blob: bc6fd39b58649dd8ea388b8c10396b4ab01111f1 (
plain)
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
|
// 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.
#ifndef CONTENT_BROWSER_MEDIA_MIDI_HOST_H_
#define CONTENT_BROWSER_MEDIA_MIDI_HOST_H_
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <vector>
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_vector.h"
#include "base/synchronization/lock.h"
#include "content/common/content_export.h"
#include "content/public/browser/browser_message_filter.h"
#include "content/public/browser/browser_thread.h"
#include "media/midi/midi_manager.h"
#include "media/midi/midi_port_info.h"
#include "media/midi/midi_service.mojom.h"
namespace midi {
class MidiService;
class MidiMessageQueue;
} // namespace midi
namespace content {
class CONTENT_EXPORT MidiHost : public BrowserMessageFilter,
public midi::MidiManagerClient {
public:
// Called from UI thread from the owner of this object.
MidiHost(int renderer_process_id, midi::MidiService* midi_service);
// BrowserMessageFilter implementation.
void OnChannelClosing() override;
void OnDestruct() const override;
bool OnMessageReceived(const IPC::Message& message) override;
// MidiManagerClient implementation.
void CompleteStartSession(midi::mojom::Result result) override;
void AddInputPort(const midi::MidiPortInfo& info) override;
void AddOutputPort(const midi::MidiPortInfo& info) override;
void SetInputPortState(uint32_t port, midi::mojom::PortState state) override;
void SetOutputPortState(uint32_t port, midi::mojom::PortState state) override;
void ReceiveMidiData(uint32_t port,
const uint8_t* data,
size_t length,
double timestamp) override;
void AccumulateMidiBytesSent(size_t n) override;
void Detach() override;
// Start session to access MIDI hardware.
void OnStartSession();
// Data to be sent to a MIDI output port.
void OnSendData(uint32_t port,
const std::vector<uint8_t>& data,
double timestamp);
void OnEndSession();
protected:
~MidiHost() override;
private:
friend class base::DeleteHelper<MidiHost>;
friend class BrowserThread;
int renderer_process_id_;
// Represents if the renderer has a permission to send/receive MIDI SysEX
// messages.
bool has_sys_ex_permission_;
// Represents if a session is requested to start.
bool is_session_requested_;
// |midi_service_| manages a MidiManager instance that talks to
// platform-specific MIDI APIs. It can be nullptr after detached.
midi::MidiService* midi_service_;
// Buffers where data sent from each MIDI input port is stored.
ScopedVector<midi::MidiMessageQueue> received_messages_queues_;
// Protects access to |received_messages_queues_|;
base::Lock messages_queues_lock_;
// The number of bytes sent to the platform-specific MIDI sending
// system, but not yet completed.
size_t sent_bytes_in_flight_;
// The number of bytes successfully sent since the last time
// we've acknowledged back to the renderer.
size_t bytes_sent_since_last_acknowledgement_;
// Protects access to |sent_bytes_in_flight_|.
base::Lock in_flight_lock_;
// How many output port exists.
uint32_t output_port_count_;
// Protects access to |output_port_count_|.
base::Lock output_port_count_lock_;
DISALLOW_COPY_AND_ASSIGN(MidiHost);
};
} // namespace content
#endif // CONTENT_BROWSER_MEDIA_MIDI_HOST_H_
|
