diff options
Diffstat (limited to 'kfile-plugins/wav/kfile_wav.cpp')
| -rw-r--r-- | kfile-plugins/wav/kfile_wav.cpp | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/kfile-plugins/wav/kfile_wav.cpp b/kfile-plugins/wav/kfile_wav.cpp new file mode 100644 index 00000000..4eda7bce --- /dev/null +++ b/kfile-plugins/wav/kfile_wav.cpp @@ -0,0 +1,173 @@ +/* This file is part of the KDE project + * Copyright (C) 2002 Ryan Cumming <bodnar42@phalynx.dhs.org> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation version 2. + * + * This program 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 + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; see the file COPYING. If not, write to + * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + * + */ + +#include <config.h> +#include "kfile_wav.h" + +#include <kprocess.h> +#include <klocale.h> +#include <kgenericfactory.h> +#include <kstringvalidator.h> +#include <kdebug.h> + +#include <qdict.h> +#include <qvalidator.h> +#include <qcstring.h> +#include <qfile.h> +#include <qdatetime.h> + +#if !defined(__osf__) +#include <inttypes.h> +#else +typedef unsigned short uint16_t; +typedef unsigned int uint32_t; +#endif + +typedef KGenericFactory<KWavPlugin> WavFactory; + +K_EXPORT_COMPONENT_FACTORY(kfile_wav, WavFactory( "kfile_wav" )) + +KWavPlugin::KWavPlugin(QObject *parent, const char *name, + const QStringList &args) + + : KFilePlugin(parent, name, args) +{ + KFileMimeTypeInfo* info = addMimeTypeInfo( "audio/x-wav" ); + + KFileMimeTypeInfo::GroupInfo* group = 0L; + + // "the" group + group = addGroupInfo(info, "Technical", i18n("Technical Details")); + + KFileMimeTypeInfo::ItemInfo* item; + + item = addItemInfo(group, "Sample Size", i18n("Sample Size"), QVariant::Int); + setSuffix(item, i18n(" bits")); + + item = addItemInfo(group, "Sample Rate", i18n("Sample Rate"), QVariant::Int); + setSuffix(item, i18n(" Hz")); + + item = addItemInfo(group, "Channels", i18n("Channels"), QVariant::Int); + + item = addItemInfo(group, "Length", i18n("Length"), QVariant::Int); + setAttributes(item, KFileMimeTypeInfo::Cummulative); + setUnit(item, KFileMimeTypeInfo::Seconds); +} + +bool KWavPlugin::readInfo( KFileMetaInfo& info, uint /*what*/) +{ + if ( info.path().isEmpty() ) // remote file + return false; + + QFile file(info.path()); + + uint32_t format_size; + uint16_t format_tag; + uint16_t channel_count; + uint32_t sample_rate; + uint32_t bytes_per_second; + uint16_t bytes_per_sample; + uint16_t sample_size; + uint32_t data_size; + uint32_t unknown_chunk_size; + uint16_t unknown_chunk16; + bool have_fmt = false; + bool have_data = false; + QIODevice::Offset file_length; + + const char *riff_signature = "RIFF"; + const char *wav_signature = "WAVE"; + const char *fmt_signature = "fmt "; + const char *data_signature = "data"; + char signature_buffer[4]; + + if (!file.open(IO_ReadOnly)) + { + kdDebug(7034) << "Couldn't open " << QFile::encodeName(info.path()) << endl; + return false; + } + + file_length = file.size() - 100; // a bit of insurance + QDataStream dstream(&file); + + // WAV files are little-endian + dstream.setByteOrder(QDataStream::LittleEndian); + + // Read and verify the RIFF signature + dstream.readRawBytes(signature_buffer, 4); + if (memcmp(signature_buffer, riff_signature, 4)) + return false; + + // Skip the next bit (total file size, pretty useless) + file.at(8); + + // Read and verify the WAVE signature + dstream.readRawBytes(signature_buffer, 4); + if (memcmp(signature_buffer, wav_signature, 4)) + return false; + + // pretty dumb scanner, but better than what we had! + do + { + dstream.readRawBytes(signature_buffer, 4); + if (!memcmp(signature_buffer, fmt_signature, 4)) { + dstream >> format_size; + dstream >> format_tag; + dstream >> channel_count; + dstream >> sample_rate; + dstream >> bytes_per_second; + dstream >> bytes_per_sample; + dstream >> sample_size; + have_fmt = true; + if ( format_size > 16 ) { + for (unsigned int i = 0; i < (format_size-16+1)/2; i++) + dstream >> unknown_chunk16; + } + } else if (!memcmp(signature_buffer, data_signature, 4)) { + dstream >> data_size; + have_data = true; + } else { + dstream >> unknown_chunk_size; + for (unsigned int i = 0; i < (unknown_chunk_size+1)/2; i++) + dstream >> unknown_chunk16; + } + if (have_data && have_fmt) + break; + } while (file.at() < file_length); + + if ( (!have_data) || (!have_fmt) ) + return false; + + // These values are downright illegal + if ((!channel_count) || (!bytes_per_second)) + return false; + + KFileMetaInfoGroup group = appendGroup(info, "Technical"); + + + appendItem(group, "Sample Size", int(sample_size)); + appendItem(group, "Sample Rate", int(sample_rate)); + appendItem(group, "Channels", int(channel_count)); + unsigned int wav_seconds = data_size / bytes_per_second; + appendItem(group, "Length", int(wav_seconds)); + + return true; +} + +#include "kfile_wav.moc" |