int MpdSipxPcmu::decode(const MpRtpBufPtr &pPacket,
unsigned decodedBufferLength,// has always sufficient size
MpAudioSample *samplesBuffer,
UtlBoolean bIsPLCFrame)
{
if (!pPacket.isValid())
return 0;
unsigned payloadSize = pPacket->getPayloadSize();
unsigned maxPayloadSize = smCodecInfo.getMaxPacketBits()/8;
assert(payloadSize <= maxPayloadSize);
if (payloadSize > maxPayloadSize)
{
return 0;
}
int sampleCount = pPacket->getPayloadSize(); // number of samples to decode
G711U_Decoder(sampleCount,
(const uint8_t*)pPacket->getDataPtr(),
samplesBuffer);
return sampleCount;
}
int MpJitterBuffer::ReceivePacket(JB_uchar* RTPpacket, JB_size RTPlength, JB_ulong TS)
{
int numSamples = 0;
unsigned char* pRtpData = NULL;
struct rtpHeader* pHdr = (struct rtpHeader*) RTPpacket;
int cc;
int payloadType;
int overhead;
payloadType = (pHdr->mpt) & 0x7f;
cc = (pHdr->vpxcc) & 0x0f;
overhead = sizeof(struct rtpHeader) + (cc*sizeof(int));
switch (payloadType) {
case 0: // G.711 u-Law
case 8: // G.711 a-Law
numSamples = RTPlength - overhead;;
pRtpData = RTPpacket + overhead;
break;
default:
break;
}
if (0 == numSamples)
{
return 0;
}
if (numSamples != 160)
{
if (debugCount++ < 10)
{
printf("RTPlength=%d, cc=%d, payloadType=%d\n", RTPlength,
cc, payloadType);
}
}
if (JbQWait > 0)
{
JbQWait--;
}
if (JbQueueSize == JbQCount)
{
// discard some data...
JbQOut = JbQIn + numSamples;
JbQCount -= numSamples;
}
switch (payloadType)
{
case 0: // G.711 u-Law
G711U_Decoder(numSamples, pRtpData, JbQ+JbQIn);
break;
case 8: // G.711 a-Law
G711A_Decoder(numSamples, pRtpData, JbQ+JbQIn);
break;
default:
break;
}
JbQCount += numSamples;
JbQIn += numSamples;
if (JbQIn >= JbQueueSize)
{
JbQIn -= JbQueueSize;
}
return 0;
}
