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;
51 * Given the link between the dummy filter and an internal filter whose input
52 * is being exported outside the graph, this returns the externally visible
55 static inline AVFilterLink *get_extern_input_link(AVFilterLink *link)
57 GraphLinkContext *lctx = link->src->priv;
58 return lctx->graph->inputs[link->srcpad];
61 /** query the formats supported by a filter providing input to the graph */
62 static int *link_in_query_formats(AVFilterLink *link)
64 AVFilterLink *link2 = get_extern_input_link(link);
65 int *(*query_formats)(AVFilterLink *);
68 return avfilter_make_format_list(0);
70 if(!(query_formats = link2->src->output_pads[link2->srcpad].query_formats))
71 query_formats = avfilter_default_query_output_formats;
73 return query_formats(link2);
76 /** request a frame from a filter providing input to the graph */
77 static int link_in_request_frame(AVFilterLink *link)
79 AVFilterLink *link2 = get_extern_input_link(link);
83 return avfilter_request_frame(link2);
86 static int link_in_config_props(AVFilterLink *link)
88 AVFilterLink *link2 = get_extern_input_link(link);
89 int (*config_props)(AVFilterLink *);
94 if(!(config_props = link2->src->output_pads[link2->srcpad].config_props))
95 config_props = avfilter_default_config_output_link;
96 ret = config_props(link2);
105 * Given the link between the dummy filter and an internal filter whose input
106 * is being exported outside the graph, this returns the externally visible
109 static inline AVFilterLink *get_extern_output_link(AVFilterLink *link)
111 GraphLinkContext *lctx = link->dst->priv;
112 return lctx->graph->outputs[link->dstpad];
115 /** query the formats supported by a filter taking output from the graph */
116 static int *link_out_query_formats(AVFilterLink *link)
118 AVFilterLink *link2 = get_extern_output_link(link);
121 return avfilter_make_format_list(0);
123 return link2->dst->input_pads[link2->dstpad].query_formats(link2);
126 static int link_out_config_props(AVFilterLink *link)
128 AVFilterLink *link2 = get_extern_output_link(link);
129 int (*config_props)(AVFilterLink *);
137 if(!(config_props = link2->dst->input_pads[link2->dstpad].config_props))
138 config_props = avfilter_default_config_input_link;
139 return config_props(link2);
142 static void link_out_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
144 AVFilterLink *link2 = get_extern_output_link(link);
147 avfilter_unref_pic(picref);
149 avfilter_start_frame(link2, picref);
152 static void link_out_end_frame(AVFilterLink *link)
154 AVFilterLink *link2 = get_extern_output_link(link);
157 avfilter_end_frame(link2);
160 static AVFilterPicRef *link_out_get_video_buffer(AVFilterLink *link, int perms)
162 AVFilterLink *link2 = get_extern_output_link(link);
167 return avfilter_get_video_buffer(link2, perms);
170 static void link_out_draw_slice(AVFilterLink *link, int y, int height)
172 AVFilterLink *link2 = get_extern_output_link(link);
175 avfilter_draw_slice(link2, y, height);
178 /** dummy filter used to help export filters pads outside the graph */
179 static AVFilter vf_graph_dummy =
181 .name = "graph_dummy",
182 .author = "Bobby Bingham",
184 .priv_size = sizeof(GraphLinkContext),
189 .inputs = (AVFilterPad[]) {{ .name = NULL, }},
190 .outputs = (AVFilterPad[]) {{ .name = NULL, }},
193 static AVFilterLink *get_intern_input_link(AVFilterLink *link)
195 GraphContext *graph = link->dst->priv;
196 return graph->link_filter->outputs[link->dstpad];
199 static void graph_in_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
201 AVFilterLink *link2 = get_intern_input_link(link);
203 avfilter_start_frame(link2, picref);
206 static void graph_in_end_frame(AVFilterLink *link)
208 AVFilterLink *link2 = get_intern_input_link(link);
210 avfilter_end_frame(link2);
213 static AVFilterPicRef *graph_in_get_video_buffer(AVFilterLink *link, int perms)
215 AVFilterLink *link2 = get_intern_input_link(link);
217 return avfilter_get_video_buffer(link2, perms);
221 static void graph_in_draw_slice(AVFilterLink *link, int y, int height)
223 AVFilterLink *link2 = get_intern_input_link(link);
225 avfilter_draw_slice(link2, y, height);
228 static int *graph_in_query_formats(AVFilterLink *link)
230 AVFilterLink *link2 = get_intern_input_link(link);
232 if(!link2 || !link2->dst->input_pads[link2->dstpad].query_formats)
233 return avfilter_make_format_list(0);
234 return link2->dst->input_pads[link2->dstpad].query_formats(link2);
237 static int graph_in_config_props(AVFilterLink *link)
239 AVFilterLink *link2 = get_intern_input_link(link);
240 int (*config_props)(AVFilterLink *);
245 /* copy link properties over to the dummy internal link */
248 link2->format = link->format;
250 if(!(config_props = link2->dst->input_pads[link2->dstpad].config_props))
251 return 0; /* FIXME? */
252 //config_props = avfilter_default_config_input_link;
253 return config_props(link2);
256 static AVFilterLink *get_intern_output_link(AVFilterLink *link)
258 GraphContext *graph = link->src->priv;
259 return graph->link_filter->inputs[link->srcpad];
262 static int *graph_out_query_formats(AVFilterLink *link)
264 AVFilterLink *link2 = get_intern_output_link(link);
267 return avfilter_make_format_list(0);
268 if(!link2->src->output_pads[link2->srcpad].query_formats)
269 return avfilter_default_query_output_formats(link2);
270 return link2->src->output_pads[link2->srcpad].query_formats(link2);
273 static int graph_out_request_frame(AVFilterLink *link)
275 AVFilterLink *link2 = get_intern_output_link(link);
278 return avfilter_request_frame(link2);
282 static int graph_out_config_props(AVFilterLink *link)
284 AVFilterLink *link2 = get_intern_output_link(link);
285 int (*config_props)(AVFilterLink *);
293 link2->format = link->format;
295 if(!(config_props = link2->src->output_pads[link2->srcpad].config_props))
296 config_props = avfilter_default_config_output_link;
297 ret = config_props(link2);
301 link->format = link2->format;
306 static int add_graph_input(AVFilterContext *gctx, AVFilterContext *filt, unsigned idx,
309 GraphContext *graph = gctx->priv;
311 AVFilterPad graph_inpad =
314 .type = AV_PAD_VIDEO,
315 .start_frame = graph_in_start_frame,
316 .end_frame = graph_in_end_frame,
317 .get_video_buffer = graph_in_get_video_buffer,
318 .draw_slice = graph_in_draw_slice,
319 .query_formats = graph_in_query_formats,
320 .config_props = graph_in_config_props,
323 AVFilterPad dummy_outpad =
325 .name = NULL, /* FIXME? */
326 .type = AV_PAD_VIDEO,
327 .query_formats = link_in_query_formats,
328 .request_frame = link_in_request_frame,
329 .config_props = link_in_config_props,
332 avfilter_insert_inpad (gctx, gctx->input_count, &graph_inpad);
333 avfilter_insert_outpad(graph->link_filter, graph->link_filter->output_count,
335 return avfilter_link(graph->link_filter,
336 graph->link_filter->output_count-1, filt, idx);
339 static int add_graph_output(AVFilterContext *gctx, AVFilterContext *filt, unsigned idx,
342 GraphContext *graph = gctx->priv;
344 AVFilterPad graph_outpad =
347 .type = AV_PAD_VIDEO,
348 .request_frame = graph_out_request_frame,
349 .query_formats = graph_out_query_formats,
350 .config_props = graph_out_config_props,
352 AVFilterPad dummy_inpad =
354 .name = NULL, /* FIXME? */
355 .type = AV_PAD_VIDEO,
356 .start_frame = link_out_start_frame,
357 .end_frame = link_out_end_frame,
358 .draw_slice = link_out_draw_slice,
359 .get_video_buffer = link_out_get_video_buffer,
360 .query_formats = link_out_query_formats,
361 .config_props = link_out_config_props,
364 avfilter_insert_outpad(gctx, gctx->output_count, &graph_outpad);
365 avfilter_insert_inpad (graph->link_filter, graph->link_filter->input_count,
367 return avfilter_link(filt, idx, graph->link_filter,
368 graph->link_filter->input_count-1);
371 static void uninit(AVFilterContext *ctx)
373 GraphContext *graph = ctx->priv;
375 if(graph->link_filter) {
376 avfilter_destroy(graph->link_filter);
377 graph->link_filter = NULL;
379 for(; graph->filter_count > 0; graph->filter_count --)
380 avfilter_destroy(graph->filters[graph->filter_count - 1]);
381 av_freep(&graph->filters);
384 /* TODO: insert in sorted order */
385 void avfilter_graph_add_filter(AVFilterContext *graphctx, AVFilterContext *filter)
387 GraphContext *graph = graphctx->priv;
389 graph->filters = av_realloc(graph->filters,
390 sizeof(AVFilterContext*) * ++graph->filter_count);
391 graph->filters[graph->filter_count - 1] = filter;
394 /* search intelligently, once we insert in order */
395 AVFilterContext *avfilter_graph_get_filter(AVFilterContext *ctx, char *name)
397 GraphContext *graph = ctx->priv;
403 for(i = 0; i < graph->filter_count; i ++)
404 if(graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
405 return graph->filters[i];
410 int avfilter_graph_config_links(AVFilterContext *graphctx)
412 GraphContext *graph = graphctx->priv;
415 for(i = 0; i < graph->filter_count; i ++) {
416 for(j = 0; j < graph->filters[i]->input_count; j ++) {
417 /* ensure that graphs contained within graphs are configured */
418 if((graph->filters[i]->filter == &vf_graph ||
419 graph->filters[i]->filter == &vf_graphfile ||
420 graph->filters[i]->filter == &vf_graphdesc) &&
421 avfilter_graph_config_links(graph->filters[i]))
423 if(avfilter_config_link(graph->filters[i]->inputs[j]))
431 static AVFilterContext *create_filter_with_args(const char *filt, void *opaque)
433 AVFilterContext *ret;
434 char *filter = av_strdup(filt); /* copy - don't mangle the input string */
438 if((args = strchr(filter, '='))) {
439 /* ensure we at least have a name */
446 av_log(NULL, AV_LOG_INFO, "creating filter \"%s\" with args \"%s\"\n",
447 name, args ? args : "(none)");
449 if((ret = avfilter_create_by_name(name, NULL))) {
450 if(avfilter_init_filter(ret, args, opaque)) {
451 av_log(NULL, AV_LOG_ERROR, "error initializing filter!\n");
452 avfilter_destroy(ret);
455 } else av_log(NULL, AV_LOG_ERROR, "error creating filter!\n");
466 static int graph_load_chain(AVFilterContext *graphctx,
467 unsigned count, char **filter_list, void **opaque,
468 AVFilterContext **first, AVFilterContext **last)
471 AVFilterContext *filters[2] = {NULL,NULL};
473 for(i = 0; i < count; i ++) {
476 if(opaque) op = opaque[i];
479 if(!(filters[1] = create_filter_with_args(filter_list[i], op)))
482 if(first) *first = filters[1];
484 if(avfilter_link(filters[0], 0, filters[1], 0)) {
485 av_log(NULL, AV_LOG_ERROR, "error linking filters!\n");
489 avfilter_graph_add_filter(graphctx, filters[1]);
490 if(i == 0 && filters[1]->input_count > 0)
491 add_graph_input(graphctx, filters[1], 0, "default");
492 filters[0] = filters[1];
495 if(filters[1]->output_count > 0)
496 add_graph_output(graphctx, filters[1], 0, "default");
498 if(last) *last = filters[1];
503 if(first) *first = NULL;
504 if(last) *last = NULL;
508 static int graph_load_chain_from_string(AVFilterContext *ctx, const char *str,
509 AVFilterContext **first,
510 AVFilterContext **last)
516 strings = av_malloc(sizeof(char *));
517 strings[0] = av_strdup(str);
519 filt = strchr(strings[0], ',');
520 for(count = 1; filt; count ++) {
521 if(filt == strings[count-1]) {
526 strings = av_realloc(strings, sizeof(char *) * (count+1));
527 strings[count] = filt + 1;
529 filt = strchr(strings[count], ',');
532 ret = graph_load_chain(ctx, count, strings, NULL, first, last);
541 static int init(AVFilterContext *ctx, const char *args, void *opaque)
543 GraphContext *gctx = ctx->priv;
548 if(!(gctx->link_filter = avfilter_create(&vf_graph_dummy, NULL)))
550 if(avfilter_init_filter(gctx->link_filter, NULL, ctx))
553 return graph_load_chain_from_string(ctx, args, NULL, NULL);
556 avfilter_destroy(gctx->link_filter);
563 .author = "Bobby Bingham",
565 .priv_size = sizeof(GraphContext),
570 .inputs = (AVFilterPad[]) {{ .name = NULL, }},
571 .outputs = (AVFilterPad[]) {{ .name = NULL, }},
574 static int graph_load_from_desc(AVFilterContext *ctx, AVFilterGraphDesc *desc)
576 AVFilterGraphDescFilter *curfilt;
577 AVFilterGraphDescLink *curlink;
578 AVFilterGraphDescExport *curpad;
579 AVFilterContext *filt, *filtb;
581 /* create all filters */
582 for(curfilt = desc->filters; curfilt; curfilt = curfilt->next) {
583 if(!(filt = avfilter_create_by_name(curfilt->filter, curfilt->name))) {
584 av_log(ctx, AV_LOG_ERROR, "error creating filter\n");
587 avfilter_graph_add_filter(ctx, filt);
588 if(avfilter_init_filter(filt, curfilt->args, NULL)) {
589 av_log(ctx, AV_LOG_ERROR, "error initializing filter\n");
594 /* create all links */
595 for(curlink = desc->links; curlink; curlink = curlink->next) {
596 if(!(filt = avfilter_graph_get_filter(ctx, curlink->src))) {
597 av_log(ctx, AV_LOG_ERROR, "link source does not exist in graph\n");
600 if(!(filtb = avfilter_graph_get_filter(ctx, curlink->dst))) {
601 av_log(ctx, AV_LOG_ERROR, "link destination does not exist in graph\n");
604 if(avfilter_link(filt, curlink->srcpad, filtb, curlink->dstpad)) {
605 av_log(ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
610 /* export all input pads */
611 for(curpad = desc->inputs; curpad; curpad = curpad->next) {
612 if(!(filt = avfilter_graph_get_filter(ctx, curpad->filter))) {
613 av_log(ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
616 add_graph_input(ctx, filt, curpad->pad, curpad->name);
619 /* export all output pads */
620 for(curpad = desc->outputs; curpad; curpad = curpad->next) {
621 if(!(filt = avfilter_graph_get_filter(ctx, curpad->filter))) {
622 av_log(ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
625 add_graph_output(ctx, filt, curpad->pad, curpad->name);
635 static int init_desc(AVFilterContext *ctx, const char *args, void *opaque)
637 GraphContext *gctx = ctx->priv;
642 if(!(gctx->link_filter = avfilter_create(&vf_graph_dummy, NULL)))
644 if(avfilter_init_filter(gctx->link_filter, NULL, ctx))
647 return graph_load_from_desc(ctx, opaque);
650 avfilter_destroy(gctx->link_filter);
654 AVFilter vf_graphdesc =
656 .name = "graph_desc",
657 .author = "Bobby Bingham",
659 .priv_size = sizeof(GraphContext),
664 .inputs = (AVFilterPad[]) {{ .name = NULL, }},
665 .outputs = (AVFilterPad[]) {{ .name = NULL, }},
668 static int init_file(AVFilterContext *ctx, const char *args, void *opaque)
670 AVFilterGraphDesc *desc;
675 if(!(desc = avfilter_graph_load_desc(args)))
678 ret = init_desc(ctx, NULL, desc);
679 avfilter_graph_free_desc(desc);
683 AVFilter vf_graphfile =
685 .name = "graph_file",
686 .author = "Bobby Bingham",
688 .priv_size = sizeof(GraphContext),
693 .inputs = (AVFilterPad[]) {{ .name = NULL, }},
694 .outputs = (AVFilterPad[]) {{ .name = NULL, }},