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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/midi/midi_manager_mac.h"
#include <iostream>
#include <string>
#include "base/debug/trace_event.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/sys_string_conversions.h"
#include <CoreAudio/HostTime.h>
using base::IntToString;
using base::SysCFStringRefToUTF8;
using std::string;
// NB: System MIDI types are pointer types in 32-bit and integer types in
// 64-bit. Therefore, the initialization is the simplest one that satisfies both
// (if possible).
namespace media {
MIDIManager* MIDIManager::Create() {
return new MIDIManagerMac();
}
MIDIManagerMac::MIDIManagerMac()
: midi_client_(0),
coremidi_input_(0),
coremidi_output_(0),
packet_list_(NULL),
midi_packet_(NULL) {
}
bool MIDIManagerMac::Initialize() {
TRACE_EVENT0("midi", "MIDIManagerMac::Initialize");
// CoreMIDI registration.
midi_client_ = 0;
OSStatus result = MIDIClientCreate(
CFSTR("Google Chrome"),
NULL,
NULL,
&midi_client_);
if (result != noErr)
return false;
coremidi_input_ = 0;
// Create input and output port.
result = MIDIInputPortCreate(
midi_client_,
CFSTR("MIDI Input"),
ReadMidiDispatch,
this,
&coremidi_input_);
if (result != noErr)
return false;
result = MIDIOutputPortCreate(
midi_client_,
CFSTR("MIDI Output"),
&coremidi_output_);
if (result != noErr)
return false;
int destination_count = MIDIGetNumberOfDestinations();
destinations_.resize(destination_count);
for (int i = 0; i < destination_count ; i++) {
MIDIEndpointRef destination = MIDIGetDestination(i);
// Keep track of all destinations (known as outputs by the Web MIDI API).
// Cache to avoid any possible overhead in calling MIDIGetDestination().
destinations_[i] = destination;
MIDIPortInfo info = GetPortInfoFromEndpoint(destination);
AddOutputPort(info);
}
// Open connections from all sources.
int source_count = MIDIGetNumberOfSources();
for (int i = 0; i < source_count; ++i) {
// Receive from all sources.
MIDIEndpointRef src = MIDIGetSource(i);
MIDIPortConnectSource(coremidi_input_, src, reinterpret_cast<void*>(src));
// Keep track of all sources (known as inputs in Web MIDI API terminology).
source_map_[src] = i;
MIDIPortInfo info = GetPortInfoFromEndpoint(src);
AddInputPort(info);
}
// TODO(crogers): Fix the memory management here!
packet_list_ = reinterpret_cast<MIDIPacketList*>(midi_buffer_);
midi_packet_ = MIDIPacketListInit(packet_list_);
return true;
}
MIDIManagerMac::~MIDIManagerMac() {
if (coremidi_input_)
MIDIPortDispose(coremidi_input_);
if (coremidi_output_)
MIDIPortDispose(coremidi_output_);
}
void MIDIManagerMac::ReadMidiDispatch(const MIDIPacketList* packet_list,
void* read_proc_refcon,
void* src_conn_refcon) {
MIDIManagerMac* manager = static_cast<MIDIManagerMac*>(read_proc_refcon);
#if __LP64__
MIDIEndpointRef source = reinterpret_cast<uintptr_t>(src_conn_refcon);
#else
MIDIEndpointRef source = static_cast<MIDIEndpointRef>(src_conn_refcon);
#endif
// Dispatch to class method.
manager->ReadMidi(source, packet_list);
}
void MIDIManagerMac::ReadMidi(MIDIEndpointRef source,
const MIDIPacketList* packet_list) {
// Lookup the port index based on the source.
SourceMap::iterator j = source_map_.find(source);
if (j == source_map_.end())
return;
int port_index = source_map_[source];
// Go through each packet and process separately.
for(size_t i = 0; i < packet_list->numPackets; i++) {
// Each packet contains MIDI data for one or more messages (like note-on).
const MIDIPacket &packet = packet_list->packet[i];
double timestamp_seconds = MIDITimeStampToSeconds(packet.timeStamp);
ReceiveMIDIData(
port_index,
packet.data,
packet.length,
timestamp_seconds);
}
}
void MIDIManagerMac::SendMIDIData(MIDIManagerClient* client,
int port_index,
const uint8* data,
size_t length,
double timestamp) {
// System Exclusive has already been filtered.
MIDITimeStamp coremidi_timestamp = SecondsToMIDITimeStamp(timestamp);
midi_packet_ = MIDIPacketListAdd(
packet_list_,
kMaxPacketListSize,
midi_packet_,
coremidi_timestamp,
length,
data);
// Lookup the destination based on the port index.
// TODO(crogers): re-factor |port_index| to use unsigned
// to avoid the need for this check.
if (port_index < 0 ||
static_cast<size_t>(port_index) >= destinations_.size())
return;
MIDIEndpointRef destination = destinations_[port_index];
MIDISend(coremidi_output_, destination, packet_list_);
// Re-initialize for next time.
midi_packet_ = MIDIPacketListInit(packet_list_);
client->AccumulateMIDIBytesSent(length);
}
MIDIPortInfo MIDIManagerMac::GetPortInfoFromEndpoint(
MIDIEndpointRef endpoint) {
SInt32 id_number = 0;
MIDIObjectGetIntegerProperty(endpoint, kMIDIPropertyUniqueID, &id_number);
string id = IntToString(id_number);
CFStringRef manufacturer_ref = NULL;
MIDIObjectGetStringProperty(
endpoint, kMIDIPropertyManufacturer, &manufacturer_ref);
string manufacturer = SysCFStringRefToUTF8(manufacturer_ref);
CFStringRef name_ref = NULL;
MIDIObjectGetStringProperty(endpoint, kMIDIPropertyName, &name_ref);
string name = SysCFStringRefToUTF8(name_ref);
SInt32 version_number = 0;
MIDIObjectGetIntegerProperty(
endpoint, kMIDIPropertyDriverVersion, &version_number);
string version = IntToString(version_number);
return MIDIPortInfo(id, manufacturer, name, version);
}
double MIDIManagerMac::MIDITimeStampToSeconds(MIDITimeStamp timestamp) {
UInt64 nanoseconds = AudioConvertHostTimeToNanos(timestamp);
return static_cast<double>(nanoseconds) / 1.0e9;
}
MIDITimeStamp MIDIManagerMac::SecondsToMIDITimeStamp(double seconds) {
UInt64 nanos = UInt64(seconds * 1.0e9);
return AudioConvertNanosToHostTime(nanos);
}
} // namespace media
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