221 lines
6.3 KiB
C++
221 lines
6.3 KiB
C++
/***************************************************************************
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copyright : (C) 2002 - 2008 by Scott Wheeler
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email : wheeler@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 <tdebug.h>
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#include <tstring.h>
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#include "mpegproperties.h"
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#include "mpegfile.h"
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#include "xingheader.h"
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#include "apetag.h"
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#include "apefooter.h"
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using namespace TagLib;
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class MPEG::Properties::PropertiesPrivate
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{
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public:
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PropertiesPrivate() :
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xingHeader(0),
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length(0),
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bitrate(0),
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sampleRate(0),
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channels(0),
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layer(0),
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version(Header::Version1),
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channelMode(Header::Stereo),
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protectionEnabled(false),
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isCopyrighted(false),
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isOriginal(false) {}
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~PropertiesPrivate()
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{
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delete xingHeader;
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}
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XingHeader *xingHeader;
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int length;
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int bitrate;
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int sampleRate;
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int channels;
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int layer;
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Header::Version version;
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Header::ChannelMode channelMode;
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bool protectionEnabled;
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bool isCopyrighted;
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bool isOriginal;
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};
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////////////////////////////////////////////////////////////////////////////////
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// public members
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////////////////////////////////////////////////////////////////////////////////
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MPEG::Properties::Properties(File *file, ReadStyle style) :
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AudioProperties(style),
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d(new PropertiesPrivate())
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{
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read(file);
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}
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MPEG::Properties::~Properties()
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{
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delete d;
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}
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int MPEG::Properties::length() const
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{
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return lengthInSeconds();
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}
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int MPEG::Properties::lengthInSeconds() const
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{
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return d->length / 1000;
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}
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int MPEG::Properties::lengthInMilliseconds() const
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{
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return d->length;
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}
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int MPEG::Properties::bitrate() const
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{
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return d->bitrate;
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}
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int MPEG::Properties::sampleRate() const
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{
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return d->sampleRate;
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}
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int MPEG::Properties::channels() const
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{
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return d->channels;
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}
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const MPEG::XingHeader *MPEG::Properties::xingHeader() const
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{
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return d->xingHeader;
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}
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MPEG::Header::Version MPEG::Properties::version() const
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{
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return d->version;
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}
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int MPEG::Properties::layer() const
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{
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return d->layer;
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}
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bool MPEG::Properties::protectionEnabled() const
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{
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return d->protectionEnabled;
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}
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MPEG::Header::ChannelMode MPEG::Properties::channelMode() const
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{
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return d->channelMode;
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}
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bool MPEG::Properties::isCopyrighted() const
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{
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return d->isCopyrighted;
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}
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bool MPEG::Properties::isOriginal() const
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{
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return d->isOriginal;
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}
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////////////////////////////////////////////////////////////////////////////////
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// private members
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////////////////////////////////////////////////////////////////////////////////
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void MPEG::Properties::read(File *file)
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{
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// Only the first valid frame is required if we have a VBR header.
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const long firstFrameOffset = file->firstFrameOffset();
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if(firstFrameOffset < 0) {
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debug("MPEG::Properties::read() -- Could not find an MPEG frame in the stream.");
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return;
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}
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const Header firstHeader(file, firstFrameOffset, false);
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// Check for a VBR header that will help us in gathering information about a
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// VBR stream.
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file->seek(firstFrameOffset);
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d->xingHeader = new XingHeader(file->readBlock(firstHeader.frameLength()));
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if(!d->xingHeader->isValid()) {
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delete d->xingHeader;
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d->xingHeader = 0;
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}
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if(d->xingHeader && firstHeader.samplesPerFrame() > 0 && firstHeader.sampleRate() > 0) {
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// Read the length and the bitrate from the VBR header.
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const double timePerFrame = firstHeader.samplesPerFrame() * 1000.0 / firstHeader.sampleRate();
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const double length = timePerFrame * d->xingHeader->totalFrames();
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d->length = static_cast<int>(length + 0.5);
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d->bitrate = static_cast<int>(d->xingHeader->totalSize() * 8.0 / length + 0.5);
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}
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else if(firstHeader.bitrate() > 0) {
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// Since there was no valid VBR header found, we hope that we're in a constant
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// bitrate file.
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// TODO: Make this more robust with audio property detection for VBR without a
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// Xing header.
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d->bitrate = firstHeader.bitrate();
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// Look for the last MPEG audio frame to calculate the stream length.
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const long lastFrameOffset = file->lastFrameOffset();
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if(lastFrameOffset < 0) {
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debug("MPEG::Properties::read() -- Could not find an MPEG frame in the stream.");
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return;
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}
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const Header lastHeader(file, lastFrameOffset, false);
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const long streamLength = lastFrameOffset - firstFrameOffset + lastHeader.frameLength();
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if(streamLength > 0)
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d->length = static_cast<int>(streamLength * 8.0 / d->bitrate + 0.5);
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}
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d->sampleRate = firstHeader.sampleRate();
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d->channels = firstHeader.channelMode() == Header::SingleChannel ? 1 : 2;
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d->version = firstHeader.version();
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d->layer = firstHeader.layer();
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d->protectionEnabled = firstHeader.protectionEnabled();
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d->channelMode = firstHeader.channelMode();
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d->isCopyrighted = firstHeader.isCopyrighted();
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d->isOriginal = firstHeader.isOriginal();
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}
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