void UlawToPcmFilter::AudioChunkIn(AudioChunkRef& inputAudioChunk)
{
m_outputAudioChunk.reset();
if(inputAudioChunk.get() == NULL)
{
return;
}
else if(inputAudioChunk->GetNumSamples() == 0)
{
return;
}
AudioChunkDetails outputDetails = *inputAudioChunk->GetDetails();
if(SupportsInputRtpPayloadType(outputDetails.m_rtpPayloadType) == false)
{
return;
}
// Create output buffer
m_outputAudioChunk.reset(new AudioChunk());
outputDetails.m_rtpPayloadType = -1; // Override details that this filter changes
outputDetails.m_encoding = PcmAudio;
int numSamples = inputAudioChunk->GetNumSamples();
outputDetails.m_numBytes = numSamples*2;
short* outputBuffer = (short*)m_outputAudioChunk->CreateBuffer(outputDetails);
char* inputBuffer = (char*)inputAudioChunk->m_pBuffer;
for(int i=0; i<numSamples; i++)
{
outputBuffer[i] = (short)ulaw2linear(inputBuffer[i]);
}
}
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(SupportsInputRtpPayloadType(outputDetails.m_rtpPayloadType) == false)
{
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;
}
}
}
