10 changed files with 96 additions and 940 deletions
--- a/.gitignore
+++ b/.gitignore
@ -20,5 +20,5 @@ erl_crash.dump
 *.ez
 # Ignore package tarball (built via "mix hex.build").
-midi_player-*.tar
+midi_tools-*.tar
--- a/674
+++ b/674
@ -1,674 +0,0 @@
                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007
 Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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            How to Apply These Terms to Your New Programs
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 Also add information on how to contact you by electronic and paper mail.
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 The hypothetical commands `show w' and `show c' should show the appropriate
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 if any, to sign a "copyright disclaimer" for the program, if necessary.
 For more information on this, and how to apply and follow the GNU GPL, see
 <https://www.gnu.org/licenses/>.
  The GNU General Public License does not permit incorporating your program
 into proprietary programs.  If your program is a subroutine library, you
 may consider it more useful to permit linking proprietary applications with
 the library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.  But first, please read
 <https://www.gnu.org/licenses/why-not-lgpl.html>.
--- a/README.md
+++ b/README.md
@ -1,74 +1,21 @@
-# MIDIPlayer
+# MIDITools
-A MIDI player for Elixir.
+**TODO: Add description**
-## Prerequisites
+## Installation
-Install FluidSynth to play MIDI commands:
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
-
+by adding `midi_tools` to your list of dependencies in `mix.exs`:
 On Linux:
 ```sh
 sudo apt install libfluidsynth-dev
 ```
 On OSX:
 ```sh
 brew install fluidsynth
 ```
 Clone this repo or put the [Hex dependency](https://hex.pm/packages/midi_player) in your mix.exs:
 ```elixir
-{:midi_player, "~> 0.2.0"}
+def deps do
  [
    {:midi_tools, "~> 0.1.0"}
  ]
 end
 ```
-## Examples
+Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
 and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
 be found at [https://hexdocs.pm/midi_tools](https://hexdocs.pm/midi_tools).
 MIDIPlayer takes "events" which for example represent to play a note for a time span.
 It then converts these events to MIDI commands and schedules them.
 First, let's create some events.
 This plays a piano sound for the C note for 1 second:
 ```elixir
 iex> piano = MIDIPlayer.Event.note(0, 60, 0, 1000, 127)
 ```
 We can change the instrument to a violin after one second like so:
 ```elixir
 iex> change = MIDIPlayer.Event.change_program(0, 1000, 41)
 ```
 (Note that it could be simpler to use another MIDI channel for another instrument.)
 Finally, play two notes on the violin at the same time:
 ```elixir
 iex> violin1 = MIDIPlayer.Event.note(0, 67, 1000, 3000, 127)
 iex> violin2 = MIDIPlayer.Event.note(0, 64, 1000, 3000, 127)
 ```
 Now we are ready to play these events.
 First start the player like so:
 ```elixir
 iex> {:ok, player} = MIDIPlayer.start_link()
 ```
 Then load the events, and play them!
 ```elixir
 iex> MIDIPlayer.generate_schedule(player, [piano, change, violin1, violin2], 3000)
 iex> MIDIPlayer.play(player)
 ```
 ## Thanks
 This project uses [MIDISynth](https://github.com/fhunleth/midi_synth)
 for generating MIDI commands and operating the FluidSynth synthesizer.
 It also uses [Timex](https://github.com/bitwalker/timex)
 for timing related functionality.
 Inspiration from [Beats](https://github.com/mtrudel/beats).
--- a/lib/midi_tools.ex
+++ b/lib/midi_tools.ex
@ -0,0 +1,18 @@
 defmodule MIDITools do
  @moduledoc """
  Documentation for `MIDITools`.
  """
  @doc """
  Hello world.
  ## Examples
      iex> MIDITools.hello()
      :world
  """
  def hello do
    :world
  end
 end
--- a/lib/midi_player/event.ex
+++ b/lib/midi_player/event.ex
@ -1,7 +1,6 @@
-defmodule MIDIPlayer.Event do
+defmodule MIDITools.Event do
  @moduledoc """
  Several musical events which can be converted to MIDI commands.
  All timings are in milliseconds.
  """
@ -11,6 +10,17 @@ defmodule MIDIPlayer.Event do
    """
    defstruct channel: 0, tone: 0, start_time: 0, end_time: 0, velocity: 0
    @spec new(MIDISynth.Command.channel(), non_neg_integer(), non_neg_integer(), non_neg_integer(), MIDISynth.Command.velocity()) :: %Note{}
    def new(channel, tone, start_time, end_time, velocity) when start_time >= 0 and end_time > start_time do
      %__MODULE__{
        channel: channel,
        tone: tone,
        start_time: start_time,
        end_time: end_time,
        velocity: velocity
      }
    end
  end
  defmodule ChangeProgram do
@ -19,6 +29,11 @@ defmodule MIDIPlayer.Event do
    """
    defstruct channel: 0, time: 0, program: 0
    @spec new(MIDISynth.Command.channel(), non_neg_integer(), non_neg_integer()) :: %ChangeProgram{}
    def new(channel, time, program) do
      %__MODULE__{channel: channel, time: time, program: program}
    end
  end
  @typedoc """
@ -26,30 +41,6 @@ defmodule MIDIPlayer.Event do
  """
  @type t :: %Note{} | %ChangeProgram{}
  @spec note(
          MIDISynth.Command.channel(),
          non_neg_integer(),
          non_neg_integer(),
          non_neg_integer(),
          MIDISynth.Command.velocity()
        ) :: %Note{}
  def note(channel, tone, start_time, end_time, velocity)
      when start_time >= 0 and end_time > start_time do
    %Note{
      channel: channel,
      tone: tone,
      start_time: start_time,
      end_time: end_time,
      velocity: velocity
    }
  end
  @spec change_program(MIDISynth.Command.channel(), non_neg_integer(), non_neg_integer()) ::
          %ChangeProgram{}
  def change_program(channel, time, program) do
    %ChangeProgram{channel: channel, time: time, program: program}
  end
  @doc """
  Converts the event to a list of MIDI commands.
  """
--- a/lib/midi_tools/player.ex
+++ b/lib/midi_tools/player.ex
@ -1,29 +1,18 @@
-defmodule MIDIPlayer do
+defmodule MIDITools.Player do
  use GenServer
  @moduledoc """
  A GenServer for playing a schedule of MIDI commands at predefined times.
  """
  # TBD: I think cancelling the timer could introduce a race condition.
  # Could maybe match timer's reference to saved one?
  @type schedule :: [{non_neg_integer(), binary()}]
  # Client API
  @midi_synth_args [:soundfont]
  @doc """
  Start the MIDI player.
  The soundfont path can be set with the :soundfont argument.
  """
-  @spec start_link(GenServer.options()) :: GenServer.on_start()
+  @spec start_link() :: GenServer.on_start()
-  def start_link(opts \\ []) do
+  def start_link do
-    init_args = Keyword.take(opts, @midi_synth_args)
+    GenServer.start_link(__MODULE__, nil, name: __MODULE__)
    server_args = Keyword.drop(opts, @midi_synth_args)
    GenServer.start_link(__MODULE__, init_args, server_args)
  end
  @doc """
@ -35,72 +24,58 @@ defmodule MIDIPlayer do
  The duration makes sure the player plays a (potential) pause after the last
  midi command.
-  See `MIDIPlayer.Event` to create events.
+  See `MIDITools.Event` to create events.
  """
-  @spec generate_schedule(GenServer.server(), [MIDIPlayer.Event.t()], non_neg_integer()) :: :ok
+  @spec generate_schedule([MIDITools.Event.t()], non_neg_integer()) :: :ok
-  def generate_schedule(player, events, duration) when duration > 0 do
+  def generate_schedule(events, duration) when duration > 0 do
-    GenServer.call(player, {:generate_schedule, events, duration})
+    GenServer.call(__MODULE__, {:generate_schedule, events, duration})
  end
  @doc """
  Play the current MIDI schedule from the start.
  """
-  @spec play(GenServer.server()) :: :ok
+  @spec play() :: :ok
-  def play(player) do
+  def play do
-    GenServer.call(player, :play)
+    GenServer.call(__MODULE__, :play)
  end
  @doc """
  Set the player on repeat or not.
  """
-  @spec set_repeat(GenServer.server(), boolean()) :: :ok
+  @spec set_repeat(boolean()) :: :ok
-  def set_repeat(player, repeat) when is_boolean(repeat) do
+  def set_repeat(repeat) when is_boolean(repeat) do
-    GenServer.call(player, {:set_repeat, repeat})
+    GenServer.call(__MODULE__, {:set_repeat, repeat})
  end
  @doc """
  Stop the player and cancel the pause.
  """
-  @spec stop_playing(GenServer.server()) :: :ok
+  @spec stop_playing() :: :ok
-  def stop_playing(player) do
+  def stop_playing do
-    GenServer.call(player, :stop_playing)
+    GenServer.call(__MODULE__, :stop_playing)
  end
  @doc """
-  Pause the player.
+  Pause the player. See `MIDITools.Player.resume/0` for resuming playback.
  See `MIDIPlayer.resume/1` for resuming playback.
  """
-  @spec pause(GenServer.server()) :: :ok | {:error, :already_paused | :not_started}
+  @spec pause() :: :ok | {:error, :already_paused | :not_started}
-  def pause(player) do
+  def pause do
-    GenServer.call(player, :pause)
+    GenServer.call(__MODULE__, :pause)
  end
  @doc """
  Resume playback on the player after it has been paused.
  """
-  @spec resume(GenServer.server()) :: :ok | {:error, :not_paused}
+  @spec resume() :: :ok, {:error, :not_paused}
-  def resume(player) do
+  def resume do
-    GenServer.call(player, :resume)
+    GenServer.call(__MODULE__, :resume)
  end
  @doc """
  Get the current schedule of the player.
  The schedule is a list of tuples of a time in milliseconds and the
  corresponding bitstream of MIDI commands to be played at that time.
  The list is guaranteed to be ascending in time.
  """
  @spec get_schedule(GenServer.server()) :: schedule()
  def get_schedule(player) do
    GenServer.call(player, :get_schedule)
  end
  # Server callbacks
  @impl GenServer
-  def init(args) do
+  def init(_arg) do
-    {:ok, synth} = MIDISynth.start_link(args)
+    {:ok, synth} = MIDISynth.start_link([])
    {:ok,
     %{
@ -125,14 +100,15 @@ defmodule MIDIPlayer do
    start_time = Timex.now()
    timer = start_timer(schedule, start_time)
-    {:reply, :ok, %{reset(state) | timer: timer, start_time: start_time}}
+    {:reply, :ok,
     %{reset(state) | timer: timer, start_time: start_time}}
  end
  def handle_call({:set_repeat, repeat}, _from, state) do
    {:reply, :ok, %{state | repeat: repeat}}
  end
-  def handle_call(:stop_playing, _from, state) do
+  def handle_call(:stop_playing, _from,  state) do
    {:reply, :ok, reset(state)}
  end
@ -167,10 +143,6 @@ defmodule MIDIPlayer do
    {:reply, :ok, %{state | timer: timer, start_time: start_time, pause_time: nil}}
  end
  def handle_call(:get_schedule, _from, %{schedule: schedule} = state) do
    {:reply, schedule, state}
  end
  @impl GenServer
  def handle_info(
        :play,
@ -238,7 +210,7 @@ defmodule MIDIPlayer do
  defp convert_events(events) do
    events
-    |> Enum.flat_map(&MIDIPlayer.Event.convert/1)
+    |> Enum.flat_map(&MIDITools.Event.convert/1)
    |> Enum.reduce(%{}, fn {time, midi}, acc ->
      Map.update(acc, time, midi, &<<&1::binary, midi::binary>>)
    end)
--- a/mix.exs
+++ b/mix.exs
@ -1,26 +1,21 @@
-defmodule MIDIPlayer.MixProject do
+defmodule MIDITools.MixProject do
  use Mix.Project
  def project do
    [
-      app: :midi_player,
+      app: :midi_tools,
-      version: "0.2.0",
+      version: "0.1.0",
      elixir: "~> 1.10",
      start_permanent: Mix.env() == :prod,
      deps: deps(),
      # Docs
-      name: "MIDIPlayer",
+      name: "MIDITools",
-      source_url: "https://github.com/pizzapim/midi_player",
+      source_url: "https://github.com/pizzapim/midi_tools",
-      homepage_url: "https://github.com/pizzapim/midi_player",
+      homepage_url: "https://github.com/pizzapim/midi_tools",
      docs: [
-        extras: ["README.md"],
+        main: "MIDITools"
-        main: "readme"
+      ]
      ],
      # Hex stuff
      description: description(),
      package: package()
    ]
  end
@ -30,26 +25,11 @@ defmodule MIDIPlayer.MixProject do
    ]
  end
  defp description do
    """
    A MIDI player for Elixir.
    MIDIPlayer takes musical "events" like playing a note, converts them to MIDI commands, schedules them and then lets you play them.
    """
  end
  defp package do
    [
      name: "midi_player",
      licenses: ["GPL-3.0-or-later"],
      links: %{"GitHub" => "https://github.com/pizzapim/midi_player"}
    ]
  end
  defp deps do
    [
      {:midi_synth, "~> 0.4.0"},
      {:timex, "~> 3.6"},
-      {:ex_doc, "~> 0.22", only: :dev, runtime: false}
+      {:ex_doc, "~> 0.22", only: :dev, runtime: false},
    ]
  end
 end
--- a/test/event_test.exs
+++ b/test/event_test.exs
@ -1,27 +0,0 @@
 defmodule MIDIPlayer.EventTest do
  use ExUnit.Case
  doctest MIDIPlayer.Event
  alias MIDIPlayer.Event
  test "note event" do
    assert %Event.Note{channel: 0, tone: 60, start_time: 1, end_time: 1000, velocity: 127} =
             Event.note(0, 60, 1, 1000, 127)
  end
  test "change program event" do
    assert %Event.ChangeProgram{channel: 0, time: 1, program: 40} = Event.change_program(0, 1, 40)
  end
  test "note event conversion" do
    note = Event.note(0, 60, 1, 1000, 127)
    [note_on, note_off] = Event.convert(note)
    assert {1, <<0x90, 60, 127>>} = note_on
    assert {1000, <<0x80, 60, 64>>} = note_off
  end
  test "change program event conversion" do
    change_program = Event.change_program(0, 1, 40)
    assert [{1, <<0xC0, 40>>}] = Event.convert(change_program)
  end
 end
--- a/test/midi_tools_test.exs
+++ b/test/midi_tools_test.exs
@ -0,0 +1,8 @@
 defmodule MIDIToolsTest do
  use ExUnit.Case
  doctest MIDITools
  test "greets the world" do
    assert MIDITools.hello() == :world
  end
 end
--- a/test/player_test.exs
+++ b/test/player_test.exs
@ -1,59 +0,0 @@
 defmodule MIDIPlayerTest do
  use ExUnit.Case
  doctest MIDIPlayer
  alias MIDIPlayer, as: Player
  alias MIDIPlayer.Event
  setup do
    {:ok, player} = Player.start_link([])
    [player: player]
  end
  setup_all do
    events = Enum.map(1..4, &Event.note(9, 51, &1 * 500, (&1 + 1) * 500, 127))
    duration = 2000
    [events: events, duration: duration]
  end
  test "play", %{player: player, events: events, duration: duration} do
    assert :ok = Player.generate_schedule(player, events, duration)
    assert :ok = Player.play(player)
    Process.sleep(2500)
  end
  test "pause & resume", %{player: player, events: events, duration: duration} do
    Player.generate_schedule(player, events, duration)
    Player.play(player)
    Process.sleep(1100)
    assert :ok = Player.pause(player)
    Process.sleep(500)
    assert :ok = Player.resume(player)
    Process.sleep(1400)
  end
  test "pause & resume edge cases", %{player: player, events: events, duration: duration} do
    Player.generate_schedule(player, events, duration)
    assert {:error, :not_started} = Player.pause(player)
    assert {:error, :not_paused} = Player.resume(player)
    Player.play(player)
    Player.pause(player)
    assert {:error, :already_paused} = Player.pause(player)
  end
  test "event conversion", %{player: player} do
    event1 = Event.change_program(0, 1, 40)
    event2 = Event.note(0, 60, 1, 1000, 127)
    events = [event1, event2]
    duration = 100
    assert :ok = Player.generate_schedule(player, events, duration)
    change_program = MIDISynth.Command.change_program(0, 40)
    note_on = MIDISynth.Command.note_on(0, 60, 127)
    note_off = MIDISynth.Command.note_off(0, 60)
    [command1, command2] = Player.get_schedule(player)
    assert {1, <<^change_program::binary-size(2), ^note_on::binary-size(3)>>} = command1
    assert {1000, ^note_off} = command2
  end
 end