metadata.c 2.0 KB

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  1. /*
  2. * Copyright (c) 2011 Reinhard Tartler
  3. *
  4. * Permission is hereby granted, free of charge, to any person obtaining a copy
  5. * of this software and associated documentation files (the "Software"), to deal
  6. * in the Software without restriction, including without limitation the rights
  7. * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  8. * copies of the Software, and to permit persons to whom the Software is
  9. * furnished to do so, subject to the following conditions:
  10. *
  11. * The above copyright notice and this permission notice shall be included in
  12. * all copies or substantial portions of the Software.
  13. *
  14. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15. * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16. * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  17. * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18. * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19. * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  20. * THE SOFTWARE.
  21. */
  22. /**
  23. * @file
  24. * Shows how the metadata API can be used in application programs.
  25. * @example metadata.c
  26. */
  27. #include <stdio.h>
  28. #include <libavformat/avformat.h>
  29. #include <libavutil/dict.h>
  30. int main (int argc, char **argv)
  31. {
  32. AVFormatContext *fmt_ctx = NULL;
  33. const AVDictionaryEntry *tag = NULL;
  34. int ret;
  35. if (argc != 2) {
  36. printf("usage: %s <input_file>\n"
  37. "example program to demonstrate the use of the libavformat metadata API.\n"
  38. "\n", argv[0]);
  39. return 1;
  40. }
  41. if ((ret = avformat_open_input(&fmt_ctx, argv[1], NULL, NULL)))
  42. return ret;
  43. if ((ret = avformat_find_stream_info(fmt_ctx, NULL)) < 0) {
  44. av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n");
  45. return ret;
  46. }
  47. while ((tag = av_dict_get(fmt_ctx->metadata, "", tag, AV_DICT_IGNORE_SUFFIX)))
  48. printf("%s=%s\n", tag->key, tag->value);
  49. avformat_close_input(&fmt_ctx);
  50. return 0;
  51. }