FFmpeg
f_streamselect.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "libavutil/avstring.h"
20 #include "libavutil/internal.h"
21 #include "libavutil/opt.h"
22 #include "avfilter.h"
23 #include "audio.h"
24 #include "formats.h"
25 #include "framesync.h"
26 #include "internal.h"
27 #include "video.h"
28 
29 typedef struct StreamSelectContext {
30  const AVClass *class;
31  int nb_inputs;
32  char *map_str;
33  int *map;
34  int nb_map;
35  int is_audio;
36  int64_t *last_pts;
40 
41 #define OFFSET(x) offsetof(StreamSelectContext, x)
42 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
43 static const AVOption streamselect_options[] = {
44  { "inputs", "number of input streams", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags=FLAGS },
45  { "map", "input indexes to remap to outputs", OFFSET(map_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags=FLAGS },
46  { NULL }
47 };
48 
49 AVFILTER_DEFINE_CLASS(streamselect);
50 
52 {
53  AVFilterContext *ctx = fs->parent;
55  AVFrame **in = s->frames;
56  int i, j, ret = 0;
57 
58  for (i = 0; i < ctx->nb_inputs; i++) {
59  if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
60  return ret;
61  }
62 
63  for (j = 0; j < ctx->nb_inputs; j++) {
64  for (i = 0; i < s->nb_map; i++) {
65  if (s->map[i] == j) {
66  AVFrame *out;
67 
68  if (s->is_audio && s->last_pts[j] == in[j]->pts &&
69  ctx->outputs[i]->frame_count_in > 0)
70  continue;
71  out = av_frame_clone(in[j]);
72  if (!out)
73  return AVERROR(ENOMEM);
74 
75  out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, ctx->outputs[i]->time_base);
76  s->last_pts[j] = in[j]->pts;
77  ret = ff_filter_frame(ctx->outputs[i], out);
78  if (ret < 0)
79  return ret;
80  }
81  }
82  }
83 
84  return ret;
85 }
86 
88 {
89  StreamSelectContext *s = ctx->priv;
90  return ff_framesync_activate(&s->fs);
91 }
92 
93 static int config_output(AVFilterLink *outlink)
94 {
95  AVFilterContext *ctx = outlink->src;
96  StreamSelectContext *s = ctx->priv;
97  const int outlink_idx = FF_OUTLINK_IDX(outlink);
98  const int inlink_idx = s->map[outlink_idx];
99  AVFilterLink *inlink = ctx->inputs[inlink_idx];
100  FFFrameSyncIn *in;
101  int i, ret;
102 
103  av_log(ctx, AV_LOG_VERBOSE, "config output link %d "
104  "with settings from input link %d\n",
105  outlink_idx, inlink_idx);
106 
107  switch (outlink->type) {
108  case AVMEDIA_TYPE_VIDEO:
109  outlink->w = inlink->w;
110  outlink->h = inlink->h;
111  outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
112  outlink->frame_rate = inlink->frame_rate;
113  break;
114  case AVMEDIA_TYPE_AUDIO:
115  outlink->sample_rate = inlink->sample_rate;
116  outlink->channels = inlink->channels;
117  outlink->channel_layout = inlink->channel_layout;
118  break;
119  }
120 
121  outlink->time_base = inlink->time_base;
122  outlink->format = inlink->format;
123 
124  if (s->fs.opaque == s)
125  return 0;
126 
127  if ((ret = ff_framesync_init(&s->fs, ctx, ctx->nb_inputs)) < 0)
128  return ret;
129 
130  in = s->fs.in;
131  s->fs.opaque = s;
133 
134  for (i = 0; i < ctx->nb_inputs; i++) {
135  in[i].time_base = ctx->inputs[i]->time_base;
136  in[i].sync = 1;
137  in[i].before = EXT_STOP;
138  in[i].after = EXT_STOP;
139  }
140 
141  s->frames = av_calloc(ctx->nb_inputs, sizeof(*s->frames));
142  if (!s->frames)
143  return AVERROR(ENOMEM);
144 
145  return ff_framesync_configure(&s->fs);
146 }
147 
148 static int parse_definition(AVFilterContext *ctx, int nb_pads, int is_input, int is_audio)
149 {
150  const char *padtype = is_input ? "in" : "out";
151  int i = 0, ret = 0;
152 
153  for (i = 0; i < nb_pads; i++) {
154  AVFilterPad pad = { 0 };
155 
156  pad.type = is_audio ? AVMEDIA_TYPE_AUDIO : AVMEDIA_TYPE_VIDEO;
157 
158  pad.name = av_asprintf("%sput%d", padtype, i);
159  if (!pad.name)
160  return AVERROR(ENOMEM);
161 
162  av_log(ctx, AV_LOG_DEBUG, "Add %s pad %s\n", padtype, pad.name);
163 
164  if (is_input) {
165  ret = ff_insert_inpad(ctx, i, &pad);
166  } else {
168  ret = ff_insert_outpad(ctx, i, &pad);
169  }
170 
171  if (ret < 0) {
172  av_freep(&pad.name);
173  return ret;
174  }
175  }
176 
177  return 0;
178 }
179 
180 static int parse_mapping(AVFilterContext *ctx, const char *map)
181 {
182  StreamSelectContext *s = ctx->priv;
183  int *new_map;
184  int new_nb_map = 0;
185 
186  if (!map) {
187  av_log(ctx, AV_LOG_ERROR, "mapping definition is not set\n");
188  return AVERROR(EINVAL);
189  }
190 
191  new_map = av_calloc(s->nb_inputs, sizeof(*new_map));
192  if (!new_map)
193  return AVERROR(ENOMEM);
194 
195  while (1) {
196  char *p;
197  const int n = strtol(map, &p, 0);
198 
199  av_log(ctx, AV_LOG_DEBUG, "n=%d map=%p p=%p\n", n, map, p);
200 
201  if (map == p)
202  break;
203  map = p;
204 
205  if (new_nb_map >= s->nb_inputs) {
206  av_log(ctx, AV_LOG_ERROR, "Unable to map more than the %d "
207  "input pads available\n", s->nb_inputs);
208  av_free(new_map);
209  return AVERROR(EINVAL);
210  }
211 
212  if (n < 0 || n >= ctx->nb_inputs) {
213  av_log(ctx, AV_LOG_ERROR, "Input stream index %d doesn't exist "
214  "(there is only %d input streams defined)\n",
215  n, s->nb_inputs);
216  av_free(new_map);
217  return AVERROR(EINVAL);
218  }
219 
220  av_log(ctx, AV_LOG_VERBOSE, "Map input stream %d to output stream %d\n", n, new_nb_map);
221  new_map[new_nb_map++] = n;
222  }
223 
224  if (!new_nb_map) {
225  av_log(ctx, AV_LOG_ERROR, "invalid mapping\n");
226  av_free(new_map);
227  return AVERROR(EINVAL);
228  }
229 
230  av_freep(&s->map);
231  s->map = new_map;
232  s->nb_map = new_nb_map;
233 
234  av_log(ctx, AV_LOG_VERBOSE, "%d map set\n", s->nb_map);
235 
236  return 0;
237 }
238 
239 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
240  char *res, int res_len, int flags)
241 {
242  if (!strcmp(cmd, "map")) {
243  int ret = parse_mapping(ctx, args);
244 
245  if (ret < 0)
246  return ret;
247  return avfilter_config_links(ctx);
248  }
249  return AVERROR(ENOSYS);
250 }
251 
253 {
254  StreamSelectContext *s = ctx->priv;
255  int ret, nb_outputs = 0;
256  char *map = s->map_str;
257 
258  if (!strcmp(ctx->filter->name, "astreamselect"))
259  s->is_audio = 1;
260 
261  for (; map;) {
262  char *p;
263 
264  strtol(map, &p, 0);
265  if (map == p)
266  break;
267  nb_outputs++;
268  map = p;
269  }
270 
271  s->last_pts = av_calloc(s->nb_inputs, sizeof(*s->last_pts));
272  if (!s->last_pts)
273  return AVERROR(ENOMEM);
274 
275  if ((ret = parse_definition(ctx, s->nb_inputs, 1, s->is_audio)) < 0 ||
276  (ret = parse_definition(ctx, nb_outputs, 0, s->is_audio)) < 0)
277  return ret;
278 
279  av_log(ctx, AV_LOG_DEBUG, "Configured with %d inpad and %d outpad\n",
280  ctx->nb_inputs, ctx->nb_outputs);
281 
282  return parse_mapping(ctx, s->map_str);
283 }
284 
286 {
287  StreamSelectContext *s = ctx->priv;
288 
289  av_freep(&s->last_pts);
290  av_freep(&s->map);
291  av_freep(&s->frames);
292  ff_framesync_uninit(&s->fs);
293 }
294 
296 {
299  int ret, i;
300 
301  for (i = 0; i < ctx->nb_inputs; i++) {
302  formats = ff_all_formats(ctx->inputs[i]->type);
303  if ((ret = ff_set_common_formats(ctx, formats)) < 0)
304  return ret;
305 
306  if (ctx->inputs[i]->type == AVMEDIA_TYPE_AUDIO) {
307  rates = ff_all_samplerates();
308  if ((ret = ff_set_common_samplerates(ctx, rates)) < 0)
309  return ret;
310  layouts = ff_all_channel_counts();
311  if ((ret = ff_set_common_channel_layouts(ctx, layouts)) < 0)
312  return ret;
313  }
314  }
315 
316  return 0;
317 }
318 
320  .name = "streamselect",
321  .description = NULL_IF_CONFIG_SMALL("Select video streams"),
322  .init = init,
323  .query_formats = query_formats,
324  .process_command = process_command,
325  .uninit = uninit,
326  .activate = activate,
327  .priv_size = sizeof(StreamSelectContext),
328  .priv_class = &streamselect_class,
330 };
331 
332 #define astreamselect_options streamselect_options
333 AVFILTER_DEFINE_CLASS(astreamselect);
334 
336  .name = "astreamselect",
337  .description = NULL_IF_CONFIG_SMALL("Select audio streams"),
338  .init = init,
339  .query_formats = query_formats,
340  .process_command = process_command,
341  .uninit = uninit,
342  .activate = activate,
343  .priv_size = sizeof(StreamSelectContext),
344  .priv_class = &astreamselect_class,
346 };
#define NULL
Definition: coverity.c:32
int ff_set_common_channel_layouts(AVFilterContext *ctx, AVFilterChannelLayouts *layouts)
A helper for query_formats() which sets all links to the same list of channel layouts/sample rates...
Definition: formats.c:549
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
This structure describes decoded (raw) audio or video data.
Definition: frame.h:268
static av_cold void uninit(AVFilterContext *ctx)
static int parse_definition(AVFilterContext *ctx, int nb_pads, int is_input, int is_audio)
AVOption.
Definition: opt.h:246
static int query_formats(AVFilterContext *ctx)
static av_cold int init(AVFilterContext *ctx)
Main libavfilter public API header.
#define AVFILTER_FLAG_DYNAMIC_INPUTS
The number of the filter inputs is not determined just by AVFilter.inputs.
Definition: avfilter.h:105
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:65
#define FF_OUTLINK_IDX(link)
Definition: internal.h:349
int ff_framesync_configure(FFFrameSync *fs)
Configure a frame sync structure.
Definition: framesync.c:117
int64_t pts
Timestamp of the current event.
Definition: framesync.h:167
enum FFFrameSyncExtMode before
Extrapolation mode for timestamps before the first frame.
Definition: framesync.h:86
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
Definition: mem.c:244
AVFilter ff_vf_streamselect
const char * name
Pad name.
Definition: internal.h:60
AVFilterContext * parent
Parent filter context.
Definition: framesync.h:152
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:346
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1080
#define av_cold
Definition: attributes.h:82
AVOptions.
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:361
FFFrameSyncIn * in
Pointer to array of inputs.
Definition: framesync.h:203
int avfilter_config_links(AVFilterContext *filter)
Negotiate the media format, dimensions, etc of all inputs to a filter.
Definition: avfilter.c:277
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
static int config_output(AVFilterLink *outlink)
enum FFFrameSyncExtMode after
Extrapolation mode for timestamps after the last frame.
Definition: framesync.h:91
#define AVFILTER_FLAG_DYNAMIC_OUTPUTS
The number of the filter outputs is not determined just by AVFilter.outputs.
Definition: avfilter.h:111
Input stream structure.
Definition: framesync.h:81
#define av_log(a,...)
AVFilterFormats * ff_all_formats(enum AVMediaType type)
Return a list of all formats supported by FFmpeg for the given media type.
Definition: formats.c:350
A filter pad used for either input or output.
Definition: internal.h:54
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:260
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
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:568
void ff_framesync_uninit(FFFrameSync *fs)
Free all memory currently allocated.
Definition: framesync.c:293
Frame sync structure.
Definition: framesync.h:146
unsigned nb_outputs
number of output pads
Definition: avfilter.h:351
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
void * priv
private data for use by the filter
Definition: avfilter.h:353
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
AVRational time_base
Time base for the incoming frames.
Definition: framesync.h:96
int ff_framesync_activate(FFFrameSync *fs)
Examine the frames in the filter&#39;s input and try to produce output.
Definition: framesync.c:344
int(* on_event)(struct FFFrameSync *fs)
Callback called when a frame event is ready.
Definition: framesync.h:172
char * av_asprintf(const char *fmt,...)
Definition: avstring.c:113
common internal API header
int(* config_props)(AVFilterLink *link)
Link configuration callback.
Definition: internal.h:129
static int activate(AVFilterContext *ctx)
unsigned nb_inputs
number of input pads
Definition: avfilter.h:347
AVFormatContext * ctx
Definition: movenc.c:48
AVRational time_base
Time base for the output events.
Definition: framesync.h:162
#define s(width, name)
Definition: cbs_vp9.c:257
int n
Definition: avisynth_c.h:760
void * opaque
Opaque pointer, not used by the API.
Definition: framesync.h:177
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:540
A list of supported channel layouts.
Definition: formats.h:85
static int parse_mapping(AVFilterContext *ctx, const char *map)
int ff_framesync_init(FFFrameSync *fs, AVFilterContext *parent, unsigned nb_in)
Initialize a frame sync structure.
Definition: framesync.c:77
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31))))#define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac){}void ff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map){AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);return NULL;}return ac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;}int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){int use_generic=1;int len=in->nb_samples;int p;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
unsigned sync
Synchronization level: frames on input at the highest sync level will generate output frame events...
Definition: framesync.h:139
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
#define FLAGS
const char * name
Filter name.
Definition: avfilter.h:148
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
enum MovChannelLayoutTag * layouts
Definition: mov_chan.c:434
AVFilterFormats * ff_all_samplerates(void)
Definition: formats.c:395
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define OFFSET(x)
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
AVFilter ff_af_astreamselect
Completely stop all streams with this one.
Definition: framesync.h:65
#define av_free(p)
static int process_frame(FFFrameSync *fs)
A list of supported formats for one end of a filter link.
Definition: formats.h:64
An instance of a filter.
Definition: avfilter.h:338
FILE * out
Definition: movenc.c:54
#define av_freep(p)
static const AVOption streamselect_options[]
formats
Definition: signature.h:48
internal API functions
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
AVFilterChannelLayouts * ff_all_channel_counts(void)
Construct an AVFilterChannelLayouts coding for any channel layout, with known or unknown disposition...
Definition: formats.c:410
int ff_framesync_get_frame(FFFrameSync *fs, unsigned in, AVFrame **rframe, unsigned get)
Get the current frame in an input.
Definition: framesync.c:256
static const int rates[]
Definition: avresample.c:176
static int ff_insert_outpad(AVFilterContext *f, unsigned index, AVFilterPad *p)
Insert a new output pad for the filter.
Definition: internal.h:285
const AVFilter * filter
the AVFilter of which this is an instance
Definition: avfilter.h:341
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:556
AVFILTER_DEFINE_CLASS(streamselect)
static int ff_insert_inpad(AVFilterContext *f, unsigned index, AVFilterPad *p)
Insert a new input pad for the filter.
Definition: internal.h:277