FFmpeg
af_stereotools.c
Go to the documentation of this file.
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 
22 #include "libavutil/mem.h"
23 #include "libavutil/opt.h"
24 #include "avfilter.h"
25 #include "audio.h"
26 #include "formats.h"
27 
28 typedef struct StereoToolsContext {
29  const AVClass *class;
30 
31  int softclip;
32  int mute_l;
33  int mute_r;
34  int phase_l;
35  int phase_r;
36  int mode;
37  int bmode_in;
38  int bmode_out;
39  double slev;
40  double sbal;
41  double mlev;
42  double mpan;
43  double phase;
44  double base;
45  double delay;
46  double balance_in;
47  double balance_out;
50  double sc_level;
52  double level_in;
53  double level_out;
54 
55  double *buffer;
56  int length;
57  int pos;
59 
60 #define OFFSET(x) offsetof(StereoToolsContext, x)
61 #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
62 
63 static const AVOption stereotools_options[] = {
64  { "level_in", "set level in", OFFSET(level_in), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A },
65  { "level_out", "set level out", OFFSET(level_out), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A },
66  { "balance_in", "set balance in", OFFSET(balance_in), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
67  { "balance_out", "set balance out", OFFSET(balance_out), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
68  { "softclip", "enable softclip", OFFSET(softclip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
69  { "mutel", "mute L", OFFSET(mute_l), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
70  { "muter", "mute R", OFFSET(mute_r), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
71  { "phasel", "phase L", OFFSET(phase_l), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
72  { "phaser", "phase R", OFFSET(phase_r), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
73  { "mode", "set stereo mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 10, A, .unit = "mode" },
74  { "lr>lr", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A, .unit = "mode" },
75  { "lr>ms", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A, .unit = "mode" },
76  { "ms>lr", 0, 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, A, .unit = "mode" },
77  { "lr>ll", 0, 0, AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, A, .unit = "mode" },
78  { "lr>rr", 0, 0, AV_OPT_TYPE_CONST, {.i64=4}, 0, 0, A, .unit = "mode" },
79  { "lr>l+r", 0, 0, AV_OPT_TYPE_CONST, {.i64=5}, 0, 0, A, .unit = "mode" },
80  { "lr>rl", 0, 0, AV_OPT_TYPE_CONST, {.i64=6}, 0, 0, A, .unit = "mode" },
81  { "ms>ll", 0, 0, AV_OPT_TYPE_CONST, {.i64=7}, 0, 0, A, .unit = "mode" },
82  { "ms>rr", 0, 0, AV_OPT_TYPE_CONST, {.i64=8}, 0, 0, A, .unit = "mode" },
83  { "ms>rl", 0, 0, AV_OPT_TYPE_CONST, {.i64=9}, 0, 0, A, .unit = "mode" },
84  { "lr>l-r", 0, 0, AV_OPT_TYPE_CONST, {.i64=10}, 0, 0, A, .unit = "mode" },
85  { "slev", "set side level", OFFSET(slev), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A },
86  { "sbal", "set side balance", OFFSET(sbal), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
87  { "mlev", "set middle level", OFFSET(mlev), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A },
88  { "mpan", "set middle pan", OFFSET(mpan), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
89  { "base", "set stereo base", OFFSET(base), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
90  { "delay", "set delay", OFFSET(delay), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -20, 20, A },
91  { "sclevel", "set S/C level", OFFSET(sc_level), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 1, 100, A },
92  { "phase", "set stereo phase", OFFSET(phase), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 360, A },
93  { "bmode_in", "set balance in mode", OFFSET(bmode_in), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, A, .unit = "bmode" },
94  { "balance", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A, .unit = "bmode" },
95  { "amplitude", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A, .unit = "bmode" },
96  { "power", 0, 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, A, .unit = "bmode" },
97  { "bmode_out", "set balance out mode", OFFSET(bmode_out), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, A, .unit = "bmode" },
98  { NULL }
99 };
100 
101 AVFILTER_DEFINE_CLASS(stereotools);
102 
104 {
107  int ret;
108 
109  if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_DBL )) < 0 ||
110  (ret = ff_set_common_formats (ctx , formats )) < 0 ||
113  return ret;
114 
116 }
117 
119 {
120  AVFilterContext *ctx = inlink->dst;
121  StereoToolsContext *s = ctx->priv;
122 
123  s->length = FFALIGN((inlink->sample_rate + 9) / 10, 2);
124  if (!s->buffer)
125  s->buffer = av_calloc(s->length, sizeof(*s->buffer));
126  if (!s->buffer)
127  return AVERROR(ENOMEM);
128 
129  s->inv_atan_shape = 1.0 / atan(s->sc_level);
130  s->phase_cos_coef = cos(s->phase / 180 * M_PI);
131  s->phase_sin_coef = sin(s->phase / 180 * M_PI);
132 
133  return 0;
134 }
135 
137 {
138  AVFilterContext *ctx = inlink->dst;
139  AVFilterLink *outlink = ctx->outputs[0];
140  StereoToolsContext *s = ctx->priv;
141  const double *src = (const double *)in->data[0];
142  const double sb = s->base < 0 ? s->base * 0.5 : s->base;
143  const double sbal = 1 + s->sbal;
144  const double mpan = 1 + s->mpan;
145  const double slev = s->slev;
146  const double mlev = s->mlev;
147  const double balance_in = s->balance_in;
148  const double balance_out = s->balance_out;
149  const double level_in = s->level_in;
150  const double level_out = s->level_out;
151  const double sc_level = s->sc_level;
152  const double delay = s->delay;
153  const int length = s->length;
154  const int mute_l = s->mute_l;
155  const int mute_r = s->mute_r;
156  const int phase_l = s->phase_l;
157  const int phase_r = s->phase_r;
158  double *buffer = s->buffer;
159  AVFrame *out;
160  double *dst;
161  int nbuf = inlink->sample_rate * (fabs(delay) / 1000.);
162  int n;
163 
164  nbuf -= nbuf % 2;
165  if (av_frame_is_writable(in)) {
166  out = in;
167  } else {
168  out = ff_get_audio_buffer(outlink, in->nb_samples);
169  if (!out) {
170  av_frame_free(&in);
171  return AVERROR(ENOMEM);
172  }
174  }
175  dst = (double *)out->data[0];
176 
177  for (n = 0; n < in->nb_samples; n++, src += 2, dst += 2) {
178  double L = src[0], R = src[1], l, r, m, S, gl, gr, gd;
179 
180  L *= level_in;
181  R *= level_in;
182 
183  gl = 1. - FFMAX(0., balance_in);
184  gr = 1. + FFMIN(0., balance_in);
185  switch (s->bmode_in) {
186  case 1:
187  gd = gl - gr;
188  gl = 1. + gd;
189  gr = 1. - gd;
190  break;
191  case 2:
192  if (balance_in < 0.) {
193  gr = FFMAX(0.5, gr);
194  gl = 1. / gr;
195  } else if (balance_in > 0.) {
196  gl = FFMAX(0.5, gl);
197  gr = 1. / gl;
198  }
199  break;
200  }
201  L *= gl;
202  R *= gr;
203 
204  if (s->softclip) {
205  R = s->inv_atan_shape * atan(R * sc_level);
206  L = s->inv_atan_shape * atan(L * sc_level);
207  }
208 
209  switch (s->mode) {
210  case 0:
211  m = (L + R) * 0.5;
212  S = (L - R) * 0.5;
213  l = m * mlev * FFMIN(1., 2. - mpan) + S * slev * FFMIN(1., 2. - sbal);
214  r = m * mlev * FFMIN(1., mpan) - S * slev * FFMIN(1., sbal);
215  L = l;
216  R = r;
217  break;
218  case 1:
219  l = L * FFMIN(1., 2. - sbal);
220  r = R * FFMIN(1., sbal);
221  L = 0.5 * (l + r) * mlev;
222  R = 0.5 * (l - r) * slev;
223  break;
224  case 2:
225  l = L * mlev * FFMIN(1., 2. - mpan) + R * slev * FFMIN(1., 2. - sbal);
226  r = L * mlev * FFMIN(1., mpan) - R * slev * FFMIN(1., sbal);
227  L = l;
228  R = r;
229  break;
230  case 3:
231  R = L;
232  break;
233  case 4:
234  L = R;
235  break;
236  case 5:
237  L = (L + R) * 0.5;
238  R = L;
239  break;
240  case 6:
241  l = L;
242  L = R;
243  R = l;
244  m = (L + R) * 0.5;
245  S = (L - R) * 0.5;
246  l = m * mlev * FFMIN(1., 2. - mpan) + S * slev * FFMIN(1., 2. - sbal);
247  r = m * mlev * FFMIN(1., mpan) - S * slev * FFMIN(1., sbal);
248  L = l;
249  R = r;
250  break;
251  case 7:
252  l = L * mlev * FFMIN(1., 2. - mpan) + R * slev * FFMIN(1., 2. - sbal);
253  L = l;
254  R = l;
255  break;
256  case 8:
257  r = L * mlev * FFMIN(1., mpan) - R * slev * FFMIN(1., sbal);
258  L = r;
259  R = r;
260  break;
261  case 9:
262  l = L * mlev * FFMIN(1., 2. - mpan) + R * slev * FFMIN(1., 2. - sbal);
263  r = L * mlev * FFMIN(1., mpan) - R * slev * FFMIN(1., sbal);
264  L = r;
265  R = l;
266  break;
267  case 10:
268  L = (L - R) * 0.5;
269  R = L;
270  break;
271  }
272 
273  L *= 1. - mute_l;
274  R *= 1. - mute_r;
275 
276  L *= (2. * (1. - phase_l)) - 1.;
277  R *= (2. * (1. - phase_r)) - 1.;
278 
279  buffer[s->pos ] = L;
280  buffer[s->pos+1] = R;
281 
282  if (delay > 0.) {
283  R = buffer[(s->pos - (int)nbuf + 1 + length) % length];
284  } else if (delay < 0.) {
285  L = buffer[(s->pos - (int)nbuf + length) % length];
286  }
287 
288  l = L + sb * L - sb * R;
289  r = R + sb * R - sb * L;
290 
291  L = l;
292  R = r;
293 
294  l = L * s->phase_cos_coef - R * s->phase_sin_coef;
295  r = L * s->phase_sin_coef + R * s->phase_cos_coef;
296 
297  L = l;
298  R = r;
299 
300  s->pos = (s->pos + 2) % s->length;
301 
302  gl = 1. - FFMAX(0., balance_out);
303  gr = 1. + FFMIN(0., balance_out);
304  switch (s->bmode_out) {
305  case 1:
306  gd = gl - gr;
307  gl = 1. + gd;
308  gr = 1. - gd;
309  break;
310  case 2:
311  if (balance_out < 0.) {
312  gr = FFMAX(0.5, gr);
313  gl = 1. / gr;
314  } else if (balance_out > 0.) {
315  gl = FFMAX(0.5, gl);
316  gr = 1. / gl;
317  }
318  break;
319  }
320  L *= gl;
321  R *= gr;
322 
323 
324  L *= level_out;
325  R *= level_out;
326 
327  if (ctx->is_disabled) {
328  dst[0] = src[0];
329  dst[1] = src[1];
330  } else {
331  dst[0] = L;
332  dst[1] = R;
333  }
334  }
335 
336  if (out != in)
337  av_frame_free(&in);
338  return ff_filter_frame(outlink, out);
339 }
340 
341 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
342  char *res, int res_len, int flags)
343 {
344  int ret;
345 
346  ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
347  if (ret < 0)
348  return ret;
349 
350  return config_input(ctx->inputs[0]);
351 }
352 
354 {
355  StereoToolsContext *s = ctx->priv;
356 
357  av_freep(&s->buffer);
358 }
359 
360 static const AVFilterPad inputs[] = {
361  {
362  .name = "default",
363  .type = AVMEDIA_TYPE_AUDIO,
364  .filter_frame = filter_frame,
365  .config_props = config_input,
366  },
367 };
368 
370  .name = "stereotools",
371  .description = NULL_IF_CONFIG_SMALL("Apply various stereo tools."),
372  .priv_size = sizeof(StereoToolsContext),
373  .priv_class = &stereotools_class,
374  .uninit = uninit,
378  .process_command = process_command,
380 };
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:97
AVFilterChannelLayouts
A list of supported channel layouts.
Definition: formats.h:85
StereoToolsContext::mlev
double mlev
Definition: af_stereotools.c:41
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: af_stereotools.c:103
r
const char * r
Definition: vf_curves.c:127
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:61
out
FILE * out
Definition: movenc.c:55
AV_CHANNEL_LAYOUT_STEREO
#define AV_CHANNEL_LAYOUT_STEREO
Definition: channel_layout.h:387
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1015
inputs
static const AVFilterPad inputs[]
Definition: af_stereotools.c:360
StereoToolsContext::delay
double delay
Definition: af_stereotools.c:45
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
StereoToolsContext::buffer
double * buffer
Definition: af_stereotools.c:55
StereoToolsContext::inv_atan_shape
double inv_atan_shape
Definition: af_stereotools.c:51
AVOption
AVOption.
Definition: opt.h:357
StereoToolsContext::mute_l
int mute_l
Definition: af_stereotools.c:32
FILTER_QUERY_FUNC
#define FILTER_QUERY_FUNC(func)
Definition: internal.h:159
R
#define R
Definition: huffyuv.h:44
ff_set_common_all_samplerates
int ff_set_common_all_samplerates(AVFilterContext *ctx)
Equivalent to ff_set_common_samplerates(ctx, ff_all_samplerates())
Definition: formats.c:822
base
uint8_t base
Definition: vp3data.h:128
StereoToolsContext::sbal
double sbal
Definition: af_stereotools.c:40
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_stereotools.c:353
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:395
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:64
formats.h
S
#define S(s, c, i)
Definition: flacdsp_template.c:46
StereoToolsContext::mpan
double mpan
Definition: af_stereotools.c:42
config_input
static int config_input(AVFilterLink *inlink)
Definition: af_stereotools.c:118
process_command
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
Definition: af_stereotools.c:341
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:33
ff_af_stereotools
const AVFilter ff_af_stereotools
Definition: af_stereotools.c:369
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:868
StereoToolsContext::softclip
int softclip
Definition: af_stereotools.c:31
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
StereoToolsContext::phase_l
int phase_l
Definition: af_stereotools.c:34
StereoToolsContext::base
double base
Definition: af_stereotools.c:44
ctx
AVFormatContext * ctx
Definition: movenc.c:49
StereoToolsContext::phase_cos_coef
double phase_cos_coef
Definition: af_stereotools.c:49
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:182
StereoToolsContext::balance_out
double balance_out
Definition: af_stereotools.c:47
StereoToolsContext::pos
int pos
Definition: af_stereotools.c:57
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
fabs
static __device__ float fabs(float a)
Definition: cuda_runtime.h:182
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_add_format
int ff_add_format(AVFilterFormats **avff, int64_t fmt)
Add fmt to the list of media formats contained in *avff.
Definition: formats.c:505
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
ff_add_channel_layout
int ff_add_channel_layout(AVFilterChannelLayouts **l, const AVChannelLayout *channel_layout)
Definition: formats.c:522
StereoToolsContext::phase
double phase
Definition: af_stereotools.c:43
StereoToolsContext::bmode_out
int bmode_out
Definition: af_stereotools.c:38
StereoToolsContext::phase_r
int phase_r
Definition: af_stereotools.c:35
StereoToolsContext::mode
int mode
Definition: af_stereotools.c:36
OFFSET
#define OFFSET(x)
Definition: af_stereotools.c:60
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:311
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
StereoToolsContext::level_out
double level_out
Definition: af_stereotools.c:53
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
StereoToolsContext
Definition: af_stereotools.c:28
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: af_stereotools.c:136
M_PI
#define M_PI
Definition: mathematics.h:67
StereoToolsContext::balance_in
double balance_in
Definition: af_stereotools.c:46
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:454
stereotools_options
static const AVOption stereotools_options[]
Definition: af_stereotools.c:63
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
StereoToolsContext::phase_sin_coef
double phase_sin_coef
Definition: af_stereotools.c:48
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:39
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Definition: mem.c:264
AVFilter
Filter definition.
Definition: avfilter.h:166
ret
ret
Definition: filter_design.txt:187
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:245
avfilter.h
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(stereotools)
L
#define L(x)
Definition: vpx_arith.h:36
AVFilterContext
An instance of a filter.
Definition: avfilter.h:407
mem.h
audio.h
StereoToolsContext::length
int length
Definition: af_stereotools.c:56
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:261
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
StereoToolsContext::sc_level
double sc_level
Definition: af_stereotools.c:50
AV_SAMPLE_FMT_DBL
@ AV_SAMPLE_FMT_DBL
double
Definition: samplefmt.h:61
StereoToolsContext::slev
double slev
Definition: af_stereotools.c:39
int
int
Definition: ffmpeg_filter.c:424
StereoToolsContext::level_in
double level_in
Definition: af_stereotools.c:52
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:254
StereoToolsContext::mute_r
int mute_r
Definition: af_stereotools.c:33
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:791
StereoToolsContext::bmode_in
int bmode_in
Definition: af_stereotools.c:37