/* * filter graphs * Copyright (c) 2008 Vitor Sessak * Copyright (c) 2007 Bobby Bingham * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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" #include "internal.h" AVFilterGraph *avfilter_graph_alloc(void) { return av_mallocz(sizeof(AVFilterGraph)); } void avfilter_graph_free(AVFilterGraph **graph) { if (!*graph) return; for (; (*graph)->filter_count > 0; (*graph)->filter_count--) avfilter_free((*graph)->filters[(*graph)->filter_count - 1]); av_freep(&(*graph)->scale_sws_opts); av_freep(&(*graph)->filters); av_freep(graph); } 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_create_filter(AVFilterContext **filt_ctx, AVFilter *filt, const char *name, const char *args, void *opaque, AVFilterGraph *graph_ctx) { int ret; if ((ret = avfilter_open(filt_ctx, filt, name)) < 0) goto fail; if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0) goto fail; if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0) goto fail; return 0; fail: if (*filt_ctx) avfilter_free(*filt_ctx); *filt_ctx = NULL; return ret; } int ff_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 AVERROR(EINVAL); } } 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 AVERROR(EINVAL); } } } return 0; } int ff_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, ret; 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++); snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts); if ((ret = avfilter_graph_create_filter(&scale, avfilter_get_by_name("scale"), inst_name, scale_args, NULL, graph)) < 0) return ret; if ((ret = avfilter_insert_filter(link, scale, 0, 0)) < 0) return ret; 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 AVERROR(EINVAL); } } } } } 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 ff_avfilter_graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx) { int ret; /* find supported formats from sub-filters, and merge along links */ if ((ret = query_formats(graph, log_ctx)) < 0) return ret; /* 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, void *log_ctx) { int ret; if ((ret = ff_avfilter_graph_check_validity(graphctx, log_ctx))) return ret; if ((ret = ff_avfilter_graph_config_formats(graphctx, log_ctx))) return ret; if ((ret = ff_avfilter_graph_config_links(graphctx, log_ctx))) return ret; return 0; }