require 'fileutils'

##
# This script downloads and builds MPlayer, replacing the included FFmpeg
# backend with the FFmpeg-MT branch that provides multi-core decoding. This
# should really give those with multiple cores/processors a hand in utilizing
# true-highdef content, such as 1080p Matroska movies encoded in H.264.
# 
# I pull specific revisions of FFmpeg-MT and MPlayer that I know to build
# together, feel free to expieriment with newer revisions - no guarantee
# that'll work though!

FFmpegRepo = 'git://gitorious.org/ffmpeg/ffmpeg-mt.git'
FFmpegDirectory = 'ffmpeg-mt'
FFmpegStableCommit = 'e340cacc56545c5fc3a903c68fec99e8921d579e' # 'babb66241ae51e2956aa698d425c645ad056936e'
MPlayerRepo = 'svn://svn.mplayerhq.hu/mplayer/trunk'
MPlayerDirectory = 'mplayer'
MPlayerStableRevision = 27902 # 27799

desc 'Clone FFmpeg'
task :ffmpeg, :commit do |_, params|
  commit = params[:commit] || FFmpegStableCommit
  puts "** Cloning FFmpeg, and switching to commit #{commit}"
  system "git clone #{FFmpegRepo} #{FFmpegDirectory}"
  FileUtils.cd FFmpegDirectory, :verbose => true do
    system "git checkout #{commit}"
  end
end

desc 'Checkout MPlayer'
task :mplayer, :revision do |_, params|
  revision = params[:revision] || MPlayerStableRevision
  puts "** Checking out MPlayer at revision #{revision}"
  system "svn checkout #{MPlayerRepo}@#{revision} #{MPlayerDirectory}"
  FileUtils.cd MPlayerDirectory, :verbose => true do
    system "svn revert -R *"
  end
end

desc 'Copy libraries from FFmpeg to MPlayer'
task :mux => [:mplayer, :ffmpeg] do
  Dir[ File.join(FFmpegDirectory, 'libav*') ].each do |libav_dir|
    libav_dir = libav_dir.split(File::Separator).last
    FileUtils.rm_rf File.join(MPlayerDirectory, libav_dir), :verbose => true
    FileUtils.cp_r  File.join(FFmpegDirectory,  libav_dir),
                    File.join(MPlayerDirectory, libav_dir), :verbose => true
  end
end

desc 'Apply the patch to MPlayer'
task :apply => :mplayer do
  puts "** Applying the patch"
  FileUtils.cd MPlayerDirectory, :verbose => true do
    system 'patch -up0 -i ../mplayer-mt.diff'
  end
end

desc 'Build MPlayer'
task :build do
  puts "** Building MPlayer"
  FileUtils.cd MPlayerDirectory, :verbose => true do
    system './configure'
    system 'make'
  end
end

desc 'Install MPlayer'
task :install => :build do
  puts "** Installing MPlayer"
  FileUtils.cd MPlayerDirectory, :verbose => true do
    system 'make install' # you probably need to run this as root
  end
end

task :default => [:mux, :install]