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livetrax/libs/backends/coreaudio/coremidi_io.cc

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/*
* Copyright (C) 2015 Robin Gareus <robin@gareus.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <sstream>
#include <CoreAudio/HostTime.h>
#include "coremidi_io.h"
#include "coreaudio_backend.h"
using namespace ARDOUR;
#ifndef NDEBUG
static int _debug_mode = 0;
#endif
/**
* MIDI Data flow
*
* (A) INPUT (incoming from outside the application)
*
* - midiInputCallback (in its own thread, async WRT process callback):
* takes OS X MIDIPacket, copies into lock-free ringbuffer
*
* - processCallback (in its own thread):
*
* (1) loop on all input ports:
* 1A) call recv_event() to read from ringbuffer into stack buffer, also assign-timestamp,
* 1B) call parse_events() using stack buffer, when appropriate
* pushes CoreMidiEvent into std::vector<CoreMidiEvent>
*
* (2) in MidiPort::cycle_start() (also part of the process callback call tree), MidiPort::get_midi_buffer()
* calls CoreAudioBackend::midi_event_get () returns a pointer to the data of the specified CoreMidiEvent
*/
static void notifyProc (const MIDINotification *message, void *refCon) {
CoreMidiIo *self = static_cast<CoreMidiIo*>(refCon);
self->notify_proc(message);
}
#ifndef NDEBUG
static void print_packet (const MIDIPacket *p) {
fprintf (stderr, "CoreMIDI: Packet %d bytes [ ", p->length);
for (int bb = 0; bb < p->length; ++bb) {
fprintf (stderr, "%02x ", ((uint8_t*)p->data)[bb]);
}
fprintf (stderr, "]\n");
}
static void dump_packet_list (const UInt32 numPackets, MIDIPacket const *p) {
for (UInt32 i = 0; i < numPackets; ++i) {
print_packet (p);
p = MIDIPacketNext (p);
}
}
#endif
static void midiInputCallback(const MIDIPacketList *list, void *procRef, void *srcRef) {
CoreMidiIo *self = static_cast<CoreMidiIo*> (procRef);
if (!self || !self->enabled()) {
// skip while freewheeling
#ifndef NDEBUG
if (_debug_mode & 2) {
fprintf (stderr, "Ignored Midi Packet while freewheeling:\n");
dump_packet_list (list->numPackets, &list->packet[0]);
}
#endif
return;
}
RingBuffer<uint8_t> * rb = static_cast<RingBuffer < uint8_t > *> (srcRef);
if (!rb) {
#ifndef NDEBUG
if (_debug_mode & 4) {
fprintf (stderr, "Ignored Midi Packet - no ringbuffer:\n");
dump_packet_list (list->numPackets, &list->packet[0]);
}
#endif
return;
}
MIDIPacket const *p = &list->packet[0];
for (UInt32 i = 0; i < list->numPackets; ++i) {
uint32_t len = ((p->length + 3)&~3) + sizeof(MIDITimeStamp) + sizeof(UInt16);
#ifndef NDEBUG
if (_debug_mode & 1) {
print_packet (p);
}
#endif
if (rb->write_space() > sizeof(uint32_t) + len) {
rb->write ((uint8_t*)&len, sizeof(uint32_t));
rb->write ((uint8_t*)p, len);
}
#ifndef NDEBUG
else {
fprintf (stderr, "CoreMIDI: dropped MIDI event\n");
}
#endif
p = MIDIPacketNext (p);
}
}
static std::string getPropertyString (MIDIObjectRef object, CFStringRef key)
{
CFStringRef name = NULL;
std::string rv = "";
if (noErr == MIDIObjectGetStringProperty(object, key, &name)) {
const CFIndex size = CFStringGetMaximumSizeForEncoding(CFStringGetLength(name), kCFStringEncodingUTF8);
char *tmp = (char*) malloc(size);
if (CFStringGetCString(name, tmp, size, kCFStringEncodingUTF8)) {
rv = tmp;
}
free(tmp);
CFRelease(name);
}
return rv;
}
static std::string getDisplayName (MIDIObjectRef object) {
return getPropertyString(object, kMIDIPropertyDisplayName);
}
CoreMidiIo::CoreMidiIo()
: _midi_client (0)
, _input_endpoints (0)
, _output_endpoints (0)
, _input_ports (0)
, _output_ports (0)
, _input_queue (0)
, _rb (0)
, _n_midi_in (0)
, _n_midi_out (0)
, _time_at_cycle_start (0)
, _active (false)
, _enabled (true)
, _run (false)
, _changed_callback (0)
, _changed_arg (0)
{
pthread_mutex_init (&_discovery_lock, 0);
#ifndef NDEBUG
const char *p = getenv ("COREMIDIDEBUG");
if (p && *p) _debug_mode = atoi (p);
#endif
}
CoreMidiIo::~CoreMidiIo()
{
pthread_mutex_lock (&_discovery_lock);
cleanup();
if (_midi_client) {
MIDIClientDispose(_midi_client);
_midi_client = 0;
}
pthread_mutex_unlock (&_discovery_lock);
pthread_mutex_destroy (&_discovery_lock);
}
void
CoreMidiIo::cleanup()
{
_active = false;
for (uint32_t i = 0 ; i < _n_midi_in ; ++i) {
MIDIPortDispose(_input_ports[i]);
_input_queue[i].clear();
delete _rb[i];
}
for (uint32_t i = 0 ; i < _n_midi_out ; ++i) {
MIDIPortDispose(_output_ports[i]);
}
free(_input_ports); _input_ports = 0;
free(_input_endpoints); _input_endpoints = 0;
free(_input_queue); _input_queue = 0;
free(_output_ports); _output_ports = 0;
free(_output_endpoints); _output_endpoints = 0;
free(_rb); _rb = 0;
_n_midi_in = 0;
_n_midi_out = 0;
}
void
CoreMidiIo::start_cycle()
{
_time_at_cycle_start = AudioGetCurrentHostTime();
}
void
CoreMidiIo::notify_proc(const MIDINotification *message)
{
switch(message->messageID) {
case kMIDIMsgSetupChanged:
/* this one catches all of the added/removed/changed below */
//printf("kMIDIMsgSetupChanged\n");
discover();
break;
case kMIDIMsgObjectAdded:
{
//const MIDIObjectAddRemoveNotification *n = (const MIDIObjectAddRemoveNotification*) message;
//printf("kMIDIMsgObjectAdded\n");
}
break;
case kMIDIMsgObjectRemoved:
{
//const MIDIObjectAddRemoveNotification *n = (const MIDIObjectAddRemoveNotification*) message;
//printf("kMIDIMsgObjectRemoved\n");
}
break;
case kMIDIMsgPropertyChanged:
{
//const MIDIObjectPropertyChangeNotification *n = (const MIDIObjectPropertyChangeNotification*) message;
//printf("kMIDIMsgObjectRemoved\n");
}
break;
case kMIDIMsgThruConnectionsChanged:
//printf("kMIDIMsgThruConnectionsChanged\n");
break;
case kMIDIMsgSerialPortOwnerChanged:
//printf("kMIDIMsgSerialPortOwnerChanged\n");
break;
case kMIDIMsgIOError:
fprintf(stderr, "kMIDIMsgIOError\n");
discover();
break;
}
}
size_t
CoreMidiIo::recv_event (uint32_t port, double cycle_time_us, uint64_t &time, uint8_t *d, size_t &s)
{
if (!_active || _time_at_cycle_start == 0) {
return 0;
}
assert(port < _n_midi_in);
const size_t minsize = 1 + sizeof(uint32_t) + sizeof(MIDITimeStamp) + sizeof(UInt16);
while (_rb[port]->read_space() > minsize) {
MIDIPacket packet;
size_t rv;
uint32_t s = 0;
rv = _rb[port]->read((uint8_t*)&s, sizeof(uint32_t));
assert(rv == sizeof(uint32_t));
rv = _rb[port]->read((uint8_t*)&packet, s);
assert(rv == s);
_input_queue[port].push_back(boost::shared_ptr<CoreMIDIPacket>(new _CoreMIDIPacket (&packet)));
}
UInt64 start = _time_at_cycle_start;
UInt64 end = AudioConvertNanosToHostTime(AudioConvertHostTimeToNanos(_time_at_cycle_start) + cycle_time_us * 1e3);
for (CoreMIDIQueue::iterator it = _input_queue[port].begin (); it != _input_queue[port].end (); ) {
if ((*it)->timeStamp < end) {
if ((*it)->timeStamp < start) {
uint64_t dt = AudioConvertHostTimeToNanos(start - (*it)->timeStamp);
if (dt > 1e7) { // 10ms,
#ifndef NDEBUG
printf("Dropped Stale Midi Event. dt:%.2fms\n", dt * 1e-6);
#endif
it = _input_queue[port].erase(it);
continue;
} else {
#if 0
printf("Stale Midi Event. dt:%.2fms\n", dt * 1e-6);
#endif
}
time = 0;
} else {
time = AudioConvertHostTimeToNanos((*it)->timeStamp - start);
}
s = std::min(s, (size_t) (*it)->length);
if (s > 0) {
memcpy(d, (*it)->data, s);
}
_input_queue[port].erase(it);
return s;
}
++it;
}
return 0;
}
int
CoreMidiIo::send_events (uint32_t port, double timescale, const void *b)
{
if (!_active || _time_at_cycle_start == 0) {
return 0;
}
assert(port < _n_midi_out);
const UInt64 ts = AudioConvertHostTimeToNanos(_time_at_cycle_start);
const CoreMidiBuffer *src = static_cast<CoreMidiBuffer const *>(b);
int32_t bytes[8192]; // int for alignment
MIDIPacketList *mpl = (MIDIPacketList*)bytes;
MIDIPacket *cur = MIDIPacketListInit(mpl);
for (CoreMidiBuffer::const_iterator mit = src->begin (); mit != src->end (); ++mit) {
assert((*mit)->size() < 256);
cur = MIDIPacketListAdd(mpl, sizeof(bytes), cur,
AudioConvertNanosToHostTime(ts + (*mit)->timestamp() / timescale),
(*mit)->size(), (*mit)->data());
if (!cur) {
#ifndef DEBUG
printf("CoreMidi: Packet list overflow, dropped events\n");
#endif
break;
}
}
if (mpl->numPackets > 0) {
MIDISend(_output_ports[port], _output_endpoints[port], mpl);
}
return 0;
}
int
CoreMidiIo::send_event (uint32_t port, double reltime_us, const uint8_t *d, const size_t s)
{
if (!_active || _time_at_cycle_start == 0) {
return 0;
}
assert(port < _n_midi_out);
UInt64 ts = AudioConvertHostTimeToNanos(_time_at_cycle_start);
ts += reltime_us * 1e3;
// TODO use a single packet list.. queue all events first..
MIDIPacketList pl;
pl.numPackets = 1;
MIDIPacket *mp = &(pl.packet[0]);
mp->timeStamp = AudioConvertNanosToHostTime(ts);
mp->length = s;
assert(s < 256);
memcpy(mp->data, d, s);
MIDISend(_output_ports[port], _output_endpoints[port], &pl);
return 0;
}
std::string
CoreMidiIo::port_id (uint32_t port, bool input)
{
std::stringstream ss;
if (input) {
ss << "system:midi_capture_";
SInt32 id;
if (noErr == MIDIObjectGetIntegerProperty(_input_endpoints[port], kMIDIPropertyUniqueID, &id)) {
ss << (unsigned int)id;
} else {
ss << port;
}
} else {
ss << "system:midi_playback_";
SInt32 id;
if (noErr == MIDIObjectGetIntegerProperty(_output_endpoints[port], kMIDIPropertyUniqueID, &id)) {
ss << (unsigned int)id;
} else {
ss << port;
}
}
return ss.str();
}
std::string
CoreMidiIo::port_name (uint32_t port, bool input)
{
if (input) {
if (port < _n_midi_in) {
return getDisplayName(_input_endpoints[port]);
}
} else {
if (port < _n_midi_out) {
return getDisplayName(_output_endpoints[port]);
}
}
return "";
}
void
CoreMidiIo::start () {
_run = true;
if (!_midi_client) {
OSStatus err;
err = MIDIClientCreate(CFSTR("Ardour"), &notifyProc, this, &_midi_client);
if (noErr != err) {
fprintf(stderr, "Creating Midi Client failed\n");
}
}
discover();
}
void
CoreMidiIo::stop ()
{
_run = false;
pthread_mutex_lock (&_discovery_lock);
cleanup();
pthread_mutex_unlock (&_discovery_lock);
#if 0
if (_midi_client) {
MIDIClientDispose(_midi_client);
_midi_client = 0;
}
#endif
}
void
CoreMidiIo::discover()
{
if (!_run || !_midi_client) { return; }
if (pthread_mutex_trylock (&_discovery_lock)) {
return;
}
cleanup();
ItemCount srcCount = MIDIGetNumberOfSources();
ItemCount dstCount = MIDIGetNumberOfDestinations();
if (srcCount > 0) {
_input_ports = (MIDIPortRef *) malloc (srcCount * sizeof(MIDIPortRef));
_input_endpoints = (MIDIEndpointRef*) malloc (srcCount * sizeof(MIDIEndpointRef));
_input_queue = (CoreMIDIQueue*) calloc (srcCount, sizeof(CoreMIDIQueue));
_rb = (RingBuffer<uint8_t> **) malloc (srcCount * sizeof(RingBuffer<uint8_t>*));
}
if (dstCount > 0) {
_output_ports = (MIDIPortRef *) malloc (dstCount * sizeof(MIDIPortRef));
_output_endpoints = (MIDIEndpointRef*) malloc (dstCount * sizeof(MIDIEndpointRef));
}
for (ItemCount i = 0; i < srcCount; i++) {
OSStatus err;
MIDIEndpointRef src = MIDIGetSource(i);
if (!src) continue;
#ifndef NDEBUG
printf("MIDI IN DEVICE: %s\n", getDisplayName(src).c_str());
#endif
CFStringRef port_name;
port_name = CFStringCreateWithFormat(NULL, NULL, CFSTR("midi_capture_%lu"), i);
err = MIDIInputPortCreate (_midi_client, port_name, midiInputCallback, this, &_input_ports[_n_midi_in]);
if (noErr != err) {
fprintf(stderr, "Cannot create Midi Output\n");
continue;
}
_rb[_n_midi_in] = new RingBuffer<uint8_t>(32768);
_input_queue[_n_midi_in] = CoreMIDIQueue();
MIDIPortConnectSource(_input_ports[_n_midi_in], src, (void*) _rb[_n_midi_in]);
CFRelease(port_name);
_input_endpoints[_n_midi_in] = src;
++_n_midi_in;
}
for (ItemCount i = 0; i < dstCount; i++) {
MIDIEndpointRef dst = MIDIGetDestination(i);
CFStringRef port_name;
port_name = CFStringCreateWithFormat(NULL, NULL, CFSTR("midi_playback_%lu"), i);
OSStatus err;
err = MIDIOutputPortCreate (_midi_client, port_name, &_output_ports[_n_midi_out]);
if (noErr != err) {
fprintf(stderr, "Cannot create Midi Output\n");
continue;
}
#ifndef NDEBUG
printf("MIDI OUT DEVICE: %s\n", getDisplayName(dst).c_str());
#endif
MIDIPortConnectSource(_output_ports[_n_midi_out], dst, NULL);
CFRelease(port_name);
_output_endpoints[_n_midi_out] = dst;
++_n_midi_out;
}
if (_changed_callback) {
_changed_callback(_changed_arg);
}
_active = true;
pthread_mutex_unlock (&_discovery_lock);
}
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