class Transcode < XMorph::Base

  PRO_1080_16_TRACKS = "1080_16"
  PRO_1080_14_TRACKS = "1080_14"
  PRO_1080_8_TRACKS = "1080_8"
  PRO_1080_2_TRACKS = "1080_2"
  PRO_1080_STEREO = "1080_stereo"
  PRO_720_STEREO = "720_stereo"

  def set_profiles
    self.profiles = {
      PRO_1080_16_TRACKS => "ffmpeg -y -i %{IN} -vf \"fps=25.000000,scale=1920x1080\" -filter_complex \"[0:a:8][0:a:9]amerge=inputs=2[aout0]\" -pix_fmt yuv420p  -vcodec h264 -g 13 -bf 2 -x264opts nal-hrd=cbr -profile:v high -flags +ilme+ildct -top 1 -vb 10000000 -minrate:v 10000000 -maxrate:v 10000000 -bufsize:v 20000000 -acodec libfdk_aac -profile:a aac_low -ab 192k -map 0:v -map \"[aout0]\"  -muxrate 11211200  -streamid 0:2064  -streamid 1:2068 %{OUT} 2>&1",
      PRO_1080_14_TRACKS => "ffmpeg -y -i %{IN} -vf \"fps=25.000000,scale=1920x1080\" -filter_complex \"[0:a:6][0:a:7]amerge=inputs=2[aout0]\" -pix_fmt yuv420p  -vcodec h264 -g 13 -bf 2 -x264opts nal-hrd=cbr -profile:v high -flags +ilme+ildct -top 1 -vb 10000000 -minrate:v 10000000 -maxrate:v 10000000 -bufsize:v 20000000 -acodec libfdk_aac -profile:a aac_low -ab 192k -map 0:v -map \"[aout0]\"  -muxrate 11211200  -streamid 0:2064  -streamid 1:2068 %{OUT} 2>&1",
      PRO_1080_8_TRACKS =>  "ffmpeg -y -i %{IN} -vf \"fps=25.000000,scale=1920x1080\" -filter_complex \"[0:a:6][0:a:7]amerge=inputs=2[aout0]\" -pix_fmt yuv420p  -vcodec h264 -g 13 -bf 2 -x264opts nal-hrd=cbr -profile:v high -flags +ilme+ildct -top 1 -vb 10000000 -minrate:v 10000000 -maxrate:v 10000000 -bufsize:v 20000000 -acodec libfdk_aac -profile:a aac_low -ab 192k -map 0:v -map \"[aout0]\"  -muxrate 11211200  -streamid 0:2064  -streamid 1:2068 %{OUT} 2>&1",
      PRO_1080_2_TRACKS => "ffmpeg -y -i %{IN} -vf \"fps=25.000000,scale=1920x1080\" -filter_complex \"[0:a:1][0:a:2]amerge=inputs=2[aout0]\" -pix_fmt yuv420p  -vcodec h264 -g 13 -bf 2 -x264opts nal-hrd=cbr -profile:v high -flags +ilme+ildct -top 1 -vb 10000000 -minrate:v 10000000 -maxrate:v 10000000 -bufsize:v 20000000 -acodec libfdk_aac -profile:a aac_low -ab 192k -map 0:v -map \"[aout0]\"  -muxrate 11211200  -streamid 0:2064  -streamid 1:2068 %{OUT} 2>&1",
      PRO_1080_STEREO => "ffmpeg -y -i %{IN} -vf \"fps=25.000000,scale=1920x1080\" -pix_fmt yuv420p  -vcodec h264 -g 13 -bf 2 -x264opts nal-hrd=cbr -profile:v high -flags +ilme+ildct -top 1 -vb 10000000 -minrate:v 10000000 -maxrate:v 10000000 -bufsize:v 20000000 -acodec libfdk_aac -profile:a aac_low -ab 192k -map 0:v -map 0:a:0  -muxrate 11211200  -streamid 0:2064  -streamid 1:2068  -vsync 1 -async 1 %{OUT} 2>&1",
      PRO_720_STEREO => "ffmpeg -y -i %{IN} -vf \"fps=25.000000,scale=1920x1080\" -pix_fmt yuv420p  -vcodec h264 -g 13 -bf 2 -x264opts nal-hrd=cbr -profile:v high -flags +ilme+ildct -top 1 -vb 10000000 -minrate:v 10000000 -maxrate:v 10000000 -bufsize:v 20000000 -acodec libfdk_aac -profile:a aac_low -ab 192k -map 0:v -map 0:a:0  -muxrate 11211200  -streamid 0:2064  -streamid 1:2068  -vsync 1 -async 1 %{OUT} 2>&1",
    }
  end

  def video_checks
    {
      ALLOWED_ASPECT_RATIO => ["4:3", "16:9"],
      ALLOWED_HEIGHT => [720, 1080],
      ALLOWED_WIDTH => [1280, 1920], 
      ALLOWED_FRAME_RATE => IGNORE,
      ALLOWED_VIDEO_BIT_RATE => IGNORE, #Mbps
      ALLOWED_SCAN_TYPE => IGNORE, #all downcased
    }
  end

  def audio_checks
    {
      PRESENCE_OF_AUDIO_TRACK => VALIDATE,
      ALLOWED_NUMBER_OF_AUDIO_TRACKS => [1, 4, 8, 14, 16],
      ALLOWED_AUDIO_CODECS => ["aac", "pcm"],
      ALLOWED_AUDIO_BIT_RATE => IGNORE,
      ALLOWED_NUMBER_OF_AUDIO_CHANNELS => [1, 2],
    }
  end

  #profiles are classified based on height and number of audio tracks
  #1. height can either be 720 or 1080
  #2. if height is 720, one of the audio track must be stereo
  #3. if height is 1080, one of the audio track can be stereo, or it can have, 2,8,14,16 audio tracks
  def set_profile_name
    self.profile_name = nil
    self.error = nil

    mediainfo = self.mediainfo_output
    height = (mediainfo["Video"]["Original_height"] || mediainfo["Video"]["Height"]).split("pixels")[0].gsub(/ /,"")
    
    stereo = false
    audio_tracks = mediainfo["Audio"]
    audio_tracks.each do |track|
      stereo = true if track["Channel_s_"] =~ /2/
    end
    profile_name = (stereo ? height + "_stereo" : height + "_" + audio_tracks.size.to_s + "_tracks")
    self.profile_name = self.class.const_get(("pro_" + profile_name).upcase) rescue nil
    unless self.profiles.keys.include? self.profile_name
      if height == "720" and !stereo
        self.error = "Media with height 720 is supported only if it has a stereo track."
      end 
      if height == "1080" and !([16,14,8,2].include? audio_tracks.size)
        self.error = "Media with height 1080 is supported only with 16, 14, 8 or 2 audio tracks. But media has #{audio_tracks.size} tracks and is not stereo."
      end
      return false
    end
    unless self.profile_name.nil?
      XMorph::Base.logger.debug("XMorph#set_profile_name#gusto: using profile #{self.profile_name}")
    end
    return true
  end

end