/* * 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 #include #include "avfilter.h" #include "avfiltergraph.h" AVFilterGraph *avfilter_graph_alloc(void) { return av_mallocz(sizeof(AVFilterGraph)); } void avfilter_graph_destroy(AVFilterGraph *graph) { for(; graph->filter_count > 0; graph->filter_count --) avfilter_destroy(graph->filters[graph->filter_count - 1]); av_freep(&graph->scale_sws_opts); av_freep(&graph->filters); } int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter) { AVFilterContext **filters = av_realloc(graph->filters, sizeof(AVFilterContext*) * (graph->filter_count+1)); if (!filters) return AVERROR(ENOMEM); graph->filters = filters; graph->filters[graph->filter_count++] = filter; return 0; } int avfilter_graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx) { AVFilterContext *filt; int i, j; for (i=0; i < graph->filter_count; i++) { filt = graph->filters[i]; for (j = 0; j < filt->input_count; j++) { if (!filt->inputs[j] || !filt->inputs[j]->src) { av_log(log_ctx, AV_LOG_ERROR, "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n", filt->input_pads[j].name, filt->name, filt->filter->name); return -1; } } for (j = 0; j < filt->output_count; j++) { if (!filt->outputs[j] || !filt->outputs[j]->dst) { av_log(log_ctx, AV_LOG_ERROR, "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n", filt->output_pads[j].name, filt->name, filt->filter->name); return -1; } } } return 0; } int avfilter_graph_config_links(AVFilterGraph *graph, AVClass *log_ctx) { AVFilterContext *filt; int i, ret; for (i=0; i < graph->filter_count; i++) { filt = graph->filters[i]; if (!filt->output_count) { if ((ret = avfilter_config_links(filt))) return ret; } } 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, AVClass *log_ctx) { int i, j; int scaler_count = 0; char inst_name[30]; /* ask all the sub-filters for their supported media formats */ 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; char scale_args[256]; /* couldn't merge format lists. auto-insert scale filter */ snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d", scaler_count++); avfilter_open(&scale, avfilter_get_by_name("scale"), inst_name); snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts); if(!scale || scale->filter->init(scale, scale_args, 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 (((link = scale-> inputs[0]) && !avfilter_merge_formats(link->in_formats, link->out_formats)) || ((link = scale->outputs[0]) && !avfilter_merge_formats(link->in_formats, link->out_formats))) { av_log(log_ctx, AV_LOG_ERROR, "Impossible to convert between the formats supported by the filter " "'%s' and the filter '%s'\n", link->src->name, link->dst->name); 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, AVClass *log_ctx) { /* find supported formats from sub-filters, and merge along links */ if(query_formats(graph, log_ctx)) return -1; /* Once everything is merged, it's possible that we'll still have * multiple valid media format choices. We pick the first one. */ pick_formats(graph); return 0; } int avfilter_graph_config(AVFilterGraph *graphctx, AVClass *log_ctx) { int ret; if ((ret = avfilter_graph_check_validity(graphctx, log_ctx))) return ret; if ((ret = avfilter_graph_config_formats(graphctx, log_ctx))) return ret; if ((ret = avfilter_graph_config_links(graphctx, log_ctx))) return ret; return 0; }