178 lines
5.1 KiB
C++
178 lines
5.1 KiB
C++
/***************************************************************************
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copyright : (C) 2012 by Lukáš Lalinský
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email : lalinsky@gmail.com
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copyright : (C) 2002 - 2008 by Scott Wheeler
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email : wheeler@kde.org
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(original Vorbis 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 <oggpageheader.h>
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#include "opusproperties.h"
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#include "opusfile.h"
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using namespace TagLib;
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using namespace TagLib::Ogg;
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class Opus::Properties::PropertiesPrivate
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{
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public:
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PropertiesPrivate() :
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length(0),
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bitrate(0),
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inputSampleRate(0),
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channels(0),
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opusVersion(0) {}
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int length;
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int bitrate;
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int inputSampleRate;
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int channels;
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int opusVersion;
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};
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////////////////////////////////////////////////////////////////////////////////
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// public members
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////////////////////////////////////////////////////////////////////////////////
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Opus::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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Opus::Properties::~Properties()
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{
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delete d;
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}
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int Opus::Properties::length() const
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{
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return lengthInSeconds();
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}
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int Ogg::Opus::Properties::lengthInSeconds() const
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{
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return d->length / 1000;
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}
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int Ogg::Opus::Properties::lengthInMilliseconds() const
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{
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return d->length;
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}
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int Opus::Properties::bitrate() const
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{
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return d->bitrate;
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}
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int Opus::Properties::sampleRate() const
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{
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// Opus can decode any stream at a sample rate of 8, 12, 16, 24, or 48 kHz,
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// so there is no single sample rate. Let's assume it's the highest
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// possible.
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return 48000;
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}
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int Opus::Properties::channels() const
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{
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return d->channels;
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}
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int Opus::Properties::inputSampleRate() const
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{
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return d->inputSampleRate;
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}
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int Opus::Properties::opusVersion() const
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{
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return d->opusVersion;
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}
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////////////////////////////////////////////////////////////////////////////////
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// private members
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////////////////////////////////////////////////////////////////////////////////
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void Opus::Properties::read(File *file)
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{
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// Get the identification header from the Ogg implementation.
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// http://tools.ietf.org/html/draft-terriberry-oggopus-01#section-5.1
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const ByteVector data = file->packet(0);
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// *Magic Signature*
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uint pos = 8;
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// *Version* (8 bits, unsigned)
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d->opusVersion = uchar(data.at(pos));
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pos += 1;
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// *Output Channel Count* 'C' (8 bits, unsigned)
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d->channels = uchar(data.at(pos));
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pos += 1;
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// *Pre-skip* (16 bits, unsigned, little endian)
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const ushort preSkip = data.toUShort(pos, false);
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pos += 2;
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// *Input Sample Rate* (32 bits, unsigned, little endian)
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d->inputSampleRate = data.toUInt(pos, false);
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pos += 4;
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// *Output Gain* (16 bits, signed, little endian)
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pos += 2;
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// *Channel Mapping Family* (8 bits, unsigned)
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pos += 1;
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const Ogg::PageHeader *first = file->firstPageHeader();
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const Ogg::PageHeader *last = file->lastPageHeader();
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if(first && last) {
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const long long start = first->absoluteGranularPosition();
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const long long end = last->absoluteGranularPosition();
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if(start >= 0 && end >= 0) {
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const long long frameCount = (end - start - preSkip);
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if(frameCount > 0) {
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const double length = frameCount * 1000.0 / 48000.0;
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d->length = static_cast<int>(length + 0.5);
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d->bitrate = static_cast<int>(file->length() * 8.0 / length + 0.5);
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}
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}
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else {
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debug("Opus::Properties::read() -- The PCM values for the start or "
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"end of this file was incorrect.");
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}
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}
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else
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debug("Opus::Properties::read() -- Could not find valid first and last Ogg pages.");
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}
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