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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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8
Userland/Applications/SoundPlayer/main.cpp
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@ -98,6 +98,14 @@ int main(int argc, char** argv)
playlist_toggle->set_checked(true);
playback_menu.add_action(playlist_toggle);
auto shuffle_mode = GUI::Action::create_checkable("S&huffle Playlist", [&](auto& action) {
if (action.is_checked())
player->set_shuffle_mode(Player::ShuffleMode::Shuffling);
else
player->set_shuffle_mode(Player::ShuffleMode::None);
});
playback_menu.add_action(shuffle_mode);
auto& visualization_menu = window->add_menu("&Visualization");
GUI::ActionGroup visualization_actions;
visualization_actions.set_exclusive(true);