Class: Audio

Inherits:
Object
  • Object
show all
Defined in:
lib/vimamsa/audio.rb

Overview

following the example gstreamer-4.2.0/sample/helloworld_e.rb

Constant Summary collapse

@@playbin = 
nil

Class Method Summary collapse

Class Method Details

.play(fn) ⇒ Object 



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# File 'lib/vimamsa/audio.rb', line 17

def self.play(fn)
  playbin = @@playbin
  if playbin.nil?
    playbin = Gst::ElementFactory.make("playbin")
    if playbin.nil?
      puts "'playbin' gstreamer plugin missing"
      return
    end
  else
    if playbin.current_state == "playing"
      playbin.stop # Stop previous play
    end
  end

  # playbin.seek(10.0)

  # playbin.volume
  # playbin.volume=1.0
  # playbin.stream_time
  # playbin.current_state

  # take the commandline argument and ensure that it is a uri
  if Gst.valid_uri?(fn)
    uri = fn
  else
    uri = Gst.filename_to_uri(fn)
  end
  playbin.uri = uri
  @@playbin = playbin
  $pb = playbin

  bus = playbin.bus
  bus.add_watch do |bus, message|
    case message.type
    when Gst::MessageType::EOS
      puts "End-of-stream"
    when Gst::MessageType::ERROR
      error, debug = message.parse_error
      puts "Debugging info: #{debug || "none"}"
      puts "Error: #{error.message}"
    end
    true
  end

  message("Start playing audio: #{fn}")

  # start play back and listed to events
  playbin.play
  playbin.seek_simple(Gst::Format::TIME, Gst::SeekFlags::NONE, 10.0)
end

.seek_forward(secs = 5.0) ⇒ Object 



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# File 'lib/vimamsa/audio.rb', line 68

def self.seek_forward(secs = 5.0)
  return if @@playbin.nil?
  if @@playbin.current_state == "playing"
    duration = @@playbin.query_duration(Gst::Format::TIME)[1]
    curpos = @@playbin.query_position(Gst::Format::TIME)[1]
    newpos = curpos + secs * 1.0e9
    newpos = 0.0 if newpos < 0
    return if newpos > duration
    @@playbin.seek_simple(Gst::Format::TIME, Gst::SeekFlags::FLUSH, newpos)
    message("New audio pos: #{(newpos / 1.0e9).round(1)}/#{(duration / 1.0e9).round(1)}")
    # $pb.query_position(Gst::Format::TIME)[1]/1.0e9
  end
end

.stop ⇒ Object 



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# File 'lib/vimamsa/audio.rb', line 13

def self.stop
  @@playbin.stop if !@@playbin.nil?
end