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Audio: Change how volume works

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Across the entire audio system, audio now works in 0-1 terms instead of
0-100 as before. Therefore, volume is now a double instead of an int.
The master volume of the AudioServer changes smoothly through a
FadingProperty, preventing clicks. Finally, volume computations are done
with logarithmic scaling, which is more natural for the human ear.

Note that this could be 4-5 different commits, but as they change each
other's code all the time, it makes no sense to split them up.
This commit is contained in:
kleines Filmröllchen 2021-08-27 23:47:09 +02:00 • committed by Andreas Kling
parent 2909c3a931
commit 152ec28da0
14 changed files with 190 additions and 45 deletions
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18
Userland/Services/AudioServer/Mixer.h
View file

@ -8,6 +8,7 @@
#pragma once
#include "ClientConnection.h"
#include "FadingProperty.h"
#include <AK/Atomic.h>
#include <AK/Badge.h>
#include <AK/ByteBuffer.h>
@ -23,6 +24,10 @@
namespace AudioServer {
// Headroom, i.e. fixed attenuation for all audio streams.
// This is to prevent clipping when two streams with low headroom (e.g. normalized & compressed) are playing.
constexpr double SAMPLE_HEADROOM = 0.7;
class ClientConnection;
class BufferQueue : public RefCounted<BufferQueue> {
@ -82,6 +87,10 @@ public:
return -1;
}
FadingProperty<double>& volume() { return m_volume; }
double volume() const { return m_volume; }
void set_volume(double const volume) { m_volume = volume; }
private:
RefPtr<Audio::Buffer> m_current;
Queue<NonnullRefPtr<Audio::Buffer>> m_queue;
@ -89,7 +98,9 @@ private:
int m_remaining_samples { 0 };
int m_played_samples { 0 };
bool m_paused { false };
WeakPtr<ClientConnection> m_client;
FadingProperty<double> m_volume { 1 };
};
class Mixer : public Core::Object {
@ -100,8 +111,9 @@ public:
NonnullRefPtr<BufferQueue> create_queue(ClientConnection&);
int main_volume() const { return m_main_volume; }
void set_main_volume(int volume);
// To the outside world, we pretend that the target volume is already reached, even though it may be still fading.
double main_volume() const { return m_main_volume.target(); }
void set_main_volume(double volume);
bool is_muted() const { return m_muted; }
void set_muted(bool);
@ -122,7 +134,7 @@ private:
NonnullRefPtr<Threading::Thread> m_sound_thread;
bool m_muted { false };
int m_main_volume { 100 };
FadingProperty<double> m_main_volume { 1 };
NonnullRefPtr<Core::ConfigFile> m_config;
RefPtr<Core::Timer> m_config_write_timer;