Class: Hornetseye::AVOutput

Inherits:
Object
  • Object
show all
Defined in:
lib/hornetseye-ffmpeg/avoutput.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.new(mrl, video_bit_rate, width, height, frame_rate, aspect_ratio = 1, video_codec = nil, have_audio = false, audio_bit_rate = 64000, sample_rate = 44100, channels = 2, audio_codec = nil) ⇒ Object 



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# File 'lib/hornetseye-ffmpeg/avoutput.rb', line 26

def new( mrl, video_bit_rate, width, height, frame_rate, aspect_ratio = 1,
         video_codec = nil, have_audio = false, audio_bit_rate = 64000,
         sample_rate = 44100, channels = 2, audio_codec = nil )
  if frame_rate.is_a? Float
    frame_rate = 90000.quo( ( 90000 / frame_rate ).to_i )
  end
  retval = orig_new mrl, video_bit_rate, width, height,
                    frame_rate.denominator, frame_rate.numerator,
                    aspect_ratio.numerator, aspect_ratio.denominator,
                    video_codec || CODEC_ID_NONE,
                    have_audio ? audio_bit_rate : 0,
                    have_audio ? sample_rate : 0,
                    have_audio ? channels : 0,
                    audio_codec || CODEC_ID_NONE
  if have_audio
    retval.instance_eval do
      @audio_buffer = MultiArray.new SINT, channels, frame_size
      @audio_samples = 0
    end
  end
  retval
end

.orig_new ⇒ Object 



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# File 'lib/hornetseye-ffmpeg/avoutput.rb', line 24

alias_method :orig_new, :new

Instance Method Details

#orig_write_audio ⇒ Object 



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# File 'lib/hornetseye-ffmpeg/avoutput.rb', line 59

alias_method :orig_write_audio, :write_audio

#orig_write_video ⇒ Object 



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# File 'lib/hornetseye-ffmpeg/avoutput.rb', line 51

alias_method :orig_write_video, :write_video

#write_audio(frame) ⇒ Object 



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# File 'lib/hornetseye-ffmpeg/avoutput.rb', line 61

def write_audio( frame )
  unless frame.typecode == SINT
    raise "Audio frame must have elements of type SINT (but elements were of " +
          "type #{frame.typecode})"
  end
  unless frame.dimension == 2
    raise "Audio frame must have 2 dimensions (but had #{frame.dimensions})"
  end
  unless frame.shape.first == channels
    raise "Audio frame must have #{channels} channels " +
          "(but had #{frame.shape.first})"
  end
  size = frame_size * 2 * channels
  remaining = frame
  while @audio_samples + remaining.shape.last >= frame_size
    if @audio_samples > 0
      @audio_buffer[ @audio_samples ... frame_size ] =
        remaining[ 0 ... frame_size - @audio_samples ]
      orig_write_audio Sequence.import(UBYTE, @audio_buffer.memory, size)
      remaining = remaining[ 0 ... channels,
                             frame_size - @audio_samples ... remaining.shape.last ]
      @audio_samples = 0
    else
      orig_write_audio Sequence.import(UBYTE, remaining.memory, size)
      remaining = remaining[ 0 ... channels, frame_size ... remaining.shape.last ]
    end
  end
  if remaining.shape.last > 0
    @audio_buffer[ 0 ... channels, @audio_samples ... @audio_samples +
                   remaining.shape.last ] = remaining
    @audio_samples += remaining.shape.last
  end
  frame
end

#write_video(frame) ⇒ Object Also known as: write 



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# File 'lib/hornetseye-ffmpeg/avoutput.rb', line 53

def write_video( frame )
  orig_write_video frame.to_yv12
end