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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  goto fail;
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  }
80 
81  return name;
82 }
83 
84 /**
85  * Create an instance of a filter, initialize and insert it in the
86  * filtergraph in *ctx.
87  *
88  * @param filt_ctx put here a filter context in case of successful creation and configuration, NULL otherwise.
89  * @param ctx the filtergraph context
90  * @param index an index which is supposed to be unique for each filter instance added to the filtergraph
91  * @param name the name of the filter to create, can be filter name or filter_name\@id as instance name
92  * @param args the arguments provided to the filter during its initialization
93  * @param log_ctx the log context to use
94  * @return >= 0 in case of success, a negative AVERROR code otherwise
95  */
96 static int create_filter(AVFilterContext **filt_ctx, AVFilterGraph *ctx, int index,
97  const char *name, const char *args, void *log_ctx)
98 {
99  const AVFilter *filt;
100  char name2[30];
101  const char *inst_name = NULL, *filt_name = NULL;
102  char *tmp_args = NULL;
103  int ret, k;
104 
105  av_strlcpy(name2, name, sizeof(name2));
106 
107  for (k = 0; name2[k]; k++) {
108  if (name2[k] == '@' && name[k+1]) {
109  name2[k] = 0;
110  inst_name = name;
111  filt_name = name2;
112  break;
113  }
114  }
115 
116  if (!inst_name) {
117  snprintf(name2, sizeof(name2), "Parsed_%s_%d", name, index);
118  inst_name = name2;
119  filt_name = name;
120  }
121 
122  filt = avfilter_get_by_name(filt_name);
123 
124  if (!filt) {
125  av_log(log_ctx, AV_LOG_ERROR,
126  "No such filter: '%s'\n", filt_name);
127  return AVERROR(EINVAL);
128  }
129 
130  *filt_ctx = avfilter_graph_alloc_filter(ctx, filt, inst_name);
131  if (!*filt_ctx) {
132  av_log(log_ctx, AV_LOG_ERROR,
133  "Error creating filter '%s'\n", filt_name);
134  return AVERROR(ENOMEM);
135  }
136 
137  if (!strcmp(filt_name, "scale") && (!args || !strstr(args, "flags")) &&
138  ctx->scale_sws_opts) {
139  if (args) {
140  tmp_args = av_asprintf("%s:%s",
141  args, ctx->scale_sws_opts);
142  if (!tmp_args)
143  return AVERROR(ENOMEM);
144  args = tmp_args;
145  } else
146  args = ctx->scale_sws_opts;
147  }
148 
149  ret = avfilter_init_str(*filt_ctx, args);
150  if (ret < 0) {
151  av_log(log_ctx, AV_LOG_ERROR,
152  "Error initializing filter '%s'", filt_name);
153  if (args)
154  av_log(log_ctx, AV_LOG_ERROR, " with args '%s'", args);
155  av_log(log_ctx, AV_LOG_ERROR, "\n");
156  avfilter_free(*filt_ctx);
157  *filt_ctx = NULL;
158  }
159 
160  av_free(tmp_args);
161  return ret;
162 }
163 
164 /**
165  * Parse a string of the form FILTER_NAME[=PARAMS], and create a
166  * corresponding filter instance which is added to graph with
167  * create_filter().
168  *
169  * @param filt_ctx Pointer that is set to the created and configured filter
170  * context on success, set to NULL on failure.
171  * @param filt_ctx put here a pointer to the created filter context on
172  * success, NULL otherwise
173  * @param buf pointer to the buffer to parse, *buf will be updated to
174  * point to the char next after the parsed string
175  * @param index an index which is assigned to the created filter
176  * instance, and which is supposed to be unique for each filter
177  * instance added to the filtergraph
178  * @return >= 0 in case of success, a negative AVERROR code otherwise
179  */
180 static int parse_filter(AVFilterContext **filt_ctx, const char **buf, AVFilterGraph *graph,
181  int index, void *log_ctx)
182 {
183  char *opts = NULL;
184  char *name = av_get_token(buf, "=,;[");
185  int ret;
186 
187  if (**buf == '=') {
188  (*buf)++;
189  opts = av_get_token(buf, "[],;");
190  }
191 
192  ret = create_filter(filt_ctx, graph, index, name, opts, log_ctx);
193  av_free(name);
194  av_free(opts);
195  return ret;
196 }
197 
199 {
200  return av_mallocz(sizeof(AVFilterInOut));
201 }
202 
204 {
205  while (*inout) {
206  AVFilterInOut *next = (*inout)->next;
207  av_freep(&(*inout)->name);
208  av_freep(inout);
209  *inout = next;
210  }
211 }
212 
213 static AVFilterInOut *extract_inout(const char *label, AVFilterInOut **links)
214 {
215  AVFilterInOut *ret;
216 
217  while (*links && (!(*links)->name || strcmp((*links)->name, label)))
218  links = &((*links)->next);
219 
220  ret = *links;
221 
222  if (ret) {
223  *links = ret->next;
224  ret->next = NULL;
225  }
226 
227  return ret;
228 }
229 
230 static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element)
231 {
232  element->next = *inouts;
233  *inouts = element;
234 }
235 
236 static void append_inout(AVFilterInOut **inouts, AVFilterInOut **element)
237 {
238  while (*inouts && (*inouts)->next)
239  inouts = &((*inouts)->next);
240 
241  if (!*inouts)
242  *inouts = *element;
243  else
244  (*inouts)->next = *element;
245  *element = NULL;
246 }
247 
248 static int link_filter_inouts(AVFilterContext *filt_ctx,
249  AVFilterInOut **curr_inputs,
250  AVFilterInOut **open_inputs, void *log_ctx)
251 {
252  int pad, ret;
253 
254  for (pad = 0; pad < filt_ctx->nb_inputs; pad++) {
255  AVFilterInOut *p = *curr_inputs;
256 
257  if (p) {
258  *curr_inputs = (*curr_inputs)->next;
259  p->next = NULL;
260  } else if (!(p = av_mallocz(sizeof(*p))))
261  return AVERROR(ENOMEM);
262 
263  if (p->filter_ctx) {
264  ret = link_filter(p->filter_ctx, p->pad_idx, filt_ctx, pad, log_ctx);
265  av_freep(&p->name);
266  av_freep(&p);
267  if (ret < 0)
268  return ret;
269  } else {
270  p->filter_ctx = filt_ctx;
271  p->pad_idx = pad;
272  append_inout(open_inputs, &p);
273  }
274  }
275 
276  if (*curr_inputs) {
277  av_log(log_ctx, AV_LOG_ERROR,
278  "Too many inputs specified for the \"%s\" filter.\n",
279  filt_ctx->filter->name);
280  return AVERROR(EINVAL);
281  }
282 
283  pad = filt_ctx->nb_outputs;
284  while (pad--) {
285  AVFilterInOut *currlinkn = av_mallocz(sizeof(AVFilterInOut));
286  if (!currlinkn)
287  return AVERROR(ENOMEM);
288  currlinkn->filter_ctx = filt_ctx;
289  currlinkn->pad_idx = pad;
290  insert_inout(curr_inputs, currlinkn);
291  }
292 
293  return 0;
294 }
295 
296 static int parse_inputs(const char **buf, AVFilterInOut **curr_inputs,
297  AVFilterInOut **open_outputs, void *log_ctx)
298 {
299  AVFilterInOut *parsed_inputs = NULL;
300  int pad = 0;
301 
302  while (**buf == '[') {
303  char *name = parse_link_name(buf, log_ctx);
304  AVFilterInOut *match;
305 
306  if (!name)
307  return AVERROR(EINVAL);
308 
309  /* First check if the label is not in the open_outputs list */
310  match = extract_inout(name, open_outputs);
311 
312  if (match) {
313  av_free(name);
314  } else {
315  /* Not in the list, so add it as an input */
316  if (!(match = av_mallocz(sizeof(AVFilterInOut)))) {
317  av_free(name);
318  return AVERROR(ENOMEM);
319  }
320  match->name = name;
321  match->pad_idx = pad;
322  }
323 
324  append_inout(&parsed_inputs, &match);
325 
326  *buf += strspn(*buf, WHITESPACES);
327  pad++;
328  }
329 
330  append_inout(&parsed_inputs, curr_inputs);
331  *curr_inputs = parsed_inputs;
332 
333  return pad;
334 }
335 
336 static int parse_outputs(const char **buf, AVFilterInOut **curr_inputs,
337  AVFilterInOut **open_inputs,
338  AVFilterInOut **open_outputs, void *log_ctx)
339 {
340  int ret, pad = 0;
341 
342  while (**buf == '[') {
343  char *name = parse_link_name(buf, log_ctx);
344  AVFilterInOut *match;
345 
346  AVFilterInOut *input = *curr_inputs;
347 
348  if (!name)
349  return AVERROR(EINVAL);
350 
351  if (!input) {
352  av_log(log_ctx, AV_LOG_ERROR,
353  "No output pad can be associated to link label '%s'.\n", name);
354  av_free(name);
355  return AVERROR(EINVAL);
356  }
357  *curr_inputs = (*curr_inputs)->next;
358 
359  /* First check if the label is not in the open_inputs list */
360  match = extract_inout(name, open_inputs);
361 
362  if (match) {
363  if ((ret = link_filter(input->filter_ctx, input->pad_idx,
364  match->filter_ctx, match->pad_idx, log_ctx)) < 0) {
365  av_free(name);
366  return ret;
367  }
368  av_freep(&match->name);
369  av_freep(&name);
370  av_freep(&match);
371  av_freep(&input);
372  } else {
373  /* Not in the list, so add the first input as an open_output */
374  input->name = name;
375  insert_inout(open_outputs, input);
376  }
377  *buf += strspn(*buf, WHITESPACES);
378  pad++;
379  }
380 
381  return pad;
382 }
383 
384 static int parse_sws_flags(const char **buf, AVFilterGraph *graph)
385 {
386  char *p = strchr(*buf, ';');
387 
388  if (strncmp(*buf, "sws_flags=", 10))
389  return 0;
390 
391  if (!p) {
392  av_log(graph, AV_LOG_ERROR, "sws_flags not terminated with ';'.\n");
393  return AVERROR(EINVAL);
394  }
395 
396  *buf += 4; // keep the 'flags=' part
397 
398  av_freep(&graph->scale_sws_opts);
399  if (!(graph->scale_sws_opts = av_mallocz(p - *buf + 1)))
400  return AVERROR(ENOMEM);
401  av_strlcpy(graph->scale_sws_opts, *buf, p - *buf + 1);
402 
403  *buf = p + 1;
404  return 0;
405 }
406 
410 {
411  int index = 0, ret = 0;
412  char chr = 0;
413 
414  AVFilterInOut *curr_inputs = NULL, *open_inputs = NULL, *open_outputs = NULL;
415 
416  filters += strspn(filters, WHITESPACES);
417 
418  if ((ret = parse_sws_flags(&filters, graph)) < 0)
419  goto fail;
420 
421  do {
423  filters += strspn(filters, WHITESPACES);
424 
425  if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, graph)) < 0)
426  goto end;
427  if ((ret = parse_filter(&filter, &filters, graph, index, graph)) < 0)
428  goto end;
429 
430 
431  if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, graph)) < 0)
432  goto end;
433 
434  if ((ret = parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,
435  graph)) < 0)
436  goto end;
437 
438  filters += strspn(filters, WHITESPACES);
439  chr = *filters++;
440 
441  if (chr == ';' && curr_inputs)
442  append_inout(&open_outputs, &curr_inputs);
443  index++;
444  } while (chr == ',' || chr == ';');
445 
446  if (chr) {
447  av_log(graph, AV_LOG_ERROR,
448  "Unable to parse graph description substring: \"%s\"\n",
449  filters - 1);
450  ret = AVERROR(EINVAL);
451  goto end;
452  }
453 
454  append_inout(&open_outputs, &curr_inputs);
455 
456 
457  *inputs = open_inputs;
458  *outputs = open_outputs;
459  return 0;
460 
461  fail:end:
462  while (graph->nb_filters)
463  avfilter_free(graph->filters[0]);
464  av_freep(&graph->filters);
465  avfilter_inout_free(&open_inputs);
466  avfilter_inout_free(&open_outputs);
467  avfilter_inout_free(&curr_inputs);
468 
469  *inputs = NULL;
470  *outputs = NULL;
471 
472  return ret;
473 }
474 
476  AVFilterInOut *open_inputs,
477  AVFilterInOut *open_outputs, void *log_ctx)
478 {
479  int ret;
480  AVFilterInOut *cur, *match, *inputs = NULL, *outputs = NULL;
481 
482  if ((ret = avfilter_graph_parse2(graph, filters, &inputs, &outputs)) < 0)
483  goto fail;
484 
485  /* First input can be omitted if it is "[in]" */
486  if (inputs && !inputs->name)
487  inputs->name = av_strdup("in");
488  for (cur = inputs; cur; cur = cur->next) {
489  if (!cur->name) {
490  av_log(log_ctx, AV_LOG_ERROR,
491  "Not enough inputs specified for the \"%s\" filter.\n",
492  cur->filter_ctx->filter->name);
493  ret = AVERROR(EINVAL);
494  goto fail;
495  }
496  if (!(match = extract_inout(cur->name, &open_outputs)))
497  continue;
498  ret = avfilter_link(match->filter_ctx, match->pad_idx,
499  cur->filter_ctx, cur->pad_idx);
500  avfilter_inout_free(&match);
501  if (ret < 0)
502  goto fail;
503  }
504 
505  /* Last output can be omitted if it is "[out]" */
506  if (outputs && !outputs->name)
507  outputs->name = av_strdup("out");
508  for (cur = outputs; cur; cur = cur->next) {
509  if (!cur->name) {
510  av_log(log_ctx, AV_LOG_ERROR,
511  "Invalid filterchain containing an unlabelled output pad: \"%s\"\n",
512  filters);
513  ret = AVERROR(EINVAL);
514  goto fail;
515  }
516  if (!(match = extract_inout(cur->name, &open_inputs)))
517  continue;
518  ret = avfilter_link(cur->filter_ctx, cur->pad_idx,
519  match->filter_ctx, match->pad_idx);
520  avfilter_inout_free(&match);
521  if (ret < 0)
522  goto fail;
523  }
524 
525  fail:
526  if (ret < 0) {
527  while (graph->nb_filters)
528  avfilter_free(graph->filters[0]);
529  av_freep(&graph->filters);
530  }
531  avfilter_inout_free(&inputs);
532  avfilter_inout_free(&outputs);
533  avfilter_inout_free(&open_inputs);
534  avfilter_inout_free(&open_outputs);
535  return ret;
536 }
537 
539  AVFilterInOut **open_inputs_ptr, AVFilterInOut **open_outputs_ptr,
540  void *log_ctx)
541 {
542  int index = 0, ret = 0;
543  char chr = 0;
544 
545  AVFilterInOut *curr_inputs = NULL;
546  AVFilterInOut *open_inputs = open_inputs_ptr ? *open_inputs_ptr : NULL;
547  AVFilterInOut *open_outputs = open_outputs_ptr ? *open_outputs_ptr : NULL;
548 
549  if ((ret = parse_sws_flags(&filters, graph)) < 0)
550  goto end;
551 
552  do {
554  const char *filterchain = filters;
555  filters += strspn(filters, WHITESPACES);
556 
557  if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, log_ctx)) < 0)
558  goto end;
559 
560  if ((ret = parse_filter(&filter, &filters, graph, index, log_ctx)) < 0)
561  goto end;
562 
563  if (filter->nb_inputs == 1 && !curr_inputs && !index) {
564  /* First input pad, assume it is "[in]" if not specified */
565  const char *tmp = "[in]";
566  if ((ret = parse_inputs(&tmp, &curr_inputs, &open_outputs, log_ctx)) < 0)
567  goto end;
568  }
569 
570  if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, log_ctx)) < 0)
571  goto end;
572 
573  if ((ret = parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,
574  log_ctx)) < 0)
575  goto end;
576 
577  filters += strspn(filters, WHITESPACES);
578  chr = *filters++;
579 
580  if (chr == ';' && curr_inputs) {
581  av_log(log_ctx, AV_LOG_ERROR,
582  "Invalid filterchain containing an unlabelled output pad: \"%s\"\n",
583  filterchain);
584  ret = AVERROR(EINVAL);
585  goto end;
586  }
587  index++;
588  } while (chr == ',' || chr == ';');
589 
590  if (chr) {
591  av_log(log_ctx, AV_LOG_ERROR,
592  "Unable to parse graph description substring: \"%s\"\n",
593  filters - 1);
594  ret = AVERROR(EINVAL);
595  goto end;
596  }
597 
598  if (curr_inputs) {
599  /* Last output pad, assume it is "[out]" if not specified */
600  const char *tmp = "[out]";
601  if ((ret = parse_outputs(&tmp, &curr_inputs, &open_inputs, &open_outputs,
602  log_ctx)) < 0)
603  goto end;
604  }
605 
606 end:
607  /* clear open_in/outputs only if not passed as parameters */
608  if (open_inputs_ptr) *open_inputs_ptr = open_inputs;
609  else avfilter_inout_free(&open_inputs);
610  if (open_outputs_ptr) *open_outputs_ptr = open_outputs;
611  else avfilter_inout_free(&open_outputs);
612  avfilter_inout_free(&curr_inputs);
613 
614  if (ret < 0) {
615  while (graph->nb_filters)
616  avfilter_free(graph->filters[0]);
617  av_freep(&graph->filters);
618  }
619  return ret;
620 }
AVFilterContext ** filters
Definition: avfilter.h:805
#define NULL
Definition: coverity.c:32
void avfilter_free(AVFilterContext *filter)
Free a filter context.
Definition: avfilter.c:793
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:203
struct AVFilterInOut * next
next input/input in the list, NULL if this is the last
Definition: avfilter.h:977
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
#define src
Definition: vp8dsp.c:254
char * scale_sws_opts
sws options to use for the auto-inserted scale filters
Definition: avfilter.h:808
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:97
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element)
Definition: graphparser.c:230
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:407
#define av_log(a,...)
static int parse_inputs(const char **buf, AVFilterInOut **curr_inputs, AVFilterInOut **open_outputs, void *log_ctx)
Definition: graphparser.c:296
#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:213
#define AVERROR(e)
Definition: error.h:43
unsigned nb_outputs
number of output pads
Definition: avfilter.h:351
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:109
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:96
const AVFilter * avfilter_get_by_name(const char *name)
Get a filter definition matching the given name.
Definition: avfilter.c:579
char * av_asprintf(const char *fmt,...)
Definition: avstring.c:113
AVDictionary * opts
Definition: movenc.c:50
unsigned nb_inputs
number of input pads
Definition: avfilter.h:347
AVFormatContext * ctx
Definition: movenc.c:48
static const AVFilterPad outputs[]
Definition: af_afftfilt.c:389
AVFilterContext * filter_ctx
filter context associated to this input/output
Definition: avfilter.h:971
int avfilter_init_str(AVFilterContext *filter, const char *args)
Initialize a filter with the supplied parameters.
Definition: avfilter.c:957
A linked-list of the inputs/outputs of the filter chain.
Definition: avfilter.h:966
static const AVFilterPad inputs[]
Definition: af_afftfilt.c:379
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:251
static int parse_sws_flags(const char **buf, AVFilterGraph *graph)
Definition: graphparser.c:384
static void append_inout(AVFilterInOut **inouts, AVFilterInOut **element)
Definition: graphparser.c:236
void * buf
Definition: avisynth_c.h:690
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:475
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:974
const char * name
Filter name.
Definition: avfilter.h:148
unsigned nb_filters
Definition: avfilter.h:806
#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:180
char * name
unique name for this input/output in the list
Definition: avfilter.h:968
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:336
AVFilterInOut * avfilter_inout_alloc(void)
Allocate a single AVFilterInOut entry.
Definition: graphparser.c:198
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:248
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:538
An instance of a filter.
Definition: avfilter.h:338
#define WHITESPACES
Definition: graphparser.c:30
#define av_freep(p)
void INT64 start
Definition: avisynth_c.h:690
const AVFilter * filter
the AVFilter of which this is an instance
Definition: avfilter.h:341
const char * name
Definition: opengl_enc.c:103
static uint8_t tmp[11]
Definition: aes_ctr.c:26