stco.c
上传用户:luping1608
上传日期:2007-01-06
资源大小:38k
文件大小:3k
- #include "quicktime.h"
- int quicktime_stco_init(quicktime_stco_t *stco)
- {
- stco->version = 0;
- stco->flags = 0;
- stco->total_entries = 0;
- stco->entries_allocated = 0;
- }
- int quicktime_stco_delete(quicktime_stco_t *stco)
- {
- if(stco->total_entries) free(stco->table);
- stco->total_entries = 0;
- stco->entries_allocated = 0;
- }
- int quicktime_stco_init_common(quicktime_t *file, quicktime_stco_t *stco)
- {
- if(!stco->entries_allocated)
- {
- stco->entries_allocated = 2000;
- stco->total_entries = 0;
- stco->table = (quicktime_stco_table_t*)malloc(sizeof(quicktime_stco_table_t) * stco->entries_allocated);
- //printf("quicktime_stco_init_common %xn", stco->table);
- }
- }
- int quicktime_stco_dump(quicktime_stco_t *stco)
- {
- int i;
- printf(" chunk offsetn");
- printf(" version %dn", stco->version);
- printf(" flags %dn", stco->flags);
- printf(" total_entries %dn", stco->total_entries);
- for(i = 0; i < stco->total_entries; i++)
- {
- printf(" offset %dn", stco->table[i].offset);
- }
- }
- int quicktime_read_stco(quicktime_t *file, quicktime_stco_t *stco)
- {
- int i;
- stco->version = quicktime_read_char(file);
- stco->flags = quicktime_read_int24(file);
- stco->total_entries = quicktime_read_int32(file);
- //printf("stco->total_entries %d %xn", stco->total_entries, stco);
- stco->entries_allocated = stco->total_entries;
- stco->table = (quicktime_stco_table_t*)malloc(sizeof(quicktime_stco_table_t) * stco->entries_allocated);
- for(i = 0; i < stco->total_entries; i++)
- {
- stco->table[i].offset = quicktime_read_int32(file);
- }
- }
- int quicktime_write_stco(quicktime_t *file, quicktime_stco_t *stco)
- {
- int i;
- quicktime_atom_t atom;
- quicktime_atom_write_header(file, &atom, "stco");
- quicktime_write_char(file, stco->version);
- quicktime_write_int24(file, stco->flags);
- quicktime_write_int32(file, stco->total_entries);
- for(i = 0; i < stco->total_entries; i++)
- {
- quicktime_write_int32(file, stco->table[i].offset);
- }
- quicktime_atom_write_footer(file, &atom);
- }
- int quicktime_update_stco(quicktime_stco_t *stco, long chunk, long offset)
- {
- quicktime_stco_table_t *new_table;
- long i;
- //printf("quicktime_update_stco %ldn", chunk);
- if(chunk > stco->entries_allocated)
- {
- stco->entries_allocated = chunk * 2;
- new_table = (quicktime_stco_table_t*)malloc(sizeof(quicktime_stco_table_t) * stco->entries_allocated);
- for(i = 0; i < stco->total_entries; i++) new_table[i].offset = stco->table[i].offset;
- //printf("quicktime_update_stco stco %x stco->table %x entries_allocated %ldn", stco, stco->table, stco->entries_allocated);
- free(stco->table);
- //printf("stco->table = new_tablen");
- stco->table = new_table;
- }
-
- stco->table[chunk - 1].offset = offset;
- if(chunk > stco->total_entries) stco->total_entries = chunk;
- }