voice-to-keys/audiocapture.cpp at master · avin/voice-to-keys · GitHub

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#include "audiocapture.h"

#include <QByteArray>

AudioCapture::AudioCapture(QObject *parent)
    : QObject(parent) {}

bool AudioCapture::prepare(const QString &deviceId) {
    stop();
    prepared = false;
    audioSpec = AudioSpec{};

    if (!selectDevice(deviceId))
        return false;
    if (!selectFormat())
        return false;

    prepared = true;
    return true;
}

bool AudioCapture::start() {
    if (!prepared)
        return false;

    if (audioIODevice != nullptr) {
        return true;
    }

    // Ensure previous input is fully released
    releaseInput();

    audioSource = new QAudioSource(audioDevice, audioFormat, this);
    audioIODevice = audioSource->start();

    if (!audioIODevice) {
        emit errorOccurred(tr("Failed to start audio input."));
        releaseInput();
        return false;
    }

    connect(audioIODevice, &QIODevice::readyRead, this, &AudioCapture::handleReadyRead, Qt::UniqueConnection);
    return true;
}

void AudioCapture::stop() {
    releaseInput();
}

AudioSpec AudioCapture::spec() const {
    return audioSpec;
}

QAudioFormat AudioCapture::format() const {
    return audioFormat;
}

bool AudioCapture::isPrepared() const {
    return prepared;
}

void AudioCapture::handleReadyRead() {
    if (!audioIODevice)
        return;

    const QByteArray data = audioIODevice->readAll();
    if (!data.isEmpty()) {
        emit audioDataReady(data);
    }
}

bool AudioCapture::selectDevice(const QString &deviceId) {
    audioDevice = QAudioDevice();
    if (!deviceId.isEmpty()) {
        const QByteArray id = QByteArray::fromHex(deviceId.toLatin1());
        const auto devices = QMediaDevices::audioInputs();
        for (const auto &device : devices) {
            if (device.id() == id) {
                audioDevice = device;
                break;
            }
        }
    }

    if (audioDevice.isNull())
        audioDevice = QMediaDevices::defaultAudioInput();

    if (audioDevice.isNull()) {
        emit errorOccurred(tr("No audio input device available."));
        return false;
    }

    return true;
}

bool AudioCapture::selectFormat() {
    QAudioFormat target;
    target.setSampleRate(16000);
    target.setChannelCount(1);
    target.setSampleFormat(QAudioFormat::Int16);
    if (audioDevice.isFormatSupported(target)) {
        audioFormat = target;
    } else {
        audioFormat = audioDevice.preferredFormat();
    }

    bool ok = false;
    const QString formatName = sonioxFormatFor(audioFormat, &ok);
    if (!ok) {
        emit errorOccurred(tr("Unsupported audio format for streaming."));
        return false;
    }

    audioSpec.sampleRate = audioFormat.sampleRate();
    audioSpec.channels = audioFormat.channelCount();
    audioSpec.format = formatName;
    return audioSpec.sampleRate > 0 && audioSpec.channels > 0;
}

QString AudioCapture::sonioxFormatFor(const QAudioFormat &format, bool *ok) const {
    if (ok)
        *ok = false;

    switch (format.sampleFormat()) {
        case QAudioFormat::UInt8:
            if (ok) *ok = true;
            return QStringLiteral("pcm_u8");
        case QAudioFormat::Int16:
            if (ok) *ok = true;
            return QStringLiteral("pcm_s16le");
        case QAudioFormat::Int32:
            if (ok) *ok = true;
            return QStringLiteral("pcm_s32le");
        case QAudioFormat::Float:
            if (ok) *ok = true;
            return QStringLiteral("pcm_f32le");
        default:
            break;
    }

    return QString();
}

void AudioCapture::releaseInput() {
    // Disconnect any pending signals from old audioIODevice
    if (audioIODevice) {
        disconnect(audioIODevice, nullptr, this, nullptr);
        audioIODevice = nullptr;
    }

    if (audioSource) {
        audioSource->stop();
        audioSource->deleteLater();
        audioSource = nullptr;
    }
}