2008-04-04 20:02:10 +00:00
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/*
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2008-04-04 20:08:05 +00:00
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* filter graphs
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2008-04-04 20:08:52 +00:00
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* copyright (c) 2008 Vitor Sessak
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2008-04-04 20:02:10 +00:00
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* copyright (c) 2007 Bobby Bingham
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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2008-04-04 20:08:52 +00:00
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#include <ctype.h>
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#include <string.h>
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2008-04-04 20:02:10 +00:00
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#include "avfilter.h"
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#include "avfiltergraph.h"
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2008-04-04 20:06:45 +00:00
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/**
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2008-04-04 20:08:49 +00:00
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* For use in av_log
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2008-04-04 20:06:45 +00:00
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*/
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2008-04-04 20:08:49 +00:00
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static const char *log_name(void *p)
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2008-04-04 20:06:25 +00:00
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{
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2008-04-04 20:08:49 +00:00
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return "Filter parser";
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2008-04-04 20:06:25 +00:00
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}
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2008-04-04 20:08:49 +00:00
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static const AVClass filter_parser_class = {
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"Filter parser",
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log_name
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2008-04-04 20:06:25 +00:00
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};
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2008-04-04 20:08:49 +00:00
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static const AVClass *log_ctx = &filter_parser_class;
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2008-04-04 20:02:10 +00:00
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2008-04-04 20:09:14 +00:00
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void avfilter_destroy_graph(AVFilterGraph *graph)
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2008-04-04 20:08:49 +00:00
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{
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2008-04-04 20:05:01 +00:00
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for(; graph->filter_count > 0; graph->filter_count --)
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avfilter_destroy(graph->filters[graph->filter_count - 1]);
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2008-04-04 20:03:33 +00:00
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av_freep(&graph->filters);
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}
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2008-04-04 20:06:37 +00:00
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/* TODO: insert in sorted order */
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2008-04-04 20:08:56 +00:00
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void avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
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2008-04-04 20:03:33 +00:00
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{
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2008-04-04 20:02:10 +00:00
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graph->filters = av_realloc(graph->filters,
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sizeof(AVFilterContext*) * ++graph->filter_count);
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graph->filters[graph->filter_count - 1] = filter;
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}
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2008-04-04 20:06:37 +00:00
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/* search intelligently, once we insert in order */
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2008-04-04 20:08:56 +00:00
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AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
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2008-04-04 20:06:37 +00:00
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{
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int i;
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if(!name)
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return NULL;
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for(i = 0; i < graph->filter_count; i ++)
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if(graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
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return graph->filters[i];
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return NULL;
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}
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2008-04-04 20:08:56 +00:00
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static int query_formats(AVFilterGraph *graph)
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2008-04-04 20:07:41 +00:00
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{
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int i, j;
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/* ask all the sub-filters for their supported colorspaces */
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for(i = 0; i < graph->filter_count; i ++) {
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if(graph->filters[i]->filter->query_formats)
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graph->filters[i]->filter->query_formats(graph->filters[i]);
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else
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avfilter_default_query_formats(graph->filters[i]);
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}
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/* go through and merge as many format lists as possible */
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for(i = 0; i < graph->filter_count; i ++) {
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AVFilterContext *filter = graph->filters[i];
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for(j = 0; j < filter->input_count; j ++) {
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AVFilterLink *link;
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if(!(link = filter->inputs[j]))
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continue;
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if(link->in_formats != link->out_formats) {
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if(!avfilter_merge_formats(link->in_formats,
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link->out_formats)) {
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/* couldn't merge format lists. auto-insert scale filter */
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AVFilterContext *scale;
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2008-04-04 20:08:31 +00:00
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if(!(scale =
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avfilter_open(avfilter_get_by_name("scale"), NULL)))
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2008-04-04 20:07:41 +00:00
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return -1;
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if(scale->filter->init(scale, NULL, NULL) ||
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avfilter_insert_filter(link, scale, 0, 0)) {
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avfilter_destroy(scale);
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return -1;
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}
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2008-04-04 20:08:49 +00:00
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avfilter_graph_add_filter(graph, scale);
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2008-04-04 20:07:41 +00:00
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scale->filter->query_formats(scale);
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2008-04-04 20:07:44 +00:00
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if(!avfilter_merge_formats(scale-> inputs[0]->in_formats,
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2008-04-04 20:07:41 +00:00
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scale-> inputs[0]->out_formats) ||
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2008-04-04 20:07:44 +00:00
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!avfilter_merge_formats(scale->outputs[0]->in_formats,
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2008-04-04 20:07:41 +00:00
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scale->outputs[0]->out_formats))
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return -1;
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}
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}
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}
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}
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return 0;
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}
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static void pick_format(AVFilterLink *link)
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{
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if(!link || !link->in_formats)
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return;
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link->in_formats->format_count = 1;
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link->format = link->in_formats->formats[0];
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avfilter_formats_unref(&link->in_formats);
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avfilter_formats_unref(&link->out_formats);
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}
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2008-04-04 20:08:56 +00:00
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static void pick_formats(AVFilterGraph *graph)
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2008-04-04 20:07:41 +00:00
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{
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int i, j;
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for(i = 0; i < graph->filter_count; i ++) {
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AVFilterContext *filter = graph->filters[i];
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for(j = 0; j < filter->input_count; j ++)
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pick_format(filter->inputs[j]);
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for(j = 0; j < filter->output_count; j ++)
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pick_format(filter->outputs[j]);
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}
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}
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2008-04-04 20:08:56 +00:00
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int avfilter_graph_config_formats(AVFilterGraph *graph)
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2008-04-04 20:07:41 +00:00
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{
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2008-04-04 20:08:05 +00:00
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/* find supported formats from sub-filters, and merge along links */
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2008-04-04 20:08:49 +00:00
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if(query_formats(graph))
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2008-04-04 20:07:41 +00:00
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return -1;
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/* Once everything is merged, it's possible that we'll still have
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2008-04-04 20:08:26 +00:00
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* multiple valid colorspace choices. We pick the first one. */
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2008-04-04 20:07:41 +00:00
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pick_formats(graph);
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return 0;
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}
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2008-04-04 20:08:59 +00:00
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static int create_filter(AVFilterGraph *ctx, int index, char *name,
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char *args)
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2008-04-04 20:06:37 +00:00
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{
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2008-04-04 20:08:59 +00:00
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AVFilterContext *filt;
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2008-04-04 20:06:37 +00:00
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2008-04-04 20:06:47 +00:00
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AVFilter *filterdef;
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2008-04-04 20:08:34 +00:00
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char tmp[20];
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2008-04-04 20:06:47 +00:00
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2008-04-04 20:08:59 +00:00
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snprintf(tmp, 20, "%d", index);
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if(!(filterdef = avfilter_get_by_name(name)) ||
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!(filt = avfilter_open(filterdef, tmp))) {
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av_log(&log_ctx, AV_LOG_ERROR,
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"error creating filter '%s'\n", name);
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return -1;
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2008-04-04 20:06:37 +00:00
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}
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2008-04-04 20:08:59 +00:00
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avfilter_graph_add_filter(ctx, filt);
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if(avfilter_init_filter(filt, args, NULL)) {
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av_log(&log_ctx, AV_LOG_ERROR,
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"error initializing filter '%s'\n", name);
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return -1;
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2008-04-04 20:06:37 +00:00
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}
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2008-04-04 20:08:40 +00:00
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return 0;
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2008-04-04 20:08:59 +00:00
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}
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static int link_filter(AVFilterGraph *ctx, int src, int srcpad,
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int dst, int dstpad)
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{
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AVFilterContext *filt, *filtb;
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char tmp[20];
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snprintf(tmp, 20, "%d", src);
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if(!(filt = avfilter_graph_get_filter(ctx, tmp))) {
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av_log(&log_ctx, AV_LOG_ERROR, "link source does not exist in graph\n");
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return -1;
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}
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snprintf(tmp, 20, "%d", dst);
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if(!(filtb = avfilter_graph_get_filter(ctx, tmp))) {
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av_log(&log_ctx, AV_LOG_ERROR, "link destination does not exist in graph\n");
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return -1;
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}
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if(avfilter_link(filt, srcpad, filtb, dstpad)) {
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av_log(&log_ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
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return -1;
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}
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2008-04-04 20:08:40 +00:00
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|
2008-04-04 20:08:59 +00:00
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return 0;
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2008-04-04 20:08:40 +00:00
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}
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|
2008-04-04 20:08:52 +00:00
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static void consume_whitespace(const char **buf)
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{
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*buf += strspn(*buf, " \n\t");
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|
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}
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/**
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* get the next non-whitespace char
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|
|
|
*/
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static char consume_char(const char **buf)
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|
|
{
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|
|
char out;
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consume_whitespace(buf);
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|
|
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out = **buf;
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if (out)
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(*buf)++;
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return out;
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|
}
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|
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/**
|
2008-04-04 20:09:20 +00:00
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* Copy the first size bytes of input string to a null-terminated string,
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|
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* removing any control character. Ex: "aaa'bb'c\'c\\" -> "aaabbc'c\"
|
2008-04-04 20:08:52 +00:00
|
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|
*/
|
2008-04-04 20:09:20 +00:00
|
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|
static void copy_unquoted(char *out, const char *in, int size)
|
2008-04-04 20:08:52 +00:00
|
|
|
{
|
2008-04-04 20:09:20 +00:00
|
|
|
int i;
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|
|
for (i=0; i < size; i++) {
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|
|
if (in[i] == '\'')
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|
continue;
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|
|
else if (in[i] == '\\') {
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|
|
|
if (i+1 == size) {
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|
|
*out = 0;
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|
|
return;
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|
|
|
}
|
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|
i++;
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|
|
}
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|
|
*out++ = in[i];
|
2008-04-04 20:08:52 +00:00
|
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|
}
|
2008-04-04 20:09:20 +00:00
|
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|
*out=0;
|
2008-04-04 20:08:52 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
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|
|
* Consumes a string from *buf.
|
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|
|
* @return a copy of the consumed string, which should be free'd after use
|
|
|
|
*/
|
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|
|
static char *consume_string(const char **buf)
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|
|
|
{
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|
|
|
const char *start;
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|
|
|
char *ret;
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|
|
|
int size;
|
|
|
|
|
|
|
|
consume_whitespace(buf);
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|
|
|
|
|
|
if (!(**buf))
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|
|
|
return av_mallocz(1);
|
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|
|
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|
start = *buf;
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|
|
|
|
2008-04-04 20:09:20 +00:00
|
|
|
while(1) {
|
|
|
|
*buf += strcspn(*buf, " ()=,'\\");
|
|
|
|
if (**buf == '\\')
|
|
|
|
*buf+=2;
|
|
|
|
else
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|
|
break;
|
|
|
|
}
|
2008-04-04 20:08:52 +00:00
|
|
|
|
|
|
|
if (**buf == '\'') {
|
2008-04-04 20:09:20 +00:00
|
|
|
const char *p = *buf;
|
|
|
|
do {
|
|
|
|
p++;
|
|
|
|
p = strchr(p, '\'');
|
|
|
|
} while (p && p[-1] == '\\');
|
2008-04-04 20:08:52 +00:00
|
|
|
if (p)
|
|
|
|
*buf = p + 1;
|
|
|
|
else
|
|
|
|
*buf += strlen(*buf); // Move the pointer to the null end byte
|
|
|
|
}
|
|
|
|
|
|
|
|
size = *buf - start + 1;
|
|
|
|
ret = av_malloc(size);
|
2008-04-04 20:09:20 +00:00
|
|
|
copy_unquoted(ret, start, size-1);
|
2008-04-04 20:08:52 +00:00
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Parse "(linkname)"
|
|
|
|
* @arg name a pointer (that need to be free'd after use) to the name between
|
|
|
|
* parenthesis
|
|
|
|
*/
|
|
|
|
static void parse_link_name(const char **buf, char **name)
|
|
|
|
{
|
|
|
|
consume_char(buf);
|
|
|
|
|
|
|
|
*name = consume_string(buf);
|
|
|
|
|
|
|
|
if (!*name[0])
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
if (consume_char(buf) != ')')
|
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|
|
goto fail;
|
|
|
|
|
|
|
|
return;
|
|
|
|
fail:
|
|
|
|
av_freep(name);
|
|
|
|
av_log(&log_ctx, AV_LOG_ERROR, "Could not parse link name!\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Parse "filter=params"
|
|
|
|
* @arg name a pointer (that need to be free'd after use) to the name of the
|
|
|
|
* filter
|
|
|
|
* @arg ars a pointer (that need to be free'd after use) to the args of the
|
|
|
|
* filter
|
|
|
|
*/
|
2008-04-04 20:09:17 +00:00
|
|
|
static int parse_filter(const char **buf, AVFilterGraph *graph, int index)
|
2008-04-04 20:08:52 +00:00
|
|
|
{
|
2008-04-04 20:09:17 +00:00
|
|
|
char *name, *opts;
|
|
|
|
name = consume_string(buf);
|
2008-04-04 20:08:52 +00:00
|
|
|
|
|
|
|
if (**buf == '=') {
|
|
|
|
consume_char(buf);
|
2008-04-04 20:09:17 +00:00
|
|
|
opts = consume_string(buf);
|
2008-04-04 20:08:52 +00:00
|
|
|
} else {
|
2008-04-04 20:09:17 +00:00
|
|
|
opts = NULL;
|
2008-04-04 20:08:52 +00:00
|
|
|
}
|
|
|
|
|
2008-04-04 20:09:17 +00:00
|
|
|
return create_filter(graph, index, name, opts);
|
2008-04-04 20:08:52 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
enum LinkType {
|
|
|
|
LinkTypeIn,
|
|
|
|
LinkTypeOut,
|
|
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
|
|
* A linked-list of the inputs/outputs of the filter chain.
|
|
|
|
*/
|
|
|
|
typedef struct AVFilterInOut {
|
|
|
|
enum LinkType type;
|
|
|
|
char *name;
|
|
|
|
int instance;
|
|
|
|
int pad_idx;
|
|
|
|
|
|
|
|
struct AVFilterInOut *next;
|
|
|
|
} AVFilterInOut;
|
|
|
|
|
|
|
|
static void free_inout(AVFilterInOut *head)
|
|
|
|
{
|
|
|
|
while (head) {
|
|
|
|
AVFilterInOut *next;
|
|
|
|
next = head->next;
|
|
|
|
av_free(head);
|
|
|
|
head = next;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Parse "(a1)(link2) ... (etc)"
|
|
|
|
*/
|
|
|
|
static int parse_inouts(const char **buf, AVFilterInOut **inout, int firstpad,
|
|
|
|
enum LinkType type, int instance)
|
|
|
|
{
|
|
|
|
int pad = firstpad;
|
|
|
|
while (**buf == '(') {
|
|
|
|
AVFilterInOut *inoutn = av_malloc(sizeof(AVFilterInOut));
|
|
|
|
parse_link_name(buf, &inoutn->name);
|
|
|
|
inoutn->type = type;
|
|
|
|
inoutn->instance = instance;
|
|
|
|
inoutn->pad_idx = pad++;
|
|
|
|
inoutn->next = *inout;
|
|
|
|
*inout = inoutn;
|
|
|
|
}
|
|
|
|
return pad;
|
|
|
|
}
|
|
|
|
|
2008-04-04 20:09:08 +00:00
|
|
|
/**
|
2008-04-04 20:09:17 +00:00
|
|
|
* Parse a string describing a filter graph.
|
2008-04-04 20:09:08 +00:00
|
|
|
*/
|
2008-04-04 20:09:17 +00:00
|
|
|
int avfilter_graph_parse_chain(AVFilterGraph *graph, const char *filters, AVFilterContext *in, int inpad, AVFilterContext *out, int outpad)
|
2008-04-04 20:08:52 +00:00
|
|
|
{
|
|
|
|
AVFilterInOut *inout=NULL;
|
2008-04-04 20:09:17 +00:00
|
|
|
AVFilterInOut *head=NULL;
|
2008-04-04 20:08:52 +00:00
|
|
|
|
|
|
|
int index = 0;
|
|
|
|
char chr = 0;
|
|
|
|
int pad = 0;
|
|
|
|
int has_out = 0;
|
|
|
|
|
2008-04-04 20:09:17 +00:00
|
|
|
char tmp[20];
|
|
|
|
AVFilterContext *filt;
|
|
|
|
|
2008-04-04 20:08:52 +00:00
|
|
|
consume_whitespace(&filters);
|
|
|
|
|
2008-04-04 20:09:17 +00:00
|
|
|
do {
|
|
|
|
int oldpad = pad;
|
2008-04-04 20:08:52 +00:00
|
|
|
|
2008-04-04 20:09:17 +00:00
|
|
|
pad = parse_inouts(&filters, &inout, chr == ',', LinkTypeIn, index);
|
2008-04-04 20:08:52 +00:00
|
|
|
|
2008-04-04 20:09:17 +00:00
|
|
|
if (parse_filter(&filters, graph, index) < 0)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
// If the first filter has an input and none was given, it is
|
|
|
|
// implicitly the input of the whole graph.
|
|
|
|
if (pad == 0 && graph->filters[graph->filter_count-1]->input_count == 1) {
|
|
|
|
snprintf(tmp, 20, "%d", index);
|
|
|
|
if(!(filt = avfilter_graph_get_filter(graph, tmp))) {
|
|
|
|
av_log(&log_ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
if(avfilter_link(in, inpad, filt, 0)) {
|
|
|
|
av_log(&log_ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
|
|
|
|
goto fail;
|
|
|
|
}
|
2008-04-04 20:08:52 +00:00
|
|
|
}
|
|
|
|
|
2008-04-04 20:09:17 +00:00
|
|
|
if(chr == ',') {
|
|
|
|
if (link_filter(graph, index-1, oldpad, index, 0) < 0)
|
|
|
|
goto fail;
|
2008-04-04 20:08:52 +00:00
|
|
|
|
2008-04-04 20:09:17 +00:00
|
|
|
}
|
|
|
|
pad = parse_inouts(&filters, &inout, 0, LinkTypeOut, index);
|
2008-04-04 20:08:52 +00:00
|
|
|
chr = consume_char(&filters);
|
|
|
|
index++;
|
|
|
|
} while (chr == ',' || chr == ';');
|
|
|
|
|
|
|
|
head = inout;
|
|
|
|
for (; inout != NULL; inout = inout->next) {
|
|
|
|
if (inout->instance == -1)
|
|
|
|
continue; // Already processed
|
|
|
|
|
|
|
|
if (!strcmp(inout->name, "in")) {
|
2008-04-04 20:09:17 +00:00
|
|
|
snprintf(tmp, 20, "%d", inout->instance);
|
|
|
|
if(!(filt = avfilter_graph_get_filter(graph, tmp))) {
|
|
|
|
av_log(&log_ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
if(avfilter_link(in, inpad, filt, inout->pad_idx)) {
|
|
|
|
av_log(&log_ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
|
2008-04-04 20:08:52 +00:00
|
|
|
goto fail;
|
2008-04-04 20:09:17 +00:00
|
|
|
}
|
2008-04-04 20:08:52 +00:00
|
|
|
} else if (!strcmp(inout->name, "out")) {
|
|
|
|
has_out = 1;
|
2008-04-04 20:09:17 +00:00
|
|
|
snprintf(tmp, 20, "%d", inout->instance);
|
|
|
|
if(!(filt = avfilter_graph_get_filter(graph, tmp))) {
|
|
|
|
av_log(&log_ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
if(avfilter_link(filt, inout->pad_idx, out, outpad)) {
|
|
|
|
av_log(&log_ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
2008-04-04 20:08:52 +00:00
|
|
|
} else {
|
|
|
|
AVFilterInOut *p, *src, *dst;
|
|
|
|
for (p = inout->next;
|
|
|
|
p && strcmp(p->name,inout->name); p = p->next);
|
|
|
|
|
|
|
|
if (!p) {
|
|
|
|
av_log(&log_ctx, AV_LOG_ERROR, "Unmatched link: %s.\n",
|
|
|
|
inout->name);
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (p->type == LinkTypeIn && inout->type == LinkTypeOut) {
|
|
|
|
src = inout;
|
|
|
|
dst = p;
|
|
|
|
} else if (p->type == LinkTypeOut && inout->type == LinkTypeIn) {
|
|
|
|
src = p;
|
|
|
|
dst = inout;
|
|
|
|
} else {
|
|
|
|
av_log(&log_ctx, AV_LOG_ERROR, "Two links named '%s' are either both input or both output\n",
|
|
|
|
inout->name);
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
2008-04-04 20:09:17 +00:00
|
|
|
if (link_filter(graph, src->instance, src->pad_idx, dst->instance, dst->pad_idx) < 0)
|
|
|
|
goto fail;
|
2008-04-04 20:08:52 +00:00
|
|
|
|
|
|
|
src->instance = -1;
|
|
|
|
dst->instance = -1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
free_inout(head);
|
|
|
|
|
|
|
|
if (!has_out) {
|
2008-04-04 20:09:17 +00:00
|
|
|
snprintf(tmp, 20, "%d", index-1);
|
|
|
|
if(!(filt = avfilter_graph_get_filter(graph, tmp))) {
|
|
|
|
av_log(&log_ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
|
|
|
|
goto fail;
|
|
|
|
}
|
2008-04-04 20:08:52 +00:00
|
|
|
|
2008-04-04 20:09:17 +00:00
|
|
|
if(avfilter_link(filt, pad, out, outpad)) {
|
|
|
|
av_log(&log_ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
|
|
|
|
goto fail;
|
|
|
|
}
|
2008-04-04 20:09:02 +00:00
|
|
|
|
|
|
|
}
|
2008-04-04 20:08:52 +00:00
|
|
|
|
2008-04-04 20:09:02 +00:00
|
|
|
return 0;
|
2008-04-04 20:09:17 +00:00
|
|
|
|
|
|
|
fail:
|
|
|
|
free_inout(head);
|
|
|
|
avfilter_destroy_graph(graph);
|
|
|
|
return -1;
|
2008-04-04 20:08:52 +00:00
|
|
|
}
|