LameXP/src/Encoder_MP3.cpp

///////////////////////////////////////////////////////////////////////////////
// LameXP - Audio Encoder Front-End
// Copyright (C) 2004-2010 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.
//
// 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 "Encoder_MP3.h"

#include "Global.h"
#include "Model_Settings.h"

#include <QProcess>
#include <QDir>

#define max(a,b) (((a) > (b)) ? (a) : (b))
#define min(a,b) (((a) < (b)) ? (a) : (b))
#define IS_UNICODE(STR) (qstricmp(STR.toUtf8().constData(), QString::fromLocal8Bit(STR.toLocal8Bit()).toUtf8().constData()))

MP3Encoder::MP3Encoder(void) : m_binary(lamexp_lookup_tool("lame.exe"))
{
	if(m_binary.isEmpty())
	{
		throw "Error initializing MP3 encoder. Tool 'lame.exe' is not registred!";
	}
}

MP3Encoder::~MP3Encoder(void)
{
}

bool MP3Encoder::encode(const AudioFileModel &sourceFile, const QString &outputFile, volatile bool *abortFlag)
{
	const QString baseName = QFileInfo(outputFile).fileName();
	emit statusUpdated(0);
	
	QProcess process;
	process.setProcessChannelMode(QProcess::MergedChannels);
	process.setReadChannel(QProcess::StandardOutput);

	QStringList args;
	args << "--nohist";
	args << "-h";
		
	switch(m_configRCMode)
	{
	case SettingsModel::VBRMode:
		args << "-V" << QString::number(9 - min(9, m_configBitrate));
		break;
	case SettingsModel::ABRMode:
		args << "--abr" << QString::number(SettingsModel::mp3Bitrates[min(13, m_configBitrate)]);
		break;
	case SettingsModel::CBRMode:
		args << "--cbr";
		args << "-b" << QString::number(SettingsModel::mp3Bitrates[min(13, m_configBitrate)]);
		break;
	default:
		throw "Bad rate-control mode!";
		break;
	}

	if(!sourceFile.fileName().isEmpty()) args << (IS_UNICODE(sourceFile.fileName()) ? "--uTitle" : "--lTitle") << sourceFile.fileName();
	if(!sourceFile.fileArtist().isEmpty()) args << (IS_UNICODE(sourceFile.fileArtist()) ? "--uArtist" : "--lArtist") << sourceFile.fileArtist();
	if(!sourceFile.fileAlbum().isEmpty()) args << (IS_UNICODE(sourceFile.fileAlbum()) ? "--uAlbum" : "--lAlbum") << sourceFile.fileAlbum();
	if(!sourceFile.fileGenre().isEmpty()) args << (IS_UNICODE(sourceFile.fileGenre()) ? "--uGenre" : "--lGenre") << sourceFile.fileGenre();
	if(!sourceFile.fileComment().isEmpty()) args << (IS_UNICODE(sourceFile.fileComment()) ? "--uComment" : "--lComment") << sourceFile.fileComment();
	if(sourceFile.fileYear()) args << "--ty" << QString::number(sourceFile.fileYear());
	if(sourceFile.filePosition()) args << "--tn" << QString::number(sourceFile.filePosition());
	
	//args << "--tv" << QString().sprintf("Encoder=LameXP v%d.%02d.%04d [%s]", lamexp_version_major(), lamexp_version_minor(), lamexp_version_build(), lamexp_version_release());

	args << QDir::toNativeSeparators(sourceFile.filePath());
	args << QDir::toNativeSeparators(outputFile);

	process.start(m_binary, args);
	if(!process.waitForStarted())
	{
		return false;
	}

	bool bTimeout = false;
	bool bAborted = false;

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

	while(process.state() != QProcess::NotRunning)
	{
		if(*abortFlag)
		{
			process.kill();
			bAborted = true;
			break;
		}
		process.waitForReadyRead();
		if(!process.bytesAvailable() && process.state() == QProcess::Running)
		{
			process.kill();
			qWarning("LAME process timed out <-- killing!");
			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())
			{
				qDebug("%s", text.toUtf8().constData());
			}
		}
	}

	process.waitForFinished();
	if(process.state() != QProcess::NotRunning)
	{
		process.kill();
		process.waitForFinished(-1);
	}

	if(bTimeout || bAborted || process.exitStatus() != QProcess::NormalExit)
	{
		return false;
	}
	
	return true;
}

QString MP3Encoder::extension(void)
{
	return "mp3";
}