Add mono read (short/float) calls to the ruby interface.

Fixes #4.

lib/ffi/openmpt/module.rb

@@ -150,6 +150,14 @@ def volume_ramping=(value)
         )
       end
 
+      def read_mono(frames, buffer)
+        openmpt_module_read_mono(@mod, @sample_rate, frames, buffer)
+      end
+
+      def read_float_mono(frames, buffer)
+        openmpt_module_read_float_mono(@mod, @sample_rate, frames, buffer)
+      end
+
       def read_stereo(frames, left, right)
         openmpt_module_read_stereo(@mod, @sample_rate, frames, left, right)
       end

test/openmpt_module_test.rb

@@ -164,6 +164,44 @@ def test_render_params_ramping
     end
   end
 
+  def test_read_mono
+    duration = 10
+    raw = ::File.read(RAW_LAST_SUN_MONO_INT16)
+
+    ::FFI::OpenMPT::Module.open(MOD_LAST_SUN) do |mod|
+      frames = mod.sample_rate / duration
+      bytesize = frames * 2
+      buffer = ::FFI::MemoryPointer.new(:short, frames)
+
+      100.times do |i|
+        count = mod.read_mono(frames, buffer)
+        assert_equal count, frames
+
+        oracle = raw.byteslice((i * bytesize), bytesize).unpack('s*')
+        assert_equal buffer.read_array_of_int16(count), oracle
+      end
+    end
+  end
+
+  def test_read_float_mono
+    duration = 10
+    raw = ::File.read(RAW_LAST_SUN_MONO_FLOAT)
+
+    ::FFI::OpenMPT::Module.open(MOD_LAST_SUN) do |mod|
+      frames = mod.sample_rate / duration
+      bytesize = frames * 4
+      buffer = ::FFI::MemoryPointer.new(:float, frames)
+
+      100.times do |i|
+        count = mod.read_float_mono(frames, buffer)
+        assert_equal count, frames
+
+        oracle = raw.byteslice((i * bytesize), bytesize).unpack('e*')
+        assert_equal buffer.read_array_of_float(count), oracle
+      end
+    end
+  end
+
   def test_read_stereo
     duration = 10
     raw = ::File.read(RAW_LAST_SUN_INT16)