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/*
* 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;
};
//===================================================================
class DLL_IMPORT_EXPORT UlawToPcmFilter : 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
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