Add preliminary audio processing

- Mixing still isn't implemented, but the audio system should be able
   to start up, and mix at least once audio line for the time being.
   Will have to write some test audio sources to verify things are
   working properly, and build the rest of the output functionality.

obs/window-basic-main.cpp

@@ -199,6 +199,8 @@ bool OBSBasic::Init()
 		return false;
 	if (!InitGraphics())
 		return false;
+	if (!InitAudio())
+		return false;
 
 	signal_handler_connect(obs_signalhandler(), "source-add",
 			OBSBasic::SourceAdded, this);
@@ -243,10 +245,20 @@ bool OBSBasic::InitGraphics()
 	ovi.window_width  = size.x;
 	ovi.window_height = size.y;
 
-	if (!obs_reset_video(&ovi))
-		return false;
+	return obs_reset_video(&ovi);
+}
 
-	return true;
+bool OBSBasic::InitAudio()
+{
+	/* TODO: load audio settings from config */
+	struct audio_info ai;
+	ai.name = "test";
+	ai.samples_per_sec = 44100;
+	ai.format = AUDIO_FORMAT_16BIT;
+	ai.speakers = SPEAKERS_STEREO;
+	ai.buffer_ms = 700;
+
+	return obs_reset_audio(&ai);
 }
 
 void OBSBasic::OnClose(wxCloseEvent &event)