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SoundPlayer: Implement playlist shuffle mode

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The shuffling algorithm uses a naïve bloom filter to provide random
uniformity, avoiding items that were recently played.  With 32 bits,
double hashing, and an error rate of ~10%, this bloom filter should
be able to hold around ~16 keys, which should be sufficient to give the
illusion of fairness to the shuffling algorithm.

This avoids having to shuffle the playlist itself (user might have
spent quite a bit of time to sort them, so it's not a good idea to mess
with it), or having to create a proxy model that shuffles (that could
potentially use quite a bit of memory).
This commit is contained in:
Leandro Pereira 2021-09-30 07:41:00 -07:00 • committed by Andreas Kling
parent 0812965f50
commit 314b8a374b
7 changed files with 106 additions and 11 deletions
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23
Userland/Applications/SoundPlayer/Player.h
View file

@ -24,6 +24,10 @@ public:
File,
Playlist,
};
enum class ShuffleMode {
None,
Shuffling,
};
explicit Player(Audio::ClientConnection& audio_client_connection);
virtual ~Player() { }
@ -34,10 +38,13 @@ public:
StringView loaded_filename() const { return m_loaded_filename; }
PlayState play_state() const { return m_play_state; }
void set_play_state(PlayState state);
void set_play_state(PlayState);
LoopMode loop_mode() const { return m_loop_mode; }
void set_loop_mode(LoopMode mode);
void set_loop_mode(LoopMode);
ShuffleMode shuffle_mode() const { return m_shuffle_mode; }
void set_shuffle_mode(ShuffleMode);
double volume() const { return m_volume; }
void set_volume(double value);
@ -52,11 +59,12 @@ public:
virtual void loop_mode_changed(LoopMode) = 0;
virtual void time_elapsed(int) = 0;
virtual void file_name_changed(StringView) = 0;
virtual void playlist_loaded(StringView, bool) { }
virtual void audio_load_error(StringView, StringView) { }
virtual void volume_changed(double) { }
virtual void total_samples_changed(int) { }
virtual void sound_buffer_played(RefPtr<Audio::Buffer>, [[maybe_unused]] int sample_rate, [[maybe_unused]] int samples_played) { }
virtual void playlist_loaded(StringView, bool) = 0;
virtual void audio_load_error(StringView, StringView) = 0;
virtual void shuffle_mode_changed(ShuffleMode) = 0;
virtual void volume_changed(double) = 0;
virtual void total_samples_changed(int) = 0;
virtual void sound_buffer_played(RefPtr<Audio::Buffer>, [[maybe_unused]] int sample_rate, [[maybe_unused]] int samples_played) = 0;
protected:
void done_initializing()
@ -71,6 +79,7 @@ private:
Playlist m_playlist;
PlayState m_play_state;
LoopMode m_loop_mode;
ShuffleMode m_shuffle_mode;
Audio::ClientConnection& m_audio_client_connection;
PlaybackManager m_playback_manager;