lavfi-showfiltfmts.c
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1 /*
2  * Copyright (c) 2009 Stefano Sabatini
3  *
4  * This file is part of Libav.
5  *
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.
10  *
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.
15  *
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
19  */
20 
21 #include "libavformat/avformat.h"
22 #include "libavutil/pixdesc.h"
23 #include "libavfilter/avfilter.h"
24 
25 int main(int argc, char **argv)
26 {
28  AVFilterContext *filter_ctx;
29  const char *filter_name;
30  const char *filter_args = NULL;
31  int i, j;
32 
34 
35  if (!argv[1]) {
36  fprintf(stderr, "Missing filter name as argument\n");
37  return 1;
38  }
39 
40  filter_name = argv[1];
41  if (argv[2])
42  filter_args = argv[2];
43 
45 
46  /* get a corresponding filter and open it */
47  if (!(filter = avfilter_get_by_name(filter_name))) {
48  fprintf(stderr, "Unrecognized filter with name '%s'\n", filter_name);
49  return 1;
50  }
51 
52  if (avfilter_open(&filter_ctx, filter, NULL) < 0) {
53  fprintf(stderr, "Inpossible to open filter with name '%s'\n", filter_name);
54  return 1;
55  }
56  if (avfilter_init_filter(filter_ctx, filter_args, NULL) < 0) {
57  fprintf(stderr, "Impossible to init filter '%s' with arguments '%s'\n", filter_name, filter_args);
58  return 1;
59  }
60 
61  /* create a link for each of the input pads */
62  for (i = 0; i < filter_ctx->input_count; i++) {
63  AVFilterLink *link = av_mallocz(sizeof(AVFilterLink));
64  link->type = filter_ctx->filter->inputs[i].type;
65  filter_ctx->inputs[i] = link;
66  }
67  for (i = 0; i < filter_ctx->output_count; i++) {
68  AVFilterLink *link = av_mallocz(sizeof(AVFilterLink));
69  link->type = filter_ctx->filter->outputs[i].type;
70  filter_ctx->outputs[i] = link;
71  }
72 
73  if (filter->query_formats)
74  filter->query_formats(filter_ctx);
75  else
77 
78  /* print the supported formats in input */
79  for (i = 0; i < filter_ctx->input_count; i++) {
80  AVFilterFormats *fmts = filter_ctx->inputs[i]->out_formats;
81  for (j = 0; j < fmts->format_count; j++)
82  printf("INPUT[%d] %s: %s\n",
83  i, filter_ctx->filter->inputs[i].name,
85  }
86 
87  /* print the supported formats in output */
88  for (i = 0; i < filter_ctx->output_count; i++) {
89  AVFilterFormats *fmts = filter_ctx->outputs[i]->in_formats;
90  for (j = 0; j < fmts->format_count; j++)
91  printf("OUTPUT[%d] %s: %s\n",
92  i, filter_ctx->filter->outputs[i].name,
94  }
95 
96  avfilter_free(filter_ctx);
97  fflush(stdout);
98  return 0;
99 }