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af_join.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 /**
20  * @file
21  * Audio join filter
22  *
23  * Join multiple audio inputs as different channels in
24  * a single output
25  */
26 
27 #include "libavutil/avassert.h"
29 #include "libavutil/common.h"
30 #include "libavutil/opt.h"
31 
32 #include "audio.h"
33 #include "avfilter.h"
34 #include "formats.h"
35 #include "internal.h"
36 
37 typedef struct ChannelMap {
38  int input; ///< input stream index
39  int in_channel_idx; ///< index of in_channel in the input stream data
40  uint64_t in_channel; ///< layout describing the input channel
41  uint64_t out_channel; ///< layout describing the output channel
42 } ChannelMap;
43 
44 typedef struct JoinContext {
45  const AVClass *class;
46 
47  int inputs;
48  char *map;
50  uint64_t channel_layout;
51 
54 
55  /**
56  * Temporary storage for input frames, until we get one on each input.
57  */
59 
60  /**
61  * Temporary storage for buffer references, for assembling the output frame.
62  */
64 } JoinContext;
65 
66 #define OFFSET(x) offsetof(JoinContext, x)
67 #define A AV_OPT_FLAG_AUDIO_PARAM
68 #define F AV_OPT_FLAG_FILTERING_PARAM
69 static const AVOption join_options[] = {
70  { "inputs", "Number of input streams.", OFFSET(inputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, A|F },
71  { "channel_layout", "Channel layout of the "
72  "output stream.", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, A|F },
73  { "map", "A comma-separated list of channels maps in the format "
74  "'input_stream.input_channel-output_channel.",
75  OFFSET(map), AV_OPT_TYPE_STRING, .flags = A|F },
76  { NULL }
77 };
78 
80 
82 {
83  AVFilterContext *ctx = link->dst;
84  JoinContext *s = ctx->priv;
85  int i;
86 
87  for (i = 0; i < ctx->nb_inputs; i++)
88  if (link == ctx->inputs[i])
89  break;
90  av_assert0(i < ctx->nb_inputs);
91  av_assert0(!s->input_frames[i]);
92  s->input_frames[i] = frame;
93 
94  return 0;
95 }
96 
97 static int parse_maps(AVFilterContext *ctx)
98 {
99  JoinContext *s = ctx->priv;
100  char separator = '|';
101  char *cur = s->map;
102 
103 #if FF_API_OLD_FILTER_OPTS
104  if (cur && strchr(cur, ',')) {
105  av_log(ctx, AV_LOG_WARNING, "This syntax is deprecated, use '|' to "
106  "separate the mappings.\n");
107  separator = ',';
108  }
109 #endif
110 
111  while (cur && *cur) {
112  char *sep, *next, *p;
113  uint64_t in_channel = 0, out_channel = 0;
114  int input_idx, out_ch_idx, in_ch_idx;
115 
116  next = strchr(cur, separator);
117  if (next)
118  *next++ = 0;
119 
120  /* split the map into input and output parts */
121  if (!(sep = strchr(cur, '-'))) {
122  av_log(ctx, AV_LOG_ERROR, "Missing separator '-' in channel "
123  "map '%s'\n", cur);
124  return AVERROR(EINVAL);
125  }
126  *sep++ = 0;
127 
128 #define PARSE_CHANNEL(str, var, inout) \
129  if (!(var = av_get_channel_layout(str))) { \
130  av_log(ctx, AV_LOG_ERROR, "Invalid " inout " channel: %s.\n", str);\
131  return AVERROR(EINVAL); \
132  } \
133  if (av_get_channel_layout_nb_channels(var) != 1) { \
134  av_log(ctx, AV_LOG_ERROR, "Channel map describes more than one " \
135  inout " channel.\n"); \
136  return AVERROR(EINVAL); \
137  }
138 
139  /* parse output channel */
140  PARSE_CHANNEL(sep, out_channel, "output");
141  if (!(out_channel & s->channel_layout)) {
142  av_log(ctx, AV_LOG_ERROR, "Output channel '%s' is not present in "
143  "requested channel layout.\n", sep);
144  return AVERROR(EINVAL);
145  }
146 
148  out_channel);
149  if (s->channels[out_ch_idx].input >= 0) {
150  av_log(ctx, AV_LOG_ERROR, "Multiple maps for output channel "
151  "'%s'.\n", sep);
152  return AVERROR(EINVAL);
153  }
154 
155  /* parse input channel */
156  input_idx = strtol(cur, &cur, 0);
157  if (input_idx < 0 || input_idx >= s->inputs) {
158  av_log(ctx, AV_LOG_ERROR, "Invalid input stream index: %d.\n",
159  input_idx);
160  return AVERROR(EINVAL);
161  }
162 
163  if (*cur)
164  cur++;
165 
166  in_ch_idx = strtol(cur, &p, 0);
167  if (p == cur) {
168  /* channel specifier is not a number,
169  * try to parse as channel name */
170  PARSE_CHANNEL(cur, in_channel, "input");
171  }
172 
173  s->channels[out_ch_idx].input = input_idx;
174  if (in_channel)
175  s->channels[out_ch_idx].in_channel = in_channel;
176  else
177  s->channels[out_ch_idx].in_channel_idx = in_ch_idx;
178 
179  cur = next;
180  }
181  return 0;
182 }
183 
185 {
186  JoinContext *s = ctx->priv;
187  int ret, i;
188 
190  av_log(ctx, AV_LOG_ERROR, "Error parsing channel layout '%s'.\n",
191  s->channel_layout_str);
192  return AVERROR(EINVAL);
193  }
194 
196  s->channels = av_mallocz_array(s->nb_channels, sizeof(*s->channels));
197  s->buffers = av_mallocz_array(s->nb_channels, sizeof(*s->buffers));
198  s->input_frames = av_mallocz_array(s->inputs, sizeof(*s->input_frames));
199  if (!s->channels || !s->buffers|| !s->input_frames)
200  return AVERROR(ENOMEM);
201 
202  for (i = 0; i < s->nb_channels; i++) {
204  s->channels[i].input = -1;
205  }
206 
207  if ((ret = parse_maps(ctx)) < 0)
208  return ret;
209 
210  for (i = 0; i < s->inputs; i++) {
211  char name[32];
212  AVFilterPad pad = { 0 };
213 
214  snprintf(name, sizeof(name), "input%d", i);
215  pad.type = AVMEDIA_TYPE_AUDIO;
216  pad.name = av_strdup(name);
217  if (!pad.name)
218  return AVERROR(ENOMEM);
220 
221  pad.needs_fifo = 1;
222 
223  ff_insert_inpad(ctx, i, &pad);
224  }
225 
226  return 0;
227 }
228 
230 {
231  JoinContext *s = ctx->priv;
232  int i;
233 
234  for (i = 0; i < ctx->nb_inputs; i++) {
235  av_freep(&ctx->input_pads[i].name);
236  av_frame_free(&s->input_frames[i]);
237  }
238 
239  av_freep(&s->channels);
240  av_freep(&s->buffers);
241  av_freep(&s->input_frames);
242 }
243 
245 {
246  JoinContext *s = ctx->priv;
248  int i;
249 
252 
253  for (i = 0; i < ctx->nb_inputs; i++) {
254  layouts = ff_all_channel_layouts();
255  if (!layouts)
256  return AVERROR(ENOMEM);
258  }
259 
262 
263  return 0;
264 }
265 
267  uint64_t *inputs)
268 {
269  int i;
270 
271  for (i = 0; i < ctx->nb_inputs; i++) {
272  AVFilterLink *link = ctx->inputs[i];
273 
274  if (ch->out_channel & link->channel_layout &&
275  !(ch->out_channel & inputs[i])) {
276  ch->input = i;
277  ch->in_channel = ch->out_channel;
278  inputs[i] |= ch->out_channel;
279  return;
280  }
281  }
282 }
283 
285  uint64_t *inputs)
286 {
287  int i;
288 
289  for (i = 0; i < ctx->nb_inputs; i++) {
290  AVFilterLink *link = ctx->inputs[i];
291 
292  if ((inputs[i] & link->channel_layout) != link->channel_layout) {
293  uint64_t unused = link->channel_layout & ~inputs[i];
294 
295  ch->input = i;
297  inputs[i] |= ch->in_channel;
298  return;
299  }
300  }
301 }
302 
303 static int join_config_output(AVFilterLink *outlink)
304 {
305  AVFilterContext *ctx = outlink->src;
306  JoinContext *s = ctx->priv;
307  uint64_t *inputs; // nth element tracks which channels are used from nth input
308  int i, ret = 0;
309 
310  /* initialize inputs to user-specified mappings */
311  if (!(inputs = av_mallocz_array(ctx->nb_inputs, sizeof(*inputs))))
312  return AVERROR(ENOMEM);
313  for (i = 0; i < s->nb_channels; i++) {
314  ChannelMap *ch = &s->channels[i];
315  AVFilterLink *inlink;
316 
317  if (ch->input < 0)
318  continue;
319 
320  inlink = ctx->inputs[ch->input];
321 
322  if (!ch->in_channel)
324  ch->in_channel_idx);
325 
326  if (!(ch->in_channel & inlink->channel_layout)) {
327  av_log(ctx, AV_LOG_ERROR, "Requested channel %s is not present in "
328  "input stream #%d.\n", av_get_channel_name(ch->in_channel),
329  ch->input);
330  ret = AVERROR(EINVAL);
331  goto fail;
332  }
333 
334  inputs[ch->input] |= ch->in_channel;
335  }
336 
337  /* guess channel maps when not explicitly defined */
338  /* first try unused matching channels */
339  for (i = 0; i < s->nb_channels; i++) {
340  ChannelMap *ch = &s->channels[i];
341 
342  if (ch->input < 0)
343  guess_map_matching(ctx, ch, inputs);
344  }
345 
346  /* if the above failed, try to find _any_ unused input channel */
347  for (i = 0; i < s->nb_channels; i++) {
348  ChannelMap *ch = &s->channels[i];
349 
350  if (ch->input < 0)
351  guess_map_any(ctx, ch, inputs);
352 
353  if (ch->input < 0) {
354  av_log(ctx, AV_LOG_ERROR, "Could not find input channel for "
355  "output channel '%s'.\n",
357  goto fail;
358  }
359 
361  ch->in_channel);
362  }
363 
364  /* print mappings */
365  av_log(ctx, AV_LOG_VERBOSE, "mappings: ");
366  for (i = 0; i < s->nb_channels; i++) {
367  ChannelMap *ch = &s->channels[i];
368  av_log(ctx, AV_LOG_VERBOSE, "%d.%s => %s ", ch->input,
371  }
372  av_log(ctx, AV_LOG_VERBOSE, "\n");
373 
374  for (i = 0; i < ctx->nb_inputs; i++) {
375  if (!inputs[i])
376  av_log(ctx, AV_LOG_WARNING, "No channels are used from input "
377  "stream %d.\n", i);
378  }
379 
380 fail:
381  av_freep(&inputs);
382  return ret;
383 }
384 
385 static int join_request_frame(AVFilterLink *outlink)
386 {
387  AVFilterContext *ctx = outlink->src;
388  JoinContext *s = ctx->priv;
389  AVFrame *frame;
390  int linesize = INT_MAX;
391  int nb_samples = 0;
392  int nb_buffers = 0;
393  int i, j, ret;
394 
395  /* get a frame on each input */
396  for (i = 0; i < ctx->nb_inputs; i++) {
397  AVFilterLink *inlink = ctx->inputs[i];
398 
399  if (!s->input_frames[i] &&
400  (ret = ff_request_frame(inlink)) < 0)
401  return ret;
402 
403  /* request the same number of samples on all inputs */
404  if (i == 0) {
405  nb_samples = s->input_frames[0]->nb_samples;
406 
407  for (j = 1; !i && j < ctx->nb_inputs; j++)
408  ctx->inputs[j]->request_samples = nb_samples;
409  }
410  }
411 
412  /* setup the output frame */
413  frame = av_frame_alloc();
414  if (!frame)
415  return AVERROR(ENOMEM);
416  if (s->nb_channels > FF_ARRAY_ELEMS(frame->data)) {
418  sizeof(*frame->extended_data));
419  if (!frame->extended_data) {
420  ret = AVERROR(ENOMEM);
421  goto fail;
422  }
423  }
424 
425  /* copy the data pointers */
426  for (i = 0; i < s->nb_channels; i++) {
427  ChannelMap *ch = &s->channels[i];
428  AVFrame *cur = s->input_frames[ch->input];
429  AVBufferRef *buf;
430 
431  frame->extended_data[i] = cur->extended_data[ch->in_channel_idx];
432  linesize = FFMIN(linesize, cur->linesize[0]);
433 
434  /* add the buffer where this plan is stored to the list if it's
435  * not already there */
437  if (!buf) {
438  ret = AVERROR(EINVAL);
439  goto fail;
440  }
441  for (j = 0; j < nb_buffers; j++)
442  if (s->buffers[j]->buffer == buf->buffer)
443  break;
444  if (j == i)
445  s->buffers[nb_buffers++] = buf;
446  }
447 
448  /* create references to the buffers we copied to output */
449  if (nb_buffers > FF_ARRAY_ELEMS(frame->buf)) {
450  frame->nb_extended_buf = nb_buffers - FF_ARRAY_ELEMS(frame->buf);
452  sizeof(*frame->extended_buf));
453  if (!frame->extended_buf) {
454  frame->nb_extended_buf = 0;
455  ret = AVERROR(ENOMEM);
456  goto fail;
457  }
458  }
459  for (i = 0; i < FFMIN(FF_ARRAY_ELEMS(frame->buf), nb_buffers); i++) {
460  frame->buf[i] = av_buffer_ref(s->buffers[i]);
461  if (!frame->buf[i]) {
462  ret = AVERROR(ENOMEM);
463  goto fail;
464  }
465  }
466  for (i = 0; i < frame->nb_extended_buf; i++) {
467  frame->extended_buf[i] = av_buffer_ref(s->buffers[i +
468  FF_ARRAY_ELEMS(frame->buf)]);
469  if (!frame->extended_buf[i]) {
470  ret = AVERROR(ENOMEM);
471  goto fail;
472  }
473  }
474 
475  frame->nb_samples = nb_samples;
476  frame->channel_layout = outlink->channel_layout;
477  av_frame_set_channels(frame, outlink->channels);
478  frame->sample_rate = outlink->sample_rate;
479  frame->format = outlink->format;
480  frame->pts = s->input_frames[0]->pts;
481  frame->linesize[0] = linesize;
482  if (frame->data != frame->extended_data) {
483  memcpy(frame->data, frame->extended_data, sizeof(*frame->data) *
484  FFMIN(FF_ARRAY_ELEMS(frame->data), s->nb_channels));
485  }
486 
487  ret = ff_filter_frame(outlink, frame);
488 
489  for (i = 0; i < ctx->nb_inputs; i++)
490  av_frame_free(&s->input_frames[i]);
491 
492  return ret;
493 
494 fail:
495  av_frame_free(&frame);
496  return ret;
497 }
498 
500  {
501  .name = "default",
502  .type = AVMEDIA_TYPE_AUDIO,
503  .config_props = join_config_output,
504  .request_frame = join_request_frame,
505  },
506  { NULL }
507 };
508 
510  .name = "join",
511  .description = NULL_IF_CONFIG_SMALL("Join multiple audio streams into "
512  "multi-channel output."),
513  .priv_size = sizeof(JoinContext),
514  .priv_class = &join_class,
515  .init = join_init,
516  .uninit = join_uninit,
518  .inputs = NULL,
519  .outputs = avfilter_af_join_outputs,
521 };
void av_frame_set_channels(AVFrame *frame, int val)
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
uint64_t in_channel
layout describing the input channel
Definition: af_channelmap.c:41
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
AVOption.
Definition: opt.h:255
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
static const AVFilterPad outputs[]
Definition: af_ashowinfo.c:248
Main libavfilter public API header.
#define A
Definition: af_join.c:67
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:441
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
#define AVFILTER_FLAG_DYNAMIC_INPUTS
The number of the filter inputs is not determined just by AVFilter.inputs.
Definition: avfilter.h:431
int nb_extended_buf
Number of elements in extended_buf.
Definition: frame.h:459
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:72
#define FF_ARRAY_ELEMS(a)
AVBufferRef ** buffers
Temporary storage for buffer references, for assembling the output frame.
Definition: af_join.c:63
char * map
Definition: af_join.c:48
int av_get_channel_layout_nb_channels(uint64_t channel_layout)
Return the number of channels in the channel layout.
const char * name
Pad name.
Definition: internal.h:67
int nb_channels
Definition: af_join.c:52
uint64_t av_get_channel_layout(const char *name)
Return a channel layout id that matches name, or 0 if no match is found.
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:641
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
int ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
Add *ref as a new reference to f.
Definition: formats.c:417
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1145
#define av_cold
Definition: attributes.h:74
static av_cold void join_uninit(AVFilterContext *ctx)
Definition: af_join.c:229
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:135
static av_cold int uninit(AVCodecContext *avctx)
Definition: crystalhd.c:337
AVOptions.
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:257
static av_cold int join_init(AVFilterContext *ctx)
Definition: af_join.c:184
static AVFrame * frame
static void guess_map_matching(AVFilterContext *ctx, ChannelMap *ch, uint64_t *inputs)
Definition: af_join.c:266
int input
input stream index
Definition: af_join.c:38
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
#define av_log(a,...)
static int join_query_formats(AVFilterContext *ctx)
Definition: af_join.c:244
A filter pad used for either input or output.
Definition: internal.h:61
AVFilterPad * input_pads
array of input pads
Definition: avfilter.h:640
#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:542
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
Definition: formats.c:329
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:148
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
void * priv
private data for use by the filter
Definition: avfilter.h:654
int(* filter_frame)(AVFilterLink *link, AVFrame *frame)
Filtering callback.
Definition: internal.h:100
simple assert() macros that are a bit more flexible than ISO C assert().
uint64_t channel_layout
Channel layout of the audio data.
Definition: frame.h:427
static const AVOption join_options[]
Definition: af_join.c:69
audio channel layout utility functions
unsigned nb_inputs
number of input pads
Definition: avfilter.h:645
#define FFMIN(a, b)
Definition: common.h:66
AVBufferRef ** extended_buf
For planar audio which requires more than AV_NUM_DATA_POINTERS AVBufferRef pointers, this array will hold all the references which cannot fit into AVFrame.buf.
Definition: frame.h:455
ret
Definition: avfilter.c:974
AVBufferRef * av_frame_get_plane_buffer(AVFrame *frame, int plane)
Get the buffer reference a given data plane is stored in.
Definition: frame.c:553
AVFilterFormats * ff_planar_sample_fmts(void)
Construct a formats list containing all planar sample formats.
Definition: formats.c:367
AVFilter ff_af_join
Definition: af_join.c:509
AVFilterChannelLayouts * ff_all_channel_layouts(void)
Construct an empty AVFilterChannelLayouts/AVFilterFormats struct – representing any channel layout (w...
Definition: formats.c:385
static const AVFilterPad avfilter_af_join_outputs[]
Definition: af_join.c:499
int in_channel_idx
index of in_channel in the input stream data
Definition: af_channelmap.c:43
A list of supported channel layouts.
Definition: formats.h:85
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:232
AVFILTER_DEFINE_CLASS(join)
char * av_strdup(const char *s)
Duplicate the string s.
Definition: mem.c:265
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:199
int inputs
Definition: af_join.c:47
void * buf
Definition: avisynth_c.h:553
AVBuffer * buffer
Definition: buffer.h:82
Describe the class of an AVClass context structure.
Definition: log.h:67
int sample_rate
Sample rate of the audio data.
Definition: frame.h:422
#define PARSE_CHANNEL(str, var, inout)
Filter definition.
Definition: avfilter.h:470
static const AVFilterPad inputs[]
Definition: af_ashowinfo.c:239
uint64_t out_channel
layout describing the output channel
Definition: af_channelmap.c:42
const char * name
Filter name.
Definition: avfilter.h:474
#define snprintf
Definition: snprintf.h:34
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:648
enum MovChannelLayoutTag * layouts
Definition: mov_chan.c:434
int av_get_channel_layout_channel_index(uint64_t channel_layout, uint64_t channel)
Get the index of a channel in channel_layout.
AVFilterFormats * ff_all_samplerates(void)
Definition: formats.c:379
static int flags
Definition: cpu.c:47
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:182
AVFrame ** input_frames
Temporary storage for input frames, until we get one on each input.
Definition: af_join.c:58
ChannelMap * channels
Definition: af_join.c:53
#define F
Definition: af_join.c:68
A reference to a data buffer.
Definition: buffer.h:81
#define OFFSET(x)
Definition: af_join.c:66
static int query_formats(AVFilterContext *ctx)
Definition: aeval.c:244
static void guess_map_any(AVFilterContext *ctx, ChannelMap *ch, uint64_t *inputs)
Definition: af_join.c:284
common internal and external API header
uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index)
Get the channel with the given index in channel_layout.
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:92
static int parse_maps(AVFilterContext *ctx)
Definition: af_join.c:97
static int join_request_frame(AVFilterLink *outlink)
Definition: af_join.c:385
char * channel_layout_str
Definition: af_join.c:49
const char * av_get_channel_name(uint64_t channel)
Get the name of a given channel.
An instance of a filter.
Definition: avfilter.h:633
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:228
#define av_freep(p)
static int join_config_output(AVFilterLink *outlink)
Definition: af_join.c:303
int needs_fifo
The filter expects a fifo to be inserted on its input link, typically because it has a delay...
Definition: internal.h:144
int ff_request_frame(AVFilterLink *link)
Request an input frame from the filter at the other end of the link.
Definition: avfilter.c:343
static int filter_frame(AVFilterLink *link, AVFrame *frame)
Definition: af_join.c:81
internal API functions
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:215
uint64_t channel_layout
Definition: af_join.c:50
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:225
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:530
const char * name
Definition: opengl_enc.c:103
static int ff_insert_inpad(AVFilterContext *f, unsigned index, AVFilterPad *p)
Insert a new input pad for the filter.
Definition: internal.h:269