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https://github.com/SerenityOS/serenity
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2a4f2110b9
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++
/*
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* Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
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* Copyright (c) 2023, Andrew Kaster <akaster@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Endian.h>
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#include <AK/MemoryStream.h>
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#include <AK/Optional.h>
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#include <AK/Types.h>
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#include <LibAudio/Loader.h>
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#include <LibAudio/Sample.h>
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#include <LibCore/SharedCircularQueue.h>
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#include <QAudioFormat>
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#include <QAudioSink>
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#include <QByteArray>
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#include <QMediaDevices>
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#include <QThread>
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namespace Ladybird {
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static constexpr u32 UPDATE_RATE_MS = 10;
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struct AudioTask {
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enum class Type {
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Stop,
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Play,
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Pause,
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Seek,
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Volume,
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RecreateAudioDevice,
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};
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Type type;
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Optional<double> data {};
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};
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using AudioTaskQueue = Core::SharedSingleProducerCircularQueue<AudioTask>;
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class AudioThread final : public QThread { // We have to use QThread, otherwise internal Qt media QTimer objects do not work.
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Q_OBJECT
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public:
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static ErrorOr<NonnullOwnPtr<AudioThread>> create(NonnullRefPtr<Audio::Loader> loader);
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ErrorOr<void> stop();
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Duration duration() const { return m_duration; }
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ErrorOr<void> queue_task(AudioTask task);
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Q_SIGNALS:
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void playback_position_updated(Duration);
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private:
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AudioThread(NonnullRefPtr<Audio::Loader> loader, AudioTaskQueue task_queue);
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enum class Paused {
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Yes,
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No,
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};
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void run() override;
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ErrorOr<Paused> play_next_samples(QAudioSink& audio_output, QIODevice& io_device);
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void enqueue_samples(QAudioSink const& audio_output, QIODevice& io_device, FixedArray<Audio::Sample> samples);
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template<typename T>
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void write_sample(FixedMemoryStream& stream, float sample)
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{
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// The values that need to be written to the stream vary depending on the output channel format, and isn't
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// particularly well documented. The value derivations performed below were adapted from a Qt example:
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// https://code.qt.io/cgit/qt/qtmultimedia.git/tree/examples/multimedia/audiooutput/audiooutput.cpp?h=6.4.2#n46
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LittleEndian<T> pcm;
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if constexpr (IsSame<T, u8>)
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pcm = static_cast<u8>((sample + 1.0f) / 2 * NumericLimits<u8>::max());
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else if constexpr (IsSame<T, i16>)
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pcm = static_cast<i16>(sample * NumericLimits<i16>::max());
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else if constexpr (IsSame<T, i32>)
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pcm = static_cast<i32>(sample * NumericLimits<i32>::max());
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else if constexpr (IsSame<T, float>)
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pcm = sample;
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else
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static_assert(DependentFalse<T>);
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MUST(stream.write_value(pcm));
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}
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NonnullRefPtr<Audio::Loader> m_loader;
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AudioTaskQueue m_task_queue;
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QByteArray m_sample_buffer;
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Duration m_duration;
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Duration m_position;
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};
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}
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