1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
// Copyright 2014 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_alsa.h"
#include <alsa/asoundlib.h>
#include "base/bind.h"
#include "base/debug/trace_event.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/message_loop/message_loop.h"
#include "base/strings/stringprintf.h"
#include "base/threading/thread.h"
#include "media/midi/midi_port_info.h"
namespace media {
class MidiManagerAlsa::MidiDeviceInfo
: public base::RefCounted<MidiDeviceInfo> {
public:
MidiDeviceInfo(MidiManagerAlsa* manager,
const std::string& bus_id,
snd_ctl_card_info_t* card,
const snd_rawmidi_info_t* midi,
int device) {
opened_ = !snd_rawmidi_open(&midi_in_, &midi_out_, bus_id.c_str(), 0);
if (!opened_)
return;
const std::string id = base::StringPrintf("%s:%d", bus_id.c_str(), device);
const std::string name = snd_rawmidi_info_get_name(midi);
// We assume that card longname is in the format of
// "<manufacturer> <name> at <bus>". Otherwise, we give up to detect
// a manufacturer name here.
std::string manufacturer;
const std::string card_name = snd_ctl_card_info_get_longname(card);
size_t name_index = card_name.find(name);
if (std::string::npos != name_index)
manufacturer = card_name.substr(0, name_index - 1);
const std::string version =
base::StringPrintf("%s / ALSA library version %d.%d.%d",
snd_ctl_card_info_get_driver(card),
SND_LIB_MAJOR, SND_LIB_MINOR, SND_LIB_SUBMINOR);
port_info_ = MidiPortInfo(id, manufacturer, name, version);
}
void Send(MidiManagerClient* client, const std::vector<uint8>& data) {
ssize_t result = snd_rawmidi_write(
midi_out_, reinterpret_cast<const void*>(&data[0]), data.size());
if (static_cast<size_t>(result) != data.size()) {
// TODO(toyoshim): Disconnect and reopen the device.
LOG(ERROR) << "snd_rawmidi_write fails: " << strerror(-result);
}
base::MessageLoop::current()->PostTask(
FROM_HERE,
base::Bind(&MidiManagerClient::AccumulateMidiBytesSent,
base::Unretained(client), data.size()));
}
const MidiPortInfo& GetMidiPortInfo() const { return port_info_; }
bool IsOpened() const { return opened_; }
private:
friend class base::RefCounted<MidiDeviceInfo>;
virtual ~MidiDeviceInfo() {
if (opened_) {
snd_rawmidi_close(midi_in_);
snd_rawmidi_close(midi_out_);
}
}
bool opened_;
MidiPortInfo port_info_;
snd_rawmidi_t* midi_in_;
snd_rawmidi_t* midi_out_;
DISALLOW_COPY_AND_ASSIGN(MidiDeviceInfo);
};
MidiManagerAlsa::MidiManagerAlsa()
: send_thread_("MidiSendThread") {
}
bool MidiManagerAlsa::Initialize() {
// TODO(toyoshim): Make Initialize() asynchronous.
// See http://crbug.com/339746.
TRACE_EVENT0("midi", "MidiManagerMac::Initialize");
// Enumerate only hardware MIDI devices because software MIDIs running in
// the browser process is not secure.
snd_ctl_card_info_t* card;
snd_rawmidi_info_t* midi_out;
snd_rawmidi_info_t* midi_in;
snd_ctl_card_info_alloca(&card);
snd_rawmidi_info_alloca(&midi_out);
snd_rawmidi_info_alloca(&midi_in);
for (int index = -1; !snd_card_next(&index) && index >= 0; ) {
const std::string id = base::StringPrintf("hw:CARD=%i", index);
snd_ctl_t* handle;
int err = snd_ctl_open(&handle, id.c_str(), 0);
if (err != 0) {
DLOG(ERROR) << "snd_ctl_open fails: " << snd_strerror(err);
continue;
}
err = snd_ctl_card_info(handle, card);
if (err != 0) {
DLOG(ERROR) << "snd_ctl_card_info fails: " << snd_strerror(err);
snd_ctl_close(handle);
continue;
}
for (int device = -1;
!snd_ctl_rawmidi_next_device(handle, &device) && device >= 0; ) {
bool output;
bool input;
snd_rawmidi_info_set_device(midi_out, device);
snd_rawmidi_info_set_subdevice(midi_out, 0);
snd_rawmidi_info_set_stream(midi_out, SND_RAWMIDI_STREAM_OUTPUT);
output = snd_ctl_rawmidi_info(handle, midi_out) == 0;
snd_rawmidi_info_set_device(midi_in, device);
snd_rawmidi_info_set_subdevice(midi_in, 0);
snd_rawmidi_info_set_stream(midi_in, SND_RAWMIDI_STREAM_INPUT);
input = snd_ctl_rawmidi_info(handle, midi_in) == 0;
if (!output && !input)
continue;
scoped_refptr<MidiDeviceInfo> port = new MidiDeviceInfo(
this, id, card, output ? midi_out : midi_in, device);
if (!port->IsOpened()) {
DLOG(ERROR) << "MidiDeviceInfo open fails";
continue;
}
if (input) {
in_devices_.push_back(port);
AddInputPort(port->GetMidiPortInfo());
}
if (output) {
out_devices_.push_back(port);
AddOutputPort(port->GetMidiPortInfo());
}
}
snd_ctl_close(handle);
}
return true;
}
MidiManagerAlsa::~MidiManagerAlsa() {
send_thread_.Stop();
}
void MidiManagerAlsa::DispatchSendMidiData(MidiManagerClient* client,
uint32 port_index,
const std::vector<uint8>& data,
double timestamp) {
if (out_devices_.size() <= port_index)
return;
base::TimeDelta delay;
if (timestamp != 0.0) {
base::TimeTicks time_to_send =
base::TimeTicks() + base::TimeDelta::FromMicroseconds(
timestamp * base::Time::kMicrosecondsPerSecond);
delay = std::max(time_to_send - base::TimeTicks::Now(), base::TimeDelta());
}
if (!send_thread_.IsRunning())
send_thread_.Start();
scoped_refptr<MidiDeviceInfo> device = out_devices_[port_index];
send_thread_.message_loop()->PostDelayedTask(
FROM_HERE,
base::Bind(&MidiDeviceInfo::Send, device, client, data),
delay);
}
MidiManager* MidiManager::Create() {
return new MidiManagerAlsa();
}
} // namespace media
|
