FFmpeg  4.4.6
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"
28 #include "libavutil/avstring.h"
30 #include "libavutil/common.h"
31 #include "libavutil/opt.h"
32 
33 #include "audio.h"
34 #include "avfilter.h"
35 #include "formats.h"
36 #include "filters.h"
37 #include "internal.h"
38 
39 typedef struct ChannelMap {
40  int input; ///< input stream index
41  int in_channel_idx; ///< index of in_channel in the input stream data
42  uint64_t in_channel; ///< layout describing the input channel
43  uint64_t out_channel; ///< layout describing the output channel
44 } ChannelMap;
45 
46 typedef struct JoinContext {
47  const AVClass *class;
48 
49  int inputs;
50  char *map;
52  uint64_t channel_layout;
53 
56 
57  /**
58  * Temporary storage for input frames, until we get one on each input.
59  */
61 
62  /**
63  * Temporary storage for buffer references, for assembling the output frame.
64  */
66 } JoinContext;
67 
68 #define OFFSET(x) offsetof(JoinContext, x)
69 #define A AV_OPT_FLAG_AUDIO_PARAM
70 #define F AV_OPT_FLAG_FILTERING_PARAM
71 static const AVOption join_options[] = {
72  { "inputs", "Number of input streams.", OFFSET(inputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, A|F },
73  { "channel_layout", "Channel layout of the "
74  "output stream.", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, A|F },
75  { "map", "A comma-separated list of channels maps in the format "
76  "'input_stream.input_channel-output_channel.",
77  OFFSET(map), AV_OPT_TYPE_STRING, .flags = A|F },
78  { NULL }
79 };
80 
82 
84 {
85  JoinContext *s = ctx->priv;
86  char separator = '|';
87  char *cur = s->map;
88 
89  while (cur && *cur) {
90  char *sep, *next, *p;
91  uint64_t in_channel = 0, out_channel = 0;
92  int input_idx, out_ch_idx, in_ch_idx;
93 
94  next = strchr(cur, separator);
95  if (next)
96  *next++ = 0;
97 
98  /* split the map into input and output parts */
99  if (!(sep = strchr(cur, '-'))) {
100  av_log(ctx, AV_LOG_ERROR, "Missing separator '-' in channel "
101  "map '%s'\n", cur);
102  return AVERROR(EINVAL);
103  }
104  *sep++ = 0;
105 
106 #define PARSE_CHANNEL(str, var, inout) \
107  if (!(var = av_get_channel_layout(str))) { \
108  av_log(ctx, AV_LOG_ERROR, "Invalid " inout " channel: %s.\n", str);\
109  return AVERROR(EINVAL); \
110  } \
111  if (av_get_channel_layout_nb_channels(var) != 1) { \
112  av_log(ctx, AV_LOG_ERROR, "Channel map describes more than one " \
113  inout " channel.\n"); \
114  return AVERROR(EINVAL); \
115  }
116 
117  /* parse output channel */
118  PARSE_CHANNEL(sep, out_channel, "output");
119  if (!(out_channel & s->channel_layout)) {
120  av_log(ctx, AV_LOG_ERROR, "Output channel '%s' is not present in "
121  "requested channel layout.\n", sep);
122  return AVERROR(EINVAL);
123  }
124 
125  out_ch_idx = av_get_channel_layout_channel_index(s->channel_layout,
126  out_channel);
127  if (s->channels[out_ch_idx].input >= 0) {
128  av_log(ctx, AV_LOG_ERROR, "Multiple maps for output channel "
129  "'%s'.\n", sep);
130  return AVERROR(EINVAL);
131  }
132 
133  /* parse input channel */
134  input_idx = strtol(cur, &cur, 0);
135  if (input_idx < 0 || input_idx >= s->inputs) {
136  av_log(ctx, AV_LOG_ERROR, "Invalid input stream index: %d.\n",
137  input_idx);
138  return AVERROR(EINVAL);
139  }
140 
141  if (*cur)
142  cur++;
143 
144  in_ch_idx = strtol(cur, &p, 0);
145  if (p == cur) {
146  /* channel specifier is not a number,
147  * try to parse as channel name */
148  PARSE_CHANNEL(cur, in_channel, "input");
149  }
150 
151  s->channels[out_ch_idx].input = input_idx;
152  if (in_channel)
153  s->channels[out_ch_idx].in_channel = in_channel;
154  else
155  s->channels[out_ch_idx].in_channel_idx = in_ch_idx;
156 
157  cur = next;
158  }
159  return 0;
160 }
161 
163 {
164  JoinContext *s = ctx->priv;
165  int ret, i;
166 
167  if (!(s->channel_layout = av_get_channel_layout(s->channel_layout_str))) {
168  av_log(ctx, AV_LOG_ERROR, "Error parsing channel layout '%s'.\n",
169  s->channel_layout_str);
170  return AVERROR(EINVAL);
171  }
172 
173  s->nb_channels = av_get_channel_layout_nb_channels(s->channel_layout);
174  s->channels = av_mallocz_array(s->nb_channels, sizeof(*s->channels));
175  s->buffers = av_mallocz_array(s->nb_channels, sizeof(*s->buffers));
176  s->input_frames = av_mallocz_array(s->inputs, sizeof(*s->input_frames));
177  if (!s->channels || !s->buffers|| !s->input_frames)
178  return AVERROR(ENOMEM);
179 
180  for (i = 0; i < s->nb_channels; i++) {
181  s->channels[i].out_channel = av_channel_layout_extract_channel(s->channel_layout, i);
182  s->channels[i].input = -1;
183  }
184 
185  if ((ret = parse_maps(ctx)) < 0)
186  return ret;
187 
188  for (i = 0; i < s->inputs; i++) {
189  AVFilterPad pad = { 0 };
190 
191  pad.type = AVMEDIA_TYPE_AUDIO;
192  pad.name = av_asprintf("input%d", i);
193  if (!pad.name)
194  return AVERROR(ENOMEM);
195 
196  if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
197  av_freep(&pad.name);
198  return ret;
199  }
200  }
201 
202  return 0;
203 }
204 
206 {
207  JoinContext *s = ctx->priv;
208  int i;
209 
210  for (i = 0; i < s->inputs && s->input_frames; i++) {
211  av_frame_free(&s->input_frames[i]);
212  }
213 
214  for (i = 0; i < ctx->nb_inputs; i++) {
215  av_freep(&ctx->input_pads[i].name);
216  }
217 
218  av_freep(&s->channels);
219  av_freep(&s->buffers);
220  av_freep(&s->input_frames);
221 }
222 
224 {
225  JoinContext *s = ctx->priv;
227  int i, ret;
228 
229  if ((ret = ff_add_channel_layout(&layouts, s->channel_layout)) < 0 ||
230  (ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->incfg.channel_layouts)) < 0)
231  return ret;
232 
233  for (i = 0; i < ctx->nb_inputs; i++) {
235  if ((ret = ff_channel_layouts_ref(layouts, &ctx->inputs[i]->outcfg.channel_layouts)) < 0)
236  return ret;
237  }
238 
239  if ((ret = ff_set_common_formats(ctx, ff_planar_sample_fmts())) < 0 ||
241  return ret;
242 
243  return 0;
244 }
245 
247  uint64_t *inputs)
248 {
249  int i;
250 
251  for (i = 0; i < ctx->nb_inputs; i++) {
252  AVFilterLink *link = ctx->inputs[i];
253 
254  if (ch->out_channel & link->channel_layout &&
255  !(ch->out_channel & inputs[i])) {
256  ch->input = i;
257  ch->in_channel = ch->out_channel;
258  inputs[i] |= ch->out_channel;
259  return;
260  }
261  }
262 }
263 
265  uint64_t *inputs)
266 {
267  int i;
268 
269  for (i = 0; i < ctx->nb_inputs; i++) {
270  AVFilterLink *link = ctx->inputs[i];
271 
272  if ((inputs[i] & link->channel_layout) != link->channel_layout) {
273  uint64_t unused = link->channel_layout & ~inputs[i];
274 
275  ch->input = i;
277  inputs[i] |= ch->in_channel;
278  return;
279  }
280  }
281 }
282 
283 static int join_config_output(AVFilterLink *outlink)
284 {
285  AVFilterContext *ctx = outlink->src;
286  JoinContext *s = ctx->priv;
287  uint64_t *inputs; // nth element tracks which channels are used from nth input
288  int i, ret = 0;
289 
290  /* initialize inputs to user-specified mappings */
291  if (!(inputs = av_mallocz_array(ctx->nb_inputs, sizeof(*inputs))))
292  return AVERROR(ENOMEM);
293  for (i = 0; i < s->nb_channels; i++) {
294  ChannelMap *ch = &s->channels[i];
295  AVFilterLink *inlink;
296 
297  if (ch->input < 0)
298  continue;
299 
300  inlink = ctx->inputs[ch->input];
301 
302  if (!ch->in_channel)
304  ch->in_channel_idx);
305 
306  if (!(ch->in_channel & inlink->channel_layout)) {
307  av_log(ctx, AV_LOG_ERROR, "Requested channel %s is not present in "
308  "input stream #%d.\n", av_get_channel_name(ch->in_channel),
309  ch->input);
310  ret = AVERROR(EINVAL);
311  goto fail;
312  }
313 
314  inputs[ch->input] |= ch->in_channel;
315  }
316 
317  /* guess channel maps when not explicitly defined */
318  /* first try unused matching channels */
319  for (i = 0; i < s->nb_channels; i++) {
320  ChannelMap *ch = &s->channels[i];
321 
322  if (ch->input < 0)
324  }
325 
326  /* if the above failed, try to find _any_ unused input channel */
327  for (i = 0; i < s->nb_channels; i++) {
328  ChannelMap *ch = &s->channels[i];
329 
330  if (ch->input < 0)
331  guess_map_any(ctx, ch, inputs);
332 
333  if (ch->input < 0) {
334  av_log(ctx, AV_LOG_ERROR, "Could not find input channel for "
335  "output channel '%s'.\n",
337  goto fail;
338  }
339 
340  ch->in_channel_idx = av_get_channel_layout_channel_index(ctx->inputs[ch->input]->channel_layout,
341  ch->in_channel);
342  }
343 
344  /* print mappings */
345  av_log(ctx, AV_LOG_VERBOSE, "mappings: ");
346  for (i = 0; i < s->nb_channels; i++) {
347  ChannelMap *ch = &s->channels[i];
348  av_log(ctx, AV_LOG_VERBOSE, "%d.%s => %s ", ch->input,
351  }
352  av_log(ctx, AV_LOG_VERBOSE, "\n");
353 
354  for (i = 0; i < ctx->nb_inputs; i++) {
355  if (!inputs[i])
356  av_log(ctx, AV_LOG_WARNING, "No channels are used from input "
357  "stream %d.\n", i);
358  }
359 
360 fail:
361  av_freep(&inputs);
362  return ret;
363 }
364 
366 {
367  AVFilterLink *outlink = ctx->outputs[0];
368  JoinContext *s = ctx->priv;
369  AVFrame *frame;
370  int linesize = INT_MAX;
371  int nb_samples = INT_MAX;
372  int nb_buffers = 0;
373  int i, j, ret;
374 
375  for (i = 0; i < ctx->nb_inputs; i++) {
376  if (!s->input_frames[i])
377  return 0;
378  nb_samples = FFMIN(nb_samples, s->input_frames[i]->nb_samples);
379  }
380  if (!nb_samples)
381  return 0;
382 
383  /* setup the output frame */
384  frame = av_frame_alloc();
385  if (!frame)
386  return AVERROR(ENOMEM);
387  if (s->nb_channels > FF_ARRAY_ELEMS(frame->data)) {
388  frame->extended_data = av_mallocz_array(s->nb_channels,
389  sizeof(*frame->extended_data));
390  if (!frame->extended_data) {
391  ret = AVERROR(ENOMEM);
392  goto fail;
393  }
394  }
395 
396  /* copy the data pointers */
397  for (i = 0; i < s->nb_channels; i++) {
398  ChannelMap *ch = &s->channels[i];
399  AVFrame *cur = s->input_frames[ch->input];
400  AVBufferRef *buf;
401 
403  linesize = FFMIN(linesize, cur->linesize[0]);
404 
405  /* add the buffer where this plan is stored to the list if it's
406  * not already there */
408  if (!buf) {
409  ret = AVERROR(EINVAL);
410  goto fail;
411  }
412  for (j = 0; j < nb_buffers; j++)
413  if (s->buffers[j]->buffer == buf->buffer)
414  break;
415  if (j == i)
416  s->buffers[nb_buffers++] = buf;
417  }
418 
419  /* create references to the buffers we copied to output */
420  if (nb_buffers > FF_ARRAY_ELEMS(frame->buf)) {
421  frame->nb_extended_buf = nb_buffers - FF_ARRAY_ELEMS(frame->buf);
423  sizeof(*frame->extended_buf));
424  if (!frame->extended_buf) {
425  frame->nb_extended_buf = 0;
426  ret = AVERROR(ENOMEM);
427  goto fail;
428  }
429  }
430  for (i = 0; i < FFMIN(FF_ARRAY_ELEMS(frame->buf), nb_buffers); i++) {
431  frame->buf[i] = av_buffer_ref(s->buffers[i]);
432  if (!frame->buf[i]) {
433  ret = AVERROR(ENOMEM);
434  goto fail;
435  }
436  }
437  for (i = 0; i < frame->nb_extended_buf; i++) {
438  frame->extended_buf[i] = av_buffer_ref(s->buffers[i +
440  if (!frame->extended_buf[i]) {
441  ret = AVERROR(ENOMEM);
442  goto fail;
443  }
444  }
445 
446  frame->nb_samples = nb_samples;
447  frame->channel_layout = outlink->channel_layout;
448  frame->channels = outlink->channels;
449  frame->sample_rate = outlink->sample_rate;
450  frame->format = outlink->format;
451  frame->pts = s->input_frames[0]->pts;
452  frame->linesize[0] = linesize;
453  if (frame->data != frame->extended_data) {
454  memcpy(frame->data, frame->extended_data, sizeof(*frame->data) *
455  FFMIN(FF_ARRAY_ELEMS(frame->data), s->nb_channels));
456  }
457 
458  ret = ff_filter_frame(outlink, frame);
459 
460  for (i = 0; i < ctx->nb_inputs; i++)
461  av_frame_free(&s->input_frames[i]);
462 
463  return ret;
464 
465 fail:
467  return ret;
468 }
469 
471 {
472  JoinContext *s = ctx->priv;
473  int i, ret, status;
474  int nb_samples = 0;
475  int64_t pts;
476 
478 
479  if (!s->input_frames[0]) {
480  ret = ff_inlink_consume_frame(ctx->inputs[0], &s->input_frames[0]);
481  if (ret < 0) {
482  return ret;
483  } else if (ff_inlink_acknowledge_status(ctx->inputs[0], &status, &pts)) {
484  ff_outlink_set_status(ctx->outputs[0], status, pts);
485  return 0;
486  } else {
487  if (ff_outlink_frame_wanted(ctx->outputs[0]) && !s->input_frames[0]) {
488  ff_inlink_request_frame(ctx->inputs[0]);
489  return 0;
490  }
491  }
492  if (!s->input_frames[0]) {
493  return 0;
494  }
495  }
496 
497  nb_samples = s->input_frames[0]->nb_samples;
498 
499  for (i = 1; i < ctx->nb_inputs && nb_samples > 0; i++) {
500  if (s->input_frames[i])
501  continue;
502 
503  if (ff_inlink_check_available_samples(ctx->inputs[i], nb_samples) > 0) {
504  ret = ff_inlink_consume_samples(ctx->inputs[i], nb_samples, nb_samples, &s->input_frames[i]);
505  if (ret < 0) {
506  return ret;
507  } else if (ff_inlink_acknowledge_status(ctx->inputs[i], &status, &pts)) {
508  ff_outlink_set_status(ctx->outputs[0], status, pts);
509  return 0;
510  }
511  } else {
512  if (ff_outlink_frame_wanted(ctx->outputs[0])) {
513  ff_inlink_request_frame(ctx->inputs[i]);
514  return 0;
515  }
516  }
517  }
518 
519  return try_push_frame(ctx);
520 }
521 
523  {
524  .name = "default",
525  .type = AVMEDIA_TYPE_AUDIO,
526  .config_props = join_config_output,
527  },
528  { NULL }
529 };
530 
532  .name = "join",
533  .description = NULL_IF_CONFIG_SMALL("Join multiple audio streams into "
534  "multi-channel output."),
535  .priv_size = sizeof(JoinContext),
536  .priv_class = &join_class,
537  .init = join_init,
538  .uninit = join_uninit,
539  .activate = activate,
541  .inputs = NULL,
544 };
static int query_formats(AVFilterContext *ctx)
Definition: aeval.c:243
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
static int parse_maps(AVFilterContext *ctx)
Definition: af_join.c:83
#define F
Definition: af_join.c:70
AVFilter ff_af_join
Definition: af_join.c:531
static int join_config_output(AVFilterLink *outlink)
Definition: af_join.c:283
static const AVOption join_options[]
Definition: af_join.c:71
static void guess_map_any(AVFilterContext *ctx, ChannelMap *ch, uint64_t *inputs)
Definition: af_join.c:264
static av_cold void join_uninit(AVFilterContext *ctx)
Definition: af_join.c:205
#define PARSE_CHANNEL(str, var, inout)
#define A
Definition: af_join.c:69
AVFILTER_DEFINE_CLASS(join)
static const AVFilterPad avfilter_af_join_outputs[]
Definition: af_join.c:522
static int activate(AVFilterContext *ctx)
Definition: af_join.c:470
#define OFFSET(x)
Definition: af_join.c:68
static int join_query_formats(AVFilterContext *ctx)
Definition: af_join.c:223
static int try_push_frame(AVFilterContext *ctx)
Definition: af_join.c:365
static void guess_map_matching(AVFilterContext *ctx, ChannelMap *ch, uint64_t *inputs)
Definition: af_join.c:246
static av_cold int join_init(AVFilterContext *ctx)
Definition: af_join.c:162
#define av_cold
Definition: attributes.h:88
simple assert() macros that are a bit more flexible than ISO C assert().
int ff_inlink_acknowledge_status(AVFilterLink *link, int *rstatus, int64_t *rpts)
Test and acknowledge the change of status on the link.
Definition: avfilter.c:1449
int ff_inlink_check_available_samples(AVFilterLink *link, unsigned min)
Test if enough samples are available on the link.
Definition: avfilter.c:1479
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1096
int ff_inlink_consume_samples(AVFilterLink *link, unsigned min, unsigned max, AVFrame **rframe)
Take samples from the link's FIFO and update the link's stats.
Definition: avfilter.c:1513
int ff_inlink_consume_frame(AVFilterLink *link, AVFrame **rframe)
Take a frame from the link's FIFO and update the link's stats.
Definition: avfilter.c:1494
void ff_inlink_request_frame(AVFilterLink *link)
Mark that a frame is wanted on the link.
Definition: avfilter.c:1620
Main libavfilter public API header.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
char * av_asprintf(const char *fmt,...)
Definition: avstring.c:113
#define flags(name, subs,...)
Definition: cbs_av1.c:572
#define s(width, name)
Definition: cbs_vp9.c:257
audio channel layout utility functions
#define fail()
Definition: checkasm.h:133
common internal and external API header
#define FFMIN(a, b)
Definition: common.h:105
#define NULL
Definition: coverity.c:32
long long int64_t
Definition: coverity.c:34
static av_cold int uninit(AVCodecContext *avctx)
Definition: crystalhd.c:279
static AVFrame * frame
static void ff_outlink_set_status(AVFilterLink *link, int status, int64_t pts)
Set the status field of a link from the source filter.
Definition: filters.h:189
#define FF_FILTER_FORWARD_STATUS_BACK_ALL(outlink, filter)
Forward the status on an output link to all input links.
Definition: filters.h:212
static int ff_outlink_frame_wanted(AVFilterLink *link)
Test if a frame is wanted on an output link.
Definition: filters.h:172
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
Definition: formats.c:338
AVFilterFormats * ff_planar_sample_fmts(void)
Construct a formats list containing all planar sample formats.
Definition: formats.c:408
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:587
AVFilterChannelLayouts * ff_all_channel_layouts(void)
Construct an empty AVFilterChannelLayouts/AVFilterFormats struct – representing any channel layout (w...
Definition: formats.c:427
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:575
int ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
Add *ref as a new reference to f.
Definition: formats.c:461
AVFilterFormats * ff_all_samplerates(void)
Definition: formats.c:421
@ AV_OPT_TYPE_INT
Definition: opt.h:225
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
int av_get_channel_layout_channel_index(uint64_t channel_layout, uint64_t channel)
Get the index of a channel in channel_layout.
uint64_t av_get_channel_layout(const char *name)
Return a channel layout id that matches name, or 0 if no match is found.
int av_get_channel_layout_nb_channels(uint64_t channel_layout)
Return the number of channels in the channel layout.
uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index)
Get the channel with the given index in channel_layout.
const char * av_get_channel_name(uint64_t channel)
Get the name of a given channel.
#define AVFILTER_FLAG_DYNAMIC_INPUTS
The number of the filter inputs is not determined just by AVFilter.inputs.
Definition: avfilter.h:106
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:93
#define AVERROR(e)
Definition: error.h:43
AVBufferRef * av_frame_get_plane_buffer(AVFrame *frame, int plane)
Get the buffer reference a given data plane is stored in.
Definition: frame.c:663
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:210
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
void * av_mallocz_array(size_t nmemb, size_t size)
Allocate a memory block for an array with av_mallocz().
Definition: mem.c:190
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
const VDPAUPixFmtMap * map
int i
Definition: input.c:407
static int ff_insert_inpad(AVFilterContext *f, unsigned index, AVFilterPad *p)
Insert a new input pad for the filter.
Definition: internal.h:240
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
enum MovChannelLayoutTag * layouts
Definition: mov_chan.c:434
AVOptions.
#define FF_ARRAY_ELEMS(a)
A reference to a data buffer.
Definition: buffer.h:84
AVBuffer * buffer
Definition: buffer.h:85
Describe the class of an AVClass context structure.
Definition: log.h:67
A list of supported channel layouts.
Definition: formats.h:86
An instance of a filter.
Definition: avfilter.h:341
A filter pad used for either input or output.
Definition: internal.h:54
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:65
const char * name
Pad name.
Definition: internal.h:60
Filter definition.
Definition: avfilter.h:145
const char * name
Filter name.
Definition: avfilter.h:149
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:384
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:411
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:332
AVBufferRef ** extended_buf
For planar audio which requires more than AV_NUM_DATA_POINTERS AVBufferRef pointers,...
Definition: frame.h:523
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:509
int channels
number of audio channels, only used for audio.
Definition: frame.h:624
uint64_t channel_layout
Channel layout of the audio data.
Definition: frame.h:495
int nb_extended_buf
Number of elements in extended_buf.
Definition: frame.h:527
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:349
int sample_rate
Sample rate of the audio data.
Definition: frame.h:490
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
Definition: frame.h:391
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:365
AVOption.
Definition: opt.h:248
uint64_t out_channel
layout describing the output channel
Definition: af_channelmap.c:42
int in_channel_idx
index of in_channel in the input stream data
Definition: af_channelmap.c:43
uint64_t in_channel
layout describing the input channel
Definition: af_channelmap.c:41
int input
input stream index
Definition: af_join.c:40
AVBufferRef ** buffers
Temporary storage for buffer references, for assembling the output frame.
Definition: af_join.c:65
char * channel_layout_str
Definition: af_join.c:51
AVFrame ** input_frames
Temporary storage for input frames, until we get one on each input.
Definition: af_join.c:60
int nb_channels
Definition: af_join.c:54
ChannelMap * channels
Definition: af_join.c:55
uint64_t channel_layout
Definition: af_join.c:52
char * map
Definition: af_join.c:50
int inputs
Definition: af_join.c:49
#define av_freep(p)
#define av_log(a,...)
AVFormatContext * ctx
Definition: movenc.c:48
static int64_t pts