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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qffmpegaudioinput_p.h"
#include <qiodevice.h>
#include <qaudiosource.h>
#include <qaudiobuffer.h>
#include <qatomic.h>
#include <qdebug.h>
QT_BEGIN_NAMESPACE
namespace QFFmpeg {
class AudioSourceIO : public QIODevice
{
Q_OBJECT
public:
AudioSourceIO(QFFmpegAudioInput *audioInput) : QIODevice(), m_input(audioInput)
{
m_muted = m_input->muted;
m_volume = m_input->volume;
updateVolume();
open(QIODevice::WriteOnly);
}
~AudioSourceIO() override = default;
void setDevice(const QAudioDevice &device)
{
QMutexLocker locker(&m_mutex);
if (m_device == device)
return;
m_device = device;
QMetaObject::invokeMethod(this, "updateSource");
}
void setFrameSize(int frameSize)
{
m_bufferSize.storeRelease((frameSize > 0 && m_format.isValid())
? m_format.bytesForFrames(frameSize)
: DefaultAudioInputBufferSize);
}
void setRunning(bool r) {
QMutexLocker locker(&m_mutex);
if (m_running == r)
return;
m_running = r;
QMetaObject::invokeMethod(this, "updateRunning");
}
void setVolume(float vol) {
QMutexLocker locker(&m_mutex);
m_volume = vol;
QMetaObject::invokeMethod(this, "updateVolume");
}
void setMuted(bool muted) {
QMutexLocker locker(&m_mutex);
m_muted = muted;
QMetaObject::invokeMethod(this, "updateVolume");
}
int bufferSize() const { return m_bufferSize.loadAcquire(); }
protected:
qint64 readData(char *, qint64) override
{
return 0;
}
qint64 writeData(const char *data, qint64 len) override
{
int l = len;
while (len > 0) {
const auto bufferSize = m_bufferSize.loadAcquire();
int toAppend = qMin(len, bufferSize - m_pcm.size());
m_pcm.append(data, toAppend);
data += toAppend;
len -= toAppend;
if (m_pcm.size() == bufferSize)
sendBuffer();
}
return l;
}
private Q_SLOTS:
void updateSource() {
QMutexLocker locker(&m_mutex);
m_format = m_device.preferredFormat();
if (std::exchange(m_src, nullptr))
m_pcm.clear();
m_src = std::make_unique<QAudioSource>(m_device, m_format);
updateVolume();
if (m_running)
m_src->start(this);
}
void updateVolume()
{
if (m_src)
m_src->setVolume(m_muted ? 0. : m_volume);
}
void updateRunning()
{
QMutexLocker locker(&m_mutex);
if (m_running) {
if (!m_src)
updateSource();
m_src->start(this);
} else {
m_src->stop();
}
}
private:
void sendBuffer()
{
QAudioFormat fmt = m_src->format();
qint64 time = fmt.durationForBytes(m_processed);
QAudioBuffer buffer(m_pcm, fmt, time);
emit m_input->newAudioBuffer(buffer);
m_processed += m_pcm.size();
m_pcm.clear();
}
QMutex m_mutex;
QAudioDevice m_device;
float m_volume = 1.;
bool m_muted = false;
bool m_running = false;
QFFmpegAudioInput *m_input = nullptr;
std::unique_ptr<QAudioSource> m_src;
QAudioFormat m_format;
QAtomicInt m_bufferSize = DefaultAudioInputBufferSize;
qint64 m_processed = 0;
QByteArray m_pcm;
};
}
QFFmpegAudioInput::QFFmpegAudioInput(QAudioInput *qq)
: QPlatformAudioInput(qq)
{
qRegisterMetaType<QAudioBuffer>();
inputThread = std::make_unique<QThread>();
audioIO = new QFFmpeg::AudioSourceIO(this);
audioIO->moveToThread(inputThread.get());
inputThread->start();
}
QFFmpegAudioInput::~QFFmpegAudioInput()
{
// Ensure that COM is uninitialized by nested QWindowsResampler
// on the same thread that initialized it.
audioIO->deleteLater();
inputThread->exit();
inputThread->wait();
}
void QFFmpegAudioInput::setAudioDevice(const QAudioDevice &device)
{
audioIO->setDevice(device);
}
void QFFmpegAudioInput::setMuted(bool muted)
{
audioIO->setMuted(muted);
}
void QFFmpegAudioInput::setVolume(float volume)
{
audioIO->setVolume(volume);
}
void QFFmpegAudioInput::setFrameSize(int s)
{
audioIO->setFrameSize(s);
}
void QFFmpegAudioInput::setRunning(bool b)
{
audioIO->setRunning(b);
}
int QFFmpegAudioInput::bufferSize() const
{
return audioIO->bufferSize();
}
QT_END_NAMESPACE
#include "moc_qffmpegaudioinput_p.cpp"
#include "qffmpegaudioinput.moc"
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