ruby-gstreamer 不发送 EOS 消息
我已经设法让它播放声音，但它从未收到 EOS 消息。 因此脚本永远不会退出。
require 'gst'
main_loop = GLib::MainLoop.new
pipeline = Gst::Pipeline.new "audio-player"
source = Gst::ElementFactory.make "filesrc", "file-source"
source.location = "/usr/share/sounds/gnome/default/alerts/bark.ogg"
decoder = Gst::ElementFactory.make "decodebin", "decoder"
conv = Gst::ElementFactory.make "audioconvert", "converter"
sink = Gst::ElementFactory.make "alsasink", "output"
pipeline.add source, decoder, conv, sink
source >> decoder
conv >> sink
decoder.signal_connect "pad-added" do |element, pad, data|
pad >> conv['sink']
end
pipeline.bus.add_watch do |bus, message|
puts "Message: #{message.inspect}"
case message.type
when Gst::Message::Type::ERROR
puts message.structure["debug"]
main_loop.quit
when Gst::Message::Type::EOS
puts 'End of stream'
main_loop.quit
end
end
pipeline.play
begin
puts 'Running main loop'
main_loop.run
ensure
puts 'Shutting down main loop'
pipeline.stop
end
I've managed to make it play sound but it never gets EOS message.
And thus script never exits.
require 'gst'
main_loop = GLib::MainLoop.new
pipeline = Gst::Pipeline.new "audio-player"
source = Gst::ElementFactory.make "filesrc", "file-source"
source.location = "/usr/share/sounds/gnome/default/alerts/bark.ogg"
decoder = Gst::ElementFactory.make "decodebin", "decoder"
conv = Gst::ElementFactory.make "audioconvert", "converter"
sink = Gst::ElementFactory.make "alsasink", "output"
pipeline.add source, decoder, conv, sink
source >> decoder
conv >> sink
decoder.signal_connect "pad-added" do |element, pad, data|
pad >> conv['sink']
end
pipeline.bus.add_watch do |bus, message|
puts "Message: #{message.inspect}"
case message.type
when Gst::Message::Type::ERROR
puts message.structure["debug"]
main_loop.quit
when Gst::Message::Type::EOS
puts 'End of stream'
main_loop.quit
end
end
pipeline.play
begin
puts 'Running main loop'
main_loop.run
ensure
puts 'Shutting down main loop'
pipeline.stop
end
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我找到了解决方案。与所有可能遇到同样问题的人分享。
真正的问题是该块没有返回
true。它必须返回true才能保持监视。这在 GStreamer 文档的深处有记录，但在 ruby-gnome2 文档中没有提及。I've found a solution. Sharing with everybody who may run into same problem.
The real problem was that block didn't return
true. It has to returntrueto be kept in watch. This is documented somewhere deep in GStreamer docs but is not mentioned in ruby-gnome2 docs.应该是：
错误也一样
should be:
same goes for ERROR