Set graph swscale opts before parsing it, that way opts are available
[libav.git] / libavfilter / graphparser.c
CommitLineData
27afb09d
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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 <ctype.h>
24#include <string.h>
25
6a0c770b 26#include "graphparser.h"
27afb09d
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27#include "avfilter.h"
28#include "avfiltergraph.h"
dd04911c 29#include "parseutils.h"
27afb09d 30
fd548e5b
SS
31#define WHITESPACES " \n\t"
32
9710beaf 33static int link_filter(AVFilterContext *src, int srcpad,
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34 AVFilterContext *dst, int dstpad,
35 AVClass *log_ctx)
27afb09d 36{
9710beaf 37 if(avfilter_link(src, srcpad, dst, dstpad)) {
3a70bb2d 38 av_log(log_ctx, AV_LOG_ERROR,
9710beaf
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39 "cannot create the link %s:%d -> %s:%d\n",
40 src->filter->name, srcpad, dst->filter->name, dstpad);
27afb09d
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41 return -1;
42 }
43
44 return 0;
45}
46
27afb09d 47/**
ffac8784 48 * Parse "[linkname]"
69fa7e80
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49 * @param name a pointer (that need to be free'd after use) to the name between
50 * parenthesis
27afb09d 51 */
bd80b349 52static char *parse_link_name(const char **buf, AVClass *log_ctx)
27afb09d 53{
22260824 54 const char *start = *buf;
bd80b349 55 char *name;
27afb09d
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56 (*buf)++;
57
dd04911c 58 name = av_get_token(buf, "]");
27afb09d 59
bd80b349 60 if(!name[0]) {
3a70bb2d 61 av_log(log_ctx, AV_LOG_ERROR,
22260824 62 "Bad (empty?) label found in the following: \"%s\".\n", start);
27afb09d 63 goto fail;
22260824 64 }
27afb09d 65
22260824 66 if(*(*buf)++ != ']') {
3a70bb2d 67 av_log(log_ctx, AV_LOG_ERROR,
22260824 68 "Mismatched '[' found in the following: \"%s\".\n", start);
85cb8af7 69 fail:
bd80b349 70 av_freep(&name);
22260824 71 }
bd80b349
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72
73 return name;
27afb09d
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74}
75
8e74c889 76static AVFilterContext *create_filter(AVFilterGraph *ctx, int index,
e4a5f397 77 const char *filt_name, const char *args,
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78 AVClass *log_ctx)
79{
e4a5f397 80 AVFilterContext *filt_ctx;
8e74c889 81
e4a5f397 82 AVFilter *filt;
8e74c889
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83 char inst_name[30];
84
03c3bb5c 85 snprintf(inst_name, sizeof(inst_name), "Filter %d %s", index, filt_name);
8e74c889 86
e4a5f397 87 filt = avfilter_get_by_name(filt_name);
5e600185 88
e4a5f397 89 if(!filt) {
8e74c889 90 av_log(log_ctx, AV_LOG_ERROR,
e4a5f397 91 "no such filter: '%s'\n", filt_name);
8e74c889
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92 return NULL;
93 }
94
e4a5f397
SS
95 filt_ctx = avfilter_open(filt, inst_name);
96 if(!filt_ctx) {
8e74c889 97 av_log(log_ctx, AV_LOG_ERROR,
e4a5f397 98 "error creating filter '%s'\n", filt_name);
8e74c889
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99 return NULL;
100 }
101
e4a5f397
SS
102 if(avfilter_graph_add_filter(ctx, filt_ctx) < 0) {
103 avfilter_destroy(filt_ctx);
8e74c889 104 return NULL;
64b164f4 105 }
8e74c889 106
e4a5f397 107 if(avfilter_init_filter(filt_ctx, args, NULL)) {
8e74c889 108 av_log(log_ctx, AV_LOG_ERROR,
e4a5f397 109 "error initializing filter '%s' with args '%s'\n", filt_name, args);
8e74c889
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110 return NULL;
111 }
112
e4a5f397 113 return filt_ctx;
8e74c889
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114}
115
f5cbde2e
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116/**
117 * Parse "filter=params"
f5cbde2e
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118 */
119static AVFilterContext *parse_filter(const char **buf, AVFilterGraph *graph,
120 int index, AVClass *log_ctx)
121{
ba3fed2f 122 char *opts = NULL;
15a316c0 123 char *name = av_get_token(buf, "=,;[\n");
64b164f4 124 AVFilterContext *ret;
f5cbde2e 125
12849837 126 if(**buf == '=') {
f5cbde2e 127 (*buf)++;
15a316c0 128 opts = av_get_token(buf, "[],;\n");
12849837 129 }
f5cbde2e 130
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131 ret = create_filter(graph, index, name, opts, log_ctx);
132 av_free(name);
133 av_free(opts);
134 return ret;
f5cbde2e
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135}
136
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137static void free_inout(AVFilterInOut *head)
138{
487c0e67 139 while(head) {
55672c83 140 AVFilterInOut *next = head->next;
64b164f4 141 av_free(head->name);
27afb09d
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142 av_free(head);
143 head = next;
144 }
145}
146
c9987633
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147static AVFilterInOut *extract_inout(const char *label, AVFilterInOut **links)
148{
149 AVFilterInOut *ret;
c9987633 150
fec2e513 151 while(*links && strcmp((*links)->name, label))
f6557d5e 152 links = &((*links)->next);
c9987633 153
f6557d5e 154 ret = *links;
c9987633 155
fec2e513 156 if(ret)
f6557d5e 157 *links = ret->next;
c9987633
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158
159 return ret;
160}
161
e97908ee
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162static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element)
163{
164 element->next = *inouts;
165 *inouts = element;
166}
c9987633
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167
168static int link_filter_inouts(AVFilterContext *filter,
7f9b3266
SS
169 AVFilterInOut **curr_inputs,
170 AVFilterInOut **open_inputs, AVClass *log_ctx)
c9987633 171{
90ed076c 172 int pad = filter->input_count;
c9987633 173
4fd9d074 174 while(pad--) {
7f9b3266 175 AVFilterInOut *p = *curr_inputs;
c9987633
VS
176 if(!p) {
177 av_log(log_ctx, AV_LOG_ERROR,
178 "Not enough inputs specified for the \"%s\" filter.\n",
089d3714 179 filter->filter->name);
c9987633
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180 return -1;
181 }
182
7f9b3266 183 *curr_inputs = (*curr_inputs)->next;
4d11beb2 184
c9987633
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185 if(p->filter) {
186 if(link_filter(p->filter, p->pad_idx, filter, pad, log_ctx))
187 return -1;
64b164f4 188 av_free(p->name);
c9987633
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189 av_free(p);
190 } else {
c9987633
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191 p->filter = filter;
192 p->pad_idx = pad;
7f9b3266 193 insert_inout(open_inputs, p);
c9987633
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194 }
195 }
196
7f9b3266 197 if(*curr_inputs) {
c9987633
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198 av_log(log_ctx, AV_LOG_ERROR,
199 "Too many inputs specified for the \"%s\" filter.\n",
089d3714 200 filter->filter->name);
c9987633
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201 return -1;
202 }
203
204 pad = filter->output_count;
4fd9d074 205 while(pad--) {
c956dd43 206 AVFilterInOut *currlinkn = av_mallocz(sizeof(AVFilterInOut));
c9987633
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207 currlinkn->filter = filter;
208 currlinkn->pad_idx = pad;
7f9b3266 209 insert_inout(curr_inputs, currlinkn);
c9987633
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210 }
211
212 return 0;
213}
214
7f9b3266
SS
215static int parse_inputs(const char **buf, AVFilterInOut **curr_inputs,
216 AVFilterInOut **open_outputs, AVClass *log_ctx)
27afb09d 217{
c9987633 218 int pad = 0;
c9987633 219
487c0e67 220 while(**buf == '[') {
bd80b349 221 char *name = parse_link_name(buf, log_ctx);
b2ac16da 222 AVFilterInOut *match;
22260824 223
a4501887 224 if(!name)
22260824 225 return -1;
22260824 226
7f9b3266
SS
227 /* First check if the label is not in the open_outputs list */
228 match = extract_inout(name, open_outputs);
cf4f7d38 229
b2ac16da 230 if(match) {
64fbf5e2 231 av_free(name);
0de3407b
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232 } else {
233 /* Not in the list, so add it as an input */
c880791f
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234 match = av_mallocz(sizeof(AVFilterInOut));
235 match->name = name;
c880791f 236 match->pad_idx = pad;
cf4f7d38 237 }
e97908ee 238
7f9b3266 239 insert_inout(curr_inputs, match);
e97908ee 240
fd548e5b 241 *buf += strspn(*buf, WHITESPACES);
c9987633 242 pad++;
27afb09d 243 }
cf4f7d38 244
27afb09d
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245 return pad;
246}
247
7f9b3266
SS
248static int parse_outputs(const char **buf, AVFilterInOut **curr_inputs,
249 AVFilterInOut **open_inputs,
250 AVFilterInOut **open_outputs, AVClass *log_ctx)
9710beaf 251{
c9987633
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252 int pad = 0;
253
487c0e67 254 while(**buf == '[') {
bd80b349 255 char *name = parse_link_name(buf, log_ctx);
c9987633
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256 AVFilterInOut *match;
257
7f9b3266
SS
258 AVFilterInOut *input = *curr_inputs;
259 *curr_inputs = (*curr_inputs)->next;
443c10ef 260
c9987633
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261 if(!name)
262 return -1;
263
7f9b3266
SS
264 /* First check if the label is not in the open_inputs list */
265 match = extract_inout(name, open_inputs);
c9987633 266
0de3407b 267 if(match) {
7baa6210 268 if(link_filter(input->filter, input->pad_idx,
c9987633
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269 match->filter, match->pad_idx, log_ctx) < 0)
270 return -1;
64b164f4
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271 av_free(match->name);
272 av_free(name);
c9987633 273 av_free(match);
7baa6210 274 av_free(input);
0de3407b 275 } else {
7f9b3266 276 /* Not in the list, so add the first input as a open_output */
7baa6210 277 input->name = name;
7f9b3266 278 insert_inout(open_outputs, input);
c9987633 279 }
fd548e5b 280 *buf += strspn(*buf, WHITESPACES);
c9987633 281 pad++;
8095a014 282 }
9710beaf 283
c9987633
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284 return pad;
285}
9710beaf 286
86a47378 287int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
7f9b3266
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288 AVFilterInOut *open_inputs,
289 AVFilterInOut *open_outputs, AVClass *log_ctx)
27afb09d 290{
27afb09d
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291 int index = 0;
292 char chr = 0;
27afb09d 293
7f9b3266 294 AVFilterInOut *curr_inputs = NULL;
27afb09d 295
27afb09d 296 do {
9710beaf 297 AVFilterContext *filter;
fd548e5b 298 filters += strspn(filters, WHITESPACES);
27afb09d 299
7f9b3266 300 if(parse_inputs(&filters, &curr_inputs, &open_outputs, log_ctx) < 0)
27afb09d
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301 goto fail;
302
5e600185
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303 filter = parse_filter(&filters, graph, index, log_ctx);
304
305 if(!filter)
22260824
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306 goto fail;
307
7f9b3266 308 if(filter->input_count == 1 && !curr_inputs && !index) {
e916c2ac 309 /* First input can be omitted if it is "[in]" */
c9987633 310 const char *tmp = "[in]";
7f9b3266 311 if(parse_inputs(&tmp, &curr_inputs, &open_outputs, log_ctx) < 0)
27afb09d 312 goto fail;
27afb09d
VS
313 }
314
7f9b3266 315 if(link_filter_inouts(filter, &curr_inputs, &open_inputs, log_ctx) < 0)
c9987633 316 goto fail;
da790674 317
7f9b3266 318 if(parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,
e2b5fdaf 319 log_ctx) < 0)
e84f0b62
VS
320 goto fail;
321
fd548e5b 322 filters += strspn(filters, WHITESPACES);
27afb09d 323 chr = *filters++;
27afb09d 324
7f9b3266 325 if(chr == ';' && curr_inputs) {
c9987633
VS
326 av_log(log_ctx, AV_LOG_ERROR,
327 "Could not find a output to link when parsing \"%s\"\n",
328 filters - 1);
329 goto fail;
27afb09d 330 }
c9987633 331 index++;
487c0e67 332 } while(chr == ',' || chr == ';');
27afb09d 333
fd51ff16 334 if (chr) {
78471234
SS
335 av_log(log_ctx, AV_LOG_ERROR,
336 "Unable to parse graph description substring: \"%s\"\n",
337 filters - 1);
338 goto fail;
339 }
340
7f9b3266 341 if(open_inputs && !strcmp(open_inputs->name, "out") && curr_inputs) {
e916c2ac 342 /* Last output can be omitted if it is "[out]" */
c9987633 343 const char *tmp = "[out]";
7f9b3266
SS
344 if(parse_outputs(&tmp, &curr_inputs, &open_inputs,
345 &open_outputs, log_ctx) < 0)
27afb09d 346 goto fail;
27afb09d
VS
347 }
348
349 return 0;
350
351 fail:
d7dbe558 352 avfilter_graph_destroy(graph);
7f9b3266
SS
353 free_inout(open_inputs);
354 free_inout(open_outputs);
355 free_inout(curr_inputs);
27afb09d
VS
356 return -1;
357}