media/midi/midi_manager_mac.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/midi/midi_manager_mac.h"
   6
   7 #include <string>
   8
   9 #include "base/debug/trace_event.h"
  10 #include "base/message_loop/message_loop.h"
  11 #include "base/strings/string_number_conversions.h"
  12 #include "base/strings/sys_string_conversions.h"
  13
  14 #include <CoreAudio/HostTime.h>
  15
  16 using base::IntToString;
  17 using base::SysCFStringRefToUTF8;
  18 using std::string;
  19
  20 // NB: System MIDI types are pointer types in 32-bit and integer types in
  21 // 64-bit. Therefore, the initialization is the simplest one that satisfies both
  22 // (if possible).
  23
  24 namespace media {
  25
  26 MIDIManager* MIDIManager::Create() {
  27   return new MIDIManagerMac();
  28 }
  29
  30 MIDIManagerMac::MIDIManagerMac()
  31     : midi_client_(0),
  32       coremidi_input_(0),
  33       coremidi_output_(0),
  34       packet_list_(NULL),
  35       midi_packet_(NULL),
  36       send_thread_("MIDISendThread") {
  37 }
  38
  39 bool MIDIManagerMac::Initialize() {
  40   TRACE_EVENT0("midi", "MIDIManagerMac::Initialize");
  41
  42   // CoreMIDI registration.
  43   midi_client_ = 0;
  44   OSStatus result = MIDIClientCreate(
  45       CFSTR("Google Chrome"),
  46       NULL,
  47       NULL,
  48       &midi_client_);
  49
  50   if (result != noErr)
  51     return false;
  52
  53   coremidi_input_ = 0;
  54
  55   // Create input and output port.
  56   result = MIDIInputPortCreate(
  57       midi_client_,
  58       CFSTR("MIDI Input"),
  59       ReadMIDIDispatch,
  60       this,
  61       &coremidi_input_);
  62   if (result != noErr)
  63     return false;
  64
  65   result = MIDIOutputPortCreate(
  66       midi_client_,
  67       CFSTR("MIDI Output"),
  68       &coremidi_output_);
  69   if (result != noErr)
  70     return false;
  71
  72   uint32 destination_count = MIDIGetNumberOfDestinations();
  73   destinations_.resize(destination_count);
  74
  75   for (uint32 i = 0; i < destination_count ; i++) {
  76     MIDIEndpointRef destination = MIDIGetDestination(i);
  77
  78     // Keep track of all destinations (known as outputs by the Web MIDI API).
  79     // Cache to avoid any possible overhead in calling MIDIGetDestination().
  80     destinations_[i] = destination;
  81
  82     MIDIPortInfo info = GetPortInfoFromEndpoint(destination);
  83     AddOutputPort(info);
  84   }
  85
  86   // Open connections from all sources.
  87   uint32 source_count = MIDIGetNumberOfSources();
  88
  89   for (uint32 i = 0; i < source_count; ++i)  {
  90     // Receive from all sources.
  91     MIDIEndpointRef src = MIDIGetSource(i);
  92     MIDIPortConnectSource(coremidi_input_, src, reinterpret_cast<void*>(src));
  93
  94     // Keep track of all sources (known as inputs in Web MIDI API terminology).
  95     source_map_[src] = i;
  96
  97     MIDIPortInfo info = GetPortInfoFromEndpoint(src);
  98     AddInputPort(info);
  99   }
 100
 101   // TODO(crogers): Fix the memory management here!
 102   packet_list_ = reinterpret_cast<MIDIPacketList*>(midi_buffer_);
 103   midi_packet_ = MIDIPacketListInit(packet_list_);
 104
 105   return true;
 106 }
 107
 108 void MIDIManagerMac::DispatchSendMIDIData(MIDIManagerClient* client,
 109                                           uint32 port_index,
 110                                           const std::vector<uint8>& data,
 111                                           double timestamp) {
 112   if (!send_thread_.IsRunning())
 113     send_thread_.Start();
 114
 115   // OK to use base::Unretained(this) since we join to thread in dtor().
 116   send_thread_.message_loop()->PostTask(
 117       FROM_HERE,
 118       base::Bind(&MIDIManagerMac::SendMIDIData, base::Unretained(this),
 119                  client, port_index, data, timestamp));
 120 }
 121
 122 MIDIManagerMac::~MIDIManagerMac() {
 123   // Wait for the termination of |send_thread_| before disposing MIDI ports.
 124   send_thread_.Stop();
 125
 126   if (coremidi_input_)
 127     MIDIPortDispose(coremidi_input_);
 128   if (coremidi_output_)
 129     MIDIPortDispose(coremidi_output_);
 130 }
 131
 132 // static
 133 void MIDIManagerMac::ReadMIDIDispatch(const MIDIPacketList* packet_list,
 134                                       void* read_proc_refcon,
 135                                       void* src_conn_refcon) {
 136   MIDIManagerMac* manager = static_cast<MIDIManagerMac*>(read_proc_refcon);
 137 #if __LP64__
 138   MIDIEndpointRef source = reinterpret_cast<uintptr_t>(src_conn_refcon);
 139 #else
 140   MIDIEndpointRef source = static_cast<MIDIEndpointRef>(src_conn_refcon);
 141 #endif
 142
 143   // Dispatch to class method.
 144   manager->ReadMIDI(source, packet_list);
 145 }
 146
 147 void MIDIManagerMac::ReadMIDI(MIDIEndpointRef source,
 148                               const MIDIPacketList* packet_list) {
 149   // Lookup the port index based on the source.
 150   SourceMap::iterator j = source_map_.find(source);
 151   if (j == source_map_.end())
 152     return;
 153   uint32 port_index = source_map_[source];
 154
 155   // Go through each packet and process separately.
 156   for (size_t i = 0; i < packet_list->numPackets; i++) {
 157     // Each packet contains MIDI data for one or more messages (like note-on).
 158     const MIDIPacket &packet = packet_list->packet[i];
 159     double timestamp_seconds = MIDITimeStampToSeconds(packet.timeStamp);
 160
 161     ReceiveMIDIData(
 162         port_index,
 163         packet.data,
 164         packet.length,
 165         timestamp_seconds);
 166   }
 167 }
 168
 169 void MIDIManagerMac::SendMIDIData(MIDIManagerClient* client,
 170                                   uint32 port_index,
 171                                   const std::vector<uint8>& data,
 172                                   double timestamp) {
 173   DCHECK(send_thread_.message_loop_proxy()->BelongsToCurrentThread());
 174
 175   // System Exclusive has already been filtered.
 176   MIDITimeStamp coremidi_timestamp = SecondsToMIDITimeStamp(timestamp);
 177
 178   midi_packet_ = MIDIPacketListAdd(
 179       packet_list_,
 180       kMaxPacketListSize,
 181       midi_packet_,
 182       coremidi_timestamp,
 183       data.size(),
 184       &data[0]);
 185
 186   // Lookup the destination based on the port index.
 187   if (static_cast<size_t>(port_index) >= destinations_.size())
 188     return;
 189
 190   MIDIEndpointRef destination = destinations_[port_index];
 191
 192   MIDISend(coremidi_output_, destination, packet_list_);
 193
 194   // Re-initialize for next time.
 195   midi_packet_ = MIDIPacketListInit(packet_list_);
 196
 197   client->AccumulateMIDIBytesSent(data.size());
 198 }
 199
 200 // static
 201 MIDIPortInfo MIDIManagerMac::GetPortInfoFromEndpoint(
 202     MIDIEndpointRef endpoint) {
 203   SInt32 id_number = 0;
 204   MIDIObjectGetIntegerProperty(endpoint, kMIDIPropertyUniqueID, &id_number);
 205   string id = IntToString(id_number);
 206
 207   string manufacturer;
 208   CFStringRef manufacturer_ref = NULL;
 209   OSStatus result = MIDIObjectGetStringProperty(
 210       endpoint, kMIDIPropertyManufacturer, &manufacturer_ref);
 211   if (result == noErr) {
 212     manufacturer = SysCFStringRefToUTF8(manufacturer_ref);
 213   } else {
 214     // kMIDIPropertyManufacturer is not supported in IAC driver providing
 215     // endpoints, and the result will be kMIDIUnknownProperty (-10835).
 216     DLOG(WARNING) << "Failed to get kMIDIPropertyManufacturer with status "
 217                   << result;
 218   }
 219
 220   string name;
 221   CFStringRef name_ref = NULL;
 222   result = MIDIObjectGetStringProperty(endpoint, kMIDIPropertyName, &name_ref);
 223   if (result == noErr)
 224     name = SysCFStringRefToUTF8(name_ref);
 225   else
 226     DLOG(WARNING) << "Failed to get kMIDIPropertyName with status " << result;
 227
 228   string version;
 229   SInt32 version_number = 0;
 230   result = MIDIObjectGetIntegerProperty(
 231       endpoint, kMIDIPropertyDriverVersion, &version_number);
 232   if (result == noErr) {
 233     version = IntToString(version_number);
 234   } else {
 235     // kMIDIPropertyDriverVersion is not supported in IAC driver providing
 236     // endpoints, and the result will be kMIDIUnknownProperty (-10835).
 237     DLOG(WARNING) << "Failed to get kMIDIPropertyDriverVersion with status "
 238                   << result;
 239   }
 240
 241   return MIDIPortInfo(id, manufacturer, name, version);
 242 }
 243
 244 // static
 245 double MIDIManagerMac::MIDITimeStampToSeconds(MIDITimeStamp timestamp) {
 246   UInt64 nanoseconds = AudioConvertHostTimeToNanos(timestamp);
 247   return static_cast<double>(nanoseconds) / 1.0e9;
 248 }
 249
 250 // static
 251 MIDITimeStamp MIDIManagerMac::SecondsToMIDITimeStamp(double seconds) {
 252   UInt64 nanos = UInt64(seconds * 1.0e9);
 253   return AudioConvertNanosToHostTime(nanos);
 254 }
 255
 256 }  // namespace media