bool AnalyzerBeats::initialize(TrackPointer tio, int sampleRate, int totalSamples) {
    if (totalSamples == 0) {
        return false;
    }

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

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

    bool allow_above = m_pConfig->getValue<bool>(
        ConfigKey(BPM_CONFIG_KEY, BPM_ABOVE_RANGE_ENABLED));
    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 = m_pConfig->getValue<bool>(
            ConfigKey(BPM_CONFIG_KEY, BPM_FIXED_TEMPO_ASSUMPTION));
    m_bPreferencesOffsetCorrection = m_pConfig->getValue<bool>(
            ConfigKey(BPM_CONFIG_KEY, BPM_FIXED_TEMPO_OFFSET_CORRECTION));
    m_bPreferencesReanalyzeOldBpm = m_pConfig->getValue<bool>(
            ConfigKey(BPM_CONFIG_KEY, BPM_REANALYZE_WHEN_SETTINGS_CHANGE));
    m_bPreferencesFastAnalysis = m_pConfig->getValue<bool>(
            ConfigKey(BPM_CONFIG_KEY, BPM_FAST_ANALYSIS_ENABLED));

    QString library = m_pConfig->getValueString(
            ConfigKey(VAMP_CONFIG_KEY, VAMP_ANALYZER_BEAT_LIBRARY));
    QString pluginID = m_pConfig->getValueString(
            ConfigKey(VAMP_CONFIG_KEY, VAMP_ANALYZER_BEAT_PLUGIN_ID));

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

    // if we can load a stored track don't reanalyze it
    bool bShouldAnalyze = !isDisabledOrLoadStoredSuccess(tio);

    if (bShouldAnalyze) {
        m_pVamp = new VampAnalyzer();
        bShouldAnalyze = m_pVamp->Init(library, pluginID, m_iSampleRate, totalSamples,
                                       m_bPreferencesFastAnalysis);
        if (!bShouldAnalyze) {
            delete m_pVamp;
            m_pVamp = NULL;
        }
    }

    if (bShouldAnalyze) {
        qDebug() << "Beat calculation started with plugin" << pluginID;
    } else {
        qDebug() << "Beat calculation will not start";
    }

    return bShouldAnalyze;
}

void WaveformRendererHSV::draw(QPainter* painter,
                                          QPaintEvent* /*event*/) {
    const TrackPointer trackInfo = m_waveformRenderer->getTrackInfo();
    if (!trackInfo) {
        return;
    }

    const Waveform* waveform = trackInfo->getWaveform();
    if (waveform == NULL) {
        return;
    }

    const int dataSize = waveform->getDataSize();
    if (dataSize <= 1) {
        return;
    }

    const WaveformData* data = waveform->data();
    if (data == NULL) {
        return;
    }

    painter->save();
    painter->setRenderHints(QPainter::Antialiasing, false);
    painter->setRenderHints(QPainter::HighQualityAntialiasing, false);
    painter->setRenderHints(QPainter::SmoothPixmapTransform, false);
    painter->setWorldMatrixEnabled(false);
    painter->resetTransform();

    const double firstVisualIndex = m_waveformRenderer->getFirstDisplayedPosition() * dataSize;
    const double lastVisualIndex = m_waveformRenderer->getLastDisplayedPosition() * dataSize;

    const double offset = firstVisualIndex;

    // Represents the # of waveform data points per horizontal pixel.
    const double gain = (lastVisualIndex - firstVisualIndex) /
            (double)m_waveformRenderer->getWidth();

    float allGain(1.0);
    getGains(&allGain, NULL, NULL, NULL);

    // Save HSV of waveform color. NOTE(rryan): On ARM, qreal is float so it's
    // important we use qreal here and not double or float or else we will get
    // build failures on ARM.
    qreal h, s, v;

    // Get base color of waveform in the HSV format (s and v isn't use)
    m_pColors->getLowColor().getHsvF(&h, &s, &v);

    QColor color;
    float lo, hi, total;

    const float halfHeight = (float)m_waveformRenderer->getHeight()/2.0;

    const float heightFactor = allGain*halfHeight/255.0;

    //draw reference line
    painter->setPen(m_pColors->getAxesColor());
    painter->drawLine(0,halfHeight,m_waveformRenderer->getWidth(),halfHeight);

    for (int x = 0; x < m_waveformRenderer->getWidth(); ++x) {
        // Width of the x position in visual indices.
        const double xSampleWidth = gain * x;

        // Effective visual index of x
        const double xVisualSampleIndex = xSampleWidth + offset;

        // Our current pixel (x) corresponds to a number of visual samples
        // (visualSamplerPerPixel) in our waveform object. We take the max of
        // all the data points on either side of xVisualSampleIndex within a
        // window of 'maxSamplingRange' visual samples to measure the maximum
        // data point contained by this pixel.
        double maxSamplingRange = gain / 2.0;

        // Since xVisualSampleIndex is in visual-samples (e.g. R,L,R,L) we want
        // to check +/- maxSamplingRange frames, not samples. To do this, divide
        // xVisualSampleIndex by 2. Since frames indices are integers, we round
        // to the nearest integer by adding 0.5 before casting to int.
        int visualFrameStart = int(xVisualSampleIndex / 2.0 - maxSamplingRange + 0.5);
        int visualFrameStop = int(xVisualSampleIndex / 2.0 + maxSamplingRange + 0.5);
        const int lastVisualFrame = dataSize / 2 - 1;

        // We now know that some subset of [visualFrameStart, visualFrameStop]
        // lies within the valid range of visual frames. Clamp
        // visualFrameStart/Stop to within [0, lastVisualFrame].
        visualFrameStart = math_clamp(visualFrameStart, 0, lastVisualFrame);
        visualFrameStop = math_clamp(visualFrameStop, 0, lastVisualFrame);

        int visualIndexStart = visualFrameStart * 2;
        int visualIndexStop = visualFrameStop * 2;

        int maxLow[2] = {0, 0};
        int maxHigh[2] = {0, 0};
        int maxMid[2] = {0, 0};
        int maxAll[2] = {0, 0};

        for (int i = visualIndexStart;
             i >= 0 && i + 1 < dataSize && i + 1 <= visualIndexStop; i += 2) {
            const WaveformData& waveformData = *(data + i);
            const WaveformData& waveformDataNext = *(data + i + 1);
//.........这里部分代码省略.........

bool AnalyzerBeats::isDisabledOrLoadStoredSuccess(TrackPointer tio) const {
    int iMinBpm;
    int iMaxBpm;

    bool allow_above = m_pConfig->getValue<bool>(
        ConfigKey(BPM_CONFIG_KEY, BPM_ABOVE_RANGE_ENABLED));
    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 bpmLock = tio->isBpmLocked();
    if (bpmLock) {
        qDebug() << "Track is BpmLocked: Beat calculation will not start";
        return true;
    }

    QString library = m_pConfig->getValueString(
        ConfigKey(VAMP_CONFIG_KEY, VAMP_ANALYZER_BEAT_LIBRARY));
    QString pluginID = m_pConfig->getValueString(
        ConfigKey(VAMP_CONFIG_KEY, VAMP_ANALYZER_BEAT_PLUGIN_ID));

    // At first start config for QM and Vamp does not exist --> set default
    // TODO(XXX): This is no longer present in initialize. 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, m_bPreferencesFastAnalysis);
        QString newVersion = BeatFactory::getPreferredVersion(
            m_bPreferencesOffsetCorrection);
        QString newSubVersion = BeatFactory::getPreferredSubVersion(
            m_bPreferencesFixedTempo, m_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.
            return true;
        } else if (m_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;
    }
}

void AnalyzerBeats::finalize(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->isBpmLocked()) {
        qDebug() << "Track was BPM-locked as we were analyzing 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() == 0.0;
    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);
    }
}

void GLWaveformRendererRGB::draw(QPainter* painter, QPaintEvent* /*event*/) {
    TrackPointer pTrack = m_waveformRenderer->getTrackInfo();
    if (!pTrack) {
        return;
    }

    ConstWaveformPointer waveform = pTrack->getWaveform();
    if (waveform.isNull()) {
        return;
    }

    const int dataSize = waveform->getDataSize();
    if (dataSize <= 1) {
        return;
    }

    const WaveformData* data = waveform->data();
    if (data == NULL) {
        return;
    }

    double firstVisualIndex = m_waveformRenderer->getFirstDisplayedPosition() * dataSize;
    double lastVisualIndex = m_waveformRenderer->getLastDisplayedPosition() * dataSize;

    const int firstIndex = int(firstVisualIndex + 0.5);
    firstVisualIndex = firstIndex - firstIndex % 2;

    const int lastIndex = int(lastVisualIndex + 0.5);
    lastVisualIndex = lastIndex + lastIndex % 2;

    // Reset device for native painting
    painter->beginNativePainting();

    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    // Per-band gain from the EQ knobs.
    float allGain(1.0), lowGain(1.0), midGain(1.0), highGain(1.0);
    getGains(&allGain, &lowGain, &midGain, &highGain);

    const float kHeightScaleFactor = 255.0 / sqrtf(255 * 255 * 3);

#ifndef __OPENGLES__

    if (m_alignment == Qt::AlignCenter) {
        glMatrixMode(GL_PROJECTION);
        glPushMatrix();
        glLoadIdentity();
        glOrtho(firstVisualIndex, lastVisualIndex, -255.0, 255.0, -10.0, 10.0);

        glMatrixMode(GL_MODELVIEW);
        glPushMatrix();
        glLoadIdentity();

        glScalef(1.0f, allGain, 1.0f);

        glLineWidth(1.2);
        glDisable(GL_LINE_SMOOTH);

        // Draw reference line
        glBegin(GL_LINES); {
            glColor4f(m_axesColor_r, m_axesColor_g, m_axesColor_b, m_axesColor_a);
            glVertex2f(firstVisualIndex, 0);
            glVertex2f(lastVisualIndex,  0);
        }
        glEnd();

        glLineWidth(2.0);
        glEnable(GL_LINE_SMOOTH);

        glBegin(GL_LINES); {
            for (int visualIndex = firstVisualIndex;
                 visualIndex < lastVisualIndex;
                 visualIndex += 2) {

                if (visualIndex < 0) {
                    continue;
                }

                if (visualIndex > dataSize - 1) {
                    break;
                }

                float left_low    = lowGain  * (float) data[visualIndex].filtered.low;
                float left_mid    = midGain  * (float) data[visualIndex].filtered.mid;
                float left_high   = highGain * (float) data[visualIndex].filtered.high;
                float left_all    = sqrtf(left_low * left_low + left_mid * left_mid + left_high * left_high) * kHeightScaleFactor;
                float left_red    = left_low  * m_rgbLowColor_r + left_mid  * m_rgbMidColor_r + left_high  * m_rgbHighColor_r;
                float left_green  = left_low  * m_rgbLowColor_g + left_mid  * m_rgbMidColor_g + left_high  * m_rgbHighColor_g;
                float left_blue   = left_low  * m_rgbLowColor_b + left_mid  * m_rgbMidColor_b + left_high  * m_rgbHighColor_b;
                float left_max    = math_max3(left_red, left_green, left_blue);
                if (left_max > 0.0f) {  // Prevent division by zero
                    glColor4f(left_red / left_max, left_green / left_max, left_blue / left_max, 0.8f);
                    glVertex2f(visualIndex, 0.0f);
                    glVertex2f(visualIndex, left_all);
                }

                float right_low   = lowGain  * (float) data[visualIndex+1].filtered.low;
                float right_mid   = midGain  * (float) data[visualIndex+1].filtered.mid;
                float right_high  = highGain * (float) data[visualIndex+1].filtered.high;
//.........这里部分代码省略.........

void QtWaveformRendererSimpleSignal::draw(QPainter* painter, QPaintEvent* /*event*/){

    TrackPointer pTrack = m_waveformRenderer->getTrackInfo();
    if (!pTrack) {
        return;
    }

    const Waveform* waveform = pTrack->getWaveform();
    if (waveform == NULL) {
        return;
    }

    const int dataSize = waveform->getDataSize();
    if (dataSize <= 1) {
        return;
    }

    const WaveformData* data = waveform->data();
    if (data == NULL) {
        return;
    }

    painter->save();

    painter->setRenderHint(QPainter::Antialiasing);
    painter->resetTransform();

    WaveformWidgetFactory* factory = WaveformWidgetFactory::instance();
    const double  visualGain = factory->getVisualGain(WaveformWidgetFactory::All);

    double heightGain = visualGain*m_waveformRenderer->getGain()*(double)m_waveformRenderer->getHeight()/255.0;
    if (m_alignment == Qt::AlignTop) {
        painter->translate(0.0, 0.0);
        painter->scale(1.0, heightGain);
    } else if (m_alignment == Qt::AlignBottom) {
        painter->translate(0.0, m_waveformRenderer->getHeight());
        painter->scale(1.0, heightGain);
    } else {
        painter->translate(0.0, m_waveformRenderer->getHeight()/2.0);
        painter->scale(1.0, 0.5*heightGain);
    }

    //draw reference line
    if (m_alignment == Qt::AlignCenter) {
        painter->setPen(m_axesColor);
        painter->drawLine(0,0,m_waveformRenderer->getWidth(),0);
    }

    const double firstVisualIndex = m_waveformRenderer->getFirstDisplayedPosition() * dataSize;
    const double lastVisualIndex = m_waveformRenderer->getLastDisplayedPosition() * dataSize;
    m_polygon.clear();
    m_polygon.reserve(2 * m_waveformRenderer->getWidth() + 2);
    m_polygon.append(QPointF(0.0, 0.0));

    const double offset = firstVisualIndex;

    // Represents the # of waveform data points per horizontal pixel.
    const double gain = (lastVisualIndex - firstVisualIndex) /
            (double)m_waveformRenderer->getWidth();

    //NOTE(vrince) Please help me find a better name for "channelSeparation"
    //this variable stand for merged channel ... 1 = merged & 2 = separated
    int channelSeparation = 2;
    if (m_alignment != Qt::AlignCenter)
        channelSeparation = 1;

    for (int channel = 0; channel < channelSeparation; ++channel) {
        int startPixel = 0;
        int endPixel = m_waveformRenderer->getWidth() - 1;
        int delta = 1;
        double direction = 1.0;

        //Reverse display for merged bottom channel
        if (m_alignment == Qt::AlignBottom)
            direction = -1.0;

        if (channel == 1) {
            startPixel = m_waveformRenderer->getWidth() - 1;
            endPixel = 0;
            delta = -1;
            direction = -1.0;

            // After preparing the first channel, insert the pivot point.
            m_polygon.append(QPointF(m_waveformRenderer->getWidth(), 0.0));
        }

        for (int x = startPixel;
                (startPixel < endPixel) ? (x <= endPixel) : (x >= endPixel);
                x += delta) {

            // TODO(rryan) remove before 1.11 release. I'm seeing crashes
            // sometimes where the pointIndex is very very large. It hasn't come
            // back since adding locking, but I'm leaving this so that we can
            // get some info about it before crashing. (The crash usually
            // corrupts a lot of the stack).
            if (m_polygon.size() > 2 * m_waveformRenderer->getWidth() + 2) {
                qDebug() << "OUT OF CONTROL"
                         << 2 * m_waveformRenderer->getWidth() + 2
                         << dataSize
                         << channel << m_polygon.size() << x;
//.........这里部分代码省略.........

void BaseTrackPlayerImpl::slotLoadTrack(TrackPointer track, bool bPlay) {
    // Before loading the track, ensure we have access. This uses lazy
    // evaluation to make sure track isn't NULL before we dereference it.
    if (!track.isNull() && !Sandbox::askForAccess(track->getCanonicalLocation())) {
        // We don't have access.
        return;
    }

    //Disconnect the old track's signals.
    if (m_pLoadedTrack) {
        // Save the loops that are currently set in a loop cue. If no loop cue is
        // currently on the track, then create a new one.
        int loopStart = m_pLoopInPoint->get();
        int loopEnd = m_pLoopOutPoint->get();
        if (loopStart != -1 && loopEnd != -1 &&
            even(loopStart) && even(loopEnd) && loopStart <= loopEnd) {
            Cue* pLoopCue = NULL;
            QList<Cue*> cuePoints = m_pLoadedTrack->getCuePoints();
            QListIterator<Cue*> it(cuePoints);
            while (it.hasNext()) {
                Cue* pCue = it.next();
                if (pCue->getType() == Cue::LOOP) {
                    pLoopCue = pCue;
                }
            }
            if (!pLoopCue) {
                pLoopCue = m_pLoadedTrack->addCue();
                pLoopCue->setType(Cue::LOOP);
            }
            pLoopCue->setPosition(loopStart);
            pLoopCue->setLength(loopEnd - loopStart);
        }

        // WARNING: Never. Ever. call bare disconnect() on an object. Mixxx
        // relies on signals and slots to get tons of things done. Don't
        // randomly disconnect things.
        // m_pLoadedTrack->disconnect();
        disconnect(m_pLoadedTrack.data(), 0, m_pBPM, 0);
        disconnect(m_pLoadedTrack.data(), 0, this, 0);
        disconnect(m_pLoadedTrack.data(), 0, m_pKey, 0);

        m_pReplayGain->slotSet(0);

        // Causes the track's data to be saved back to the library database.
        emit(unloadingTrack(m_pLoadedTrack));
    }

    m_pLoadedTrack = track;
    if (m_pLoadedTrack) {
        // Listen for updates to the file's BPM
        connect(m_pLoadedTrack.data(), SIGNAL(bpmUpdated(double)),
                m_pBPM, SLOT(slotSet(double)));

        connect(m_pLoadedTrack.data(), SIGNAL(keyUpdated(double)),
                m_pKey, SLOT(slotSet(double)));

        // Listen for updates to the file's Replay Gain
        connect(m_pLoadedTrack.data(), SIGNAL(ReplayGainUpdated(double)),
                this, SLOT(slotSetReplayGain(double)));
    }

    //Request a new track from the reader
    emit(loadTrack(track, bPlay));
}

void BaseTrackPlayerImpl::slotFinishLoading(TrackPointer pTrackInfoObject)
{
    m_replaygainPending = false;
    // Read the tags if required
    if (!m_pLoadedTrack->getHeaderParsed()) {
        m_pLoadedTrack->parse(false);
    }

    // m_pLoadedTrack->setPlayedAndUpdatePlaycount(true); // Actually the song is loaded but not played

    // Update the BPM and duration values that are stored in ControlObjects
    m_pDuration->set(m_pLoadedTrack->getDuration());
    m_pBPM->slotSet(m_pLoadedTrack->getBpm());
    m_pKey->slotSet(m_pLoadedTrack->getKey());
    m_pReplayGain->slotSet(m_pLoadedTrack->getReplayGain());

    // Update the PlayerInfo class that is used in EngineShoutcast to replace
    // the metadata of a stream
    PlayerInfo::instance().setTrackInfo(getGroup(), m_pLoadedTrack);

    // Reset the loop points.
    m_pLoopInPoint->slotSet(-1);
    m_pLoopOutPoint->slotSet(-1);

    const QList<Cue*> trackCues = pTrackInfoObject->getCuePoints();
    QListIterator<Cue*> it(trackCues);
    while (it.hasNext()) {
        Cue* pCue = it.next();
        if (pCue->getType() == Cue::LOOP) {
            int loopStart = pCue->getPosition();
            int loopEnd = loopStart + pCue->getLength();
            if (loopStart != -1 && loopEnd != -1 && even(loopStart) && even(loopEnd)) {
                m_pLoopInPoint->slotSet(loopStart);
                m_pLoopOutPoint->slotSet(loopEnd);
                break;
            }
        }
    }
    if(m_pConfig->getValueString(ConfigKey("[Mixer Profile]", "EqAutoReset"), 0).toInt()) {
        if (m_pLowFilter != NULL) {
            m_pLowFilter->set(1.0);
        }
        if (m_pMidFilter != NULL) {
            m_pMidFilter->set(1.0);
        }
        if (m_pHighFilter != NULL) {
            m_pHighFilter->set(1.0);
        }
        if (m_pLowFilterKill != NULL) {
            m_pLowFilterKill->set(0.0);
        }
        if (m_pMidFilterKill != NULL) {
            m_pMidFilterKill->set(0.0);
        }
        if (m_pHighFilterKill != NULL) {
            m_pHighFilterKill->set(0.0);
        }
        m_pPreGain->set(1.0);
    }
    int reset = m_pConfig->getValueString(ConfigKey(
            "[Controls]", "SpeedAutoReset"),
            QString("%1").arg(RESET_PITCH)).toInt();
    switch (reset) {
      case RESET_PITCH_AND_SPEED:
        // Note: speed may affect pitch
        if (m_pSpeed != NULL) {
            m_pSpeed->set(0.0);
        }
        // Fallthrough intended
      case RESET_PITCH:
        if (m_pPitchAdjust != NULL) {
            m_pPitchAdjust->set(0.0);
        }
    }
    emit(newTrackLoaded(m_pLoadedTrack));
}

void GLWaveformRendererSimpleSignal::draw(QPainter* painter, QPaintEvent* /*event*/) {
    TrackPointer pTrack = m_waveformRenderer->getTrackInfo();
    if (!pTrack) {
        return;
    }

    ConstWaveformPointer waveform = pTrack->getWaveform();
    if (waveform.isNull()) {
        return;
    }

    const int dataSize = waveform->getDataSize();
    if (dataSize <= 1) {
        return;
    }

    const WaveformData* data = waveform->data();
    if (data == NULL) {
        return;
    }

    double firstVisualIndex = m_waveformRenderer->getFirstDisplayedPosition() * dataSize;
    double lastVisualIndex = m_waveformRenderer->getLastDisplayedPosition() * dataSize;

    const int firstIndex = int(firstVisualIndex+0.5);
    firstVisualIndex = firstIndex - firstIndex%2;

    const int lastIndex = int(lastVisualIndex+0.5);
    lastVisualIndex = lastIndex + lastIndex%2;

    // Reset device for native painting
    painter->beginNativePainting();

    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    float allGain(1.0);
    getGains(&allGain, NULL, NULL, NULL);

    float maxAll[2];

    if (m_alignment == Qt::AlignCenter) {
        glMatrixMode(GL_PROJECTION);
        glPushMatrix();
        glLoadIdentity();
        glOrtho(firstVisualIndex, lastVisualIndex, -255.0, 255.0, -10.0, 10.0);

        glMatrixMode(GL_MODELVIEW);
        glPushMatrix();
        glLoadIdentity();

        glScalef(1.f, allGain, 1.f);

        glLineWidth(1.0);
        glDisable(GL_LINE_SMOOTH);

        //draw reference line
        glBegin(GL_LINES); {
            glColor4f(m_axesColor_r, m_axesColor_g,
                      m_axesColor_b, m_axesColor_a);
            glVertex2f(firstVisualIndex,0);
            glVertex2f(lastVisualIndex,0);
        }
        glEnd();

        glLineWidth(1.1);
        glEnable(GL_LINE_SMOOTH);

        glBegin(GL_LINES); {
            for (int visualIndex = firstVisualIndex;
                 visualIndex < lastVisualIndex;
                 visualIndex += 2) {

                if (visualIndex < 0)
                    continue;

                if (visualIndex > dataSize - 1)
                    break;

                maxAll[0] = (float)data[visualIndex].filtered.all;
                maxAll[1] = (float)data[visualIndex+1].filtered.all;
                glColor4f(m_signalColor_r, m_signalColor_g, m_signalColor_b, 0.9);
                glVertex2f(visualIndex,maxAll[0]);
                glVertex2f(visualIndex,-1.f*maxAll[1]);
            }
        }
        glEnd();
    } else { //top || bottom
        glMatrixMode(GL_PROJECTION);
        glPushMatrix();
        glLoadIdentity();
        if (m_alignment == Qt::AlignBottom)
            glOrtho(firstVisualIndex, lastVisualIndex, 0.0, 255.0, -10.0, 10.0);
        else
            glOrtho(firstVisualIndex, lastVisualIndex, 255.0, 0.0, -10.0, 10.0);

        glMatrixMode(GL_MODELVIEW);
        glPushMatrix();
        glLoadIdentity();

//.........这里部分代码省略.........

void SamplerBank::slotSaveSamplerBank(double v) {
    if (v == 0.0 || m_pPlayerManager == NULL) {
        return;
    }
    QString filefilter = tr("Mixxx Sampler Banks (*.xml)");
    QString samplerBankPath = QFileDialog::getSaveFileName(
            NULL, tr("Save Sampler Bank"),
            QString(),
            tr("Mixxx Sampler Banks (*.xml)"),
            &filefilter);
    if (samplerBankPath.isNull() || samplerBankPath.isEmpty()) {
        return;
    }
    // Manually add extension due to bug in QFileDialog
    // via https://bugreports.qt-project.org/browse/QTBUG-27186
    // Can be removed after switch to Qt5
    QFileInfo fileName(samplerBankPath);
    if (fileName.suffix().isEmpty()) {
        QString ext = filefilter.section(".",1,1);
        ext.chop(1);
        samplerBankPath.append(".").append(ext);
    }

    // The user has picked a new directory via a file dialog. This means the
    // system sandboxer (if we are sandboxed) has granted us permission to this
    // folder. We don't need access to this file on a regular basis so we do not
    // register a security bookmark.

    QFile file(samplerBankPath);
    if (!file.open(QIODevice::WriteOnly)) {
        QMessageBox::warning(NULL,
                             tr("Error Saving Sampler Bank"),
                             tr("Could not write the sampler bank to '%1'.")
                             .arg(samplerBankPath));
        return;
    }

    QDomDocument doc("SamplerBank");

    QDomElement root = doc.createElement("samplerbank");
    doc.appendChild(root);

    for (unsigned int i = 0; i < m_pPlayerManager->numSamplers(); ++i) {
        Sampler* pSampler = m_pPlayerManager->getSampler(i + 1);
        if (pSampler == NULL) {
            continue;
        }
        QDomElement samplerNode = doc.createElement(QString("sampler"));

        samplerNode.setAttribute("group", pSampler->getGroup());

        TrackPointer pTrack = pSampler->getLoadedTrack();
        if (pTrack) {
            QString samplerLocation = pTrack->getLocation();
            samplerNode.setAttribute("location", samplerLocation);
        }
        root.appendChild(samplerNode);
    }

    QString docStr = doc.toString();

    file.write(docStr.toUtf8().constData());
    file.close();
}

void GLWaveformRendererRGB::draw(QPainter* painter, QPaintEvent* /*event*/) {

    TrackPointer pTrack = m_waveformRenderer->getTrackInfo();
    if (!pTrack) {
        return;
    }

    const Waveform* waveform = pTrack->getWaveform();
    if (waveform == NULL) {
        return;
    }

    const int dataSize = waveform->getDataSize();
    if (dataSize <= 1) {
        return;
    }

    const WaveformData* data = waveform->data();
    if (data == NULL) {
        return;
    }

    double firstVisualIndex = m_waveformRenderer->getFirstDisplayedPosition() * dataSize;
    double lastVisualIndex = m_waveformRenderer->getLastDisplayedPosition() * dataSize;

    const int firstIndex = int(firstVisualIndex + 0.5);
    firstVisualIndex = firstIndex - firstIndex % 2;

    const int lastIndex = int(lastVisualIndex + 0.5);
    lastVisualIndex = lastIndex + lastIndex % 2;

    // Reset device for native painting
    painter->beginNativePainting();

    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    // Per-band gain from the EQ knobs.
    float lowGain(1.0), midGain(1.0), highGain(1.0);
    if (m_pLowFilterControlObject && m_pMidFilterControlObject && m_pHighFilterControlObject) {
        lowGain = m_pLowFilterControlObject->get();
        midGain = m_pMidFilterControlObject->get();
        highGain = m_pHighFilterControlObject->get();
    }

    WaveformWidgetFactory* factory = WaveformWidgetFactory::instance();
    const double visualGain = factory->getVisualGain(::WaveformWidgetFactory::All);
    lowGain  *= factory->getVisualGain(WaveformWidgetFactory::Low);
    midGain  *= factory->getVisualGain(WaveformWidgetFactory::Mid);
    highGain *= factory->getVisualGain(WaveformWidgetFactory::High);

    if (m_alignment == Qt::AlignCenter) {
        glMatrixMode(GL_PROJECTION);
        glPushMatrix();
        glLoadIdentity();
        glOrtho(firstVisualIndex, lastVisualIndex, -255.0, 255.0, -10.0, 10.0);

        glMatrixMode(GL_MODELVIEW);
        glPushMatrix();
        glLoadIdentity();

        glScalef(1.0f, visualGain * m_waveformRenderer->getGain(), 1.0f);

        glLineWidth(1.2);
        glDisable(GL_LINE_SMOOTH);

        // Draw reference line
        glBegin(GL_LINES); {
            glColor4f(m_axesColor_r, m_axesColor_g, m_axesColor_b, m_axesColor_a);
            glVertex2f(firstVisualIndex, 0);
            glVertex2f(lastVisualIndex,  0);
        }
        glEnd();

        glLineWidth(1.2);
        glEnable(GL_LINE_SMOOTH);

        glBegin(GL_LINES); {
            for( int visualIndex = firstVisualIndex;
                 visualIndex < lastVisualIndex;
                 visualIndex += 2) {

                if( visualIndex < 0)
                    continue;

                if( visualIndex > dataSize - 1)
                    break;

                float left_low    = lowGain  * (float) data[visualIndex].filtered.low;
                float left_mid    = midGain  * (float) data[visualIndex].filtered.mid;
                float left_high   = highGain * (float) data[visualIndex].filtered.high;
                float left_all    = sqrtf(left_low * left_low + left_mid * left_mid + left_high * left_high);
                float left_red    = left_low  * m_lowColor.red()   + left_mid  * m_midColor.red()   + left_high  * m_highColor.red();
                float left_green  = left_low  * m_lowColor.green() + left_mid  * m_midColor.green() + left_high  * m_highColor.green();
                float left_blue   = left_low  * m_lowColor.blue()  + left_mid  * m_midColor.blue()  + left_high  * m_highColor.blue();
                float left_max    = MAX3(left_red, left_green, left_blue);
                if (left_max > 0.0f) {  // Prevent division by zero
                    glColor4f(left_red / left_max, left_green / left_max, left_blue / left_max, 0.8f);
                    glVertex2f(visualIndex, 0.0f);
                    glVertex2f(visualIndex, left_all);
//.........这里部分代码省略.........

void VinylControlControl::slotControlVinylSeek(double fractionalPos) {
    // Prevent NaN's from sneaking into the engine.
    if (isnan(fractionalPos)) {
        return;
    }

    // Do nothing if no track is loaded.
    TrackPointer pTrack = m_pTrack;
    if (!pTrack) {
        return;
    }

    double total_samples = getSampleOfTrack().total;
    double new_playpos = round(fractionalPos * total_samples);

    if (m_pControlVinylEnabled->get() > 0.0 && m_pControlVinylMode->get() == MIXXX_VCMODE_RELATIVE) {
        int cuemode = (int)m_pControlVinylCueing->get();

        //if in preroll, always seek
        if (new_playpos < 0) {
            seekExact(new_playpos);
            return;
        }

        switch (cuemode) {
        case MIXXX_RELATIVE_CUE_OFF:
            return; // If off, do nothing.
        case MIXXX_RELATIVE_CUE_ONECUE:
            //if onecue, just seek to the regular cue
            seekExact(pTrack->getCuePoint().getPosition());
            return;
        case MIXXX_RELATIVE_CUE_HOTCUE:
            // Continue processing in this function.
            break;
        default:
            qWarning() << "Invalid vinyl cue setting";
            return;
        }

        double shortest_distance = 0;
        int nearest_playpos = -1;

        const QList<CuePointer> cuePoints(pTrack->getCuePoints());
        QListIterator<CuePointer> it(cuePoints);
        while (it.hasNext()) {
            CuePointer pCue(it.next());
            if (pCue->getType() != Cue::CUE || pCue->getHotCue() == -1) {
                continue;
            }

            int cue_position = pCue->getPosition();
            // pick cues closest to new_playpos
            if ((nearest_playpos == -1) ||
                (fabs(new_playpos - cue_position) < shortest_distance)) {
                nearest_playpos = cue_position;
                shortest_distance = fabs(new_playpos - cue_position);
            }
        }

        if (nearest_playpos == -1) {
            if (new_playpos >= 0) {
                //never found an appropriate cue, so don't seek?
                return;
            }
            //if negative, allow a seek by falling down to the bottom
        } else {
            m_bSeekRequested = true;
            seekExact(nearest_playpos);
            m_bSeekRequested = false;
            return;
        }
    }

    // Just seek where it wanted to originally.
    m_bSeekRequested = true;
    seekExact(new_playpos);
    m_bSeekRequested = false;
}

void AnalyserQueue::run() {
    unsigned static id = 0; //the id of this thread, for debugging purposes
    QThread::currentThread()->setObjectName(QString("AnalyserQueue %1").arg(++id));

    // If there are no analyzers, don't waste time running.
    if (m_aq.size() == 0)
        return;

    m_progressInfo.current_track = TrackPointer();
    m_progressInfo.track_progress = 0;
    m_progressInfo.queue_size = 0;
    m_progressInfo.sema.release(); // Initalise with one

    while (!m_exit) {
        TrackPointer nextTrack = dequeueNextBlocking();

        // It's important to check for m_exit here in case we decided to exit
        // while blocking for a new track.
        if (m_exit)
            return;

        // If the track is NULL, try to get the next one.
        // Could happen if the track was queued but then deleted.
        // Or if dequeueNextBlocking is unblocked by exit == true
        if (!nextTrack) {
            m_qm.lock();
            m_queue_size = m_tioq.size();
            m_qm.unlock();
            if (m_queue_size == 0) {
                emit(queueEmpty()); // emit asynchrony for no deadlock
            }
            continue;
        }

        Trace trace("AnalyserQueue analyzing track");

        // Get the audio
        SoundSourceProxy soundSourceProxy(nextTrack);
        Mixxx::SoundSourcePointer pSoundSource(soundSourceProxy.open());
        if (pSoundSource.isNull()) {
            qWarning() << "Failed to open file for analyzing:" << nextTrack->getLocation();
            continue;
        }

        int iNumSamples = pSoundSource->length();
        int iSampleRate = pSoundSource->getSampleRate();

        if (iNumSamples == 0 || iSampleRate == 0) {
            qWarning() << "Skipping invalid file:" << nextTrack->getLocation();
            continue;
        }

        QListIterator<Analyser*> it(m_aq);
        bool processTrack = false;
        while (it.hasNext()) {
            // Make sure not to short-circuit initialise(...)
            if (it.next()->initialise(nextTrack, iSampleRate, iNumSamples)) {
                processTrack = true;
            }
        }

        m_qm.lock();
        m_queue_size = m_tioq.size();
        m_qm.unlock();

        if (processTrack) {
            emitUpdateProgress(nextTrack, 0);
            bool completed = doAnalysis(nextTrack, pSoundSource);
            if (!completed) {
                //This track was cancelled
                QListIterator<Analyser*> itf(m_aq);
                while (itf.hasNext()) {
                    itf.next()->cleanup(nextTrack);
                }
                queueAnalyseTrack(nextTrack);
                emitUpdateProgress(nextTrack, 0);
            } else {
                // 100% - FINALIZE_PERCENT finished
                emitUpdateProgress(nextTrack, 1000 - FINALIZE_PERCENT);
                // This takes around 3 sec on a Atom Netbook
                QListIterator<Analyser*> itf(m_aq);
                while (itf.hasNext()) {
                    itf.next()->finalise(nextTrack);
                }
                emit(trackDone(nextTrack));
                emitUpdateProgress(nextTrack, 1000); // 100%
            }
        } else {
            emitUpdateProgress(nextTrack, 1000); // 100%
            qDebug() << "Skipping track analysis because no analyzer initialized.";
        }

        m_qm.lock();
        m_queue_size = m_tioq.size();
        m_qm.unlock();
        if (m_queue_size == 0) {
            emit(queueEmpty()); // emit asynchrony for no deadlock
        }
    }
    emit(queueEmpty()); // emit in case of exit;
//.........这里部分代码省略.........

TEST_F(CueControlTest, OutroCue_SetStartEnd_ClearStartEnd) {
    TrackPointer pTrack = createAndLoadFakeTrack();

    // Set outro start cue
    setCurrentSample(750.0);
    m_pOutroStartSet->slotSet(1);
    m_pOutroStartSet->slotSet(0);
    EXPECT_DOUBLE_EQ(750.0, m_pOutroStartPosition->get());
    EXPECT_TRUE(m_pOutroStartEnabled->toBool());
    EXPECT_DOUBLE_EQ(-1.0, m_pOutroEndPosition->get());
    EXPECT_FALSE(m_pOutroEndEnabled->toBool());

    CuePointer pCue = pTrack->findCueByType(Cue::OUTRO);
    EXPECT_NE(nullptr, pCue);
    if (pCue != nullptr) {
        EXPECT_DOUBLE_EQ(750.0, pCue->getPosition());
        EXPECT_DOUBLE_EQ(0.0, pCue->getLength());
        EXPECT_DOUBLE_EQ(Cue::MANUAL, pCue->getSource());
    }

    // Set outro end cue
    setCurrentSample(1000.0);
    m_pOutroEndSet->slotSet(1);
    m_pOutroEndSet->slotSet(0);
    EXPECT_DOUBLE_EQ(750.0, m_pOutroStartPosition->get());
    EXPECT_TRUE(m_pOutroStartEnabled->toBool());
    EXPECT_DOUBLE_EQ(1000.0, m_pOutroEndPosition->get());
    EXPECT_TRUE(m_pOutroEndEnabled->toBool());

    pCue = pTrack->findCueByType(Cue::OUTRO);
    EXPECT_NE(nullptr, pCue);
    if (pCue != nullptr) {
        EXPECT_DOUBLE_EQ(750.0, pCue->getPosition());
        EXPECT_DOUBLE_EQ(250.0, pCue->getLength());
        EXPECT_DOUBLE_EQ(Cue::MANUAL, pCue->getSource());
    }

    // Clear outro start cue
    m_pOutroStartClear->slotSet(1);
    m_pOutroStartClear->slotSet(0);
    EXPECT_DOUBLE_EQ(-1.0, m_pOutroStartPosition->get());
    EXPECT_FALSE(m_pOutroStartEnabled->toBool());
    EXPECT_DOUBLE_EQ(1000.0, m_pOutroEndPosition->get());
    EXPECT_TRUE(m_pOutroEndEnabled->toBool());

    pCue = pTrack->findCueByType(Cue::OUTRO);
    EXPECT_NE(nullptr, pCue);
    if (pCue != nullptr) {
        EXPECT_DOUBLE_EQ(-1.0, pCue->getPosition());
        EXPECT_DOUBLE_EQ(1000.0, pCue->getLength());
        EXPECT_DOUBLE_EQ(Cue::MANUAL, pCue->getSource());
    }

    // Clear outro end cue
    m_pOutroEndClear->slotSet(1);
    m_pOutroEndClear->slotSet(0);
    EXPECT_DOUBLE_EQ(-1.0, m_pOutroStartPosition->get());
    EXPECT_FALSE(m_pOutroStartEnabled->toBool());
    EXPECT_DOUBLE_EQ(-1.0, m_pOutroEndPosition->get());
    EXPECT_FALSE(m_pOutroEndEnabled->toBool());

    EXPECT_EQ(nullptr, pTrack->findCueByType(Cue::OUTRO));
}