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stco.c
资源名称：NETVIDEO.rar　[点击查看]
上传用户：sun1608
上传日期：2007-02-02
资源大小：6116k
文件大小：2k
源码类别：

流媒体/Mpeg4/MP4

开发平台：

Visual C++

stco.c：源码内容
  1. #include "quicktime.h"
  5. int quicktime_stco_init(quicktime_stco_t *stco)
  6. {
  7. stco->version = 0;
  8. stco->flags = 0;
  9. stco->total_entries = 0;
  10. stco->entries_allocated = 0;
  11. }
  13. int quicktime_stco_delete(quicktime_stco_t *stco)
  14. {
  15. if(stco->total_entries) free(stco->table);
  16. stco->total_entries = 0;
  17. stco->entries_allocated = 0;
  18. }
  20. int quicktime_stco_init_common(quicktime_t *file, quicktime_stco_t *stco)
  21. {
  22. if(!stco->entries_allocated)
  23. {
  24. stco->entries_allocated = 2000;
  25. stco->total_entries = 0;
  26. stco->table = (quicktime_stco_table_t*)malloc(sizeof(quicktime_stco_table_t) * stco->entries_allocated);
  27. /*printf("quicktime_stco_init_common %xn", stco->table); */
  28. }
  29. }
  31. int quicktime_stco_dump(quicktime_stco_t *stco)
  32. {
  33. int i;
  34. printf("     chunk offsetn");
  35. printf("      version %dn", stco->version);
  36. printf("      flags %dn", stco->flags);
  37. printf("      total_entries %dn", stco->total_entries);
  38. for(i = 0; i < stco->total_entries; i++)
  39. {
  40. printf("       offset %d %xn", i, stco->table[i].offset);
  41. }
  42. }
  44. int quicktime_read_stco(quicktime_t *file, quicktime_stco_t *stco)
  45. {
  46. int i;
  47. stco->version = quicktime_read_char(file);
  48. stco->flags = quicktime_read_int24(file);
  49. stco->total_entries = quicktime_read_int32(file);
  50. /*printf("stco->total_entries %d %xn", stco->total_entries, stco); */
  51. stco->entries_allocated = stco->total_entries;
  52. stco->table = (quicktime_stco_table_t*)malloc(sizeof(quicktime_stco_table_t) * stco->entries_allocated);
  53. for(i = 0; i < stco->total_entries; i++)
  54. {
  55. stco->table[i].offset = quicktime_read_int32(file);
  56. }
  57. }
  59. int quicktime_write_stco(quicktime_t *file, quicktime_stco_t *stco)
  60. {
  61. int i;
  62. quicktime_atom_t atom;
  63. quicktime_atom_write_header(file, &atom, "stco");
  65. quicktime_write_char(file, stco->version);
  66. quicktime_write_int24(file, stco->flags);
  67. quicktime_write_int32(file, stco->total_entries);
  68. for(i = 0; i < stco->total_entries; i++)
  69. {
  70. quicktime_write_int32(file, stco->table[i].offset);
  71. }
  73. quicktime_atom_write_footer(file, &atom);
  74. }
  76. int quicktime_update_stco(quicktime_stco_t *stco, long chunk, long offset)
  77. {
  78. quicktime_stco_table_t *new_table;
  79. long i;
  81. if(chunk > stco->entries_allocated)
  82. {
  83. stco->entries_allocated = chunk * 2;
  84. stco->table = (quicktime_stco_table_t*)realloc(stco->table,
  85. sizeof(quicktime_stco_table_t) * stco->entries_allocated);
  86. }
  88. stco->table[chunk - 1].offset = offset;
  89. if(chunk > stco->total_entries) 
  90. stco->total_entries = chunk;
  91. }