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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
*
*/
#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;
}
//====================================================================
FilterRef UlawToPcmFilter::Instanciate()
{
FilterRef Filter(new UlawToPcmFilter());
return Filter;
}
void UlawToPcmFilter::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)ulaw2linear(inputBuffer[i]);
}
}
void UlawToPcmFilter::AudioChunkOut(AudioChunkRef& chunk)
{
chunk = m_outputAudioChunk;
}
AudioEncodingEnum UlawToPcmFilter::GetInputAudioEncoding()
{
return UlawAudio;
}
AudioEncodingEnum UlawToPcmFilter::GetOutputAudioEncoding()
{
return PcmAudio;
}
CStdString UlawToPcmFilter::GetName()
{
return "UlawToPcm";
}
int UlawToPcmFilter::GetInputRtpPayloadType()
{
return 0x0;
}
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