First checkin

git-svn-id: https://oreka.svn.sourceforge.net/svnroot/oreka/trunk@122 09dcff7a-b715-0410-9601-b79a96267cd0

1 files changed, 85 insertions, 0 deletions

diff --git a/orkbasecxx/Filter.h b/orkbasecxx/Filter.h
new file mode 100644
index 0000000..379af59
--- /dev/null
+++ b/orkbasecxx/Filter.h
@@ -0,0 +1,85 @@
+/*
+ * Oreka -- A media capture and retrieval platform
+ * 
+ * Copyright (C) 2005, orecx LLC
+ *
+ * http://www.orecx.com
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License.
+ * Please refer to http://www.gnu.org/copyleft/gpl.html
+ *
+ */
+#ifndef __FILTER_H__
+#define __FILTER_H__
+
+#include <list>
+#include "ace/Singleton.h"
+#include "AudioCapture.h"
+
+#ifdef WIN32
+#define __CDECL__ __cdecl
+#else
+#define __CDECL__
+#endif
+
+class Filter;
+
+typedef boost::shared_ptr<Filter> FilterRef;
+
+/** Filter Interface
+ *  a filter is a black box that takes media chunks as an input and produces media chunks as an output
+ *  it can be translating between two encodings (codec) or just processing the signal
+ */
+class DLL_IMPORT_EXPORT Filter
+{
+public:
+	virtual FilterRef __CDECL__ Instanciate() = 0;
+	virtual void __CDECL__ AudioChunkIn(AudioChunkRef& chunk) = 0;
+	virtual void __CDECL__ AudioChunkOut(AudioChunkRef& chunk) = 0;
+	virtual AudioEncodingEnum __CDECL__ GetInputAudioEncoding() = 0;
+	virtual AudioEncodingEnum __CDECL__ GetOutputAudioEncoding() = 0;
+	virtual CStdString __CDECL__ GetName() = 0;
+	/** Input RTP payload time - this is overridden if the filter is a codec that accepts a certain
+	    RTP payload type such as GSM. if not, returns -1 by default */
+	virtual int __CDECL__ GetInputRtpPayloadType();
+};
+//===================================================================
+
+class DLL_IMPORT_EXPORT AlawToPcmFilter : public Filter
+{
+public:
+	FilterRef __CDECL__ Instanciate();
+	void __CDECL__ AudioChunkIn(AudioChunkRef& chunk);
+	void __CDECL__ AudioChunkOut(AudioChunkRef& chunk);
+	AudioEncodingEnum __CDECL__ GetInputAudioEncoding();
+	AudioEncodingEnum __CDECL__ GetOutputAudioEncoding();
+	CStdString __CDECL__ GetName();
+	int __CDECL__ GetInputRtpPayloadType();
+
+private:
+	AudioChunkRef m_outputAudioChunk;
+};
+
+//===================================================================
+
+/** Filter Registry
+*/
+class DLL_IMPORT_EXPORT FilterRegistry
+{
+public:
+	static FilterRegistry* instance();
+	void RegisterFilter(FilterRef& Filter);
+	FilterRef GetNewFilter(AudioEncodingEnum inputEncoding, AudioEncodingEnum outputEncoding);
+	FilterRef GetNewFilter(int rtpPayloadType);
+	FilterRef GetNewFilter(CStdString& filterName);
+
+private:
+	std::list<FilterRef> m_Filters;
+
+	static FilterRegistry* m_singleton;
+};
+
+//typedef ACE_Singleton<FilterRegistry, ACE_Thread_Mutex> FilterRegistrySingleton;
+
+#endif