mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-11 13:36:13 +03:00
This implementation detail of audio support in ladybird is a QObject that needs moc'd by the moc tools. Putting it in its own file follows the pattern we have for all the other QObjects in Ladybird.
104 lines
2.7 KiB
C++
104 lines
2.7 KiB
C++
/*
|
|
* Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
|
|
* Copyright (c) 2023, Andrew Kaster <akaster@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Endian.h>
|
|
#include <AK/MemoryStream.h>
|
|
#include <AK/Optional.h>
|
|
#include <AK/Types.h>
|
|
#include <LibAudio/Loader.h>
|
|
#include <LibAudio/Sample.h>
|
|
#include <LibCore/SharedCircularQueue.h>
|
|
#include <QAudioFormat>
|
|
#include <QAudioSink>
|
|
#include <QByteArray>
|
|
#include <QMediaDevices>
|
|
#include <QThread>
|
|
|
|
namespace Ladybird {
|
|
|
|
static constexpr u32 UPDATE_RATE_MS = 10;
|
|
|
|
struct AudioTask {
|
|
enum class Type {
|
|
Stop,
|
|
Play,
|
|
Pause,
|
|
Seek,
|
|
Volume,
|
|
RecreateAudioDevice,
|
|
};
|
|
|
|
Type type;
|
|
Optional<double> data {};
|
|
};
|
|
|
|
using AudioTaskQueue = Core::SharedSingleProducerCircularQueue<AudioTask>;
|
|
|
|
class AudioThread final : public QThread { // We have to use QThread, otherwise internal Qt media QTimer objects do not work.
|
|
Q_OBJECT
|
|
|
|
public:
|
|
static ErrorOr<NonnullOwnPtr<AudioThread>> create(NonnullRefPtr<Audio::Loader> loader);
|
|
|
|
ErrorOr<void> stop();
|
|
|
|
Duration duration() const { return m_duration; }
|
|
|
|
ErrorOr<void> queue_task(AudioTask task);
|
|
|
|
Q_SIGNALS:
|
|
void playback_position_updated(Duration);
|
|
|
|
private:
|
|
AudioThread(NonnullRefPtr<Audio::Loader> loader, AudioTaskQueue task_queue);
|
|
|
|
enum class Paused {
|
|
Yes,
|
|
No,
|
|
};
|
|
|
|
void run() override;
|
|
|
|
ErrorOr<Paused> play_next_samples(QAudioSink& audio_output, QIODevice& io_device);
|
|
|
|
void enqueue_samples(QAudioSink const& audio_output, QIODevice& io_device, FixedArray<Audio::Sample> samples);
|
|
|
|
template<typename T>
|
|
void write_sample(FixedMemoryStream& stream, float sample)
|
|
{
|
|
// The values that need to be written to the stream vary depending on the output channel format, and isn't
|
|
// particularly well documented. The value derivations performed below were adapted from a Qt example:
|
|
// https://code.qt.io/cgit/qt/qtmultimedia.git/tree/examples/multimedia/audiooutput/audiooutput.cpp?h=6.4.2#n46
|
|
LittleEndian<T> pcm;
|
|
|
|
if constexpr (IsSame<T, u8>)
|
|
pcm = static_cast<u8>((sample + 1.0f) / 2 * NumericLimits<u8>::max());
|
|
else if constexpr (IsSame<T, i16>)
|
|
pcm = static_cast<i16>(sample * NumericLimits<i16>::max());
|
|
else if constexpr (IsSame<T, i32>)
|
|
pcm = static_cast<i32>(sample * NumericLimits<i32>::max());
|
|
else if constexpr (IsSame<T, float>)
|
|
pcm = sample;
|
|
else
|
|
static_assert(DependentFalse<T>);
|
|
|
|
MUST(stream.write_value(pcm));
|
|
}
|
|
|
|
NonnullRefPtr<Audio::Loader> m_loader;
|
|
AudioTaskQueue m_task_queue;
|
|
|
|
QByteArray m_sample_buffer;
|
|
|
|
Duration m_duration;
|
|
Duration m_position;
|
|
};
|
|
|
|
}
|