First checkin

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

1 files changed, 143 insertions, 0 deletions

diff --git a/orkbasecxx/Filter.cpp b/orkbasecxx/Filter.cpp
new file mode 100644
index 0000000..88e49f8
--- /dev/null
+++ b/orkbasecxx/Filter.cpp
@@ -0,0 +1,143 @@
+/*
+ * 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
+ *
+ */
+#pragma warning( disable: 4786 ) // disables truncated symbols in browse-info warning
+
+#include "Filter.h"
+extern "C"
+{
+#include "g711.h"
+}
+void FilterRegistry::RegisterFilter(FilterRef& Filter) 
+{
+	m_Filters.push_back(Filter);
+}
+
+
+FilterRef FilterRegistry::GetNewFilter(AudioEncodingEnum inputEncoding, AudioEncodingEnum outputEncoding)
+{
+	for(std::list<FilterRef>::iterator it = m_Filters.begin(); it!=m_Filters.end(); it++)
+	{
+		FilterRef Filter = *it;
+
+		if(	Filter->GetInputAudioEncoding() == inputEncoding &&
+			Filter->GetOutputAudioEncoding() == outputEncoding ) 
+		{
+			return Filter->Instanciate();
+		}
+	}
+	return FilterRef();	// No filter found
+}
+
+
+FilterRef FilterRegistry::GetNewFilter(int rtpPayloadType)
+{
+	for(std::list<FilterRef>::iterator it = m_Filters.begin(); it!=m_Filters.end(); it++)
+	{
+		FilterRef Filter = *it;
+
+		if(	Filter->GetInputRtpPayloadType() == rtpPayloadType ) 
+		{
+			return Filter->Instanciate();
+		}
+	}
+	return FilterRef();	// No filter found
+}
+
+
+FilterRef FilterRegistry::GetNewFilter(CStdString& filterName)
+{
+	for(std::list<FilterRef>::iterator it = m_Filters.begin(); it!=m_Filters.end(); it++)
+	{
+		FilterRef Filter = *it;
+
+		if(	Filter->GetName().CompareNoCase(filterName) == 0 ) 
+		{
+			return Filter->Instanciate();
+		}
+	}
+	return FilterRef();	// No filter found
+}
+
+FilterRegistry* FilterRegistry::m_singleton = 0;
+
+FilterRegistry* FilterRegistry::instance()
+{
+	if(m_singleton == NULL)
+	{
+		m_singleton = new FilterRegistry();
+	}
+	return m_singleton;
+}
+
+//====================================================================
+
+int Filter::GetInputRtpPayloadType()
+{
+	// default: the filter does not accept any RTP payload type
+	return -1;
+}
+
+
+//====================================================================
+
+
+FilterRef AlawToPcmFilter::Instanciate()
+{
+	FilterRef Filter(new AlawToPcmFilter());
+	return Filter;
+}
+
+void AlawToPcmFilter::AudioChunkIn(AudioChunkRef& inputAudioChunk)
+{
+	// Create output buffer
+	m_outputAudioChunk.reset(new AudioChunk());
+	AudioChunkDetails outputDetails = *inputAudioChunk->GetDetails();	// pass through all details
+	outputDetails.m_rtpPayloadType = -1;								// and override the ones that this filter changes
+	outputDetails.m_encoding = PcmAudio;
+
+	int numSamples = inputAudioChunk->GetNumSamples();
+	short* outputBuffer = (short*)m_outputAudioChunk->CreateBuffer(numSamples*2, outputDetails);
+	char* inputBuffer = (char*)inputAudioChunk->m_pBuffer;
+	
+
+	for(int i=0; i<numSamples; i++)
+	{
+		outputBuffer[i] = (short)alaw2linear(inputBuffer[i]);
+	}
+	
+}
+
+void AlawToPcmFilter::AudioChunkOut(AudioChunkRef& chunk)
+{
+	chunk = m_outputAudioChunk;
+}
+
+AudioEncodingEnum AlawToPcmFilter::GetInputAudioEncoding()
+{
+	return AlawAudio;
+}
+
+AudioEncodingEnum AlawToPcmFilter::GetOutputAudioEncoding()
+{
+	return PcmAudio;
+}
+
+CStdString AlawToPcmFilter::GetName()
+{
+	return "ALawToPcm";
+}
+
+int AlawToPcmFilter::GetInputRtpPayloadType()
+{
+	return 0x8;
+}
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