Class: Ffmprb::Process

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

Defined Under Namespace

Classes: Input, Output

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args, **opts, &blk) ⇒ Process

Returns a new instance of Process.



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# File 'lib/ffmprb/process.rb', line 62

def initialize(*args, **opts, &blk)
  @inputs = []
  @timeout = opts[:timeout] || self.class.timeout
end

Class Attribute Details

.duck_audio_silent_min ⇒ Object

Returns the value of attribute duck_audio_silent_min.



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# File 'lib/ffmprb/process.rb', line 8

def duck_audio_silent_min
  @duck_audio_silent_min
end

.duck_audio_transition_length ⇒ Object

Returns the value of attribute duck_audio_transition_length.



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# File 'lib/ffmprb/process.rb', line 8

def duck_audio_transition_length
  @duck_audio_transition_length
end

.duck_audio_volume_hi ⇒ Object

Returns the value of attribute duck_audio_volume_hi.



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

def duck_audio_volume_hi
  @duck_audio_volume_hi
end

.duck_audio_volume_lo ⇒ Object

Returns the value of attribute duck_audio_volume_lo.



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

def duck_audio_volume_lo
  @duck_audio_volume_lo
end

.timeout ⇒ Object

Returns the value of attribute timeout.



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# File 'lib/ffmprb/process.rb', line 10

def timeout
  @timeout
end

Instance Attribute Details

#timeout ⇒ Object (readonly)

Returns the value of attribute timeout.



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# File 'lib/ffmprb/process.rb', line 60

def timeout
  @timeout
end

Class Method Details

.duck_audio(av_main_i, a_overlay_i, silence, av_main_o, volume_lo: duck_audio_volume_lo, volume_hi: duck_audio_volume_hi, silent_min: duck_audio_silent_min, transition_length: duck_audio_transition_length, video: {resolution: Ffmprb::CGA, fps: 30}) ⇒ Object 



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# File 'lib/ffmprb/process.rb', line 24

def duck_audio(av_main_i, a_overlay_i, silence, av_main_o,
  volume_lo: duck_audio_volume_lo, volume_hi: duck_audio_volume_hi,
  silent_min: duck_audio_silent_min, transition_length: duck_audio_transition_length,
  video: {resolution: Ffmprb::CGA, fps: 30}  # XXX temporary
  )
  Ffmprb.process(av_main_i, a_overlay_i, silence, av_main_o) do |main_input, overlay_input, duck_data, main_output|

    in_main = input(main_input, **(video ? {} : {only: :audio}))
    in_over = input(overlay_input, only: :audio)
    output(main_output, **(video ? {resolution: video[:resolution], fps: video[:fps]} : {})) do
      roll in_main

      ducked_overlay_volume = {0.0 => volume_lo}
      duck_data.each do |silent|
        next  if silent.end_at && silent.start_at && (silent.end_at - silent.start_at) < silent_min

        ducked_overlay_volume.merge!(
          [silent.start_at - transition_length/2, 0.0].max => volume_lo,
          (silent.start_at + transition_length/2) => volume_hi
        )  if silent.start_at

        ducked_overlay_volume.merge!(
          [silent.end_at - transition_length/2, 0.0].max => volume_hi,
          (silent.end_at + transition_length/2) => volume_lo
        )  if silent.end_at
      end
      overlay in_over.volume ducked_overlay_volume

      Ffmprb.logger.debug "Ducking audio with volumes: {#{ducked_overlay_volume.map{|t,v| "#{t}: #{v}"}.join ', '}}"
    end

  end
end

.intermediate_channel_extname(*media) ⇒ Object 



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# File 'lib/ffmprb/process.rb', line 12

def intermediate_channel_extname(*media)
  if media == [:video]
    '.y4m'
  elsif media == [:audio]
    '.wav'
  elsif media.sort == [:audio, :video]
    '.flv'
  else
    fail Error, "I don't know how to channel [#{media.join ', '}]"
  end
end

Instance Method Details

#[](obj) ⇒ Object 



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# File 'lib/ffmprb/process.rb', line 94

def [](obj)
  case obj
  when Input
    @inputs.find_index(obj)
  end
end

#input(io, only: nil) ⇒ Object 



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# File 'lib/ffmprb/process.rb', line 67

def input(io, only: nil)
  Input.new(io, only: only).tap do |inp|
    @inputs << inp
  end
end

#output(io, only: nil, resolution: Ffmprb::CGA, fps: 30, &blk) ⇒ Object 



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# File 'lib/ffmprb/process.rb', line 73

def output(io, only: nil, resolution: Ffmprb::CGA, fps: 30, &blk)
  fail Error, "Just one output for now, sorry."  if @output

  @output = Output.new(io, only: only, resolution: resolution, fps: fps).tap do |out|
    out.instance_exec &blk
  end
end

#run(limit: nil) ⇒ Object

NOTE the one and the only entry-point processing function which spawns threads etc



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# File 'lib/ffmprb/process.rb', line 82

def run(limit: nil)  # (async: false)
  # NOTE this is both for the future async: option and according to
  # the threading policy (a parent death will be noticed and handled by children)
  thr = Util::Thread.new do
    # NOTE yes, an exception can occur anytime, and we'll just die, it's ok, see above
    Util.ffmpeg(*command, limit: limit, timeout: timeout).tap do |res|  # XXX just to return something
      Util::Thread.join_children! limit, timeout: timeout
    end
  end
  thr.value  if thr.join limit  # NOTE should not block for more than limit
end