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93 lines
3.1 KiB
C++
93 lines
3.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021-2023, kleines Filmröllchen <filmroellchen@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 "ClientAudioStream.h"
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#include "ConnectionFromClient.h"
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#include "FadingProperty.h"
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#include <AK/Atomic.h>
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#include <AK/Badge.h>
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#include <AK/ByteBuffer.h>
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#include <AK/Debug.h>
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#include <AK/Queue.h>
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#include <AK/RefCounted.h>
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#include <AK/WeakPtr.h>
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#include <LibAudio/Queue.h>
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#include <LibAudio/Resampler.h>
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#include <LibCore/ConfigFile.h>
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#include <LibCore/File.h>
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#include <LibCore/Timer.h>
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#include <LibThreading/ConditionVariable.h>
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#include <LibThreading/Mutex.h>
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#include <LibThreading/Thread.h>
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namespace AudioServer {
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// Headroom, i.e. fixed attenuation for all audio streams.
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// This is to prevent clipping when two streams with low headroom (e.g. normalized & compressed) are playing.
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constexpr double SAMPLE_HEADROOM = 0.95;
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// The size of the buffer in samples that the hardware receives through write() calls to the audio device.
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constexpr size_t HARDWARE_BUFFER_SIZE = 512;
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// The hardware buffer size in bytes; there's two channels of 16-bit samples.
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constexpr size_t HARDWARE_BUFFER_SIZE_BYTES = HARDWARE_BUFFER_SIZE * 2 * sizeof(i16);
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class Mixer : public Core::EventReceiver {
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C_OBJECT_ABSTRACT(Mixer)
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public:
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static ErrorOr<NonnullRefPtr<Mixer>> try_create(NonnullRefPtr<Core::ConfigFile> config)
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{
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// FIXME: Allow AudioServer to use other audio channels as well
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auto device = TRY(Core::File::open("/dev/audio/0"sv, Core::File::OpenMode::Write));
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return adopt_nonnull_ref_or_enomem(new (nothrow) Mixer(move(config), move(device)));
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}
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virtual ~Mixer() override = default;
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NonnullRefPtr<ClientAudioStream> create_queue(ConnectionFromClient&);
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// To the outside world, we pretend that the target volume is already reached, even though it may be still fading.
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double main_volume() const { return m_main_volume.target(); }
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void set_main_volume(double volume);
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bool is_muted() const { return m_muted; }
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void set_muted(bool);
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int audiodevice_set_sample_rate(u32 sample_rate);
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u32 audiodevice_get_sample_rate() const;
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private:
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Mixer(NonnullRefPtr<Core::ConfigFile> config, NonnullOwnPtr<Core::File> device);
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void request_setting_sync();
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Vector<NonnullRefPtr<ClientAudioStream>> m_pending_mixing;
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Threading::Mutex m_pending_mutex;
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Threading::ConditionVariable m_mixing_necessary { m_pending_mutex };
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NonnullOwnPtr<Core::File> m_device;
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mutable Optional<u32> m_cached_sample_rate {};
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NonnullRefPtr<Threading::Thread> m_sound_thread;
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bool m_muted { false };
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FadingProperty<double> m_main_volume { 1 };
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NonnullRefPtr<Core::ConfigFile> m_config;
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RefPtr<Core::Timer> m_config_write_timer;
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Array<u8, HARDWARE_BUFFER_SIZE_BYTES> m_stream_buffer;
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Array<u8, HARDWARE_BUFFER_SIZE_BYTES> const m_zero_filled_buffer {};
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void mix();
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};
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// Interval in ms when the server tries to save its configuration to disk.
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constexpr unsigned AUDIO_CONFIG_WRITE_INTERVAL = 2000;
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}
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