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/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.com
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
** Any non-GPL usage of this software or parts of this software is strictly
** forbidden.
**
** The "appropriate copyright message" mentioned in section 2c of the GPLv2
** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com"
**
** Commercial non-GPL licensing of this software is possible.
** For more info contact Nero AG through Mpeg4AAClicense@nero.com.
**
** $Id: mp4util.c,v 1.20 2007/11/01 12:33:29 menno Exp $
**/
#include "mp4ffint.h"
#include <stdlib.h>
int32_t mp4ff_read_data(mp4ff_t *f, int8_t *data, uint32_t size)
{
int32_t result = 1;
result = f->stream->read(f->stream->user_data, data, size);
f->current_position += size;
return result;
}
int32_t mp4ff_truncate(mp4ff_t * f)
{
return f->stream->truncate(f->stream->user_data);
}
int32_t mp4ff_write_data(mp4ff_t *f, int8_t *data, uint32_t size)
{
int32_t result = 1;
result = f->stream->write(f->stream->user_data, data, size);
f->current_position += size;
return result;
}
int32_t mp4ff_write_int32(mp4ff_t *f,const uint32_t data)
{
uint32_t result;
uint32_t a, b, c, d;
int8_t temp[4];
*(uint32_t*)temp = data;
a = (uint8_t)temp[0];
b = (uint8_t)temp[1];
c = (uint8_t)temp[2];
d = (uint8_t)temp[3];
result = (a<<24) | (b<<16) | (c<<8) | d;
return mp4ff_write_data(f,(uint8_t*)&result,sizeof(result));
}
int32_t mp4ff_set_position(mp4ff_t *f, const int64_t position)
{
f->stream->seek(f->stream->user_data, position);
f->current_position = position;
return 0;
}
int64_t mp4ff_position(const mp4ff_t *f)
{
return f->current_position;
}
uint64_t mp4ff_read_int64(mp4ff_t *f)
{
uint8_t data[8];
uint64_t result = 0;
int8_t i;
mp4ff_read_data(f, data, 8);
for (i = 0; i < 8; i++)
{
result |= ((uint64_t)data[i]) << ((7 - i) * 8);
}
return result;
}
uint32_t mp4ff_read_int32(mp4ff_t *f)
{
uint32_t result;
uint32_t a, b, c, d;
int8_t data[4];
mp4ff_read_data(f, data, 4);
a = (uint8_t)data[0];
b = (uint8_t)data[1];
c = (uint8_t)data[2];
d = (uint8_t)data[3];
result = (a<<24) | (b<<16) | (c<<8) | d;
return (uint32_t)result;
}
uint32_t mp4ff_read_int24(mp4ff_t *f)
{
uint32_t result;
uint32_t a, b, c;
int8_t data[4];
mp4ff_read_data(f, data, 3);
a = (uint8_t)data[0];
b = (uint8_t)data[1];
c = (uint8_t)data[2];
result = (a<<16) | (b<<8) | c;
return (uint32_t)result;
}
uint16_t mp4ff_read_int16(mp4ff_t *f)
{
uint32_t result;
uint32_t a, b;
int8_t data[2];
mp4ff_read_data(f, data, 2);
a = (uint8_t)data[0];
b = (uint8_t)data[1];
result = (a<<8) | b;
return (uint16_t)result;
}
char * mp4ff_read_string(mp4ff_t * f,uint32_t length)
{
char * str = (char*)malloc(length + 1);
if (str!=0)
{
if ((uint32_t)mp4ff_read_data(f,str,length)!=length)
{
free(str);
str = 0;
}
else
{
str[length] = 0;
}
}
return str;
}
uint8_t mp4ff_read_char(mp4ff_t *f)
{
uint8_t output;
mp4ff_read_data(f, &output, 1);
return output;
}
uint32_t mp4ff_read_mp4_descr_length(mp4ff_t *f)
{
uint8_t b;
uint8_t numBytes = 0;
uint32_t length = 0;
do
{
b = mp4ff_read_char(f);
numBytes++;
length = (length << 7) | (b & 0x7F);
} while ((b & 0x80) && numBytes < 4);
return length;
}
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