172 lines
4.8 KiB
C++
172 lines
4.8 KiB
C++
/***************************************************************************
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copyright : (C) 2006 by Lukáš Lalinský
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email : lalinsky@gmail.com
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copyright : (C) 2004 by Allan Sandfeld Jensen
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email : kde@carewolf.org
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(original MPC implementation)
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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 <tstring.h>
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#include <tdebug.h>
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#include <bitset>
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#include "trueaudioproperties.h"
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#include "trueaudiofile.h"
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using namespace TagLib;
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class TrueAudio::Properties::PropertiesPrivate
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{
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public:
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PropertiesPrivate() :
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version(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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bitsPerSample(0),
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sampleFrames(0) {}
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int version;
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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 bitsPerSample;
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unsigned int sampleFrames;
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};
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////////////////////////////////////////////////////////////////////////////////
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// public members
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////////////////////////////////////////////////////////////////////////////////
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TrueAudio::Properties::Properties(const ByteVector &data, long streamLength, ReadStyle style) :
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AudioProperties(style),
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d(new PropertiesPrivate())
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{
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read(data, streamLength);
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}
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TrueAudio::Properties::~Properties()
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{
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delete d;
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}
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int TrueAudio::Properties::length() const
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{
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return lengthInSeconds();
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}
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int TrueAudio::Properties::lengthInSeconds() const
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{
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return d->length / 1000;
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}
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int TrueAudio::Properties::lengthInMilliseconds() const
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{
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return d->length;
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}
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int TrueAudio::Properties::bitrate() const
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{
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return d->bitrate;
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}
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int TrueAudio::Properties::sampleRate() const
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{
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return d->sampleRate;
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}
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int TrueAudio::Properties::bitsPerSample() const
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{
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return d->bitsPerSample;
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}
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int TrueAudio::Properties::channels() const
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{
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return d->channels;
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}
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unsigned int TrueAudio::Properties::sampleFrames() const
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{
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return d->sampleFrames;
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}
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int TrueAudio::Properties::ttaVersion() const
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{
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return d->version;
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}
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////////////////////////////////////////////////////////////////////////////////
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// private members
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////////////////////////////////////////////////////////////////////////////////
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void TrueAudio::Properties::read(const ByteVector &data, long streamLength)
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{
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if(data.size() < 4) {
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debug("TrueAudio::Properties::read() -- data is too short.");
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return;
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}
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if(!data.startsWith("TTA")) {
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debug("TrueAudio::Properties::read() -- invalid header signature.");
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return;
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}
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unsigned int pos = 3;
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d->version = data[pos] - '0';
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pos += 1;
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// According to http://en.true-audio.com/TTA_Lossless_Audio_Codec_-_Format_Description
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// TTA2 headers are in development, and have a different format
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if(1 == d->version) {
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if(data.size() < 18) {
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debug("TrueAudio::Properties::read() -- data is too short.");
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return;
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}
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// Skip the audio format
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pos += 2;
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d->channels = data.toShort(pos, false);
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pos += 2;
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d->bitsPerSample = data.toShort(pos, false);
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pos += 2;
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d->sampleRate = data.toUInt(pos, false);
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pos += 4;
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d->sampleFrames = data.toUInt(pos, false);
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pos += 4;
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if(d->sampleFrames > 0 && d->sampleRate > 0) {
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const double length = d->sampleFrames * 1000.0 / d->sampleRate;
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d->length = static_cast<int>(length + 0.5);
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d->bitrate = static_cast<int>(streamLength * 8.0 / length + 0.5);
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}
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}
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}
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