FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
graphparser.c
Go to the documentation of this file.
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 filt_name the name of the filter to create
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 *filt_name, const char *args, void *log_ctx)
98 {
99  AVFilter *filt;
100  char inst_name[30];
101  char *tmp_args = NULL;
102  int ret;
103 
104  snprintf(inst_name, sizeof(inst_name), "Parsed_%s_%d", filt_name, index);
105 
106  filt = avfilter_get_by_name(filt_name);
107 
108  if (!filt) {
109  av_log(log_ctx, AV_LOG_ERROR,
110  "No such filter: '%s'\n", filt_name);
111  return AVERROR(EINVAL);
112  }
113 
114  *filt_ctx = avfilter_graph_alloc_filter(ctx, filt, inst_name);
115  if (!*filt_ctx) {
116  av_log(log_ctx, AV_LOG_ERROR,
117  "Error creating filter '%s'\n", filt_name);
118  return AVERROR(ENOMEM);
119  }
120 
121  if (!strcmp(filt_name, "scale") && (!args || !strstr(args, "flags")) &&
122  ctx->scale_sws_opts) {
123  if (args) {
124  tmp_args = av_asprintf("%s:%s",
125  args, ctx->scale_sws_opts);
126  if (!tmp_args)
127  return AVERROR(ENOMEM);
128  args = tmp_args;
129  } else
130  args = ctx->scale_sws_opts;
131  }
132 
133  ret = avfilter_init_str(*filt_ctx, args);
134  if (ret < 0) {
135  av_log(log_ctx, AV_LOG_ERROR,
136  "Error initializing filter '%s'", filt_name);
137  if (args)
138  av_log(log_ctx, AV_LOG_ERROR, " with args '%s'", args);
139  av_log(log_ctx, AV_LOG_ERROR, "\n");
140  avfilter_free(*filt_ctx);
141  *filt_ctx = NULL;
142  }
143 
144  av_free(tmp_args);
145  return ret;
146 }
147 
148 /**
149  * Parse a string of the form FILTER_NAME[=PARAMS], and create a
150  * corresponding filter instance which is added to graph with
151  * create_filter().
152  *
153  * @param filt_ctx Pointer that is set to the created and configured filter
154  * context on success, set to NULL on failure.
155  * @param filt_ctx put here a pointer to the created filter context on
156  * success, NULL otherwise
157  * @param buf pointer to the buffer to parse, *buf will be updated to
158  * point to the char next after the parsed string
159  * @param index an index which is assigned to the created filter
160  * instance, and which is supposed to be unique for each filter
161  * instance added to the filtergraph
162  * @return >= 0 in case of success, a negative AVERROR code otherwise
163  */
164 static int parse_filter(AVFilterContext **filt_ctx, const char **buf, AVFilterGraph *graph,
165  int index, void *log_ctx)
166 {
167  char *opts = NULL;
168  char *name = av_get_token(buf, "=,;[");
169  int ret;
170 
171  if (**buf == '=') {
172  (*buf)++;
173  opts = av_get_token(buf, "[],;");
174  }
175 
176  ret = create_filter(filt_ctx, graph, index, name, opts, log_ctx);
177  av_free(name);
178  av_free(opts);
179  return ret;
180 }
181 
183 {
184  return av_mallocz(sizeof(AVFilterInOut));
185 }
186 
188 {
189  while (*inout) {
190  AVFilterInOut *next = (*inout)->next;
191  av_freep(&(*inout)->name);
192  av_freep(inout);
193  *inout = next;
194  }
195 }
196 
197 static AVFilterInOut *extract_inout(const char *label, AVFilterInOut **links)
198 {
199  AVFilterInOut *ret;
200 
201  while (*links && (!(*links)->name || strcmp((*links)->name, label)))
202  links = &((*links)->next);
203 
204  ret = *links;
205 
206  if (ret) {
207  *links = ret->next;
208  ret->next = NULL;
209  }
210 
211  return ret;
212 }
213 
214 static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element)
215 {
216  element->next = *inouts;
217  *inouts = element;
218 }
219 
220 static void append_inout(AVFilterInOut **inouts, AVFilterInOut **element)
221 {
222  while (*inouts && (*inouts)->next)
223  inouts = &((*inouts)->next);
224 
225  if (!*inouts)
226  *inouts = *element;
227  else
228  (*inouts)->next = *element;
229  *element = NULL;
230 }
231 
232 static int link_filter_inouts(AVFilterContext *filt_ctx,
233  AVFilterInOut **curr_inputs,
234  AVFilterInOut **open_inputs, void *log_ctx)
235 {
236  int pad, ret;
237 
238  for (pad = 0; pad < filt_ctx->nb_inputs; pad++) {
239  AVFilterInOut *p = *curr_inputs;
240 
241  if (p) {
242  *curr_inputs = (*curr_inputs)->next;
243  p->next = NULL;
244  } else if (!(p = av_mallocz(sizeof(*p))))
245  return AVERROR(ENOMEM);
246 
247  if (p->filter_ctx) {
248  ret = link_filter(p->filter_ctx, p->pad_idx, filt_ctx, pad, log_ctx);
249  av_freep(&p->name);
250  av_freep(&p);
251  if (ret < 0)
252  return ret;
253  } else {
254  p->filter_ctx = filt_ctx;
255  p->pad_idx = pad;
256  append_inout(open_inputs, &p);
257  }
258  }
259 
260  if (*curr_inputs) {
261  av_log(log_ctx, AV_LOG_ERROR,
262  "Too many inputs specified for the \"%s\" filter.\n",
263  filt_ctx->filter->name);
264  return AVERROR(EINVAL);
265  }
266 
267  pad = filt_ctx->nb_outputs;
268  while (pad--) {
269  AVFilterInOut *currlinkn = av_mallocz(sizeof(AVFilterInOut));
270  if (!currlinkn)
271  return AVERROR(ENOMEM);
272  currlinkn->filter_ctx = filt_ctx;
273  currlinkn->pad_idx = pad;
274  insert_inout(curr_inputs, currlinkn);
275  }
276 
277  return 0;
278 }
279 
280 static int parse_inputs(const char **buf, AVFilterInOut **curr_inputs,
281  AVFilterInOut **open_outputs, void *log_ctx)
282 {
283  AVFilterInOut *parsed_inputs = NULL;
284  int pad = 0;
285 
286  while (**buf == '[') {
287  char *name = parse_link_name(buf, log_ctx);
288  AVFilterInOut *match;
289 
290  if (!name)
291  return AVERROR(EINVAL);
292 
293  /* First check if the label is not in the open_outputs list */
294  match = extract_inout(name, open_outputs);
295 
296  if (match) {
297  av_free(name);
298  } else {
299  /* Not in the list, so add it as an input */
300  if (!(match = av_mallocz(sizeof(AVFilterInOut)))) {
301  av_free(name);
302  return AVERROR(ENOMEM);
303  }
304  match->name = name;
305  match->pad_idx = pad;
306  }
307 
308  append_inout(&parsed_inputs, &match);
309 
310  *buf += strspn(*buf, WHITESPACES);
311  pad++;
312  }
313 
314  append_inout(&parsed_inputs, curr_inputs);
315  *curr_inputs = parsed_inputs;
316 
317  return pad;
318 }
319 
320 static int parse_outputs(const char **buf, AVFilterInOut **curr_inputs,
321  AVFilterInOut **open_inputs,
322  AVFilterInOut **open_outputs, void *log_ctx)
323 {
324  int ret, pad = 0;
325 
326  while (**buf == '[') {
327  char *name = parse_link_name(buf, log_ctx);
328  AVFilterInOut *match;
329 
330  AVFilterInOut *input = *curr_inputs;
331 
332  if (!name)
333  return AVERROR(EINVAL);
334 
335  if (!input) {
336  av_log(log_ctx, AV_LOG_ERROR,
337  "No output pad can be associated to link label '%s'.\n", name);
338  av_free(name);
339  return AVERROR(EINVAL);
340  }
341  *curr_inputs = (*curr_inputs)->next;
342 
343  /* First check if the label is not in the open_inputs list */
344  match = extract_inout(name, open_inputs);
345 
346  if (match) {
347  if ((ret = link_filter(input->filter_ctx, input->pad_idx,
348  match->filter_ctx, match->pad_idx, log_ctx)) < 0) {
349  av_free(name);
350  return ret;
351  }
352  av_freep(&match->name);
353  av_freep(&name);
354  av_freep(&match);
355  av_freep(&input);
356  } else {
357  /* Not in the list, so add the first input as an open_output */
358  input->name = name;
359  insert_inout(open_outputs, input);
360  }
361  *buf += strspn(*buf, WHITESPACES);
362  pad++;
363  }
364 
365  return pad;
366 }
367 
368 static int parse_sws_flags(const char **buf, AVFilterGraph *graph)
369 {
370  char *p = strchr(*buf, ';');
371 
372  if (strncmp(*buf, "sws_flags=", 10))
373  return 0;
374 
375  if (!p) {
376  av_log(graph, AV_LOG_ERROR, "sws_flags not terminated with ';'.\n");
377  return AVERROR(EINVAL);
378  }
379 
380  *buf += 4; // keep the 'flags=' part
381 
382  av_freep(&graph->scale_sws_opts);
383  if (!(graph->scale_sws_opts = av_mallocz(p - *buf + 1)))
384  return AVERROR(ENOMEM);
385  av_strlcpy(graph->scale_sws_opts, *buf, p - *buf + 1);
386 
387  *buf = p + 1;
388  return 0;
389 }
390 
394 {
395  int index = 0, ret = 0;
396  char chr = 0;
397 
398  AVFilterInOut *curr_inputs = NULL, *open_inputs = NULL, *open_outputs = NULL;
399 
400  filters += strspn(filters, WHITESPACES);
401 
402  if ((ret = parse_sws_flags(&filters, graph)) < 0)
403  goto fail;
404 
405  do {
407  filters += strspn(filters, WHITESPACES);
408 
409  if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, graph)) < 0)
410  goto end;
411  if ((ret = parse_filter(&filter, &filters, graph, index, graph)) < 0)
412  goto end;
413 
414 
415  if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, graph)) < 0)
416  goto end;
417 
418  if ((ret = parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,
419  graph)) < 0)
420  goto end;
421 
422  filters += strspn(filters, WHITESPACES);
423  chr = *filters++;
424 
425  if (chr == ';' && curr_inputs)
426  append_inout(&open_outputs, &curr_inputs);
427  index++;
428  } while (chr == ',' || chr == ';');
429 
430  if (chr) {
431  av_log(graph, AV_LOG_ERROR,
432  "Unable to parse graph description substring: \"%s\"\n",
433  filters - 1);
434  ret = AVERROR(EINVAL);
435  goto end;
436  }
437 
438  append_inout(&open_outputs, &curr_inputs);
439 
440 
441  *inputs = open_inputs;
442  *outputs = open_outputs;
443  return 0;
444 
445  fail:end:
446  while (graph->nb_filters)
447  avfilter_free(graph->filters[0]);
448  av_freep(&graph->filters);
449  avfilter_inout_free(&open_inputs);
450  avfilter_inout_free(&open_outputs);
451  avfilter_inout_free(&curr_inputs);
452 
453  *inputs = NULL;
454  *outputs = NULL;
455 
456  return ret;
457 }
458 
460  AVFilterInOut *open_inputs,
461  AVFilterInOut *open_outputs, void *log_ctx)
462 {
463  int ret;
464  AVFilterInOut *cur, *match, *inputs = NULL, *outputs = NULL;
465 
466  if ((ret = avfilter_graph_parse2(graph, filters, &inputs, &outputs)) < 0)
467  goto fail;
468 
469  /* First input can be omitted if it is "[in]" */
470  if (inputs && !inputs->name)
471  inputs->name = av_strdup("in");
472  for (cur = inputs; cur; cur = cur->next) {
473  if (!cur->name) {
474  av_log(log_ctx, AV_LOG_ERROR,
475  "Not enough inputs specified for the \"%s\" filter.\n",
476  cur->filter_ctx->filter->name);
477  ret = AVERROR(EINVAL);
478  goto fail;
479  }
480  if (!(match = extract_inout(cur->name, &open_outputs)))
481  continue;
482  ret = avfilter_link(match->filter_ctx, match->pad_idx,
483  cur->filter_ctx, cur->pad_idx);
484  avfilter_inout_free(&match);
485  if (ret < 0)
486  goto fail;
487  }
488 
489  /* Last output can be omitted if it is "[out]" */
490  if (outputs && !outputs->name)
491  outputs->name = av_strdup("out");
492  for (cur = outputs; cur; cur = cur->next) {
493  if (!cur->name) {
494  av_log(log_ctx, AV_LOG_ERROR,
495  "Invalid filterchain containing an unlabelled output pad: \"%s\"\n",
496  filters);
497  ret = AVERROR(EINVAL);
498  goto fail;
499  }
500  if (!(match = extract_inout(cur->name, &open_inputs)))
501  continue;
502  ret = avfilter_link(cur->filter_ctx, cur->pad_idx,
503  match->filter_ctx, match->pad_idx);
504  avfilter_inout_free(&match);
505  if (ret < 0)
506  goto fail;
507  }
508 
509  fail:
510  if (ret < 0) {
511  while (graph->nb_filters)
512  avfilter_free(graph->filters[0]);
513  av_freep(&graph->filters);
514  }
515  avfilter_inout_free(&inputs);
516  avfilter_inout_free(&outputs);
517  avfilter_inout_free(&open_inputs);
518  avfilter_inout_free(&open_outputs);
519  return ret;
520 }
521 
523  AVFilterInOut **open_inputs_ptr, AVFilterInOut **open_outputs_ptr,
524  void *log_ctx)
525 {
526  int index = 0, ret = 0;
527  char chr = 0;
528 
529  AVFilterInOut *curr_inputs = NULL;
530  AVFilterInOut *open_inputs = open_inputs_ptr ? *open_inputs_ptr : NULL;
531  AVFilterInOut *open_outputs = open_outputs_ptr ? *open_outputs_ptr : NULL;
532 
533  if ((ret = parse_sws_flags(&filters, graph)) < 0)
534  goto end;
535 
536  do {
538  const char *filterchain = filters;
539  filters += strspn(filters, WHITESPACES);
540 
541  if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, log_ctx)) < 0)
542  goto end;
543 
544  if ((ret = parse_filter(&filter, &filters, graph, index, log_ctx)) < 0)
545  goto end;
546 
547  if (filter->nb_inputs == 1 && !curr_inputs && !index) {
548  /* First input pad, assume it is "[in]" if not specified */
549  const char *tmp = "[in]";
550  if ((ret = parse_inputs(&tmp, &curr_inputs, &open_outputs, log_ctx)) < 0)
551  goto end;
552  }
553 
554  if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, log_ctx)) < 0)
555  goto end;
556 
557  if ((ret = parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,
558  log_ctx)) < 0)
559  goto end;
560 
561  filters += strspn(filters, WHITESPACES);
562  chr = *filters++;
563 
564  if (chr == ';' && curr_inputs) {
565  av_log(log_ctx, AV_LOG_ERROR,
566  "Invalid filterchain containing an unlabelled output pad: \"%s\"\n",
567  filterchain);
568  ret = AVERROR(EINVAL);
569  goto end;
570  }
571  index++;
572  } while (chr == ',' || chr == ';');
573 
574  if (chr) {
575  av_log(log_ctx, AV_LOG_ERROR,
576  "Unable to parse graph description substring: \"%s\"\n",
577  filters - 1);
578  ret = AVERROR(EINVAL);
579  goto end;
580  }
581 
582  if (curr_inputs) {
583  /* Last output pad, assume it is "[out]" if not specified */
584  const char *tmp = "[out]";
585  if ((ret = parse_outputs(&tmp, &curr_inputs, &open_inputs, &open_outputs,
586  log_ctx)) < 0)
587  goto end;
588  }
589 
590 end:
591  /* clear open_in/outputs only if not passed as parameters */
592  if (open_inputs_ptr) *open_inputs_ptr = open_inputs;
593  else avfilter_inout_free(&open_inputs);
594  if (open_outputs_ptr) *open_outputs_ptr = open_outputs;
595  else avfilter_inout_free(&open_outputs);
596  avfilter_inout_free(&curr_inputs);
597 
598  if (ret < 0) {
599  while (graph->nb_filters)
600  avfilter_free(graph->filters[0]);
601  av_freep(&graph->filters);
602  }
603  return ret;
604 }
AVFilterContext ** filters
Definition: avfilter.h:788
#define NULL
Definition: coverity.c:32
void avfilter_free(AVFilterContext *filter)
Free a filter context.
Definition: avfilter.c:744
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:187
struct AVFilterInOut * next
next input/input in the list, NULL if this is the last
Definition: avfilter.h:972
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:252
char * scale_sws_opts
sws options to use for the auto-inserted scale filters
Definition: avfilter.h:791
int avfilter_link(AVFilterContext *src, unsigned srcpad, AVFilterContext *dst, unsigned dstpad)
Link two filters together.
Definition: avfilter.c:133
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
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, uint8_t clip)
Definition: cfhd.c:80
static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element)
Definition: graphparser.c:214
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:391
#define av_log(a,...)
static int parse_inputs(const char **buf, AVFilterInOut **curr_inputs, AVFilterInOut **open_outputs, void *log_ctx)
Definition: graphparser.c:280
#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:197
#define AVERROR(e)
Definition: error.h:43
unsigned nb_outputs
number of output pads
Definition: avfilter.h:320
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:82
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
const AVFilter * avfilter_get_by_name(const char *name)
Get a filter definition matching the given name.
Definition: avfilter.c:519
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:316
AVFormatContext * ctx
Definition: movenc.c:48
static const AVFilterPad outputs[]
Definition: af_afftfilt.c:386
#define src
Definition: vp9dsp.c:530
AVFilterContext * filter_ctx
filter context associated to this input/output
Definition: avfilter.h:966
int avfilter_init_str(AVFilterContext *filter, const char *args)
Initialize a filter with the supplied parameters.
Definition: avfilter.c:915
A linked-list of the inputs/outputs of the filter chain.
Definition: avfilter.h:961
static const AVFilterPad inputs[]
Definition: af_afftfilt.c:376
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:267
static int parse_sws_flags(const char **buf, AVFilterGraph *graph)
Definition: graphparser.c:368
static void append_inout(AVFilterInOut **inouts, AVFilterInOut **element)
Definition: graphparser.c:220
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:459
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:969
const char * name
Filter name.
Definition: avfilter.h:148
unsigned nb_filters
Definition: avfilter.h:789
#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:164
char * name
unique name for this input/output in the list
Definition: avfilter.h:963
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:320
AVFilterInOut * avfilter_inout_alloc(void)
Allocate a single AVFilterInOut entry.
Definition: graphparser.c:182
static int create_filter(AVFilterContext **filt_ctx, AVFilterGraph *ctx, int index, const char *filt_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
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 uint8_t tmp[8]
Definition: des.c:38
static const struct PPFilter filters[]
Definition: postprocess.c:137
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:232
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:522
An instance of a filter.
Definition: avfilter.h:307
#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:310
const char * name
Definition: opengl_enc.c:103