class FdkAacEncoder < Formula
  desc "Command-line encoder frontend for libfdk-aac"
  homepage "https://github.com/nu774/fdkaac"
  url "https://github.com/nu774/fdkaac/archive/v0.6.2.tar.gz"
  sha256 "de758d6e651e81e9be89d2972612fc5b96cb70321234c3339f35483b636458ad"

  bottle do
    cellar :any
    sha256 "e0a16df6937c67fdbe68a326ba1bcdebfe0ede86f60b98be9645cfe49c0d9adb" => :yosemite
    sha256 "7fa6eec6baaf3f62860ccec0a6c27557d8fc9674d2ab9408a8b6159be2101819" => :mavericks
    sha256 "5ff4e41972f3b9f9424e49541616f8bda05ccc3b5f707c8be068c60d5bdee725" => :mountain_lion
  end

  depends_on "autoconf" => :build
  depends_on "automake" => :build
  depends_on "libtool" => :build
  depends_on "pkg-config" => :build
  depends_on "fdk-aac"

  def install
    system "autoreconf", "-i"
    system "./configure", "--disable-debug",
                          "--disable-dependency-tracking",
                          "--disable-silent-rules",
                          "--prefix=#{prefix}",
                          "--mandir=#{man}"
    system "make", "install"
  end

  test do
    # generate test tone pcm file
    sample_rate = 44100
    two_pi = 2 * Math::PI

    num_samples = sample_rate
    frequency = 440.0
    max_amplitude = 0.2

    position_in_period = 0.0
    position_in_period_delta = frequency / sample_rate

    samples = [].fill(0.0, 0, num_samples)

    num_samples.times do |i|
      samples[i] = Math.sin(position_in_period * two_pi) * max_amplitude

      position_in_period += position_in_period_delta

      if position_in_period >= 1.0
        position_in_period -= 1.0
      end
    end

    samples.map! do |sample|
      (sample * 32767.0).round
    end

    File.open("#{testpath}/tone.pcm", "wb") do |f|
      f.syswrite(samples.flatten.pack("s*"))
    end

    system "#{bin}/fdkaac", "-R", "--raw-channels", "1", "-m",
           "1", "#{testpath}/tone.pcm", "--title", "Test Tone"
  end
end