LameXP/src/Filter_Resample.cpp

///////////////////////////////////////////////////////////////////////////////
// LameXP - Audio Encoder Front-End
// Copyright (C) 2004-2016 LoRd_MuldeR <MuldeR2@GMX.de>
//
// 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; either version 2 of the License, or
// (at your option) any later version, but always including the *additional*
// restrictions defined in the "License.txt" file.
//
// 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; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// http://www.gnu.org/licenses/gpl-2.0.txt
///////////////////////////////////////////////////////////////////////////////

#include "Filter_Resample.h"

//Internal
#include "Global.h"
#include "Model_AudioFile.h"

//MUtils
#include <MUtils/Exception.h>

//Qt
#include <QDir>
#include <QProcess>
#include <QRegExp>

static __inline int multipleOf(int value, int base)
{
	return qRound(static_cast<double>(value) / static_cast<double>(base)) * base;
}

ResampleFilter::ResampleFilter(int samplingRate, int bitDepth)
:
	m_binary(lamexp_tools_lookup("sox.exe"))
{
	if(m_binary.isEmpty())
	{
		MUTILS_THROW("Error initializing SoX filter. Tool 'sox.exe' is not registred!");
	}

	m_samplingRate = (samplingRate > 0) ? qBound(8000, samplingRate, 192000) : 0;
	m_bitDepth = (bitDepth > 0) ? qBound(8, multipleOf(bitDepth, 8), 32) : 0;

	if((m_samplingRate == 0) && (m_bitDepth == 0))
	{
		qWarning("ResampleFilter: Nothing to do, filter will be NOP!");
	}
}

ResampleFilter::~ResampleFilter(void)
{
}

AbstractFilter::FilterResult ResampleFilter::apply(const QString &sourceFile, const QString &outputFile, AudioFileModel_TechInfo *const formatInfo, volatile bool *abortFlag)
{
	QProcess process;
	QStringList args;

	if((m_samplingRate == formatInfo->audioSamplerate()) && (m_bitDepth == formatInfo->audioBitdepth()))
	{
		messageLogged("Skipping resample filter!");
		qDebug("Resampling filter target samplerate/bitdepth is equals to the format of the input file, skipping!");
		return AbstractFilter::FILTER_SKIPPED;
	}

	args << "-V3" << "-S";
	args << "--guard" << "--temp" << ".";
	args << QDir::toNativeSeparators(sourceFile);

	if(m_bitDepth)
	{
		args << "-b" << QString::number(m_bitDepth);
	}

	args << QDir::toNativeSeparators(outputFile);

	if(m_samplingRate)
	{
		args << "rate";
		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)
		args << ((m_samplingRate > 40000) ? "-L" : "-I");	//if resampling to < 40k, use intermediate phase (-I), otherwise use linear phase (-L)
		args << QString::number(m_samplingRate);
	}

	if((m_bitDepth || m_samplingRate) && (m_bitDepth <= 16))
	{
		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
	}

	if(!startProcess(process, m_binary, args, QFileInfo(outputFile).canonicalPath()))
	{
		return AbstractFilter::FILTER_FAILURE;
	}

	bool bTimeout = false;
	bool bAborted = false;

	QRegExp regExp("In:(\\d+)(\\.\\d+)*%");

	while(process.state() != QProcess::NotRunning)
	{
		if(*abortFlag)
		{
			process.kill();
			bAborted = true;
			emit messageLogged("\nABORTED BY USER !!!");
			break;
		}
		process.waitForReadyRead(m_processTimeoutInterval);
		if(!process.bytesAvailable() && process.state() == QProcess::Running)
		{
			process.kill();
			qWarning("SoX process timed out <-- killing!");
			emit messageLogged("\nPROCESS TIMEOUT !!!");
			bTimeout = true;
			break;
		}
		while(process.bytesAvailable() > 0)
		{
			QByteArray line = process.readLine();
			QString text = QString::fromUtf8(line.constData()).simplified();
			if(regExp.lastIndexIn(text) >= 0)
			{
				bool ok = false;
				int progress = regExp.cap(1).toInt(&ok);
				if(ok) emit statusUpdated(progress);
			}
			else if(!text.isEmpty())
			{
				emit messageLogged(text);
			}
		}
	}

	process.waitForFinished();
	if(process.state() != QProcess::NotRunning)
	{
		process.kill();
		process.waitForFinished(-1);
	}
	
	emit statusUpdated(100);
	emit messageLogged(QString().sprintf("\nExited with code: 0x%04X", process.exitCode()));

	if(bTimeout || bAborted || process.exitCode() != EXIT_SUCCESS || QFileInfo(outputFile).size() == 0)
	{
		return AbstractFilter::FILTER_FAILURE;
	}
	
	if(m_samplingRate)
		formatInfo->setAudioSamplerate(m_samplingRate);
	if(m_bitDepth)
		formatInfo->setAudioBitdepth(m_bitDepth);

	return AbstractFilter::FILTER_SUCCESS;
}