Simple DFPWM player for CC.

dfpwm.lua

-- Simple DFPWM player for CC:T
-- https://gist.github.com/Cheatoid/e798988c54b411e9d1b64e7aa7057d91
local dfpwm = require("cc.audio.dfpwm")
local CHUNK_SIZE = 16 * 1024
local unpack = unpack or table.unpack
--- Play DFPWM audio from a file or URL
---@param path string Path (or direct URL) of the file to play
---@param speakers? table (Optional) List of speaker peripherals to play audio to
local function play_dfpwm(path, speakers)
  assert(type(path) == "string", "bad argument #1 (string expected, got " .. type(path) .. ")")
  assert(#path > 0, "path argument is empty")
  speakers = speakers or { peripheral.find("speaker") }
  assert(#speakers > 0, "speaker peripheral is missing")
  local decoder = dfpwm.make_decoder()
  local function playBuffer(buffer)
    local players = {}
    for i, speaker in next, speakers do
      players[i] = function()
        while not speaker.playAudio(buffer) do
          os.pullEvent("speaker_audio_empty")
        end
      end
    end
    parallel.waitForAll(unpack(players))
  end
  if path:lower():match("^https?:") then
    assert(http and http.get, "http extension is disabled")
    local request = assert(http.get(path, nil, true))
    path = assert(request.readAll(), "failed to read response")
    request.close()
    for i = 1, #path, CHUNK_SIZE do
      playBuffer(decoder(path:sub(i, i + CHUNK_SIZE - 1)))
    end
  else
    assert(fs.exists(path), "file path does not exist")
    for chunk in io.lines(path, CHUNK_SIZE) do
      playBuffer(decoder(chunk))
    end
  end
end
local arg = ...
if arg then
  play_dfpwm(arg)
end
return play_dfpwm