QTextTospeech can't found engines

[._Miro_.]

Hello, I work with version QT 5.15.2 on a raspberry pi4.
My goal is to develop software capable of doing TTS (text to speech).
The problem I have is that the availabeEngines() method always returns only one engine namely speechd.
I saw on the blog: https://www.qt.io/blog/qt-speech-coming-to-qt-6.4 that for Linux devices, flite in version 2.3 was also supported.
So I installed this version:

texttospeech git:(feature/multi-langs) ✗ flite --version
  Carnegie Mellon University, Copyright (c) 1999-2016, all rights reserved
  version: flite-2.3-current Mar 2022 (http://cmuflite.org)

but when I run my application I always only have speechd. here is my code and the output I have:

#include <QCoreApplication>
#include <iostream>
#include <QTextToSpeech>
int main(int argc, char *argv[])
{
   QCoreApplication a(argc, argv);
   for(auto const& v : QTextToSpeech::availableEngines()){
       std::cout << "engine:"<<v.toStdString() << std::endl;
   }
    return a.exec();
}

give me

engine:speechd

Why is flite not found ?
Is it a bug in the class on. version 5.15.2 ?

[._Miro_.]

@jsulm I finally found my mistake, I'm missing the install

qtspeech5-flite-plugin

Thank you

[jsulm]

@_Miro_ Take a look at https://doc.qt.io/qt-6/qttexttospeech-engines.html "Flite" and check whether you have Flite libs in one of the folders mentioned there.

[._Miro_.]

@jsulm If I do the find command:

sudo find / -name "flite" -type d

I have this output:

/usr/share/doc/flite
/usr/local/include/flite
/usr/include/flite

[jsulm]

@_Miro_ You need to search for flite library files...

[._Miro_.]

@jsulm Something like :

/.
/usr
/usr/lib
/usr/lib/aarch64-linux-gnu
/usr/lib/aarch64-linux-gnu/libflite.so.2.2
/usr/lib/aarch64-linux-gnu/libflite_cmu_grapheme_lang.so.2.2
/usr/lib/aarch64-linux-gnu/libflite_cmu_grapheme_lex.so.2.2
/usr/lib/aarch64-linux-gnu/libflite_cmu_indic_lang.so.2.2
/usr/lib/aarch64-linux-gnu/libflite_cmu_indic_lex.so.2.2
/usr/lib/aarch64-linux-gnu/libflite_cmu_time_awb.so.2.2
/usr/lib/aarch64-linux-gnu/libflite_cmu_us_awb.so.2.2
/usr/lib/aarch64-linux-gnu/libflite_cmu_us_kal.so.2.2
/usr/lib/aarch64-linux-gnu/libflite_cmu_us_kal16.so.2.2
/usr/lib/aarch64-linux-gnu/libflite_cmu_us_rms.so.2.2
/usr/lib/aarch64-linux-gnu/libflite_cmu_us_slt.so.2.2
/usr/lib/aarch64-linux-gnu/libflite_cmulex.so.2.2
/usr/lib/aarch64-linux-gnu/libflite_usenglish.so.2.2
/usr/share
/usr/share/doc
/usr/share/doc/libflite1
/usr/share/doc/libflite1/changelog.Debian.gz
/usr/share/doc/libflite1/copyright
/usr/share/lintian
/usr/share/lintian/overrides
/usr/share/lintian/overrides/libflite1
/usr/lib/aarch64-linux-gnu/libflite.so.1
/usr/lib/aarch64-linux-gnu/libflite_cmu_grapheme_lang.so.1
/usr/lib/aarch64-linux-gnu/libflite_cmu_grapheme_lex.so.1
/usr/lib/aarch64-linux-gnu/libflite_cmu_indic_lang.so.1
/usr/lib/aarch64-linux-gnu/libflite_cmu_indic_lex.so.1
/usr/lib/aarch64-linux-gnu/libflite_cmu_time_awb.so.1
/usr/lib/aarch64-linux-gnu/libflite_cmu_us_awb.so.1
/usr/lib/aarch64-linux-gnu/libflite_cmu_us_kal.so.1
/usr/lib/aarch64-linux-gnu/libflite_cmu_us_kal16.so.1
/usr/lib/aarch64-linux-gnu/libflite_cmu_us_rms.so.1
/usr/lib/aarch64-linux-gnu/libflite_cmu_us_slt.so.1
/usr/lib/aarch64-linux-gnu/libflite_cmulex.so.1
/usr/lib/aarch64-linux-gnu/libflite_usenglish.so.1

and

 export LD_LIBRARY_PATH=/usr/lib/aarch64-linux-gnu:$LD_LIBRARY_PATH ?

Because, I have the same thing

[jsulm]

@_Miro_ said in QTextTospeech can't found engines:

export LD_LIBRARY_PATH=/usr/lib/aarch64-linux-gnu:$LD_LIBRARY_PATH ?

This is not needed for standard locations.
You can also check what happens when plug-ins are loaded. See https://doc.qt.io/qt-6/debug.html QT_DEBUG_PLUGINS

[._Miro_.]

@jsulm When I load the plugin, only speechd is found in the keys

➜   export QT_DEBUG_PLUGINS=1

➜   ./speech
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/aarch64-linux-gnu/qt5/plugins/texttospeech" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/aarch64-linux-gnu/qt5/plugins/texttospeech/libqtexttospeech_speechd.so"
Found metadata in lib /usr/lib/aarch64-linux-gnu/qt5/plugins/texttospeech/libqtexttospeech_speechd.so, metadata=
{
    "IID": "org.qt-project.qt.speech.tts.plugin/5.0",
    "MetaData": {
        "Features": [
        ],
        "Keys": [
            "speechd"
        ],
        "Provider": "speechd",
        "Version": 100
    },
    "archreq": 0,
    "className": "QTextToSpeechPluginSpeechd",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("speechd")
QFactoryLoader::QFactoryLoader() checking directory path "/home/pi/Desktop/texttospeech/texttospeech" ...
engine:speechd

[jsulm]

@_Miro_ said in QTextTospeech can't found engines:

/usr/lib/aarch64-linux-gnu/qt5/plugins/texttospeech

I guess the texttospeech plug-in was built without Flite support?

[._Miro_.]

@jsulm I don't understand: <<. I assume the texttospeech plugin was built without Flite support? >>

Actually, I can't load the engine for example:

QTextToSpeech *tts = new QTextToSpeech("flite");

return -> Text-to-speech plug-in "flite" is not supported.

[jsulm]

@_Miro_ You have /usr/lib/aarch64-linux-gnu/qt5/plugins/texttospeech/libqtexttospeech_speechd.so but no /usr/lib/aarch64-linux-gnu/qt5/plugins/texttospeech/libqtexttospeech_flite.so (or whatever the exact lib name is for Flite).

[Bonnie]

There seems no flite support according to the doc of 5.15 https://doc.qt.io/qt-5/qtspeech-index.html

The module depends on Speech Dispatcher (libspeechd) on the Linux platform.

[._Miro_.]

@jsulm I finally found my mistake, I'm missing the install

qtspeech5-flite-plugin

Thank you