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Merge avfiltergraphdesc.c in avfiltergraph.c Commited in SoC by Vitor Sessak on 2008-03-24 20:46:50

Originally committed as revision 12735 to svn://svn.ffmpeg.org/ffmpeg/trunk

Vitor Sessak committed 18 years ago

Commit 5c2ff9f1 parent f2ee8081 file · +338 −0Browse files

Showing the changes to libavfilter/avfiltergraph.c (1 of 1 file). Show all

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libavfilter/avfiltergraph.c+338−0
@@ -1,5 +1,6 @@
1/*1/*
2 * filter graphs2 * filter graphs
3 * copyright (c) 2008 Vitor Sessak
3 * copyright (c) 2007 Bobby Bingham4 * copyright (c) 2007 Bobby Bingham
4 *5 *
5 * This file is part of FFmpeg.6 * This file is part of FFmpeg.
@@ -19,6 +20,9 @@ · 13 unmodified lines
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */21 */
21 22
23#include <ctype.h>
24#include <string.h>
25
22#include "avfilter.h"26#include "avfilter.h"
23#include "avfiltergraph.h"27#include "avfiltergraph.h"
24 28
@@ -249,3 +253,337 @@ fail: · 224 unmodified lines
249 uninit(graph);253 uninit(graph);
250 return -1;254 return -1;
251}255}
256
257
258static void consume_whitespace(const char **buf)
259{
260 *buf += strspn(*buf, " \n\t");
261}
262
263/**
264 * get the next non-whitespace char
265 */
266static char consume_char(const char **buf)
267{
268 char out;
269 consume_whitespace(buf);
270
271 out = **buf;
272
273 if (out)
274 (*buf)++;
275
276 return out;
277}
278
279/**
280 * remove the quotation marks from a string. Ex: "aaa'bb'cc" -> "aaabbcc"
281 */
282static void unquote(char *str)
283{
284 char *p1, *p2;
285 p1=p2=str;
286 while (*p1 != 0) {
287 if (*p1 != '\'')
288 *p2++ = *p1;
289 p1++;
290 }
291
292 *p2 = 0;
293}
294
295/**
296 * Consumes a string from *buf.
297 * @return a copy of the consumed string, which should be free'd after use
298 */
299static char *consume_string(const char **buf)
300{
301 const char *start;
302 char *ret;
303 int size;
304
305 consume_whitespace(buf);
306
307 if (!(**buf))
308 return av_mallocz(1);
309
310 start = *buf;
311
312 *buf += strcspn(*buf, " ()=,'");
313
314 if (**buf == '\'') {
315 char *p = strchr(*buf + 1, '\'');
316 if (p)
317 *buf = p + 1;
318 else
319 *buf += strlen(*buf); // Move the pointer to the null end byte
320 }
321
322 size = *buf - start + 1;
323 ret = av_malloc(size);
324 memcpy(ret, start, size - 1);
325 ret[size-1] = 0;
326
327 unquote(ret);
328
329 return ret;
330}
331
332/**
333 * Parse "(linkname)"
334 * @arg name a pointer (that need to be free'd after use) to the name between
335 * parenthesis
336 */
337static void parse_link_name(const char **buf, char **name)
338{
339 consume_char(buf);
340
341 *name = consume_string(buf);
342
343 if (!*name[0])
344 goto fail;
345
346 if (consume_char(buf) != ')')
347 goto fail;
348
349 return;
350 fail:
351 av_freep(name);
352 av_log(&log_ctx, AV_LOG_ERROR, "Could not parse link name!\n");
353}
354
355/**
356 * Parse "filter=params"
357 * @arg name a pointer (that need to be free'd after use) to the name of the
358 * filter
359 * @arg ars a pointer (that need to be free'd after use) to the args of the
360 * filter
361 */
362static void parse_filter(const char **buf, char **name, char **opts)
363{
364 *name = consume_string(buf);
365
366 if (**buf == '=') {
367 consume_char(buf);
368 *opts = consume_string(buf);
369 } else {
370 *opts = NULL;
371 }
372
373}
374
375enum LinkType {
376 LinkTypeIn,
377 LinkTypeOut,
378};
379
380/**
381 * A linked-list of the inputs/outputs of the filter chain.
382 */
383typedef struct AVFilterInOut {
384 enum LinkType type;
385 char *name;
386 int instance;
387 int pad_idx;
388
389 struct AVFilterInOut *next;
390} AVFilterInOut;
391
392static void free_inout(AVFilterInOut *head)
393{
394 while (head) {
395 AVFilterInOut *next;
396 next = head->next;
397 av_free(head);
398 head = next;
399 }
400}
401
402/**
403 * Parse "(a1)(link2) ... (etc)"
404 */
405static int parse_inouts(const char **buf, AVFilterInOut **inout, int firstpad,
406 enum LinkType type, int instance)
407{
408 int pad = firstpad;
409 while (**buf == '(') {
410 AVFilterInOut *inoutn = av_malloc(sizeof(AVFilterInOut));
411 parse_link_name(buf, &inoutn->name);
412 inoutn->type = type;
413 inoutn->instance = instance;
414 inoutn->pad_idx = pad++;
415 inoutn->next = *inout;
416 *inout = inoutn;
417 }
418 return pad;
419}
420
421static AVFilterGraphDesc *parse_chain(const char *filters, int has_in)
422{
423 AVFilterGraphDesc *ret;
424 AVFilterGraphDescFilter **filterp, *filtern;
425 AVFilterGraphDescLink **linkp, *linkn;
426 AVFilterInOut *inout=NULL;
427 AVFilterInOut *head;
428
429 int index = 0;
430 char chr = 0;
431 int pad = 0;
432 int has_out = 0;
433
434 consume_whitespace(&filters);
435
436 if(!(ret = av_mallocz(sizeof(AVFilterGraphDesc))))
437 return NULL;
438
439 filterp = &ret->filters;
440 linkp = &ret->links;
441
442 do {
443 if(chr == ',') {
444 linkn = av_mallocz(sizeof(AVFilterGraphDescLink));
445 linkn->src = index-1;
446 linkn->srcpad = pad;
447 linkn->dst = index;
448 linkn->dstpad = 0;
449
450 *linkp = linkn;
451 linkp = &linkn->next;
452 }
453 pad = parse_inouts(&filters, &inout, chr == ',' || (!has_in),
454 LinkTypeIn, index);
455
456 filtern = av_mallocz(sizeof(AVFilterGraphDescFilter));
457 filtern->index = index;
458 parse_filter(&filters, &filtern->filter, &filtern->args);
459 *filterp = filtern;
460 filterp = &filtern->next;
461
462 pad = parse_inouts(&filters, &inout, 0,
463 LinkTypeOut, index);
464 chr = consume_char(&filters);
465 index++;
466 } while (chr == ',' || chr == ';');
467
468 head = inout;
469 for (; inout != NULL; inout = inout->next) {
470 if (inout->instance == -1)
471 continue; // Already processed
472
473 if (!strcmp(inout->name, "in")) {
474 if (!has_in)
475 goto fail;
476 ret->inputs = av_mallocz(sizeof(AVFilterGraphDescExport));
477 ret->inputs->filter = inout->instance;
478 ret->inputs->pad = inout->pad_idx;
479 } else if (!strcmp(inout->name, "out")) {
480 has_out = 1;
481 ret->outputs = av_mallocz(sizeof(AVFilterGraphDescExport));
482 ret->outputs->filter = inout->instance;
483 ret->outputs->pad = inout->pad_idx;
484 } else {
485 AVFilterInOut *p, *src, *dst;
486 for (p = inout->next;
487 p && strcmp(p->name,inout->name); p = p->next);
488
489 if (!p) {
490 av_log(&log_ctx, AV_LOG_ERROR, "Unmatched link: %s.\n",
491 inout->name);
492 goto fail;
493 }
494
495 if (p->type == LinkTypeIn && inout->type == LinkTypeOut) {
496 src = inout;
497 dst = p;
498 } else if (p->type == LinkTypeOut && inout->type == LinkTypeIn) {
499 src = p;
500 dst = inout;
501 } else {
502 av_log(&log_ctx, AV_LOG_ERROR, "Two links named '%s' are either both input or both output\n",
503 inout->name);
504 goto fail;
505 }
506 linkn = av_mallocz(sizeof(AVFilterGraphDescLink));
507
508 linkn->src = src->instance;
509 linkn->srcpad = src->pad_idx;
510 linkn->dst = dst->instance;
511 linkn->dstpad = dst->pad_idx;
512
513 *linkp = linkn;
514 linkp = &linkn->next;
515
516 src->instance = -1;
517 dst->instance = -1;
518 }
519 }
520
521 free_inout(head);
522
523 if (!has_in) {
524 ret->inputs = av_mallocz(sizeof(AVFilterGraphDescExport));
525 ret->inputs->filter = 0;
526 }
527 if (!has_out) {
528 ret->outputs = av_mallocz(sizeof(AVFilterGraphDescExport));
529 ret->outputs->filter = index-1;
530 }
531
532 return ret;
533
534 fail:
535 free_inout(head);
536
537 avfilter_graph_free_desc(ret);
538 return NULL;
539}
540
541/**
542 * Parse a string describing a filter graph.
543 */
544AVFilterGraphDesc *avfilter_graph_parse_chain(const char *filters)
545{
546 AVFilterGraphDesc *ret;
547
548 /* Try first to parse supposing there is no (in) element */
549 if ((ret = parse_chain(filters, 0)))
550 return ret;
551
552 /* Parse supposing there is an (in) element */
553 return parse_chain(filters, 1);
554}
555
556/**
557 * Free a graph description.
558 */
559void avfilter_graph_free_desc(AVFilterGraphDesc *desc)
560{
561 void *next;
562
563 while(desc->filters) {
564 next = desc->filters->next;
565 av_free(desc->filters->filter);
566 av_free(desc->filters->args);
567 av_free(desc->filters);
568 desc->filters = next;
569 }
570
571 while(desc->links) {
572 next = desc->links->next;
573 av_free(desc->links);
574 desc->links = next;
575 }
576
577 while(desc->inputs) {
578 next = desc->inputs->next;
579 av_free(desc->inputs);
580 desc->inputs = next;
581 }
582
583 while(desc->outputs) {
584 next = desc->outputs->next;
585 av_free(desc->outputs);
586 desc->outputs = next;
587 }
588}
589

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