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playback.lua
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playback.lua
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PlaybackHandler = {
sources = {},
muted = {
pulse2 = false,
pulse1 = false,
tri = false,
noise = false
},
solo = {
pulse2 = false,
pulse1 = false,
tri = false,
noise = false
},
volumes = {
pulse2 = 0.6,
pulse1 = 0.6,
tri = 1,
noise = 1
},
playing = false,
-- these are in ticks: ticks relative to the start of the current pattern
playpos = 0,
-- ticks relative to the start of the whole song
songpos = 0,
-- this is a position which can be set upon clicking on a point in the editors
setsongpos = 0,
setplaypos = 0,
setPattern = 0,
playingPattern = 0,
-- the sounds that play when placing down notes
preview_playing = false,
previewtick = 0,
previewpitch = 0,
}
function PlaybackHandler:initSources()
local p2 = love.audio.newSource( "assets/square.wav", "static" ); p2:setLooping(true);
self.sources["pulse2"] = p2;
local p1 = love.audio.newSource( "assets/square.wav", "static" ); p1:setLooping(true);
self.sources["pulse1"] = p1;
local tri = love.audio.newSource( "assets/tri.wav", "static" ); tri:setLooping(true);
self.sources["tri"] = tri;
-- noise sources
self.sources["kick"] = love.audio.newSource("assets/kick.wav", "static");
self.sources["ch"] = love.audio.newSource("assets/ch.wav", "static");
self.sources["oh"] = love.audio.newSource("assets/oh.wav", "static");
end
-- toggles between playing and stopping based on the current status
function PlaybackHandler:togglePlaying()
local ptrn = songs[selectedSong].patterns[self.setPattern];
if not ptrn then return end
self.playing = not self.playing;
self.playpos = self.setplaypos; self.songpos = self.setsongpos;
self.playingPattern = self.setPattern;
if (not self.playing) then self:stop(); end
end
function PlaybackHandler:toggleMute(channel)
self.muted[channel] = not self.muted[channel];
if self.muted[channel] then
-- without a specific note we dont know what source noise is
if channel == "noise" then
self.sources["kick"]:stop();
self.sources[ "ch" ]:stop();
self.sources[ "oh" ]:stop();
else
self.sources[channel]:stop();
end
-- cant be soloed and muted at the same time
self.solo[channel] = false;
else
for key, value in pairs(self.muted) do
self.solo[key] = false;
end
end
end
function PlaybackHandler:toggleSolo(channel)
self.solo[channel] = not self.solo[channel];
self.muted[channel] = false;
if self.solo[channel] then
for key, value in pairs(self.muted) do
if key ~= channel then
self.muted[key] = true;
self.solo[key] = false;
if key == "noise" then
self.sources["kick"]:stop();
self.sources[ "ch" ]:stop();
self.sources[ "oh" ]:stop();
else
self.sources[key]:stop();
end
end
end
else
for key, value in pairs(self.muted) do
self.muted[key] = false;
end
end
end
-- returns an audio source given a channel and noteval (the noteval is used to decide the sources for noise)
function PlaybackHandler:getSource(channel, noteval)
-- todo (this is probably bitmasked in some way)
if channel == "noise" then
if noteval == 0x10 then -- closed hat
return self.sources["ch"];
elseif noteval == 0x20 then -- kick
return self.sources["kick"];
elseif noteval == 0x30 then -- open hat
return self.sources["oh"];
else
return false;
end
else
return self.sources[channel];
end
end
-- called every tick, updates the playback of the song if it is currently ongoing
function PlaybackHandler:update()
if self.preview_playing then self:updatePreview() end
if not self.playing then return end
local ptrn = songs[selectedSong].patterns[self.playingPattern];
if not ptrn then return end
self:updateChannel("pulse2");
self:updateChannel("pulse1");
self:updateChannel("tri");
self:updateChannel("noise");
if (self.playpos >= ptrn.duration - 1) then
if songs[selectedSong].loop then
-- This will step through every subsequent pattern until it finds one with greater than zero duration
-- If it reaches the end of the song, it will loop back to the beginning (hence the modulo)
local next_nonzero_ptrn;
for i = 0, 0xff do
self.playingPattern = ( self.playingPattern + 1 ) % ( songs[selectedSong].patternCount );
next_nonzero_ptrn = songs[selectedSong].patterns[self.playingPattern];
if next_nonzero_ptrn.duration > 0 then
break;
end
end
-- Minus one because it will be stepped back up to zero at the end of this function
self.playpos = -1;
self.songpos = next_nonzero_ptrn.starttime - 1;
else
self:stop();
end
end
self.playpos = self.playpos + 1;
self.songpos = self.songpos + 1;
end
-- initialises the preview
function PlaybackHandler:playPreview(val)
-- TODO make sources accessible from table of keys
local source = self:getSource(selectedChannel, val)
if not source then return end
if selectedChannel ~= "noise" then
local freq = FREQ_TABLE[ val ];
if not freq then source:stop(); return end
if (selectedChannel == "tri") then
freq = freq / 2;
end
source:setPitch( freq / 130.8128 ); -- <- the frequency of the square wave sample im using right now
end
source:play();
self.preview_playing = true; self.previewtick = 20;
self.previewpitch = val;
end
function PlaybackHandler:updatePreview()
if self.previewtick <= 1 then
local source = self:getSource(selectedChannel, self.previewpitch)
if not source then return end
source:stop(); self.preview_playing = false;
end
self.previewtick = self.previewtick - 1;
end
function PlaybackHandler:updateChannel( chnl )
if self.muted[chnl] then return end
local ptrn = songs[selectedSong].patterns[self.playingPattern];
if not ptrn then return end
local notes = ptrn:getNotes(chnl);
if not notes[0] then return end
for i = 0, #notes do
local note = notes[i];
local pos = self.playpos;
-- noise playback loops if shorter than the main pattern duration
if chnl == "noise" and ptrn.noiseduration < ptrn.duration then
pos = pos % ptrn.noiseduration;
end
if note.starttime == pos then
local source = self:getSource(chnl, note.val);
if not source then return end
-- rest
if ( note.val == 04) then
source:stop();
--source:setVolume(0); -- <- this doesnt really have a smooth cutoff, it ramps down weirdly
return;
-- note
else
source:setVolume( self.volumes[ chnl ] );
-- Noise can't be repitched like the other channels
if chnl ~= "noise" then
local freq = FREQ_TABLE[ note.val ];
if not freq then source:stop(); return end
if (chnl == "tri") then
freq = freq / 2;
end
source:setPitch( freq / 130.8128 ); -- <- the frequency of the square wave sample im using right now
end
source:play();
end
end
end
end
function PlaybackHandler:stop()
for key, value in pairs(self.sources) do
self.sources[key]:stop();
end
self.playing = false;
end
function PlaybackHandler:reset()
self.playpos = 0; self.songpos = 0;
self.setsongpos = 0;
self.setplaypos = 0;
self.setPattern = 0;
self.playingPattern = 0;
end