FFmpeg  4.3.9
graphparser.c
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1 /*
2  * filter graph parser
3  * Copyright (c) 2008 Vitor Sessak
4  * Copyright (c) 2007 Bobby Bingham
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include <string.h>
24 #include <stdio.h>
25 
26 #include "libavutil/avstring.h"
27 #include "libavutil/mem.h"
28 #include "avfilter.h"
29 
30 #define WHITESPACES " \n\t\r"
31 
32 /**
33  * Link two filters together.
34  *
35  * @see avfilter_link()
36  */
37 static int link_filter(AVFilterContext *src, int srcpad,
38  AVFilterContext *dst, int dstpad,
39  void *log_ctx)
40 {
41  int ret;
42  if ((ret = avfilter_link(src, srcpad, dst, dstpad))) {
43  av_log(log_ctx, AV_LOG_ERROR,
44  "Cannot create the link %s:%d -> %s:%d\n",
45  src->filter->name, srcpad, dst->filter->name, dstpad);
46  return ret;
47  }
48 
49  return 0;
50 }
51 
52 /**
53  * Parse the name of a link, which has the format "[linkname]".
54  *
55  * @return a pointer (that need to be freed after use) to the name
56  * between parenthesis
57  */
58 static char *parse_link_name(const char **buf, void *log_ctx)
59 {
60  const char *start = *buf;
61  char *name;
62  (*buf)++;
63 
64  name = av_get_token(buf, "]");
65  if (!name)
66  return NULL;
67 
68  if (!name[0]) {
69  av_log(log_ctx, AV_LOG_ERROR,
70  "Bad (empty?) label found in the following: \"%s\".\n", start);
71  goto fail;
72  }
73 
74  if (**buf != ']') {
75  av_log(log_ctx, AV_LOG_ERROR,
76  "Mismatched '[' found in the following: \"%s\".\n", start);
77  fail:
78  av_freep(&name);
79  return NULL;
80  }
81  (*buf)++;
82 
83  return name;
84 }
85 
86 /**
87  * Create an instance of a filter, initialize and insert it in the
88  * filtergraph in *ctx.
89  *
90  * @param filt_ctx put here a filter context in case of successful creation and configuration, NULL otherwise.
91  * @param ctx the filtergraph context
92  * @param index an index which is supposed to be unique for each filter instance added to the filtergraph
93  * @param name the name of the filter to create, can be filter name or filter_name\@id as instance name
94  * @param args the arguments provided to the filter during its initialization
95  * @param log_ctx the log context to use
96  * @return >= 0 in case of success, a negative AVERROR code otherwise
97  */
98 static int create_filter(AVFilterContext **filt_ctx, AVFilterGraph *ctx, int index,
99  const char *name, const char *args, void *log_ctx)
100 {
101  const AVFilter *filt;
102  char name2[30];
103  const char *inst_name = NULL, *filt_name = NULL;
104  char *tmp_args = NULL;
105  int ret, k;
106 
107  av_strlcpy(name2, name, sizeof(name2));
108 
109  for (k = 0; name2[k]; k++) {
110  if (name2[k] == '@' && name[k+1]) {
111  name2[k] = 0;
112  inst_name = name;
113  filt_name = name2;
114  break;
115  }
116  }
117 
118  if (!inst_name) {
119  snprintf(name2, sizeof(name2), "Parsed_%s_%d", name, index);
120  inst_name = name2;
121  filt_name = name;
122  }
123 
124  filt = avfilter_get_by_name(filt_name);
125 
126  if (!filt) {
127  av_log(log_ctx, AV_LOG_ERROR,
128  "No such filter: '%s'\n", filt_name);
129  return AVERROR(EINVAL);
130  }
131 
132  *filt_ctx = avfilter_graph_alloc_filter(ctx, filt, inst_name);
133  if (!*filt_ctx) {
134  av_log(log_ctx, AV_LOG_ERROR,
135  "Error creating filter '%s'\n", filt_name);
136  return AVERROR(ENOMEM);
137  }
138 
139  if (!strcmp(filt_name, "scale") && (!args || !strstr(args, "flags")) &&
140  ctx->scale_sws_opts) {
141  if (args) {
142  tmp_args = av_asprintf("%s:%s",
143  args, ctx->scale_sws_opts);
144  if (!tmp_args)
145  return AVERROR(ENOMEM);
146  args = tmp_args;
147  } else
148  args = ctx->scale_sws_opts;
149  }
150 
151  ret = avfilter_init_str(*filt_ctx, args);
152  if (ret < 0) {
153  av_log(log_ctx, AV_LOG_ERROR,
154  "Error initializing filter '%s'", filt_name);
155  if (args)
156  av_log(log_ctx, AV_LOG_ERROR, " with args '%s'", args);
157  av_log(log_ctx, AV_LOG_ERROR, "\n");
158  avfilter_free(*filt_ctx);
159  *filt_ctx = NULL;
160  }
161 
162  av_free(tmp_args);
163  return ret;
164 }
165 
166 /**
167  * Parse a string of the form FILTER_NAME[=PARAMS], and create a
168  * corresponding filter instance which is added to graph with
169  * create_filter().
170  *
171  * @param filt_ctx Pointer that is set to the created and configured filter
172  * context on success, set to NULL on failure.
173  * @param filt_ctx put here a pointer to the created filter context on
174  * success, NULL otherwise
175  * @param buf pointer to the buffer to parse, *buf will be updated to
176  * point to the char next after the parsed string
177  * @param index an index which is assigned to the created filter
178  * instance, and which is supposed to be unique for each filter
179  * instance added to the filtergraph
180  * @return >= 0 in case of success, a negative AVERROR code otherwise
181  */
182 static int parse_filter(AVFilterContext **filt_ctx, const char **buf, AVFilterGraph *graph,
183  int index, void *log_ctx)
184 {
185  char *opts = NULL;
186  char *name = av_get_token(buf, "=,;[");
187  int ret;
188 
189  if (!name)
190  return AVERROR(ENOMEM);
191 
192  if (**buf == '=') {
193  (*buf)++;
194  opts = av_get_token(buf, "[],;");
195  if (!opts) {
196  av_free(name);
197  return AVERROR(ENOMEM);
198  }
199  }
200 
201  ret = create_filter(filt_ctx, graph, index, name, opts, log_ctx);
202  av_free(name);
203  av_free(opts);
204  return ret;
205 }
206 
208 {
209  return av_mallocz(sizeof(AVFilterInOut));
210 }
211 
213 {
214  while (*inout) {
215  AVFilterInOut *next = (*inout)->next;
216  av_freep(&(*inout)->name);
217  av_freep(inout);
218  *inout = next;
219  }
220 }
221 
222 static AVFilterInOut *extract_inout(const char *label, AVFilterInOut **links)
223 {
224  AVFilterInOut *ret;
225 
226  while (*links && (!(*links)->name || strcmp((*links)->name, label)))
227  links = &((*links)->next);
228 
229  ret = *links;
230 
231  if (ret) {
232  *links = ret->next;
233  ret->next = NULL;
234  }
235 
236  return ret;
237 }
238 
239 static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element)
240 {
241  element->next = *inouts;
242  *inouts = element;
243 }
244 
245 static void append_inout(AVFilterInOut **inouts, AVFilterInOut **element)
246 {
247  while (*inouts && (*inouts)->next)
248  inouts = &((*inouts)->next);
249 
250  if (!*inouts)
251  *inouts = *element;
252  else
253  (*inouts)->next = *element;
254  *element = NULL;
255 }
256 
257 static int link_filter_inouts(AVFilterContext *filt_ctx,
258  AVFilterInOut **curr_inputs,
259  AVFilterInOut **open_inputs, void *log_ctx)
260 {
261  int pad, ret;
262 
263  for (pad = 0; pad < filt_ctx->nb_inputs; pad++) {
264  AVFilterInOut *p = *curr_inputs;
265 
266  if (p) {
267  *curr_inputs = (*curr_inputs)->next;
268  p->next = NULL;
269  } else if (!(p = av_mallocz(sizeof(*p))))
270  return AVERROR(ENOMEM);
271 
272  if (p->filter_ctx) {
273  ret = link_filter(p->filter_ctx, p->pad_idx, filt_ctx, pad, log_ctx);
274  av_freep(&p->name);
275  av_freep(&p);
276  if (ret < 0)
277  return ret;
278  } else {
279  p->filter_ctx = filt_ctx;
280  p->pad_idx = pad;
281  append_inout(open_inputs, &p);
282  }
283  }
284 
285  if (*curr_inputs) {
286  av_log(log_ctx, AV_LOG_ERROR,
287  "Too many inputs specified for the \"%s\" filter.\n",
288  filt_ctx->filter->name);
289  return AVERROR(EINVAL);
290  }
291 
292  pad = filt_ctx->nb_outputs;
293  while (pad--) {
294  AVFilterInOut *currlinkn = av_mallocz(sizeof(AVFilterInOut));
295  if (!currlinkn)
296  return AVERROR(ENOMEM);
297  currlinkn->filter_ctx = filt_ctx;
298  currlinkn->pad_idx = pad;
299  insert_inout(curr_inputs, currlinkn);
300  }
301 
302  return 0;
303 }
304 
305 static int parse_inputs(const char **buf, AVFilterInOut **curr_inputs,
306  AVFilterInOut **open_outputs, void *log_ctx)
307 {
308  AVFilterInOut *parsed_inputs = NULL;
309  int pad = 0;
310 
311  while (**buf == '[') {
312  char *name = parse_link_name(buf, log_ctx);
313  AVFilterInOut *match;
314 
315  if (!name) {
316  avfilter_inout_free(&parsed_inputs);
317  return AVERROR(EINVAL);
318  }
319 
320  /* First check if the label is not in the open_outputs list */
321  match = extract_inout(name, open_outputs);
322 
323  if (match) {
324  av_free(name);
325  } else {
326  /* Not in the list, so add it as an input */
327  if (!(match = av_mallocz(sizeof(AVFilterInOut)))) {
328  avfilter_inout_free(&parsed_inputs);
329  av_free(name);
330  return AVERROR(ENOMEM);
331  }
332  match->name = name;
333  match->pad_idx = pad;
334  }
335 
336  append_inout(&parsed_inputs, &match);
337 
338  *buf += strspn(*buf, WHITESPACES);
339  pad++;
340  }
341 
342  append_inout(&parsed_inputs, curr_inputs);
343  *curr_inputs = parsed_inputs;
344 
345  return pad;
346 }
347 
348 static int parse_outputs(const char **buf, AVFilterInOut **curr_inputs,
349  AVFilterInOut **open_inputs,
350  AVFilterInOut **open_outputs, void *log_ctx)
351 {
352  int ret, pad = 0;
353 
354  while (**buf == '[') {
355  char *name = parse_link_name(buf, log_ctx);
356  AVFilterInOut *match;
357 
358  AVFilterInOut *input = *curr_inputs;
359 
360  if (!name)
361  return AVERROR(EINVAL);
362 
363  if (!input) {
364  av_log(log_ctx, AV_LOG_ERROR,
365  "No output pad can be associated to link label '%s'.\n", name);
366  av_free(name);
367  return AVERROR(EINVAL);
368  }
369  *curr_inputs = (*curr_inputs)->next;
370 
371  /* First check if the label is not in the open_inputs list */
372  match = extract_inout(name, open_inputs);
373 
374  if (match) {
375  ret = link_filter(input->filter_ctx, input->pad_idx,
376  match->filter_ctx, match->pad_idx, log_ctx);
377  av_freep(&match->name);
378  av_freep(&name);
379  av_freep(&match);
380  av_freep(&input);
381  if (ret < 0)
382  return ret;
383  } else {
384  /* Not in the list, so add the first input as an open_output */
385  input->name = name;
386  insert_inout(open_outputs, input);
387  }
388  *buf += strspn(*buf, WHITESPACES);
389  pad++;
390  }
391 
392  return pad;
393 }
394 
395 static int parse_sws_flags(const char **buf, AVFilterGraph *graph)
396 {
397  char *p = strchr(*buf, ';');
398 
399  if (strncmp(*buf, "sws_flags=", 10))
400  return 0;
401 
402  if (!p) {
403  av_log(graph, AV_LOG_ERROR, "sws_flags not terminated with ';'.\n");
404  return AVERROR(EINVAL);
405  }
406 
407  *buf += 4; // keep the 'flags=' part
408 
409  av_freep(&graph->scale_sws_opts);
410  if (!(graph->scale_sws_opts = av_mallocz(p - *buf + 1)))
411  return AVERROR(ENOMEM);
412  av_strlcpy(graph->scale_sws_opts, *buf, p - *buf + 1);
413 
414  *buf = p + 1;
415  return 0;
416 }
417 
421 {
422  int index = 0, ret = 0;
423  char chr = 0;
424 
425  AVFilterInOut *curr_inputs = NULL, *open_inputs = NULL, *open_outputs = NULL;
426 
427  filters += strspn(filters, WHITESPACES);
428 
429  if ((ret = parse_sws_flags(&filters, graph)) < 0)
430  goto fail;
431 
432  do {
434  filters += strspn(filters, WHITESPACES);
435 
436  if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, graph)) < 0)
437  goto end;
438  if ((ret = parse_filter(&filter, &filters, graph, index, graph)) < 0)
439  goto end;
440 
441 
442  if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, graph)) < 0)
443  goto end;
444 
445  if ((ret = parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,
446  graph)) < 0)
447  goto end;
448 
449  filters += strspn(filters, WHITESPACES);
450  chr = *filters++;
451 
452  if (chr == ';' && curr_inputs)
453  append_inout(&open_outputs, &curr_inputs);
454  index++;
455  } while (chr == ',' || chr == ';');
456 
457  if (chr) {
458  av_log(graph, AV_LOG_ERROR,
459  "Unable to parse graph description substring: \"%s\"\n",
460  filters - 1);
461  ret = AVERROR(EINVAL);
462  goto end;
463  }
464 
465  append_inout(&open_outputs, &curr_inputs);
466 
467 
468  *inputs = open_inputs;
469  *outputs = open_outputs;
470  return 0;
471 
472  fail:end:
473  while (graph->nb_filters)
474  avfilter_free(graph->filters[0]);
475  av_freep(&graph->filters);
476  avfilter_inout_free(&open_inputs);
477  avfilter_inout_free(&open_outputs);
478  avfilter_inout_free(&curr_inputs);
479 
480  *inputs = NULL;
481  *outputs = NULL;
482 
483  return ret;
484 }
485 
487  AVFilterInOut *open_inputs,
488  AVFilterInOut *open_outputs, void *log_ctx)
489 {
490  int ret;
491  AVFilterInOut *cur, *match, *inputs = NULL, *outputs = NULL;
492 
493  if ((ret = avfilter_graph_parse2(graph, filters, &inputs, &outputs)) < 0)
494  goto fail;
495 
496  /* First input can be omitted if it is "[in]" */
497  if (inputs && !inputs->name)
498  inputs->name = av_strdup("in");
499  for (cur = inputs; cur; cur = cur->next) {
500  if (!cur->name) {
501  av_log(log_ctx, AV_LOG_ERROR,
502  "Not enough inputs specified for the \"%s\" filter.\n",
503  cur->filter_ctx->filter->name);
504  ret = AVERROR(EINVAL);
505  goto fail;
506  }
507  if (!(match = extract_inout(cur->name, &open_outputs)))
508  continue;
509  ret = avfilter_link(match->filter_ctx, match->pad_idx,
510  cur->filter_ctx, cur->pad_idx);
511  avfilter_inout_free(&match);
512  if (ret < 0)
513  goto fail;
514  }
515 
516  /* Last output can be omitted if it is "[out]" */
517  if (outputs && !outputs->name)
518  outputs->name = av_strdup("out");
519  for (cur = outputs; cur; cur = cur->next) {
520  if (!cur->name) {
521  av_log(log_ctx, AV_LOG_ERROR,
522  "Invalid filterchain containing an unlabelled output pad: \"%s\"\n",
523  filters);
524  ret = AVERROR(EINVAL);
525  goto fail;
526  }
527  if (!(match = extract_inout(cur->name, &open_inputs)))
528  continue;
529  ret = avfilter_link(cur->filter_ctx, cur->pad_idx,
530  match->filter_ctx, match->pad_idx);
531  avfilter_inout_free(&match);
532  if (ret < 0)
533  goto fail;
534  }
535 
536  fail:
537  if (ret < 0) {
538  while (graph->nb_filters)
539  avfilter_free(graph->filters[0]);
540  av_freep(&graph->filters);
541  }
542  avfilter_inout_free(&inputs);
543  avfilter_inout_free(&outputs);
544  avfilter_inout_free(&open_inputs);
545  avfilter_inout_free(&open_outputs);
546  return ret;
547 }
548 
550  AVFilterInOut **open_inputs_ptr, AVFilterInOut **open_outputs_ptr,
551  void *log_ctx)
552 {
553  int index = 0, ret = 0;
554  char chr = 0;
555 
556  AVFilterInOut *curr_inputs = NULL;
557  AVFilterInOut *open_inputs = open_inputs_ptr ? *open_inputs_ptr : NULL;
558  AVFilterInOut *open_outputs = open_outputs_ptr ? *open_outputs_ptr : NULL;
559 
560  if ((ret = parse_sws_flags(&filters, graph)) < 0)
561  goto end;
562 
563  do {
565  const char *filterchain = filters;
566  filters += strspn(filters, WHITESPACES);
567 
568  if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, log_ctx)) < 0)
569  goto end;
570 
571  if ((ret = parse_filter(&filter, &filters, graph, index, log_ctx)) < 0)
572  goto end;
573 
574  if (filter->nb_inputs == 1 && !curr_inputs && !index) {
575  /* First input pad, assume it is "[in]" if not specified */
576  const char *tmp = "[in]";
577  if ((ret = parse_inputs(&tmp, &curr_inputs, &open_outputs, log_ctx)) < 0)
578  goto end;
579  }
580 
581  if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, log_ctx)) < 0)
582  goto end;
583 
584  if ((ret = parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,
585  log_ctx)) < 0)
586  goto end;
587 
588  filters += strspn(filters, WHITESPACES);
589  chr = *filters++;
590 
591  if (chr == ';' && curr_inputs) {
592  av_log(log_ctx, AV_LOG_ERROR,
593  "Invalid filterchain containing an unlabelled output pad: \"%s\"\n",
594  filterchain);
595  ret = AVERROR(EINVAL);
596  goto end;
597  }
598  index++;
599  } while (chr == ',' || chr == ';');
600 
601  if (chr) {
602  av_log(log_ctx, AV_LOG_ERROR,
603  "Unable to parse graph description substring: \"%s\"\n",
604  filters - 1);
605  ret = AVERROR(EINVAL);
606  goto end;
607  }
608 
609  if (curr_inputs) {
610  /* Last output pad, assume it is "[out]" if not specified */
611  const char *tmp = "[out]";
612  if ((ret = parse_outputs(&tmp, &curr_inputs, &open_inputs, &open_outputs,
613  log_ctx)) < 0)
614  goto end;
615  }
616 
617 end:
618  /* clear open_in/outputs only if not passed as parameters */
619  if (open_inputs_ptr) *open_inputs_ptr = open_inputs;
620  else avfilter_inout_free(&open_inputs);
621  if (open_outputs_ptr) *open_outputs_ptr = open_outputs;
622  else avfilter_inout_free(&open_outputs);
623  avfilter_inout_free(&curr_inputs);
624 
625  if (ret < 0) {
626  while (graph->nb_filters)
627  avfilter_free(graph->filters[0]);
628  av_freep(&graph->filters);
629  }
630  return ret;
631 }
AVFilterContext ** filters
Definition: avfilter.h:842
#define NULL
Definition: coverity.c:32
void avfilter_free(AVFilterContext *filter)
Free a filter context.
Definition: avfilter.c:742
Main libavfilter public API header.
Memory handling functions.
void avfilter_inout_free(AVFilterInOut **inout)
Free the supplied list of AVFilterInOut and set *inout to NULL.
Definition: graphparser.c:212
struct AVFilterInOut * next
next input/input in the list, NULL if this is the last
Definition: avfilter.h:1014
char * scale_sws_opts
sws options to use for the auto-inserted scale filters
Definition: avfilter.h:845
int avfilter_link(AVFilterContext *src, unsigned srcpad, AVFilterContext *dst, unsigned dstpad)
Link two filters together.
Definition: avfilter.c:135
static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, int clip)
Definition: cfhd.c:196
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:92
static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element)
Definition: graphparser.c:239
int avfilter_graph_parse2(AVFilterGraph *graph, const char *filters, AVFilterInOut **inputs, AVFilterInOut **outputs)
Add a graph described by a string to a graph.
Definition: graphparser.c:418
#define av_log(a,...)
static int parse_inputs(const char **buf, AVFilterInOut **curr_inputs, AVFilterInOut **open_outputs, void *log_ctx)
Definition: graphparser.c:305
#define src
Definition: vp8dsp.c:254
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static AVFilterInOut * extract_inout(const char *label, AVFilterInOut **links)
Definition: graphparser.c:222
#define AVERROR(e)
Definition: error.h:43
unsigned nb_outputs
number of output pads
Definition: avfilter.h:351
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:237
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:83
#define fail()
Definition: checkasm.h:123
char * av_get_token(const char **buf, const char *term)
Unescape the given string until a non escaped terminating char, and return the token corresponding to...
Definition: avstring.c:149
static int create_filter(AVFilterContext **filt_ctx, AVFilterGraph *ctx, int index, const char *name, const char *args, void *log_ctx)
Create an instance of a filter, initialize and insert it in the filtergraph in *ctx.
Definition: graphparser.c:98
const AVFilter * avfilter_get_by_name(const char *name)
Get a filter definition matching the given name.
Definition: allfilters.c:520
char * av_asprintf(const char *fmt,...)
Definition: avstring.c:113
AVDictionary * opts
Definition: movenc.c:50
const char * name
Definition: qsvenc.c:46
unsigned nb_inputs
number of input pads
Definition: avfilter.h:347
AVFormatContext * ctx
Definition: movenc.c:48
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
AVFilterContext * filter_ctx
filter context associated to this input/output
Definition: avfilter.h:1008
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
int avfilter_init_str(AVFilterContext *filter, const char *args)
Initialize a filter with the supplied parameters.
Definition: avfilter.c:919
A linked-list of the inputs/outputs of the filter chain.
Definition: avfilter.h:1003
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:253
static int parse_sws_flags(const char **buf, AVFilterGraph *graph)
Definition: graphparser.c:395
static void append_inout(AVFilterInOut **inouts, AVFilterInOut **element)
Definition: graphparser.c:245
int avfilter_graph_parse(AVFilterGraph *graph, const char *filters, AVFilterInOut *open_inputs, AVFilterInOut *open_outputs, void *log_ctx)
Add a graph described by a string to a graph.
Definition: graphparser.c:486
Filter definition.
Definition: avfilter.h:144
int index
Definition: gxfenc.c:89
int pad_idx
index of the filt_ctx pad to use for linking
Definition: avfilter.h:1011
const char * name
Filter name.
Definition: avfilter.h:148
unsigned nb_filters
Definition: avfilter.h:843
#define snprintf
Definition: snprintf.h:34
static int parse_filter(AVFilterContext **filt_ctx, const char **buf, AVFilterGraph *graph, int index, void *log_ctx)
Parse a string of the form FILTER_NAME[=PARAMS], and create a corresponding filter instance which is ...
Definition: graphparser.c:182
char * name
unique name for this input/output in the list
Definition: avfilter.h:1005
static const int8_t filt[NUMTAPS]
Definition: af_earwax.c:39
static int parse_outputs(const char **buf, AVFilterInOut **curr_inputs, AVFilterInOut **open_inputs, AVFilterInOut **open_outputs, void *log_ctx)
Definition: graphparser.c:348
AVFilterInOut * avfilter_inout_alloc(void)
Allocate a single AVFilterInOut entry.
Definition: graphparser.c:207
static int link_filter(AVFilterContext *src, int srcpad, AVFilterContext *dst, int dstpad, void *log_ctx)
Link two filters together.
Definition: graphparser.c:37
#define av_free(p)
AVFilterContext * avfilter_graph_alloc_filter(AVFilterGraph *graph, const AVFilter *filter, const char *name)
Create a new filter instance in a filter graph.
static const struct PPFilter filters[]
Definition: postprocess.c:134
static char * parse_link_name(const char **buf, void *log_ctx)
Parse the name of a link, which has the format "[linkname]".
Definition: graphparser.c:58
static int link_filter_inouts(AVFilterContext *filt_ctx, AVFilterInOut **curr_inputs, AVFilterInOut **open_inputs, void *log_ctx)
Definition: graphparser.c:257
int avfilter_graph_parse_ptr(AVFilterGraph *graph, const char *filters, AVFilterInOut **open_inputs_ptr, AVFilterInOut **open_outputs_ptr, void *log_ctx)
Add a graph described by a string to a graph.
Definition: graphparser.c:549
An instance of a filter.
Definition: avfilter.h:338
#define WHITESPACES
Definition: graphparser.c:30
#define av_freep(p)
const AVFilter * filter
the AVFilter of which this is an instance
Definition: avfilter.h:341
static uint8_t tmp[11]
Definition: aes_ctr.c:26