/* * filter graphs * copyright (c) 2008 Vitor Sessak * copyright (c) 2007 Bobby Bingham * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */#include <ctype.h>#include <string.h>#include "avfilter.h"#include "avfiltergraph.h"void avfilter_destroy_graph(AVFilterGraph *graph){    for(; graph->filter_count > 0; graph->filter_count --)        avfilter_destroy(graph->filters[graph->filter_count - 1]);    av_freep(&graph->filters);}int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter){    graph->filters = av_realloc(graph->filters,                                sizeof(AVFilterContext*) * ++graph->filter_count);    if (!graph->filters)        return -1;    graph->filters[graph->filter_count - 1] = filter;    return 0;}AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name){    int i;    for(i = 0; i < graph->filter_count; i ++)        if(graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))            return graph->filters[i];    return NULL;}static int query_formats(AVFilterGraph *graph){    int i, j;    int scaler_count = 0;    char inst_name[30];    /* ask all the sub-filters for their supported colorspaces */    for(i = 0; i < graph->filter_count; i ++) {        if(graph->filters[i]->filter->query_formats)            graph->filters[i]->filter->query_formats(graph->filters[i]);        else            avfilter_default_query_formats(graph->filters[i]);    }    /* go through and merge as many format lists as possible */    for(i = 0; i < graph->filter_count; i ++) {        AVFilterContext *filter = graph->filters[i];        for(j = 0; j < filter->input_count; j ++) {            AVFilterLink *link = filter->inputs[j];            if(link && link->in_formats != link->out_formats) {                if(!avfilter_merge_formats(link->in_formats,                                           link->out_formats)) {                    AVFilterContext *scale;                    /* couldn't merge format lists. auto-insert scale filter */                    snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",                             scaler_count);                    scale =                        avfilter_open(avfilter_get_by_name("scale"),inst_name);                    if(!scale || scale->filter->init(scale, NULL, NULL) ||                                 avfilter_insert_filter(link, scale, 0, 0)) {                        avfilter_destroy(scale);                        return -1;                    }                    if (avfilter_graph_add_filter(graph, scale) < 0)                        return -1;                    scale->filter->query_formats(scale);                    if(!avfilter_merge_formats(scale-> inputs[0]->in_formats,                                               scale-> inputs[0]->out_formats)||                       !avfilter_merge_formats(scale->outputs[0]->in_formats,                                               scale->outputs[0]->out_formats))                        return -1;                }            }        }    }    return 0;}static void pick_format(AVFilterLink *link){    if(!link || !link->in_formats)        return;    link->in_formats->format_count = 1;    link->format = link->in_formats->formats[0];    avfilter_formats_unref(&link->in_formats);    avfilter_formats_unref(&link->out_formats);}static void pick_formats(AVFilterGraph *graph){    int i, j;    for(i = 0; i < graph->filter_count; i ++) {        AVFilterContext *filter = graph->filters[i];        for(j = 0; j < filter->input_count; j ++)            pick_format(filter->inputs[j]);        for(j = 0; j < filter->output_count; j ++)            pick_format(filter->outputs[j]);    }}int avfilter_graph_config_formats(AVFilterGraph *graph){    /* find supported formats from sub-filters, and merge along links */    if(query_formats(graph))        return -1;    /* Once everything is merged, it's possible that we'll still have     * multiple valid colorspace choices. We pick the first one. */    pick_formats(graph);    return 0;}