open_device()

bool MayaFlux::Core::MIDIBackend::open_device ( uint32_t  device_id )

overridevirtual

Open a device for input.

Parameters

device_id

Device identifier from get_devices()

Returns

true if device was opened successfully

Implements MayaFlux::Core::IInputBackend.

Definition at line 209 of file MIDIBackend.cpp.

{
    std::lock_guard lock(m_devices_mutex);
 
    if (m_open_devices.find(device_id) != m_open_devices.end()) {
        MF_WARN(Journal::Component::Core, Journal::Context::InputBackend,
            "MIDI port {} already open", device_id);
        return true;
    }
 
    auto it = m_enumerated_devices.find(device_id);
    if (it == m_enumerated_devices.end()) {
        MF_ERROR(Journal::Component::Core, Journal::Context::InputBackend,
            "MIDI port {} not found", device_id);
        return false;
    }
 
    try {
        auto state = std::make_shared<MIDIPortState>();
        state->info = it->second;
        state->device_id = device_id;
        state->input_callback = m_input_callback;
        state->midi_in = std::make_unique<RtMidiIn>();
 
        state->midi_in->openPort(state->info.rtmidi_port_number, state->info.name);
        state->midi_in->setCallback(&MIDIBackend::rtmidi_callback, state.get());
        state->midi_in->ignoreTypes(false, false, false);
        state->active.store(true);
 
        m_open_devices.insert_or_assign(device_id, state);
 
        MF_INFO(Journal::Component::Core, Journal::Context::InputBackend,
            "Opened MIDI port {}: {}", device_id, state->info.name);
 
        return true;
 
    } catch (const RtMidiError& error) {
        MF_ERROR(Journal::Component::Core, Journal::Context::InputBackend,
            "Failed to open MIDI port {}: {}", it->second.name, error.getMessage());
        return false;
    }
}

References MayaFlux::Journal::Core, MayaFlux::Journal::InputBackend, m_devices_mutex, m_enumerated_devices, m_input_callback, m_open_devices, MF_ERROR, MF_INFO, MF_WARN, and rtmidi_callback().

Referenced by MayaFlux::Core::InputSubsystem::initialize_midi_backend(), and start().

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