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| 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 <iostream> | |
| 8 #include <string> | |
| 9 | |
| 10 #include "base/debug/trace_event.h" | |
| 11 #include "base/strings/string_number_conversions.h" | |
| 12 #include "base/strings/sys_string_conversions.h" | |
| 13 #include <CoreAudio/HostTime.h> | |
| 14 | |
| 15 using base::IntToString; | |
| 16 using base::SysCFStringRefToUTF8; | |
| 17 using std::string; | |
| 18 | |
| 19 namespace media { | |
| 20 | |
| 21 MIDIManager* MIDIManager::Create() { | |
| 22 return new MIDIManagerMac(); | |
| 23 } | |
| 24 | |
| 25 MIDIManagerMac::MIDIManagerMac() | |
| 26 : midi_client_(NULL), | |
| 27 coremidi_input_(NULL), | |
| 28 coremidi_output_(NULL), | |
| 29 packet_list_(NULL), | |
| 30 midi_packet_(NULL) { | |
| 31 } | |
| 32 | |
| 33 bool MIDIManagerMac::Initialize() { | |
| 34 TRACE_EVENT0("midi", "MIDIManagerMac::Initialize"); | |
| 35 | |
| 36 // CoreMIDI registration. | |
| 37 midi_client_ = NULL; | |
| 38 OSStatus result = MIDIClientCreate( | |
| 39 CFSTR("Google Chrome"), | |
| 40 NULL, | |
| 41 NULL, | |
| 42 &midi_client_); | |
| 43 | |
| 44 if (result != noErr) | |
| 45 return false; | |
| 46 | |
| 47 coremidi_input_ = NULL; | |
| 48 | |
| 49 // Create input and output port. | |
| 50 result = MIDIInputPortCreate( | |
| 51 midi_client_, | |
| 52 CFSTR("MIDI Input"), | |
| 53 ReadMidiDispatch, | |
| 54 this, | |
| 55 &coremidi_input_); | |
| 56 if (result != noErr) | |
| 57 return false; | |
| 58 | |
| 59 result = MIDIOutputPortCreate( | |
| 60 midi_client_, | |
| 61 CFSTR("MIDI Output"), | |
| 62 &coremidi_output_); | |
| 63 if (result != noErr) | |
| 64 return false; | |
| 65 | |
| 66 int destination_count = MIDIGetNumberOfDestinations(); | |
| 67 destinations_.reserve(destination_count); | |
| 68 | |
| 69 for (int i = 0; i < destination_count ; i++) { | |
| 70 MIDIEndpointRef destination = MIDIGetDestination(i); | |
| 71 | |
| 72 // Keep track of all destinations (known as outputs by the Web MIDI API). | |
| 73 // Cache to avoid any possible overhead in calling MIDIGetDestination(). | |
| 74 destinations_[i] = destination; | |
| 75 | |
| 76 MIDIPortInfo info = GetPortInfoFromEndpoint(destination); | |
| 77 AddOutputPort(info); | |
| 78 } | |
| 79 | |
| 80 // Open connections from all sources. | |
| 81 int source_count = MIDIGetNumberOfSources(); | |
| 82 | |
| 83 for (int i = 0; i < source_count; ++i) { | |
| 84 // Receive from all sources. | |
| 85 MIDIEndpointRef src = MIDIGetSource(i); | |
| 86 MIDIPortConnectSource(coremidi_input_, src, src); | |
| 87 | |
| 88 // Keep track of all sources (known as inputs in Web MIDI API terminology). | |
| 89 source_map_[src] = i; | |
| 90 | |
| 91 MIDIPortInfo info = GetPortInfoFromEndpoint(src); | |
| 92 AddInputPort(info); | |
| 93 } | |
| 94 | |
| 95 // TODO(crogers): Fix the memory management here! | |
| 96 packet_list_ = reinterpret_cast<MIDIPacketList*>(midi_buffer_); | |
| 97 midi_packet_ = MIDIPacketListInit(packet_list_); | |
| 98 | |
| 99 return true; | |
| 100 } | |
| 101 | |
| 102 MIDIManagerMac::~MIDIManagerMac() { | |
| 103 if (coremidi_input_) | |
| 104 MIDIPortDispose(coremidi_input_); | |
| 105 if (coremidi_output_) | |
| 106 MIDIPortDispose(coremidi_output_); | |
| 107 } | |
| 108 | |
| 109 void MIDIManagerMac::ReadMidiDispatch(const MIDIPacketList* packet_list, | |
| 110 void* read_proc_refcon, | |
| 111 void* src_conn_refcon) { | |
| 112 MIDIManagerMac* manager = static_cast<MIDIManagerMac*>(read_proc_refcon); | |
| 113 MIDIEndpointRef source = static_cast<MIDIEndpointRef>(src_conn_refcon); | |
| 114 | |
| 115 // Dispatch to class method. | |
| 116 manager->ReadMidi(source, packet_list); | |
| 117 } | |
| 118 | |
| 119 void MIDIManagerMac::ReadMidi(MIDIEndpointRef source, | |
| 120 const MIDIPacketList* packet_list) { | |
| 121 // Lookup the port index based on the source. | |
| 122 SourceMap::iterator j = source_map_.find(source); | |
| 123 if (j == source_map_.end()) | |
| 124 return; | |
| 125 int port_index = source_map_[source]; | |
| 126 | |
| 127 // Go through each packet and process separately. | |
| 128 for(size_t i = 0; i < packet_list->numPackets; i++) { | |
| 129 // Each packet contains MIDI data for one or more messages (like note-on). | |
| 130 const MIDIPacket &packet = packet_list->packet[i]; | |
| 131 double timestamp_seconds = MIDITimeStampToSeconds(packet.timeStamp); | |
| 132 | |
| 133 ReceiveMIDIData( | |
| 134 port_index, | |
| 135 packet.data, | |
| 136 packet.length, | |
| 137 timestamp_seconds); | |
| 138 } | |
| 139 } | |
| 140 | |
| 141 void MIDIManagerMac::SendMIDIData(int port_index, | |
| 142 const uint8* data, | |
| 143 size_t length, | |
| 144 double timestamp) { | |
| 145 // TODO(crogers): Filter out sysex. | |
| 146 | |
| 147 MIDITimeStamp coremidi_timestamp = SecondsToMIDITimeStamp(timestamp); | |
| 148 | |
| 149 midi_packet_ = MIDIPacketListAdd( | |
| 150 packet_list_, | |
| 151 kMaxPacketListSize, | |
| 152 midi_packet_, | |
| 153 coremidi_timestamp, | |
| 154 length, | |
| 155 data); | |
| 156 | |
| 157 // Lookup the destination based on the port index. | |
| 158 // TODO(crogers): re-factor |port_index| to use unsigned | |
| 159 // to avoid the need for this check. | |
| 160 if (port_index < 0 || | |
| 161 static_cast<size_t>(port_index) >= destinations_.size()) | |
| 162 return; | |
| 163 | |
| 164 MIDIEndpointRef destination = destinations_[port_index]; | |
| 165 | |
| 166 MIDISend(coremidi_output_, destination, packet_list_); | |
| 167 | |
| 168 // Re-initialize for next time. | |
| 169 midi_packet_ = MIDIPacketListInit(packet_list_); | |
| 170 } | |
| 171 | |
| 172 MIDIPortInfo MIDIManagerMac::GetPortInfoFromEndpoint( | |
| 173 MIDIEndpointRef endpoint) { | |
| 174 SInt32 id_number = 0; | |
| 175 MIDIObjectGetIntegerProperty(endpoint, kMIDIPropertyUniqueID, &id_number); | |
| 176 string id = IntToString(id_number); | |
| 177 | |
| 178 CFStringRef manufacturer_ref = NULL; | |
| 179 MIDIObjectGetStringProperty( | |
| 180 endpoint, kMIDIPropertyManufacturer, &manufacturer_ref); | |
| 181 string manufacturer = SysCFStringRefToUTF8(manufacturer_ref); | |
| 182 | |
| 183 CFStringRef name_ref = NULL; | |
| 184 MIDIObjectGetStringProperty(endpoint, kMIDIPropertyName, &name_ref); | |
| 185 string name = SysCFStringRefToUTF8(name_ref); | |
| 186 | |
| 187 SInt32 version_number = 0; | |
| 188 MIDIObjectGetIntegerProperty( | |
| 189 endpoint, kMIDIPropertyDriverVersion, &version_number); | |
| 190 string version = IntToString(version_number); | |
| 191 | |
| 192 return MIDIPortInfo(id, manufacturer, name, version); | |
| 193 } | |
| 194 | |
| 195 double MIDIManagerMac::MIDITimeStampToSeconds(MIDITimeStamp timestamp) { | |
| 196 UInt64 nanoseconds = AudioConvertHostTimeToNanos(timestamp); | |
| 197 return static_cast<double>(nanoseconds) / 1.0e9; | |
| 198 } | |
| 199 | |
| 200 MIDITimeStamp MIDIManagerMac::SecondsToMIDITimeStamp(double seconds) { | |
| 201 UInt64 nanos = UInt64(seconds * 1.0e9); | |
| 202 return AudioConvertNanosToHostTime(nanos); | |
| 203 } | |
| 204 | |
| 205 } // namespace media | |
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Chromium Code Reviews
Issue 17334006:
Revert 207983 "Implement Web MIDI API back-end" (Closed)
Base URL: svn://svn.chromium.org/chrome/