3 * copyright (c) 2008 Vitor Sessak
4 * copyright (c) 2007 Bobby Bingham
6 * This file is part of FFmpeg.
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.
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.
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
26 #include "graphparser.h"
28 #include "avfiltergraph.h"
30 static int link_filter(AVFilterContext *src, int srcpad,
31 AVFilterContext *dst, int dstpad,
34 if(avfilter_link(src, srcpad, dst, dstpad)) {
35 av_log(log_ctx, AV_LOG_ERROR,
36 "cannot create the link %s:%d -> %s:%d\n",
37 src->filter->name, srcpad, dst->filter->name, dstpad);
44 static int consume_whitespace(const char *buf)
46 return strspn(buf, " \n\t");
50 * Consumes a string from *buf.
51 * @return a copy of the consumed string, which should be free'd after use
53 static char *consume_string(const char **buf)
55 char *out = av_malloc(strlen(*buf) + 1);
58 *buf += consume_whitespace(*buf);
67 while(**buf && **buf != '\'')
87 *buf += consume_whitespace(*buf);
94 * @param name a pointer (that need to be free'd after use) to the name between
97 static char *parse_link_name(const char **buf, AVClass *log_ctx)
99 const char *start = *buf;
103 name = consume_string(buf);
106 av_log(log_ctx, AV_LOG_ERROR,
107 "Bad (empty?) label found in the following: \"%s\".\n", start);
111 if(*(*buf)++ != ']') {
112 av_log(log_ctx, AV_LOG_ERROR,
113 "Mismatched '[' found in the following: \"%s\".\n", start);
121 static AVFilterContext *create_filter(AVFilterGraph *ctx, int index,
122 const char *filt_name, const char *args,
125 AVFilterContext *filt_ctx;
130 snprintf(inst_name, sizeof(inst_name), "Parsed filter %d", index);
132 filt = avfilter_get_by_name(filt_name);
135 av_log(log_ctx, AV_LOG_ERROR,
136 "no such filter: '%s'\n", filt_name);
140 filt_ctx = avfilter_open(filt, inst_name);
142 av_log(log_ctx, AV_LOG_ERROR,
143 "error creating filter '%s'\n", filt_name);
147 if(avfilter_graph_add_filter(ctx, filt_ctx) < 0) {
148 avfilter_destroy(filt_ctx);
152 if(avfilter_init_filter(filt_ctx, args, NULL)) {
153 av_log(log_ctx, AV_LOG_ERROR,
154 "error initializing filter '%s' with args '%s'\n", filt_name, args);
162 * Parse "filter=params"
164 static AVFilterContext *parse_filter(const char **buf, AVFilterGraph *graph,
165 int index, AVClass *log_ctx)
168 char *name = consume_string(buf);
169 AVFilterContext *ret;
173 opts = consume_string(buf);
176 ret = create_filter(graph, index, name, opts, log_ctx);
182 static void free_inout(AVFilterInOut *head)
185 AVFilterInOut *next = head->next;
192 static AVFilterInOut *extract_inout(const char *label, AVFilterInOut **links)
196 while(*links && strcmp((*links)->name, label))
197 links = &((*links)->next);
207 static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element)
209 element->next = *inouts;
213 static int link_filter_inouts(AVFilterContext *filter,
214 AVFilterInOut **curr_inputs,
215 AVFilterInOut **open_inputs, AVClass *log_ctx)
217 int pad = filter->input_count;
220 AVFilterInOut *p = *curr_inputs;
222 av_log(log_ctx, AV_LOG_ERROR,
223 "Not enough inputs specified for the \"%s\" filter.\n",
224 filter->filter->name);
228 *curr_inputs = (*curr_inputs)->next;
231 if(link_filter(p->filter, p->pad_idx, filter, pad, log_ctx))
238 insert_inout(open_inputs, p);
243 av_log(log_ctx, AV_LOG_ERROR,
244 "Too many inputs specified for the \"%s\" filter.\n",
245 filter->filter->name);
249 pad = filter->output_count;
251 AVFilterInOut *currlinkn = av_mallocz(sizeof(AVFilterInOut));
252 currlinkn->filter = filter;
253 currlinkn->pad_idx = pad;
254 insert_inout(curr_inputs, currlinkn);
260 static int parse_inputs(const char **buf, AVFilterInOut **curr_inputs,
261 AVFilterInOut **open_outputs, AVClass *log_ctx)
265 while(**buf == '[') {
266 char *name = parse_link_name(buf, log_ctx);
267 AVFilterInOut *match;
272 /* First check if the label is not in the open_outputs list */
273 match = extract_inout(name, open_outputs);
278 /* Not in the list, so add it as an input */
279 match = av_mallocz(sizeof(AVFilterInOut));
281 match->pad_idx = pad;
284 insert_inout(curr_inputs, match);
286 *buf += consume_whitespace(*buf);
293 static int parse_outputs(const char **buf, AVFilterInOut **curr_inputs,
294 AVFilterInOut **open_inputs,
295 AVFilterInOut **open_outputs, AVClass *log_ctx)
299 while(**buf == '[') {
300 char *name = parse_link_name(buf, log_ctx);
301 AVFilterInOut *match;
303 AVFilterInOut *input = *curr_inputs;
304 *curr_inputs = (*curr_inputs)->next;
309 /* First check if the label is not in the open_inputs list */
310 match = extract_inout(name, open_inputs);
313 if(link_filter(input->filter, input->pad_idx,
314 match->filter, match->pad_idx, log_ctx) < 0)
316 av_free(match->name);
321 /* Not in the list, so add the first input as a open_output */
323 insert_inout(open_outputs, input);
325 *buf += consume_whitespace(*buf);
332 int avfilter_parse_graph(AVFilterGraph *graph, const char *filters,
333 AVFilterInOut *open_inputs,
334 AVFilterInOut *open_outputs, AVClass *log_ctx)
339 AVFilterInOut *curr_inputs = NULL;
342 AVFilterContext *filter;
343 filters += consume_whitespace(filters);
345 if(parse_inputs(&filters, &curr_inputs, &open_outputs, log_ctx) < 0)
348 filter = parse_filter(&filters, graph, index, log_ctx);
353 if(filter->input_count == 1 && !curr_inputs && !index) {
354 /* First input can be omitted if it is "[in]" */
355 const char *tmp = "[in]";
356 if(parse_inputs(&tmp, &curr_inputs, &open_outputs, log_ctx) < 0)
360 if(link_filter_inouts(filter, &curr_inputs, &open_inputs, log_ctx) < 0)
363 if(parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,
367 filters += consume_whitespace(filters);
370 if(chr == ';' && curr_inputs) {
371 av_log(log_ctx, AV_LOG_ERROR,
372 "Could not find a output to link when parsing \"%s\"\n",
377 } while(chr == ',' || chr == ';');
380 av_log(log_ctx, AV_LOG_ERROR,
381 "Unable to parse graph description substring: \"%s\"\n",
386 if(open_inputs && !strcmp(open_inputs->name, "out") && curr_inputs) {
387 /* Last output can be omitted if it is "[out]" */
388 const char *tmp = "[out]";
389 if(parse_outputs(&tmp, &curr_inputs, &open_inputs,
390 &open_outputs, log_ctx) < 0)
397 avfilter_destroy_graph(graph);
398 free_inout(open_inputs);
399 free_inout(open_outputs);
400 free_inout(curr_inputs);