Class: Awslive::Poster

Inherits:
Object
  • Object
show all
Defined in:
lib/awslive-poster/awslive_poster.rb

Defined Under Namespace

Classes: InvalidChannelState, NoFrameCaptureOutputGroup, NoStartTimeInTag, PosterImageDoesNotExist

Constant Summary collapse

MAX_CHANNEL_START_TIME = 
2 * 60

Instance Method Summary collapse

Constructor Details

#initialize(channel_id, access_key = nil, access_secret = nil, region = nil) ⇒ Poster

Returns a new instance of Poster.



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# File 'lib/awslive-poster/awslive_poster.rb', line 15

def initialize(channel_id, access_key=nil , access_secret =nil, region = nil)
  credentials = Aws::SharedCredentials.new
  if !access_key.nil? && !access_secret.nil?
    aws_region = region.nil? ? 'us-east-1' : region
    puts "AWS REgion #{aws_region}"
    @medialiveclient = Aws::MediaLive::Client.new( :access_key_id => access_key, :secret_access_key => access_secret, :region => aws_region )
    client = Aws::S3::Client.new(access_key_id: access_key, secret_access_key: access_secret, region: 'us-east-1')
    @s3 = Aws::S3::Resource.new(client: client)
  elsif credentials.set?
    @medialiveclient = Aws::MediaLive::Client.new(:credentials => credentials)
    @s3 = Aws::S3::Client.new(:credentials => credentials)
  else
    @medialiveclient = Aws::MediaLive::Client.new
    @s3 = Aws::S3::Client.new
  end
  @channel_id = channel_id
  @last_computed_time = nil

  @last_preview_url = nil
  @interval = nil
end

Instance Method Details

#compute_index(start_time, interval) ⇒ Object 



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# File 'lib/awslive-poster/awslive_poster.rb', line 80

def compute_index(start_time, interval)
  channel_start_time = Time.iso8601(start_time).to_i
  current_time = Time.now.utc.to_i
  diff_time = current_time - channel_start_time
  image_index = (diff_time / interval.to_i).round
  index =  image_index.to_s.rjust(5,'0')
  index
end

#get_channel_start_time(channel_info) ⇒ Object 



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# File 'lib/awslive-poster/awslive_poster.rb', line 89

def get_channel_start_time(channel_info)
  start_time = channel_info.tags["channel_start_time"]
  start_time
end

#get_dest_info(out_grp) ⇒ Object 



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# File 'lib/awslive-poster/awslive_poster.rb', line 108

def get_dest_info(out_grp)
  dest =  nil
  if !out_grp["output_group_settings"]["frame_capture_group_settings"].nil?
    dest = out_grp["output_group_settings"]["frame_capture_group_settings"]["destination"]["destination_ref_id"] rescue nil
  end
  dest
end

#get_dest_url(dest_info, channel_info) ⇒ Object 



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# File 'lib/awslive-poster/awslive_poster.rb', line 116

def get_dest_url(dest_info, channel_info)
  url = nil
  if !channel_info["destinations"].nil?
    channel_info["destinations"].each do | dest |
      if dest["id"] == dest_info
        url = dest["settings"][0]["url"]
        break if !url.nil?
      end
    end
  end
  url
end

#get_framecapture_group(encode_setting) ⇒ Object 



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# File 'lib/awslive-poster/awslive_poster.rb', line 94

def get_framecapture_group(encode_setting)
  out_grp = nil
  outputgroups = encode_setting["output_groups"] rescue nil
  unless outputgroups.nil?
    outputgroups.each do | output |
      if !output["output_group_settings"]["frame_capture_group_settings"].nil?
        out_grp = output
        break if !out_grp.nil?
      end
    end
  end
  out_grp
end

#get_framecapture_interval(out_grp, channel_info) ⇒ Object 



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# File 'lib/awslive-poster/awslive_poster.rb', line 134

def get_framecapture_interval(out_grp, channel_info)
  interval = nil
  video_desc_name = out_grp["outputs"][0]["video_description_name"]
  if !video_desc_name.nil?
    video_desc_info = get_video_description_info(video_desc_name, channel_info)
    if !video_desc_info.nil?
      interval = video_desc_info["codec_settings"]["frame_capture_settings"]["capture_interval"]
    end
  end
  interval
end

#get_framecapture_modifier(out_grp) ⇒ Object 



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# File 'lib/awslive-poster/awslive_poster.rb', line 129

def get_framecapture_modifier(out_grp)
  modifier = out_grp["outputs"][0]["output_settings"]["frame_capture_output_settings"]["name_modifier"] rescue nil
  modifier
end

#get_presigned_url(obj) ⇒ Object 



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# File 'lib/awslive-poster/awslive_poster.rb', line 70

def get_presigned_url(obj)
  url = nil
  puts "Fetching the object at #{Time.now}"
  puts "Object #{obj}"
  if obj.exists?
    url = obj.presigned_url(:get) rescue nil
  end
  url
end

#get_url(channel_info = nil) ⇒ Object 



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# File 'lib/awslive-poster/awslive_poster.rb', line 37

def get_url(channel_info = nil)
  preview_url = nil
  channel_info = @medialiveclient.describe_channel({ :channel_id => "#{@channel_id}" }) if channel_info.nil?
  channel_state = channel_info[:state]
  if channel_state == "RUNNING"
    @last_computed_time = Time.now.to_i
    out_group = get_framecapture_group(channel_info["encoder_settings"])
    raise NoFrameCaptureOutputGroup.new("Framecapture output group should be configured!") if out_group.nil?
    start_time = get_channel_start_time(channel_info)
    raise NoStartTimeInTag.new("channel_start_time should be provisioned in Channel tag!") if start_time.nil?
    dest_id = get_dest_info(out_group)
    url = get_dest_url(dest_id, channel_info)
    uri = URI(url)
    modifier = get_framecapture_modifier(out_group)
    @interval = get_framecapture_interval(out_group, channel_info)
    seq_counter = compute_index(start_time, @interval)
    suffix = uri.path[1..-1]
    bucket = @s3.bucket("#{uri.host}")
    puts "object prefix #{suffix}#{modifier}.#{seq_counter}.jpg"
    obj = bucket.object("#{suffix}#{modifier}.#{seq_counter}.jpg")
    preview_url = get_presigned_url(obj) rescue nil
    if preview_url.nil?
      puts "seems delay in generating posters; giving a pause for fetching!!"
      sleep (@interval / 2 ).round
      preview_url = get_presigned_url(obj)
    end
    raise PosterImageDoesNotExist.new("Poster Image #{suffix}#{modifier}.#{seq_counter}.jpg Does not exist!") if preview_url.nil?
  else
    raise InvalidChannelState.new("Channel Need to be in running state!, current state is #{channel_state}")
  end
  preview_url
end

#get_video_description_info(desc_name, channel_info) ⇒ Object 



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# File 'lib/awslive-poster/awslive_poster.rb', line 146

def get_video_description_info(desc_name, channel_info)
  video_info = nil
  videos_desc = channel_info["encoder_settings"]["video_descriptions"]
  if !videos_desc.nil?
    videos_desc.each do | description |
      if description["name"] == desc_name
        video_info = description
        break
      end
    end
  end
  video_info
end