else if (balance_in > 0.) {
195  gl = FFMAX(0.5, gl);
196  gr = 1. / gl;
197  }
198  break;
199  }
200  L *= gl;
201  R *= gr;
202 
203  if (s->softclip) {
204  R = s->inv_atan_shape * atan(R * sc_level);
205  L = s->inv_atan_shape * atan(L * sc_level);
206  }
207 
208  switch (s->mode) {
209  case 0:
210  m = (L + R) * 0.5;
211  S = (L - R) * 0.5;
212  l = m * mlev * FFMIN(1., 2. - mpan) + S * slev * FFMIN(1., 2. - sbal);
213  r = m * mlev * FFMIN(1., mpan) - S * slev * FFMIN(1., sbal);
214  L = l;
215  R = r;
216  break;
217  case 1:
218  l = L * FFMIN(1., 2. - sbal);
219  r = R * FFMIN(1., sbal);
220  L = 0.5 * (l + r) * mlev;
221  R = 0.5 * (l - r) * slev;
222  break;
223  case 2:
224  l = L * mlev * FFMIN(1., 2. - mpan) + R * slev * FFMIN(1., 2. - sbal);
225  r = L * mlev * FFMIN(1., mpan) - R * slev * FFMIN(1., sbal);
226  L = l;
227  R = r;
228  break;
229  case 3:
230  R = L;
231  break;
232  case 4:
233  L = R;
234  break;
235  case 5:
236  L = (L + R) * 0.5;
237  R = L;
238  break;
239  case 6:
240  l = L;
241  L = R;
242  R = l;
243  m = (L + R) * 0.5;
244  S = (L - R) * 0.5;
245  l = m * mlev * FFMIN(1., 2. - mpan) + S * slev * FFMIN(1., 2. - sbal);
246  r = m * mlev * FFMIN(1., mpan) - S * slev * FFMIN(1., sbal);
247  L = l;
248  R = r;
249  break;
250  case 7:
251  l = L * mlev * FFMIN(1., 2. - mpan) + R * slev * FFMIN(1., 2. - sbal);
252  L = l;
253  R = l;
254  break;
255  case 8:
256  r = L * mlev * FFMIN(1., mpan) - R * slev * FFMIN(1., sbal);
257  L = r;
258  R = r;
259  break;
260  case 9:
261  l = L * mlev * FFMIN(1., 2. - mpan) + R * slev * FFMIN(1., 2. - sbal);
262  r = L * mlev * FFMIN(1., mpan) - R * slev * FFMIN(1., sbal);
263  L = r;
264  R = l;
265  break;
266  case 10:
267  L = (L - R) * 0.5;
268  R = L;
269  break;
270  }
271 
272  L *= 1. - mute_l;
273  R *= 1. - mute_r;
274 
275  L *= (2. * (1. - phase_l)) - 1.;
276  R *= (2. * (1. - phase_r)) - 1.;
277 
278  buffer[s->pos ] = L;
279  buffer[s->pos+1] = R;
280 
281  if (delay > 0.) {
282  R = buffer[(s->pos - (int)nbuf + 1 + length) % length];
283  } else if (delay < 0.) {
284  L = buffer[(s->pos - (int)nbuf + length) % length];
285  }
286 
287  l = L + sb * L - sb * R;
288  r = R + sb * R - sb * L;
289 
290  L = l;
291  R = r;
292 
293  l = L * s->phase_cos_coef - R * s->phase_sin_coef;
294  r = L * s->phase_sin_coef + R * s->phase_cos_coef;
295 
296  L = l;
297  R = r;
298 
299  s->pos = (s->pos + 2) % s->length;
300 
301  gl = 1. - FFMAX(0., balance_out);
302  gr = 1. + FFMIN(0., balance_out);
303  switch (s->bmode_out) {
304  case 1:
305  gd = gl - gr;
306  gl = 1. + gd;
307  gr = 1. - gd;
308  break;
309  case 2:
310  if (balance_out < 0.) {
311  gr = FFMAX(0.5, gr);
312  gl = 1. / gr;
313  } else if (balance_out > 0.) {
314  gl = FFMAX(0.5, gl);
315  gr = 1. / gl;
316  }
317  break;
318  }
319  L *= gl;
320  R *= gr;
321 
322 
323  L *= level_out;
324  R *= level_out;
325 
326  if (ctx->is_disabled) {
327  dst[0] = src[0];
328  dst[1] = src[1];
329  } else {
330  dst[0] = L;
331  dst[1] = R;
332  }
333  }
334 
335  if (out != in)
336  av_frame_free(&in);
337  return ff_filter_frame(outlink, out);
338 }
339 
340 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
341  char *res, int res_len, int flags)
342 {
343  int ret;
344 
345  ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
346  if (ret < 0)
347  return ret;
348 
349  return config_input(ctx->inputs[0]);
350 }
351 
352 static av_cold void uninit(AVFilterContext *ctx)
353 {
354  StereoToolsContext *s = ctx->priv;
355 
356  av_freep(&s->buffer);
357 }
358 
359 static const AVFilterPad inputs[] = {
360  {
361  .name = "default",
362  .type = AVMEDIA_TYPE_AUDIO,
363  .filter_frame = filter_frame,
364  .config_props = config_input,
365  },
366 };
367 
368 static const AVFilterPad outputs[] = {
369  {
370  .name = "default",
371  .type = AVMEDIA_TYPE_AUDIO,
372  },
373 };
374 
375 const AVFilter ff_af_stereotools = {
376  .name = "stereotools",
377  .description = NULL_IF_CONFIG_SMALL("Apply various stereo tools."),
378  .priv_size = sizeof(StereoToolsContext),
379  .priv_class = &stereotools_class,
380  .uninit = uninit,
381  FILTER_INPUTS(inputs),
382  FILTER_OUTPUTS(outputs),
383  FILTER_QUERY_FUNC(query_formats),
384  .process_command = process_command,
385  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
386 };
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:100
AVFilterChannelLayouts
A list of supported channel layouts.
Definition: formats.h:85
StereoToolsContext::mlev
double mlev
Definition: af_stereotools.c:40
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: af_stereotools.c:102
r
const char * r
Definition: vf_curves.c:116
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
A
#define A
Definition: af_stereotools.c:60
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
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static const AVFilterPad inputs[]
Definition: af_stereotools.c:359
StereoToolsContext::delay
double delay
Definition: af_stereotools.c:44
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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
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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
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#define R
Definition: huffyuvdsp.h:34
StereoToolsContext::buffer
double * buffer
Definition: af_stereotools.c:54
StereoToolsContext::inv_atan_shape
double inv_atan_shape
Definition: af_stereotools.c:50
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Definition: opt.h:251
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int mute_l
Definition: af_stereotools.c:31
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#define FILTER_QUERY_FUNC(func)
Definition: internal.h:167
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int ff_set_common_all_samplerates(AVFilterContext *ctx)
Equivalent to ff_set_common_samplerates(ctx, ff_all_samplerates())
Definition: formats.c:739
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Definition: vp3data.h:141
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#define AV_CHANNEL_LAYOUT_STEREO
Definition: channel_layout.h:354
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Definition: af_stereotools.c:39
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Definition: macros.h:47
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const char * name
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Definition: avfilter.h:175
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Definition: af_stereotools.c:352
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uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:346
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A list of supported formats for one end of a filter link.
Definition: formats.h:64
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Definition: flacdsp_template.c:46
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Definition: af_stereotools.c:41
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Definition: af_stereotools.c:368
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Definition: af_stereotools.c:117
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static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
Definition: af_stereotools.c:340
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Definition: internal.h:49
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const AVFilter ff_af_stereotools
Definition: af_stereotools.c:375
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#define av_cold
Definition: attributes.h:90
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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:749
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int softclip
Definition: af_stereotools.c:30
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Definition: cbs_vp9.c:256
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@ AV_OPT_TYPE_DOUBLE
Definition: opt.h:227
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Definition: avutil.h:202
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Definition: af_stereotools.c:33
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Definition: af_stereotools.c:43
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Definition: movenc.c:48
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Definition: af_stereotools.c:48
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Definition: internal.h:190
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Definition: af_stereotools.c:46
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Definition: af_stereotools.c:56
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Describe the class of an AVClass context structure.
Definition: log.h:66
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Definition: coverity.c:32
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Definition: frame.c:596
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Add fmt to the list of media formats contained in *avff.
Definition: formats.c:449
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Definition: formats.c:466
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Definition: af_stereotools.c:42
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Definition: af_stereotools.c:37
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Definition: af_stereotools.c:34
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Definition: af_stereotools.c:35
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Definition: af_stereotools.c:59
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#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
AVChannelLayout
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Definition: channel_layout.h:290
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Definition: h264pred_template.c:425
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Definition: af_stereotools.c:52
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Definition: frame.c:523
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int ff_filter_process_command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
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Definition: avfilter.c:863
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Definition: af_stereotools.c:27
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Definition: af_stereotools.c:135
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Definition: mathematics.h:52
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Definition: af_stereotools.c:45
layout
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 layout
Definition: filter_design.txt:18
AVFrame::nb_samples
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:405
stereotools_options
static const AVOption stereotools_options[]
Definition: af_stereotools.c:62
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
StereoToolsContext::phase_sin_coef
double phase_sin_coef
Definition: af_stereotools.c:47
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:55
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Definition: mem.c:272
AVFilter
Filter definition.
Definition: avfilter.h:171
ret
ret
Definition: filter_design.txt:187
L
#define L(x)
Definition: vp56_arith.h:36
channel_layout.h
buffer
the frame and frame reference mechanism is intended to as much as expensive copies of that data while still allowing the filters to produce correct results The data is stored in buffers represented by AVFrame structures Several references can point to the same frame buffer
Definition: filter_design.txt:49
mode
mode
Definition: ebur128.h:83
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
avfilter.h
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(stereotools)
AVFilterContext
An instance of a filter.
Definition: avfilter.h:408
audio.h
StereoToolsContext::length
int length
Definition: af_stereotools.c:55
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:244
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:191
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:160
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
StereoToolsContext::sc_level
double sc_level
Definition: af_stereotools.c:49
AV_SAMPLE_FMT_DBL
@ AV_SAMPLE_FMT_DBL
double
Definition: samplefmt.h:61
StereoToolsContext::slev
double slev
Definition: af_stereotools.c:38
int
int
Definition: ffmpeg_filter.c:153
StereoToolsContext::level_in
double level_in
Definition: af_stereotools.c:51
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:234
StereoToolsContext::mute_r
int mute_r
Definition: af_stereotools.c:32
ff_set_common_channel_layouts
int ff_set_common_channel_layouts(AVFilterContext *ctx, AVFilterChannelLayouts *channel_layouts)
Helpers for query_formats() which set all free audio links to the same list of channel layouts/sample...
Definition: formats.c:708
StereoToolsContext::bmode_in
int bmode_in
Definition: af_stereotools.c:36
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