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/* This file is part of Strigi Desktop Search
*
* Copyright (C) 2007 Vincent Ricard <magic@magicninja.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "authroughanalyzer.h"
#include <strigi/strigiconfig.h>
#include <strigi/analysisresult.h>
#include <strigi/fieldtypes.h>
#include <strigi/textutils.h>
#include "rdfnamespaces.h"
using namespace std;
using namespace Strigi;
const string
musicClassName(
NMM_DRAFT "MusicPiece");
void
AuThroughAnalyzerFactory::registerFields(FieldRegister& reg) {
lengthField = reg.registerField(
NFO"duration");
sampleRateField = reg.registerField(
NFO"sampleRate");
channelsField = reg.registerField(
NFO"channels");
sampleBitDepthField = reg.registerField(
NFO"bitsPerSample");
sampleDataTypeField = reg.registerField(
"http://freedesktop.org/standards/xesam/1.0/core#audioSampleDataType");
typeField = reg.typeField;
addField(lengthField);
addField(sampleRateField);
addField(channelsField);
addField(sampleBitDepthField);
addField(sampleDataTypeField);
addField(typeField);
}
// Analyzer
void
AuThroughAnalyzer::setIndexable(AnalysisResult* i) {
analysisResult = i;
}
InputStream*
AuThroughAnalyzer::connectInputStream(InputStream* in) {
if (in == 0) return in;
const int32_t nreq = 24;
const char* buf;
int32_t nread = in->read(buf, nreq, nreq);
in->reset(0);
if (nread < nreq) {
return in;
}
/*
* description of the 'au'/u-law format:
* http://sox.sourceforge.net/AudioFormats-11.html#ss11.2
*/
// the file signature
const char sign[] = { 0x2e, 0x73, 0x6e, 0x64 };
if (strncmp(sign, buf, 4)) {
return in;
}
// we skip 8 bytes: 4 for the magic number + 4 for data pointer
uint32_t dataSize = readBigEndianUInt32(buf+8);
//uint32_t encoding = readBigEndianUInt32(buf+12);
uint32_t sampleRate = readBigEndianUInt32(buf+16);
uint32_t channels = readBigEndianUInt32(buf+20);
analysisResult->addValue(factory->sampleRateField, sampleRate);
analysisResult->addValue(factory->channelsField, channels);
uint16_t bytesPerSample = 0;
/* //FIXME: either get rid of this or replace with NIE equivalent
switch (encoding) {
case 1 :
analysisResult->addValue(factory->sampleDataTypeField, "ISDN u-law");
bytesPerSample = 1;
break;
case 2 :
analysisResult->addValue(factory->sampleDataTypeField, "linear PCM [REF-PCM]");
bytesPerSample = 1;
break;
case 3 :
analysisResult->addValue(factory->sampleDataTypeField, "linear PCM");
bytesPerSample = 2;
break;
case 4 :
analysisResult->addValue(factory->sampleDataTypeField, "linear PCM");
bytesPerSample = 3;
break;
case 5 :
analysisResult->addValue(factory->sampleDataTypeField, "linear PCM");
bytesPerSample = 4;
break;
case 6 :
analysisResult->addValue(factory->sampleDataTypeField, "IEEE floating point");
bytesPerSample = 4;
break;
case 7 :
analysisResult->addValue(factory->sampleDataTypeField, "IEEE floating point");
bytesPerSample = 8;
break;
case 23 :
analysisResult->addValue(factory->sampleDataTypeField, "ISDN u-law compressed");
bytesPerSample = 1;
break;
default :
analysisResult->addValue(factory->sampleDataTypeField, "Unknown");
bytesPerSample = 0;
}
*/
if(bytesPerSample) {
analysisResult->addValue(factory->sampleBitDepthField, bytesPerSample*8);
}
// work out length from bytespersample + channels + size
if ((0 < channels) && (0 < dataSize) && (dataSize != 0xFFFFFFFF) && (0 < bytesPerSample) && (0 < sampleRate)) {
uint32_t length = dataSize / channels / bytesPerSample / sampleRate;
analysisResult->addValue(factory->lengthField, length);
}
analysisResult->addValue(factory->typeField, musicClassName);
return in;
}
bool
AuThroughAnalyzer::isReadyWithStream() {
return true;
}
//Factory
class Factory : public AnalyzerFactoryFactory {
public:
list<StreamThroughAnalyzerFactory*>
streamThroughAnalyzerFactories() const {
list<StreamThroughAnalyzerFactory*> af;
af.push_back(new AuThroughAnalyzerFactory());
return af;
}
};
STRIGI_ANALYZER_FACTORY(Factory)
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