3 files changed, 42 insertions, 35 deletions
diff --git a/sound/adpcm.cpp b/sound/adpcm.cpp
index 32ea6dc6eb..b1270d9220 100644
--- a/sound/adpcm.cpp
+++ b/sound/adpcm.cpp
@@ -23,7 +23,42 @@
 #include "common/stdafx.h"
 
 #include "sound/adpcm.h"
-
+#include "sound/audiostream.h"
+
+
+// TODO: Switch from a SeekableReadStream to a plain ReadStream. This requires
+// some internal refactoring but is definitely possible and will increase the
+// flexibility of this code.
+class ADPCMInputStream : public AudioStream {
+private:
+	Common::SeekableReadStream *_stream;
+	uint32 _endpos;
+	int _channels;
+	typesADPCM _type;
+	uint32 _blockAlign;
+
+	struct adpcmStatus {
+		int32 last;
+		int32 stepIndex;
+	} _status;
+
+	int16 stepAdjust(byte);
+	int16 decodeOKI(byte);
+	int16 decodeMSIMA(byte);
+
+public:
+	ADPCMInputStream(Common::SeekableReadStream *stream, uint32 size, typesADPCM type, int channels = 2, uint32 blockAlign = 0);
+	~ADPCMInputStream() {};
+
+	int readBuffer(int16 *buffer, const int numSamples);
+	int readBufferOKI(int16 *buffer, const int numSamples);
+	int readBufferMSIMA1(int16 *buffer, const int numSamples);
+	int readBufferMSIMA2(int16 *buffer, const int numSamples);
+
+	bool endOfData() const { return (_stream->eos() || _stream->pos() >= _endpos); }
+	bool isStereo() const	{ return false; }
+	int getRate() const	{ return 22050; }
+};
 
 // Routines to convert 12 bit linear samples to the
 // Dialogic or Oki ADPCM coding format aka VOX.
@@ -205,3 +240,7 @@ int16 ADPCMInputStream::decodeMSIMA(byte code) {
 
 	return samp;
 }
+
+AudioStream *makeADPCMStream(Common::SeekableReadStream *stream, uint32 size, typesADPCM type, int channels, uint32 blockAlign) {
+	return new ADPCMInputStream(stream, size, type, channels, blockAlign);
+}
diff --git a/sound/adpcm.h b/sound/adpcm.h
index ac24805eff..aea1beaf60 100644
--- a/sound/adpcm.h
+++ b/sound/adpcm.h
@@ -26,7 +26,6 @@
 #include "common/stdafx.h"
 #include "common/scummsys.h"
 #include "common/stream.h"
-#include "sound/audiostream.h"
 
 class AudioStream;
 
@@ -35,38 +34,7 @@ enum typesADPCM {
 	kADPCMIma
 };
 
-// TODO: Switch from a SeekableReadStream to a plain ReadStream. This requires
-// some internal refactoring but is definitely possible and will increase the
-// flexibility of this code.
-class ADPCMInputStream : public AudioStream {
-private:
-	Common::SeekableReadStream *_stream;
-	uint32 _endpos;
-	int _channels;
-	typesADPCM _type;
-	uint32 _blockAlign;
+AudioStream *makeADPCMStream(Common::SeekableReadStream *stream, uint32 size, typesADPCM type, int channels = 2, uint32 blockAlign = 0);
 
-	struct adpcmStatus {
-		int32 last;
-		int32 stepIndex;
-	} _status;
-
-	int16 stepAdjust(byte);
-	int16 decodeOKI(byte);
-	int16 decodeMSIMA(byte);
-
-public:
-	ADPCMInputStream(Common::SeekableReadStream *stream, uint32 size, typesADPCM type, int channels = 2, uint32 blockAlign = 0);
-	~ADPCMInputStream() {};
-
-	int readBuffer(int16 *buffer, const int numSamples);
-	int readBufferOKI(int16 *buffer, const int numSamples);
-	int readBufferMSIMA1(int16 *buffer, const int numSamples);
-	int readBufferMSIMA2(int16 *buffer, const int numSamples);
-
-	bool endOfData() const { return (_stream->eos() || _stream->pos() >= _endpos); }
-	bool isStereo() const	{ return false; }
-	int getRate() const	{ return 22050; }
-};
 
 #endif
diff --git a/sound/wave.cpp b/sound/wave.cpp
index 0923c60c47..f6ba3fed27 100644
--- a/sound/wave.cpp
+++ b/sound/wave.cpp
@@ -165,7 +165,7 @@ AudioStream *makeWAVStream(Common::SeekableReadStream &stream) {
 		return 0;
 
 	if (type == 17) // IMA ADPCM
-		return new ADPCMInputStream(&stream, size, kADPCMIma, (flags & Audio::Mixer::FLAG_STEREO) ? 2 : 1);
+		return makeADPCMStream(&stream, size, kADPCMIma, (flags & Audio::Mixer::FLAG_STEREO) ? 2 : 1);
 
 	byte *data = (byte *)malloc(size);
 	assert(data);