2 * Copyright (c) 2009 Stefano Sabatini
4 * This file is part of Libav.
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "libavformat/avformat.h"
24 #include "libavutil/pixdesc.h"
25 #include "libavfilter/avfilter.h"
26 #include "libavfilter/formats.h"
28 int main(int argc, char **argv)
31 AVFilterContext *filter_ctx;
32 AVFilterGraph *graph_ctx;
33 const char *filter_name;
34 const char *filter_args = NULL;
37 av_log_set_level(AV_LOG_DEBUG);
40 fprintf(stderr, "Missing filter name as argument\n");
44 filter_name = argv[1];
46 filter_args = argv[2];
49 graph_ctx = avfilter_graph_alloc();
53 avfilter_register_all();
55 /* get a corresponding filter and open it */
56 if (!(filter = avfilter_get_by_name(filter_name))) {
57 fprintf(stderr, "Unrecognized filter with name '%s'\n", filter_name);
61 /* open filter and add it to the graph */
62 if (!(filter_ctx = avfilter_graph_alloc_filter(graph_ctx, filter, filter_name))) {
63 fprintf(stderr, "Impossible to open filter with name '%s'\n",
67 if (avfilter_init_str(filter_ctx, filter_args) < 0) {
68 fprintf(stderr, "Impossible to init filter '%s' with arguments '%s'\n",
69 filter_name, filter_args);
73 /* create a link for each of the input pads */
74 for (i = 0; i < filter_ctx->input_count; i++) {
75 AVFilterLink *link = av_mallocz(sizeof(AVFilterLink));
76 link->type = filter_ctx->filter->inputs[i].type;
77 filter_ctx->inputs[i] = link;
79 for (i = 0; i < filter_ctx->output_count; i++) {
80 AVFilterLink *link = av_mallocz(sizeof(AVFilterLink));
81 link->type = filter_ctx->filter->outputs[i].type;
82 filter_ctx->outputs[i] = link;
85 if (filter->query_formats)
86 filter->query_formats(filter_ctx);
88 ff_default_query_formats(filter_ctx);
90 /* print the supported formats in input */
91 for (i = 0; i < filter_ctx->input_count; i++) {
92 AVFilterFormats *fmts = filter_ctx->inputs[i]->out_formats;
93 for (j = 0; j < fmts->nb_formats; j++)
94 printf("INPUT[%d] %s: %s\n",
95 i, filter_ctx->filter->inputs[i].name,
96 av_get_pix_fmt_name(fmts->formats[j]));
99 /* print the supported formats in output */
100 for (i = 0; i < filter_ctx->output_count; i++) {
101 AVFilterFormats *fmts = filter_ctx->outputs[i]->in_formats;
102 for (j = 0; j < fmts->nb_formats; j++)
103 printf("OUTPUT[%d] %s: %s\n",
104 i, filter_ctx->filter->outputs[i].name,
105 av_get_pix_fmt_name(fmts->formats[j]));
108 avfilter_free(filter_ctx);
109 avfilter_graph_free(&graph_ctx);