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"
29 #include "parseutils.h"
31 #define WHITESPACES " \n\t"
33 static int link_filter(AVFilterContext *src, int srcpad,
34 AVFilterContext *dst, int dstpad,
37 if(avfilter_link(src, srcpad, dst, dstpad)) {
38 av_log(log_ctx, AV_LOG_ERROR,
39 "cannot create the link %s:%d -> %s:%d\n",
40 src->filter->name, srcpad, dst->filter->name, dstpad);
49 * @param name a pointer (that need to be free'd after use) to the name between
52 static char *parse_link_name(const char **buf, AVClass *log_ctx)
54 const char *start = *buf;
58 name = av_get_token(buf, "]");
61 av_log(log_ctx, AV_LOG_ERROR,
62 "Bad (empty?) label found in the following: \"%s\".\n", start);
66 if(*(*buf)++ != ']') {
67 av_log(log_ctx, AV_LOG_ERROR,
68 "Mismatched '[' found in the following: \"%s\".\n", start);
76 static AVFilterContext *create_filter(AVFilterGraph *ctx, int index,
77 const char *filt_name, const char *args,
80 AVFilterContext *filt_ctx;
85 snprintf(inst_name, sizeof(inst_name), "Parsed filter %d", index);
87 filt = avfilter_get_by_name(filt_name);
90 av_log(log_ctx, AV_LOG_ERROR,
91 "no such filter: '%s'\n", filt_name);
95 filt_ctx = avfilter_open(filt, inst_name);
97 av_log(log_ctx, AV_LOG_ERROR,
98 "error creating filter '%s'\n", filt_name);
102 if(avfilter_graph_add_filter(ctx, filt_ctx) < 0) {
103 avfilter_destroy(filt_ctx);
107 if(avfilter_init_filter(filt_ctx, args, NULL)) {
108 av_log(log_ctx, AV_LOG_ERROR,
109 "error initializing filter '%s' with args '%s'\n", filt_name, args);
117 * Parse "filter=params"
119 static AVFilterContext *parse_filter(const char **buf, AVFilterGraph *graph,
120 int index, AVClass *log_ctx)
123 char *name = av_get_token(buf, "=,;[\n");
124 AVFilterContext *ret;
128 opts = av_get_token(buf, "[],;\n");
131 ret = create_filter(graph, index, name, opts, log_ctx);
137 static void free_inout(AVFilterInOut *head)
140 AVFilterInOut *next = head->next;
147 static AVFilterInOut *extract_inout(const char *label, AVFilterInOut **links)
151 while(*links && strcmp((*links)->name, label))
152 links = &((*links)->next);
162 static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element)
164 element->next = *inouts;
168 static int link_filter_inouts(AVFilterContext *filter,
169 AVFilterInOut **curr_inputs,
170 AVFilterInOut **open_inputs, AVClass *log_ctx)
172 int pad = filter->input_count;
175 AVFilterInOut *p = *curr_inputs;
177 av_log(log_ctx, AV_LOG_ERROR,
178 "Not enough inputs specified for the \"%s\" filter.\n",
179 filter->filter->name);
183 *curr_inputs = (*curr_inputs)->next;
186 if(link_filter(p->filter, p->pad_idx, filter, pad, log_ctx))
193 insert_inout(open_inputs, p);
198 av_log(log_ctx, AV_LOG_ERROR,
199 "Too many inputs specified for the \"%s\" filter.\n",
200 filter->filter->name);
204 pad = filter->output_count;
206 AVFilterInOut *currlinkn = av_mallocz(sizeof(AVFilterInOut));
207 currlinkn->filter = filter;
208 currlinkn->pad_idx = pad;
209 insert_inout(curr_inputs, currlinkn);
215 static int parse_inputs(const char **buf, AVFilterInOut **curr_inputs,
216 AVFilterInOut **open_outputs, AVClass *log_ctx)
220 while(**buf == '[') {
221 char *name = parse_link_name(buf, log_ctx);
222 AVFilterInOut *match;
227 /* First check if the label is not in the open_outputs list */
228 match = extract_inout(name, open_outputs);
233 /* Not in the list, so add it as an input */
234 match = av_mallocz(sizeof(AVFilterInOut));
236 match->pad_idx = pad;
239 insert_inout(curr_inputs, match);
241 *buf += strspn(*buf, WHITESPACES);
248 static int parse_outputs(const char **buf, AVFilterInOut **curr_inputs,
249 AVFilterInOut **open_inputs,
250 AVFilterInOut **open_outputs, AVClass *log_ctx)
254 while(**buf == '[') {
255 char *name = parse_link_name(buf, log_ctx);
256 AVFilterInOut *match;
258 AVFilterInOut *input = *curr_inputs;
259 *curr_inputs = (*curr_inputs)->next;
264 /* First check if the label is not in the open_inputs list */
265 match = extract_inout(name, open_inputs);
268 if(link_filter(input->filter, input->pad_idx,
269 match->filter, match->pad_idx, log_ctx) < 0)
271 av_free(match->name);
276 /* Not in the list, so add the first input as a open_output */
278 insert_inout(open_outputs, input);
280 *buf += strspn(*buf, WHITESPACES);
287 int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
288 AVFilterInOut *open_inputs,
289 AVFilterInOut *open_outputs, AVClass *log_ctx)
294 AVFilterInOut *curr_inputs = NULL;
297 AVFilterContext *filter;
298 filters += strspn(filters, WHITESPACES);
300 if(parse_inputs(&filters, &curr_inputs, &open_outputs, log_ctx) < 0)
303 filter = parse_filter(&filters, graph, index, log_ctx);
308 if(filter->input_count == 1 && !curr_inputs && !index) {
309 /* First input can be omitted if it is "[in]" */
310 const char *tmp = "[in]";
311 if(parse_inputs(&tmp, &curr_inputs, &open_outputs, log_ctx) < 0)
315 if(link_filter_inouts(filter, &curr_inputs, &open_inputs, log_ctx) < 0)
318 if(parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,
322 filters += strspn(filters, WHITESPACES);
325 if(chr == ';' && curr_inputs) {
326 av_log(log_ctx, AV_LOG_ERROR,
327 "Could not find a output to link when parsing \"%s\"\n",
332 } while(chr == ',' || chr == ';');
335 av_log(log_ctx, AV_LOG_ERROR,
336 "Unable to parse graph description substring: \"%s\"\n",
341 if(open_inputs && !strcmp(open_inputs->name, "out") && curr_inputs) {
342 /* Last output can be omitted if it is "[out]" */
343 const char *tmp = "[out]";
344 if(parse_outputs(&tmp, &curr_inputs, &open_inputs,
345 &open_outputs, log_ctx) < 0)
352 avfilter_graph_destroy(graph);
353 free_inout(open_inputs);
354 free_inout(open_outputs);
355 free_inout(curr_inputs);