diff options
Diffstat (limited to 'libs/taglib/taglib/ogg/vorbis/vorbisproperties.cpp')
| -rw-r--r-- | libs/taglib/taglib/ogg/vorbis/vorbisproperties.cpp | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/libs/taglib/taglib/ogg/vorbis/vorbisproperties.cpp b/libs/taglib/taglib/ogg/vorbis/vorbisproperties.cpp new file mode 100644 index 0000000000..c82a3191f3 --- /dev/null +++ b/libs/taglib/taglib/ogg/vorbis/vorbisproperties.cpp @@ -0,0 +1,183 @@ +/*************************************************************************** + copyright : (C) 2002 - 2008 by Scott Wheeler + email : wheeler@kde.org + ***************************************************************************/ + +/*************************************************************************** + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * + * USA * + * * + * Alternatively, this file is available under the Mozilla Public * + * License Version 1.1. You may obtain a copy of the License at * + * http://www.mozilla.org/MPL/ * + ***************************************************************************/ + +#include <tstring.h> +#include <tdebug.h> + +#include <oggpageheader.h> + +#include "vorbisproperties.h" +#include "vorbisfile.h" + +using namespace TagLib; + +class Vorbis::Properties::PropertiesPrivate +{ +public: + PropertiesPrivate(File *f, ReadStyle s) : + file(f), + style(s), + length(0), + bitrate(0), + sampleRate(0), + channels(0), + vorbisVersion(0), + bitrateMaximum(0), + bitrateNominal(0), + bitrateMinimum(0) {} + + File *file; + ReadStyle style; + int length; + int bitrate; + int sampleRate; + int channels; + int vorbisVersion; + int bitrateMaximum; + int bitrateNominal; + int bitrateMinimum; +}; + +namespace TagLib { + /*! + * Vorbis headers can be found with one type ID byte and the string "vorbis" in + * an Ogg stream. 0x01 indicates the setup header. + */ + static const char vorbisSetupHeaderID[] = { 0x01, 'v', 'o', 'r', 'b', 'i', 's', 0 }; +} + +//////////////////////////////////////////////////////////////////////////////// +// public members +//////////////////////////////////////////////////////////////////////////////// + +Vorbis::Properties::Properties(File *file, ReadStyle style) : AudioProperties(style) +{ + d = new PropertiesPrivate(file, style); + read(); +} + +Vorbis::Properties::~Properties() +{ + delete d; +} + +int Vorbis::Properties::length() const +{ + return d->length; +} + +int Vorbis::Properties::bitrate() const +{ + return int(float(d->bitrate) / float(1000) + 0.5); +} + +int Vorbis::Properties::sampleRate() const +{ + return d->sampleRate; +} + +int Vorbis::Properties::channels() const +{ + return d->channels; +} + +int Vorbis::Properties::vorbisVersion() const +{ + return d->vorbisVersion; +} + +int Vorbis::Properties::bitrateMaximum() const +{ + return d->bitrateMaximum; +} + +int Vorbis::Properties::bitrateNominal() const +{ + return d->bitrateNominal; +} + +int Vorbis::Properties::bitrateMinimum() const +{ + return d->bitrateMinimum; +} + +//////////////////////////////////////////////////////////////////////////////// +// private members +//////////////////////////////////////////////////////////////////////////////// + +void Vorbis::Properties::read() +{ + // Get the identification header from the Ogg implementation. + + ByteVector data = d->file->packet(0); + + int pos = 0; + + if(data.mid(pos, 7) != vorbisSetupHeaderID) { + debug("Vorbis::Properties::read() -- invalid Vorbis identification header"); + return; + } + + pos += 7; + + d->vorbisVersion = data.mid(pos, 4).toUInt(false); + pos += 4; + + d->channels = uchar(data[pos]); + pos += 1; + + d->sampleRate = data.mid(pos, 4).toUInt(false); + pos += 4; + + d->bitrateMaximum = data.mid(pos, 4).toUInt(false); + pos += 4; + + d->bitrateNominal = data.mid(pos, 4).toUInt(false); + pos += 4; + + d->bitrateMinimum = data.mid(pos, 4).toUInt(false); + + // TODO: Later this should be only the "fast" mode. + d->bitrate = d->bitrateNominal; + + // Find the length of the file. See http://wiki.xiph.org/VorbisStreamLength/ + // for my notes on the topic. + + 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; + else + debug("Vorbis::Properties::read() -- Either the PCM values for the start or " + "end of this file was incorrect or the sample rate is zero."); + } + else + debug("Vorbis::Properties::read() -- Could not find valid first and last Ogg pages."); +} |