流媒体/Mpeg4/MP4

开发平台：

Visual C++

elst.c：源码内容

							#include "quicktime.h"
int quicktime_elst_table_init(quicktime_elst_table_t *table)
{
	table->duration = 0;
	table->time = 0;
	table->rate = 1;
}
int quicktime_elst_table_delete(quicktime_elst_table_t *table)
{
}
int quicktime_read_elst_table(quicktime_t *file, quicktime_elst_table_t *table)
{
	table->duration = quicktime_read_int32(file);
	table->time = quicktime_read_int32(file);
	table->rate = quicktime_read_fixed32(file);
}
int quicktime_write_elst_table(quicktime_t *file, quicktime_elst_table_t *table, long duration)
{
	table->duration = duration;
	quicktime_write_int32(file, table->duration);
	quicktime_write_int32(file, table->time);
	quicktime_write_fixed32(file, table->rate);
}
int quicktime_elst_table_dump(quicktime_elst_table_t *table)
{
	printf("    edit list tablen");
	printf("     duration %ldn", table->duration);
	printf("     time %ldn", table->time);
	printf("     rate %fn", table->rate);
}
int quicktime_elst_init(quicktime_elst_t *elst)
{
	elst->version = 0;
	elst->flags = 0;
	elst->total_entries = 0;
	elst->table = 0;
}
int quicktime_elst_init_all(quicktime_elst_t *elst)
{
	if(!elst->total_entries)
	{
		elst->total_entries = 1;
		elst->table = (quicktime_elst_table_t*)malloc(sizeof(quicktime_elst_table_t) * elst->total_entries);
		quicktime_elst_table_init(&(elst->table[0]));
	}
}
int quicktime_elst_delete(quicktime_elst_t *elst)
{
	int i;
	if(elst->total_entries)
	{
		for(i = 0; i < elst->total_entries; i++)
			quicktime_elst_table_delete(&(elst->table[i]));
		free(elst->table);
	}
	elst->total_entries = 0;
}
int quicktime_elst_dump(quicktime_elst_t *elst)
{
	int i;
	printf("   edit list (elst)n");
	printf("    version %dn", elst->version);
	printf("    flags %dn", elst->flags);
	printf("    total_entries %dn", elst->total_entries);
	for(i = 0; i < elst->total_entries; i++)
	{
		quicktime_elst_table_dump(&(elst->table[i]));
	}
}
int quicktime_read_elst(quicktime_t *file, quicktime_elst_t *elst)
{
	int i;
	quicktime_atom_t leaf_atom;
	elst->version = quicktime_read_char(file);
	elst->flags = quicktime_read_int24(file);
	elst->total_entries = quicktime_read_int32(file);
	elst->table = (quicktime_elst_table_t*)malloc(sizeof(quicktime_elst_table_t) * elst->total_entries);
	for(i = 0; i < elst->total_entries; i++)
	{
		quicktime_elst_table_init(&(elst->table[i]));
		quicktime_read_elst_table(file, &(elst->table[i]));
	}
}
int quicktime_write_elst(quicktime_t *file, quicktime_elst_t *elst, long duration)
{
	quicktime_atom_t atom;
	int i;
	quicktime_atom_write_header(file, &atom, "elst");
	quicktime_write_char(file, elst->version);
	quicktime_write_int24(file, elst->flags);
	quicktime_write_int32(file, elst->total_entries);
	for(i = 0; i < elst->total_entries; i++)
	{
		quicktime_write_elst_table(file, elst->table, duration);
	}
	quicktime_atom_write_footer(file, &atom);
}

						