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 "filters.h"
25 #include "formats.h"
26 #include "framesync.h"
27 #include "internal.h"
28 #include "video.h"
29 
30 typedef struct StreamSelectContext {
31  const AVClass *class;
32  int nb_inputs;
33  char *map_str;
34  int *map;
35  int nb_map;
36  int is_audio;
37  int64_t *last_pts;
41 
42 #define OFFSET(x) offsetof(StreamSelectContext, x)
43 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
44 static const AVOption streamselect_options[] = {
45  { "inputs", "number of input streams", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags=FLAGS },
46  { "map", "input indexes to remap to outputs", OFFSET(map_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags=FLAGS },
47  { NULL }
48 };
49 
50 AVFILTER_DEFINE_CLASS(streamselect);
51 
53 {
54  AVFilterContext *ctx = fs->parent;
56  AVFrame **in = s->frames;
57  int i, j, ret = 0, have_out = 0;
58 
59  for (i = 0; i < ctx->nb_inputs; i++) {
60  if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
61  return ret;
62  }
63 
64  for (j = 0; j < ctx->nb_inputs; j++) {
65  for (i = 0; i < s->nb_map; i++) {
66  if (s->map[i] == j) {
67  AVFrame *out;
68 
69  if (s->is_audio && s->last_pts[j] == in[j]->pts &&
70  ctx->outputs[i]->frame_count_in > 0)
71  continue;
72  out = av_frame_clone(in[j]);
73  if (!out)
74  return AVERROR(ENOMEM);
75 
76  out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, ctx->outputs[i]->time_base);
77  s->last_pts[j] = in[j]->pts;
78  ret = ff_filter_frame(ctx->outputs[i], out);
79  have_out = 1;
80  if (ret < 0)
81  return ret;
82  }
83  }
84  }
85 
86  if (!have_out)
87  ff_filter_set_ready(ctx, 100);
88  return ret;
89 }
90 
92 {
93  StreamSelectContext *s = ctx->priv;
94  return ff_framesync_activate(&s->fs);
95 }
96 
97 static int config_output(AVFilterLink *outlink)
98 {
99  AVFilterContext *ctx = outlink->src;
100  StreamSelectContext *s = ctx->priv;
101  const int outlink_idx = FF_OUTLINK_IDX(outlink);
102  const int inlink_idx = s->map[outlink_idx];
103  AVFilterLink *inlink = ctx->inputs[inlink_idx];
104  FFFrameSyncIn *in;
105  int i, ret;
106 
107  av_log(ctx, AV_LOG_VERBOSE, "config output link %d "
108  "with settings from input link %d\n",
109  outlink_idx, inlink_idx);
110 
111  switch (outlink->type) {
112  case AVMEDIA_TYPE_VIDEO:
113  outlink->w = inlink->w;
114  outlink->h = inlink->h;
115  outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
116  outlink->frame_rate = inlink->frame_rate;
117  break;
118  case AVMEDIA_TYPE_AUDIO:
119  outlink->sample_rate = inlink->sample_rate;
120  outlink->channels = inlink->channels;
121  outlink->channel_layout = inlink->channel_layout;
122  break;
123  }
124 
125  outlink->time_base = inlink->time_base;
126  outlink->format = inlink->format;
127 
128  if (s->fs.opaque == s)
129  return 0;
130 
131  if ((ret = ff_framesync_init(&s->fs, ctx, ctx->nb_inputs)) < 0)
132  return ret;
133 
134  in = s->fs.in;
135  s->fs.opaque = s;
137 
138  for (i = 0; i < ctx->nb_inputs; i++) {
139  in[i].time_base = ctx->inputs[i]->time_base;
140  in[i].sync = 1;
141  in[i].before = EXT_STOP;
142  in[i].after = EXT_STOP;
143  }
144 
145  s->frames = av_calloc(ctx->nb_inputs, sizeof(*s->frames));
146  if (!s->frames)
147  return AVERROR(ENOMEM);
148 
149  return ff_framesync_configure(&s->fs);
150 }
151 
152 static int parse_definition(AVFilterContext *ctx, int nb_pads, int is_input, int is_audio)
153 {
154  const char *padtype = is_input ? "in" : "out";
155  int i = 0, ret = 0;
156 
157  for (i = 0; i < nb_pads; i++) {
158  AVFilterPad pad = { 0 };
159 
160  pad.type = is_audio ? AVMEDIA_TYPE_AUDIO : AVMEDIA_TYPE_VIDEO;
161 
162  pad.name = av_asprintf("%sput%d", padtype, i);
163  if (!pad.name)
164  return AVERROR(ENOMEM);
165 
166  av_log(ctx, AV_LOG_DEBUG, "Add %s pad %s\n", padtype, pad.name);
167 
168  if (is_input) {
169  ret = ff_insert_inpad(ctx, i, &pad);
170  } else {
172  ret = ff_insert_outpad(ctx, i, &pad);
173  }
174 
175  if (ret < 0) {
176  av_freep(&pad.name);
177  return ret;
178  }
179  }
180 
181  return 0;
182 }
183 
184 static int parse_mapping(AVFilterContext *ctx, const char *map)
185 {
186  StreamSelectContext *s = ctx->priv;
187  int *new_map;
188  int new_nb_map = 0;
189 
190  if (!map) {
191  av_log(ctx, AV_LOG_ERROR, "mapping definition is not set\n");
192  return AVERROR(EINVAL);
193  }
194 
195  new_map = av_calloc(s->nb_inputs, sizeof(*new_map));
196  if (!new_map)
197  return AVERROR(ENOMEM);
198 
199  while (1) {
200  char *p;
201  const int n = strtol(map, &p, 0);
202 
203  av_log(ctx, AV_LOG_DEBUG, "n=%d map=%p p=%p\n", n, map, p);
204 
205  if (map == p)
206  break;
207  map = p;
208 
209  if (new_nb_map >= s->nb_inputs) {
210  av_log(ctx, AV_LOG_ERROR, "Unable to map more than the %d "
211  "input pads available\n", s->nb_inputs);
212  av_free(new_map);
213  return AVERROR(EINVAL);
214  }
215 
216  if (n < 0 || n >= ctx->nb_inputs) {
217  av_log(ctx, AV_LOG_ERROR, "Input stream index %d doesn't exist "
218  "(there is only %d input streams defined)\n",
219  n, s->nb_inputs);
220  av_free(new_map);
221  return AVERROR(EINVAL);
222  }
223 
224  av_log(ctx, AV_LOG_VERBOSE, "Map input stream %d to output stream %d\n", n, new_nb_map);
225  new_map[new_nb_map++] = n;
226  }
227 
228  if (!new_nb_map) {
229  av_log(ctx, AV_LOG_ERROR, "invalid mapping\n");
230  av_free(new_map);
231  return AVERROR(EINVAL);
232  }
233 
234  av_freep(&s->map);
235  s->map = new_map;
236  s->nb_map = new_nb_map;
237 
238  av_log(ctx, AV_LOG_VERBOSE, "%d map set\n", s->nb_map);
239 
240  return 0;
241 }
242 
243 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
244  char *res, int res_len, int flags)
245 {
246  if (!strcmp(cmd, "map")) {
247  int ret = parse_mapping(ctx, args);
248 
249  if (ret < 0)
250  return ret;
251  return avfilter_config_links(ctx);
252  }
253  return AVERROR(ENOSYS);
254 }
255 
257 {
258  StreamSelectContext *s = ctx->priv;
259  int ret, nb_outputs = 0;
260  char *map = s->map_str;
261 
262  if (!strcmp(ctx->filter->name, "astreamselect"))
263  s->is_audio = 1;
264 
265  for (; map;) {
266  char *p;
267 
268  strtol(map, &p, 0);
269  if (map == p)
270  break;
271  nb_outputs++;
272  map = p;
273  }
274 
275  s->last_pts = av_calloc(s->nb_inputs, sizeof(*s->last_pts));
276  if (!s->last_pts)
277  return AVERROR(ENOMEM);
278 
279  if ((ret = parse_definition(ctx, s->nb_inputs, 1, s->is_audio)) < 0 ||
280  (ret = parse_definition(ctx, nb_outputs, 0, s->is_audio)) < 0)
281  return ret;
282 
283  av_log(ctx, AV_LOG_DEBUG, "Configured with %d inpad and %d outpad\n",
284  ctx->nb_inputs, ctx->nb_outputs);
285 
286  return parse_mapping(ctx, s->map_str);
287 }
288 
290 {
291  StreamSelectContext *s = ctx->priv;
292 
293  av_freep(&s->last_pts);
294  av_freep(&s->map);
295  av_freep(&s->frames);
296  ff_framesync_uninit(&s->fs);
297 
298  for (int i = 0; i < ctx->nb_inputs; i++)
299  av_freep(&ctx->input_pads[i].name);
300 
301  for (int i = 0; i < ctx->nb_outputs; i++)
302  av_freep(&ctx->output_pads[i].name);
303 }
304 
306 {
309  int ret, i;
310 
311  for (i = 0; i < ctx->nb_inputs; i++) {
312  formats = ff_all_formats(ctx->inputs[i]->type);
313  if ((ret = ff_set_common_formats(ctx, formats)) < 0)
314  return ret;
315 
316  if (ctx->inputs[i]->type == AVMEDIA_TYPE_AUDIO) {
317  rates = ff_all_samplerates();
318  if ((ret = ff_set_common_samplerates(ctx, rates)) < 0)
319  return ret;
320  layouts = ff_all_channel_counts();
321  if ((ret = ff_set_common_channel_layouts(ctx, layouts)) < 0)
322  return ret;
323  }
324  }
325 
326  return 0;
327 }
328 
330  .name = "streamselect",
331  .description = NULL_IF_CONFIG_SMALL("Select video streams"),
332  .init = init,
333  .query_formats = query_formats,
334  .process_command = process_command,
335  .uninit = uninit,
336  .activate = activate,
337  .priv_size = sizeof(StreamSelectContext),
338  .priv_class = &streamselect_class,
340 };
341 
342 #define astreamselect_options streamselect_options
343 AVFILTER_DEFINE_CLASS(astreamselect);
344 
346  .name = "astreamselect",
347  .description = NULL_IF_CONFIG_SMALL("Select audio streams"),
348  .init = init,
349  .query_formats = query_formats,
350  .process_command = process_command,
351  .uninit = uninit,
352  .activate = activate,
353  .priv_size = sizeof(StreamSelectContext),
354  .priv_class = &astreamselect_class,
356 };
#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:550
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:295
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:1093
AVFilterPad * output_pads
array of output pads
Definition: avfilter.h:349
#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:388
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:349
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
AVFilterPad * input_pads
array of input pads
Definition: avfilter.h:345
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#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:569
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:394
#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
void ff_filter_set_ready(AVFilterContext *filter, unsigned priority)
Mark a filter ready and schedule it for activation.
Definition: avfilter.c:193
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:409
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:557
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