LameXP/src/Filter_Downmix.cpp

///////////////////////////////////////////////////////////////////////////////
// LameXP - Audio Encoder Front-End
// Copyright (C) 2004-2017 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_Downmix.h"

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

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

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

#define IS_VALID(X) (((X) != 0U) && ((X) != UINT_MAX))

DownmixFilter::DownmixFilter(void)
:
	m_binary(lamexp_tools_lookup("sox.exe"))
{
	if(m_binary.isEmpty())
	{
		MUTILS_THROW("Error initializing SoX filter. Tool 'sox.exe' is not registred!");
	}
}

DownmixFilter::~DownmixFilter(void)
{
}

AbstractFilter::FilterResult DownmixFilter::apply(const QString &sourceFile, const QString &outputFile, AudioFileModel_TechInfo *const formatInfo, QAtomicInt &abortFlag)
{
	unsigned int channels = formatInfo->audioChannels();
	emit messageLogged(QString().sprintf("--> Number of channels is: %d\n", channels));

	if(IS_VALID(channels) && (channels <= 2))
	{
		messageLogged("Skipping downmix!");
		qDebug("Dowmmix not required/possible for Mono or Stereo input, skipping!");
		return AbstractFilter::FILTER_SKIPPED;
	}

	QProcess process;
	QStringList args;

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

	switch(channels)
	{
	case 3: //3.0 (L/R/C)
		args << "remix" << "1v0.66,3v0.34" << "2v0.66,3v0.34";
		break;
	case 4: //3.1 (L/R/C/LFE)
		args << "remix" << "1v0.5,3v0.25,4v0.25" << "2v0.5,3v0.25,4v0.25";
		break;
	case 5: //5.0 (L/R/C/BL/BR)
		args << "remix" << "1v0.5,3v0.25,4v0.25" << "2v0.5,3v0.25,5v0.25";
		break;
	case 6: //5.1 (L/R/C/LFE/BL/BR)
		args << "remix" << "1v0.4,3v0.2,4v0.2,5v0.2" << "2v0.4,3v0.2,4v0.2,6v0.2";
		break;
	case 7: //7.0 (L/R/C/BL/BR/SL/SR)
		args << "remix" << "1v0.4,3v0.2,4v0.2,6v0.2" << "2v0.4,3v0.2,5v0.2,7v0.2";
		break;
	case 8: //7.1 (L/R/C/LFE/BL/BR/SL/SR)
		args << "remix" << "1v0.36,3v0.16,4v0.16,5v0.16,7v0.16" << "2v0.36,3v0.16,4v0.16,6v0.16,8v0.16";
		break;
	case 9: //8.1 (L/R/C/LFE/BL/BR/SL/SR/BC)
		args << "remix" << "1v0.308,3v0.154,4v0.154,5v0.154,7v0.154,9v0.076" << "2v0.308,3v0.154,4v0.154,6v0.154,8v0.154,9v0.076";
		break;
	default: //Unknown
		qWarning("Downmixer: Unknown channel configuration!");
		args << "channels" << QString::number(2);
		break;
	}

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

	int prevProgress = -1;
	QRegExp regExp("In:(\\d+)(\\.\\d+)*%");

	const result_t result = awaitProcess(process, abortFlag, [this, &prevProgress, &regExp](const QString &text)
	{
		if (regExp.lastIndexIn(text) >= 0)
		{
			qint32 newProgress;
			if (MUtils::regexp_parse_int32(regExp, newProgress))
			{
				if (newProgress > prevProgress)
				{
					emit statusUpdated(newProgress);
					prevProgress = (newProgress < 99) ? (newProgress + 1) : newProgress;
				}
			}
			return true;
		}
		return false;
	});

	if (result != RESULT_SUCCESS)
	{
		return AbstractFilter::FILTER_FAILURE;
	}
	
	formatInfo->setAudioChannels(2);
	return AbstractFilter::FILTER_SUCCESS;
}