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); }
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 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; 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++); scale = avfilter_open(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; }
int main(int argc, char **argv) { AVFilter *filter; AVFilterContext *filter_ctx; const char *filter_name; const char *filter_args = NULL; int i, j; av_log_set_level(AV_LOG_DEBUG); if (!argv[1]) { fprintf(stderr, "Missing filter name as argument\n"); return 1; } filter_name = argv[1]; if (argv[2]) filter_args = argv[2]; avfilter_register_all(); /* get a corresponding filter and open it */ if (!(filter = avfilter_get_by_name(filter_name))) { fprintf(stderr, "Unrecognized filter with name '%s'\n", filter_name); return 1; } if (avfilter_open(&filter_ctx, filter, NULL) < 0) { fprintf(stderr, "Inpossible to open filter with name '%s'\n", filter_name); return 1; } if (avfilter_init_filter(filter_ctx, filter_args, NULL) < 0) { fprintf(stderr, "Impossible to init filter '%s' with arguments '%s'\n", filter_name, filter_args); return 1; } /* create a link for each of the input pads */ for (i = 0; i < filter_ctx->input_count; i++) { AVFilterLink *link = av_mallocz(sizeof(AVFilterLink)); link->type = filter_ctx->filter->inputs[i].type; filter_ctx->inputs[i] = link; } for (i = 0; i < filter_ctx->output_count; i++) { AVFilterLink *link = av_mallocz(sizeof(AVFilterLink)); link->type = filter_ctx->filter->outputs[i].type; filter_ctx->outputs[i] = link; } if (filter->query_formats) filter->query_formats(filter_ctx); else avfilter_default_query_formats(filter_ctx); /* print the supported formats in input */ for (i = 0; i < filter_ctx->input_count; i++) { AVFilterFormats *fmts = filter_ctx->inputs[i]->out_formats; for (j = 0; j < fmts->format_count; j++) printf("INPUT[%d] %s: %s\n", i, filter_ctx->filter->inputs[i].name, av_pix_fmt_descriptors[fmts->formats[j]].name); } /* print the supported formats in output */ for (i = 0; i < filter_ctx->output_count; i++) { AVFilterFormats *fmts = filter_ctx->outputs[i]->in_formats; for (j = 0; j < fmts->format_count; j++) printf("OUTPUT[%d] %s: %s\n", i, filter_ctx->filter->outputs[i].name, av_pix_fmt_descriptors[fmts->formats[j]].name); } avfilter_destroy(filter_ctx); fflush(stdout); return 0; }