From 3e09ac0c10c95bb24a08af62393b4f761e2743d0 Mon Sep 17 00:00:00 2001
From: Eric Wong <normalperson@yhbt.net>
Date: Sat, 24 Aug 2013 09:54:45 +0000
Subject: initial commit

---
 lib/dtas/sink_reader_play.rb | 70 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 lib/dtas/sink_reader_play.rb

(limited to 'lib/dtas/sink_reader_play.rb')

diff --git a/lib/dtas/sink_reader_play.rb b/lib/dtas/sink_reader_play.rb
new file mode 100644
index 0000000..17a0190
--- /dev/null
+++ b/lib/dtas/sink_reader_play.rb
@@ -0,0 +1,70 @@
+# -*- encoding: binary -*-
+# :stopdoc:
+# Copyright (C) 2013, Eric Wong <normalperson@yhbt.net>
+# License: GPLv3 or later (https://www.gnu.org/licenses/gpl-3.0.txt)
+require_relative '../dtas'
+
+# parses lines from play(1) -S/--show-progress like this:
+#  In:0.00% 00:00:37.34 [00:00:00.00] Out:1.65M [ -====|====  ]        Clip:0
+#
+# The authors of sox probably did not intend for the output of play(1) to
+# be parsed, but we do it anyways.  We need to be ready to update this
+# code in case play(1) output changes.
+# play -S/--show-progress
+class DTAS::SinkReaderPlay
+  attr_reader :time, :out, :meter, :clips, :headroom
+  attr_reader :to_io
+  attr_reader :wr # this is stderr of play(1)
+
+  def initialize
+    @to_io, @wr = IO.pipe
+    reset
+  end
+
+  def readable_iter
+    buf = Thread.current[:dtas_lbuf] ||= ""
+    begin
+      @rbuf << @to_io.read_nonblock(1024, buf)
+
+      # do not OOM in case SoX changes output format on us
+      @rbuf.clear if @rbuf.size > 0x10000
+
+      # don't handle partial read
+      next unless / Clip:\S+ *\z/ =~ @rbuf
+
+      if @rbuf.gsub!(/(.*)\rIn:\S+ (\S+) \S+ Out:(\S+)\s+(\[[^\]]+\]) /m, "")
+        err = $1
+        @time = $2
+        @out = $3
+        @meter = $4
+        if @rbuf.gsub!(/Hd:(\d+\.\d+) Clip:(\S+) */, "")
+          @headroom = $1
+          @clips = $2
+        elsif @rbuf.gsub!(/\s+Clip:(\S+) */, "")
+          @headroom = nil
+          @clips = $1
+        end
+
+        $stderr.write(err)
+      end
+    rescue EOFError
+      return nil
+    rescue Errno::EAGAIN
+      return :wait_readable
+    end while true
+  end
+
+  def close
+    @wr.close unless @wr.closed?
+    @to_io.close
+  end
+
+  def reset
+    @rbuf = ""
+    @time = @out = @meter = @headroom = @clips = nil
+  end
+
+  def closed?
+    @to_io.closed?
+  end
+end
-- 
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