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#!/usr/bin/env ruby
#
# Copyright (C) 2024 Ruby-GNOME Project Team
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
require "gst"
pipeline = Gst::Pipeline.new("audio-extractor")
src = Gst::ElementFactory.make("autoaudiosrc", nil)
raise "need audiotestsrc from gst-plugins-good" if src.nil?
resample = Gst::ElementFactory.make("audioresample", nil)
raise "need audioresample from gst-plugins-base" if resample.nil?
sink = Gst::ElementFactory.make("appsink", nil)
raise "need appsink from gst-plugins-base" if sink.nil?
# See https://gstreamer.freedesktop.org/documentation/additional/design/mediatype-audio-raw.html
caps = Gst::Caps.new("audio/x-raw")
caps["format"] = "F32LE"
caps["rate", :int] = 16 * 1000
caps["channels", :int] = 1
sink.caps = caps
sink.emit_signals = true
sink.signal_connect(:new_sample) do |_|
sample = sink.pull_sample
buffer = sample.buffer
success, map = buffer.map(:read)
p map.data
buffer.unmap(map)
Gst::FlowReturn::OK
end
pipeline << src << resample << sink
src >> resample >> sink
loop = GLib::MainLoop.new
bus = pipeline.bus
bus.add_watch do |bus, message|
case message.type
when Gst::MessageType::EOS
puts "End-of-stream"
loop.quit
when Gst::MessageType::ERROR
error, debug = message.parse_error
puts "Debugging info: #{debug || 'none'}"
puts "Error: #{error.message}"
loop.quit
end
true
end
pipeline.play
begin
loop.run
rescue Interrupt
puts "Interrupt"
rescue => error
puts "Error: #{error.message}"
ensure
pipeline.stop
end
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