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/***************************************************************************
copyright : (C) 2006 by Lukáš Lalinský
email : [email protected]
copyright : (C) 2002 by Scott Wheeler
email : [email protected]
(original Vorbis implementation)
***************************************************************************/
/***************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License version *
* 2.1 as published by the Free Software Foundation. *
* *
* This library is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this library; if not, write to the Free Software *
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, *
* MA 02110-1301 USA *
***************************************************************************/
#include <tstring.h>
#if 0
#include <tdebug.h>
#endif
#include <oggpageheader.h>
#include "speexproperties.h"
#include "speexfile.h"
using namespace TagLib;
class Speex::Properties::PropertiesPrivate
{
public:
PropertiesPrivate(File *f, ReadStyle s) :
file(f),
style(s),
length(0),
bitrate(0),
sampleRate(0),
channels(0),
speexVersion(0),
vbr(false),
mode(0) {}
File *file;
ReadStyle style;
int length;
int bitrate;
int sampleRate;
int channels;
int speexVersion;
bool vbr;
int mode;
};
////////////////////////////////////////////////////////////////////////////////
// public members
////////////////////////////////////////////////////////////////////////////////
Speex::Properties::Properties(File *file, ReadStyle style) : AudioProperties(style)
{
d = new PropertiesPrivate(file, style);
read();
}
Speex::Properties::~Properties()
{
delete d;
}
int Speex::Properties::length() const
{
return d->length;
}
int Speex::Properties::bitrate() const
{
return int(float(d->bitrate) / float(1000) + 0.5);
}
int Speex::Properties::sampleRate() const
{
return d->sampleRate;
}
int Speex::Properties::channels() const
{
return d->channels;
}
int Speex::Properties::speexVersion() const
{
return d->speexVersion;
}
////////////////////////////////////////////////////////////////////////////////
// private members
////////////////////////////////////////////////////////////////////////////////
void Speex::Properties::read()
{
// Get the identification header from the Ogg implementation.
ByteVector data = d->file->packet(0);
int pos = 28;
// speex_version_id; /**< Version for Speex (for checking compatibility) */
d->speexVersion = data.mid(pos, 4).toUInt(false);
pos += 4;
// header_size; /**< Total size of the header ( sizeof(SpeexHeader) ) */
pos += 4;
// rate; /**< Sampling rate used */
d->sampleRate = data.mid(pos, 4).toUInt(false);
pos += 4;
// mode; /**< Mode used (0 for narrowband, 1 for wideband) */
d->mode = data.mid(pos, 4).toUInt(false);
pos += 4;
// mode_bitstream_version; /**< Version ID of the bit-stream */
pos += 4;
// nb_channels; /**< Number of channels encoded */
d->channels = data.mid(pos, 4).toUInt(false);
pos += 4;
// bitrate; /**< Bit-rate used */
d->bitrate = data.mid(pos, 4).toUInt(false);
pos += 4;
// frame_size; /**< Size of frames */
//unsigned int frameSize = data.mid(pos, 4).toUInt(false);
pos += 4;
// vbr; /**< 1 for a VBR encoding, 0 otherwise */
d->vbr = data.mid(pos, 4).toUInt(false) == 1;
pos += 4;
// frames_per_packet; /**< Number of frames stored per Ogg packet */
//unsigned int framesPerPacket = data.mid(pos, 4).toUInt(false);
const Ogg::PageHeader *first = d->file->firstPageHeader();
const Ogg::PageHeader *last = d->file->lastPageHeader();
if(first && last) {
long long start = first->absoluteGranularPosition();
long long end = last->absoluteGranularPosition();
if(start >= 0 && end >= 0 && d->sampleRate > 0)
d->length = (end - start) / (long long) d->sampleRate;
#if 0
else
debug("Speex::Properties::read() -- Either the PCM values for the start or "
"end of this file was incorrect or the sample rate is zero.");
#endif
}
#if 0
else
debug("Speex::Properties::read() -- Could not find valid first and last Ogg pages.");
#endif
}
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