From 72239a25f9608935024560ab07f17a47863de0d7 Mon Sep 17 00:00:00 2001
From: Matthew Hoops
Date: Tue, 11 Aug 2015 23:17:30 -0400
Subject: AUDIO: Add a NullAudioStream for streams that are dead-on-arrival

---
 audio/audiostream.cpp | 21 +++++++++++++++++++++
 audio/audiostream.h   |  6 ++++++
 2 files changed, 27 insertions(+)

(limited to 'audio')

diff --git a/audio/audiostream.cpp b/audio/audiostream.cpp
index c413edb73d..88c41e8503 100644
--- a/audio/audiostream.cpp
+++ b/audio/audiostream.cpp
@@ -33,6 +33,7 @@
 #include "audio/decoders/quicktime.h"
 #include "audio/decoders/raw.h"
 #include "audio/decoders/vorbis.h"
+#include "audio/mixer.h"
 
 
 namespace Audio {
@@ -465,4 +466,24 @@ AudioStream *makeLimitingAudioStream(AudioStream *parentStream, const Timestamp
 	return new LimitingAudioStream(parentStream, length, disposeAfterUse);
 }
 
+/**
+ * An AudioStream that plays nothing and immediately returns that
+ * the endOfStream() has been reached
+ */
+class NullAudioStream : public AudioStream {
+public:
+        bool isStereo() const { return false; }
+        int getRate() const;
+        int readBuffer(int16 *data, const int numSamples) { return 0; }
+        bool endOfData() const { return true; }
+};
+
+int NullAudioStream::getRate() const {
+	return g_system->getMixer()->getOutputRate();
+}
+
+AudioStream *makeNullAudioStream() {
+	return new NullAudioStream();
+}
+
 } // End of namespace Audio
diff --git a/audio/audiostream.h b/audio/audiostream.h
index 6019acaf5a..a60d5a2086 100644
--- a/audio/audiostream.h
+++ b/audio/audiostream.h
@@ -433,6 +433,12 @@ private:
 	Common::ScopedPtr<QueuingAudioStream> _stream;
 };
 
+/**
+ * Create an AudioStream that plays nothing and immediately returns that
+ * endOfStream() has been reached.
+ */
+AudioStream *makeNullAudioStream();
+
 } // End of namespace Audio
 
 #endif
-- 
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