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
media / audio / win / audio_session_event_listener_win.h [blame]
// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_AUDIO_WIN_AUDIO_SESSION_EVENT_LISTENER_WIN_H_
#define MEDIA_AUDIO_WIN_AUDIO_SESSION_EVENT_LISTENER_WIN_H_
#include <audiopolicy.h>
#include <wrl/client.h>
#include <wrl/implements.h>
#include "base/functional/callback.h"
#include "media/base/media_export.h"
namespace media {
class MEDIA_EXPORT AudioSessionEventListener
: public Microsoft::WRL::RuntimeClass<
Microsoft::WRL::RuntimeClassFlags<Microsoft::WRL::ClassicCom>,
IAudioSessionEvents> {
public:
// Handles event callbacks from
// IAudioSessionControl::RegisterAudioSessionNotification(). Runs
// |device_change_cb| when OnSessionDisconnected() is called.
//
// Since the IAudioClient session is dead after the disconnection, we use a
// OnceCallback. The delivery of this notification is fatal to the |client|.
AudioSessionEventListener(base::OnceClosure device_change_cb);
~AudioSessionEventListener() override;
private:
friend class AudioSessionEventListenerTest;
// IAudioSessionEvents implementation.
IFACEMETHODIMP OnChannelVolumeChanged(DWORD channel_count,
float new_channel_volume_array[],
DWORD changed_channel,
LPCGUID event_context) override;
IFACEMETHODIMP OnDisplayNameChanged(LPCWSTR new_display_name,
LPCGUID event_context) override;
IFACEMETHODIMP OnGroupingParamChanged(LPCGUID new_grouping_param,
LPCGUID event_context) override;
IFACEMETHODIMP OnIconPathChanged(LPCWSTR new_icon_path,
LPCGUID event_context) override;
IFACEMETHODIMP OnSessionDisconnected(
AudioSessionDisconnectReason disconnect_reason) override;
IFACEMETHODIMP OnSimpleVolumeChanged(float new_volume,
BOOL new_mute,
LPCGUID event_context) override;
IFACEMETHODIMP OnStateChanged(AudioSessionState new_state) override;
base::OnceClosure device_change_cb_;
};
} // namespace media
#endif // MEDIA_AUDIO_WIN_AUDIO_SESSION_EVENT_LISTENER_WIN_H_