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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 "IlbcFilters.h"
IlbcToPcmFilter::IlbcToPcmFilter()
{
/* Initialize iLBC decoder states */
memset(&dec30, 0, sizeof(dec30));
memset(&dec20, 0, sizeof(dec20));
initDecode(&dec30, 30, 0);
initDecode(&dec20, 20, 0);
this->s_ilbclog = Logger::getLogger("iLBC");
#if 0
LOG4CXX_INFO(this->s_ilbclog, "Initialized new iLBC decoder");
#endif
}
IlbcToPcmFilter::~IlbcToPcmFilter()
{
memset(&dec30, 0, sizeof(dec30));
memset(&dec20, 0, sizeof(dec20));
#if 0
LOG4CXX_INFO(this->s_ilbclog, "Decommissioned iLBC decoder");
#endif
}
FilterRef IlbcToPcmFilter::Instanciate()
{
FilterRef Filter(new IlbcToPcmFilter());
return Filter;
}
void IlbcToPcmFilter::AudioChunkIn(AudioChunkRef& inputAudioChunk)
{
int r_samples = 0, fs = 0, i = 0, pos = 0, o_samples = 0, j = 0;
float ilbcf[240];
m_outputAudioChunk.reset();
if(inputAudioChunk.get() == NULL) {
return;
}
if(inputAudioChunk->GetNumSamples() == 0) {
return;
}
AudioChunkDetails outputDetails = *inputAudioChunk->GetDetails();
if(outputDetails.m_rtpPayloadType != GetInputRtpPayloadType()) {
#if 0
LOG4CXX_ERROR(this->s_ilbclog, "Error, invalid payload type received");
#endif
return;
}
r_samples = inputAudioChunk->GetNumSamples();
if((r_samples % 50) && (r_samples % 38)) {
/* Strange iLBC frame that is not a multiple of 50 bytes
* (30ms frame) and neither is it a multiple of 38 bytes
* (20ms frame). We should probably log something? */
LOG4CXX_ERROR(this->s_ilbclog, "Error, received iLBC frame is not a multiple of 50 or 38!");
return;
}
if(!(r_samples % 50)) {
i = r_samples / 50;
o_samples = i * 240;
fs = 50;
#if 0
LOG4CXX_INFO(this->s_ilbclog, "Frame size is 50 bytes");
#endif
} else {
i = r_samples / 38;
o_samples = i * 160;
fs = 38;
#if 0
LOG4CXX_INFO(this->s_ilbclog, "Frame size is 38 bytes");
#endif
}
m_outputAudioChunk.reset(new AudioChunk());
outputDetails.m_rtpPayloadType = -1;
outputDetails.m_encoding = PcmAudio;
outputDetails.m_numBytes = (o_samples * 2);
short* outputBuffer = (short*)m_outputAudioChunk->CreateBuffer(outputDetails);
unsigned char* inputBuffer = (unsigned char*)inputAudioChunk->m_pBuffer;
for(i = 0; i < r_samples; i += fs) {
if((pos+((fs == 50) ? 240 : 160)) <= o_samples) {
if(fs == 50) {
iLBC_decode(ilbcf, inputBuffer+i, &dec30, 1);
for(j = 0; j < 240; j++) {
outputBuffer[pos + j] = (short)ilbcf[j];
}
pos += 240;
} else {
iLBC_decode(ilbcf, inputBuffer+i, &dec20, 1);
for(j = 0; j < 160; j++) {
outputBuffer[pos + j] = (short)ilbcf[j];
}
pos += 160;
}
} else {
/* This should ordinarily never happen.
* Log something? */
CStdString logMsg;
logMsg.Format("Strange, I ran out of space: pos=%d, o_samples=%d, r_samples=%d, i=%d, "
"(pos+((fs == 50) ? 240 : 160))=%d",
pos, o_samples, r_samples, i, (pos+((fs == 50) ? 240 : 160)));
LOG4CXX_ERROR(this->s_ilbclog, logMsg);
return;
}
}
}
void IlbcToPcmFilter::AudioChunkOut(AudioChunkRef& chunk)
{
chunk = m_outputAudioChunk;
}
AudioEncodingEnum IlbcToPcmFilter::GetInputAudioEncoding()
{
return IlbcAudio;
}
AudioEncodingEnum IlbcToPcmFilter::GetOutputAudioEncoding()
{
return PcmAudio;
}
CStdString IlbcToPcmFilter::GetName()
{
return "IlbcToPcm";
}
int IlbcToPcmFilter::GetInputRtpPayloadType()
{
/* For now, return 0x61 (97) which is Asterisk's default */
return 0x61;
}
void IlbcToPcmFilter::CaptureEventIn(CaptureEventRef& event)
{
;
}
void IlbcToPcmFilter::CaptureEventOut(CaptureEventRef& event)
{
;
}
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