kdelibs/kutils/kspeech/kspeech.cpp

/*  This file is part of the KDE libraries
    Copyright (C) 2022 Ivailo Monev <xakepa10@gmail.com>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License version 2, as published by the Free Software Foundation.

    This library 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#include "kspeech.h"

#include <QCoreApplication>
#include <kdebug.h>

#if defined(HAVE_SPEECHD)
#  include <speech-dispatcher/libspeechd.h>
#endif

static KSpeechPrivate* s_kspeechprivate = nullptr;

// NOTE: the callback function is not called in the same thread as the object that opens the
// connection
class KSpeechPrivate : public QObject
{
    friend class KSpeech;
    Q_OBJECT
public:
    KSpeechPrivate(QObject *parent);
    ~KSpeechPrivate();

#if defined(HAVE_SPEECHD)
    static void speechCallback(size_t msg_id, size_t client_id, SPDNotificationType state);
#endif

Q_SIGNALS:
    void signalJobStateChanged(int jobNum, int state);

private:
#if defined(HAVE_SPEECHD)
    SPDConnection* m_speechd;
#endif
    QByteArray m_speechid;
};

KSpeechPrivate::KSpeechPrivate(QObject *parent)
    : QObject(parent)
#if defined(HAVE_SPEECHD)
    , m_speechd(nullptr)
#endif
{
    if (Q_UNLIKELY(s_kspeechprivate)) {
        kWarning() << "Multiple KSpeech instances are not supported";
    }

    s_kspeechprivate = this;
    m_speechid = QCoreApplication::applicationName().toLocal8Bit();
}

KSpeechPrivate::~KSpeechPrivate()
{
    s_kspeechprivate = nullptr;
}

#if defined(HAVE_SPEECHD)
void KSpeechPrivate::speechCallback(size_t msg_id, size_t client_id, SPDNotificationType state)
{
    Q_UNUSED(client_id);
    // qDebug() << Q_FUNC_INFO << msg_id << client_id << state;
    if (Q_UNLIKELY(!s_kspeechprivate)) {
        kWarning() << "Null kspeech private pointer";
        return;
    }

    const int jobNum = msg_id;
    switch (state) {
        case SPD_EVENT_BEGIN: {
            emit s_kspeechprivate->signalJobStateChanged(jobNum, KSpeech::JobStarted);
            break;
        }
        case SPD_EVENT_END: {
            emit s_kspeechprivate->signalJobStateChanged(jobNum, KSpeech::JobFinished);
            break;
        }
        case SPD_EVENT_CANCEL: {
            emit s_kspeechprivate->signalJobStateChanged(jobNum, KSpeech::JobCanceled);
            break;
        }
        default: {
            break;
        }
    }
}
#endif // HAVE_SPEECHD


KSpeech::KSpeech(QObject* parent)
    : QObject(parent),
    d(new KSpeechPrivate(this))
{
    connect(
        d, SIGNAL(signalJobStateChanged(int,int)),
        this, SLOT(_jobStateChanged(int,int))
    );
}

KSpeech::~KSpeech()
{
    removeAllJobs();
    delete d;
}

bool KSpeech::isSupported()
{
#if defined(HAVE_SPEECHD)
    return true;
#else
    return false;
#endif
}

void KSpeech::setSpeechID(const QString &id)
{
    removeAllJobs();
    d->m_speechid = id.toUtf8();
}

int KSpeech::say(const QString &text)
{
#if defined(HAVE_SPEECHD)
    if (!d->m_speechd) {
        d->m_speechd = spd_open(d->m_speechid.constData(), "main", NULL, SPD_MODE_THREADED);
        if (Q_UNLIKELY(!d->m_speechd)) {
            kWarning() << "Could not open speech-dispatcher connection";
            return 0;
        }

        d->m_speechd->callback_begin = KSpeechPrivate::speechCallback;
        d->m_speechd->callback_end = KSpeechPrivate::speechCallback;
        d->m_speechd->callback_cancel = KSpeechPrivate::speechCallback;

        spd_set_notification_on(d->m_speechd, SPD_BEGIN);
        spd_set_notification_on(d->m_speechd, SPD_END);
        spd_set_notification_on(d->m_speechd, SPD_CANCEL);
    }

    const QByteArray textbytes = text.toUtf8();
    const int jobNum = spd_say(d->m_speechd, SPD_TEXT, textbytes.constData());
    if (jobNum < 0) {
        kWarning() << "Speech-dispatcher say failed";
        return 0;
    }

    // qDebug() << Q_FUNC_INFO << jobNum << spd_get_client_id(d->m_speechd);
    return jobNum;
#else
    kWarning() << "KSpeech is a stub";
    return 0;
#endif // HAVE_SPEECHD
}

void KSpeech::removeAllJobs()
{
#if defined(HAVE_SPEECHD)
    if (Q_UNLIKELY(!d->m_speechd)) {
        kDebug() << "Null speech-dispatcher pointer";
        return;
    }

    spd_stop(d->m_speechd);
    spd_close(d->m_speechd);
    d->m_speechd = nullptr;
#endif
}

void KSpeech::removeJob(int jobNum)
{
#if defined(HAVE_SPEECHD)
    if (Q_UNLIKELY(!d->m_speechd)) {
        kWarning() << "Null speech-dispatcher pointer";
        return;
    }

    spd_stop_uid(d->m_speechd, jobNum);
#endif
}

void KSpeech::_jobStateChanged(int jobNum, int state)
{
    emit jobStateChanged(jobNum, state);
}
#include "kspeech.moc"