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/***************************************************************************
copyright : (C) 2003 by Ismael Orenstein
email : orenstein@kde.org
***************************************************************************/
/***************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License version *
* 2.1 as published by the Free Software Foundation. *
* *
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
* USA *
* *
* Alternatively, this file is available under the Mozilla Public *
* License Version 1.1. You may obtain a copy of the License at *
* http://www.mozilla.org/MPL/ *
***************************************************************************/
#include <tbytevector.h>
#include <tstring.h>
#include <tdebug.h>
#include "xingheader.h"
using namespace TagLib;
class MPEG::XingHeader::XingHeaderPrivate
{
public:
XingHeaderPrivate() :
frames(0),
size(0),
valid(false)
{}
uint frames;
uint size;
bool valid;
};
MPEG::XingHeader::XingHeader(const ByteVector &data)
{
d = new XingHeaderPrivate;
parse(data);
}
MPEG::XingHeader::~XingHeader()
{
delete d;
}
bool MPEG::XingHeader::isValid() const
{
return d->valid;
}
TagLib::uint MPEG::XingHeader::totalFrames() const
{
return d->frames;
}
TagLib::uint MPEG::XingHeader::totalSize() const
{
return d->size;
}
int MPEG::XingHeader::xingHeaderOffset(TagLib::MPEG::Header::Version v,
TagLib::MPEG::Header::ChannelMode c)
{
if(v == MPEG::Header::Version1) {
if(c == MPEG::Header::SingleChannel)
return 0x15;
else
return 0x24;
}
else {
if(c == MPEG::Header::SingleChannel)
return 0x0D;
else
return 0x15;
}
}
void MPEG::XingHeader::parse(const ByteVector &data)
{
// Check to see if a valid Xing header is available.
if(!data.startsWith("Xing") && !data.startsWith("Info"))
return;
// If the XingHeader doesn't contain the number of frames and the total stream
// info it's invalid.
if(!(data[7] & 0x01)) {
debug("MPEG::XingHeader::parse() -- Xing header doesn't contain the total number of frames.");
return;
}
if(!(data[7] & 0x02)) {
debug("MPEG::XingHeader::parse() -- Xing header doesn't contain the total stream size.");
return;
}
d->frames = data.mid(8, 4).toUInt();
d->size = data.mid(12, 4).toUInt();
d->valid = true;
}
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