elst.c

来自「这个库实现了录象功能」· C语言 代码 · 共 133 行

/*******************************************************************************
 elst.c

 libquicktime - A library for reading and writing quicktime/avi/mp4 files.
 http://libquicktime.sourceforge.net

 Copyright (C) 2002 Heroine Virtual Ltd.
 Copyright (C) 2002-2007 Members of the libquicktime project.

 This library is free software; you can redistribute it and/or modify it under
 the terms of the GNU Lesser General Public License as published by the Free
 Software Foundation; either version 2.1 of the License, or (at your option)
 any later version.

 This library is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 details.

 You should have received a copy of the GNU Lesser General Public License along
 with this library; if not, write to the Free Software Foundation, Inc., 51
 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*******************************************************************************/ 

#include "lqt_private.h"
#include <stdlib.h>

void quicktime_elst_table_init(quicktime_elst_table_t *table)
{
	table->duration = 0;
	table->time = 0;
	table->rate = 1;
}

void quicktime_elst_table_delete(quicktime_elst_table_t *table)
{
}

void 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);
}

void quicktime_write_elst_table(quicktime_t *file, quicktime_elst_table_t *table)
  {
  quicktime_write_int32(file, table->duration);
  quicktime_write_int32(file, table->time);
  quicktime_write_fixed32(file, table->rate);
  }

void quicktime_elst_table_dump(quicktime_elst_table_t *table)
{
	lqt_dump("    edit list table\n");
	lqt_dump("     duration %ld\n", table->duration);
	lqt_dump("     time %ld\n", table->time);
	lqt_dump("     rate %f\n", table->rate);
}

void quicktime_elst_init(quicktime_elst_t *elst)
{
	elst->version = 0;
	elst->flags = 0;
	elst->total_entries = 0;
	elst->table = 0;
}

void 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]));
	}
}

void 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;
}

void quicktime_elst_dump(quicktime_elst_t *elst)
{
	int i;
	lqt_dump("   edit list (elst)\n");
	lqt_dump("    version %d\n", elst->version);
	lqt_dump("    flags %ld\n", elst->flags);
	lqt_dump("    total_entries %ld\n", elst->total_entries);

	for(i = 0; i < elst->total_entries; i++)
	{
		quicktime_elst_table_dump(&(elst->table[i]));
	}
}

void quicktime_read_elst(quicktime_t *file, quicktime_elst_t *elst)
{
	int i;

	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*)calloc(1, 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]));
	}
}

void quicktime_write_elst(quicktime_t *file, quicktime_elst_t *elst)
  {
  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[i]);
  quicktime_atom_write_footer(file, &atom);
  }