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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 
51 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
52 {
53  StreamSelectContext *s = inlink->dst->priv;
54  return ff_framesync_filter_frame(&s->fs, inlink, in);
55 }
56 
57 static int process_frame(FFFrameSync *fs)
58 {
59  AVFilterContext *ctx = fs->parent;
61  AVFrame **in = s->frames;
62  int i, j, ret = 0;
63 
64  for (i = 0; i < ctx->nb_inputs; i++) {
65  if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
66  return ret;
67  }
68 
69  for (j = 0; j < ctx->nb_inputs; j++) {
70  for (i = 0; i < s->nb_map; i++) {
71  if (s->map[i] == j) {
72  AVFrame *out;
73 
74  if (s->is_audio && s->last_pts[j] == in[j]->pts &&
75  ctx->outputs[i]->frame_count > 0)
76  continue;
77  out = av_frame_clone(in[j]);
78  if (!out)
79  return AVERROR(ENOMEM);
80 
81  out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, ctx->outputs[i]->time_base);
82  s->last_pts[j] = in[j]->pts;
83  ret = ff_filter_frame(ctx->outputs[i], out);
84  if (ret < 0)
85  return ret;
86  }
87  }
88  }
89 
90  return ret;
91 }
92 
93 static int request_frame(AVFilterLink *outlink)
94 {
95  StreamSelectContext *s = outlink->src->priv;
96  return ff_framesync_request_frame(&s->fs, outlink);
97 }
98 
99 static int config_output(AVFilterLink *outlink)
100 {
101  AVFilterContext *ctx = outlink->src;
102  StreamSelectContext *s = ctx->priv;
103  const int outlink_idx = FF_OUTLINK_IDX(outlink);
104  const int inlink_idx = s->map[outlink_idx];
105  AVFilterLink *inlink = ctx->inputs[inlink_idx];
106  FFFrameSyncIn *in;
107  int i, ret;
108 
109  av_log(ctx, AV_LOG_VERBOSE, "config output link %d "
110  "with settings from input link %d\n",
111  outlink_idx, inlink_idx);
112 
113  switch (outlink->type) {
114  case AVMEDIA_TYPE_VIDEO:
115  outlink->w = inlink->w;
116  outlink->h = inlink->h;
117  outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
118  outlink->frame_rate = inlink->frame_rate;
119  break;
120  case AVMEDIA_TYPE_AUDIO:
121  outlink->sample_rate = inlink->sample_rate;
122  outlink->channels = inlink->channels;
123  outlink->channel_layout = inlink->channel_layout;
124  break;
125  }
126 
127  outlink->time_base = inlink->time_base;
128  outlink->format = inlink->format;
129 
130  if (s->fs.opaque == s)
131  return 0;
132 
133  if ((ret = ff_framesync_init(&s->fs, ctx, ctx->nb_inputs)) < 0)
134  return ret;
135 
136  in = s->fs.in;
137  s->fs.opaque = s;
139 
140  for (i = 0; i < ctx->nb_inputs; i++) {
141  in[i].time_base = ctx->inputs[i]->time_base;
142  in[i].sync = 1;
143  in[i].before = EXT_STOP;
144  in[i].after = EXT_STOP;
145  }
146 
147  s->frames = av_calloc(ctx->nb_inputs, sizeof(*s->frames));
148  if (!s->frames)
149  return AVERROR(ENOMEM);
150 
151  return ff_framesync_configure(&s->fs);
152 }
153 
154 static int parse_definition(AVFilterContext *ctx, int nb_pads, void *filter_frame, int is_audio)
155 {
156  const int is_input = !!filter_frame;
157  const char *padtype = is_input ? "in" : "out";
158  int i = 0, ret = 0;
159 
160  for (i = 0; i < nb_pads; i++) {
161  AVFilterPad pad = { 0 };
162 
163  pad.type = is_audio ? AVMEDIA_TYPE_AUDIO : AVMEDIA_TYPE_VIDEO;
164 
165  pad.name = av_asprintf("%sput%d", padtype, i);
166  if (!pad.name)
167  return AVERROR(ENOMEM);
168 
169  av_log(ctx, AV_LOG_DEBUG, "Add %s pad %s\n", padtype, pad.name);
170 
171  if (is_input) {
173  ret = ff_insert_inpad(ctx, i, &pad);
174  } else {
177  ret = ff_insert_outpad(ctx, i, &pad);
178  }
179 
180  if (ret < 0) {
181  av_freep(&pad.name);
182  return ret;
183  }
184  }
185 
186  return 0;
187 }
188 
189 static int parse_mapping(AVFilterContext *ctx, const char *map)
190 {
191  StreamSelectContext *s = ctx->priv;
192  int *new_map;
193  int new_nb_map = 0;
194 
195  if (!map) {
196  av_log(ctx, AV_LOG_ERROR, "mapping definition is not set\n");
197  return AVERROR(EINVAL);
198  }
199 
200  new_map = av_calloc(s->nb_inputs, sizeof(*new_map));
201  if (!new_map)
202  return AVERROR(ENOMEM);
203 
204  while (1) {
205  char *p;
206  const int n = strtol(map, &p, 0);
207 
208  av_log(ctx, AV_LOG_DEBUG, "n=%d map=%p p=%p\n", n, map, p);
209 
210  if (map == p)
211  break;
212  map = p;
213 
214  if (new_nb_map >= s->nb_inputs) {
215  av_log(ctx, AV_LOG_ERROR, "Unable to map more than the %d "
216  "input pads available\n", s->nb_inputs);
217  av_free(new_map);
218  return AVERROR(EINVAL);
219  }
220 
221  if (n < 0 || n >= ctx->nb_inputs) {
222  av_log(ctx, AV_LOG_ERROR, "Input stream index %d doesn't exist "
223  "(there is only %d input streams defined)\n",
224  n, s->nb_inputs);
225  av_free(new_map);
226  return AVERROR(EINVAL);
227  }
228 
229  av_log(ctx, AV_LOG_VERBOSE, "Map input stream %d to output stream %d\n", n, new_nb_map);
230  new_map[new_nb_map++] = n;
231  }
232 
233  if (!new_nb_map) {
234  av_log(ctx, AV_LOG_ERROR, "invalid mapping\n");
235  av_free(new_map);
236  return AVERROR(EINVAL);
237  }
238 
239  av_freep(&s->map);
240  s->map = new_map;
241  s->nb_map = new_nb_map;
242 
243  av_log(ctx, AV_LOG_VERBOSE, "%d map set\n", s->nb_map);
244 
245  return 0;
246 }
247 
248 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
249  char *res, int res_len, int flags)
250 {
251  if (!strcmp(cmd, "map")) {
252  int ret = parse_mapping(ctx, args);
253 
254  if (ret < 0)
255  return ret;
256  return avfilter_config_links(ctx);
257  }
258  return AVERROR(ENOSYS);
259 }
260 
262 {
263  StreamSelectContext *s = ctx->priv;
264  int ret, nb_outputs = 0;
265  char *map = s->map_str;
266 
267  if (!strcmp(ctx->filter->name, "astreamselect"))
268  s->is_audio = 1;
269 
270  for (; map;) {
271  char *p;
272 
273  strtol(map, &p, 0);
274  if (map == p)
275  break;
276  nb_outputs++;
277  map = p;
278  }
279 
280  s->last_pts = av_calloc(s->nb_inputs, sizeof(*s->last_pts));
281  if (!s->last_pts)
282  return AVERROR(ENOMEM);
283 
284  if ((ret = parse_definition(ctx, s->nb_inputs, filter_frame, s->is_audio)) < 0 ||
285  (ret = parse_definition(ctx, nb_outputs, NULL, s->is_audio)) < 0)
286  return ret;
287 
288  av_log(ctx, AV_LOG_DEBUG, "Configured with %d inpad and %d outpad\n",
289  ctx->nb_inputs, ctx->nb_outputs);
290 
291  return parse_mapping(ctx, s->map_str);
292 }
293 
295 {
296  StreamSelectContext *s = ctx->priv;
297 
298  av_freep(&s->last_pts);
299  av_freep(&s->map);
300  av_freep(&s->frames);
301  ff_framesync_uninit(&s->fs);
302 }
303 
305 {
308  int ret, i;
309 
310  for (i = 0; i < ctx->nb_inputs; i++) {
311  formats = ff_all_formats(ctx->inputs[i]->type);
312  if ((ret = ff_set_common_formats(ctx, formats)) < 0)
313  return ret;
314 
315  if (ctx->inputs[i]->type == AVMEDIA_TYPE_AUDIO) {
316  rates = ff_all_samplerates();
317  if ((ret = ff_set_common_samplerates(ctx, rates)) < 0)
318  return ret;
319  layouts = ff_all_channel_counts();
320  if ((ret = ff_set_common_channel_layouts(ctx, layouts)) < 0)
321  return ret;
322  }
323  }
324 
325  return 0;
326 }
327 
329  .name = "streamselect",
330  .description = NULL_IF_CONFIG_SMALL("Select video streams"),
331  .init = init,
332  .query_formats = query_formats,
333  .process_command = process_command,
334  .uninit = uninit,
335  .priv_size = sizeof(StreamSelectContext),
336  .priv_class = &streamselect_class,
338 };
339 
340 #define astreamselect_options streamselect_options
341 AVFILTER_DEFINE_CLASS(astreamselect);
342 
344  .name = "astreamselect",
345  .description = NULL_IF_CONFIG_SMALL("Select audio streams"),
346  .init = init,
347  .query_formats = query_formats,
348  .process_command = process_command,
349  .uninit = uninit,
350  .priv_size = sizeof(StreamSelectContext),
351  .priv_class = &astreamselect_class,
353 };
#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
const char * s
Definition: avisynth_c.h:768
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:184
static av_cold void uninit(AVFilterContext *ctx)
AVOption.
Definition: opt.h:245
static int query_formats(AVFilterContext *ctx)
static av_cold int init(AVFilterContext *ctx)
Main libavfilter public API header.
int(* on_event)(struct FFFrameSync *fs)
Callback called when a frame event is ready.
Definition: framesync.h:175
#define AVFILTER_FLAG_DYNAMIC_INPUTS
The number of the filter inputs is not determined just by AVFilter.inputs.
Definition: avfilter.h:105
static enum AVSampleFormat formats[]
Definition: avresample.c:163
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:64
#define FF_OUTLINK_IDX(link)
Definition: internal.h:354
int ff_framesync_configure(FFFrameSync *fs)
Configure a frame sync structure.
Definition: framesync.c:77
static int parse_definition(AVFilterContext *ctx, int nb_pads, void *filter_frame, int is_audio)
int64_t pts
Timestamp of the current event.
Definition: framesync.h:170
enum FFFrameSyncExtMode before
Extrapolation mode for timestamps before the first frame.
Definition: framesync.h:93
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
Definition: mem.c:260
AVFilter ff_vf_streamselect
const char * name
Pad name.
Definition: internal.h:59
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:315
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1189
#define av_cold
Definition: attributes.h:82
int(* request_frame)(AVFilterLink *link)
Frame request callback.
Definition: internal.h:112
AVOptions.
void * parent
Definition: framesync.h:155
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:268
FFFrameSyncIn * in
Pointer to array of inputs.
Definition: framesync.h:206
int avfilter_config_links(AVFilterContext *filter)
Negotiate the media format, dimensions, etc of all inputs to a filter.
Definition: avfilter.c:237
#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:98
#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:83
#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:53
static int request_frame(AVFilterLink *outlink)
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
int ff_framesync_filter_frame(FFFrameSync *fs, AVFilterLink *inlink, AVFrame *in)
Accept a frame on a filter input.
Definition: framesync.c:300
#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:266
Frame sync structure.
Definition: framesync.h:153
#define AVERROR(e)
Definition: error.h:43
unsigned nb_outputs
number of output pads
Definition: avfilter.h:320
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
void * priv
private data for use by the filter
Definition: avfilter.h:322
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int(* filter_frame)(AVFilterLink *link, AVFrame *frame)
Filtering callback.
Definition: internal.h:92
AVRational time_base
Time base for the incoming frames.
Definition: framesync.h:103
char * av_asprintf(const char *fmt,...)
Definition: avstring.c:113
common internal API header
unsigned nb_inputs
number of input pads
Definition: avfilter.h:316
int ff_framesync_request_frame(FFFrameSync *fs, AVFilterLink *outlink)
Request a frame on the filter output.
Definition: framesync.c:314
AVFormatContext * ctx
Definition: movenc.c:48
AVRational time_base
Time base for the output events.
Definition: framesync.h:165
int n
Definition: avisynth_c.h:684
void * opaque
Opaque pointer, not used by the API.
Definition: framesync.h:180
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:480
A list of supported channel layouts.
Definition: formats.h:85
static int parse_mapping(AVFilterContext *ctx, const char *map)
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;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);returnNULL;}returnac;}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;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->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);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
int ff_framesync_init(FFFrameSync *fs, void *parent, unsigned nb_in)
Initialize a frame sync structure.
Definition: framesync.c:49
unsigned sync
Synchronization level: frames on input at the highest sync level will generate output frame events...
Definition: framesync.h:146
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
const VDPAUPixFmtMap * map
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:319
enum MovChannelLayoutTag * layouts
Definition: mov_chan.c:434
AVFilterFormats * ff_all_samplerates(void)
Definition: formats.c:395
#define OFFSET(x)
static int flags
Definition: cpu.c:47
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
AVFilter ff_af_astreamselect
Completely stop all streams with this one.
Definition: framesync.h:67
#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:307
FILE * out
Definition: movenc.c:54
#define av_freep(p)
int(* config_props)(AVFilterLink *link)
Link configuration callback.
Definition: internal.h:128
static const AVOption streamselect_options[]
internal API functions
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:229
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:291
const AVFilter * filter
the AVFilter of which this is an instance
Definition: avfilter.h:310
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:283