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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
#define _WINSOCKAPI_ // prevents the inclusion of winsock.h
#include "AudioGain.h"
#include "ConfigManager.h"
AudioGainFilter::AudioGainFilter()
{
m_log = Logger::getLogger("audiogain");
m_numEncodingErrors = 0;
LOG4CXX_DEBUG(this->m_log, "Initialized AudioGain filter");
}
AudioGainFilter::~AudioGainFilter()
{
if(m_numEncodingErrors > 0)
{
CStdString logMsg;
logMsg.Format("Encoding error happened %d time(s)", m_numEncodingErrors);
LOG4CXX_WARN(m_log, logMsg);
}
LOG4CXX_DEBUG(this->m_log, "Decommissioned AudioGain filter");
}
FilterRef AudioGainFilter::Instanciate()
{
FilterRef Filter(new AudioGainFilter());
return Filter;
}
void AudioGainFilter::AudioChunkIn(AudioChunkRef& inputAudioChunk)
{
int r_samples = 0;
int i = 0;
AudioChunkDetails outputDetails;
m_outputAudioChunk.reset();
if(inputAudioChunk.get() == NULL) {
return;
}
if(inputAudioChunk->GetNumSamples() == 0) {
return;
}
outputDetails = *inputAudioChunk->GetDetails();
r_samples = inputAudioChunk->GetNumSamples();
m_outputAudioChunk.reset(new AudioChunk());
if(inputAudioChunk->GetEncoding() != PcmAudio)
{
if(m_numEncodingErrors == 0)
{
CStdString logMsg;
logMsg.Format("Unexpected encoding:%d expected:%d (PcmAudio), gain not applied", inputAudioChunk->GetEncoding(), PcmAudio);
LOG4CXX_WARN(m_log, logMsg);
}
m_numEncodingErrors++;
m_outputAudioChunk->SetBuffer(inputAudioChunk->m_pBuffer, outputDetails);
return;
}
short* outputBuffer = (short*)m_outputAudioChunk->CreateBuffer(outputDetails);
short* inputBuffer = (short*)inputAudioChunk->m_pBuffer;
int sample = 0;
double multiplier, multiplier1, multiplier2;
multiplier = 0.0;
multiplier1 = 0.0;
multiplier2 = 0.0;
multiplier = pow(10, (CONFIG.m_audioGainDb / 20.0));
multiplier1 = pow(10, (CONFIG.m_audioGainChannel1Db / 20.0));
multiplier2 = pow(10, (CONFIG.m_audioGainChannel2Db / 20.0));
for(i = 0; i < r_samples; i++) {
sample = inputBuffer[i];
if(CONFIG.m_audioGainDb != 0)
{
sample = sample * multiplier;
}
if(CONFIG.m_audioGainChannel1Db != 0)
{
if(outputDetails.m_channel == 1)
{
sample = sample * multiplier1;
}
}
if(CONFIG.m_audioGainChannel2Db != 0)
{
if(outputDetails.m_channel == 2)
{
sample = sample * multiplier2;
}
}
if(sample < -32768)
{
sample = -32768;
}
if(sample > 32767)
{
sample = 32767;
}
outputBuffer[i] = sample;
}
}
void AudioGainFilter::AudioChunkOut(AudioChunkRef& chunk)
{
chunk = m_outputAudioChunk;
}
AudioEncodingEnum AudioGainFilter::GetInputAudioEncoding()
{
return PcmAudio;
}
AudioEncodingEnum AudioGainFilter::GetOutputAudioEncoding()
{
return PcmAudio;
}
CStdString AudioGainFilter::GetName()
{
return "AudioGain";
}
int AudioGainFilter::GetInputRtpPayloadType()
{
return -1;
}
void AudioGainFilter::CaptureEventIn(CaptureEventRef& event)
{
;
}
void AudioGainFilter::CaptureEventOut(CaptureEventRef& event)
{
;
}
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