C++ BeatsPointer::getBpm方法代码示例

void BpmControl::slotAdjustBeatsSlower(double v) {
    BeatsPointer pBeats = m_pBeats;
    if (v > 0 && pBeats && (pBeats->getCapabilities() & Beats::BEATSCAP_SETBPM)) {
        double new_bpm = math_max(10.0, pBeats->getBpm() - .01);
        pBeats->setBpm(new_bpm);
    }
}

void AnalyserBeats::finalise(TrackPointer tio) {
    if (m_pVamp == NULL) {
        return;
    }

    // Call End() here, because the number of total samples may have been
    // estimated incorrectly.
    bool success = m_pVamp->End();
    qDebug() << "Beat Calculation" << (success ? "complete" : "failed");

    QVector<double> beats = m_pVamp->GetInitFramesVector();
    delete m_pVamp;
    m_pVamp = NULL;

    if (beats.isEmpty()) {
        qDebug() << "Could not detect beat positions from Vamp.";
        return;
    }

    QHash<QString, QString> extraVersionInfo = getExtraVersionInfo(
        m_pluginId, m_bPreferencesFastAnalysis);
    BeatsPointer pBeats = BeatFactory::makePreferredBeats(
        tio, beats, extraVersionInfo,
        m_bPreferencesFixedTempo, m_bPreferencesOffsetCorrection,
        m_iSampleRate, m_iTotalSamples,
        m_iMinBpm, m_iMaxBpm);

    BeatsPointer pCurrentBeats = tio->getBeats();

    // If the track has no beats object then set our newly generated one
    // regardless of beat lock.
    if (!pCurrentBeats) {
        tio->setBeats(pBeats);
        return;
    }

    // If the track received the beat lock while we were analyzing it then we
    // abort setting it.
    if (tio->hasBpmLock()) {
        qDebug() << "Track was BPM-locked as we were analysing it. Aborting analysis.";
        return;
    }

    // If the user prefers to replace old beatgrids with newly generated ones or
    // the old beatgrid has 0-bpm then we replace it.
    bool zeroCurrentBpm = pCurrentBeats->getBpm() == 0.0f;
    if (m_bPreferencesReanalyzeOldBpm || zeroCurrentBpm) {
        if (zeroCurrentBpm) {
            qDebug() << "Replacing 0-BPM beatgrid with a" << pBeats->getBpm()
                     << "beatgrid.";
        }
        tio->setBeats(pBeats);
        return;
    }

    // If we got here then the user doesn't want to replace the beatgrid but
    // since the first beat is zero we'll apply the offset we just detected.
    double currentFirstBeat = pCurrentBeats->findNextBeat(0);
    double newFirstBeat = pBeats->findNextBeat(0);
    if (currentFirstBeat == 0.0 && newFirstBeat > 0) {
        pCurrentBeats->translate(newFirstBeat);
    }
}

// TODO(XXX): Get rid of the horrible duplication here between initialise and
// loadStored.
bool AnalyserBeats::initialise(TrackPointer tio, int sampleRate, int totalSamples) {
    if (totalSamples == 0) {
        return false;
    }

    bool bPreferencesBeatDetectionEnabled = static_cast<bool>(
        m_pConfig->getValueString(
            ConfigKey(BPM_CONFIG_KEY, BPM_DETECTION_ENABLED)).toInt());
    if (!bPreferencesBeatDetectionEnabled) {
        qDebug() << "Beat calculation is deactivated";
        return false;
    }

    bool bpmLock = tio->hasBpmLock();
    if (bpmLock) {
        qDebug() << "Track is BpmLocked: Beat calculation will not start";
        return false;
    }

    bool allow_above = static_cast<bool>(m_pConfig->getValueString(
        ConfigKey(BPM_CONFIG_KEY, BPM_ABOVE_RANGE_ENABLED)).toInt());
    if (allow_above) {
        m_iMinBpm = 0;
        m_iMaxBpm = 9999;
    } else {
        m_iMinBpm = m_pConfig->getValueString(ConfigKey(BPM_CONFIG_KEY, BPM_RANGE_START)).toInt();
        m_iMaxBpm = m_pConfig->getValueString(ConfigKey(BPM_CONFIG_KEY, BPM_RANGE_END)).toInt();
    }

    m_bPreferencesFixedTempo = static_cast<bool>(
        m_pConfig->getValueString(
            ConfigKey(BPM_CONFIG_KEY, BPM_FIXED_TEMPO_ASSUMPTION)).toInt());
    m_bPreferencesOffsetCorrection = static_cast<bool>(
        m_pConfig->getValueString(
            ConfigKey(BPM_CONFIG_KEY, BPM_FIXED_TEMPO_OFFSET_CORRECTION)).toInt());
    m_bPreferencesReanalyzeOldBpm = static_cast<bool>(
        m_pConfig->getValueString(
            ConfigKey(BPM_CONFIG_KEY, BPM_REANALYZE_WHEN_SETTINGS_CHANGE)).toInt());
    m_bPreferencesFastAnalysis = static_cast<bool>(
        m_pConfig->getValueString(
            ConfigKey(BPM_CONFIG_KEY, BPM_FAST_ANALYSIS_ENABLED)).toInt());


    QString library = m_pConfig->getValueString(
        ConfigKey(VAMP_CONFIG_KEY, VAMP_ANALYSER_BEAT_LIBRARY));
    QString pluginID = m_pConfig->getValueString(
        ConfigKey(VAMP_CONFIG_KEY, VAMP_ANALYSER_BEAT_PLUGIN_ID));

    m_pluginId = pluginID;
    m_iSampleRate = sampleRate;
    m_iTotalSamples = totalSamples;

    // If the track already has a Beats object then we need to decide whether to
    // analyze this track or not.
    bool bShouldAnalyze = false;
    BeatsPointer pBeats = tio->getBeats();
    if (pBeats) {
        QString version = pBeats->getVersion();
        QString subVersion = pBeats->getSubVersion();

        QHash<QString, QString> extraVersionInfo = getExtraVersionInfo(
            m_pluginId, m_bPreferencesFastAnalysis);
        QString newVersion = BeatFactory::getPreferredVersion(
                m_bPreferencesFixedTempo);
        QString newSubVersion = BeatFactory::getPreferredSubVersion(
                m_bPreferencesFixedTempo, m_bPreferencesOffsetCorrection,
                m_iMinBpm, m_iMaxBpm, extraVersionInfo);

        if (version == newVersion && subVersion == newSubVersion) {
            // If the version and settings have not changed then if the world is
            // sane, re-analyzing will do nothing.
            bShouldAnalyze = false;
            qDebug() << "Beat sub-version has not changed since previous analysis so not analyzing.";
        } else if (m_bPreferencesReanalyzeOldBpm) {
            bShouldAnalyze = true;
        } else if (pBeats->getBpm() == 0.0) {
            bShouldAnalyze = true;
            qDebug() << "BPM is 0 for track so re-analyzing despite preference settings.";
        } else if (pBeats->findNextBeat(0) <= 0.0) {
            bShouldAnalyze = true;
            qDebug() << "First beat is 0 for grid so analyzing track to find first beat.";
        } else {
            bShouldAnalyze = false;
            qDebug() << "Beat calculation skips analyzing because the track has"
                     << "a BPM computed by a previous Mixxx version and user"
                     << "preferences indicate we should not change it.";
        }
    } else {
        // No valid keys stored so we want to analyze this track.
        bShouldAnalyze = true;
    }

    if (bShouldAnalyze) {
        m_pVamp = new VampAnalyser(m_pConfig);
        bShouldAnalyze = m_pVamp->Init(library, pluginID, m_iSampleRate, totalSamples,
                                       m_bPreferencesFastAnalysis);
        if (!bShouldAnalyze) {
            delete m_pVamp;
//.........这里部分代码省略.........

// TODO(XXX): Get rid of the horrible duplication here between initialise and
// loadStored.
bool AnalyserBeats::loadStored(TrackPointer tio) const {
    int iMinBpm;
    int iMaxBpm;

    bool allow_above = static_cast<bool>(m_pConfig->getValueString(
        ConfigKey(BPM_CONFIG_KEY, BPM_ABOVE_RANGE_ENABLED)).toInt());
    if (allow_above) {
        iMinBpm = 0;
        iMaxBpm = 9999;
    } else {
        iMinBpm = m_pConfig->getValueString(ConfigKey(BPM_CONFIG_KEY, BPM_RANGE_START)).toInt();
        iMaxBpm = m_pConfig->getValueString(ConfigKey(BPM_CONFIG_KEY, BPM_RANGE_END)).toInt();
    }

    bool bPreferencesFixedTempo = static_cast<bool>(
        m_pConfig->getValueString(
            ConfigKey(BPM_CONFIG_KEY, BPM_FIXED_TEMPO_ASSUMPTION)).toInt());
    bool bPreferencesOffsetCorrection = static_cast<bool>(
        m_pConfig->getValueString(
            ConfigKey(BPM_CONFIG_KEY, BPM_FIXED_TEMPO_OFFSET_CORRECTION)).toInt());
    bool bPreferencesReanalyzeOldBpm = static_cast<bool>(
        m_pConfig->getValueString(
            ConfigKey(BPM_CONFIG_KEY, BPM_REANALYZE_WHEN_SETTINGS_CHANGE)).toInt());
    bool bPreferencesFastAnalysis = static_cast<bool>(
        m_pConfig->getValueString(
            ConfigKey(BPM_CONFIG_KEY, BPM_FAST_ANALYSIS_ENABLED)).toInt());

    bool bpmLock = tio->hasBpmLock();
    if (bpmLock) {
        qDebug() << "Track is BpmLocked: Beat calculation will not start";
        return true;
    }

    QString library = m_pConfig->getValueString(
        ConfigKey(VAMP_CONFIG_KEY, VAMP_ANALYSER_BEAT_LIBRARY));
    QString pluginID = m_pConfig->getValueString(
        ConfigKey(VAMP_CONFIG_KEY, VAMP_ANALYSER_BEAT_PLUGIN_ID));

    // At first start config for QM and Vamp does not exist --> set default
    // TODO(XXX): This is no longer present in initialise. Remove?
    if (library.isEmpty() || library.isNull())
        library = "libmixxxminimal";
    if (pluginID.isEmpty() || pluginID.isNull())
        pluginID="qm-tempotracker:0";

    // If the track already has a Beats object then we need to decide whether to
    // analyze this track or not.
    BeatsPointer pBeats = tio->getBeats();
    if (pBeats) {
        QString version = pBeats->getVersion();
        QString subVersion = pBeats->getSubVersion();

        QHash<QString, QString> extraVersionInfo = getExtraVersionInfo(
            pluginID, bPreferencesFastAnalysis);
        QString newVersion = BeatFactory::getPreferredVersion(
            bPreferencesOffsetCorrection);
        QString newSubVersion = BeatFactory::getPreferredSubVersion(
            bPreferencesFixedTempo, bPreferencesOffsetCorrection,
            iMinBpm, iMaxBpm, extraVersionInfo);

        if (version == newVersion && subVersion == newSubVersion) {
            // If the version and settings have not changed then if the world is
            // sane, re-analyzing will do nothing.
            qDebug() << "Beat sub-version has not changed since previous analysis so not analyzing.";
            return true;
        } else if (bPreferencesReanalyzeOldBpm) {
            return false;
        } else if (pBeats->getBpm() == 0.0) {
            qDebug() << "BPM is 0 for track so re-analyzing despite preference settings.";
            return false;
        } else if (pBeats->findNextBeat(0) <= 0.0) {
            qDebug() << "First beat is 0 for grid so analyzing track to find first beat.";
            return false;
        } else {
            qDebug() << "Beat calculation skips analyzing because the track has"
                     << "a BPM computed by a previous Mixxx version and user"
                     << "preferences indicate we should not change it.";
            return true;
        }
    } else {
        // If we got here, we want to analyze this track.
        return false;
    }
}