src/Filter_Resample.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // LameXP - Audio Encoder Front-End
   3 // Copyright (C) 2004-2017 LoRd_MuldeR <MuldeR2@GMX.de>
   4 //
   5 // This program is free software; you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation; either version 2 of the License, or
   8 // (at your option) any later version, but always including the *additional*
   9 // restrictions defined in the "License.txt" file.
  10 //
  11 // This program is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License along
  17 // with this program; if not, write to the Free Software Foundation, Inc.,
  18 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 //
  20 // http://www.gnu.org/licenses/gpl-2.0.txt
  21 ///////////////////////////////////////////////////////////////////////////////
  22
  23 #include "Filter_Resample.h"
  24
  25 //Internal
  26 #include "Global.h"
  27 #include "Model_AudioFile.h"
  28
  29 //MUtils
  30 #include <MUtils/Exception.h>
  31
  32 //Qt
  33 #include <QDir>
  34 #include <QProcess>
  35 #include <QRegExp>
  36
  37 static __inline int multipleOf(int value, int base)
  38 {
  39         return qRound(static_cast<double>(value) / static_cast<double>(base)) * base;
  40 }
  41
  42 ResampleFilter::ResampleFilter(int samplingRate, int bitDepth)
  43 :
  44         m_binary(lamexp_tools_lookup("sox.exe"))
  45 {
  46         if(m_binary.isEmpty())
  47         {
  48                 MUTILS_THROW("Error initializing SoX filter. Tool 'sox.exe' is not registred!");
  49         }
  50
  51         m_samplingRate = (samplingRate > 0) ? qBound(8000, samplingRate, 192000) : 0;
  52         m_bitDepth = (bitDepth > 0) ? qBound(8, multipleOf(bitDepth, 8), 32) : 0;
  53
  54         if((m_samplingRate == 0) && (m_bitDepth == 0))
  55         {
  56                 qWarning("ResampleFilter: Nothing to do, filter will be NOP!");
  57         }
  58 }
  59
  60 ResampleFilter::~ResampleFilter(void)
  61 {
  62 }
  63
  64 AbstractFilter::FilterResult ResampleFilter::apply(const QString &sourceFile, const QString &outputFile, AudioFileModel_TechInfo *const formatInfo, QAtomicInt &abortFlag)
  65 {
  66         QProcess process;
  67         QStringList args;
  68
  69         if((m_samplingRate == formatInfo->audioSamplerate()) && (m_bitDepth == formatInfo->audioBitdepth()))
  70         {
  71                 messageLogged("Skipping resample filter!");
  72                 qDebug("Resampling filter target samplerate/bitdepth is equals to the format of the input file, skipping!");
  73                 return AbstractFilter::FILTER_SKIPPED;
  74         }
  75
  76         args << "-V3" << "-S";
  77         args << "--guard" << "--temp" << ".";
  78         args << QDir::toNativeSeparators(sourceFile);
  79
  80         if(m_bitDepth)
  81         {
  82                 args << "-b" << QString::number(m_bitDepth);
  83         }
  84
  85         args << QDir::toNativeSeparators(outputFile);
  86
  87         if(m_samplingRate)
  88         {
  89                 args << "rate";
  90                 args << ((m_bitDepth > 16) ? "-v" : "-h");                      //if resampling at/to > 16 bit depth (i.e. most commonly 24-bit), use VHQ (-v), otherwise, use HQ (-h)
  91                 args << ((m_samplingRate > 40000) ? "-L" : "-I");       //if resampling to < 40k, use intermediate phase (-I), otherwise use linear phase (-L)
  92                 args << QString::number(m_samplingRate);
  93         }
  94
  95         if((m_bitDepth || m_samplingRate) && (m_bitDepth <= 16))
  96         {
  97                 args << "dither" << "-s";                                       //if you're mastering to 16-bit, you also need to add 'dither' (and in most cases noise-shaping) after the rate
  98         }
  99
 100         if(!startProcess(process, m_binary, args, QFileInfo(outputFile).canonicalPath()))
 101         {
 102                 return AbstractFilter::FILTER_FAILURE;
 103         }
 104
 105         int prevProgress = -1;
 106         QRegExp regExp("In:(\\d+)(\\.\\d+)*%");
 107
 108         const result_t result = awaitProcess(process, abortFlag, [this, &prevProgress, &regExp](const QString &text)
 109         {
 110                 if (regExp.lastIndexIn(text) >= 0)
 111                 {
 112                         qint32 newProgress;
 113                         if (MUtils::regexp_parse_int32(regExp, newProgress))
 114                         {
 115                                 if (newProgress > prevProgress)
 116                                 {
 117                                         emit statusUpdated(newProgress);
 118                                         prevProgress = NEXT_PROGRESS(newProgress);
 119                                 }
 120                         }
 121                         return true;
 122                 }
 123                 return false;
 124         });
 125
 126         if (result != RESULT_SUCCESS)
 127         {
 128                 return AbstractFilter::FILTER_FAILURE;
 129         }
 130
 131         if (m_samplingRate)
 132         {
 133                 formatInfo->setAudioSamplerate(m_samplingRate);
 134         }
 135         if (m_bitDepth)
 136         {
 137                 formatInfo->setAudioBitdepth(m_bitDepth);
 138         }
 139
 140         return AbstractFilter::FILTER_SUCCESS;
 141 }