stsz.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_stsz_init(quicktime_stsz_t *stsz)
- {
- stsz->version = 0;
- stsz->flags = 0;
- stsz->sample_size = 0;
- stsz->total_entries = 0;
- stsz->entries_allocated = 0;
- }
- int quicktime_stsz_init_video(quicktime_t *file, quicktime_stsz_t *stsz)
- {
- stsz->sample_size = 0;
- if(!stsz->entries_allocated)
- {
- stsz->entries_allocated = 2000;
- stsz->total_entries = 0;
- stsz->table = (quicktime_stsz_table_t*)malloc(sizeof(quicktime_stsz_table_t) * stsz->entries_allocated);
- }
- }
- int quicktime_stsz_init_audio(quicktime_t *file, quicktime_stsz_t *stsz, int channels, int bits)
- {
- //stsz->sample_size = channels * bits / 8;
- stsz->sample_size = 1; // ?
- stsz->total_entries = 0; // set this when closing
- stsz->entries_allocated = 0;
- }
- int quicktime_stsz_delete(quicktime_stsz_t *stsz)
- {
- if(!stsz->sample_size && stsz->total_entries) free(stsz->table);
- stsz->total_entries = 0;
- stsz->entries_allocated = 0;
- }
- int quicktime_stsz_dump(quicktime_stsz_t *stsz)
- {
- int i;
- printf(" sample sizen");
- printf(" version %dn", stsz->version);
- printf(" flags %dn", stsz->flags);
- printf(" sample_size %dn", stsz->sample_size);
- printf(" total_entries %dn", stsz->total_entries);
-
- if(!stsz->sample_size)
- {
- for(i = 0; i < stsz->total_entries; i++)
- {
- printf(" sample_size %dn", stsz->table[i].size);
- }
- }
- }
- int quicktime_read_stsz(quicktime_t *file, quicktime_stsz_t *stsz)
- {
- int i;
- stsz->version = quicktime_read_char(file);
- stsz->flags = quicktime_read_int24(file);
- stsz->sample_size = quicktime_read_int32(file);
- stsz->total_entries = quicktime_read_int32(file);
- stsz->entries_allocated = stsz->total_entries;
- if(!stsz->sample_size)
- {
- stsz->table = (quicktime_stsz_table_t*)malloc(sizeof(quicktime_stsz_table_t) * stsz->entries_allocated);
- for(i = 0; i < stsz->total_entries; i++)
- {
- stsz->table[i].size = quicktime_read_int32(file);
- }
- }
- }
- int quicktime_write_stsz(quicktime_t *file, quicktime_stsz_t *stsz)
- {
- int i, result;
- quicktime_atom_t atom;
- quicktime_atom_write_header(file, &atom, "stsz");
- // optimize if possible
- // doesn't work with xanim
- // if(!stsz->sample_size)
- // {
- // for(i = 0, result = 0; i < stsz->total_entries && !result; i++)
- // {
- // if(stsz->table[i].size != stsz->table[0].size) result = 1;
- // }
- //
- // if(!result)
- // {
- // stsz->sample_size = stsz->table[0].size;
- // stsz->total_entries = 0;
- // free(stsz->table);
- // }
- // }
- quicktime_write_char(file, stsz->version);
- quicktime_write_int24(file, stsz->flags);
- quicktime_write_int32(file, stsz->sample_size);
- if(stsz->sample_size)
- {
- quicktime_write_int32(file, stsz->total_entries);
- }
- else
- {
- quicktime_write_int32(file, stsz->total_entries);
- for(i = 0; i < stsz->total_entries; i++)
- {
- quicktime_write_int32(file, stsz->table[i].size);
- }
- }
- quicktime_atom_write_footer(file, &atom);
- }
- int quicktime_update_stsz(quicktime_stsz_t *stsz, long sample, long sample_size)
- {
- quicktime_stsz_table_t *new_table;
- int i;
- if(!stsz->sample_size)
- {
- if(sample >= stsz->entries_allocated)
- {
- stsz->entries_allocated = sample * 2;
- new_table = (quicktime_stsz_table_t*)malloc(sizeof(quicktime_stsz_table_t) * stsz->entries_allocated);
- for(i = 0; i < stsz->total_entries; i++) new_table[i] = stsz->table[i];
- free(stsz->table);
- stsz->table = new_table;
- }
-
- stsz->table[sample].size = sample_size;
- if(sample >= stsz->total_entries) stsz->total_entries = sample + 1;
- }
- }