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172 lines
5.0 KiB
172 lines
5.0 KiB
/***************************************************************************
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copyright : (C) 2006 by Lukáš Lalinský
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email : lalinsky@gmail.com
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copyright : (C) 2002 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, *
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* MA 02110-1301 USA *
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***************************************************************************/
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#include <tstring.h>
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#if 0
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#include <tdebug.h>
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#endif
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#include <oggpageheader.h>
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#include "speexproperties.h"
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#include "speexfile.h"
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using namespace TagLib;
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class Speex::Properties::PropertiesPrivate
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{
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public:
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PropertiesPrivate(File *f, ReadStyle s) :
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file(f),
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style(s),
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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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speexVersion(0),
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vbr(false),
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mode(0) {}
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File *file;
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ReadStyle style;
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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 speexVersion;
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bool vbr;
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int mode;
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};
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////////////////////////////////////////////////////////////////////////////////
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// public members
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////////////////////////////////////////////////////////////////////////////////
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Speex::Properties::Properties(File *file, ReadStyle style) : AudioProperties(style)
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{
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d = new PropertiesPrivate(file, style);
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read();
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}
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Speex::Properties::~Properties()
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{
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delete d;
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}
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int Speex::Properties::length() const
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{
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return d->length;
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}
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int Speex::Properties::bitrate() const
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{
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return int(float(d->bitrate) / float(1000) + 0.5);
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}
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int Speex::Properties::sampleRate() const
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{
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return d->sampleRate;
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}
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int Speex::Properties::channels() const
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{
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return d->channels;
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}
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int Speex::Properties::speexVersion() const
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{
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return d->speexVersion;
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}
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////////////////////////////////////////////////////////////////////////////////
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// private members
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////////////////////////////////////////////////////////////////////////////////
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void Speex::Properties::read()
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{
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// Get the identification header from the Ogg implementation.
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ByteVector data = d->file->packet(0);
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int pos = 28;
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// speex_version_id; /**< Version for Speex (for checking compatibility) */
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d->speexVersion = data.mid(pos, 4).toUInt(false);
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pos += 4;
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// header_size; /**< Total size of the header ( sizeof(SpeexHeader) ) */
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pos += 4;
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// rate; /**< Sampling rate used */
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d->sampleRate = data.mid(pos, 4).toUInt(false);
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pos += 4;
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// mode; /**< Mode used (0 for narrowband, 1 for wideband) */
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d->mode = data.mid(pos, 4).toUInt(false);
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pos += 4;
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// mode_bitstream_version; /**< Version ID of the bit-stream */
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pos += 4;
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// nb_channels; /**< Number of channels encoded */
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d->channels = data.mid(pos, 4).toUInt(false);
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pos += 4;
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// bitrate; /**< Bit-rate used */
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d->bitrate = data.mid(pos, 4).toUInt(false);
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pos += 4;
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// frame_size; /**< Size of frames */
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//unsigned int frameSize = data.mid(pos, 4).toUInt(false);
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pos += 4;
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// vbr; /**< 1 for a VBR encoding, 0 otherwise */
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d->vbr = data.mid(pos, 4).toUInt(false) == 1;
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pos += 4;
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// frames_per_packet; /**< Number of frames stored per Ogg packet */
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//unsigned int framesPerPacket = data.mid(pos, 4).toUInt(false);
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const Ogg::PageHeader *first = d->file->firstPageHeader();
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const Ogg::PageHeader *last = d->file->lastPageHeader();
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if(first && last) {
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long long start = first->absoluteGranularPosition();
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long long end = last->absoluteGranularPosition();
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if(start >= 0 && end >= 0 && d->sampleRate > 0)
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d->length = (end - start) / (long long) d->sampleRate;
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#if 0
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else
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debug("Speex::Properties::read() -- Either the PCM values for the start or "
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"end of this file was incorrect or the sample rate is zero.");
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#endif
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}
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#if 0
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else
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debug("Speex::Properties::read() -- Could not find valid first and last Ogg pages.");
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#endif
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}
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