/* * 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"#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);} 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 -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 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 -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 ff_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 = 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;}