peripheral.find("modem", rednet.open)
local dfpwm = require("cc.audio.dfpwm")
local speaker = peripheral.find("speaker")

local decoder = dfpwm.make_decoder()

string.startswith = function(self, str)
    return self:find('^' .. str) ~= nil
end

while true do
    id, message = rednet.receive()

    if message:startswith("play_song") then

        for chunk in io.lines(string.sub(message, 10, string.len(message)) .. ".dfpwm", 16 * 1024) do
            local buffer = decoder(chunk)

            while not speaker.playAudio(buffer) do
                os.pullEvent("speaker_audio_empty")
            end

        end
    end
end