3 * copyright (c) 2007 Bobby Bingham
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "avfiltergraph.h"
29 #include "allfilters.h"
31 typedef struct AVFilterGraph {
32 unsigned filter_count;
33 AVFilterContext **filters;
35 /** fake filter to handle links to internal filters */
36 AVFilterContext *link_filter;
40 AVFilterContext *graph;
43 static int link_init(AVFilterContext *ctx, const char *args, void *opaque)
45 GraphLinkContext *linkctx = ctx->priv;
46 linkctx->graph = opaque;
50 /* given the link between the dummy filter and an internal filter whose input
51 * is being exported outside the graph, this returns the externally visible
53 static inline AVFilterLink *get_extern_input_link(AVFilterLink *link)
55 GraphLinkContext *lctx = link->src->priv;
56 return lctx->graph->inputs[link->srcpad];
59 /** query the formats supported by a filter providing input to the graph */
60 static int *link_in_query_formats(AVFilterLink *link)
62 AVFilterLink *link2 = get_extern_input_link(link);
63 int *(*query_formats)(AVFilterLink *);
66 return avfilter_make_format_list(0);
68 if(!(query_formats = link2->src->output_pads[link2->srcpad].query_formats))
69 query_formats = avfilter_default_query_output_formats;
71 return query_formats(link2);
74 /** request a frame from a filter providing input to the graph */
75 static int link_in_request_frame(AVFilterLink *link)
77 AVFilterLink *link2 = get_extern_input_link(link);
81 return avfilter_request_frame(link2);
84 static int link_in_config_props(AVFilterLink *link)
86 AVFilterLink *link2 = get_extern_input_link(link);
87 int (*config_props)(AVFilterLink *);
92 if(!(config_props = link2->src->output_pads[link2->srcpad].config_props))
93 config_props = avfilter_default_config_output_link;
94 ret = config_props(link2);
102 /* given the link between the dummy filter and an internal filter whose input
103 * is being exported outside the graph, this returns the externally visible
105 static inline AVFilterLink *get_extern_output_link(AVFilterLink *link)
107 GraphLinkContext *lctx = link->dst->priv;
108 return lctx->graph->outputs[link->dstpad];
111 /** query the formats supported by a filter taking output from the graph */
112 static int *link_out_query_formats(AVFilterLink *link)
114 AVFilterLink *link2 = get_extern_output_link(link);
117 return avfilter_make_format_list(0);
119 return link2->dst->input_pads[link2->dstpad].query_formats(link2);
122 static int link_out_config_props(AVFilterLink *link)
124 AVFilterLink *link2 = get_extern_output_link(link);
125 int (*config_props)(AVFilterLink *);
133 if(!(config_props = link2->dst->input_pads[link2->dstpad].config_props))
134 config_props = avfilter_default_config_input_link;
135 return config_props(link2);
138 static void link_out_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
140 AVFilterLink *link2 = get_extern_output_link(link);
143 avfilter_unref_pic(picref);
145 avfilter_start_frame(link2, picref);
148 static void link_out_end_frame(AVFilterLink *link)
150 AVFilterLink *link2 = get_extern_output_link(link);
153 avfilter_end_frame(link2);
156 static AVFilterPicRef *link_out_get_video_buffer(AVFilterLink *link, int perms)
158 AVFilterLink *link2 = get_extern_output_link(link);
163 return avfilter_get_video_buffer(link2, perms);
166 static void link_out_draw_slice(AVFilterLink *link, int y, int height)
168 AVFilterLink *link2 = get_extern_output_link(link);
171 avfilter_draw_slice(link2, y, height);
174 /** dummy filter used to help export filters pads outside the graph */
175 static AVFilter vf_graph_dummy =
177 .name = "graph_dummy",
178 .author = "Bobby Bingham",
180 .priv_size = sizeof(GraphLinkContext),
185 .inputs = (AVFilterPad[]) {{ .name = NULL, }},
186 .outputs = (AVFilterPad[]) {{ .name = NULL, }},
189 static AVFilterLink *get_intern_input_link(AVFilterLink *link)
191 GraphContext *graph = link->dst->priv;
192 return graph->link_filter->outputs[link->dstpad];
195 static void graph_in_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
197 AVFilterLink *link2 = get_intern_input_link(link);
199 avfilter_start_frame(link2, picref);
202 static void graph_in_end_frame(AVFilterLink *link)
204 AVFilterLink *link2 = get_intern_input_link(link);
206 avfilter_end_frame(link2);
209 static AVFilterPicRef *graph_in_get_video_buffer(AVFilterLink *link, int perms)
211 AVFilterLink *link2 = get_intern_input_link(link);
213 return avfilter_get_video_buffer(link2, perms);
217 static void graph_in_draw_slice(AVFilterLink *link, int y, int height)
219 AVFilterLink *link2 = get_intern_input_link(link);
221 avfilter_draw_slice(link2, y, height);
224 static int *graph_in_query_formats(AVFilterLink *link)
226 AVFilterLink *link2 = get_intern_input_link(link);
228 if(!link2 || !link2->dst->input_pads[link2->dstpad].query_formats)
229 return avfilter_make_format_list(0);
230 return link2->dst->input_pads[link2->dstpad].query_formats(link2);
233 static int graph_in_config_props(AVFilterLink *link)
235 AVFilterLink *link2 = get_intern_input_link(link);
236 int (*config_props)(AVFilterLink *);
241 /* copy link properties over to the dummy internal link */
244 link2->format = link->format;
246 if(!(config_props = link2->dst->input_pads[link2->dstpad].config_props))
247 return 0; /* FIXME? */
248 //config_props = avfilter_default_config_input_link;
249 return config_props(link2);
252 static AVFilterLink *get_intern_output_link(AVFilterLink *link)
254 GraphContext *graph = link->src->priv;
255 return graph->link_filter->inputs[link->srcpad];
258 static int *graph_out_query_formats(AVFilterLink *link)
260 AVFilterLink *link2 = get_intern_output_link(link);
263 return avfilter_make_format_list(0);
264 if(!link2->src->output_pads[link2->srcpad].query_formats)
265 return avfilter_default_query_output_formats(link2);
266 return link2->src->output_pads[link2->srcpad].query_formats(link2);
269 static int graph_out_request_frame(AVFilterLink *link)
271 AVFilterLink *link2 = get_intern_output_link(link);
274 return avfilter_request_frame(link2);
278 static int graph_out_config_props(AVFilterLink *link)
280 AVFilterLink *link2 = get_intern_output_link(link);
281 int (*config_props)(AVFilterLink *);
289 link2->format = link->format;
291 if(!(config_props = link2->src->output_pads[link2->srcpad].config_props))
292 config_props = avfilter_default_config_output_link;
293 ret = config_props(link2);
297 link->format = link2->format;
302 static int add_graph_input(AVFilterContext *gctx, AVFilterContext *filt, unsigned idx,
305 GraphContext *graph = gctx->priv;
307 AVFilterPad graph_inpad =
310 .type = AV_PAD_VIDEO,
311 .start_frame = graph_in_start_frame,
312 .end_frame = graph_in_end_frame,
313 .get_video_buffer = graph_in_get_video_buffer,
314 .draw_slice = graph_in_draw_slice,
315 .query_formats = graph_in_query_formats,
316 .config_props = graph_in_config_props,
319 AVFilterPad dummy_outpad =
321 .name = NULL, /* FIXME? */
322 .type = AV_PAD_VIDEO,
323 .query_formats = link_in_query_formats,
324 .request_frame = link_in_request_frame,
325 .config_props = link_in_config_props,
328 avfilter_insert_inpad (gctx, gctx->input_count, &graph_inpad);
329 avfilter_insert_outpad(graph->link_filter, graph->link_filter->output_count,
331 return avfilter_link(graph->link_filter,
332 graph->link_filter->output_count-1, filt, idx);
335 static int add_graph_output(AVFilterContext *gctx, AVFilterContext *filt, unsigned idx,
338 GraphContext *graph = gctx->priv;
340 AVFilterPad graph_outpad =
343 .type = AV_PAD_VIDEO,
344 .request_frame = graph_out_request_frame,
345 .query_formats = graph_out_query_formats,
346 .config_props = graph_out_config_props,
348 AVFilterPad dummy_inpad =
350 .name = NULL, /* FIXME? */
351 .type = AV_PAD_VIDEO,
352 .start_frame = link_out_start_frame,
353 .end_frame = link_out_end_frame,
354 .draw_slice = link_out_draw_slice,
355 .get_video_buffer = link_out_get_video_buffer,
356 .query_formats = link_out_query_formats,
357 .config_props = link_out_config_props,
360 avfilter_insert_outpad(gctx, gctx->output_count, &graph_outpad);
361 avfilter_insert_inpad (graph->link_filter, graph->link_filter->input_count,
363 return avfilter_link(filt, idx, graph->link_filter,
364 graph->link_filter->input_count-1);
367 static void uninit(AVFilterContext *ctx)
369 GraphContext *graph = ctx->priv;
371 if(graph->link_filter) {
372 avfilter_destroy(graph->link_filter);
373 graph->link_filter = NULL;
375 for(; graph->filter_count > 0; graph->filter_count --)
376 avfilter_destroy(graph->filters[graph->filter_count - 1]);
377 av_freep(&graph->filters);
380 /* TODO: insert in sorted order */
381 void avfilter_graph_add_filter(AVFilterContext *graphctx, AVFilterContext *filter)
383 GraphContext *graph = graphctx->priv;
385 graph->filters = av_realloc(graph->filters,
386 sizeof(AVFilterContext*) * ++graph->filter_count);
387 graph->filters[graph->filter_count - 1] = filter;
390 /* search intelligently, once we insert in order */
391 AVFilterContext *avfilter_graph_get_filter(AVFilterContext *ctx, char *name)
393 GraphContext *graph = ctx->priv;
399 for(i = 0; i < graph->filter_count; i ++)
400 if(graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
401 return graph->filters[i];
406 int avfilter_graph_config_links(AVFilterContext *graphctx)
408 GraphContext *graph = graphctx->priv;
411 for(i = 0; i < graph->filter_count; i ++) {
412 for(j = 0; j < graph->filters[i]->input_count; j ++) {
413 /* ensure that graphs contained within graphs are configured */
414 if((graph->filters[i]->filter == &vf_graph ||
415 graph->filters[i]->filter == &vf_graphfile ||
416 graph->filters[i]->filter == &vf_graphdesc) &&
417 avfilter_graph_config_links(graph->filters[i]))
419 if(avfilter_config_link(graph->filters[i]->inputs[j]))
427 static AVFilterContext *create_filter_with_args(const char *filt, void *opaque)
429 AVFilterContext *ret;
430 char *filter = av_strdup(filt); /* copy - don't mangle the input string */
434 if((args = strchr(filter, '='))) {
435 /* ensure we at least have a name */
442 av_log(NULL, AV_LOG_INFO, "creating filter \"%s\" with args \"%s\"\n",
443 name, args ? args : "(none)");
445 if((ret = avfilter_create_by_name(name, NULL))) {
446 if(avfilter_init_filter(ret, args, opaque)) {
447 av_log(NULL, AV_LOG_ERROR, "error initializing filter!\n");
448 avfilter_destroy(ret);
451 } else av_log(NULL, AV_LOG_ERROR, "error creating filter!\n");
462 static int graph_load_chain(AVFilterContext *graphctx,
463 unsigned count, char **filter_list, void **opaque,
464 AVFilterContext **first, AVFilterContext **last)
467 AVFilterContext *filters[2] = {NULL,NULL};
469 for(i = 0; i < count; i ++) {
472 if(opaque) op = opaque[i];
475 if(!(filters[1] = create_filter_with_args(filter_list[i], op)))
478 if(first) *first = filters[1];
480 if(avfilter_link(filters[0], 0, filters[1], 0)) {
481 av_log(NULL, AV_LOG_ERROR, "error linking filters!\n");
485 avfilter_graph_add_filter(graphctx, filters[1]);
486 if(i == 0 && filters[1]->input_count > 0)
487 add_graph_input(graphctx, filters[1], 0, "default");
488 filters[0] = filters[1];
491 if(filters[1]->output_count > 0)
492 add_graph_output(graphctx, filters[1], 0, "default");
494 if(last) *last = filters[1];
499 if(first) *first = NULL;
500 if(last) *last = NULL;
504 static int graph_load_chain_from_string(AVFilterContext *ctx, const char *str,
505 AVFilterContext **first,
506 AVFilterContext **last)
512 strings = av_malloc(sizeof(char *));
513 strings[0] = av_strdup(str);
515 filt = strchr(strings[0], ',');
516 for(count = 1; filt; count ++) {
517 if(filt == strings[count-1]) {
522 strings = av_realloc(strings, sizeof(char *) * (count+1));
523 strings[count] = filt + 1;
525 filt = strchr(strings[count], ',');
528 ret = graph_load_chain(ctx, count, strings, NULL, first, last);
537 static int init(AVFilterContext *ctx, const char *args, void *opaque)
539 GraphContext *gctx = ctx->priv;
544 if(!(gctx->link_filter = avfilter_create(&vf_graph_dummy, NULL)))
546 if(avfilter_init_filter(gctx->link_filter, NULL, ctx))
549 return graph_load_chain_from_string(ctx, args, NULL, NULL);
552 avfilter_destroy(gctx->link_filter);
559 .author = "Bobby Bingham",
561 .priv_size = sizeof(GraphContext),
566 .inputs = (AVFilterPad[]) {{ .name = NULL, }},
567 .outputs = (AVFilterPad[]) {{ .name = NULL, }},
570 static int graph_load_from_desc(AVFilterContext *ctx, AVFilterGraphDesc *desc)
572 AVFilterGraphDescFilter *curfilt;
573 AVFilterGraphDescLink *curlink;
574 AVFilterGraphDescExport *curpad;
575 AVFilterContext *filt, *filtb;
577 /* create all filters */
578 for(curfilt = desc->filters; curfilt; curfilt = curfilt->next) {
579 if(!(filt = avfilter_create_by_name(curfilt->filter, curfilt->name))) {
580 av_log(ctx, AV_LOG_ERROR, "error creating filter\n");
583 avfilter_graph_add_filter(ctx, filt);
584 if(avfilter_init_filter(filt, curfilt->args, NULL)) {
585 av_log(ctx, AV_LOG_ERROR, "error initializing filter\n");
590 /* create all links */
591 for(curlink = desc->links; curlink; curlink = curlink->next) {
592 if(!(filt = avfilter_graph_get_filter(ctx, curlink->src))) {
593 av_log(ctx, AV_LOG_ERROR, "link source does not exist in graph\n");
596 if(!(filtb = avfilter_graph_get_filter(ctx, curlink->dst))) {
597 av_log(ctx, AV_LOG_ERROR, "link destination does not exist in graph\n");
600 if(avfilter_link(filt, curlink->srcpad, filtb, curlink->dstpad)) {
601 av_log(ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
606 /* export all input pads */
607 for(curpad = desc->inputs; curpad; curpad = curpad->next) {
608 if(!(filt = avfilter_graph_get_filter(ctx, curpad->filter))) {
609 av_log(ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
612 add_graph_input(ctx, filt, curpad->pad, curpad->name);
615 /* export all output pads */
616 for(curpad = desc->outputs; curpad; curpad = curpad->next) {
617 if(!(filt = avfilter_graph_get_filter(ctx, curpad->filter))) {
618 av_log(ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
621 add_graph_output(ctx, filt, curpad->pad, curpad->name);
631 static int init_desc(AVFilterContext *ctx, const char *args, void *opaque)
633 GraphContext *gctx = ctx->priv;
638 if(!(gctx->link_filter = avfilter_create(&vf_graph_dummy, NULL)))
640 if(avfilter_init_filter(gctx->link_filter, NULL, ctx))
643 return graph_load_from_desc(ctx, opaque);
646 avfilter_destroy(gctx->link_filter);
650 AVFilter vf_graphdesc =
652 .name = "graph_desc",
653 .author = "Bobby Bingham",
655 .priv_size = sizeof(GraphContext),
660 .inputs = (AVFilterPad[]) {{ .name = NULL, }},
661 .outputs = (AVFilterPad[]) {{ .name = NULL, }},
664 static int init_file(AVFilterContext *ctx, const char *args, void *opaque)
666 AVFilterGraphDesc *desc;
671 if(!(desc = avfilter_graph_load_desc(args)))
674 ret = init_desc(ctx, NULL, desc);
675 avfilter_graph_free_desc(desc);
679 AVFilter vf_graphfile =
681 .name = "graph_file",
682 .author = "Bobby Bingham",
684 .priv_size = sizeof(GraphContext),
689 .inputs = (AVFilterPad[]) {{ .name = NULL, }},
690 .outputs = (AVFilterPad[]) {{ .name = NULL, }},