1// Copyright (C) 2022 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#include "qaudiosystem_p.h"
5
6#include <QtCore/qdebug.h>
7#include <QtMultimedia/qaudiosink.h>
8#include <QtMultimedia/qaudiosource.h>
9#include <QtMultimedia/private/qplatformaudiodevices_p.h>
10
11QT_BEGIN_NAMESPACE
12
13QPlatformAudioEndpointBase::QPlatformAudioEndpointBase(QAudioDevice device,
14 const QAudioFormat &format, QObject *parent)
15 : QObject{ parent }, m_audioDevice{ std::move(device) }, m_format{ format }
16{
17 Q_ASSERT(parent && "QPlatformAudioEndpointBase requires the QAudioSink/QAudioSource as parent");
18}
19
20void QPlatformAudioEndpointBase::setError(QAudio::Error err)
21{
22 if (err == m_error)
23 return;
24 m_error = err;
25}
26
27bool QPlatformAudioEndpointBase::isFormatSupported(const QAudioFormat &format) const
28{
29 return m_audioDevice.isFormatSupported(format);
30}
31
32void QPlatformAudioEndpointBase::updateStreamState(QAudio::State state)
33{
34 if (m_streamState == state)
35 return;
36
37 m_streamState = state;
38 inferState();
39}
40
41void QPlatformAudioEndpointBase::updateStreamIdle(bool idle, EmitStateSignal emitStateSignal)
42{
43 if (idle == m_streamIsIdle)
44 return;
45 m_streamIsIdle = idle;
46
47 if (emitStateSignal == EmitStateSignal::True)
48 inferState();
49}
50
51void QPlatformAudioEndpointBase::inferState()
52{
53 // The "state" is derived from two sources:
54 // * the m_streamState, as changed by start/stop/suspend/resume
55 // * the "idle" state of the stream, as detected by the ringbuffer level
56 //
57 // we combine these two sources to infer a user-visible "state"
58 using State = QtAudio::State;
59
60 State oldState = m_inferredState;
61
62 switch (m_streamState) {
63 case State::StoppedState:
64 m_inferredState = State::StoppedState;
65 break;
66 case State::SuspendedState:
67 m_inferredState = State::SuspendedState;
68 break;
69 case State::ActiveState:
70 m_inferredState = m_streamIsIdle ? State::IdleState : State::ActiveState;
71 break;
72
73 case State::IdleState:
74 qCritical() << "Users should not be able to set the state to Idle!";
75 Q_UNREACHABLE_RETURN();
76 }
77
78 if (oldState != m_inferredState)
79 emit stateChanged(m_inferredState);
80}
81
82QPlatformAudioSink::QPlatformAudioSink(QAudioDevice device, const QAudioFormat &format,
83 QObject *parent)
84 : QPlatformAudioEndpointBase(std::move(device), format, parent)
85{
86}
87
88QPlatformAudioSink *QPlatformAudioSink::get(const QAudioSink &sink)
89{
90 return sink.d;
91}
92
93QPlatformAudioSource::QPlatformAudioSource(QAudioDevice device, const QAudioFormat &format,
94 QObject *parent)
95 : QPlatformAudioEndpointBase(std::move(device), format, parent)
96{
97}
98
99QPlatformAudioSource *QPlatformAudioSource::get(const QAudioSource &source)
100{
101 return source.d;
102}
103
104QT_END_NAMESPACE
105
106#include "moc_qaudiosystem_p.cpp"
107

source code of qtmultimedia/src/multimedia/audio/qaudiosystem.cpp