116 lines
3.3 KiB
C++
116 lines
3.3 KiB
C++
/***************************************************************************
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copyright : (C) 2003 by Ismael Orenstein
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email : orenstein@kde.org
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***************************************************************************/
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/***************************************************************************
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* This library is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU Lesser General Public License version *
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* 2.1 as published by the Free Software Foundation. *
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* *
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* This library is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* Lesser General Public License for more details. *
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* *
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* You should have received a copy of the GNU Lesser General Public *
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* License along with this library; if not, write to the Free Software *
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA *
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* 02110-1301 USA *
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* *
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* Alternatively, this file is available under the Mozilla Public *
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* License Version 1.1. You may obtain a copy of the License at *
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* http://www.mozilla.org/MPL/ *
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***************************************************************************/
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#include <tbytevector.h>
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#include <tstring.h>
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#include <tdebug.h>
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#include "xingheader.h"
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using namespace TagLib;
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class MPEG::XingHeader::XingHeaderPrivate
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{
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public:
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XingHeaderPrivate() :
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frames(0),
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size(0),
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valid(false)
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{}
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uint frames;
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uint size;
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bool valid;
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};
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MPEG::XingHeader::XingHeader(const ByteVector &data)
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{
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d = new XingHeaderPrivate;
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parse(data);
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}
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MPEG::XingHeader::~XingHeader()
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{
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delete d;
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}
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bool MPEG::XingHeader::isValid() const
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{
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return d->valid;
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}
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TagLib::uint MPEG::XingHeader::totalFrames() const
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{
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return d->frames;
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}
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TagLib::uint MPEG::XingHeader::totalSize() const
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{
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return d->size;
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}
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int MPEG::XingHeader::xingHeaderOffset(TagLib::MPEG::Header::Version v,
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TagLib::MPEG::Header::ChannelMode c)
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{
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if(v == MPEG::Header::Version1) {
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if(c == MPEG::Header::SingleChannel)
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return 0x15;
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else
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return 0x24;
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}
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else {
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if(c == MPEG::Header::SingleChannel)
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return 0x0D;
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else
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return 0x15;
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}
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}
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void MPEG::XingHeader::parse(const ByteVector &data)
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{
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// Check to see if a valid Xing header is available.
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if(!data.startsWith("Xing") && !data.startsWith("Info"))
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return;
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// If the XingHeader doesn't contain the number of frames and the total stream
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// info it's invalid.
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if(!(data[7] & 0x01)) {
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debug("MPEG::XingHeader::parse() -- Xing header doesn't contain the total number of frames.");
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return;
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}
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if(!(data[7] & 0x02)) {
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debug("MPEG::XingHeader::parse() -- Xing header doesn't contain the total stream size.");
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return;
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}
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d->frames = data.toUInt(8U);
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d->size = data.toUInt(12U);
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d->valid = true;
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}
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