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/**
* @file portmidicontroller.h
* @author Albert Santoni alberts@mixxx.org
* @author Sean M. Pappalardo spappalardo@mixxx.org
* @date Thu 15 Mar 2012
* @brief PortMidi-based MIDI backend
*
*/
#include "controllers/midi/portmidicontroller.h"
#include "controllers/controllerdebug.h"
PortMidiController::PortMidiController(const PmDeviceInfo* inputDeviceInfo,
const PmDeviceInfo* outputDeviceInfo,
int inputDeviceIndex,
int outputDeviceIndex)
: MidiController(),
m_cReceiveMsg_index(0),
m_bInSysex(false) {
for (unsigned int k = 0; k < MIXXX_PORTMIDI_BUFFER_LEN; ++k) {
// Can be shortened to `m_midiBuffer[k] = {}` with C++11.
m_midiBuffer[k].message = 0;
m_midiBuffer[k].timestamp = 0;
}
// Note: We prepend the input stream's index to the device's name to prevent
// duplicate devices from causing mayhem.
//setDeviceName(QString("%1. %2").arg(QString::number(m_iInputDeviceIndex), inputDeviceInfo->name));
if (inputDeviceInfo) {
setDeviceName(QString("%1").arg(inputDeviceInfo->name));
setInputDevice(inputDeviceInfo->input);
m_pInputDevice.reset(new PortMidiDevice(
inputDeviceInfo, inputDeviceIndex));
}
if (outputDeviceInfo) {
if (inputDeviceInfo == NULL) {
setDeviceName(QString("%1").arg(outputDeviceInfo->name));
}
setOutputDevice(outputDeviceInfo->output);
m_pOutputDevice.reset(new PortMidiDevice(
outputDeviceInfo, outputDeviceIndex));
}
}
PortMidiController::~PortMidiController() {
if (isOpen()) {
close();
}
}
int PortMidiController::open() {
if (isOpen()) {
qDebug() << "PortMIDI device" << getName() << "already open";
return -1;
}
if (getName() == MIXXX_PORTMIDI_NO_DEVICE_STRING)
return -1;
m_bInSysex = false;
m_cReceiveMsg_index = 0;
if (m_pInputDevice && isInputDevice()) {
controllerDebug("PortMidiController: Opening"
<< m_pInputDevice->info()->name << "index"
<< m_pInputDevice->index() << "for input");
PmError err = m_pInputDevice->openInput(MIXXX_PORTMIDI_BUFFER_LEN);
if (err != pmNoError) {
qWarning() << "PortMidi error:" << Pm_GetErrorText(err);
return -2;
}
}
if (m_pOutputDevice && isOutputDevice()) {
controllerDebug("PortMidiController: Opening"
<< m_pOutputDevice->info()->name << "index"
<< m_pOutputDevice->index() << "for output");
PmError err = m_pOutputDevice->openOutput();
if (err != pmNoError) {
qWarning() << "PortMidi error:" << Pm_GetErrorText(err);
return -2;
}
}
setOpen(true);
startEngine();
return 0;
}
int PortMidiController::close() {
if (!isOpen()) {
qDebug() << "PortMIDI device" << getName() << "already closed";
return -1;
}
stopEngine();
MidiController::close();
int result = 0;
if (m_pInputDevice && m_pInputDevice->isOpen()) {
PmError err = m_pInputDevice->close();
if (err != pmNoError) {
qWarning() << "PortMidi error:" << Pm_GetErrorText(err);
result = -1;
}
}
if (m_pOutputDevice && m_pOutputDevice->isOpen()) {
PmError err = m_pOutputDevice->close();
if (err != pmNoError) {
qWarning() << "PortMidi error:" << Pm_GetErrorText(err);
result = -1;
}
}
setOpen(false);
return result;
}
bool PortMidiController::poll() {
// Poll the controller for new data if it's an input device
if (m_pInputDevice.isNull() || !m_pInputDevice->isOpen()) {
return false;
}
// Returns true if events are available or an error code.
PmError gotEvents = m_pInputDevice->poll();
if (gotEvents == FALSE) {
return false;
}
if (gotEvents < 0) {
qWarning() << "PortMidi error:" << Pm_GetErrorText(gotEvents);
return false;
}
int numEvents = m_pInputDevice->read(m_midiBuffer, MIXXX_PORTMIDI_BUFFER_LEN);
//qDebug() << "PortMidiController::poll()" << numEvents;
if (numEvents < 0) {
qWarning() << "PortMidi error:" << Pm_GetErrorText((PmError)numEvents);
return false;
}
for (int i = 0; i < numEvents; i++) {
unsigned char status = Pm_MessageStatus(m_midiBuffer[i].message);
mixxx::Duration timestamp = mixxx::Duration::fromMillis(m_midiBuffer[i].timestamp);
if ((status & 0xF8) == 0xF8) {
// Handle real-time MIDI messages at any time
receive(status, 0, 0, timestamp);
continue;
}
reprocessMessage:
if (!m_bInSysex) {
if (status == 0xF0) {
m_bInSysex = true;
status = 0;
} else {
//unsigned char channel = status & 0x0F;
unsigned char note = Pm_MessageData1(m_midiBuffer[i].message);
unsigned char velocity = Pm_MessageData2(m_midiBuffer[i].message);
receive(status, note, velocity, timestamp);
}
}
if (m_bInSysex) {
// Abort (drop) the current System Exclusive message if a
// non-realtime status byte was received
if (status > 0x7F && status < 0xF7) {
m_bInSysex = false;
m_cReceiveMsg_index = 0;
qWarning() << "Buggy MIDI device: SysEx interrupted!";
goto reprocessMessage; // Don't lose the new message
}
// Collect bytes from PmMessage
unsigned char data = 0;
for (int shift = 0; shift < 32 && (data != MIDI_EOX); shift += 8) {
// TODO(rryan): This prevents buffer overflow if the sysex is
// larger than 1024 bytes. I don't want to radically change
// anything before the 2.0 release so this will do for now.
data = (m_midiBuffer[i].message >> shift) & 0xFF;
if (m_cReceiveMsg_index < MIXXX_SYSEX_BUFFER_LEN) {
m_cReceiveMsg[m_cReceiveMsg_index++] = data;
}
}
// End System Exclusive message if the EOX byte was received
if (data == MIDI_EOX) {
m_bInSysex = false;
const char* buffer = reinterpret_cast<const char*>(m_cReceiveMsg);
receive(QByteArray::fromRawData(buffer, m_cReceiveMsg_index),
timestamp);
m_cReceiveMsg_index = 0;
}
}
}
return numEvents > 0;
}
void PortMidiController::sendWord(unsigned int word) {
if (m_pOutputDevice.isNull() || !m_pOutputDevice->isOpen()) {
return;
}
PmError err = m_pOutputDevice->writeShort(word);
if (err != pmNoError) {
qWarning() << "PortMidi sendShortMsg error:" << Pm_GetErrorText(err);
}
}
void PortMidiController::send(QByteArray data) {
// PortMidi does not receive a length argument for the buffer we provide to
// Pm_WriteSysEx. Instead, it scans for a MIDI_EOX byte to know when the
// message is over. If one is not provided, it will overflow the buffer and
// cause a segfault.
if (!data.endsWith(MIDI_EOX)) {
controllerDebug("SysEx message does not end with 0xF7 -- ignoring.");
return;
}
if (m_pOutputDevice.isNull() || !m_pOutputDevice->isOpen()) {
return;
}
PmError err = m_pOutputDevice->writeSysEx((unsigned char*)data.constData());
if (err != pmNoError) {
qWarning() << "PortMidi sendSysexMsg error:"
<< Pm_GetErrorText(err);
}
}
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