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/*
* Cantata
*
* Copyright (c) 2011-2022 Craig Drummond <craig.p.drummond@gmail.com>
*
* Large portions of this file, mainly the textual descriptions, etc, are taken from
* Amarok - hence the (c) notice below...
*/
/****************************************************************************************
* Copyright (c) 2010 Téo Mrnjavac <teo@kde.org> *
* *
* 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 Encoder. *
* *
* You should have received a copy of the GNU General Public License along with *
* this program. If not, see <http://www.gnu.org/licenses/>. *
****************************************************************************************/
#include "encoders.h"
#include "config.h"
#include "support/utils.h"
#include <QProcess>
#include <QRegularExpression>
#include <algorithm>
namespace Encoders {
static QList<Encoder> installedEncoders;
static bool usingAvconv = false;
static void insertCodec(const QString& cmd, const QString& param, const QString& outputParam, Encoder& enc)
{
QString command = Utils::findExe(cmd);
if (!command.isEmpty()) {
int index = installedEncoders.indexOf(enc);
enc.codec = cmd;
enc.param = param;
enc.transcoder = false;
enc.app = command;
enc.outputParam = outputParam;
if (-1 != index) {
Encoder orig = installedEncoders.takeAt(index);
orig.name += usingAvconv ? QLatin1String(" (avconv)") : QLatin1String(" (ffmpeg)");
installedEncoders.insert(index, orig);
enc.name += QLatin1String(" (") + cmd + QChar(')');
installedEncoders.insert(index + 1, enc);
}
else {
installedEncoders.append(enc);
}
}
}
static void init()
{
static bool initialised = false;
if (!initialised) {
initialised = true;
QString command = Utils::findExe(QLatin1String("ffmpeg"));
if (command.isEmpty()) {
command = Utils::findExe(QLatin1String("avconv"));
usingAvconv = true;
}
QByteArray vbr = "~%1kb/s VBR";
QByteArray cbr = "%1kb/s CBR";
QByteArray quality = "%1 (~%2kb/s VBR)";
Encoder aacFaac(QLatin1String("AAC (libfaac)"),
QObject::tr("<a href=http://en.wikipedia.org/wiki/Advanced_Audio_Coding>Advanced Audio "
"Coding</a> (AAC) is a patented lossy codec for digital audio.<br>AAC "
"generally achieves better sound quality than MP3 at similar bit rates. "
"It is a reasonable choice for the iPod and some other portable music "
"players."),
QObject::tr("The bitrate is a measure of the quantity of data used to represent a second "
"of the audio track.<br>The <b>AAC</b> encoder used by Cantata supports a <a href="
"http://en.wikipedia.org/wiki/Variable_bitrate#Advantages_and_disadvantages_of_VBR"
">variable bitrate (VBR)</a> setting, which means that the bitrate value "
"fluctuates along the track based on the complexity of the audio content. "
"More complex intervals of data are encoded with a higher bitrate than less "
"complex ones; this approach yields overall better quality and a smaller file "
"than having a constant bitrate throughout the track.<br>"
"For this reason, the bitrate measure in this slider is just an estimate "
"of the <a href=http://www.ffmpeg.org/faq.html#SEC21>average bitrate</a> of "
"the encoded track.<br>"
"<b>150kb/s</b> is a good choice for music listening on a portable player.<br/>"
"Anything below <b>100kb/s</b> might be unsatisfactory for music and anything above "
"<b>200kb/s</b> is probably overkill."),
QLatin1String("m4a"),
command,
QLatin1String("libfaac"),
QLatin1String("-aq"),
QObject::tr("Expected average bitrate for variable bitrate encoding"),
QList<Setting>() << Setting(QObject::tr(vbr).arg(55), 30)
<< Setting(QObject::tr(vbr).arg(75), 55)
<< Setting(QObject::tr(vbr).arg(100), 80)
<< Setting(QObject::tr(vbr).arg(125), 105)
<< Setting(QObject::tr(vbr).arg(150), 125)
<< Setting(QObject::tr(vbr).arg(170), 155)
<< Setting(QObject::tr(vbr).arg(180), 180)
<< Setting(QObject::tr(vbr).arg(190), 205)
<< Setting(QObject::tr(vbr).arg(200), 230)
<< Setting(QObject::tr(vbr).arg(210), 255)
<< Setting(QObject::tr(vbr).arg(220), 280),
QObject::tr("Smaller file"),
QObject::tr("Better sound quality"),
4);
Encoder aac(QLatin1String("AAC"),
aacFaac.description, aacFaac.tooltip, aacFaac.extension, aacFaac.app, QLatin1String("aac"),
QLatin1String("-b:a"), QObject::tr("Bitrate"),
QList<Setting>() << Setting(QObject::tr(cbr).arg(64), 64)
<< Setting(QObject::tr(cbr).arg(96), 96)
<< Setting(QObject::tr(cbr).arg(128), 128)
<< Setting(QObject::tr(cbr).arg(160), 160)
<< Setting(QObject::tr(cbr).arg(192), 192)
<< Setting(QObject::tr(cbr).arg(224), 224)
<< Setting(QObject::tr(cbr).arg(256), 256)
<< Setting(QObject::tr(cbr).arg(320), 320)
<< Setting(QObject::tr(cbr).arg(384), 384),
aacFaac.low, aacFaac.high, 3, 1000);
Encoder aacFdk(QLatin1String("AAC (libfdk_aac)"),
aac.description, aac.tooltip, aac.extension, aac.app, QLatin1String("libfdk_aac"),
aac.param, aac.valueLabel, aac.values, aac.low, aac.high, 3);
Encoder lame(QLatin1String("MP3"),
QObject::tr("<a href=http://en.wikipedia.org/wiki/MP3>MPEG Audio Layer 3</a> (MP3) is "
"a patented digital audio codec using a form of lossy data compression."
"<br>In spite of its shortcomings, it is a common format for consumer "
"audio storage, and is widely supported on portable music players."),
QObject::tr("The bitrate is a measure of the quantity of data used to represent a "
"second of the audio track.<br>The <b>MP3</b> encoder used by Cantata supports "
"a <a href=http://en.wikipedia.org/wiki/MP3#VBR>variable bitrate (VBR)</a> "
"setting, which means that the bitrate value fluctuates along the track "
"based on the complexity of the audio content. More complex intervals of "
"data are encoded with a higher bitrate than less complex ones; this "
"approach yields overall better quality and a smaller file than having a "
"constant bitrate throughout the track.<br>"
"For this reason, the bitrate measure in this slider is just an estimate "
"of the average bitrate of the encoded track.<br>"
"<b>160kb/s</b> is a good choice for music listening on a portable player.<br/>"
"Anything below <b>120kb/s</b> might be unsatisfactory for music and anything above "
"<b>220kb/s</b> is probably overkill."),
QLatin1String("mp3"),
command,
QLatin1String("libmp3lame"),
QLatin1String("-aq"),
QObject::tr("Expected average bitrate for variable bitrate encoding"),
QList<Setting>() << Setting(QObject::tr(vbr).arg(65), 9)
<< Setting(QObject::tr(vbr).arg(85), 8)
<< Setting(QObject::tr(vbr).arg(100), 7)
<< Setting(QObject::tr(vbr).arg(120), 6)
<< Setting(QObject::tr(vbr).arg(135), 5)
<< Setting(QObject::tr(vbr).arg(160), 4)
<< Setting(QObject::tr(vbr).arg(175), 3)
<< Setting(QObject::tr(vbr).arg(190), 2)
<< Setting(QObject::tr(vbr).arg(220), 1)
<< Setting(QObject::tr(vbr).arg(240), 0),
QObject::tr("Smaller file"),
QObject::tr("Better sound quality"),
5);
Encoder ogg(QObject::tr("Ogg Vorbis"),
QObject::tr("<a href=http://en.wikipedia.org/wiki/Vorbis>Ogg Vorbis</a> is an open "
"and royalty-free audio codec for lossy audio compression.<br>It produces "
"smaller files than MP3 at equivalent or higher quality. Ogg Vorbis is an "
"all-around excellent choice, especially for portable music players that "
"support it."),
QObject::tr("The bitrate is a measure of the quantity of data used to represent a "
"second of the audio track.<br>The <b>Vorbis</b> encoder used by Cantata supports "
"a <a href=http://en.wikipedia.org/wiki/Vorbis#Technical_Encoder>variable bitrate "
"(VBR)</a> setting, which means that the bitrate value fluctuates along the track "
"based on the complexity of the audio content. More complex intervals of "
"data are encoded with a higher bitrate than less complex ones; this "
"approach yields overall better quality and a smaller file than having a "
"constant bitrate throughout the track.<br>"
"The Vorbis encoder uses a quality rating between -1 and 10 to define "
"a certain expected audio quality level. The bitrate measure in this slider is "
"just a rough estimate (provided by Vorbis) of the average bitrate of the encoded "
"track given a quality value. In fact, with newer and more efficient Vorbis versions the "
"actual bitrate is even lower.<br>"
"<b>5</b> is a good choice for music listening on a portable player.<br/>"
"Anything below <b>3</b> might be unsatisfactory for music and anything above "
"<b>8</b> is probably overkill."),
QLatin1String("ogg"),
command,
QLatin1String("libvorbis"),
QLatin1String("-aq"),
QObject::tr("Quality rating"),
QList<Setting>() << Setting(QObject::tr(quality).arg(-1).arg(45), -1)
<< Setting(QObject::tr(quality).arg(0).arg(64), 0)
<< Setting(QObject::tr(quality).arg(1).arg(80), 1)
<< Setting(QObject::tr(quality).arg(2).arg(96), 2)
<< Setting(QObject::tr(quality).arg(3).arg(112), 3)
<< Setting(QObject::tr(quality).arg(4).arg(128), 4)
<< Setting(QObject::tr(quality).arg(5).arg(160), 5)
<< Setting(QObject::tr(quality).arg(6).arg(192), 6)
<< Setting(QObject::tr(quality).arg(7).arg(224), 7)
<< Setting(QObject::tr(quality).arg(8).arg(256), 8)
<< Setting(QObject::tr(quality).arg(9).arg(320), 9)
<< Setting(QObject::tr(quality).arg(10).arg(384), 10),
QObject::tr("Smaller file"),
QObject::tr("Better sound quality"),
6);
Encoder opus(QObject::tr("Opus"),
QObject::tr("<a href=http://en.wikipedia.org/wiki/Opus_(audio_format)>Opus</a> is "
"a patent-free digital audio codec using a form of lossy data compression."),
QObject::tr("The bitrate is a measure of the quantity of data used to represent a "
"second of the audio track.<br>The <b>Opus</b> encoder used by Cantata supports "
"a <a href=http://en.wikipedia.org/wiki/Variable_bitrate>variable bitrate (VBR)</a> "
"setting, which means that the bitrate value fluctuates along the track "
"based on the complexity of the audio content. More complex intervals of "
"data are encoded with a higher bitrate than less complex ones; this "
"approach yields overall better quality and a smaller file than having a "
"constant bitrate throughout the track.<br>"
"For this reason, the bitrate measure in this slider is just an estimate "
"of the average bitrate of the encoded track.<br>"
"<b>128kb/s</b> is a good choice for music listening on a portable player.<br/>"
"Anything below <b>96kb/s</b> might be unsatisfactory for music and anything above "
"<b>256kb/s</b> is probably overkill."),
QLatin1String("opus"),
command,
QLatin1String("libopus"),
QLatin1String("-ab"),
QObject::tr("Bitrate"),
QList<Setting>() << Setting(QObject::tr(vbr).arg(32), 32)
<< Setting(QObject::tr(vbr).arg(64), 64)
<< Setting(QObject::tr(vbr).arg(96), 96)
<< Setting(QObject::tr(vbr).arg(128), 128)
<< Setting(QObject::tr(vbr).arg(160), 160)
<< Setting(QObject::tr(vbr).arg(192), 192)
<< Setting(QObject::tr(vbr).arg(256), 256)
<< Setting(QObject::tr(vbr).arg(320), 320)
<< Setting(QObject::tr(vbr).arg(384), 384),
QObject::tr("Smaller file"),
QObject::tr("Better sound quality"),
3,
1000);
if (!command.isEmpty()) {
QList<Encoder> initial;
initial.append(aacFaac);
initial.append(aac);
initial.append(aacFdk);
initial.append(
Encoder(QObject::tr("Apple Lossless"),
QObject::tr("<a href=http://en.wikipedia.org/wiki/Apple_Lossless>Apple Lossless</a> "
"(ALAC) is an audio codec for lossless compression of digital music.<br>"
"Recommended only for Apple music players and players that do not support "
"FLAC."),
QString(),
QLatin1String("m4a"),
command,
QLatin1String("alac"),
QString(),
QString(),
QList<Setting>(),
QString(),
QString(),
0));
initial.append(
Encoder(QObject::tr("FLAC"),
QObject::tr("<a href=http://en.wikipedia.org/wiki/Free_Lossless_Audio_Codec>Free "
"Lossless Audio Codec</a> (FLAC) is an open and royalty-free codec for "
"lossless compression of digital music.<br>If you wish to store your music "
"without compromising on audio quality, FLAC is an excellent choice."),
QObject::tr("The <a href=http://flac.sourceforge.net/documentation_tools_flac.html>"
"compression level</a> is an integer value between 0 and 8 that represents "
"the tradeoff between file size and compression speed while encoding with <b>FLAC</b>.<br/>"
"Setting the compression level to <b>0</b> yields the shortest compression time but "
"generates a comparably big file.<br/>"
"On the other hand, a compression level of <b>8</b> makes compression quite slow but "
"produces the smallest file.<br/>"
"Note that since FLAC is by definition a lossless codec, the audio quality "
"of the output is exactly the same regardless of the compression level.<br/>"
"Also, levels above <b>5</b> dramatically increase compression time but create an only "
"slightly smaller file, and are not recommended."),
QLatin1String("flac"),
command,
QLatin1String("flac"),
QLatin1String("-compression_level"),
QObject::tr("Compression level"),
QList<Setting>() << Setting(QString::number(0), 0)
<< Setting(QString::number(1), 1)
<< Setting(QString::number(2), 2)
<< Setting(QString::number(3), 3)
<< Setting(QString::number(4), 4)
<< Setting(QString::number(5), 5)
<< Setting(QString::number(6), 6)
<< Setting(QString::number(7), 7)
<< Setting(QString::number(8), 8),
QObject::tr("Faster compression"),
QObject::tr("Smaller file"),
5));
initial.append(lame);
initial.append(ogg);
initial.append(opus);
initial.append(
Encoder(QObject::tr("Windows Media Audio"),
QObject::tr("<a href=http://en.wikipedia.org/wiki/Windows_Media_Audio>Windows Media "
"Audio</a> (WMA) is a proprietary codec developed by Microsoft for lossy "
"audio compression.<br>Recommended only for portable music players that "
"do not support Ogg Vorbis."),
QObject::tr("The bitrate is a measure of the quantity of data used to represent a "
"second of the audio track.<br>Due to the limitations of the proprietary <b>WMA</b> "
"format and the difficulty of reverse-engineering a proprietary encoder, the "
"WMA encoder used by Cantata sets a <a href=http://en.wikipedia.org/wiki/"
"Windows_Media_Audio#Windows_Media_Audio>constant bitrate (CBR)</a> setting.<br>"
"For this reason, the bitrate measure in this slider is a pretty accurate estimate "
"of the bitrate of the encoded track.<br>"
"<b>136kb/s</b> is a good choice for music listening on a portable player.<br/>"
"Anything below <b>112kb/s</b> might be unsatisfactory for music and anything above "
"<b>182kb/s</b> is probably overkill."),
QLatin1String("wma"),
command,
QLatin1String("wmav2"),
QLatin1String("-ab"),
QObject::tr("Bitrate"),
QList<Setting>() << Setting(QObject::tr(cbr).arg(64), 65)
<< Setting(QObject::tr(cbr).arg(80), 75)
<< Setting(QObject::tr(cbr).arg(96), 88)
<< Setting(QObject::tr(cbr).arg(112), 106)
<< Setting(QObject::tr(cbr).arg(136), 133)
<< Setting(QObject::tr(cbr).arg(182), 180)
<< Setting(QObject::tr(cbr).arg(275), 271)
<< Setting(QObject::tr(cbr).arg(550), 545),
QObject::tr("Smaller file"),
QObject::tr("Better sound quality"),
4,
1000));
QProcess proc;
proc.start(command, QStringList() << "-codecs");
if (proc.waitForStarted()) {
proc.waitForFinished();
}
if (0 != proc.exitCode()) {
return;
}
QString output = proc.readAllStandardOutput();
if (output.simplified().isEmpty()) {
return;
}
QStringList lines = output.split('\n', CANTATA_SKIP_EMPTY);
for (const QString& line : lines) {
static const QRegularExpression lineRegex("[\\. D]EA");
int pos = line.indexOf(lineRegex);
if (0 == pos || 1 == pos) {
QList<Encoder>::Iterator it(initial.begin());
QList<Encoder>::Iterator end(initial.end());
for (; it != end; ++it) {
if (line.contains((*it).codec)) {
installedEncoders.append((*it));
initial.erase(it);
break;
}
}
if (initial.isEmpty()) {
break;
}
}
}
}
insertCodec(QLatin1String("faac"), QLatin1String("-q"), QLatin1String("-o"), aacFaac);
insertCodec(QLatin1String("lame"), QLatin1String("-V"), QString(), lame);
insertCodec(QLatin1String("oggenc"), QLatin1String("-q"), QLatin1String("-o"), ogg);
insertCodec(QLatin1String("opusenc"), QLatin1String("--bitrate"), QString(), opus);
std::sort(installedEncoders.begin(), installedEncoders.end());
}
}
bool Encoder::operator<(const Encoder& o) const
{
return name.compare(o.name) < 0;
}
QString Encoder::changeExtension(const QString& file)
{
return Utils::changeExtension(file, extension);
}
bool Encoder::isDifferent(const QString& file)
{
return file.toLower() != changeExtension(file).toLower();
}
QStringList Encoder::params(int value, const QString& in, const QString& out) const
{
QStringList p;
if (transcoder) {
p << app << QLatin1String("-i") << in << QLatin1String("-threads") << QLatin1String("0") << QLatin1String(usingAvconv ? "-c:a" : "-acodec") << codec;
}
else {
p << app;
}
if (!param.isEmpty() && values.size() > 1) {
bool increase = values.at(0).value < values.at(1).value;
int v = values.at(defaultValueIndex).value;
for (const Setting& s : values) {
if ((increase && s.value > value) || (!increase && s.value < value)) {
break;
}
else {
v = s.value;
}
}
p << param << QString::number(v * ffmpegValueMultiplier);
}
if (transcoder) {
p << "-vn"// Ensure ffmpeg does not think embedded cover-art is a video!!!
<< "-y";// Overwrite destination
}
else {
p << in;
}
if (!outputParam.isEmpty()) {
p << outputParam;
}
p << out;
return p;
}
QList<Encoder> getAvailable()
{
init();
return installedEncoders;
}
Encoder getEncoder(const QString& codec)
{
init();
for (const Encoder& encoder : installedEncoders) {
if (encoder.codec == codec) {
return encoder;
}
}
return Encoder();
}
}// namespace Encoders
|
