C++ AudioMixerClientData::getCodecName方法代码示例

void sendMixPacket(const SharedNodePointer& node, AudioMixerClientData& data, QByteArray& buffer) {
    const int MIX_PACKET_SIZE =
        sizeof(quint16) + AudioConstants::MAX_CODEC_NAME_LENGTH_ON_WIRE + AudioConstants::NETWORK_FRAME_BYTES_STEREO;
    quint16 sequence = data.getOutgoingSequenceNumber();
    QString codec = data.getCodecName();
    auto mixPacket = createAudioPacket(PacketType::MixedAudio, MIX_PACKET_SIZE, sequence, codec);

    // pack samples
    mixPacket->write(buffer.constData(), buffer.size());

    // send packet
    DependencyManager::get<NodeList>()->sendPacket(std::move(mixPacket), *node);
    data.incrementOutgoingMixedAudioSequenceNumber();
}

void sendSilentPacket(const SharedNodePointer& node, AudioMixerClientData& data) {
    const int SILENT_PACKET_SIZE =
        sizeof(quint16) + AudioConstants::MAX_CODEC_NAME_LENGTH_ON_WIRE + sizeof(quint16);
    quint16 sequence = data.getOutgoingSequenceNumber();
    QString codec = data.getCodecName();
    auto mixPacket = createAudioPacket(PacketType::SilentAudioFrame, SILENT_PACKET_SIZE, sequence, codec);

    // pack number of samples
    mixPacket->writePrimitive(AudioConstants::NETWORK_FRAME_SAMPLES_STEREO);

    // send packet
    DependencyManager::get<NodeList>()->sendPacket(std::move(mixPacket), *node);
    data.incrementOutgoingMixedAudioSequenceNumber();
}

void AudioMixer::broadcastMixes() {
    auto nodeList = DependencyManager::get<NodeList>();

    auto nextFrameTimestamp = p_high_resolution_clock::now();
    auto timeToSleep = std::chrono::microseconds(0);

    const int TRAILING_AVERAGE_FRAMES = 100;
    int framesSinceCutoffEvent = TRAILING_AVERAGE_FRAMES;

    int currentFrame { 1 };
    int numFramesPerSecond { (int) ceil(AudioConstants::NETWORK_FRAMES_PER_SEC) };

    while (!_isFinished) {
        const float STRUGGLE_TRIGGER_SLEEP_PERCENTAGE_THRESHOLD = 0.10f;
        const float BACK_OFF_TRIGGER_SLEEP_PERCENTAGE_THRESHOLD = 0.20f;

        const float RATIO_BACK_OFF = 0.02f;

        const float CURRENT_FRAME_RATIO = 1.0f / TRAILING_AVERAGE_FRAMES;
        const float PREVIOUS_FRAMES_RATIO = 1.0f - CURRENT_FRAME_RATIO;

        if (timeToSleep.count() < 0) {
            timeToSleep = std::chrono::microseconds(0);
        }

        _trailingSleepRatio = (PREVIOUS_FRAMES_RATIO * _trailingSleepRatio)
            + (timeToSleep.count() * CURRENT_FRAME_RATIO / (float) AudioConstants::NETWORK_FRAME_USECS);

        float lastCutoffRatio = _performanceThrottlingRatio;
        bool hasRatioChanged = false;

        if (framesSinceCutoffEvent >= TRAILING_AVERAGE_FRAMES) {
            if (_trailingSleepRatio <= STRUGGLE_TRIGGER_SLEEP_PERCENTAGE_THRESHOLD) {
                // we're struggling - change our min required loudness to reduce some load
                _performanceThrottlingRatio = _performanceThrottlingRatio + (0.5f * (1.0f - _performanceThrottlingRatio));

                qDebug() << "Mixer is struggling, sleeping" << _trailingSleepRatio * 100 << "% of frame time. Old cutoff was"
                    << lastCutoffRatio << "and is now" << _performanceThrottlingRatio;
                hasRatioChanged = true;
            } else if (_trailingSleepRatio >= BACK_OFF_TRIGGER_SLEEP_PERCENTAGE_THRESHOLD && _performanceThrottlingRatio != 0) {
                // we've recovered and can back off the required loudness
                _performanceThrottlingRatio = _performanceThrottlingRatio - RATIO_BACK_OFF;

                if (_performanceThrottlingRatio < 0) {
                    _performanceThrottlingRatio = 0;
                }

                qDebug() << "Mixer is recovering, sleeping" << _trailingSleepRatio * 100 << "% of frame time. Old cutoff was"
                    << lastCutoffRatio << "and is now" << _performanceThrottlingRatio;
                hasRatioChanged = true;
            }

            if (hasRatioChanged) {
                // set out min audability threshold from the new ratio
                _minAudibilityThreshold = LOUDNESS_TO_DISTANCE_RATIO / (2.0f * (1.0f - _performanceThrottlingRatio));
                qDebug() << "Minimum audability required to be mixed is now" << _minAudibilityThreshold;

                framesSinceCutoffEvent = 0;
            }
        }

        if (!hasRatioChanged) {
            ++framesSinceCutoffEvent;
        }

        nodeList->eachNode([&](const SharedNodePointer& node) {

            if (node->getLinkedData()) {
                AudioMixerClientData* nodeData = (AudioMixerClientData*)node->getLinkedData();

                // this function will attempt to pop a frame from each audio stream.
                // a pointer to the popped data is stored as a member in InboundAudioStream.
                // That's how the popped audio data will be read for mixing (but only if the pop was successful)
                nodeData->checkBuffersBeforeFrameSend();

                // if the stream should be muted, send mute packet
                if (nodeData->getAvatarAudioStream()
                    && shouldMute(nodeData->getAvatarAudioStream()->getQuietestFrameLoudness())) {
                    auto mutePacket = NLPacket::create(PacketType::NoisyMute, 0);
                    nodeList->sendPacket(std::move(mutePacket), *node);
                }

                if (node->getType() == NodeType::Agent && node->getActiveSocket()
                    && nodeData->getAvatarAudioStream()) {

                    bool mixHasAudio = prepareMixForListeningNode(node.data());

                    std::unique_ptr<NLPacket> mixPacket;

                    if (mixHasAudio) {
                        int mixPacketBytes = sizeof(quint16) + AudioConstants::MAX_CODEC_NAME_LENGTH_ON_WIRE 
                                                             + AudioConstants::NETWORK_FRAME_BYTES_STEREO;
                        mixPacket = NLPacket::create(PacketType::MixedAudio, mixPacketBytes);

                        // pack sequence number
                        quint16 sequence = nodeData->getOutgoingSequenceNumber();
                        mixPacket->writePrimitive(sequence);

                        // write the codec
                        QString codecInPacket = nodeData->getCodecName();
//.........这里部分代码省略.........