test_sdk/hw/gtl_hw_audio.cpp

#include "gtl_hw_audio.h"

namespace gtl
{
    namespace hw
    {
        audio::audio(int channels, QAudioFormat::SampleFormat sample_format, QObject *parent)
            : device{parent}
            , _sample_format(sample_format)
            , _audio_input(NULL)
        {
            _count_ai = channels;

            _audio_device = new audio_input_device(this);
            _audio_device->open(QIODevice::WriteOnly);

        }

        audio::~audio()
        {
            stop();
        }

        QString audio::type() const
        {
            return "audio";
        }

        bool audio::start(QString id, qreal rate)
        {
            _rate = rate;
            _id = id;

            const auto audio_inputs = QMediaDevices::audioInputs();

            auto iter = std::find_if(audio_inputs.begin(), audio_inputs.end(), [=](const QAudioDevice &device){return QString(device.id()) == id;});

            QString name;

            if(iter == audio_inputs.end())
                name = tr("unknown device");
            else
            {
                name = iter->description();


                _format.setSampleRate(_rate);
                _format.setChannelCount(_count_ai);
                _format.setSampleFormat(_sample_format);

                if(_audio_input != NULL)
                    delete _audio_input;

                _audio_input = new QAudioSource(_format);

            }


            set_ai();

            _device->set_name(tr("audio") + "[" + name + "]");
            _device->set_id(id);
            _device->set_rate(rate);

            _is_continue = true;



//            _buffer->seek(0);
            _audio_device->set_buffer(_rate, _format.bytesPerFrame());
            _audio_input->start(_audio_device);

            QThread::start(QThread::HighestPriority);

            emit status_changed(OK);

            return true;
        }

        bool audio::stop()
        {
            _is_continue = false;
            wait();
            if(_audio_input)
            {
                delete _audio_input;
                _audio_input = NULL;
            }


            return true;
        }

        void audio::run()
        {
            std::vector<char> buffer;
            std::vector<qreal> buffer_recv;
            int sample_bytes = _format.bytesPerSample();

            while(_is_continue)
            {
                buffer.clear();
                _audio_device->get_data(std::back_inserter(buffer));


                if(!buffer.empty())
                {
                    buffer_recv.clear();
                    for(int i = 0; i < buffer.size(); i += sample_bytes)
                    {
                        float value = _format.normalizedSampleValue(&buffer[i]);
                        buffer_recv.push_back(value);
                    }

                    set_ai_data(&buffer_recv[0], (int)buffer_recv.size());

                    emit received_data();

//                    _buffer->seek(0);

//                    qDebug() << "recieved data";
                }

                msleep(100);

            }
        }

        void audio::save(QDomElement &root_element)
        {
            device::save(root_element);
            root_element.setAttribute("sample_format", _sample_format);
        }

        void audio::load(const QDomElement &root_element)
        {
            device::load(root_element);
            _sample_format = (QAudioFormat::SampleFormat)root_element.attribute("sample_format", QString::number(_sample_format)).toInt();
        }
    }
}