Class: Ffmprb::Process::Output

Inherits:
Object
  • Object
show all
Defined in:
lib/ffmprb/process/output.rb

Instance Method Summary collapse

Constructor Details

#initialize(io, only: nil, resolution: Ffmprb::QVGA, fps: 30) ⇒ Output

Returns a new instance of Output.



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# File 'lib/ffmprb/process/output.rb', line 7

def initialize(io, only: nil, resolution: Ffmprb::QVGA, fps: 30)
  @io = io
  @channels = [*only]
  @channels = nil  if @channels.empty?
  @resolution = resolution
  @fps = 30
end

Instance Method Details

#channel?(medium, force = false) ⇒ Boolean

XXX? protected

Returns:

  • (Boolean) 


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# File 'lib/ffmprb/process/output.rb', line 286

def channel?(medium, force=false)
  return @channels && @channels.include?(medium)  if force

  (!@channels || @channels.include?(medium)) &&
    reels_channel?(medium)
end

#cut(after: nil, transition: nil) ⇒ Object

Raises:



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# File 'lib/ffmprb/process/output.rb', line 249

def cut(
  after: nil,
  transition: nil
)
  raise Error, "Nothing to cut yet..."  if @reels.empty? || @reels.last.reel.nil?

  add_reel nil, after, transition, @reels.last.full_screen?
end

#options(process) ⇒ Object

Raises:



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# File 'lib/ffmprb/process/output.rb', line 15

def options(process)
  # XXX TODO manage stream labels through process
  raise Error, "Nothing to roll..."  if @reels.select(&:reel).empty?
  raise Error, "Supporting just full_screen for now, sorry."  unless @reels.all?(&:full_screen?)

  filters = []

  # Concatting
  segments = []
  Ffmprb.logger.debug "Concatting segments: start"

  @reels.each_with_index do |curr_reel, i|

    lbl = nil

    if curr_reel.reel

      # NOTE mapping input to this lbl

      lbl = "rl#{i}"
      lbl_aux = "sp#{i}"

      # NOTE Image-Scaling & Image-Padding to match the target resolution
      # XXX full screen only (see exception above)

      filters +=
        curr_reel.reel.filters_for(lbl_aux, process: process,
          video: channel?(:video), audio: channel?(:audio))
      filters +=
        Filter.scale_pad_fps(target_width, target_height, target_fps, "#{lbl_aux}:v", "#{lbl}:v")  if
        channel?(:video)
      filters +=
        Filter.anull("#{lbl_aux}:a", "#{lbl}:a")  if
        channel?(:audio)
    end

    trim_prev_at = curr_reel.after || (curr_reel.transition && 0)

    if trim_prev_at

      # NOTE make sure previous reel rolls _long_ enough AND then _just_ enough

      prev_lbl = segments.pop
      Ffmprb.logger.debug "Concatting segments: #{prev_lbl} popped"

      lbl_pad = "bl#{prev_lbl}#{i}"
      # NOTE generously padding the previous segment to support for all the cases
      filters +=
        Filter.black_source(trim_prev_at + curr_reel.transition_length, target_resolution, target_fps, "#{lbl_pad}:v")  if
        channel?(:video)
      filters +=
        Filter.silent_source(trim_prev_at + curr_reel.transition_length, "#{lbl_pad}:a")  if
        channel?(:audio)

      if prev_lbl
        lbl_aux = lbl_pad
        lbl_pad = "pd#{prev_lbl}#{i}"
        filters +=
          Filter.concat_v(["#{prev_lbl}:v", "#{lbl_aux}:v"], "#{lbl_pad}:v")  if
          channel?(:video)
        filters +=
          Filter.concat_a(["#{prev_lbl}:a", "#{lbl_aux}:a"], "#{lbl_pad}:a")  if
          channel?(:audio)
      end

      if curr_reel.transition

        # NOTE Split the previous segment for transition

        if trim_prev_at > 0
          filters +=
            Filter.split("#{lbl_pad}:v", ["#{lbl_pad}a:v", "#{lbl_pad}b:v"])  if
            channel?(:video)
          filters +=
            Filter.asplit("#{lbl_pad}:a", ["#{lbl_pad}a:a", "#{lbl_pad}b:a"])  if
            channel?(:audio)
          lbl_pad, lbl_pad_ = "#{lbl_pad}a", "#{lbl_pad}b"
        else
          lbl_pad, lbl_pad_ = nil, lbl_pad
        end
      end

      if lbl_pad

        # NOTE Trim the previous segment finally

        new_prev_lbl = "tm#{prev_lbl}#{i}a"

        filters +=
          Filter.trim(0, trim_prev_at, "#{lbl_pad}:v", "#{new_prev_lbl}:v")  if
          channel?(:video)
        filters +=
          Filter.atrim(0, trim_prev_at, "#{lbl_pad}:a", "#{new_prev_lbl}:a")  if
          channel?(:audio)

        segments << new_prev_lbl
        Ffmprb.logger.debug "Concatting segments: #{new_prev_lbl} pushed"
      end

      if curr_reel.transition

        # NOTE snip the end of the previous segment and combine with this reel

        lbl_end1 = "tm#{i}b"
        lbl_reel = "tn#{i}"
        if !lbl  # no reel
          lbl_aux = "bk#{i}"
          filters +=
            Filter.black_source(curr_reel.transition_length, target_resolution, target_fps, "#{lbl_aux}:v")  if
            channel?(:video)
          filters +=
            Filter.silent_source(curr_reel.transition_length, "#{lbl_aux}:a")  if
            channel?(:audio)
        end  # NOTE else hope lbl is long enough for the transition
        filters +=
          Filter.trim(trim_prev_at, trim_prev_at + curr_reel.transition_length, "#{lbl_pad_}:v", "#{lbl_end1}:v")  if
          channel?(:video)
        filters +=
          Filter.atrim(trim_prev_at, trim_prev_at + curr_reel.transition_length, "#{lbl_pad_}:a", "#{lbl_end1}:a")  if
          channel?(:audio)
        filters +=
          Filter.transition_av(curr_reel.transition, target_resolution, target_fps, [lbl_end1, lbl || lbl_aux], lbl_reel,
            video: channel?(:video), audio: channel?(:audio))
        lbl = lbl_reel
      end

    end

    segments << lbl  # NOTE can be nil
    Ffmprb.logger.debug "Concatting segments: #{lbl} pushed"
  end

  segments.compact!

  lbl_out = 'oo'

  filters +=
    Filter.concat_v(segments.map{|s| "#{s}:v"}, "#{lbl_out}:v")  if channel?(:video)
  filters +=
    Filter.concat_a(segments.map{|s| "#{s}:a"}, "#{lbl_out}:a")  if channel?(:audio)

  # Overlays

  # NOTE in-process overlays first

  @overlays.to_a.each_with_index do |over_reel, i|

    # XXX this is currently a single case of multi-process... process
    unless over_reel.duck
      raise Error, "Video overlays are not implemented just yet, sorry..."  if over_reel.reel.channel?(:video)

      # Audio overlaying

      lbl_nxt = "oo#{i}"

      lbl_over = "ol#{i}"
      filters +=
        over_reel.reel.filters_for(lbl_over, process: process)  # NOTE audio only, see above

      filters +=
        Filter.copy("#{lbl_out}:v", "#{lbl_nxt}:v")  if channel?(:video)
      filters +=
        Filter.amix(["#{lbl_out}:a", "#{lbl_over}:a"], "#{lbl_nxt}:a")  if channel?(:audio)

      lbl_out = lbl_nxt
    end

  end

  # NOTE multi-process overlays last

  channel_lbl_ios = {}  # XXX this is a spaghetti machine
  channel_lbl_ios["#{lbl_out}:v"] = @io  if channel?(:video)
  channel_lbl_ios["#{lbl_out}:a"] = @io  if channel?(:audio)

  # XXX supporting just "full" overlays for now, see exception in #add_reel
  @overlays.to_a.each_with_index do |over_reel, i|

    # XXX this is currently a single case of multi-process... process
    if over_reel.duck
      raise Error, "Don't know how to duck video... yet"  if over_reel.duck != :audio

      # So ducking just audio here, ye?

      main_a_o = channel_lbl_ios["#{lbl_out}:a"]
      raise Error, "Main output does not contain audio to duck"  unless main_a_o
      # XXX#181845 must really seperate channels for streaming (e.g. mp4 wouldn't stream through the fifo)
      main_a_inter_o = File.temp_fifo(main_a_o.extname)
      channel_lbl_ios.each do |channel_lbl, io|
        channel_lbl_ios[channel_lbl] = main_a_inter_o  if io == main_a_o  # XXX ~~~spaghetti
      end
      Ffmprb.logger.debug "Re-routed the main audio output (#{main_a_inter_o.path}->...->#{main_a_o.path}) through the process of audio ducking"

      overlay_io = File.buffered_fifo(Process.intermediate_channel_extname :audio)
      process.threaded overlay_io.thr
      lbl_over = "ol#{i}"
      filters +=
        over_reel.reel.filters_for(lbl_over, process: process, video: false, audio: true)
      channel_lbl_ios["#{lbl_over}:a"] = overlay_io.in
      Ffmprb.logger.debug "Routed and buffering an auxiliary output fifos (#{overlay_io.in.path}>#{overlay_io.out.path}) for overlay"

      inter_io = File.buffered_fifo(main_a_inter_o.extname)
      process.threaded inter_io.thr
      Ffmprb.logger.debug "Allocated fifos to buffer media (#{inter_io.in.path}>#{inter_io.out.path}) while finding silence"

      thr = Util::Thread.new "audio ducking" do
        silence = Ffmprb.find_silence(main_a_inter_o, inter_io.in)

        Ffmprb.logger.debug "Audio ducking with silence: [#{silence.map{|s| "#{s.start_at}-#{s.end_at}"}.join ', '}]"

        Process.duck_audio inter_io.out, overlay_io.out, silence, main_a_o,
          video: (channel?(:video)? {resolution: target_resolution, fps: target_fps}: false)
      end
      process.threaded thr
    end

  end

  Filter.complex_options(filters).tap do |options|

    io_channel_lbls = {}  # XXX ~~~spaghetti
    channel_lbl_ios.each do |channel_lbl, io|
      (io_channel_lbls[io] ||= []) << channel_lbl
    end
    io_channel_lbls.each do |io, channel_lbls|
      channel_lbls.each do |channel_lbl|
        options << " -map \"[#{channel_lbl}]\""
      end
      options << " #{io.path}"
    end

  end
end

#overlay(reel, at: 0, duck: nil) ⇒ Object

Raises:



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# File 'lib/ffmprb/process/output.rb', line 258

def overlay(
  reel,
  at: 0,
  duck: nil
)
  raise Error, "Nothing to overlay..."  unless reel
  raise Error, "Nothing to lay over yet..."  if @reels.to_a.empty?
  raise Error, "Ducking overlays should come last... for now"  if !duck && @overlays.to_a.last && @overlays.to_a.last.duck

  (@overlays ||= []) <<
    OpenStruct.new(reel: reel, at: at, duck: duck)
end

#roll(reel, onto: :full_screen, after: nil, transition: nil) ⇒ Object

Raises:



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# File 'lib/ffmprb/process/output.rb', line 271

def roll(
  reel,
  onto: :full_screen,
  after: nil,
  transition: nil
)
  raise Error, "Nothing to roll..."  unless reel
  raise Error, "Supporting :transition with :after only at the moment, sorry."  unless
    !transition || after || @reels.to_a.empty?

  add_reel reel, after, transition, (onto == :full_screen)
end